1 .. SPDX-License-Identifier: GPL-2.0
2
3 The cx2341x driver
4 ==================
5
6 Memory at cx2341x chips
7 -----------------------
8
9 This section describes the cx2341x memory map and documents some of the
10 register space.
11
12 .. note:: the memory long words are little-endian ('intel format').
13
14 .. warning::
15
16 This information was figured out from searching through the memory
17 and registers, this information may not be correct and is certainly
18 not complete, and was not derived from anything more than searching
19 through the memory space with commands like:
20
21 .. code-block:: none
22
23 ivtvctl -O min=0x02000000,max=0x020000ff
24
25 So take this as is, I'm always searching for more stuff, it's a large
26 register space :-).
27
28 Memory Map
29 ~~~~~~~~~~
30
31 The cx2341x exposes its entire 64M memory space to the PCI host via the PCI BAR0
32 (Base Address Register 0). The addresses here are offsets relative to the
33 address held in BAR0.
34
35 .. code-block:: none
36
37 0x00000000-0x00ffffff Encoder memory space
38 0x00000000-0x0003ffff Encode.rom
39 ???-??? MPEG buffer(s)
40 ???-??? Raw video capture buffer(s)
41 ???-??? Raw audio capture buffer(s)
42 ???-??? Display buffers (6 or 9)
43
44 0x01000000-0x01ffffff Decoder memory space
45 0x01000000-0x0103ffff Decode.rom
46 ???-??? MPEG buffers(s)
47 0x0114b000-0x0115afff Audio.rom (deprecated?)
48
49 0x02000000-0x0200ffff Register Space
50
51 Registers
52 ~~~~~~~~~
53
54 The registers occupy the 64k space starting at the 0x02000000 offset from BAR0.
55 All of these registers are 32 bits wide.
56
57 .. code-block:: none
58
59 DMA Registers 0x000-0xff:
60
61 0x00 - Control:
62 0=reset/cancel, 1=read, 2=write, 4=stop
63 0x04 - DMA status:
64 1=read busy, 2=write busy, 4=read error, 8=write error, 16=link list error
65 0x08 - pci DMA pointer for read link list
66 0x0c - pci DMA pointer for write link list
67 0x10 - read/write DMA enable:
68 1=read enable, 2=write enable
69 0x14 - always 0xffffffff, if set any lower instability occurs, 0x00 crashes
70 0x18 - ??
71 0x1c - always 0x20 or 32, smaller values slow down DMA transactions
72 0x20 - always value of 0x780a010a
73 0x24-0x3c - usually just random values???
74 0x40 - Interrupt status
75 0x44 - Write a bit here and shows up in Interrupt status 0x40
76 0x48 - Interrupt Mask
77 0x4C - always value of 0xfffdffff,
78 if changed to 0xffffffff DMA write interrupts break.
79 0x50 - always 0xffffffff
80 0x54 - always 0xffffffff (0x4c, 0x50, 0x54 seem like interrupt masks, are
81 3 processors on chip, Java ones, VPU, SPU, APU, maybe these are the
82 interrupt masks???).
83 0x60-0x7C - random values
84 0x80 - first write linked list reg, for Encoder Memory addr
85 0x84 - first write linked list reg, for pci memory addr
86 0x88 - first write linked list reg, for length of buffer in memory addr
87 (|0x80000000 or this for last link)
88 0x8c-0xdc - rest of write linked list reg, 8 sets of 3 total, DMA goes here
89 from linked list addr in reg 0x0c, firmware must push through or
90 something.
91 0xe0 - first (and only) read linked list reg, for pci memory addr
92 0xe4 - first (and only) read linked list reg, for Decoder memory addr
93 0xe8 - first (and only) read linked list reg, for length of buffer
94 0xec-0xff - Nothing seems to be in these registers, 0xec-f4 are 0x00000000.
95
96 Memory locations for Encoder Buffers 0x700-0x7ff:
97
98 These registers show offsets of memory locations pertaining to each
99 buffer area used for encoding, have to shift them by <<1 first.
100
101 - 0x07F8: Encoder SDRAM refresh
102 - 0x07FC: Encoder SDRAM pre-charge
103
104 Memory locations for Decoder Buffers 0x800-0x8ff:
105
106 These registers show offsets of memory locations pertaining to each
107 buffer area used for decoding, have to shift them by <<1 first.
108
109 - 0x08F8: Decoder SDRAM refresh
110 - 0x08FC: Decoder SDRAM pre-charge
111
112 Other memory locations:
113
114 - 0x2800: Video Display Module control
115 - 0x2D00: AO (audio output?) control
116 - 0x2D24: Bytes Flushed
117 - 0x7000: LSB I2C write clock bit (inverted)
118 - 0x7004: LSB I2C write data bit (inverted)
119 - 0x7008: LSB I2C read clock bit
120 - 0x700c: LSB I2C read data bit
121 - 0x9008: GPIO get input state
122 - 0x900c: GPIO set output state
123 - 0x9020: GPIO direction (Bit7 (GPIO 0..7) - 0:input, 1:output)
124 - 0x9050: SPU control
125 - 0x9054: Reset HW blocks
126 - 0x9058: VPU control
127 - 0xA018: Bit6: interrupt pending?
128 - 0xA064: APU command
129
130
131 Interrupt Status Register
132 ~~~~~~~~~~~~~~~~~~~~~~~~~
133
134 The definition of the bits in the interrupt status register 0x0040, and the
135 interrupt mask 0x0048. If a bit is cleared in the mask, then we want our ISR to
136 execute.
137
138 - bit 31 Encoder Start Capture
139 - bit 30 Encoder EOS
140 - bit 29 Encoder VBI capture
141 - bit 28 Encoder Video Input Module reset event
142 - bit 27 Encoder DMA complete
143 - bit 24 Decoder audio mode change detection event (through event notification)
144 - bit 22 Decoder data request
145 - bit 20 Decoder DMA complete
146 - bit 19 Decoder VBI re-insertion
147 - bit 18 Decoder DMA err (linked-list bad)
148
149 Missing documentation
150 ---------------------
151
152 - Encoder API post(?)
153 - Decoder API post(?)
154 - Decoder VTRACE event
155
156
157 The cx2341x firmware upload
158 ---------------------------
159
160 This document describes how to upload the cx2341x firmware to the card.
161
162 How to find
163 ~~~~~~~~~~~
164
165 See the web pages of the various projects that uses this chip for information
166 on how to obtain the firmware.
167
168 The firmware stored in a Windows driver can be detected as follows:
169
170 - Each firmware image is 256k bytes.
171 - The 1st 32-bit word of the Encoder image is 0x0000da7
172 - The 1st 32-bit word of the Decoder image is 0x00003a7
173 - The 2nd 32-bit word of both images is 0xaa55bb66
174
175 How to load
176 ~~~~~~~~~~~
177
178 - Issue the FWapi command to stop the encoder if it is running. Wait for the
179 command to complete.
180 - Issue the FWapi command to stop the decoder if it is running. Wait for the
181 command to complete.
182 - Issue the I2C command to the digitizer to stop emitting VSYNC events.
183 - Issue the FWapi command to halt the encoder's firmware.
184 - Sleep for 10ms.
185 - Issue the FWapi command to halt the decoder's firmware.
186 - Sleep for 10ms.
187 - Write 0x00000000 to register 0x2800 to stop the Video Display Module.
188 - Write 0x00000005 to register 0x2D00 to stop the AO (audio output?).
189 - Write 0x00000000 to register 0xA064 to ping? the APU.
190 - Write 0xFFFFFFFE to register 0x9058 to stop the VPU.
191 - Write 0xFFFFFFFF to register 0x9054 to reset the HW blocks.
192 - Write 0x00000001 to register 0x9050 to stop the SPU.
193 - Sleep for 10ms.
194 - Write 0x0000001A to register 0x07FC to init the Encoder SDRAM's pre-charge.
195 - Write 0x80000640 to register 0x07F8 to init the Encoder SDRAM's refresh to 1us.
196 - Write 0x0000001A to register 0x08FC to init the Decoder SDRAM's pre-charge.
197 - Write 0x80000640 to register 0x08F8 to init the Decoder SDRAM's refresh to 1us.
198 - Sleep for 512ms. (600ms is recommended)
199 - Transfer the encoder's firmware image to offset 0 in Encoder memory space.
200 - Transfer the decoder's firmware image to offset 0 in Decoder memory space.
201 - Use a read-modify-write operation to Clear bit 0 of register 0x9050 to
202 re-enable the SPU.
203 - Sleep for 1 second.
204 - Use a read-modify-write operation to Clear bits 3 and 0 of register 0x9058
205 to re-enable the VPU.
206 - Sleep for 1 second.
207 - Issue status API commands to both firmware images to verify.
208
209
210 How to call the firmware API
211 ----------------------------
212
213 The preferred calling convention is known as the firmware mailbox. The
214 mailboxes are basically a fixed length array that serves as the call-stack.
215
216 Firmware mailboxes can be located by searching the encoder and decoder memory
217 for a 16 byte signature. That signature will be located on a 256-byte boundary.
218
219 Signature:
220
221 .. code-block:: none
222
223 0x78, 0x56, 0x34, 0x12, 0x12, 0x78, 0x56, 0x34,
224 0x34, 0x12, 0x78, 0x56, 0x56, 0x34, 0x12, 0x78
225
226 The firmware implements 20 mailboxes of 20 32-bit words. The first 10 are
227 reserved for API calls. The second 10 are used by the firmware for event
228 notification.
229
230 ====== =================
231 Index Name
232 ====== =================
233 0 Flags
234 1 Command
235 2 Return value
236 3 Timeout
237 4-19 Parameter/Result
238 ====== =================
239
240
241 The flags are defined in the following table. The direction is from the
242 perspective of the firmware.
243
244 ==== ========== ============================================
245 Bit Direction Purpose
246 ==== ========== ============================================
247 2 O Firmware has processed the command.
248 1 I Driver has finished setting the parameters.
249 0 I Driver is using this mailbox.
250 ==== ========== ============================================
251
252 The command is a 32-bit enumerator. The API specifics may be found in this
253 chapter.
254
255 The return value is a 32-bit enumerator. Only two values are currently defined:
256
257 - 0=success
258 - -1=command undefined.
259
260 There are 16 parameters/results 32-bit fields. The driver populates these fields
261 with values for all the parameters required by the call. The driver overwrites
262 these fields with result values returned by the call.
263
264 The timeout value protects the card from a hung driver thread. If the driver
265 doesn't handle the completed call within the timeout specified, the firmware
266 will reset that mailbox.
267
268 To make an API call, the driver iterates over each mailbox looking for the
269 first one available (bit 0 has been cleared). The driver sets that bit, fills
270 in the command enumerator, the timeout value and any required parameters. The
271 driver then sets the parameter ready bit (bit 1). The firmware scans the
272 mailboxes for pending commands, processes them, sets the result code, populates
273 the result value array with that call's return values and sets the call
274 complete bit (bit 2). Once bit 2 is set, the driver should retrieve the results
275 and clear all the flags. If the driver does not perform this task within the
276 time set in the timeout register, the firmware will reset that mailbox.
277
278 Event notifications are sent from the firmware to the host. The host tells the
279 firmware which events it is interested in via an API call. That call tells the
280 firmware which notification mailbox to use. The firmware signals the host via
281 an interrupt. Only the 16 Results fields are used, the Flags, Command, Return
282 value and Timeout words are not used.
283
284
285 OSD firmware API description
286 ----------------------------
287
288 .. note:: this API is part of the decoder firmware, so it's cx23415 only.
