Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / dv.c
... / ...
CommitLineData
1/*
2 * General DV demuxer
3 * Copyright (c) 2003 Roman Shaposhnik
4 *
5 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6 * of DV technical info.
7 *
8 * Raw DV format
9 * Copyright (c) 2002 Fabrice Bellard
10 *
11 * 50 Mbps (DVCPRO50) and 100 Mbps (DVCPRO HD) support
12 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
13 * Funded by BBC Research & Development
14 *
15 * This file is part of FFmpeg.
16 *
17 * FFmpeg is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU Lesser General Public
19 * License as published by the Free Software Foundation; either
20 * version 2.1 of the License, or (at your option) any later version.
21 *
22 * FFmpeg is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * Lesser General Public License for more details.
26 *
27 * You should have received a copy of the GNU Lesser General Public
28 * License along with FFmpeg; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 */
31#include <time.h>
32#include "avformat.h"
33#include "internal.h"
34#include "libavcodec/dv_profile.h"
35#include "libavcodec/dv.h"
36#include "libavutil/channel_layout.h"
37#include "libavutil/intreadwrite.h"
38#include "libavutil/mathematics.h"
39#include "libavutil/timecode.h"
40#include "dv.h"
41#include "libavutil/avassert.h"
42
43struct DVDemuxContext {
44 const AVDVProfile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
45 AVFormatContext* fctx;
46 AVStream* vst;
47 AVStream* ast[4];
48 AVPacket audio_pkt[4];
49 uint8_t audio_buf[4][8192];
50 int ach;
51 int frames;
52 uint64_t abytes;
53};
54
55static inline uint16_t dv_audio_12to16(uint16_t sample)
56{
57 uint16_t shift, result;
58
59 sample = (sample < 0x800) ? sample : sample | 0xf000;
60 shift = (sample & 0xf00) >> 8;
61
62 if (shift < 0x2 || shift > 0xd) {
63 result = sample;
64 } else if (shift < 0x8) {
65 shift--;
66 result = (sample - (256 * shift)) << shift;
67 } else {
68 shift = 0xe - shift;
69 result = ((sample + ((256 * shift) + 1)) << shift) - 1;
70 }
71
72 return result;
73}
74
75static const uint8_t *dv_extract_pack(const uint8_t *frame, enum dv_pack_type t)
76{
77 int offs;
78 int c;
79
80 for (c = 0; c < 10; c++) {
81 switch (t) {
82 case dv_audio_source:
83 if (c&1) offs = (80 * 6 + 80 * 16 * 0 + 3 + c*12000);
84 else offs = (80 * 6 + 80 * 16 * 3 + 3 + c*12000);
85 break;
86 case dv_audio_control:
87 if (c&1) offs = (80 * 6 + 80 * 16 * 1 + 3 + c*12000);
88 else offs = (80 * 6 + 80 * 16 * 4 + 3 + c*12000);
89 break;
90 case dv_video_control:
91 if (c&1) offs = (80 * 3 + 8 + c*12000);
92 else offs = (80 * 5 + 48 + 5 + c*12000);
93 break;
94 case dv_timecode:
95 offs = (80*1 + 3 + 3);
96 break;
97 default:
98 return NULL;
99 }
100 if (frame[offs] == t)
101 break;
102 }
103
104 return frame[offs] == t ? &frame[offs] : NULL;
105}
106
107static const int dv_audio_frequency[3] = {
108 48000, 44100, 32000,
109};
110
111/*
112 * There's a couple of assumptions being made here:
113 * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
114 * We can pass them upwards when libavcodec will be ready to deal with them.
115 * 2. We don't do software emphasis.
116 * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
117 * are converted into 16bit linear ones.
