summaryrefslogtreecommitdiff
path: root/libavformat/dvenc.c (plain)
blob: 93c103b31655fc47fee238aa9cc6a68904f013aa
1/*
2 * General DV muxer/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) support
12 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
13 *
14 * This file is part of FFmpeg.
15 *
16 * FFmpeg is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU Lesser General Public
18 * License as published by the Free Software Foundation; either
19 * version 2.1 of the License, or (at your option) any later version.
20 *
21 * FFmpeg is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 * Lesser General Public License for more details.
25 *
26 * You should have received a copy of the GNU Lesser General Public
27 * License along with FFmpeg; if not, write to the Free Software
28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 */
30#include <time.h>
31#include <stdarg.h>
32
33#include "avformat.h"
34#include "internal.h"
35#include "libavcodec/dv_profile.h"
36#include "libavcodec/dv.h"
37#include "dv.h"
38#include "libavutil/avassert.h"
39#include "libavutil/fifo.h"
40#include "libavutil/mathematics.h"
41#include "libavutil/intreadwrite.h"
42#include "libavutil/opt.h"
43#include "libavutil/timecode.h"
44
45#define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio
46
47struct DVMuxContext {
48 AVClass *av_class;
49 const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */
50 int n_ast; /* number of stereo audio streams (up to 2) */
51 AVStream *ast[2]; /* stereo audio streams */
52 AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */
53 int frames; /* current frame number */
54 int64_t start_time; /* recording start time */
55 int has_audio; /* frame under construction has audio */
56 int has_video; /* frame under construction has video */
57 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
58 AVTimecode tc; /* timecode context */
59};
60
61static const int dv_aaux_packs_dist[12][9] = {
62 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
63 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
64 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
65 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
66 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
67 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
68 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
69 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
70 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
71 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
72 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
73 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
74};
75
76static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
77{
78 if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
79 if (sample_rate == 32000) return 1280;
80 else if (sample_rate == 44100) return 1764;
81 else return 1920;
82 }
83
84 av_assert0(sample_rate == 48000);
85
86 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
87 sizeof(sys->audio_samples_dist[0]))];
88}
89
90static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
91{
92 struct tm tc;
93 time_t ct;
94 uint32_t timecode;
95 va_list ap;
96 int audio_type = 0;
97 int channel;
98
99 buf[0] = (uint8_t)pack_id;
100 switch (pack_id) {
101 case dv_timecode:
102 timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
103 timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
104 AV_WB32(buf + 1, timecode);
105 break;
106 case dv_audio_source: /* AAUX source pack */
107 va_start(ap, buf);
108 channel = va_arg(ap, int);
109 if (c->ast[channel]->codecpar->sample_rate == 44100) {
110 audio_type = 1;
111 } else if (c->ast[channel]->codecpar->sample_rate == 32000)
112 audio_type = 2;
113 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
114 (1 << 6) | /* reserved -- always 1 */
115 (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
116 c->sys->audio_min_samples[audio_type]);
117 /* # of samples */
118 buf[2] = (0 << 7) | /* multi-stereo */
119 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
120 (0 << 4) | /* pair bit: 0 -- one pair of channels */
121 !!va_arg(ap, int); /* audio mode */
122 buf[3] = (1 << 7) | /* res */
123 (1 << 6) | /* multi-language flag */
124 (c->sys->dsf << 5) | /* system: 60fields/50fields */
125 (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
126 buf[4] = (1 << 7) | /* emphasis: 1 -- off */
127 (0 << 6) | /* emphasis time constant: 0 -- reserved */
128 (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
129 0; /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */
130
131 va_end(ap);
132 break;
133 case dv_audio_control:
134 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
135 (1 << 4) | /* input source: 1 -- digital input */
136 (3 << 2) | /* compression: 3 -- no information */
137 0; /* misc. info/SMPTE emphasis off */
138 buf[2] = (1 << 7) | /* recording start point: 1 -- no */
139 (1 << 6) | /* recording end point: 1 -- no */
140 (1 << 3) | /* recording mode: 1 -- original */
