DV muxer should not only fail for more that 3 streams altogether
[libav.git] / libavformat / dvenc.c
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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 *
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14 * This file is part of FFmpeg.
15 *
16 * FFmpeg is free software; you can redistribute it and/or
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17 * modify it under the terms of the GNU Lesser General Public
18 * License as published by the Free Software Foundation; either
b78e7197 19 * version 2.1 of the License, or (at your option) any later version.
d4fc91b4 20 *
b78e7197 21 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 27 * License along with FFmpeg; if not, write to the Free Software
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28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 */
30#include <time.h>
e950141a 31#include <stdarg.h>
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32#include "avformat.h"
33#include "dvdata.h"
34#include "dv.h"
f5a478f6 35#include "fifo.h"
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36
37struct DVMuxContext {
38 const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
39 int n_ast; /* Number of stereo audio streams (up to 2) */
40 AVStream *ast[2]; /* Stereo audio streams */
f5a478f6 41 AVFifoBuffer audio_data[2]; /* Fifo for storing excessive amounts of PCM */
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42 int frames; /* Number of a current frame */
43 time_t start_time; /* Start time of recording */
44 int has_audio; /* frame under contruction has audio */
45 int has_video; /* frame under contruction has video */
46 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */
47};
48
49static const int dv_aaux_packs_dist[12][9] = {
50 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
51 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
52 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
53 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
54 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
55 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
56 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
57 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
58 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
59 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
60 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
61 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
62};
63
64static int dv_audio_frame_size(const DVprofile* sys, int frame)
65{
66 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
67 sizeof(sys->audio_samples_dist[0]))];
68}
69
e950141a 70static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
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71{
72 struct tm tc;
73 time_t ct;
74 int ltc_frame;
e950141a 75 va_list ap;
d4fc91b4 76
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77 buf[0] = (uint8_t)pack_id;
78 switch (pack_id) {
79 case dv_timecode:
80 ct = (time_t)(c->frames / ((float)c->sys->frame_rate /
81 (float)c->sys->frame_rate_base));
82 brktimegm(ct, &tc);
83 /*
84 * LTC drop-frame frame counter drops two frames (0 and 1) every
85 * minute, unless it is exactly divisible by 10
86 */
87 ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
88 buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
89 (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
90 ((ltc_frame / 10) << 4) | /* Tens of frames */
91 (ltc_frame % 10); /* Units of frames */
92 buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
93 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
94 (tc.tm_sec % 10); /* Units of seconds */
95 buf[3] = (1 << 7) | /* Binary group flag BGF0 */
96 ((tc.tm_min / 10) << 4) | /* Tens of minutes */
97 (tc.tm_min % 10); /* Units of minutes */
98 buf[4] = (1 << 7) | /* Binary group flag BGF2 */
99 (1 << 6) | /* Binary group flag BGF1 */
100 ((tc.tm_hour / 10) << 4) | /* Tens of hours */
101 (tc.tm_hour % 10); /* Units of hours */
102 break;
103 case dv_audio_source: /* AAUX source pack */
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104 va_start(ap, buf);
105 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
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106 (1 << 6) | /* reserved -- always 1 */
107 (dv_audio_frame_size(c->sys, c->frames) -
108 c->sys->audio_min_samples[0]);
109 /* # of samples */
110 buf[2] = (0 << 7) | /* multi-stereo */
111 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
112 (0 << 4) | /* pair bit: 0 -- one pair of channels */
e950141a 113 !!va_arg(ap, int); /* audio mode */
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114 buf[3] = (1 << 7) | /* res */
115 (1 << 6) | /* multi-language flag */
116 (c->sys->dsf << 5) | /* system: 60fields/50fields */
d1bc38f3 117 (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
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118 buf[4] = (1 << 7) | /* emphasis: 1 -- off */
119 (0 << 6) | /* emphasis time constant: 0 -- reserved */
120 (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
121 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