289
290
291
292 CX2341X_OSD_GET_FRAMEBUFFER
293 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
294
295 Enum: 65/0x41
296
297 Description
298 ^^^^^^^^^^^
299
300 Return base and length of contiguous OSD memory.
301
302 Result[0]
303 ^^^^^^^^^
304
305 OSD base address
306
307 Result[1]
308 ^^^^^^^^^
309
310 OSD length
311
312
313
314 CX2341X_OSD_GET_PIXEL_FORMAT
315 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
316
317 Enum: 66/0x42
318
319 Description
320 ^^^^^^^^^^^
321
322 Query OSD format
323
324 Result[0]
325 ^^^^^^^^^
326
327 0=8bit index
328 1=16bit RGB 5:6:5
329 2=16bit ARGB 1:5:5:5
330 3=16bit ARGB 1:4:4:4
331 4=32bit ARGB 8:8:8:8
332
333
334
335 CX2341X_OSD_SET_PIXEL_FORMAT
336 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
337
338 Enum: 67/0x43
339
340 Description
341 ^^^^^^^^^^^
342
343 Assign pixel format
344
345 Param[0]
346 ^^^^^^^^
347
348 - 0=8bit index
349 - 1=16bit RGB 5:6:5
350 - 2=16bit ARGB 1:5:5:5
351 - 3=16bit ARGB 1:4:4:4
352 - 4=32bit ARGB 8:8:8:8
353
354
355
356 CX2341X_OSD_GET_STATE
357 ~~~~~~~~~~~~~~~~~~~~~
358
359 Enum: 68/0x44
360
361 Description
362 ^^^^^^^^^^^
363
364 Query OSD state
365
366 Result[0]
367 ^^^^^^^^^
368
369 - Bit 0 0=off, 1=on
370 - Bits 1:2 alpha control
371 - Bits 3:5 pixel format
372
373
374
375 CX2341X_OSD_SET_STATE
376 ~~~~~~~~~~~~~~~~~~~~~
377
378 Enum: 69/0x45
379
380 Description
381 ^^^^^^^^^^^
382
383 OSD switch
384
385 Param[0]
386 ^^^^^^^^
387
388 0=off, 1=on
389
390
391
392 CX2341X_OSD_GET_OSD_COORDS
393 ~~~~~~~~~~~~~~~~~~~~~~~~~~
394
395 Enum: 70/0x46
396
397 Description
398 ^^^^^^^^^^^
399
400 Retrieve coordinates of OSD area blended with video
401
402 Result[0]
403 ^^^^^^^^^
404
405 OSD buffer address
406
407 Result[1]
408 ^^^^^^^^^
409
410 Stride in pixels
411
412 Result[2]
413 ^^^^^^^^^
414
415 Lines in OSD buffer
416
417 Result[3]
418 ^^^^^^^^^
419
420 Horizontal offset in buffer
421
422 Result[4]
423 ^^^^^^^^^
424
425 Vertical offset in buffer
426
427
428
429 CX2341X_OSD_SET_OSD_COORDS
430 ~~~~~~~~~~~~~~~~~~~~~~~~~~
431
432 Enum: 71/0x47
433
434 Description
435 ^^^^^^^^^^^
436
437 Assign the coordinates of the OSD area to blend with video
438
439 Param[0]
440 ^^^^^^^^
441
442 buffer address
443
444 Param[1]
445 ^^^^^^^^
446
447 buffer stride in pixels
448
449 Param[2]
450 ^^^^^^^^
451
452 lines in buffer
453
454 Param[3]
455 ^^^^^^^^
456
457 horizontal offset
458
459 Param[4]
460 ^^^^^^^^
461
462 vertical offset
463
464
465
466 CX2341X_OSD_GET_SCREEN_COORDS
467 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
468
469 Enum: 72/0x48
470
471 Description
472 ^^^^^^^^^^^
473
474 Retrieve OSD screen area coordinates
475
476 Result[0]
477 ^^^^^^^^^
478
479 top left horizontal offset
480
481 Result[1]
482 ^^^^^^^^^
483
484 top left vertical offset
485
486 Result[2]
487 ^^^^^^^^^
488
489 bottom right horizontal offset
490
491 Result[3]
492 ^^^^^^^^^
493
494 bottom right vertical offset
495
496
497
498 CX2341X_OSD_SET_SCREEN_COORDS
499 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
500
501 Enum: 73/0x49
502
503 Description
504 ^^^^^^^^^^^
505
506 Assign the coordinates of the screen area to blend with video
507
508 Param[0]
509 ^^^^^^^^
510
511 top left horizontal offset
512
513 Param[1]
514 ^^^^^^^^
515
516 top left vertical offset
517
518 Param[2]
519 ^^^^^^^^
520
521 bottom left horizontal offset
522
523 Param[3]
524 ^^^^^^^^
525
526 bottom left vertical offset
527
528
529
530 CX2341X_OSD_GET_GLOBAL_ALPHA
531 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
532
533 Enum: 74/0x4A
534
535 Description
536 ^^^^^^^^^^^
537
538 Retrieve OSD global alpha
539
540 Result[0]
541 ^^^^^^^^^
542
543 global alpha: 0=off, 1=on
544
545 Result[1]
546 ^^^^^^^^^
547
548 bits 0:7 global alpha
549
550
551
552 CX2341X_OSD_SET_GLOBAL_ALPHA
553 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
554
555 Enum: 75/0x4B
556
557 Description
558 ^^^^^^^^^^^
559
560 Update global alpha
561
562 Param[0]
563 ^^^^^^^^
564
565 global alpha: 0=off, 1=on
566
567 Param[1]
568 ^^^^^^^^
569
570 global alpha (8 bits)
571
572 Param[2]
573 ^^^^^^^^
574
575 local alpha: 0=on, 1=off
576
577
578
579 CX2341X_OSD_SET_BLEND_COORDS
580 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
581
582 Enum: 78/0x4C
583
584 Description
585 ^^^^^^^^^^^
586
587 Move start of blending area within display buffer
588
589 Param[0]
590 ^^^^^^^^
591
592 horizontal offset in buffer
593
594 Param[1]
595 ^^^^^^^^
596
597 vertical offset in buffer
598
599
600
601 CX2341X_OSD_GET_FLICKER_STATE
602 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
603
604 Enum: 79/0x4F
605
606 Description
607 ^^^^^^^^^^^
608
609 Retrieve flicker reduction module state
610
611 Result[0]
612 ^^^^^^^^^
613
614 flicker state: 0=off, 1=on
615
616
617
618 CX2341X_OSD_SET_FLICKER_STATE
619 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
620
621 Enum: 80/0x50
622
623 Description
624 ^^^^^^^^^^^
625
626 Set flicker reduction module state
627
628 Param[0]
629 ^^^^^^^^
630
631 State: 0=off, 1=on
632
633
634
635 CX2341X_OSD_BLT_COPY
636 ~~~~~~~~~~~~~~~~~~~~
637
638 Enum: 82/0x52
639
640 Description
641 ^^^^^^^^^^^
642
643 BLT copy
644
645 Param[0]
646 ^^^^^^^^
647
648 .. code-block:: none
649
650 '0000' zero
651 '0001' ~destination AND ~source
652 '0010' ~destination AND source
653 '0011' ~destination
654 '0100' destination AND ~source
655 '0101' ~source
656 '0110' destination XOR source
657 '0111' ~destination OR ~source
658 '1000' ~destination AND ~source
659 '1001' destination XNOR source
660 '1010' source
661 '1011' ~destination OR source
662 '1100' destination
663 '1101' destination OR ~source
664 '1110' destination OR source
665 '1111' one
666
667
668 Param[1]
669 ^^^^^^^^
670
671 Resulting alpha blending
672
673 - '01' source_alpha
674 - '10' destination_alpha
675 - '11' source_alpha*destination_alpha+1
676 (zero if both source and destination alpha are zero)
677
678 Param[2]
679 ^^^^^^^^
680
681 .. code-block:: none
682
683 '00' output_pixel = source_pixel
684
685 '01' if source_alpha=0:
686 output_pixel = destination_pixel
687 if 256 > source_alpha > 1:
688 output_pixel = ((source_alpha + 1)*source_pixel +
689 (255 - source_alpha)*destination_pixel)/256
690
691 '10' if destination_alpha=0:
692 output_pixel = source_pixel
693 if 255 > destination_alpha > 0:
694 output_pixel = ((255 - destination_alpha)*source_pixel +
695 (destination_alpha + 1)*destination_pixel)/256
696
697 '11' if source_alpha=0:
698 source_temp = 0
699 if source_alpha=255:
700 source_temp = source_pixel*256
701 if 255 > source_alpha > 0:
702 source_temp = source_pixel*(source_alpha + 1)
703 if destination_alpha=0:
704 destination_temp = 0
705 if destination_alpha=255:
706 destination_temp = destination_pixel*256
707 if 255 > destination_alpha > 0:
708 destination_temp = destination_pixel*(destination_alpha + 1)
709 output_pixel = (source_temp + destination_temp)/256
710
711 Param[3]
712 ^^^^^^^^
713
714 width
715
716 Param[4]
717 ^^^^^^^^
718
719 height
720
721 Param[5]
722 ^^^^^^^^
723
724 destination pixel mask
725
726 Param[6]
727 ^^^^^^^^
728
729 destination rectangle start address
730
731 Param[7]
732 ^^^^^^^^
733
734 destination stride in dwords
735
736 Param[8]
737 ^^^^^^^^
738
739 source stride in dwords
740
741 Param[9]
742 ^^^^^^^^
743
744 source rectangle start address
745
746
747
748 CX2341X_OSD_BLT_FILL
749 ~~~~~~~~~~~~~~~~~~~~
750
751 Enum: 83/0x53
752
753 Description
754 ^^^^^^^^^^^
755
756 BLT fill color
757
758 Param[0]
759 ^^^^^^^^
760
761 Same as Param[0] on API 0x52
762
763 Param[1]
764 ^^^^^^^^
765
766 Same as Param[1] on API 0x52
767
768 Param[2]
769 ^^^^^^^^
770
771 Same as Param[2] on API 0x52
772
773 Param[3]
774 ^^^^^^^^
775
776 width
777
778 Param[4]
779 ^^^^^^^^
780
781 height
782
783 Param[5]
784 ^^^^^^^^
785
786 destination pixel mask
787
788 Param[6]
789 ^^^^^^^^
790
791 destination rectangle start address
792
793 Param[7]
794 ^^^^^^^^
795
796 destination stride in dwords
797
798 Param[8]
799 ^^^^^^^^
800
801 color fill value
802
803
804
805 CX2341X_OSD_BLT_TEXT
806 ~~~~~~~~~~~~~~~~~~~~
807
808 Enum: 84/0x54
809
810 Description
811 ^^^^^^^^^^^
812
813 BLT for 8 bit alpha text source
814
815 Param[0]
816 ^^^^^^^^
817
818 Same as Param[0] on API 0x52
819
820 Param[1]
821 ^^^^^^^^
822
823 Same as Param[1] on API 0x52
824
825 Param[2]
826 ^^^^^^^^
827
828 Same as Param[2] on API 0x52
829
830 Param[3]
831 ^^^^^^^^
832
833 width
834
835 Param[4]
836 ^^^^^^^^
837
838 height
839
840 Param[5]
841 ^^^^^^^^
842
843 destination pixel mask
844
845 Param[6]
846 ^^^^^^^^
847
848 destination rectangle start address
849
850 Param[7]
851 ^^^^^^^^
852
853 destination stride in dwords
854
855 Param[8]
856 ^^^^^^^^
857
858 source stride in dwords
859
860 Param[9]
861 ^^^^^^^^
862
863 source rectangle start address
864
865 Param[10]
866 ^^^^^^^^^
867
868 color fill value
869
870
871
872 CX2341X_OSD_SET_FRAMEBUFFER_WINDOW
873 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
874
875 Enum: 86/0x56
876
877 Description
878 ^^^^^^^^^^^
879
880 Positions the main output window on the screen. The coordinates must be
881 such that the entire window fits on the screen.
882
883 Param[0]
884 ^^^^^^^^
885
886 window width
887
888 Param[1]
889 ^^^^^^^^
890
891 window height
892
893 Param[2]
894 ^^^^^^^^
895
896 top left window corner horizontal offset
897
898 Param[3]
899 ^^^^^^^^
900
901 top left window corner vertical offset
902
903
904
905 CX2341X_OSD_SET_CHROMA_KEY
906 ~~~~~~~~~~~~~~~~~~~~~~~~~~
907
908 Enum: 96/0x60
909
910 Description
911 ^^^^^^^^^^^
912
913 Chroma key switch and color
914
915 Param[0]
916 ^^^^^^^^
917
918 state: 0=off, 1=on
919
920 Param[1]
921 ^^^^^^^^
922
923 color
924
925
926
927 CX2341X_OSD_GET_ALPHA_CONTENT_INDEX
928 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
929
930 Enum: 97/0x61
931
932 Description
933 ^^^^^^^^^^^
934
935 Retrieve alpha content index
936
937 Result[0]
938 ^^^^^^^^^
939
940 alpha content index, Range 0:15
941
942
943
944 CX2341X_OSD_SET_ALPHA_CONTENT_INDEX
945 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
946
947 Enum: 98/0x62
948
949 Description
950 ^^^^^^^^^^^
951
952 Assign alpha content index
953
954 Param[0]
955 ^^^^^^^^
956
957 alpha content index, range 0:15
958
959
960 Encoder firmware API description
961 --------------------------------
962
963 CX2341X_ENC_PING_FW
964 ~~~~~~~~~~~~~~~~~~~
965
966 Enum: 128/0x80
967
968 Description
969 ^^^^^^^^^^^
970
971 Does nothing. Can be used to check if the firmware is responding.
972
973
974
975 CX2341X_ENC_START_CAPTURE
976 ~~~~~~~~~~~~~~~~~~~~~~~~~
977
978 Enum: 129/0x81
979
980 Description
981 ^^^^^^^^^^^
982
983 Commences the capture of video, audio and/or VBI data. All encoding
984 parameters must be initialized prior to this API call. Captures frames
985 continuously or until a predefined number of frames have been captured.