141 7;
142 buf[3] = (1 << 7) | /* direction: 1 -- forward */
143 (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
144 c->sys->ltc_divisor * 4);
145 buf[4] = (1 << 7) | /* reserved -- always 1 */
146 0x7f; /* genre category */
147 break;
148 case dv_audio_recdate:
149 case dv_video_recdate: /* VAUX recording date */
150 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
151 c->sys->time_base.den, AV_ROUND_DOWN);
152 ff_brktimegm(ct, &tc);
153 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
154 /* 0xff is very likely to be "unknown" */
155 buf[2] = (3 << 6) | /* reserved -- always 1 */
156 ((tc.tm_mday / 10) << 4) | /* Tens of day */
157 (tc.tm_mday % 10); /* Units of day */
158 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
159 ((tc.tm_mon / 10) << 4) | /* Tens of month */
160 (tc.tm_mon % 10); /* Units of month */
161 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
162 (tc.tm_year % 10); /* Units of year */
163 break;
164 case dv_audio_rectime: /* AAUX recording time */
165 case dv_video_rectime: /* VAUX recording time */
166 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
167 c->sys->time_base.den, AV_ROUND_DOWN);
168 ff_brktimegm(ct, &tc);
169 buf[1] = (3 << 6) | /* reserved -- always 1 */
170 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
171 buf[2] = (1 << 7) | /* reserved -- always 1 */
172 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
173 (tc.tm_sec % 10); /* Units of seconds */
174 buf[3] = (1 << 7) | /* reserved -- always 1 */
175 ((tc.tm_min / 10) << 4) | /* Tens of minutes */
176 (tc.tm_min % 10); /* Units of minutes */
177 buf[4] = (3 << 6) | /* reserved -- always 1 */
178 ((tc.tm_hour / 10) << 4) | /* Tens of hours */
179 (tc.tm_hour % 10); /* Units of hours */
180 break;
181 default:
182 buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
183 }
184 return 5;
185}
186
187static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
188{
189 int i, j, d, of, size;
190 size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate);
191 frame_ptr += channel * c->sys->difseg_size * 150 * 80;
192 for (i = 0; i < c->sys->difseg_size; i++) {
193 frame_ptr += 6 * 80; /* skip DIF segment header */
194 for (j = 0; j < 9; j++) {
195 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i >= c->sys->difseg_size/2);
196 for (d = 8; d < 80; d+=2) {
197 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
198 if (of*2 >= size)
199 continue;
200
201 frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
202 frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM
203 }
204 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
205 }
206 }
207}
208
209static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
210{
211 int j, k;
212 uint8_t* buf;
213
214 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
215 /* DV subcode: 2nd and 3d DIFs */
216 for (j = 80; j < 80 * 3; j += 80) {
217 for (k = 6; k < 6 * 8; k += 8)
218 dv_write_pack(dv_timecode, c, &buf[j+k]);
219
220 if (((long)(buf-frame)/(c->sys->frame_size/(c->sys->difseg_size*c->sys->n_difchan))%c->sys->difseg_size) > 5) { /* FIXME: is this really needed ? */
221 dv_write_pack(dv_video_recdate, c, &buf[j+14]);
222 dv_write_pack(dv_video_rectime, c, &buf[j+22]);
223 dv_write_pack(dv_video_recdate, c, &buf[j+38]);
224 dv_write_pack(dv_video_rectime, c, &buf[j+46]);
225 }
226 }
227
228 /* DV VAUX: 4th, 5th and 6th 3DIFs */
229 for (j = 80*3 + 3; j < 80*6; j += 80) {
230 dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
231 dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
232 dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
233 dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
234 }
235 }
236}
237
238/*
239 * The following 3 functions constitute our interface to the world
240 */
241
242static int dv_assemble_frame(AVFormatContext *s,
243 DVMuxContext *c, AVStream* st,
244 uint8_t* data, int data_size, uint8_t** frame)
245{
246 int i, reqasize;
247
248 *frame = &c->frame_buf[0];
249
250 switch (st->codecpar->codec_type) {
251 case AVMEDIA_TYPE_VIDEO:
252 /* FIXME: we have to have more sensible approach than this one */
253 if (c->has_video)
254 av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
255 if (data_size != c->sys->frame_size) {
256 av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
257 data_size, c->sys->frame_size);
258 return AVERROR(ENOSYS);
259 }
260
261 memcpy(*frame, data, c->sys->frame_size);
262 c->has_video = 1;
263 break;
264 case AVMEDIA_TYPE_AUDIO:
265 for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
266
267 /* FIXME: we have to have more sensible approach than this one */
268 if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE)
269 av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
270 av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);
271
272 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);
273
274 /* Let us see if we've got enough audio for one DV frame. */
