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#include "avformat.h" 33#include "libavcodec/dvdata.h" 34#include "dv.h" 35#include "libavutil/fifo.h" 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 */ 41 AVFifoBuffer audio_data[2]; /* FIFO for storing excessive amounts of PCM */ 42 int frames; /* current frame number */ 43 time_t start_time; /* recording start time */ 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 70static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...) 71{ 72 struct tm tc; 73 time_t ct; 74 int ltc_frame; 75 va_list ap; 76 77 buf[0] = (uint8_t)pack_id; 78 switch (pack_id) { 79 case dv_timecode: 80 ct = (time_t)av_rescale_rnd(c->frames, c->sys->time_base.num, 81 c->sys->time_base.den, AV_ROUND_DOWN); 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 frame: 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 */ 104 va_start(ap, buf); 105 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */ 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 */ 113 !!va_arg(ap, int); /* audio mode */ 114 buf[3] = (1 << 7) | /* res */ 115 (1 << 6) | /* multi-language flag */ 116 (c->sys->dsf << 5) | /* system: 60fields/50fields */ 117 (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */ 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 */ 122 va_end(ap); 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 */ 134 (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */ 135 c->sys->ltc_divisor * 4); 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 + av_rescale_rnd(c->frames, c->sys->time_base.num, 142 c->sys->time_base.den, AV_ROUND_DOWN); 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 + av_rescale_rnd(c->frames, c->sys->time_base.num, 158 c->sys->time_base.den, AV_ROUND_DOWN); 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++) { 186 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2); 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; 191 192 frame_ptr[d] = av_fifo_peek(&c->audio_data[channel], of*2+1); // FIXME: maybe 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 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 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 */ 254 if (av_fifo_size(&c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) 255 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); 256 av_fifo_generic_write(&c->audio_data[i], data, data_size, NULL); 257 258 /* Let us see if we've got enough audio for one DV frame. */ 259 c->has_audio |= ((reqasize <= av_fifo_size(&c->audio_data[i])) << i); 260 261 break; 262 default: 263 break; 264 } 265 266 /* Let us 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); 269 c->has_audio = 0; 270 for (i=0; i < c->n_ast; i++) { 271 dv_inject_audio(c, i, *frame); 272 av_fifo_drain(&c->audio_data[i], reqasize); 273 c->has_audio |= ((reqasize <= av_fifo_size(&c->audio_data[i])) << i); 274 } 275 276 c->has_video = 0; 277 278 c->frames++; 279 280 return c->sys->frame_size; 281 } 282 283 return 0; 284} 285 286DVMuxContext* dv_init_mux(AVFormatContext* s) 287{ 288 DVMuxContext *c = s->priv_data; 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; 295 296 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: 303 if (vst) return NULL; 304 vst = s->streams[i]; 305 break; 306 case CODEC_TYPE_AUDIO: 307 if (c->n_ast > 1) return NULL; 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++) { 340 if (c->ast[i] && av_fifo_init(&c->audio_data[i], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) { 341 while (i > 0) { 342 i--; 343 av_fifo_free(&c->audio_data[i]); 344 } 345 goto bail_out; 346 } 347 } 348 349 return c; 350 351bail_out: 352 return NULL; 353} 354 355void dv_delete_mux(DVMuxContext *c) 356{ 357 int i; 358 for (i=0; i < c->n_ast; i++) 359 av_fifo_free(&c->audio_data[i]); 360} 361 362#if CONFIG_DV_MUXER 363static int dv_write_header(AVFormatContext *s) 364{ 365 if (!dv_init_mux(s)) { 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; 379 380 fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index], 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{ 397 dv_delete_mux(s->priv_data); 398 return 0; 399} 400 401AVOutputFormat dv_muxer = { 402 "dv", 403 NULL_IF_CONFIG_SMALL("DV video format"), 404 NULL, 405 "dv", 406 sizeof(DVMuxContext), 407 CODEC_ID_PCM_S16LE, 408 CODEC_ID_DVVIDEO, 409 dv_write_header, 410 dv_write_packet, 411 dv_write_trailer, 412}; 413#endif /* CONFIG_DV_MUXER */ 414