118 */
119static int dv_extract_audio(const uint8_t *frame, uint8_t **ppcm,
120 const AVDVProfile *sys)
121{
122 int size, chan, i, j, d, of, smpls, freq, quant, half_ch;
123 uint16_t lc, rc;
124 const uint8_t *as_pack;
125 uint8_t *pcm, ipcm;
126
127 as_pack = dv_extract_pack(frame, dv_audio_source);
128 if (!as_pack) /* No audio ? */
129 return 0;
130
131 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
132 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
133 quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
134
135 if (quant > 1)
136 return -1; /* unsupported quantization */
137
138 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency))
139 return AVERROR_INVALIDDATA;
140
141 size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
142 half_ch = sys->difseg_size / 2;
143
144 /* We work with 720p frames split in half, thus even frames have
145 * channels 0,1 and odd 2,3. */
146 ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0;
147
148 if (ipcm + sys->n_difchan > (quant == 1 ? 2 : 4)) {
149 av_log(NULL, AV_LOG_ERROR, "too many dv pcm frames\n");
150 return AVERROR_INVALIDDATA;
151 }
152
153 /* for each DIF channel */
154 for (chan = 0; chan < sys->n_difchan; chan++) {
155 av_assert0(ipcm<4);
156 pcm = ppcm[ipcm++];
157 if (!pcm)
158 break;
159
160 /* for each DIF segment */
161 for (i = 0; i < sys->difseg_size; i++) {
162 frame += 6 * 80; /* skip DIF segment header */
163 if (quant == 1 && i == half_ch) {
164 /* next stereo channel (12bit mode only) */
165 av_assert0(ipcm<4);
166 pcm = ppcm[ipcm++];
167 if (!pcm)
168 break;
169 }
170
171 /* for each AV sequence */
172 for (j = 0; j < 9; j++) {
173 for (d = 8; d < 80; d += 2) {
174 if (quant == 0) { /* 16bit quantization */
175 of = sys->audio_shuffle[i][j] +
176 (d - 8) / 2 * sys->audio_stride;
177 if (of * 2 >= size)
178 continue;
179
180 /* FIXME: maybe we have to admit that DV is a
181 * big-endian PCM */
182 pcm[of * 2] = frame[d + 1];
183 pcm[of * 2 + 1] = frame[d];
184
185 if (pcm[of * 2 + 1] == 0x80 && pcm[of * 2] == 0x00)
186 pcm[of * 2 + 1] = 0;
187 } else { /* 12bit quantization */
188 lc = ((uint16_t)frame[d] << 4) |
189 ((uint16_t)frame[d + 2] >> 4);
190 rc = ((uint16_t)frame[d + 1] << 4) |
191 ((uint16_t)frame[d + 2] & 0x0f);
192 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
193 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
194
195 of = sys->audio_shuffle[i % half_ch][j] +
196 (d - 8) / 3 * sys->audio_stride;
197 if (of * 2 >= size)
198 continue;
199
200 /* FIXME: maybe we have to admit that DV is a
201 * big-endian PCM */
202 pcm[of * 2] = lc & 0xff;
203 pcm[of * 2 + 1] = lc >> 8;
204 of = sys->audio_shuffle[i % half_ch + half_ch][j] +
205 (d - 8) / 3 * sys->audio_stride;
206 /* FIXME: maybe we have to admit that DV is a
207 * big-endian PCM */
208 pcm[of * 2] = rc & 0xff;
209 pcm[of * 2 + 1] = rc >> 8;
210 ++d;
211 }
212 }
213
214 frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
215 }
216 }
217 }
218
219 return size;
220}
221
222static int dv_extract_audio_info(DVDemuxContext *c, const uint8_t *frame)
223{
224 const uint8_t *as_pack;
225 int freq, stype, smpls, quant, i, ach;
226
227 as_pack = dv_extract_pack(frame, dv_audio_source);
228 if (!as_pack || !c->sys) { /* No audio ? */
229 c->ach = 0;
230 return 0;
231 }
232
233 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
234 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
235 stype = as_pack[3] & 0x1f; /* 0 - 2CH, 2 - 4CH, 3 - 8CH */
236 quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
237
238 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) {
239 av_log(c->fctx, AV_LOG_ERROR,
240 "Unrecognized audio sample rate index (%d)\n", freq);
241 return 0;
242 }