986
987 Param[0]
988 ^^^^^^^^
989
990 Capture stream type:
991
992 - 0=MPEG
993 - 1=Raw
994 - 2=Raw passthrough
995 - 3=VBI
996
997
998 Param[1]
999 ^^^^^^^^
1000
1001 Bitmask:
1002
1003 - Bit 0 when set, captures YUV
1004 - Bit 1 when set, captures PCM audio
1005 - Bit 2 when set, captures VBI (same as param[0]=3)
1006 - Bit 3 when set, the capture destination is the decoder
1007 (same as param[0]=2)
1008 - Bit 4 when set, the capture destination is the host
1009
1010 .. note:: this parameter is only meaningful for RAW capture type.
1011
1012
1013
1014 CX2341X_ENC_STOP_CAPTURE
1015 ~~~~~~~~~~~~~~~~~~~~~~~~
1016
1017 Enum: 130/0x82
1018
1019 Description
1020 ^^^^^^^^^^^
1021
1022 Ends a capture in progress
1023
1024 Param[0]
1025 ^^^^^^^^
1026
1027 - 0=stop at end of GOP (generates IRQ)
1028 - 1=stop immediate (no IRQ)
1029
1030 Param[1]
1031 ^^^^^^^^
1032
1033 Stream type to stop, see param[0] of API 0x81
1034
1035 Param[2]
1036 ^^^^^^^^
1037
1038 Subtype, see param[1] of API 0x81
1039
1040
1041
1042 CX2341X_ENC_SET_AUDIO_ID
1043 ~~~~~~~~~~~~~~~~~~~~~~~~
1044
1045 Enum: 137/0x89
1046
1047 Description
1048 ^^^^^^^^^^^
1049
1050 Assigns the transport stream ID of the encoded audio stream
1051
1052 Param[0]
1053 ^^^^^^^^
1054
1055 Audio Stream ID
1056
1057
1058
1059 CX2341X_ENC_SET_VIDEO_ID
1060 ~~~~~~~~~~~~~~~~~~~~~~~~
1061
1062 Enum: 139/0x8B
1063
1064 Description
1065 ^^^^^^^^^^^
1066
1067 Set video transport stream ID
1068
1069 Param[0]
1070 ^^^^^^^^
1071
1072 Video stream ID
1073
1074
1075
1076 CX2341X_ENC_SET_PCR_ID
1077 ~~~~~~~~~~~~~~~~~~~~~~
1078
1079 Enum: 141/0x8D
1080
1081 Description
1082 ^^^^^^^^^^^
1083
1084 Assigns the transport stream ID for PCR packets
1085
1086 Param[0]
1087 ^^^^^^^^
1088
1089 PCR Stream ID
1090
1091
1092
1093 CX2341X_ENC_SET_FRAME_RATE
1094 ~~~~~~~~~~~~~~~~~~~~~~~~~~
1095
1096 Enum: 143/0x8F
1097
1098 Description
1099 ^^^^^^^^^^^
1100
1101 Set video frames per second. Change occurs at start of new GOP.
1102
1103 Param[0]
1104 ^^^^^^^^
1105
1106 - 0=30fps
1107 - 1=25fps
1108
1109
1110
1111 CX2341X_ENC_SET_FRAME_SIZE
1112 ~~~~~~~~~~~~~~~~~~~~~~~~~~
1113
1114 Enum: 145/0x91
1115
1116 Description
1117 ^^^^^^^^^^^
1118
1119 Select video stream encoding resolution.
1120
1121 Param[0]
1122 ^^^^^^^^
1123
1124 Height in lines. Default 480
1125
1126 Param[1]
1127 ^^^^^^^^
1128
1129 Width in pixels. Default 720
1130
1131
1132
1133 CX2341X_ENC_SET_BIT_RATE
1134 ~~~~~~~~~~~~~~~~~~~~~~~~
1135
1136 Enum: 149/0x95
1137
1138 Description
1139 ^^^^^^^^^^^
1140
1141 Assign average video stream bitrate.
1142
1143 Param[0]
1144 ^^^^^^^^
1145
1146 0=variable bitrate, 1=constant bitrate
1147
1148 Param[1]
1149 ^^^^^^^^
1150
1151 bitrate in bits per second
1152
1153 Param[2]
1154 ^^^^^^^^
1155
1156 peak bitrate in bits per second, divided by 400
1157
1158 Param[3]
1159 ^^^^^^^^
1160
1161 Mux bitrate in bits per second, divided by 400. May be 0 (default).
1162
1163 Param[4]
1164 ^^^^^^^^
1165
1166 Rate Control VBR Padding
1167
1168 Param[5]
1169 ^^^^^^^^
1170
1171 VBV Buffer used by encoder
1172
1173 .. note::
1174
1175 #) Param\[3\] and Param\[4\] seem to be always 0
1176 #) Param\[5\] doesn't seem to be used.
1177
1178
1179
1180 CX2341X_ENC_SET_GOP_PROPERTIES
1181 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1182
1183 Enum: 151/0x97
1184
1185 Description
1186 ^^^^^^^^^^^
1187
1188 Setup the GOP structure
1189
1190 Param[0]
1191 ^^^^^^^^
1192
1193 GOP size (maximum is 34)
1194
1195 Param[1]
1196 ^^^^^^^^
1197
1198 Number of B frames between the I and P frame, plus 1.
1199 For example: IBBPBBPBBPBB --> GOP size: 12, number of B frames: 2+1 = 3
1200
1201 .. note::
1202
1203 GOP size must be a multiple of (B-frames + 1).
1204
1205
1206
1207 CX2341X_ENC_SET_ASPECT_RATIO
1208 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1209
1210 Enum: 153/0x99
1211
1212 Description
1213 ^^^^^^^^^^^
1214
1215 Sets the encoding aspect ratio. Changes in the aspect ratio take effect
1216 at the start of the next GOP.
1217
1218 Param[0]
1219 ^^^^^^^^
1220
1221 - '0000' forbidden
1222 - '0001' 1:1 square
1223 - '0010' 4:3
1224 - '0011' 16:9
1225 - '0100' 2.21:1
1226 - '0101' to '1111' reserved
1227
1228
1229
1230 CX2341X_ENC_SET_DNR_FILTER_MODE
1231 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1232
1233 Enum: 155/0x9B
1234
1235 Description
1236 ^^^^^^^^^^^
1237
1238 Assign Dynamic Noise Reduction operating mode
1239
1240 Param[0]
1241 ^^^^^^^^
1242
1243 Bit0: Spatial filter, set=auto, clear=manual
1244 Bit1: Temporal filter, set=auto, clear=manual
1245
1246 Param[1]
1247 ^^^^^^^^
1248
1249 Median filter:
1250
1251 - 0=Disabled
1252 - 1=Horizontal
1253 - 2=Vertical
1254 - 3=Horiz/Vert
1255 - 4=Diagonal
1256
1257
1258
1259 CX2341X_ENC_SET_DNR_FILTER_PROPS
1260 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1261
1262 Enum: 157/0x9D
1263
1264 Description
1265 ^^^^^^^^^^^
1266
1267 These Dynamic Noise Reduction filter values are only meaningful when
1268 the respective filter is set to "manual" (See API 0x9B)
1269
1270 Param[0]
1271 ^^^^^^^^
1272
1273 Spatial filter: default 0, range 0:15
1274
1275 Param[1]
1276 ^^^^^^^^
1277
1278 Temporal filter: default 0, range 0:31
1279
1280
1281
1282 CX2341X_ENC_SET_CORING_LEVELS
1283 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1284
1285 Enum: 159/0x9F
1286
1287 Description
1288 ^^^^^^^^^^^
1289
1290 Assign Dynamic Noise Reduction median filter properties.
1291
1292 Param[0]
1293 ^^^^^^^^
1294
1295 Threshold above which the luminance median filter is enabled.
1296 Default: 0, range 0:255
1297
1298 Param[1]
1299 ^^^^^^^^
1300
1301 Threshold below which the luminance median filter is enabled.
1302 Default: 255, range 0:255
1303
1304 Param[2]
1305 ^^^^^^^^
1306
1307 Threshold above which the chrominance median filter is enabled.
1308 Default: 0, range 0:255
1309
1310 Param[3]
1311 ^^^^^^^^
1312
1313 Threshold below which the chrominance median filter is enabled.
1314 Default: 255, range 0:255
1315
1316
1317
1318 CX2341X_ENC_SET_SPATIAL_FILTER_TYPE
1319 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1320
1321 Enum: 161/0xA1
1322
1323 Description
1324 ^^^^^^^^^^^
1325
1326 Assign spatial prefilter parameters
1327
1328 Param[0]
1329 ^^^^^^^^
1330
1331 Luminance filter
1332
1333 - 0=Off
1334 - 1=1D Horizontal
1335 - 2=1D Vertical
1336 - 3=2D H/V Separable (default)
1337 - 4=2D Symmetric non-separable
1338
1339 Param[1]
1340 ^^^^^^^^
1341
1342 Chrominance filter
1343
1344 - 0=Off
1345 - 1=1D Horizontal (default)
1346
1347
1348
1349 CX2341X_ENC_SET_VBI_LINE
1350 ~~~~~~~~~~~~~~~~~~~~~~~~
1351
1352 Enum: 183/0xB7
1353
1354 Description
1355 ^^^^^^^^^^^
1356
1357 Selects VBI line number.
1358
1359 Param[0]
1360 ^^^^^^^^
1361
1362 - Bits 0:4 line number
1363 - Bit 31 0=top_field, 1=bottom_field
1364 - Bits 0:31 all set specifies "all lines"
1365
1366 Param[1]
1367 ^^^^^^^^
1368
1369 VBI line information features: 0=disabled, 1=enabled
1370
1371 Param[2]
1372 ^^^^^^^^
1373
1374 Slicing: 0=None, 1=Closed Caption
1375 Almost certainly not implemented. Set to 0.
1376
1377 Param[3]
1378 ^^^^^^^^
1379
1380 Luminance samples in this line.
1381 Almost certainly not implemented. Set to 0.
1382
1383 Param[4]
1384 ^^^^^^^^
1385
1386 Chrominance samples in this line
1387 Almost certainly not implemented. Set to 0.
1388
1389
1390
1391 CX2341X_ENC_SET_STREAM_TYPE
1392 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
1393
1394 Enum: 185/0xB9
1395
1396 Description
1397 ^^^^^^^^^^^
1398
1399 Assign stream type
1400
1401 .. note::
1402
1403 Transport stream is not working in recent firmwares.
1404 And in older firmwares the timestamps in the TS seem to be
1405 unreliable.
1406
1407 Param[0]
1408 ^^^^^^^^
1409
1410 - 0=Program stream
1411 - 1=Transport stream
1412 - 2=MPEG1 stream
1413 - 3=PES A/V stream
1414 - 5=PES Video stream
1415 - 7=PES Audio stream
1416 - 10=DVD stream
1417 - 11=VCD stream
1418 - 12=SVCD stream
1419 - 13=DVD_S1 stream
1420 - 14=DVD_S2 stream
1421
1422
1423
1424 CX2341X_ENC_SET_OUTPUT_PORT
1425 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
1426
1427 Enum: 187/0xBB
1428
1429 Description
1430 ^^^^^^^^^^^
1431
1432 Assign stream output port. Normally 0 when the data is copied through
1433 the PCI bus (DMA), and 1 when the data is streamed to another chip
1434 (pvrusb and cx88-blackbird).
1435
1436 Param[0]
1437 ^^^^^^^^
1438
1439 - 0=Memory (default)
1440 - 1=Streaming
1441 - 2=Serial
1442
1443 Param[1]
1444 ^^^^^^^^
1445
1446 Unknown, but leaving this to 0 seems to work best. Indications are that
1447 this might have to do with USB support, although passing anything but 0
1448 only breaks things.
