dvenc.c 16 KB

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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. *
  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 "internal.h"
  34. #include "libavcodec/dvdata.h"
  35. #include "dv.h"
  36. #include "libavutil/fifo.h"
  37. struct 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. static const int dv_aaux_packs_dist[12][9] = {
  49. { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
  50. { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
  51. { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
  52. { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
  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. };
  62. static int dv_audio_frame_size(const DVprofile* sys, int frame)
  63. {
  64. return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
  65. sizeof(sys->audio_samples_dist[0]))];
  66. }
  67. static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
  68. {
  69. struct tm tc;
  70. time_t ct;
  71. int ltc_frame;
  72. va_list ap;
  73. buf[0] = (uint8_t)pack_id;
  74. switch (pack_id) {
  75. case dv_timecode:
  76. ct = (time_t)av_rescale_rnd(c->frames, c->sys->time_base.num,
  77. c->sys->time_base.den, AV_ROUND_DOWN);
  78. brktimegm(ct, &tc);
  79. /*
  80. * LTC drop-frame frame counter drops two frames (0 and 1) every
  81. * minute, unless it is exactly divisible by 10
  82. */
  83. ltc_frame = (c->frames + 2 * ct / 60 - 2 * ct / 600) % c->sys->ltc_divisor;
  84. buf[1] = (0 << 7) | /* color frame: 0 - unsync; 1 - sync mode */
  85. (1 << 6) | /* drop frame timecode: 0 - nondrop; 1 - drop */
  86. ((ltc_frame / 10) << 4) | /* tens of frames */
  87. (ltc_frame % 10); /* units of frames */
  88. buf[2] = (1 << 7) | /* biphase mark polarity correction: 0 - even; 1 - odd */
  89. ((tc.tm_sec / 10) << 4) | /* tens of seconds */
  90. (tc.tm_sec % 10); /* units of seconds */
  91. buf[3] = (1 << 7) | /* binary group flag BGF0 */
  92. ((tc.tm_min / 10) << 4) | /* tens of minutes */
  93. (tc.tm_min % 10); /* units of minutes */
  94. buf[4] = (1 << 7) | /* binary group flag BGF2 */
  95. (1 << 6) | /* binary group flag BGF1 */
  96. ((tc.tm_hour / 10) << 4) | /* tens of hours */
  97. (tc.tm_hour % 10); /* units of hours */
  98. break;
  99. case dv_audio_source: /* AAUX source pack */
  100. va_start(ap, buf);
  101. buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
  102. (1 << 6) | /* reserved -- always 1 */
  103. (dv_audio_frame_size(c->sys, c->frames) -
  104. c->sys->audio_min_samples[0]);
  105. /* # of samples */
  106. buf[2] = (0 << 7) | /* multi-stereo */
  107. (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
  108. (0 << 4) | /* pair bit: 0 -- one pair of channels */
  109. !!va_arg(ap, int); /* audio mode */
  110. buf[3] = (1 << 7) | /* res */
  111. (1 << 6) | /* multi-language flag */
  112. (c->sys->dsf << 5) | /* system: 60fields/50fields */
  113. (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
  114. buf[4] = (1 << 7) | /* emphasis: 1 -- off */
  115. (0 << 6) | /* emphasis time constant: 0 -- reserved */
  116. (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
  117. 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
  118. va_end(ap);
  119. break;
  120. case dv_audio_control:
  121. buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
  122. (1 << 4) | /* input source: 1 -- digital input */
  123. (3 << 2) | /* compression: 3 -- no information */
  124. 0; /* misc. info/SMPTE emphasis off */
  125. buf[2] = (1 << 7) | /* recording start point: 1 -- no */
  126. (1 << 6) | /* recording end point: 1 -- no */
  127. (1 << 3) | /* recording mode: 1 -- original */
  128. 7;
  129. buf[3] = (1 << 7) | /* direction: 1 -- forward */
  130. (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */
  131. c->sys->ltc_divisor * 4);
  132. buf[4] = (1 << 7) | /* reserved -- always 1 */
  133. 0x7f; /* genre category */
  134. break;
  135. case dv_audio_recdate:
  136. case dv_video_recdate: /* VAUX recording date */
  137. ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
  138. c->sys->time_base.den, AV_ROUND_DOWN);
  139. brktimegm(ct, &tc);
