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/fifo.h" 39#include "libavutil/mathematics.h" 40#include "libavutil/intreadwrite.h" 41#include "libavutil/opt.h" 42#include "libavutil/timecode.h" 43 44#define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio 45 46struct DVMuxContext { 47 AVClass *av_class; 48 const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */ 49 int n_ast; /* number of stereo audio streams (up to 2) */ 50 AVStream *ast[2]; /* stereo audio streams */ 51 AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */ 52 int frames; /* current frame number */ 53 int64_t start_time; /* recording start time */ 54 int has_audio; /* frame under construction has audio */ 55 int has_video; /* frame under construction has video */ 56 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */ 57 AVTimecode tc; /* timecode context */ 58}; 59 60static const int dv_aaux_packs_dist[12][9] = { 61 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 62 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 63 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 64 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 65 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 66 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 67 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 68 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 69 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 70 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 71 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 72 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 73}; 74 75static int dv_audio_frame_size(const AVDVProfile* sys, int frame) 76{ 77 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) / 78 sizeof(sys->audio_samples_dist[0]))]; 79} 80 81static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...) 82{ 83 struct tm tc; 84 time_t ct; 85 uint32_t timecode; 86 va_list ap; 87 88 buf[0] = (uint8_t)pack_id; 89 switch (pack_id) { 90 case dv_timecode: 91 timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames); 92 timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags 93 AV_WB32(buf + 1, timecode); 94 break; 95 case dv_audio_source: /* AAUX source pack */ 96 va_start(ap, buf); 97 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */ 98 (1 << 6) | /* reserved -- always 1 */ 99 (dv_audio_frame_size(c->sys, c->frames) - 100 c->sys->audio_min_samples[0]); 101 /* # of samples */ 102 buf[2] = (0 << 7) | /* multi-stereo */ 103 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */ 104 (0 << 4) | /* pair bit: 0 -- one pair of channels */ 105 !!va_arg(ap, int); /* audio mode */ 106 buf[3] = (1 << 7) | /* res */ 107 (1 << 6) | /* multi-language flag */ 108 (c->sys->dsf << 5) | /* system: 60fields/50fields */ 109 (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */ 110 buf[4] = (1 << 7) | /* emphasis: 1 -- off */ 111 (0 << 6) | /* emphasis time constant: 0 -- reserved */ 112 (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */ 113 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */ 114 va_end(ap); 115 break; 116 case dv_audio_control: 117 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */ 118 (1 << 4) | /* input source: 1 -- digital input */ 119 (3 << 2) | /* compression: 3 -- no information */ 120 0; /* misc. info/SMPTE emphasis off */ 121 buf[2] = (1 << 7) | /* recording start point: 1 -- no */ 122 (1 << 6) | /* recording end point: 1 -- no */ 123 (1 << 3) | /* recording mode: 1 -- original */ 124 7; 125 buf[3] = (1 << 7) | /* direction: 1 -- forward */ 126 (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */ 127 c->sys->ltc_divisor * 4); 128 buf[4] = (1 << 7) | /* reserved -- always 1 */ 129 0x7f; /* genre category */ 130 break; 131 case dv_audio_recdate: 132 case dv_video_recdate: /* VAUX recording date */ 133 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, 134 c->sys->time_base.den, AV_ROUND_DOWN); 135 ff_brktimegm(ct, &tc); 136 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */ 137 /* 0xff is very likely to be "unknown" */ 138 buf[2] = (3 << 6) | /* reserved -- always 1 */ 139 ((tc.tm_mday / 10) << 4) | /* Tens of day */ 140 (tc.tm_mday % 10); /* Units of day */ 141 