1449
1450
1451
1452 CX2341X_ENC_SET_AUDIO_PROPERTIES
1453 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1454
1455 Enum: 189/0xBD
1456
1457 Description
1458 ^^^^^^^^^^^
1459
1460 Set audio stream properties, may be called while encoding is in progress.
1461
1462 .. note::
1463
1464 All bitfields are consistent with ISO11172 documentation except
1465 bits 2:3 which ISO docs define as:
1466
1467 - '11' Layer I
1468 - '10' Layer II
1469 - '01' Layer III
1470 - '00' Undefined
1471
1472 This discrepancy may indicate a possible error in the documentation.
1473 Testing indicated that only Layer II is actually working, and that
1474 the minimum bitrate should be 192 kbps.
1475
1476 Param[0]
1477 ^^^^^^^^
1478
1479 Bitmask:
1480
1481 .. code-block:: none
1482
1483 0:1 '00' 44.1Khz
1484 '01' 48Khz
1485 '10' 32Khz
1486 '11' reserved
1487
1488 2:3 '01'=Layer I
1489 '10'=Layer II
1490
1491 4:7 Bitrate:
1492 Index | Layer I | Layer II
1493 ------+-------------+------------
1494 '0000' | free format | free format
1495 '0001' | 32 kbit/s | 32 kbit/s
1496 '0010' | 64 kbit/s | 48 kbit/s
1497 '0011' | 96 kbit/s | 56 kbit/s
1498 '0100' | 128 kbit/s | 64 kbit/s
1499 '0101' | 160 kbit/s | 80 kbit/s
1500 '0110' | 192 kbit/s | 96 kbit/s
1501 '0111' | 224 kbit/s | 112 kbit/s
1502 '1000' | 256 kbit/s | 128 kbit/s
1503 '1001' | 288 kbit/s | 160 kbit/s
1504 '1010' | 320 kbit/s | 192 kbit/s
1505 '1011' | 352 kbit/s | 224 kbit/s
1506 '1100' | 384 kbit/s | 256 kbit/s
1507 '1101' | 416 kbit/s | 320 kbit/s
1508 '1110' | 448 kbit/s | 384 kbit/s
1509
1510 .. note::
1511
1512 For Layer II, not all combinations of total bitrate
1513 and mode are allowed. See ISO11172-3 3-Annex B,
1514 Table 3-B.2
1515
1516 8:9 '00'=Stereo
1517 '01'=JointStereo
1518 '10'=Dual
1519 '11'=Mono
1520
1521 .. note::
1522
1523 The cx23415 cannot decode Joint Stereo properly.
1524
1525 10:11 Mode Extension used in joint_stereo mode.
1526 In Layer I and II they indicate which subbands are in
1527 intensity_stereo. All other subbands are coded in stereo.
1528 '00' subbands 4-31 in intensity_stereo, bound==4
1529 '01' subbands 8-31 in intensity_stereo, bound==8
1530 '10' subbands 12-31 in intensity_stereo, bound==12
1531 '11' subbands 16-31 in intensity_stereo, bound==16
1532
1533 12:13 Emphasis:
1534 '00' None
1535 '01' 50/15uS
1536 '10' reserved
1537 '11' CCITT J.17
1538
1539 14 CRC:
1540 '0' off
1541 '1' on
1542
1543 15 Copyright:
1544 '0' off
1545 '1' on
1546
1547 16 Generation:
1548 '0' copy
1549 '1' original
1550
1551
1552
1553 CX2341X_ENC_HALT_FW
1554 ~~~~~~~~~~~~~~~~~~~
1555
1556 Enum: 195/0xC3
1557
1558 Description
1559 ^^^^^^^^^^^
1560
1561 The firmware is halted and no further API calls are serviced until the
1562 firmware is uploaded again.
1563
1564
1565
1566 CX2341X_ENC_GET_VERSION
1567 ~~~~~~~~~~~~~~~~~~~~~~~
1568
1569 Enum: 196/0xC4
1570
1571 Description
1572 ^^^^^^^^^^^
1573
1574 Returns the version of the encoder firmware.
1575
1576 Result[0]
1577 ^^^^^^^^^
1578
1579 Version bitmask:
1580 - Bits 0:15 build
1581 - Bits 16:23 minor
1582 - Bits 24:31 major
1583
1584
1585
1586 CX2341X_ENC_SET_GOP_CLOSURE
1587 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
1588
1589 Enum: 197/0xC5
1590
1591 Description
1592 ^^^^^^^^^^^
1593
1594 Assigns the GOP open/close property.
1595
1596 Param[0]
1597 ^^^^^^^^
1598
1599 - 0=Open
1600 - 1=Closed
1601
1602
1603
1604 CX2341X_ENC_GET_SEQ_END
1605 ~~~~~~~~~~~~~~~~~~~~~~~
1606
1607 Enum: 198/0xC6
1608
1609 Description
1610 ^^^^^^^^^^^
1611
1612 Obtains the sequence end code of the encoder's buffer. When a capture
1613 is started a number of interrupts are still generated, the last of
1614 which will have Result[0] set to 1 and Result[1] will contain the size
1615 of the buffer.
1616
1617 Result[0]
1618 ^^^^^^^^^
1619
1620 State of the transfer (1 if last buffer)
1621
1622 Result[1]
1623 ^^^^^^^^^
1624
1625 If Result[0] is 1, this contains the size of the last buffer, undefined
1626 otherwise.
1627
1628
1629
1630 CX2341X_ENC_SET_PGM_INDEX_INFO
1631 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1632
1633 Enum: 199/0xC7
1634
1635 Description
1636 ^^^^^^^^^^^
1637
1638 Sets the Program Index Information.
1639 The information is stored as follows:
1640
1641 .. code-block:: c
1642
1643 struct info {
1644 u32 length; // Length of this frame
1645 u32 offset_low; // Offset in the file of the
1646 u32 offset_high; // start of this frame
1647 u32 mask1; // Bits 0-2 are the type mask:
1648 // 1=I, 2=P, 4=B
1649 // 0=End of Program Index, other fields
1650 // are invalid.
1651 u32 pts; // The PTS of the frame
1652 u32 mask2; // Bit 0 is bit 32 of the pts.
1653 };
1654 u32 table_ptr;
1655 struct info index[400];
1656
1657 The table_ptr is the encoder memory address in the table were
1658 *new* entries will be written.
1659
1660 .. note:: This is a ringbuffer, so the table_ptr will wraparound.
1661
1662 Param[0]
1663 ^^^^^^^^
1664
1665 Picture Mask:
1666 - 0=No index capture
1667 - 1=I frames
1668 - 3=I,P frames
1669 - 7=I,P,B frames
1670
1671 (Seems to be ignored, it always indexes I, P and B frames)
1672
1673 Param[1]
1674 ^^^^^^^^
1675
1676 Elements requested (up to 400)
1677
1678 Result[0]
1679 ^^^^^^^^^
1680
1681 Offset in the encoder memory of the start of the table.
1682
1683 Result[1]
1684 ^^^^^^^^^
1685
1686 Number of allocated elements up to a maximum of Param[1]
1687
1688
1689
1690 CX2341X_ENC_SET_VBI_CONFIG
1691 ~~~~~~~~~~~~~~~~~~~~~~~~~~
1692
1693 Enum: 200/0xC8
1694
1695 Description
1696 ^^^^^^^^^^^
1697
1698 Configure VBI settings
1699
1700 Param[0]
1701 ^^^^^^^^
1702
1703 Bitmap:
1704
1705 .. code-block:: none
1706
1707 0 Mode '0' Sliced, '1' Raw
1708 1:3 Insertion:
1709 '000' insert in extension & user data
1710 '001' insert in private packets
1711 '010' separate stream and user data
1712 '111' separate stream and private data
1713 8:15 Stream ID (normally 0xBD)
1714
1715 Param[1]
1716 ^^^^^^^^
1717
1718 Frames per interrupt (max 8). Only valid in raw mode.
1719
1720 Param[2]
1721 ^^^^^^^^
1722
1723 Total raw VBI frames. Only valid in raw mode.
1724
1725 Param[3]
1726 ^^^^^^^^
1727
1728 Start codes
1729
1730 Param[4]
1731 ^^^^^^^^
1732
1733 Stop codes
1734
1735 Param[5]
1736 ^^^^^^^^
1737
1738 Lines per frame
1739
1740 Param[6]
1741 ^^^^^^^^
1742
1743 Byte per line
1744
1745 Result[0]
1746 ^^^^^^^^^
1747
1748 Observed frames per interrupt in raw mode only. Rage 1 to Param[1]
1749
1750 Result[1]
1751 ^^^^^^^^^
1752
1753 Observed number of frames in raw mode. Range 1 to Param[2]
1754
1755 Result[2]
1756 ^^^^^^^^^
1757
1758 Memory offset to start or raw VBI data
1759
1760
1761
1762 CX2341X_ENC_SET_DMA_BLOCK_SIZE
1763 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1764
1765 Enum: 201/0xC9
1766
1767 Description
1768 ^^^^^^^^^^^
1769
1770 Set DMA transfer block size
1771
1772 Param[0]
1773 ^^^^^^^^
1774
1775 DMA transfer block size in bytes or frames. When unit is bytes,
1776 supported block sizes are 2^7, 2^8 and 2^9 bytes.
1777
1778 Param[1]
1779 ^^^^^^^^
1780
1781 Unit: 0=bytes, 1=frames
1782
1783
1784
1785 CX2341X_ENC_GET_PREV_DMA_INFO_MB_10
1786 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1787
1788 Enum: 202/0xCA
1789
1790 Description
1791 ^^^^^^^^^^^
1792
1793 Returns information on the previous DMA transfer in conjunction with
1794 bit 27 of the interrupt mask. Uses mailbox 10.
1795
1796 Result[0]
1797 ^^^^^^^^^
1798
1799 Type of stream
1800
1801 Result[1]
1802 ^^^^^^^^^
1803
1804 Address Offset
1805
1806 Result[2]
1807 ^^^^^^^^^
1808
1809 Maximum size of transfer
1810
1811
1812
1813 CX2341X_ENC_GET_PREV_DMA_INFO_MB_9
1814 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1815
1816 Enum: 203/0xCB
1817
1818 Description
1819 ^^^^^^^^^^^
1820
1821 Returns information on the previous DMA transfer in conjunction with
1822 bit 27 or 18 of the interrupt mask. Uses mailbox 9.
1823
1824 Result[0]
1825 ^^^^^^^^^
1826
1827 Status bits:
1828 - 0 read completed
1829 - 1 write completed
1830 - 2 DMA read error
1831 - 3 DMA write error
1832 - 4 Scatter-Gather array error
1833
1834 Result[1]
1835 ^^^^^^^^^
1836
1837 DMA type
1838
1839 Result[2]
1840 ^^^^^^^^^
1841
1842 Presentation Time Stamp bits 0..31
1843
1844 Result[3]
1845 ^^^^^^^^^
1846
1847 Presentation Time Stamp bit 32
1848
1849
1850
1851 CX2341X_ENC_SCHED_DMA_TO_HOST
1852 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1853
1854 Enum: 204/0xCC
1855
1856 Description
1857 ^^^^^^^^^^^
1858
1859 Setup DMA to host operation
1860
1861 Param[0]
1862 ^^^^^^^^
1863
1864 Memory address of link list
1865
1866 Param[1]
1867 ^^^^^^^^
1868
1869 Length of link list (wtf: what units ???)
1870
1871 Param[2]
1872 ^^^^^^^^
1873
1874 DMA type (0=MPEG)
1875
1876
1877
1878 CX2341X_ENC_INITIALIZE_INPUT
1879 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1880
1881 Enum: 205/0xCD
1882
1883 Description
1884 ^^^^^^^^^^^
1885
1886 Initializes the video input
1887
1888
1889
1890 CX2341X_ENC_SET_FRAME_DROP_RATE
1891 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1892
1893 Enum: 208/0xD0
1894
1895 Description
1896 ^^^^^^^^^^^
1897
1898 For each frame captured, skip specified number of frames.
1899
1900 Param[0]
1901 ^^^^^^^^
1902
1903 Number of frames to skip
1904
1905
1906
1907 CX2341X_ENC_PAUSE_ENCODER
1908 ~~~~~~~~~~~~~~~~~~~~~~~~~
1909
1910 Enum: 210/0xD2
1911
1912 Description
1913 ^^^^^^^^^^^
1914
1915 During a pause condition, all frames are dropped instead of being encoded.
1916
1917 Param[0]
1918 ^^^^^^^^
1919
1920 - 0=Pause encoding
1921 - 1=Continue encoding
1922
1923
1924
1925 CX2341X_ENC_REFRESH_INPUT
1926 ~~~~~~~~~~~~~~~~~~~~~~~~~
1927
1928 Enum: 211/0xD3
1929
1930 Description
1931 ^^^^^^^^^^^
1932
1933 Refreshes the video input
1934
1935
1936
1937 CX2341X_ENC_SET_COPYRIGHT
1938 ~~~~~~~~~~~~~~~~~~~~~~~~~
1939
1940 Enum: 212/0xD4
1941
1942 Description
1943 ^^^^^^^^^^^
1944
1945 Sets stream copyright property
1946
1947 Param[0]
1948 ^^^^^^^^
1949
1950
1951 - 0=Stream is not copyrighted
1952 - 1=Stream is copyrighted
1953
1954
1955
1956 CX2341X_ENC_SET_EVENT_NOTIFICATION
1957 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1958
1959 Enum: 213/0xD5
1960
1961 Description
1962 ^^^^^^^^^^^
1963
1964 Setup firmware to notify the host about a particular event. Host must
1965 unmask the interrupt bit.
