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/dvdata.h" 36#include "dv.h" 37#include "libavutil/fifo.h" 38 39struct DVMuxContext { 40 const DVprofile* sys; /* current DV profile, e.g.: 525/60, 625/50 */ 41 int n_ast; /* number of stereo audio streams (up to 2) */ 42 AVStream *ast[2]; /* stereo audio streams */ 43 AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */ 44 int frames; /* current frame number */ 45 time_t start_time; /* recording start time */ 46 int has_audio; /* frame under contruction has audio */ 47 int has_video; /* frame under contruction has video */ 48 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */ 49}; 50 51static const int dv_aaux_packs_dist[12][9] = { 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 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, 63 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, 64}; 65 66static int dv_audio_frame_size(const DVprofile* sys, int frame) 67{ 68 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) / 69 sizeof(sys->audio_samples_dist[0]))]; 70} 71 72static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...) 73{ 74 struct tm tc; 75 time_t ct; 76 int ltc_frame; 77 va_list ap; 78 79 buf[0] = (uint8_t)pack_id; 80 switch (pack_id) { 81 case dv_timecode: 82 ct = (time_t)av_rescale_rnd(c->frames, c->sys->time_base.num, 83 c->sys->time_base.den, AV_ROUND_DOWN); 84 brktimegm(ct, &tc); 85 /* 86 * LTC drop-frame frame counter drops two frames (0 and 1) every 87 * minute, unless it is exactly divisible by 10 88 */ 89 ltc_frame = (c->frames + 2 * ct / 60 - 2 * ct / 600) % c->sys->ltc_divisor; 90 buf[1] = (0 << 7) | /* color frame: 0 - unsync; 1 - sync mode */ 91 (1 << 6) | /* drop frame timecode: 0 - nondrop; 1 - drop */ 92 ((ltc_frame / 10) << 4) | /* tens of frames */ 93 (ltc_frame % 10); /* units of frames */ 94 buf[2] = (1 << 7) | /* biphase mark polarity correction: 0 - even; 1 - odd */ 95 ((tc.tm_sec / 10) << 4) | /* tens of seconds */ 96 (tc.tm_sec % 10); /* units of seconds */ 97 buf[3] = (1 << 7) | /* binary group flag BGF0 */ 98 ((tc.tm_min / 10) << 4) | /* tens of minutes */ 99 (tc.tm_min % 10); /* units of minutes */ 100 buf[4] = (1 << 7) | /* binary group flag BGF2 */ 101 (1 << 6) | /* binary group flag BGF1 */ 102 ((tc.tm_hour / 10) << 4) | /* tens of hours */ 103 (tc.tm_hour % 10); /* units of hours */ 104 break; 105 case dv_audio_source: /* AAUX source pack */ 106 va_start(ap, buf); 107 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */ 108 (1 << 6) | /* reserved -- always 1 */ 109 (dv_audio_frame_size(c->sys, c->frames) - 110 c->sys->audio_min_samples[0]); 111 /* # of samples */ 112 buf[2] = (0 << 7) | /* multi-stereo */ 113 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */ 114 (0 << 4) | /* pair bit: 0 -- one pair of channels */ 115 !!va_arg(ap, int); /* audio mode */ 116 buf[3] = (1 << 7) | /* res */ 117 (1 << 6) | /* multi-language flag */ 118 (c->sys->dsf << 5) | /* system: 60fields/50fields */ 119 (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */ 120 buf[4] = (1 << 7) | /* emphasis: 1 -- off */ 121 (0 << 6) | /* emphasis time constant: 0 -- reserved */ 122 (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */ 123 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */ 124 va_end(ap); 125 break; 126 case dv_audio_control: 127 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */ 128 (1 << 4) | /* input source: 1 -- digital input */ 129 (3 << 2) | /* compression: 3 -- no information */ 130 0; /* misc. info/SMPTE emphasis off */ 131 buf[2] = (1 << 7) | /* recording start point: 1 -- no */ 132 (1 << 6) | /* recording end point: 1 -- no */ 133 (1 << 3) | /* recording mode: 1 -- original */ 134 7; 135 buf[3] = (1 << 7) | /* direction: 1 -- forward */ 136 (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */ 137 c->sys->ltc_divisor * 4); 138 buf[4] = (1 << 7) | /* reserved -- always 1 */ 139 0x7f; /* genre category */ 140 break; 141 case dv_audio_recdate: 142 case dv_video_recdate: /* VAUX recording date */ 143 