275 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
276
277 break;
278 default:
279 break;
280 }
281
282 /* Let us see if we have enough data to construct one DV frame. */
283 if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
284 dv_inject_metadata(c, *frame);
285 c->has_audio = 0;
286 for (i=0; i < c->n_ast; i++) {
287 dv_inject_audio(c, i, *frame);
288 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
289 av_fifo_drain(c->audio_data[i], reqasize);
290 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
291 }
292
293 c->has_video = 0;
294
295 c->frames++;
296
297 return c->sys->frame_size;
298 }
299
300 return 0;
301}
302
303static DVMuxContext* dv_init_mux(AVFormatContext* s)
304{
305 DVMuxContext *c = s->priv_data;
306 AVStream *vst = NULL;
307 int i;
308
309 /* we support at most 1 video and 2 audio streams */
310 if (s->nb_streams > 3)
311 return NULL;
312
313 c->n_ast = 0;
314 c->ast[0] = c->ast[1] = NULL;
315
316 /* We have to sort out where audio and where video stream is */
317 for (i=0; i<s->nb_streams; i++) {
318 switch (s->streams[i]->codecpar->codec_type) {
319 case AVMEDIA_TYPE_VIDEO:
320 if (vst) return NULL;
321 vst = s->streams[i];
322 break;
323 case AVMEDIA_TYPE_AUDIO:
324 if (c->n_ast > 1) return NULL;
325 c->ast[c->n_ast++] = s->streams[i];
326 break;
327 default:
328 goto bail_out;
329 }
330 }
331
332 /* Some checks -- DV format is very picky about its incoming streams */
333 if (!vst || vst->codecpar->codec_id != AV_CODEC_ID_DVVIDEO)
334 goto bail_out;
335 for (i=0; i<c->n_ast; i++) {
336 if (c->ast[i]) {
337 if(c->ast[i]->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE ||
338 c->ast[i]->codecpar->channels != 2)
339 goto bail_out;
340 if (c->ast[i]->codecpar->sample_rate != 48000 &&
341 c->ast[i]->codecpar->sample_rate != 44100 &&
342 c->ast[i]->codecpar->sample_rate != 32000 )
343 goto bail_out;
344 }
345 }
346 c->sys = av_dv_codec_profile2(vst->codecpar->width, vst->codecpar->height,
347 vst->codecpar->format, vst->time_base);
348 if (!c->sys)
349 goto bail_out;
350
351 if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
352 if (c->ast[0] && c->ast[0]->codecpar->sample_rate != 48000)
353 goto bail_out;
354 if (c->ast[1] && c->ast[1]->codecpar->sample_rate != 48000)
355 goto bail_out;
356 }
357
358 if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
359 /* only 1 stereo pair is allowed in 25Mbps mode */
360 goto bail_out;
361 }
362
363 /* Ok, everything seems to be in working order */
364 c->frames = 0;
365 c->has_audio = 0;
366 c->has_video = 0;
367 ff_parse_creation_time_metadata(s, &c->start_time, 1);
368
369 for (i=0; i < c->n_ast; i++) {
370 if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) {
371 while (i > 0) {
372 i--;
373 av_fifo_freep(&c->audio_data[i]);
374 }
375 goto bail_out;
376 }
377 }
378
379 return c;
380
381bail_out:
382 return NULL;
383}
384
385static void dv_delete_mux(DVMuxContext *c)
386{
387 int i;
388 for (i=0; i < c->n_ast; i++)
389 av_fifo_freep(&c->audio_data[i]);
390}
391
392static int dv_write_header(AVFormatContext *s)
393{
394 AVRational rate;
395 DVMuxContext *dvc = s->priv_data;
396 AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
397
398 if (!dv_init_mux(s)) {
399 av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
400 "Make sure that you supply exactly two streams:\n"
401 " video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
402 " (50Mbps allows an optional second audio stream)\n");
403 return -1;
404 }
405 rate.num = dvc->sys->ltc_divisor;
406 rate.den = 1;
407 if (!tcr) { // no global timecode, look into the streams
408 int i;
409 for (i = 0; i < s->nb_streams; i++) {
410 tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
411 if (tcr)
412 break;
413 }
414 }
415 if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
416 return 0;
417 return av_timecode_init(&dvc->tc, rate, 0, 0, s);
418}
419
420static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
421{
422 uint8_t* frame;
423 int fsize;
424
425 fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
426 pkt->data, pkt->size, &frame);
427 if (fsize > 0) {
428 avio_write(s->pb, frame, fsize);
429 }
430 return 0;
431}
432
433/*
434 * We might end up with some extra A/V data without matching counterpart.
435 * E.g. video data without enough audio to write the complete frame.
436 * Currently we simply drop the last frame. I don't know whether this
437 * is the best strategy of all
438 */
439static int dv_write_trailer(struct AVFormatContext *s)
440{
441 dv_delete_mux(s->priv_data);
442 return 0;
443}
444
445AVOutputFormat ff_dv_muxer = {
446 .name = "dv",
447 .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
448 .extensions = "dv",
449 .priv_data_size = sizeof(DVMuxContext),
450 .audio_codec = AV_CODEC_ID_PCM_S16LE,
451 .video_codec = AV_CODEC_ID_DVVIDEO,
452 .write_header = dv_write_header,
453 .write_packet = dv_write_packet,
454 .write_trailer = dv_write_trailer,
455};
456
generated by cgit at 2024-05-17 03:43:24 (GMT)