1966
1967 Param[0]
1968 ^^^^^^^^
1969
1970 Event (0=refresh encoder input)
1971
1972 Param[1]
1973 ^^^^^^^^
1974
1975 Notification 0=disabled 1=enabled
1976
1977 Param[2]
1978 ^^^^^^^^
1979
1980 Interrupt bit
1981
1982 Param[3]
1983 ^^^^^^^^
1984
1985 Mailbox slot, -1 if no mailbox required.
1986
1987
1988
1989 CX2341X_ENC_SET_NUM_VSYNC_LINES
1990 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1991
1992 Enum: 214/0xD6
1993
1994 Description
1995 ^^^^^^^^^^^
1996
1997 Depending on the analog video decoder used, this assigns the number
1998 of lines for field 1 and 2.
1999
2000 Param[0]
2001 ^^^^^^^^
2002
2003 Field 1 number of lines:
2004 - 0x00EF for SAA7114
2005 - 0x00F0 for SAA7115
2006 - 0x0105 for Micronas
2007
2008 Param[1]
2009 ^^^^^^^^
2010
2011 Field 2 number of lines:
2012 - 0x00EF for SAA7114
2013 - 0x00F0 for SAA7115
2014 - 0x0106 for Micronas
2015
2016
2017
2018 CX2341X_ENC_SET_PLACEHOLDER
2019 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
2020
2021 Enum: 215/0xD7
2022
2023 Description
2024 ^^^^^^^^^^^
2025
2026 Provides a mechanism of inserting custom user data in the MPEG stream.
2027
2028 Param[0]
2029 ^^^^^^^^
2030
2031 - 0=extension & user data
2032 - 1=private packet with stream ID 0xBD
2033
2034 Param[1]
2035 ^^^^^^^^
2036
2037 Rate at which to insert data, in units of frames (for private packet)
2038 or GOPs (for ext. & user data)
2039
2040 Param[2]
2041 ^^^^^^^^
2042
2043 Number of data DWORDs (below) to insert
2044
2045 Param[3]
2046 ^^^^^^^^
2047
2048 Custom data 0
2049
2050 Param[4]
2051 ^^^^^^^^
2052
2053 Custom data 1
2054
2055 Param[5]
2056 ^^^^^^^^
2057
2058 Custom data 2
2059
2060 Param[6]
2061 ^^^^^^^^
2062
2063 Custom data 3
2064
2065 Param[7]
2066 ^^^^^^^^
2067
2068 Custom data 4
2069
2070 Param[8]
2071 ^^^^^^^^
2072
2073 Custom data 5
2074
2075 Param[9]
2076 ^^^^^^^^
2077
2078 Custom data 6
2079
2080 Param[10]
2081 ^^^^^^^^^
2082
2083 Custom data 7
2084
2085 Param[11]
2086 ^^^^^^^^^
2087
2088 Custom data 8
2089
2090
2091
2092 CX2341X_ENC_MUTE_VIDEO
2093 ~~~~~~~~~~~~~~~~~~~~~~
2094
2095 Enum: 217/0xD9
2096
2097 Description
2098 ^^^^^^^^^^^
2099
2100 Video muting
2101
2102 Param[0]
2103 ^^^^^^^^
2104
2105 Bit usage:
2106
2107 .. code-block:: none
2108
2109 0 '0'=video not muted
2110 '1'=video muted, creates frames with the YUV color defined below
2111 1:7 Unused
2112 8:15 V chrominance information
2113 16:23 U chrominance information
2114 24:31 Y luminance information
2115
2116
2117
2118 CX2341X_ENC_MUTE_AUDIO
2119 ~~~~~~~~~~~~~~~~~~~~~~
2120
2121 Enum: 218/0xDA
2122
2123 Description
2124 ^^^^^^^^^^^
2125
2126 Audio muting
2127
2128 Param[0]
2129 ^^^^^^^^
2130
2131 - 0=audio not muted
2132 - 1=audio muted (produces silent mpeg audio stream)
2133
2134
2135
2136 CX2341X_ENC_SET_VERT_CROP_LINE
2137 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2138
2139 Enum: 219/0xDB
2140
2141 Description
2142 ^^^^^^^^^^^
2143
2144 Something to do with 'Vertical Crop Line'
2145
2146 Param[0]
2147 ^^^^^^^^
2148
2149 If saa7114 and raw VBI capture and 60 Hz, then set to 10001.
2150 Else 0.
2151
2152
2153
2154 CX2341X_ENC_MISC
2155 ~~~~~~~~~~~~~~~~
2156
2157 Enum: 220/0xDC
2158
2159 Description
2160 ^^^^^^^^^^^
2161
2162 Miscellaneous actions. Not known for 100% what it does. It's really a
2163 sort of ioctl call. The first parameter is a command number, the second
2164 the value.
2165
2166 Param[0]
2167 ^^^^^^^^
2168
2169 Command number:
2170
2171 .. code-block:: none
2172
2173 1=set initial SCR value when starting encoding (works).
2174 2=set quality mode (apparently some test setting).
2175 3=setup advanced VIM protection handling.
2176 Always 1 for the cx23416 and 0 for cx23415.
2177 4=generate DVD compatible PTS timestamps
2178 5=USB flush mode
2179 6=something to do with the quantization matrix
2180 7=set navigation pack insertion for DVD: adds 0xbf (private stream 2)
2181 packets to the MPEG. The size of these packets is 2048 bytes (including
2182 the header of 6 bytes: 0x000001bf + length). The payload is zeroed and
2183 it is up to the application to fill them in. These packets are apparently
2184 inserted every four frames.
2185 8=enable scene change detection (seems to be a failure)
2186 9=set history parameters of the video input module
2187 10=set input field order of VIM
2188 11=set quantization matrix
2189 12=reset audio interface after channel change or input switch (has no argument).
2190 Needed for the cx2584x, not needed for the mspx4xx, but it doesn't seem to
2191 do any harm calling it regardless.
2192 13=set audio volume delay
2193 14=set audio delay
2194
2195
2196 Param[1]
2197 ^^^^^^^^
2198
2199 Command value.
2200
2201 Decoder firmware API description
2202 --------------------------------
2203
2204 .. note:: this API is part of the decoder firmware, so it's cx23415 only.
2205
2206
2207
2208 CX2341X_DEC_PING_FW
2209 ~~~~~~~~~~~~~~~~~~~
2210
2211 Enum: 0/0x00
2212
2213 Description
2214 ^^^^^^^^^^^
2215
2216 This API call does nothing. It may be used to check if the firmware
2217 is responding.
2218
2219
2220
2221 CX2341X_DEC_START_PLAYBACK
2222 ~~~~~~~~~~~~~~~~~~~~~~~~~~
2223
2224 Enum: 1/0x01
2225
2226 Description
2227 ^^^^^^^^^^^
2228
2229 Begin or resume playback.
2230
2231 Param[0]
2232 ^^^^^^^^
2233
2234 0 based frame number in GOP to begin playback from.
2235
2236 Param[1]
2237 ^^^^^^^^
2238
2239 Specifies the number of muted audio frames to play before normal
2240 audio resumes. (This is not implemented in the firmware, leave at 0)
2241
2242
2243
2244 CX2341X_DEC_STOP_PLAYBACK
2245 ~~~~~~~~~~~~~~~~~~~~~~~~~
2246
2247 Enum: 2/0x02
2248
2249 Description
2250 ^^^^^^^^^^^
2251
2252 Ends playback and clears all decoder buffers. If PTS is not zero,
2253 playback stops at specified PTS.
2254
2255 Param[0]
2256 ^^^^^^^^
2257
2258 Display 0=last frame, 1=black
2259
2260 .. note::
2261
2262 this takes effect immediately, so if you want to wait for a PTS,
2263 then use '0', otherwise the screen goes to black at once.
2264 You can call this later (even if there is no playback) with a 1 value
2265 to set the screen to black.
2266
2267 Param[1]
2268 ^^^^^^^^
2269
2270 PTS low
2271
2272 Param[2]
2273 ^^^^^^^^
2274
2275 PTS high
2276
2277
2278
2279 CX2341X_DEC_SET_PLAYBACK_SPEED
2280 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2281
2282 Enum: 3/0x03
2283
2284 Description
2285 ^^^^^^^^^^^
2286
2287 Playback stream at speed other than normal. There are two modes of
2288 operation:
2289
2290 - Smooth: host transfers entire stream and firmware drops unused
2291 frames.
2292 - Coarse: host drops frames based on indexing as required to achieve
2293 desired speed.
2294
2295 Param[0]
2296 ^^^^^^^^
2297
2298 .. code-block:: none
2299
2300 Bitmap:
2301 0:7 0 normal
2302 1 fast only "1.5 times"
2303 n nX fast, 1/nX slow
2304 30 Framedrop:
2305 '0' during 1.5 times play, every other B frame is dropped
2306 '1' during 1.5 times play, stream is unchanged (bitrate
2307 must not exceed 8mbps)
2308 31 Speed:
2309 '0' slow
2310 '1' fast
2311
2312 .. note::
2313
2314 n is limited to 2. Anything higher does not result in
2315 faster playback. Instead the host should start dropping frames.
2316
2317 Param[1]
2318 ^^^^^^^^
2319
2320 Direction: 0=forward, 1=reverse
2321
2322 .. note::
2323
2324 to make reverse playback work you have to write full GOPs in
2325 reverse order.
2326
2327 Param[2]
2328 ^^^^^^^^
2329
2330 .. code-block:: none
2331
2332 Picture mask:
2333 1=I frames
2334 3=I, P frames
2335 7=I, P, B frames
2336
2337 Param[3]
2338 ^^^^^^^^
2339
2340 B frames per GOP (for reverse play only)
2341
2342 .. note::
2343
2344 for reverse playback the Picture Mask should be set to I or I, P.
2345 Adding B frames to the mask will result in corrupt video. This field
2346 has to be set to the correct value in order to keep the timing correct.
2347
2348 Param[4]
2349 ^^^^^^^^
2350
2351 Mute audio: 0=disable, 1=enable
2352
2353 Param[5]
2354 ^^^^^^^^
2355
2356 Display 0=frame, 1=field
2357
2358 Param[6]
2359 ^^^^^^^^
2360
2361 Specifies the number of muted audio frames to play before normal audio
2362 resumes. (Not implemented in the firmware, leave at 0)
2363
2364
2365
2366 CX2341X_DEC_STEP_VIDEO
2367 ~~~~~~~~~~~~~~~~~~~~~~
2368
2369 Enum: 5/0x05
2370
2371 Description
2372 ^^^^^^^^^^^
2373
2374 Each call to this API steps the playback to the next unit defined below
2375 in the current playback direction.
2376
2377 Param[0]
2378 ^^^^^^^^
2379
2380 0=frame, 1=top field, 2=bottom field
2381
2382
2383
2384 CX2341X_DEC_SET_DMA_BLOCK_SIZE
2385 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2386
2387 Enum: 8/0x08
2388
2389 Description
2390 ^^^^^^^^^^^
2391
2392 Set DMA transfer block size. Counterpart to API 0xC9
2393
2394 Param[0]
2395 ^^^^^^^^
2396
2397 DMA transfer block size in bytes. A different size may be specified
2398 when issuing the DMA transfer command.
