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 Libav. 15 * 16 * Libav 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 * Libav 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 Libav; 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/dvdata.h" 36#include "dv.h" 37#include "libavutil/fifo.h" 38#include "libavutil/mathematics.h" 39 40struct DVMuxContext { 41 const DVprofile* sys; /* current DV profile, e.g.: 525/60, 625/50 */ 42 int n_ast; /* number of stereo audio streams (up to 2) */ 43 AVStream *ast[2]; /* stereo audio streams */ 44 AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */ 45 int frames; /* current frame number */ 46 int64_t start_time; /* recording start time */ 47 int has_audio; /* frame under contruction has audio */ 48 int has_video; /* frame under contruction has video */ 49 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */ 50}; 51 52static const int dv_aaux_packs_dist[12][9] = { 53 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 54 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 55 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 56 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 57 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 58 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 59 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 60 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 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}; 66 67static int dv_audio_frame_size(const DVprofile* sys, int frame) 68{ 69 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) / 70 sizeof(sys->audio_samples_dist[0]))]; 71} 72 73static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...) 74{ 75 struct tm tc; 76 time_t ct; 77 int ltc_frame; 78 va_list ap; 79 80 buf[0] = (uint8_t)pack_id; 81 switch (pack_id) { 82 case dv_timecode: 83 ct = (time_t)av_rescale_rnd(c->frames, c->sys->time_base.num, 84 c->sys->time_base.den, AV_ROUND_DOWN); 85 brktimegm(ct, &tc); 86 /* 87 * LTC drop-frame frame counter drops two frames (0 and 1) every 88 * minute, unless it is exactly divisible by 10 89 */ 90 ltc_frame = (c->frames + 2 * ct / 60 - 2 * ct / 600) % c->sys->ltc_divisor; 91 buf[1] = (0 << 7) | /* color frame: 0 - unsync; 1 - sync mode */ 92 (1 << 6) | /* drop frame timecode: 0 - nondrop; 1 - drop */ 93 ((ltc_frame / 10) << 4) | /* tens of frames */ 94 (ltc_frame % 10); /* units of frames */ 95 buf[2] = (1 << 7) | /* biphase mark polarity correction: 0 - even; 1 - odd */ 96 ((tc.tm_sec / 10) << 4) | /* tens of seconds */ 97 (tc.tm_sec % 10); /* units of seconds */ 98 buf[3] = (1 << 7) | /* binary group flag BGF0 */ 99 ((tc.tm_min / 10) << 4) | /* tens of minutes */ 100 (tc.tm_min % 10); /* units of minutes */ 101 buf[4] = (1 << 7) | /* binary group flag BGF2 */ 102 (1 << 6) | /* binary group flag BGF1 */ 103 ((tc.tm_hour / 10) << 4) | /* tens of hours */ 104 (tc.tm_hour % 10); /* units of hours */ 105 break; 106 case dv_audio_source: /* AAUX source pack */ 107 va_start(ap, buf); 108 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */ 109 (1 << 6) | /* reserved -- always 1 */ 110 (dv_audio_frame_size(c->sys, c->frames) - 111 c->sys->audio_min_samples[0]); 112 /* # of samples */ 113 buf[2] = (0 << 7) | /* multi-stereo */ 114 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */ 115 (0 << 4) | /* pair bit: 0 -- one pair of channels */ 116 !!va_arg(ap, int); /* audio mode */ 117 buf[3] = (1 << 7) | /* res */ 118 (1 << 6) | /* multi-language flag */ 119 (c->sys->dsf << 5) | /* system: 60fields/50fields */ 120 (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */ 121 buf[4] = (1 << 7) | /* emphasis: 1 -- off */ 122 (0 << 6) | /* emphasis time constant: 0 -- reserved */ 123 (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */ 124 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */ 125 va_end(ap); 126 break; 127 case dv_audio_control: 128 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */ 129 (1 << 4) | /* input source: 1 -- digital input */ 130 (3 << 2) | /* compression: 3 -- no information */ 131 0; /* misc. info/SMPTE emphasis off */ 132 buf[2] = (1 << 7) | /* recording start point: 1 -- no */ 133 (1 << 6) | /* recording end point: 1 -- no */ 134 (1 << 3) | /* recording mode: 1 -- original */ 135 7; 