  140. buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
  141. /* 0xff is very likely to be "unknown" */
  142. buf[2] = (3 << 6) | /* reserved -- always 1 */
  143. ((tc.tm_mday / 10) << 4) | /* Tens of day */
  144. (tc.tm_mday % 10); /* Units of day */
  145. buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
  146. ((tc.tm_mon / 10) << 4) | /* Tens of month */
  147. (tc.tm_mon % 10); /* Units of month */
  148. buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
  149. (tc.tm_year % 10); /* Units of year */
  150. break;
  151. case dv_audio_rectime: /* AAUX recording time */
  152. case dv_video_rectime: /* VAUX recording time */
  153. ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
  154. c->sys->time_base.den, AV_ROUND_DOWN);
  155. brktimegm(ct, &tc);
  156. buf[1] = (3 << 6) | /* reserved -- always 1 */
  157. 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
  158. buf[2] = (1 << 7) | /* reserved -- always 1 */
  159. ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
  160. (tc.tm_sec % 10); /* Units of seconds */
  161. buf[3] = (1 << 7) | /* reserved -- always 1 */
  162. ((tc.tm_min / 10) << 4) | /* Tens of minutes */
  163. (tc.tm_min % 10); /* Units of minutes */
  164. buf[4] = (3 << 6) | /* reserved -- always 1 */
  165. ((tc.tm_hour / 10) << 4) | /* Tens of hours */
  166. (tc.tm_hour % 10); /* Units of hours */
  167. break;
  168. default:
  169. buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
  170. }
  171. return 5;
  172. }
  173. static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
  174. {
  175. int i, j, d, of, size;
  176. size = 4 * dv_audio_frame_size(c->sys, c->frames);
  177. frame_ptr += channel * c->sys->difseg_size * 150 * 80;
  178. for (i = 0; i < c->sys->difseg_size; i++) {
  179. frame_ptr += 6 * 80; /* skip DIF segment header */
  180. for (j = 0; j < 9; j++) {
  181. dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2);
  182. for (d = 8; d < 80; d+=2) {
  183. of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
  184. if (of*2 >= size)
  185. continue;
  186. frame_ptr[d] = av_fifo_peek(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
  187. frame_ptr[d+1] = av_fifo_peek(c->audio_data[channel], of*2); // that DV is a big-endian PCM
  188. }
  189. frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
  190. }
  191. }
  192. }
  193. static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
  194. {
  195. int j, k;
  196. uint8_t* buf;
  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. 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 ? */
  203. dv_write_pack(dv_video_recdate, c, &buf[j+14]);
  204. dv_write_pack(dv_video_rectime, c, &buf[j+22]);
  205. dv_write_pack(dv_video_recdate, c, &buf[j+38]);
  206. dv_write_pack(dv_video_rectime, c, &buf[j+46]);
  207. }
  208. }
  209. /* DV VAUX: 4th, 5th and 6th 3DIFs */
  210. for (j = 80*3 + 3; j < 80*6; j += 80) {
  211. dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
  212. dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
  213. dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
  214. dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
  215. }
  216. }
  217. }
  218. /*
  219. * The following 3 functions constitute our interface to the world
  220. */
  221. static int dv_assemble_frame(DVMuxContext *c, AVStream* st,
  222. uint8_t* data, int data_size, uint8_t** frame)
  223. {
  224. int i, reqasize;
  225. *frame = &c->frame_buf[0];
  226. reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
  227. switch (st->codec->codec_type) {
  228. case AVMEDIA_TYPE_VIDEO:
  229. /* FIXME: we have to have more sensible approach than this one */
  230. if (c->has_video)
  231. av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
  232. memcpy(*frame, data, c->sys->frame_size);
  233. c->has_video = 1;
  234. break;
  235. case AVMEDIA_TYPE_AUDIO:
  236. for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
  237. /* FIXME: we have to have more sensible approach than this one */
  238. if (av_fifo_size(c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
  239. av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
  240. av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);