2399
2400
2401
2402 CX2341X_DEC_GET_XFER_INFO
2403 ~~~~~~~~~~~~~~~~~~~~~~~~~
2404
2405 Enum: 9/0x09
2406
2407 Description
2408 ^^^^^^^^^^^
2409
2410 This API call may be used to detect an end of stream condition.
2411
2412 Result[0]
2413 ^^^^^^^^^
2414
2415 Stream type
2416
2417 Result[1]
2418 ^^^^^^^^^
2419
2420 Address offset
2421
2422 Result[2]
2423 ^^^^^^^^^
2424
2425 Maximum bytes to transfer
2426
2427 Result[3]
2428 ^^^^^^^^^
2429
2430 Buffer fullness
2431
2432
2433
2434 CX2341X_DEC_GET_DMA_STATUS
2435 ~~~~~~~~~~~~~~~~~~~~~~~~~~
2436
2437 Enum: 10/0x0A
2438
2439 Description
2440 ^^^^^^^^^^^
2441
2442 Status of the last DMA transfer
2443
2444 Result[0]
2445 ^^^^^^^^^
2446
2447 Bit 1 set means transfer complete
2448 Bit 2 set means DMA error
2449 Bit 3 set means linked list error
2450
2451 Result[1]
2452 ^^^^^^^^^
2453
2454 DMA type: 0=MPEG, 1=OSD, 2=YUV
2455
2456
2457
2458 CX2341X_DEC_SCHED_DMA_FROM_HOST
2459 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2460
2461 Enum: 11/0x0B
2462
2463 Description
2464 ^^^^^^^^^^^
2465
2466 Setup DMA from host operation. Counterpart to API 0xCC
2467
2468 Param[0]
2469 ^^^^^^^^
2470
2471 Memory address of link list
2472
2473 Param[1]
2474 ^^^^^^^^
2475
2476 Total # of bytes to transfer
2477
2478 Param[2]
2479 ^^^^^^^^
2480
2481 DMA type (0=MPEG, 1=OSD, 2=YUV)
2482
2483
2484
2485 CX2341X_DEC_PAUSE_PLAYBACK
2486 ~~~~~~~~~~~~~~~~~~~~~~~~~~
2487
2488 Enum: 13/0x0D
2489
2490 Description
2491 ^^^^^^^^^^^
2492
2493 Freeze playback immediately. In this mode, when internal buffers are
2494 full, no more data will be accepted and data request IRQs will be
2495 masked.
2496
2497 Param[0]
2498 ^^^^^^^^
2499
2500 Display: 0=last frame, 1=black
2501
2502
2503
2504 CX2341X_DEC_HALT_FW
2505 ~~~~~~~~~~~~~~~~~~~
2506
2507 Enum: 14/0x0E
2508
2509 Description
2510 ^^^^^^^^^^^
2511
2512 The firmware is halted and no further API calls are serviced until
2513 the firmware is uploaded again.
2514
2515
2516
2517 CX2341X_DEC_SET_STANDARD
2518 ~~~~~~~~~~~~~~~~~~~~~~~~
2519
2520 Enum: 16/0x10
2521
2522 Description
2523 ^^^^^^^^^^^
2524
2525 Selects display standard
2526
2527 Param[0]
2528 ^^^^^^^^
2529
2530 0=NTSC, 1=PAL
2531
2532
2533
2534 CX2341X_DEC_GET_VERSION
2535 ~~~~~~~~~~~~~~~~~~~~~~~
2536
2537 Enum: 17/0x11
2538
2539 Description
2540 ^^^^^^^^^^^
2541
2542 Returns decoder firmware version information
2543
2544 Result[0]
2545 ^^^^^^^^^
2546
2547 Version bitmask:
2548 - Bits 0:15 build
2549 - Bits 16:23 minor
2550 - Bits 24:31 major
2551
2552
2553
2554 CX2341X_DEC_SET_STREAM_INPUT
2555 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2556
2557 Enum: 20/0x14
2558
2559 Description
2560 ^^^^^^^^^^^
2561
2562 Select decoder stream input port
2563
2564 Param[0]
2565 ^^^^^^^^
2566
2567 0=memory (default), 1=streaming
2568
2569
2570
2571 CX2341X_DEC_GET_TIMING_INFO
2572 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
2573
2574 Enum: 21/0x15
2575
2576 Description
2577 ^^^^^^^^^^^
2578
2579 Returns timing information from start of playback
2580
2581 Result[0]
2582 ^^^^^^^^^
2583
2584 Frame count by decode order
2585
2586 Result[1]
2587 ^^^^^^^^^
2588
2589 Video PTS bits 0:31 by display order
2590
2591 Result[2]
2592 ^^^^^^^^^
2593
2594 Video PTS bit 32 by display order
2595
2596 Result[3]
2597 ^^^^^^^^^
2598
2599 SCR bits 0:31 by display order
2600
2601 Result[4]
2602 ^^^^^^^^^
2603
2604 SCR bit 32 by display order
2605
2606
2607
2608 CX2341X_DEC_SET_AUDIO_MODE
2609 ~~~~~~~~~~~~~~~~~~~~~~~~~~
2610
2611 Enum: 22/0x16
2612
2613 Description
2614 ^^^^^^^^^^^
2615
2616 Select audio mode
2617
2618 Param[0]
2619 ^^^^^^^^
2620
2621 Dual mono mode action
2622 0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
2623
2624 Param[1]
2625 ^^^^^^^^
2626
2627 Stereo mode action:
2628 0=Stereo, 1=Left, 2=Right, 3=Mono, 4=Swap, -1=Unchanged
2629
2630
2631
2632 CX2341X_DEC_SET_EVENT_NOTIFICATION
2633 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2634
2635 Enum: 23/0x17
2636
2637 Description
2638 ^^^^^^^^^^^
2639
2640 Setup firmware to notify the host about a particular event.
2641 Counterpart to API 0xD5
2642
2643 Param[0]
2644 ^^^^^^^^
2645
2646 Event:
2647 - 0=Audio mode change between mono, (joint) stereo and dual channel.
2648 - 3=Decoder started
2649 - 4=Unknown: goes off 10-15 times per second while decoding.
2650 - 5=Some sync event: goes off once per frame.
2651
2652 Param[1]
2653 ^^^^^^^^
2654
2655 Notification 0=disabled, 1=enabled
2656
2657 Param[2]
2658 ^^^^^^^^
2659
2660 Interrupt bit
2661
2662 Param[3]
2663 ^^^^^^^^
2664
2665 Mailbox slot, -1 if no mailbox required.
2666
2667
2668
2669 CX2341X_DEC_SET_DISPLAY_BUFFERS
2670 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2671
2672 Enum: 24/0x18
2673
2674 Description
2675 ^^^^^^^^^^^
2676
2677 Number of display buffers. To decode all frames in reverse playback you
2678 must use nine buffers.
2679
2680 Param[0]
2681 ^^^^^^^^
2682
2683 0=six buffers, 1=nine buffers
2684
2685
2686
2687 CX2341X_DEC_EXTRACT_VBI
2688 ~~~~~~~~~~~~~~~~~~~~~~~
2689
2690 Enum: 25/0x19
2691
2692 Description
2693 ^^^^^^^^^^^
2694
2695 Extracts VBI data
2696
2697 Param[0]
2698 ^^^^^^^^
2699
2700 0=extract from extension & user data, 1=extract from private packets
2701
2702 Result[0]
2703 ^^^^^^^^^
2704
2705 VBI table location
2706
2707 Result[1]
2708 ^^^^^^^^^
2709
2710 VBI table size
2711
2712
2713
2714 CX2341X_DEC_SET_DECODER_SOURCE
2715 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2716
2717 Enum: 26/0x1A
2718
2719 Description
2720 ^^^^^^^^^^^
2721
2722 Selects decoder source. Ensure that the parameters passed to this
2723 API match the encoder settings.
2724
2725 Param[0]
2726 ^^^^^^^^
2727
2728 Mode: 0=MPEG from host, 1=YUV from encoder, 2=YUV from host
2729
2730 Param[1]
2731 ^^^^^^^^
2732
2733 YUV picture width
2734
2735 Param[2]
2736 ^^^^^^^^
2737
2738 YUV picture height
2739
2740 Param[3]
2741 ^^^^^^^^
2742
2743 Bitmap: see Param[0] of API 0xBD
2744
2745
2746
2747 CX2341X_DEC_SET_PREBUFFERING
2748 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2749
2750 Enum: 30/0x1E
2751
2752 Description
2753 ^^^^^^^^^^^
2754
2755 Decoder prebuffering, when enabled up to 128KB are buffered for
2756 streams <8mpbs or 640KB for streams >8mbps
2757
2758 Param[0]
2759 ^^^^^^^^
2760
2761 0=off, 1=on
2762
2763 PVR350 Video decoder registers 0x02002800 -> 0x02002B00
2764 -------------------------------------------------------
2765
2766 Author: Ian Armstrong <ian@iarmst.demon.co.uk>
2767
2768 Version: v0.4
2769
2770 Date: 12 March 2007
2771
2772
2773 This list has been worked out through trial and error. There will be mistakes
2774 and omissions. Some registers have no obvious effect so it's hard to say what
2775 they do, while others interact with each other, or require a certain load
2776 sequence. Horizontal filter setup is one example, with six registers working
2777 in unison and requiring a certain load sequence to correctly configure. The
2778 indexed colour palette is much easier to set at just two registers, but again
2779 it requires a certain load sequence.
2780
2781 Some registers are fussy about what they are set to. Load in a bad value & the
2782 decoder will fail. A firmware reload will often recover, but sometimes a reset
2783 is required. For registers containing size information, setting them to 0 is
2784 generally a bad idea. For other control registers i.e. 2878, you'll only find
2785 out what values are bad when it hangs.
2786
2787 .. code-block:: none
2788
2789 --------------------------------------------------------------------------------
2790 2800
2791 bit 0
2792 Decoder enable
2793 0 = disable
2794 1 = enable
2795 --------------------------------------------------------------------------------
2796 2804
2797 bits 0:31
2798 Decoder horizontal Y alias register 1
2799 ---------------
2800 2808
2801 bits 0:31
2802 Decoder horizontal Y alias register 2
2803 ---------------
2804 280C
2805 bits 0:31
2806 Decoder horizontal Y alias register 3
2807 ---------------
2808 2810
2809 bits 0:31
2810 Decoder horizontal Y alias register 4
2811 ---------------
2812 2814
2813 bits 0:31
2814 Decoder horizontal Y alias register 5
2815 ---------------
2816 2818
2817 bits 0:31
2818 Decoder horizontal Y alias trigger
2819
2820 These six registers control the horizontal aliasing filter for the Y plane.
2821 The first five registers must all be loaded before accessing the trigger
2822 (2818), as this register actually clocks the data through for the first
2823 five.
2824
2825 To correctly program set the filter, this whole procedure must be done 16
2826 times. The actual register contents are copied from a lookup-table in the
2827 firmware which contains 4 different filter settings.
2828
2829 --------------------------------------------------------------------------------
2830 281C
2831 bits 0:31
2832 Decoder horizontal UV alias register 1
2833 ---------------
2834 2820
2835 bits 0:31
2836 Decoder horizontal UV alias register 2
2837 ---------------
2838 2824
2839 bits 0:31
2840 Decoder horizontal UV alias register 3
2841 ---------------
2842 2828
2843 bits 0:31
2844 Decoder horizontal UV alias register 4
2845 ---------------
2846 282C
2847 bits 0:31
2848 Decoder horizontal UV alias register 5
2849 ---------------
2850 2830
2851 bits 0:31
2852 Decoder horizontal UV alias trigger
2853
2854 These six registers control the horizontal aliasing for the UV plane.
2855 Operation is the same as the Y filter, with 2830 being the trigger
2856 register.
2857
2858 --------------------------------------------------------------------------------
2859 2834
2860 bits 0:15
2861 Decoder Y source width in pixels
2862
2863 bits 16:31
2864 Decoder Y destination width in pixels
2865 ---------------
2866 2838
2867 bits 0:15
2868 Decoder UV source width in pixels
2869
2870 bits 16:31
2871 Decoder UV destination width in pixels
2872
2873 NOTE: For both registers, the resulting image must be fully visible on
2874 screen. If the image exceeds the right edge both the source and destination
2875 size must be adjusted to reflect the visible portion. For the source width,
2876 you must take into account the scaling when calculating the new value.