136 buf[3] = (1 << 7) | /* direction: 1 -- forward */ 137 (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */ 138 c->sys->ltc_divisor * 4); 139 buf[4] = (1 << 7) | /* reserved -- always 1 */ 140 0x7f; /* genre category */ 141 break; 142 case dv_audio_recdate: 143 case dv_video_recdate: /* VAUX recording date */ 144 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, 145 c->sys->time_base.den, AV_ROUND_DOWN); 146 brktimegm(ct, &tc); 147 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */ 148 /* 0xff is very likely to be "unknown" */ 149 buf[2] = (3 << 6) | /* reserved -- always 1 */ 150 ((tc.tm_mday / 10) << 4) | /* Tens of day */ 151 (tc.tm_mday % 10); /* Units of day */ 152 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */ 153 ((tc.tm_mon / 10) << 4) | /* Tens of month */ 154 (tc.tm_mon % 10); /* Units of month */ 155 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */ 156 (tc.tm_year % 10); /* Units of year */ 157 break; 158 case dv_audio_rectime: /* AAUX recording time */ 159 case dv_video_rectime: /* VAUX recording time */ 160 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, 161 c->sys->time_base.den, AV_ROUND_DOWN); 162 brktimegm(ct, &tc); 163 buf[1] = (3 << 6) | /* reserved -- always 1 */ 164 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */ 165 buf[2] = (1 << 7) | /* reserved -- always 1 */ 166 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */ 167 (tc.tm_sec % 10); /* Units of seconds */ 168 buf[3] = (1 << 7) | /* reserved -- always 1 */ 169 ((tc.tm_min / 10) << 4) | /* Tens of minutes */ 170 (tc.tm_min % 10); /* Units of minutes */ 171 buf[4] = (3 << 6) | /* reserved -- always 1 */ 172 ((tc.tm_hour / 10) << 4) | /* Tens of hours */ 173 (tc.tm_hour % 10); /* Units of hours */ 174 break; 175 default: 176 buf[1] = buf[2] = buf[3] = buf[4] = 0xff; 177 } 178 return 5; 179} 180 181static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr) 182{ 183 int i, j, d, of, size; 184 size = 4 * dv_audio_frame_size(c->sys, c->frames); 185 frame_ptr += channel * c->sys->difseg_size * 150 * 80; 186 for (i = 0; i < c->sys->difseg_size; i++) { 187 frame_ptr += 6 * 80; /* skip DIF segment header */ 188 for (j = 0; j < 9; j++) { 189 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2); 190 for (d = 8; d < 80; d+=2) { 191 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride; 192 if (of*2 >= size) 193 continue; 194 195 frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit 196 frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM 197 } 198 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */ 199 } 200 } 201} 202 203static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame) 204{ 205 int j, k; 206 uint8_t* buf; 207 208 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) { 209 /* DV subcode: 2nd and 3d DIFs */ 210 for (j = 80; j < 80 * 3; j += 80) { 211 for (k = 6; k < 6 * 8; k += 8) 212 dv_write_pack(dv_timecode, c, &buf[j+k]); 213 214 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 ? */ 215 dv_write_pack(dv_video_recdate, c, &buf[j+14]); 216 dv_write_pack(dv_video_rectime, c, &buf[j+22]); 217 dv_write_pack(dv_video_recdate, c, &buf[j+38]); 218 dv_write_pack(dv_video_rectime, c, &buf[j+46]); 219 } 220 } 221 222 /* DV VAUX: 4th, 5th and 6th 3DIFs */ 223 for (j = 80*3 + 3; j < 80*6; j += 80) { 224 dv_write_pack(dv_video_recdate, c, &buf[j+5*2]); 225 dv_write_pack(dv_video_rectime, c, &buf[j+5*3]); 226 dv_write_pack(dv_video_recdate, c, &buf[j+5*11]); 227 dv_write_pack(dv_video_rectime, c, &buf[j+5*12]); 228 } 229 } 230} 231 232/* 233 * The following 3 functions constitute our interface to the world 234 */ 235 236static int dv_assemble_frame(DVMuxContext *c, AVStream* st, 237 uint8_t* data, int data_size, uint8_t** frame) 238{ 239 int i, reqasize; 240 241 *frame = &c->frame_buf[0]; 242 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames); 243 244 switch (st->codec->codec_type) { 245 case AVMEDIA_TYPE_VIDEO: 246 /* FIXME: we have to have more sensible approach than this one */ 247 if (c->has_video) 248 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames); 249 250 memcpy(*frame, data, c->sys->frame_size); 251 c->has_video = 1; 252 break; 253 case AVMEDIA_TYPE_AUDIO: 254 for (i = 0; i < c->n_ast && st != c->ast[i]; i++); 255 