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, 144 c->sys->time_base.den, AV_ROUND_DOWN); 145 brktimegm(ct, &tc); 146 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */ 147 /* 0xff is very likely to be "unknown" */ 148 buf[2] = (3 << 6) | /* reserved -- always 1 */ 149 ((tc.tm_mday / 10) << 4) | /* Tens of day */ 150 (tc.tm_mday % 10); /* Units of day */ 151 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */ 152 ((tc.tm_mon / 10) << 4) | /* Tens of month */ 153 (tc.tm_mon % 10); /* Units of month */ 154 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */ 155 (tc.tm_year % 10); /* Units of year */ 156 break; 157 case dv_audio_rectime: /* AAUX recording time */ 158 case dv_video_rectime: /* VAUX recording time */ 159 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, 160 c->sys->time_base.den, AV_ROUND_DOWN); 161 brktimegm(ct, &tc); 162 buf[1] = (3 << 6) | /* reserved -- always 1 */ 163 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */ 164 buf[2] = (1 << 7) | /* reserved -- always 1 */ 165 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */ 166 (tc.tm_sec % 10); /* Units of seconds */ 167 buf[3] = (1 << 7) | /* reserved -- always 1 */ 168 ((tc.tm_min / 10) << 4) | /* Tens of minutes */ 169 (tc.tm_min % 10); /* Units of minutes */ 170 buf[4] = (3 << 6) | /* reserved -- always 1 */ 171 ((tc.tm_hour / 10) << 4) | /* Tens of hours */ 172 (tc.tm_hour % 10); /* Units of hours */ 173 break; 174 default: 175 buf[1] = buf[2] = buf[3] = buf[4] = 0xff; 176 } 177 return 5; 178} 179 180static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr) 181{ 182 int i, j, d, of, size; 183 size = 4 * dv_audio_frame_size(c->sys, c->frames); 184 frame_ptr += channel * c->sys->difseg_size * 150 * 80; 185 for (i = 0; i < c->sys->difseg_size; i++) { 186 frame_ptr += 6 * 80; /* skip DIF segment header */ 187 for (j = 0; j < 9; j++) { 188 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2); 189 for (d = 8; d < 80; d+=2) { 190 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride; 191 if (of*2 >= size) 192 continue; 193 194 frame_ptr[d] = av_fifo_peek(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit 195 frame_ptr[d+1] = av_fifo_peek(c->audio_data[channel], of*2); // that DV is a big-endian PCM 196 } 197 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */ 198 } 199 } 200} 201 202static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame) 203{ 204 int j, k; 205 uint8_t* buf; 206 207 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) { 208 /* DV subcode: 2nd and 3d DIFs */ 209 for (j = 80; j < 80 * 3; j += 80) { 210 for (k = 6; k < 6 * 8; k += 8) 211 dv_write_pack(dv_timecode, c, &buf[j+k]); 212 213 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 ? */ 214 dv_write_pack(dv_video_recdate, c, &buf[j+14]); 215 dv_write_pack(dv_video_rectime, c, &buf[j+22]); 216 dv_write_pack(dv_video_recdate, c, &buf[j+38]); 217 dv_write_pack(dv_video_rectime, c, &buf[j+46]); 218 } 219 } 220 221 /* DV VAUX: 4th, 5th and 6th 3DIFs */ 222 for (j = 80*3 + 3; j < 80*6; j += 80) { 223 dv_write_pack(dv_video_recdate, c, &buf[j+5*2]); 224 dv_write_pack(dv_video_rectime, c, &buf[j+5*3]); 225 dv_write_pack(dv_video_recdate, c, &buf[j+5*11]); 226 dv_write_pack(dv_video_rectime, c, &buf[j+5*12]); 227 } 228 } 229} 230 231/* 232 * The following 3 functions constitute our interface to the world 233 */ 234 235int dv_assemble_frame(DVMuxContext *c, AVStream* st, 236 uint8_t* data, int data_size, uint8_t** frame) 237{ 238 int i, reqasize; 239 240 *frame = &c->frame_buf[0]; 241 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames); 242 243 switch (st->codec->codec_type) { 244 case AVMEDIA_TYPE_VIDEO: 245 /* FIXME: we have to have more sensible approach than this one */ 246 if (c->has_video) 247 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames); 248 249 memcpy(*frame, data, c->sys->frame_size); 250 c->has_video = 1; 251 break; 252 case AVMEDIA_TYPE_AUDIO: 253 for (i = 0; i < c->n_ast && st != c->ast[i]; i++); 254 255 /* FIXME: we have to have more sensible approach