e950141a 122 va_end(ap);
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123 break;
124 case dv_audio_control:
125 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
126 (1 << 4) | /* input source: 1 -- digital input */
127 (3 << 2) | /* compression: 3 -- no information */
128 0; /* misc. info/SMPTE emphasis off */
129 buf[2] = (1 << 7) | /* recording start point: 1 -- no */
130 (1 << 6) | /* recording end point: 1 -- no */
131 (1 << 3) | /* recording mode: 1 -- original */
132 7;
133 buf[3] = (1 << 7) | /* direction: 1 -- forward */
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134 (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */
135 c->sys->ltc_divisor*4);
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136 buf[4] = (1 << 7) | /* reserved -- always 1 */
137 0x7f; /* genre category */
138 break;
139 case dv_audio_recdate:
140 case dv_video_recdate: /* VAUX recording date */
141 ct = c->start_time + (time_t)(c->frames /
142 ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
143 brktimegm(ct, &tc);
144 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
145 /* 0xff is very likely to be "unknown" */
146 buf[2] = (3 << 6) | /* reserved -- always 1 */
147 ((tc.tm_mday / 10) << 4) | /* Tens of day */
148 (tc.tm_mday % 10); /* Units of day */
149 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
150 ((tc.tm_mon / 10) << 4) | /* Tens of month */
151 (tc.tm_mon % 10); /* Units of month */
152 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
153 (tc.tm_year % 10); /* Units of year */
154 break;
155 case dv_audio_rectime: /* AAUX recording time */
156 case dv_video_rectime: /* VAUX recording time */
157 ct = c->start_time + (time_t)(c->frames /
158 ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
159 brktimegm(ct, &tc);
160 buf[1] = (3 << 6) | /* reserved -- always 1 */
161 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
162 buf[2] = (1 << 7) | /* reserved -- always 1 */
163 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
164 (tc.tm_sec % 10); /* Units of seconds */
165 buf[3] = (1 << 7) | /* reserved -- always 1 */
166 ((tc.tm_min / 10) << 4) | /* Tens of minutes */
167 (tc.tm_min % 10); /* Units of minutes */
168 buf[4] = (3 << 6) | /* reserved -- always 1 */
169 ((tc.tm_hour / 10) << 4) | /* Tens of hours */
170 (tc.tm_hour % 10); /* Units of hours */
171 break;
172 default:
173 buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
174 }
175 return 5;
176}
177
178static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
179{
180 int i, j, d, of, size;
181 size = 4 * dv_audio_frame_size(c->sys, c->frames);
182 frame_ptr += channel * c->sys->difseg_size * 150 * 80;
183 for (i = 0; i < c->sys->difseg_size; i++) {
184 frame_ptr += 6 * 80; /* skip DIF segment header */
185 for (j = 0; j < 9; j++) {
e950141a 186 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2);
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187 for (d = 8; d < 80; d+=2) {
188 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
189 if (of*2 >= size)
190 continue;
191
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192 frame_ptr[d] = av_fifo_peek(&c->audio_data[channel], of*2+1); // FIXME: may be we have to admit
193 frame_ptr[d+1] = av_fifo_peek(&c->audio_data[channel], of*2); // that DV is a big endian PCM
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194 }
195 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
196 }
197 }
198}
199
200static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
201{
202 int j, k;
203 uint8_t* buf;
204
205 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
206 /* DV subcode: 2nd and 3d DIFs */
207 for (j = 80; j < 80 * 3; j += 80) {
208 for (k = 6; k < 6 * 8; k += 8)
209 dv_write_pack(dv_timecode, c, &buf[j+k]);
210
211 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 ? */
212 dv_write_pack(dv_video_recdate, c, &buf[j+14]);
213 dv_write_pack(dv_video_rectime, c, &buf[j+22]);
214 dv_write_pack(dv_video_recdate, c, &buf[j+38]);
215 dv_write_pack(dv_video_rectime, c, &buf[j+46]);
216 }
217 }
218
219 /* DV VAUX: 4th, 5th and 6th 3DIFs */
220 for (j = 80*3 + 3; j < 80*6; j += 80) {
221 dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
222 dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
223 dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
224 dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
225 }
226 }
227}
228
229/*
230 * The following 3 functions constitute our interface to the world
231 */
232
233int dv_assemble_frame(DVMuxContext *c, AVStream* st,
234 const uint8_t* data, int data_size, uint8_t** frame)
235{
236 int i, reqasize;
237
238 *frame = &c->frame_buf[0];
239 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
240
241 switch (st->codec->codec_type) {
242 case CODEC_TYPE_VIDEO:
243 /* FIXME: we have to have more sensible approach than this one */
244 if (c->has_video)
245 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
246
247 memcpy(*frame, data, c->sys->frame_size);
248 c->has_video = 1;
249 break;
250 case CODEC_TYPE_AUDIO:
251 for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
252
253 /* FIXME: we have to have more sensible approach than this one */