256 /* FIXME: we have to have more sensible approach than this one */ 257 if (av_fifo_size(c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) 258 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); 259 av_fifo_generic_write(c->audio_data[i], data, data_size, NULL); 260 261 /* Let us see if we've got enough audio for one DV frame. */ 262 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); 263 264 break; 265 default: 266 break; 267 } 268 269 /* Let us see if we have enough data to construct one DV frame. */ 270 if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) { 271 dv_inject_metadata(c, *frame); 272 c->has_audio = 0; 273 for (i=0; i < c->n_ast; i++) { 274 dv_inject_audio(c, i, *frame); 275 av_fifo_drain(c->audio_data[i], reqasize); 276 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); 277 } 278 279 c->has_video = 0; 280 281 c->frames++; 282 283 return c->sys->frame_size; 284 } 285 286 return 0; 287} 288 289static DVMuxContext* dv_init_mux(AVFormatContext* s) 290{ 291 DVMuxContext *c = s->priv_data; 292 AVStream *vst = NULL; 293 AVDictionaryEntry *t; 294 int i; 295 296 /* we support at most 1 video and 2 audio streams */ 297 if (s->nb_streams > 3) 298 return NULL; 299 300 c->n_ast = 0; 301 c->ast[0] = c->ast[1] = NULL; 302 303 /* We have to sort out where audio and where video stream is */ 304 for (i=0; i<s->nb_streams; i++) { 305 switch (s->streams[i]->codec->codec_type) { 306 case AVMEDIA_TYPE_VIDEO: 307 if (vst) return NULL; 308 vst = s->streams[i]; 309 break; 310 case AVMEDIA_TYPE_AUDIO: 311 if (c->n_ast > 1) return NULL; 312 c->ast[c->n_ast++] = s->streams[i]; 313 break; 314 default: 315 goto bail_out; 316 } 317 } 318 319 /* Some checks -- DV format is very picky about its incoming streams */ 320 if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO) 321 goto bail_out; 322 for (i=0; i<c->n_ast; i++) { 323 if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE || 324 c->ast[i]->codec->sample_rate != 48000 || 325 c->ast[i]->codec->channels != 2)) 326 goto bail_out; 327 } 328 c->sys = avpriv_dv_codec_profile(vst->codec); 329 if (!c->sys) 330 goto bail_out; 331 332 if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) { 333 /* only 1 stereo pair is allowed in 25Mbps mode */ 334 goto bail_out; 335 } 336 337 /* Ok, everything seems to be in working order */ 338 c->frames = 0; 339 c->has_audio = 0; 340 c->has_video = 0; 341#if FF_API_TIMESTAMP 342 if (s->timestamp) 343 c->start_time = s->timestamp; 344 else 345#endif 346 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) 347 c->start_time = ff_iso8601_to_unix_time(t->value); 348 349 for (i=0; i < c->n_ast; i++) { 350 if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc(100*AVCODEC_MAX_AUDIO_FRAME_SIZE))) { 351 while (i > 0) { 352 i--; 353 av_fifo_free(c->audio_data[i]); 354 } 355 goto bail_out; 356 } 357 } 358 359 return c; 360 361bail_out: 362 return NULL; 363} 364 365static void dv_delete_mux(DVMuxContext *c) 366{ 367 int i; 368 for (i=0; i < c->n_ast; i++) 369 av_fifo_free(c->audio_data[i]); 370} 371 372static int dv_write_header(AVFormatContext *s) 373{ 374 if (!dv_init_mux(s)) { 375 av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n" 376 "Make sure that you supply exactly two streams:\n" 377 " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n" 378 " (50Mbps allows an optional second audio stream)\n"); 379 return -1; 380 } 381 return 0; 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 avio_flush(s->pb); 394 } 395 return 0; 396} 397 398/* 399 * We might end up with some extra A/V data without matching counterpart. 400 * E.g. video data without enough audio to write the complete frame. 401 * Currently we simply drop the last frame. I don't know whether this 402 * is the best strategy of all 403 */ 404static int dv_write_trailer(struct AVFormatContext *s) 405{ 406 dv_delete_mux(s->priv_data); 407 return 0; 408} 409 410AVOutputFormat ff_dv_muxer = { 411 .name = "dv", 412 .long_name = NULL_IF_CONFIG_SMALL("DV video format"), 413 .extensions = "dv", 414 .priv_data_size = sizeof(DVMuxContext), 415 .audio_codec = CODEC_ID_PCM_S16LE, 416 .video_codec = CODEC_ID_DVVIDEO, 417 .write_header = dv_write_header, 418 .write_packet = dv_write_packet, 419 .write_trailer = dv_write_trailer, 420}; 421