243
244 if (stype > 3) {
245 av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype);
246 c->ach = 0;
247 return 0;
248 }
249
250 /* note: ach counts PAIRS of channels (i.e. stereo channels) */
251 ach = ((int[4]) { 1, 0, 2, 4 })[stype];
252 if (ach == 1 && quant && freq == 2)
253 ach = 2;
254
255 /* Dynamic handling of the audio streams in DV */
256 for (i = 0; i < ach; i++) {
257 if (!c->ast[i]) {
258 c->ast[i] = avformat_new_stream(c->fctx, NULL);
259 if (!c->ast[i])
260 break;
261 avpriv_set_pts_info(c->ast[i], 64, 1, 30000);
262 c->ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
263 c->ast[i]->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
264
265 av_init_packet(&c->audio_pkt[i]);
266 c->audio_pkt[i].size = 0;
267 c->audio_pkt[i].data = c->audio_buf[i];
268 c->audio_pkt[i].stream_index = c->ast[i]->index;
269 c->audio_pkt[i].flags |= AV_PKT_FLAG_KEY;
270 }
271 c->ast[i]->codec->sample_rate = dv_audio_frequency[freq];
272 c->ast[i]->codec->channels = 2;
273 c->ast[i]->codec->channel_layout = AV_CH_LAYOUT_STEREO;
274 c->ast[i]->codec->bit_rate = 2 * dv_audio_frequency[freq] * 16;
275 c->ast[i]->start_time = 0;
276 }
277 c->ach = i;
278
279 return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
280}
281
282static int dv_extract_video_info(DVDemuxContext *c, const uint8_t *frame)
283{
284 const uint8_t *vsc_pack;
285 AVCodecContext *avctx;
286 int apt, is16_9;
287 int size = 0;
288
289 if (c->sys) {
290 avctx = c->vst->codec;
291
292 avpriv_set_pts_info(c->vst, 64, c->sys->time_base.num,
293 c->sys->time_base.den);
294 c->vst->avg_frame_rate = av_inv_q(c->vst->time_base);
295
296 /* finding out SAR is a little bit messy */
297 vsc_pack = dv_extract_pack(frame, dv_video_control);
298 apt = frame[4] & 0x07;
299 is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
300 (!apt && (vsc_pack[2] & 0x07) == 0x07)));
301 c->vst->sample_aspect_ratio = c->sys->sar[is16_9];
302 avctx->bit_rate = av_rescale_q(c->sys->frame_size,
303 (AVRational) { 8, 1 },
304 c->sys->time_base);
305 size = c->sys->frame_size;
306 }
307 return size;
308}
309
310static int dv_extract_timecode(DVDemuxContext* c, const uint8_t* frame, char *tc)
311{
312 const uint8_t *tc_pack;
313
314 // For PAL systems, drop frame bit is replaced by an arbitrary
315 // bit so its value should not be considered. Drop frame timecode
316 // is only relevant for NTSC systems.
317 int prevent_df = c->sys->ltc_divisor == 25 || c->sys->ltc_divisor == 50;
318
319 tc_pack = dv_extract_pack(frame, dv_timecode);
320 if (!tc_pack)
321 return 0;
322 av_timecode_make_smpte_tc_string(tc, AV_RB32(tc_pack + 1), prevent_df);
323 return 1;
324}
325
326/* The following 3 functions constitute our interface to the world */
327
328DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
329{
330 DVDemuxContext *c;
331
332 c = av_mallocz(sizeof(DVDemuxContext));
333 if (!c)
334 return NULL;
335
336 c->vst = avformat_new_stream(s, NULL);
337 if (!c->vst) {
338 av_free(c);
339 return NULL;
340 }
341
342 c->fctx = s;
343 c->vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
344 c->vst->codec->codec_id = AV_CODEC_ID_DVVIDEO;
345 c->vst->codec->bit_rate = 25000000;
346 c->vst->start_time = 0;
347
348 return c;
349}
350
351int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
352{
353 int size = -1;
354 int i;
355
356 for (i = 0; i < c->ach; i++) {
357 if (c->ast[i] && c->audio_pkt[i].size) {
358 *pkt = c->audio_pkt[i];
359 c->audio_pkt[i].size = 0;
360 size = pkt->size;
361 break;
362 }
363 }
364
365 return size;
366}
367
368int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
369 uint8_t *buf, int buf_size, int64_t pos)
370{
371 int size, i;
372 uint8_t *ppcm[5] = { 0 };
373