f5a478f6 254 if (av_fifo_size(&c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
d4fc91b4 255 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
f5a478f6 256 av_fifo_write(&c->audio_data[i], data, data_size);
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257
258 /* Lets see if we've got enough audio for one DV frame */
f5a478f6 259 c->has_audio |= ((reqasize <= av_fifo_size(&c->audio_data[i])) << i);
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260
261 break;
262 default:
263 break;
264 }
265
266 /* Lets see if we have enough data to construct one DV frame */
267 if (c->has_video == 1 && c->has_audio + 1 == 1<<c->n_ast) {
268 dv_inject_metadata(c, *frame);
2e374f12 269 c->has_audio = 0;
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270 for (i=0; i<c->n_ast; i++) {
271 dv_inject_audio(c, i, *frame);
f5a478f6 272 av_fifo_drain(&c->audio_data[i], reqasize);
2e374f12 273 c->has_audio |= ((reqasize <= av_fifo_size(&c->audio_data[i])) << i);
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274 }
275
276 c->has_video = 0;
2e374f12 277
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278 c->frames++;
279
280 return c->sys->frame_size;
281 }
282
283 return 0;
284}
285
286DVMuxContext* dv_init_mux(AVFormatContext* s)
287{
e4141433 288 DVMuxContext *c = s->priv_data;
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289 AVStream *vst = NULL;
290 int i;
291
292 /* we support at most 1 video and 2 audio streams */
293 if (s->nb_streams > 3)
294 return NULL;
295
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296 c->n_ast = 0;
297 c->ast[0] = c->ast[1] = NULL;
298
299 /* We have to sort out where audio and where video stream is */
300 for (i=0; i<s->nb_streams; i++) {
301 switch (s->streams[i]->codec->codec_type) {
302 case CODEC_TYPE_VIDEO:
01fa74ad 303 if (vst) return NULL;
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304 vst = s->streams[i];
305 break;
306 case CODEC_TYPE_AUDIO:
01fa74ad 307 if (c->n_ast > 1) return NULL;
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308 c->ast[c->n_ast++] = s->streams[i];
309 break;
310 default:
311 goto bail_out;
312 }
313 }
314
315 /* Some checks -- DV format is very picky about its incoming streams */
316 if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO)
317 goto bail_out;
318 for (i=0; i<c->n_ast; i++) {
319 if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE ||
320 c->ast[i]->codec->sample_rate != 48000 ||
321 c->ast[i]->codec->channels != 2))
322 goto bail_out;
323 }
324 c->sys = dv_codec_profile(vst->codec);
325 if (!c->sys)
326 goto bail_out;
327
328 if((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
329 /* only 1 stereo pair is allowed in 25Mbps mode */
330 goto bail_out;
331 }
332
333 /* Ok, everything seems to be in working order */
334 c->frames = 0;
335 c->has_audio = 0;
336 c->has_video = 0;
337 c->start_time = (time_t)s->timestamp;
338
339 for (i=0; i<c->n_ast; i++) {
f5a478f6 340 if (c->ast[i] && av_fifo_init(&c->audio_data[i], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) {
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341 while (i>0) {
342 i--;
f5a478f6 343 av_fifo_free(&c->audio_data[i]);
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344 }
345 goto bail_out;
346 }
347 }
348
349 return c;
350
351bail_out:
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352 return NULL;
353}
354
355void dv_delete_mux(DVMuxContext *c)
356{
357 int i;
358 for (i=0; i < c->n_ast; i++)
f5a478f6 359 av_fifo_free(&c->audio_data[i]);
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360}
361
362#ifdef CONFIG_MUXERS
363static int dv_write_header(AVFormatContext *s)
364{
0008afc5 365 if (!dv_init_mux(s)) {
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366 av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
367 "Make sure that you supply exactly two streams:\n"
368 " video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n"
369 " (50Mbps allows an optional second audio stream)\n");
370 return -1;
371 }
372 return 0;
373}
374
375static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
376{
377 uint8_t* frame;
378 int fsize;
379
e4141433 380 fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index],
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381 pkt->data, pkt->size, &frame);
382 if (fsize > 0) {
383 put_buffer(&s->pb, frame, fsize);
384 put_flush_packet(&s->pb);
385 }
386 return 0;
387}
388
389/*
390 * We might end up with some extra A/V data without matching counterpart.
391 * E.g. video data without enough audio to write the complete frame.
392 * Currently we simply drop the last frame. I don't know whether this
393 * is the best strategy of all
394 */
395static int dv_write_trailer(struct AVFormatContext *s)
396{
e4141433 397 dv_delete_mux(s->priv_data);
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398 return 0;
399}
400#endif /* CONFIG_MUXERS */
401
402#ifdef CONFIG_DV_MUXER
403AVOutputFormat dv_muxer = {
404 "dv",
405 "DV video format",
406 NULL,
407 "dv",
408 sizeof(DVMuxContext),
409 CODEC_ID_PCM_S16LE,
410 CODEC_ID_DVVIDEO,
411 dv_write_header,
412 dv_write_packet,
413 dv_write_trailer,
414};
415#endif