2877 --------------------------------------------------------------------------------
2878
2879 283C
2880 bits 0:31
2881 Decoder Y horizontal scaling
2882 Normally = Reg 2854 >> 2
2883 ---------------
2884 2840
2885 bits 0:31
2886 Decoder ?? unknown - horizontal scaling
2887 Usually 0x00080514
2888 ---------------
2889 2844
2890 bits 0:31
2891 Decoder UV horizontal scaling
2892 Normally = Reg 2854 >> 2
2893 ---------------
2894 2848
2895 bits 0:31
2896 Decoder ?? unknown - horizontal scaling
2897 Usually 0x00100514
2898 ---------------
2899 284C
2900 bits 0:31
2901 Decoder ?? unknown - Y plane
2902 Usually 0x00200020
2903 ---------------
2904 2850
2905 bits 0:31
2906 Decoder ?? unknown - UV plane
2907 Usually 0x00200020
2908 ---------------
2909 2854
2910 bits 0:31
2911 Decoder 'master' value for horizontal scaling
2912 ---------------
2913 2858
2914 bits 0:31
2915 Decoder ?? unknown
2916 Usually 0
2917 ---------------
2918 285C
2919 bits 0:31
2920 Decoder ?? unknown
2921 Normally = Reg 2854 >> 1
2922 ---------------
2923 2860
2924 bits 0:31
2925 Decoder ?? unknown
2926 Usually 0
2927 ---------------
2928 2864
2929 bits 0:31
2930 Decoder ?? unknown
2931 Normally = Reg 2854 >> 1
2932 ---------------
2933 2868
2934 bits 0:31
2935 Decoder ?? unknown
2936 Usually 0
2937
2938 Most of these registers either control horizontal scaling, or appear linked
2939 to it in some way. Register 2854 contains the 'master' value & the other
2940 registers can be calculated from that one. You must also remember to
2941 correctly set the divider in Reg 2874.
2942
2943 To enlarge:
2944 Reg 2854 = (source_width * 0x00200000) / destination_width
2945 Reg 2874 = No divide
2946
2947 To reduce from full size down to half size:
2948 Reg 2854 = (source_width/2 * 0x00200000) / destination width
2949 Reg 2874 = Divide by 2
2950
2951 To reduce from half size down to quarter size:
2952 Reg 2854 = (source_width/4 * 0x00200000) / destination width
2953 Reg 2874 = Divide by 4
2954
2955 The result is always rounded up.
2956
2957 --------------------------------------------------------------------------------
2958 286C
2959 bits 0:15
2960 Decoder horizontal Y buffer offset
2961
2962 bits 15:31
2963 Decoder horizontal UV buffer offset
2964
2965 Offset into the video image buffer. If the offset is gradually incremented,
2966 the on screen image will move left & wrap around higher up on the right.
2967
2968 --------------------------------------------------------------------------------
2969 2870
2970 bits 0:15
2971 Decoder horizontal Y output offset
2972
2973 bits 16:31
2974 Decoder horizontal UV output offset
2975
2976 Offsets the actual video output. Controls output alignment of the Y & UV
2977 planes. The higher the value, the greater the shift to the left. Use
2978 reg 2890 to move the image right.
2979
2980 --------------------------------------------------------------------------------
2981 2874
2982 bits 0:1
2983 Decoder horizontal Y output size divider
2984 00 = No divide
2985 01 = Divide by 2
2986 10 = Divide by 3
2987
2988 bits 4:5
2989 Decoder horizontal UV output size divider
2990 00 = No divide
2991 01 = Divide by 2
2992 10 = Divide by 3
2993
2994 bit 8
2995 Decoder ?? unknown
2996 0 = Normal
2997 1 = Affects video output levels
2998
2999 bit 16
3000 Decoder ?? unknown
3001 0 = Normal
3002 1 = Disable horizontal filter
3003
3004 --------------------------------------------------------------------------------
3005 2878
3006 bit 0
3007 ?? unknown
3008
3009 bit 1
3010 osd on/off
3011 0 = osd off
3012 1 = osd on
3013
3014 bit 2
3015 Decoder + osd video timing
3016 0 = NTSC
3017 1 = PAL
3018
3019 bits 3:4
3020 ?? unknown
3021
3022 bit 5
3023 Decoder + osd
3024 Swaps upper & lower fields
3025
3026 --------------------------------------------------------------------------------
3027 287C
3028 bits 0:10
3029 Decoder & osd ?? unknown
3030 Moves entire screen horizontally. Starts at 0x005 with the screen
3031 shifted heavily to the right. Incrementing in steps of 0x004 will
3032 gradually shift the screen to the left.
3033
3034 bits 11:31
3035 ?? unknown
3036
3037 Normally contents are 0x00101111 (NTSC) or 0x1010111d (PAL)
3038
3039 --------------------------------------------------------------------------------
3040 2880 -------- ?? unknown
3041 2884 -------- ?? unknown
3042 --------------------------------------------------------------------------------
3043 2888
3044 bit 0
3045 Decoder + osd ?? unknown
3046 0 = Normal
3047 1 = Misaligned fields (Correctable through 289C & 28A4)
3048
3049 bit 4
3050 ?? unknown
3051
3052 bit 8
3053 ?? unknown
3054
3055 Warning: Bad values will require a firmware reload to recover.
3056 Known to be bad are 0x000,0x011,0x100,0x111
3057 --------------------------------------------------------------------------------
3058 288C
3059 bits 0:15
3060 osd ?? unknown
3061 Appears to affect the osd position stability. The higher the value the
3062 more unstable it becomes. Decoder output remains stable.
3063
3064 bits 16:31
3065 osd ?? unknown
3066 Same as bits 0:15
3067
3068 --------------------------------------------------------------------------------
3069 2890
3070 bits 0:11
3071 Decoder output horizontal offset.
3072
3073 Horizontal offset moves the video image right. A small left shift is
3074 possible, but it's better to use reg 2870 for that due to its greater
3075 range.
3076
3077 NOTE: Video corruption will occur if video window is shifted off the right
3078 edge. To avoid this read the notes for 2834 & 2838.
3079 --------------------------------------------------------------------------------
3080 2894
3081 bits 0:23
3082 Decoder output video surround colour.
3083
3084 Contains the colour (in yuv) used to fill the screen when the video is
3085 running in a window.
3086 --------------------------------------------------------------------------------
3087 2898
3088 bits 0:23
3089 Decoder video window colour
3090 Contains the colour (in yuv) used to fill the video window when the
3091 video is turned off.
3092
3093 bit 24
3094 Decoder video output
3095 0 = Video on
3096 1 = Video off
3097
3098 bit 28
3099 Decoder plane order
3100 0 = Y,UV
3101 1 = UV,Y
3102
3103 bit 29
3104 Decoder second plane byte order
3105 0 = Normal (UV)
3106 1 = Swapped (VU)
3107
3108 In normal usage, the first plane is Y & the second plane is UV. Though the
3109 order of the planes can be swapped, only the byte order of the second plane
3110 can be swapped. This isn't much use for the Y plane, but can be useful for
3111 the UV plane.
3112
3113 --------------------------------------------------------------------------------
3114 289C
3115 bits 0:15
3116 Decoder vertical field offset 1
3117
3118 bits 16:31
3119 Decoder vertical field offset 2
3120
3121 Controls field output vertical alignment. The higher the number, the lower
3122 the image on screen. Known starting values are 0x011E0017 (NTSC) &
3123 0x01500017 (PAL)
3124 --------------------------------------------------------------------------------
3125 28A0
3126 bits 0:15
3127 Decoder & osd width in pixels
3128
3129 bits 16:31
3130 Decoder & osd height in pixels
3131
3132 All output from the decoder & osd are disabled beyond this area. Decoder
3133 output will simply go black outside of this region. If the osd tries to
3134 exceed this area it will become corrupt.
3135 --------------------------------------------------------------------------------
3136 28A4
3137 bits 0:11
3138 osd left shift.
3139
3140 Has a range of 0x770->0x7FF. With the exception of 0, any value outside of
3141 this range corrupts the osd.
3142 --------------------------------------------------------------------------------
3143 28A8
3144 bits 0:15
3145 osd vertical field offset 1
3146
3147 bits 16:31
3148 osd vertical field offset 2
3149
3150 Controls field output vertical alignment. The higher the number, the lower
3151 the image on screen. Known starting values are 0x011E0017 (NTSC) &
3152 0x01500017 (PAL)
3153 --------------------------------------------------------------------------------
3154 28AC -------- ?? unknown
3155 |
3156 V
3157 28BC -------- ?? unknown
3158 --------------------------------------------------------------------------------
3159 28C0
3160 bit 0
3161 Current output field
3162 0 = first field
3163 1 = second field
3164
3165 bits 16:31
3166 Current scanline
3167 The scanline counts from the top line of the first field
3168 through to the last line of the second field.
3169 --------------------------------------------------------------------------------
3170 28C4 -------- ?? unknown
3171 |
3172 V
3173 28F8 -------- ?? unknown
3174 --------------------------------------------------------------------------------
3175 28FC
3176 bit 0
3177 ?? unknown
3178 0 = Normal
3179 1 = Breaks decoder & osd output
3180 --------------------------------------------------------------------------------
3181 2900
3182 bits 0:31
3183 Decoder vertical Y alias register 1
3184 ---------------
3185 2904
3186 bits 0:31
3187 Decoder vertical Y alias register 2
3188 ---------------
3189 2908
3190 bits 0:31
3191 Decoder vertical Y alias trigger
3192
3193 These three registers control the vertical aliasing filter for the Y plane.
3194 Operation is similar to the horizontal Y filter (2804). The only real
3195 difference is that there are only two registers to set before accessing
3196 the trigger register (2908). As for the horizontal filter, the values are
3197 taken from a lookup table in the firmware, and the procedure must be
3198 repeated 16 times to fully program the filter.
3199 --------------------------------------------------------------------------------
3200 290C
3201 bits 0:31
3202 Decoder vertical UV alias register 1
3203 ---------------
3204 2910
3205 bits 0:31
3206 Decoder vertical UV alias register 2
3207 ---------------
3208 2914
3209 bits 0:31
3210 Decoder vertical UV alias trigger
3211
3212 These three registers control the vertical aliasing filter for the UV
3213 plane. Operation is the same as the Y filter, with 2914 being the trigger.
3214 --------------------------------------------------------------------------------
3215 2918
3216 bits 0:15
3217 Decoder Y source height in pixels
3218
3219 bits 16:31
3220 Decoder Y destination height in pixels
3221 ---------------
3222 291C
3223 bits 0:15
3224 Decoder UV source height in pixels divided by 2
3225
3226 bits 16:31
3227 Decoder UV destination height in pixels
3228
3229 NOTE: For both registers, the resulting image must be fully visible on
3230 screen. If the image exceeds the bottom edge both the source and
3231 destination size must be adjusted to reflect the visible portion. For the
3232 source height, you must take into account the scaling when calculating the
3233 new value.
3234 --------------------------------------------------------------------------------
3235 2920
3236 bits 0:31
3237 Decoder Y vertical scaling
3238 Normally = Reg 2930 >> 2
3239 ---------------
3240 2924
3241 bits 0:31
3242 Decoder Y vertical scaling
3243 Normally = Reg 2920 + 0x514
3244 ---------------
3245 2928
3246 bits 0:31
3247 Decoder UV vertical scaling
3248 When enlarging = Reg 2930 >> 2
3249 When reducing = Reg 2930 >> 3
3250 ---------------
3251 292C
3252 bits 0:31
3253 Decoder UV vertical scaling
3254 Normally = Reg 2928 + 0x514
3255 ---------------
3256 2930
3257 bits 0:31
3258 Decoder 'master' value for vertical scaling
3259 ---------------
3260 2934
3261 bits 0:31
3262 Decoder ?? unknown - Y vertical scaling
3263 ---------------
3264 2938
3265 bits 0:31
3266 Decoder Y vertical scaling
3267 Normally = Reg 2930
3268 ---------------
3269 293C
3270 bits 0:31
3271 Decoder ?? unknown - Y vertical scaling
3272 ---------------
3273 2940
3274 bits 0:31
3275 Decoder UV vertical scaling
3276 When enlarging = Reg 2930 >> 1
3277 When reducing = Reg 2930
3278 ---------------
3279 2944
3280 bits 0:31
3281 Decoder ?? unknown - UV vertical scaling
3282 ---------------
3283 2948
3284 bits 0:31
3285 Decoder UV vertical scaling
3286 Normally = Reg 2940
3287 ---------------
3288 294C
3289 bits 0:31
3290 Decoder ?? unknown - UV vertical scaling
3291
3292 Most of these registers either control vertical scaling, or appear linked
3293 to it in some way. Register 2930 contains the 'master' value & all other
3294 registers can be calculated from that one. You must also remember to
3295 correctly set the divider in Reg 296C
3296
3297 To enlarge:
3298 Reg 2930 = (source_height * 0x00200000) / destination_height
3299 Reg 296C = No divide
3300
3301 To reduce from full size down to half size:
3302 Reg 2930 = (source_height/2 * 0x00200000) / destination height
3303 Reg 296C = Divide by 2
3304
3305 To reduce from half down to quarter.
3306 Reg 2930 = (source_height/4 * 0x00200000) / destination height
3307 Reg 296C = Divide by 4
3308
3309 --------------------------------------------------------------------------------
3310 2950
3311 bits 0:15
3312 Decoder Y line index into display buffer, first field
3313
3314 bits 16:31
3315 Decoder Y vertical line skip, first field
3316 --------------------------------------------------------------------------------
3317 2954
3318 bits 0:15
3319 Decoder Y line index into display buffer, second field
3320
3321 bits 16:31
3322 Decoder Y vertical line skip, second field
3323 --------------------------------------------------------------------------------
3324 2958
3325 bits 0:15
3326 Decoder UV line index into display buffer, first field
3327
3328 bits 16:31
3329 Decoder UV vertical line skip, first field
3330 --------------------------------------------------------------------------------
3331 295C
3332 bits 0:15
3333 Decoder UV line index into display buffer, second field
3334
3335 bits 16:31
3336 Decoder UV vertical line skip, second field
3337 --------------------------------------------------------------------------------
3338 2960
3339 bits 0:15
3340 Decoder destination height minus 1
3341
3342 bits 16:31
3343 Decoder destination height divided by 2
3344 --------------------------------------------------------------------------------
3345 2964
3346 bits 0:15
3347 Decoder Y vertical offset, second field
3348
3349 bits 16:31
3350 Decoder Y vertical offset, first field
3351
3352 These two registers shift the Y plane up. The higher the number, the
3353 greater the shift.