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */ 142 ((tc.tm_mon / 10) << 4) | /* Tens of month */ 143 (tc.tm_mon % 10); /* Units of month */ 144 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */ 145 (tc.tm_year % 10); /* Units of year */ 146 break; 147 case dv_audio_rectime: /* AAUX recording time */ 148 case dv_video_rectime: /* VAUX recording time */ 149 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, 150 c->sys->time_base.den, AV_ROUND_DOWN); 151 ff_brktimegm(ct, &tc); 152 buf[1] = (3 << 6) | /* reserved -- always 1 */ 153 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */ 154 buf[2] = (1 << 7) | /* reserved -- always 1 */ 155 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */ 156 (tc.tm_sec % 10); /* Units of seconds */ 157 buf[3] = (1 << 7) | /* reserved -- always 1 */ 158 ((tc.tm_min / 10) << 4) | /* Tens of minutes */ 159 (tc.tm_min % 10); /* Units of minutes */ 160 buf[4] = (3 << 6) | /* reserved -- always 1 */ 161 ((tc.tm_hour / 10) << 4) | /* Tens of hours */ 162 (tc.tm_hour % 10); /* Units of hours */ 163 break; 164 default: 165 buf[1] = buf[2] = buf[3] = buf[4] = 0xff; 166 } 167 return 5; 168} 169 170static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr) 171{ 172 int i, j, d, of, size; 173 size = 4 * dv_audio_frame_size(c->sys, c->frames); 174 frame_ptr += channel * c->sys->difseg_size * 150 * 80; 175 for (i = 0; i < c->sys->difseg_size; i++) { 176 frame_ptr += 6 * 80; /* skip DIF segment header */ 177 for (j = 0; j < 9; j++) { 178 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2); 179 for (d = 8; d < 80; d+=2) { 180 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride; 181 if (of*2 >= size) 182 continue; 183 184 frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit 185 frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM 186 } 187 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */ 188 } 189 } 190} 191 192static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame) 193{ 194 int j, k; 195 uint8_t* buf; 196 197 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) { 198 /* DV subcode: 2nd and 3d DIFs */ 199 for (j = 80; j < 80 * 3; j += 80) { 200 for (k = 6; k < 6 * 8; k += 8) 201 dv_write_pack(dv_timecode, c, &buf[j+k]); 202 203 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 ? */ 204 dv_write_pack(dv_video_recdate, c, &buf[j+14]); 205 dv_write_pack(dv_video_rectime, c, &buf[j+22]); 206 dv_write_pack(dv_video_recdate, c, &buf[j+38]); 207 dv_write_pack(dv_video_rectime, c, &buf[j+46]); 208 } 209 } 210 211 /* DV VAUX: 4th, 5th and 6th 3DIFs */ 212 for (j = 80*3 + 3; j < 80*6; j += 80) { 213 dv_write_pack(dv_video_recdate, c, &buf[j+5*2]); 214 dv_write_pack(dv_video_rectime, c, &buf[j+5*3]); 215 dv_write_pack(dv_video_recdate, c, &buf[j+5*11]); 216 dv_write_pack(dv_video_rectime, c, &buf[j+5*12]); 217 } 218 } 219} 220 221/* 222 * The following 3 functions constitute our interface to the world 223 */ 224 225static int dv_assemble_frame(DVMuxContext *c, AVStream* st, 226 uint8_t* data, int data_size, uint8_t** frame) 227{ 228 int i, reqasize; 229 230 *frame = &c->frame_buf[0]; 231 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames); 232 233 switch (st->codec->codec_type) { 234 case AVMEDIA_TYPE_VIDEO: 235 /* FIXME: we have to have more sensible approach than this one */ 236 if (c->has_video) 237 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames); 238 239 memcpy(*frame, data, c->sys->frame_size); 240 c->has_video = 1; 241 break; 242 case AVMEDIA_TYPE_AUDIO: 243 for (i = 0; i < c->n_ast && st != c->ast[i]; i++); 244 245 /* FIXME: we have to have more sensible approach than this one */ 246 if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE) 247 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); 248 av_fifo_generic_write(c->audio_data[i], data, data_size, NULL); 249 250 /* Let us see if we've got enough audio for one DV frame. */ 251 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); 252 253 break; 254 default: 255 break; 256 } 257 258 /* Let us see if we have enough data to construct one DV frame. */ 259 if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) { 260 dv_inject_metadata(c, *frame); 261 c->has_audio = 0; 262 for (i=0; i < c->n_ast; i++) { 263 