374 if (buf_size < DV_PROFILE_BYTES ||
375 !(c->sys = av_dv_frame_profile(c->sys, buf, buf_size)) ||
376 buf_size < c->sys->frame_size) {
377 return -1; /* Broken frame, or not enough data */
378 }
379
380 /* Queueing audio packet */
381 /* FIXME: in case of no audio/bad audio we have to do something */
382 size = dv_extract_audio_info(c, buf);
383 for (i = 0; i < c->ach; i++) {
384 c->audio_pkt[i].pos = pos;
385 c->audio_pkt[i].size = size;
386 c->audio_pkt[i].pts = c->abytes * 30000 * 8 /
387 c->ast[i]->codec->bit_rate;
388 ppcm[i] = c->audio_buf[i];
389 }
390 if (c->ach)
391 dv_extract_audio(buf, ppcm, c->sys);
392
393 /* We work with 720p frames split in half, thus even frames have
394 * channels 0,1 and odd 2,3. */
395 if (c->sys->height == 720) {
396 if (buf[1] & 0x0C) {
397 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
398 } else {
399 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
400 c->abytes += size;
401 }
402 } else {
403 c->abytes += size;
404 }
405
406 /* Now it's time to return video packet */
407 size = dv_extract_video_info(c, buf);
408 av_init_packet(pkt);
409 pkt->data = buf;
410 pkt->pos = pos;
411 pkt->size = size;
412 pkt->flags |= AV_PKT_FLAG_KEY;
413 pkt->stream_index = c->vst->index;
414 pkt->pts = c->frames;
415
416 c->frames++;
417
418 return size;
419}
420
421static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
422 int64_t timestamp, int flags)
423{
424 // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
425 const AVDVProfile *sys = av_dv_codec_profile(c->vst->codec->width, c->vst->codec->height,
426 c->vst->codec->pix_fmt);
427 int64_t offset;
428 int64_t size = avio_size(s->pb) - s->data_offset;
429 int64_t max_offset = ((size - 1) / sys->frame_size) * sys->frame_size;
430
431 offset = sys->frame_size * timestamp;
432
433 if (size >= 0 && offset > max_offset)
434 offset = max_offset;
435 else if (offset < 0)
436 offset = 0;
437
438 return offset + s->data_offset;
439}
440
441void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
442{
443 c->frames = frame_offset;
444 if (c->ach) {
445 if (c->sys) {
446 c->abytes = av_rescale_q(c->frames, c->sys->time_base,
447 (AVRational) { 8, c->ast[0]->codec->bit_rate });
448 } else
449 av_log(c->fctx, AV_LOG_ERROR, "cannot adjust audio bytes\n");
450 }
451 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
452 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
453}
454
455/************************************************************
456 * Implementation of the easiest DV storage of all -- raw DV.
457 ************************************************************/
458
459typedef struct RawDVContext {
460 DVDemuxContext *dv_demux;
461 uint8_t buf[DV_MAX_FRAME_SIZE];
462} RawDVContext;
463
464static int dv_read_timecode(AVFormatContext *s) {
465 int ret;
466 char timecode[AV_TIMECODE_STR_SIZE];
467 int64_t pos = avio_tell(s->pb);
468
469 // Read 3 DIF blocks: Header block and 2 Subcode blocks.
470 int partial_frame_size = 3 * 80;
471 uint8_t *partial_frame = av_mallocz(sizeof(*partial_frame) *
472 partial_frame_size);
473
474 RawDVContext *c = s->priv_data;
475 ret = avio_read(s->pb, partial_frame, partial_frame_size);
476 if (ret < 0)
477 goto finish;
478
479 if (ret < partial_frame_size) {
480 ret = -1;
481 goto finish;
482 }
483
484 ret = dv_extract_timecode(c->dv_demux, partial_frame, timecode);
485 if (ret)
486 av_dict_set(&s->metadata, "timecode", timecode, 0);
487 else
488 av_log(s, AV_LOG_ERROR, "Detected timecode is invalid\n");
489
490finish:
491 av_free(partial_frame);
492 avio_seek(s->pb, pos, SEEK_SET);
493 return ret;
494}
495
496static int dv_read_header(AVFormatContext *s)
497{
498 unsigned state, marker_pos = 0;
499 RawDVContext *c = s->priv_data;