3354 --------------------------------------------------------------------------------
3355 2968
3356 bits 0:15
3357 Decoder UV vertical offset, second field
3358
3359 bits 16:31
3360 Decoder UV vertical offset, first field
3361
3362 These two registers shift the UV plane up. The higher the number, the
3363 greater the shift.
3364 --------------------------------------------------------------------------------
3365 296C
3366 bits 0:1
3367 Decoder vertical Y output size divider
3368 00 = No divide
3369 01 = Divide by 2
3370 10 = Divide by 4
3371
3372 bits 8:9
3373 Decoder vertical UV output size divider
3374 00 = No divide
3375 01 = Divide by 2
3376 10 = Divide by 4
3377 --------------------------------------------------------------------------------
3378 2970
3379 bit 0
3380 Decoder ?? unknown
3381 0 = Normal
3382 1 = Affect video output levels
3383
3384 bit 16
3385 Decoder ?? unknown
3386 0 = Normal
3387 1 = Disable vertical filter
3388
3389 --------------------------------------------------------------------------------
3390 2974 -------- ?? unknown
3391 |
3392 V
3393 29EF -------- ?? unknown
3394 --------------------------------------------------------------------------------
3395 2A00
3396 bits 0:2
3397 osd colour mode
3398 000 = 8 bit indexed
3399 001 = 16 bit (565)
3400 010 = 15 bit (555)
3401 011 = 12 bit (444)
3402 100 = 32 bit (8888)
3403
3404 bits 4:5
3405 osd display bpp
3406 01 = 8 bit
3407 10 = 16 bit
3408 11 = 32 bit
3409
3410 bit 8
3411 osd global alpha
3412 0 = Off
3413 1 = On
3414
3415 bit 9
3416 osd local alpha
3417 0 = Off
3418 1 = On
3419
3420 bit 10
3421 osd colour key
3422 0 = Off
3423 1 = On
3424
3425 bit 11
3426 osd ?? unknown
3427 Must be 1
3428
3429 bit 13
3430 osd colour space
3431 0 = ARGB
3432 1 = AYVU
3433
3434 bits 16:31
3435 osd ?? unknown
3436 Must be 0x001B (some kind of buffer pointer ?)
3437
3438 When the bits-per-pixel is set to 8, the colour mode is ignored and
3439 assumed to be 8 bit indexed. For 16 & 32 bits-per-pixel the colour depth
3440 is honoured, and when using a colour depth that requires fewer bytes than
3441 allocated the extra bytes are used as padding. So for a 32 bpp with 8 bit
3442 index colour, there are 3 padding bytes per pixel. It's also possible to
3443 select 16bpp with a 32 bit colour mode. This results in the pixel width
3444 being doubled, but the color key will not work as expected in this mode.
3445
3446 Colour key is as it suggests. You designate a colour which will become
3447 completely transparent. When using 565, 555 or 444 colour modes, the
3448 colour key is always 16 bits wide. The colour to key on is set in Reg 2A18.
3449
3450 Local alpha works differently depending on the colour mode. For 32bpp & 8
3451 bit indexed, local alpha is a per-pixel 256 step transparency, with 0 being
3452 transparent and 255 being solid. For the 16bpp modes 555 & 444, the unused
3453 bit(s) act as a simple transparency switch, with 0 being solid & 1 being
3454 fully transparent. There is no local alpha support for 16bit 565.
3455
3456 Global alpha is a 256 step transparency that applies to the entire osd,
3457 with 0 being transparent & 255 being solid.
3458
3459 It's possible to combine colour key, local alpha & global alpha.
3460 --------------------------------------------------------------------------------
3461 2A04
3462 bits 0:15
3463 osd x coord for left edge
3464
3465 bits 16:31
3466 osd y coord for top edge
3467 ---------------
3468 2A08
3469 bits 0:15
3470 osd x coord for right edge
3471
3472 bits 16:31
3473 osd y coord for bottom edge
3474
3475 For both registers, (0,0) = top left corner of the display area. These
3476 registers do not control the osd size, only where it's positioned & how
3477 much is visible. The visible osd area cannot exceed the right edge of the
3478 display, otherwise the osd will become corrupt. See reg 2A10 for
3479 setting osd width.
3480 --------------------------------------------------------------------------------
3481 2A0C
3482 bits 0:31
3483 osd buffer index
3484
3485 An index into the osd buffer. Slowly incrementing this moves the osd left,
3486 wrapping around onto the right edge
3487 --------------------------------------------------------------------------------
3488 2A10
3489 bits 0:11
3490 osd buffer 32 bit word width
3491
3492 Contains the width of the osd measured in 32 bit words. This means that all
3493 colour modes are restricted to a byte width which is divisible by 4.
3494 --------------------------------------------------------------------------------
3495 2A14
3496 bits 0:15
3497 osd height in pixels
3498
3499 bits 16:32
3500 osd line index into buffer
3501 osd will start displaying from this line.
3502 --------------------------------------------------------------------------------
3503 2A18
3504 bits 0:31
3505 osd colour key
3506
3507 Contains the colour value which will be transparent.
3508 --------------------------------------------------------------------------------
3509 2A1C
3510 bits 0:7
3511 osd global alpha
3512
3513 Contains the global alpha value (equiv ivtvfbctl --alpha XX)
3514 --------------------------------------------------------------------------------
3515 2A20 -------- ?? unknown
3516 |
3517 V
3518 2A2C -------- ?? unknown
3519 --------------------------------------------------------------------------------
3520 2A30
3521 bits 0:7
3522 osd colour to change in indexed palette
3523 ---------------
3524 2A34
3525 bits 0:31
3526 osd colour for indexed palette
3527
3528 To set the new palette, first load the index of the colour to change into
3529 2A30, then load the new colour into 2A34. The full palette is 256 colours,
3530 so the index range is 0x00-0xFF
3531 --------------------------------------------------------------------------------
3532 2A38 -------- ?? unknown
3533 2A3C -------- ?? unknown
3534 --------------------------------------------------------------------------------
3535 2A40
3536 bits 0:31
3537 osd ?? unknown
3538
3539 Affects overall brightness, wrapping around to black
3540 --------------------------------------------------------------------------------
3541 2A44
3542 bits 0:31
3543 osd ?? unknown
3544
3545 Green tint
3546 --------------------------------------------------------------------------------
3547 2A48
3548 bits 0:31
3549 osd ?? unknown
3550
3551 Red tint
3552 --------------------------------------------------------------------------------
3553 2A4C
3554 bits 0:31
3555 osd ?? unknown
3556
3557 Affects overall brightness, wrapping around to black
3558 --------------------------------------------------------------------------------
3559 2A50
3560 bits 0:31
3561 osd ?? unknown
3562
3563 Colour shift
3564 --------------------------------------------------------------------------------
3565 2A54
3566 bits 0:31
3567 osd ?? unknown
3568
3569 Colour shift
3570 --------------------------------------------------------------------------------
3571 2A58 -------- ?? unknown
3572 |
3573 V
3574 2AFC -------- ?? unknown
3575 --------------------------------------------------------------------------------
3576 2B00
3577 bit 0
3578 osd filter control
3579 0 = filter off
3580 1 = filter on
3581
3582 bits 1:4
3583 osd ?? unknown
3584
3585 --------------------------------------------------------------------------------
3586
3587 The cx231xx DMA engine
3588 ----------------------
3589
3590
3591 This page describes the structures and procedures used by the cx2341x DMA
3592 engine.
3593
3594 Introduction
3595 ~~~~~~~~~~~~
3596
3597 The cx2341x PCI interface is busmaster capable. This means it has a DMA
3598 engine to efficiently transfer large volumes of data between the card and main
3599 memory without requiring help from a CPU. Like most hardware, it must operate
3600 on contiguous physical memory. This is difficult to come by in large quantities
3601 on virtual memory machines.
3602
3603 Therefore, it also supports a technique called "scatter-gather". The card can
3604 transfer multiple buffers in one operation. Instead of allocating one large
3605 contiguous buffer, the driver can allocate several smaller buffers.
3606
3607 In practice, I've seen the average transfer to be roughly 80K, but transfers
3608 above 128K were not uncommon, particularly at startup. The 128K figure is
3609 important, because that is the largest block that the kernel can normally
3610 allocate. Even still, 128K blocks are hard to come by, so the driver writer is
3611 urged to choose a smaller block size and learn the scatter-gather technique.
3612
3613 Mailbox #10 is reserved for DMA transfer information.
3614
3615 Note: the hardware expects little-endian data ('intel format').
3616
3617 Flow
3618 ~~~~
3619
3620 This section describes, in general, the order of events when handling DMA
3621 transfers. Detailed information follows this section.
3622
3623 - The card raises the Encoder interrupt.
3624 - The driver reads the transfer type, offset and size from Mailbox #10.
3625 - The driver constructs the scatter-gather array from enough free dma buffers
3626 to cover the size.
3627 - The driver schedules the DMA transfer via the ScheduleDMAtoHost API call.
3628 - The card raises the DMA Complete interrupt.
3629 - The driver checks the DMA status register for any errors.
3630 - The driver post-processes the newly transferred buffers.
3631
3632 NOTE! It is possible that the Encoder and DMA Complete interrupts get raised
3633 simultaneously. (End of the last, start of the next, etc.)
3634
3635 Mailbox #10
3636 ~~~~~~~~~~~
3637
3638 The Flags, Command, Return Value and Timeout fields are ignored.
3639
3640 - Name: Mailbox #10
3641 - Results[0]: Type: 0: MPEG.
3642 - Results[1]: Offset: The position relative to the card's memory space.
3643 - Results[2]: Size: The exact number of bytes to transfer.
3644
3645 My speculation is that since the StartCapture API has a capture type of "RAW"
3646 available, that the type field will have other values that correspond to YUV
3647 and PCM data.
3648
3649 Scatter-Gather Array
3650 ~~~~~~~~~~~~~~~~~~~~
3651
3652 The scatter-gather array is a contiguously allocated block of memory that
3653 tells the card the source and destination of each data-block to transfer.
3654 Card "addresses" are derived from the offset supplied by Mailbox #10. Host
3655 addresses are the physical memory location of the target DMA buffer.
3656
3657 Each S-G array element is a struct of three 32-bit words. The first word is
3658 the source address, the second is the destination address. Both take up the
3659 entire 32 bits. The lowest 18 bits of the third word is the transfer byte
3660 count. The high-bit of the third word is the "last" flag. The last-flag tells
3661 the card to raise the DMA_DONE interrupt. From hard personal experience, if
3662 you forget to set this bit, the card will still "work" but the stream will
3663 most likely get corrupted.
3664
3665 The transfer count must be a multiple of 256. Therefore, the driver will need
3666 to track how much data in the target buffer is valid and deal with it
3667 accordingly.
3668
3669 Array Element:
3670
3671 - 32-bit Source Address
3672 - 32-bit Destination Address
3673 - 14-bit reserved (high bit is the last flag)
3674 - 18-bit byte count
3675
3676 DMA Transfer Status
3677 ~~~~~~~~~~~~~~~~~~~
3678
3679 Register 0x0004 holds the DMA Transfer Status:
3680
3681 - bit 0: read completed
3682 - bit 1: write completed
3683 - bit 2: DMA read error
3684 - bit 3: DMA write error
3685 - bit 4: Scatter-Gather array error
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