dv_inject_audio(c, i, *frame); 264 av_fifo_drain(c->audio_data[i], reqasize); 265 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); 266 } 267 268 c->has_video = 0; 269 270 c->frames++; 271 272 return c->sys->frame_size; 273 } 274 275 return 0; 276} 277 278static DVMuxContext* dv_init_mux(AVFormatContext* s) 279{ 280 DVMuxContext *c = s->priv_data; 281 AVStream *vst = NULL; 282 AVDictionaryEntry *t; 283 int i; 284 285 /* we support at most 1 video and 2 audio streams */ 286 if (s->nb_streams > 3) 287 return NULL; 288 289 c->n_ast = 0; 290 c->ast[0] = c->ast[1] = NULL; 291 292 /* We have to sort out where audio and where video stream is */ 293 for (i=0; i<s->nb_streams; i++) { 294 switch (s->streams[i]->codec->codec_type) { 295 case AVMEDIA_TYPE_VIDEO: 296 if (vst) return NULL; 297 vst = s->streams[i]; 298 break; 299 case AVMEDIA_TYPE_AUDIO: 300 if (c->n_ast > 1) return NULL; 301 c->ast[c->n_ast++] = s->streams[i]; 302 break; 303 default: 304 goto bail_out; 305 } 306 } 307 308 /* Some checks -- DV format is very picky about its incoming streams */ 309 if (!vst || vst->codec->codec_id != AV_CODEC_ID_DVVIDEO) 310 goto bail_out; 311 for (i=0; i<c->n_ast; i++) { 312 if (c->ast[i] && (c->ast[i]->codec->codec_id != AV_CODEC_ID_PCM_S16LE || 313 c->ast[i]->codec->sample_rate != 48000 || 314 c->ast[i]->codec->channels != 2)) 315 goto bail_out; 316 } 317 c->sys = av_dv_codec_profile(vst->codec->width, vst->codec->height, vst->codec->pix_fmt); 318 if (!c->sys) 319 goto bail_out; 320 321 if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) { 322 /* only 1 stereo pair is allowed in 25Mbps mode */ 323 goto bail_out; 324 } 325 326 /* Ok, everything seems to be in working order */ 327 c->frames = 0; 328 c->has_audio = 0; 329 c->has_video = 0; 330 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) 331 c->start_time = ff_iso8601_to_unix_time(t->value); 332 333 for (i=0; i < c->n_ast; i++) { 334 if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) { 335 while (i > 0) { 336 i--; 337 av_fifo_freep(&c->audio_data[i]); 338 } 339 goto bail_out; 340 } 341 } 342 343 return c; 344 345bail_out: 346 return NULL; 347} 348 349static void dv_delete_mux(DVMuxContext *c) 350{ 351 int i; 352 for (i=0; i < c->n_ast; i++) 353 av_fifo_freep(&c->audio_data[i]); 354} 355 356static int dv_write_header(AVFormatContext *s) 357{ 358 AVRational rate; 359 DVMuxContext *dvc = s->priv_data; 360 AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0); 361 362 if (!dv_init_mux(s)) { 363 av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n" 364 "Make sure that you supply exactly two streams:\n" 365 " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n" 366 " (50Mbps allows an optional second audio stream)\n"); 367 return -1; 368 } 369 rate.num = dvc->sys->ltc_divisor; 370 rate.den = 1; 371 if (!tcr) { // no global timecode, look into the streams 372 int i; 373 for (i = 0; i < s->nb_streams; i++) { 374 tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0); 375 if (tcr) 376 break; 377 } 378 } 379 if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0) 380 return 0; 381 return av_timecode_init(&dvc->tc, rate, 0, 0, s); 382} 383 384static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt) 385{ 386 uint8_t* frame; 387 int fsize; 388 389 fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index], 390 pkt->data, pkt->size, &frame); 391 if (fsize > 0) { 392 avio_write(s->pb, frame, fsize); 393 } 394 return 0; 395} 396 397/* 398 * We might end up with some extra A/V data without matching counterpart. 399 * E.g. video data without enough audio to write the complete frame. 400 * Currently we simply drop the last frame. I don't know whether this 401 * is the best strategy of all 402 */ 403static int dv_write_trailer(struct AVFormatContext *s) 404{ 405 dv_delete_mux(s->priv_data); 406 return 0; 407} 408 409AVOutputFormat ff_dv_muxer = { 410 .name = "dv", 411 .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), 412 .extensions = "dv", 413 .priv_data_size = sizeof(DVMuxContext), 414 .audio_codec = AV_CODEC_ID_PCM_S16LE, 415 .video_codec = AV_CODEC_ID_DVVIDEO, 416 .write_header = dv_write_header, 417 .write_packet = dv_write_packet, 418 .write_trailer = dv_write_trailer, 419}; 420