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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.  
  33. #include "avformat.h"
  34. #include "internal.h"
  35. #include "libavcodec/dv_profile.h"
  36. #include "libavcodec/dvdata.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.  
  46. struct DVMuxContext {
  47.     AVClass          *av_class;
  48.     const DVprofile*  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.  
  60. static 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.  
  75. static int dv_audio_frame_size(const DVprofile* 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.  
  81. static 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.  
  170. static 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.  
  192. static 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.  
  225. static 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.  
  278. static 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 = avpriv_dv_codec_profile(vst->codec);
  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(100*MAX_AUDIO_FRAME_SIZE))) {
  335.             while (i > 0) {
  336.                 i--;
  337.                 av_fifo_free(c->audio_data[i]);
  338.             }
  339.             goto bail_out;
  340.         }
  341.     }
  342.  
  343.     return c;
  344.  
  345. bail_out:
  346.     return NULL;
  347. }
  348.  
  349. static void dv_delete_mux(DVMuxContext *c)
  350. {
  351.     int i;
  352.     for (i=0; i < c->n_ast; i++)
  353.         av_fifo_free(c->audio_data[i]);
  354. }
  355.  
  356. static 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.  
  384. static 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.  */
  403. static int dv_write_trailer(struct AVFormatContext *s)
  404. {
  405.     dv_delete_mux(s->priv_data);
  406.     return 0;
  407. }
  408.  
  409. AVOutputFormat 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.