500
501 c->dv_demux = avpriv_dv_init_demux(s);
502 if (!c->dv_demux)
503 return -1;
504
505 state = avio_rb32(s->pb);
506 while ((state & 0xffffff7f) != 0x1f07003f) {
507 if (avio_feof(s->pb)) {
508 av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
509 return -1;
510 }
511 if (state == 0x003f0700 || state == 0xff3f0700)
512 marker_pos = avio_tell(s->pb);
513 if (state == 0xff3f0701 && avio_tell(s->pb) - marker_pos == 80) {
514 avio_seek(s->pb, -163, SEEK_CUR);
515 state = avio_rb32(s->pb);
516 break;
517 }
518 state = (state << 8) | avio_r8(s->pb);
519 }
520 AV_WB32(c->buf, state);
521
522 if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) != DV_PROFILE_BYTES - 4 ||
523 avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0)
524 return AVERROR(EIO);
525
526 c->dv_demux->sys = av_dv_frame_profile(c->dv_demux->sys,
527 c->buf,
528 DV_PROFILE_BYTES);
529 if (!c->dv_demux->sys) {
530 av_log(s, AV_LOG_ERROR,
531 "Can't determine profile of DV input stream.\n");
532 return -1;
533 }
534
535 s->bit_rate = av_rescale_q(c->dv_demux->sys->frame_size,
536 (AVRational) { 8, 1 },
537 c->dv_demux->sys->time_base);
538
539 if (s->pb->seekable)
540 dv_read_timecode(s);
541
542 return 0;
543}
544
545static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
546{
547 int size;
548 RawDVContext *c = s->priv_data;
549
550 size = avpriv_dv_get_packet(c->dv_demux, pkt);
551
552 if (size < 0) {
553 int64_t pos = avio_tell(s->pb);
554 if (!c->dv_demux->sys)
555 return AVERROR(EIO);
556 size = c->dv_demux->sys->frame_size;
557 if (avio_read(s->pb, c->buf, size) <= 0)
558 return AVERROR(EIO);
559
560 size = avpriv_dv_produce_packet(c->dv_demux, pkt, c->buf, size, pos);
561 }
562
563 return size;
564}
565
566static int dv_read_seek(AVFormatContext *s, int stream_index,
567 int64_t timestamp, int flags)
568{
569 RawDVContext *r = s->priv_data;
570 DVDemuxContext *c = r->dv_demux;
571 int64_t offset = dv_frame_offset(s, c, timestamp, flags);
572
573 if (avio_seek(s->pb, offset, SEEK_SET) < 0)
574 return -1;
575
576 ff_dv_offset_reset(c, offset / c->sys->frame_size);
577 return 0;
578}
579
580static int dv_read_close(AVFormatContext *s)
581{
582 RawDVContext *c = s->priv_data;
583 av_free(c->dv_demux);
584 return 0;
585}
586
587static int dv_probe(AVProbeData *p)
588{
589 unsigned marker_pos = 0;
590 int i;
591 int matches = 0;
592 int firstmatch = 0;
593 int secondary_matches = 0;
594
595 if (p->buf_size < 5)
596 return 0;
597
598 for (i = 0; i < p->buf_size-4; i++) {
599 unsigned state = AV_RB32(p->buf+i);
600 if ((state & 0x0007f840) == 0x00070000) {
601 // any section header, also with seq/chan num != 0,
602 // should appear around every 12000 bytes, at least 10 per frame
603 if ((state & 0xff07ff7f) == 0x1f07003f) {
604 secondary_matches++;
605 if ((state & 0xffffff7f) == 0x1f07003f) {
606 matches++;
607 if (!i)
608 firstmatch = 1;
609 }
610 }
611 if (state == 0x003f0700 || state == 0xff3f0700)
612 marker_pos = i;
613 if (state == 0xff3f0701 && i - marker_pos == 80)
614 matches++;
615 }
616 }
617
618 if (matches && p->buf_size / matches < 1024 * 1024) {
619 if (matches > 4 || firstmatch ||
620 (secondary_matches >= 10 &&
621 p->buf_size / secondary_matches < 24000))
622 // not max to avoid dv in mov to match
623 return AVPROBE_SCORE_MAX * 3 / 4;
624 return AVPROBE_SCORE_MAX / 4;
625 }
626 return 0;
627}
628
629AVInputFormat ff_dv_demuxer = {
630 .name = "dv",
631 .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
632 .priv_data_size = sizeof(RawDVContext),
633 .read_probe = dv_probe,
634 .read_header = dv_read_header,
635 .read_packet = dv_read_packet,
636 .read_close = dv_read_close,
637 .read_seek = dv_read_seek,
638 .extensions = "dv,dif",
639};