  241. /* Let us see if we've got enough audio for one DV frame. */
  242. c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
  243. break;
  244. default:
  245. break;
  246. }
  247. /* Let us see if we have enough data to construct one DV frame. */
  248. if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
  249. dv_inject_metadata(c, *frame);
  250. c->has_audio = 0;
  251. for (i=0; i < c->n_ast; i++) {
  252. dv_inject_audio(c, i, *frame);
  253. av_fifo_drain(c->audio_data[i], reqasize);
  254. c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
  255. }
  256. c->has_video = 0;
  257. c->frames++;
  258. return c->sys->frame_size;
  259. }
  260. return 0;
  261. }
  262. static DVMuxContext* dv_init_mux(AVFormatContext* s)
  263. {
  264. DVMuxContext *c = s->priv_data;
  265. AVStream *vst = NULL;
  266. int i;
  267. /* we support at most 1 video and 2 audio streams */
  268. if (s->nb_streams > 3)
  269. return NULL;
  270. c->n_ast = 0;
  271. c->ast[0] = c->ast[1] = NULL;
  272. /* We have to sort out where audio and where video stream is */
  273. for (i=0; i<s->nb_streams; i++) {
  274. switch (s->streams[i]->codec->codec_type) {
  275. case AVMEDIA_TYPE_VIDEO:
  276. if (vst) return NULL;
  277. vst = s->streams[i];
  278. break;
  279. case AVMEDIA_TYPE_AUDIO:
  280. if (c->n_ast > 1) return NULL;
  281. c->ast[c->n_ast++] = s->streams[i];
  282. break;
  283. default:
  284. goto bail_out;
  285. }
  286. }
  287. /* Some checks -- DV format is very picky about its incoming streams */
  288. if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO)
  289. goto bail_out;
  290. for (i=0; i<c->n_ast; i++) {
  291. if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE ||
  292. c->ast[i]->codec->sample_rate != 48000 ||
  293. c->ast[i]->codec->channels != 2))
  294. goto bail_out;
  295. }
  296. c->sys = ff_dv_codec_profile(vst->codec);
  297. if (!c->sys)
  298. goto bail_out;
  299. if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
  300. /* only 1 stereo pair is allowed in 25Mbps mode */
  301. goto bail_out;
  302. }
  303. /* Ok, everything seems to be in working order */
  304. c->frames = 0;
  305. c->has_audio = 0;
  306. c->has_video = 0;
  307. c->start_time = (time_t)s->timestamp;
  308. for (i=0; i < c->n_ast; i++) {
  309. if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc(100*AVCODEC_MAX_AUDIO_FRAME_SIZE))) {
  310. while (i > 0) {
  311. i--;
  312. av_fifo_free(c->audio_data[i]);
  313. }
  314. goto bail_out;
  315. }
  316. }
  317. return c;
  318. bail_out:
  319. return NULL;
  320. }
  321. static void dv_delete_mux(DVMuxContext *c)
  322. {
  323. int i;
  324. for (i=0; i < c->n_ast; i++)
  325. av_fifo_free(c->audio_data[i]);
  326. }
  327. static int dv_write_header(AVFormatContext *s)
  328. {
  329. if (!dv_init_mux(s)) {
  330. av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
  331. "Make sure that you supply exactly two streams:\n"
  332. " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n"
  333. " (50Mbps allows an optional second audio stream)\n");
  334. return -1;
  335. }
  336. return 0;
  337. }
  338. static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  339. {
  340. uint8_t* frame;
  341. int fsize;
  342. fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index],
  343. pkt->data, pkt->size, &frame);
  344. if (fsize > 0) {
  345. avio_write(s->pb, frame, fsize);
  346. avio_flush(s->pb);
  347. }
  348. return 0;
  349. }
  350. /*
  351. * We might end up with some extra A/V data without matching counterpart.
  352. * E.g. video data without enough audio to write the complete frame.
  353. * Currently we simply drop the last frame. I don't know whether this
  354. * is the best strategy of all
  355. */
  356. static int dv_write_trailer(struct AVFormatContext *s)
  357. {
  358. dv_delete_mux(s->priv_data);
  359. return 0;
  360. }
  361. AVOutputFormat ff_dv_muxer = {
  362. "dv",
  363. NULL_IF_CONFIG_SMALL("DV video format"),
  364. NULL,
  365. "dv",
  366. sizeof(DVMuxContext),
  367. CODEC_ID_PCM_S16LE,
  368. CODEC_ID_DVVIDEO,
  369. dv_write_header,
  370. dv_write_packet,
  371. dv_write_trailer,
  372. };