than this one */ 256 if (av_fifo_size(c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) 257 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); 258 av_fifo_generic_write(c->audio_data[i], data, data_size, NULL); 259 260 /* Let us see if we've got enough audio for one DV frame. */ 261 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); 262 263 break; 264 default: 265 break; 266 } 267 268 /* Let us see if we have enough data to construct one DV frame. */ 269 if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) { 270 dv_inject_metadata(c, *frame); 271 c->has_audio = 0; 272 for (i=0; i < c->n_ast; i++) { 273 dv_inject_audio(c, i, *frame); 274 av_fifo_drain(c->audio_data[i], reqasize); 275 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); 276 } 277 278 c->has_video = 0; 279 280 c->frames++; 281 282 return c->sys->frame_size; 283 } 284 285 return 0; 286} 287 288DVMuxContext* dv_init_mux(AVFormatContext* s) 289{ 290 DVMuxContext *c = s->priv_data; 291 AVStream *vst = NULL; 292 int i; 293 294 /* we support at most 1 video and 2 audio streams */ 295 if (s->nb_streams > 3) 296 return NULL; 297 298 c->n_ast = 0; 299 c->ast[0] = c->ast[1] = NULL; 300 301 /* We have to sort out where audio and where video stream is */ 302 for (i=0; i<s->nb_streams; i++) { 303 switch (s->streams[i]->codec->codec_type) { 304 case AVMEDIA_TYPE_VIDEO: 305 if (vst) return NULL; 306 vst = s->streams[i]; 307 break; 308 case AVMEDIA_TYPE_AUDIO: 309 if (c->n_ast > 1) return NULL; 310 c->ast[c->n_ast++] = s->streams[i]; 311 break; 312 default: 313 goto bail_out; 314 } 315 } 316 317 /* Some checks -- DV format is very picky about its incoming streams */ 318 if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO) 319 goto bail_out; 320 for (i=0; i<c->n_ast; i++) { 321 if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE || 322 c->ast[i]->codec->sample_rate != 48000 || 323 c->ast[i]->codec->channels != 2)) 324 goto bail_out; 325 } 326 c->sys = ff_dv_codec_profile(vst->codec); 327 if (!c->sys) 328 goto bail_out; 329 330 if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) { 331 /* only 1 stereo pair is allowed in 25Mbps mode */ 332 goto bail_out; 333 } 334 335 /* Ok, everything seems to be in working order */ 336 c->frames = 0; 337 c->has_audio = 0; 338 c->has_video = 0; 339 c->start_time = (time_t)s->timestamp; 340 341 for (i=0; i < c->n_ast; i++) { 342 if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc(100*AVCODEC_MAX_AUDIO_FRAME_SIZE))) { 343 while (i > 0) { 344 i--; 345 av_fifo_free(c->audio_data[i]); 346 } 347 goto bail_out; 348 } 349 } 350 351 return c; 352 353bail_out: 354 return NULL; 355} 356 357void dv_delete_mux(DVMuxContext *c) 358{ 359 int i; 360 for (i=0; i < c->n_ast; i++) 361 av_fifo_free(c->audio_data[i]); 362} 363 364#if CONFIG_DV_MUXER 365static int dv_write_header(AVFormatContext *s) 366{ 367 if (!dv_init_mux(s)) { 368 av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n" 369 "Make sure that you supply exactly two streams:\n" 370 " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n" 371 " (50Mbps allows an optional second audio stream)\n"); 372 return -1; 373 } 374 return 0; 375} 376 377static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt) 378{ 379 uint8_t* frame; 380 int fsize; 381 382 fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index], 383 pkt->data, pkt->size, &frame); 384 if (fsize > 0) { 385 put_buffer(s->pb, frame, fsize); 386 put_flush_packet(s->pb); 387 } 388 return 0; 389} 390 391/* 392 * We might end up with some extra A/V data without matching counterpart. 393 * E.g. video data without enough audio to write the complete frame. 394 * Currently we simply drop the last frame. I don't know whether this 395 * is the best strategy of all 396 */ 397static int dv_write_trailer(struct AVFormatContext *s) 398{ 399 dv_delete_mux(s->priv_data); 400 return 0; 401} 402 403AVOutputFormat dv_muxer = { 404 "dv", 405 NULL_IF_CONFIG_SMALL("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 /* CONFIG_DV_MUXER */ 416