Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  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/dv.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 AVDVProfile*  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 AVDVProfile* sys, int frame, int sample_rate)
  76. {
  77.     if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
  78.         if      (sample_rate == 32000) return 1280;
  79.         else if (sample_rate == 44100) return 1764;
  80.         else                           return 1920;
  81.     }
  82.  
  83.     av_assert0(sample_rate == 48000);
  84.  
  85.     return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
  86.                                             sizeof(sys->audio_samples_dist[0]))];
  87. }
  88.  
  89. static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
  90. {
  91.     struct tm tc;
  92.     time_t ct;
  93.     uint32_t timecode;
  94.     va_list ap;
  95.     int audio_type = 0;
  96.     int channel;
  97.  
  98.     buf[0] = (uint8_t)pack_id;
  99.     switch (pack_id) {
  100.     case dv_timecode:
  101.         timecode  = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
  102.         timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
  103.         AV_WB32(buf + 1, timecode);
  104.         break;
  105.     case dv_audio_source:  /* AAUX source pack */
  106.         va_start(ap, buf);
  107.         channel = va_arg(ap, int);
  108.         if (c->ast[channel]->codec->sample_rate == 44100) {
  109.             audio_type = 1;
  110.         } else if (c->ast[channel]->codec->sample_rate == 32000)
  111.             audio_type = 2;
  112.         buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
  113.                  (1 << 6) | /* reserved -- always 1 */
  114.                  (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codec->sample_rate) -
  115.                   c->sys->audio_min_samples[audio_type]);
  116.                             /* # of samples      */
  117.         buf[2] = (0 << 7) | /* multi-stereo      */
  118.                  (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
  119.                  (0 << 4) | /* pair bit: 0 -- one pair of channels */
  120.                  !!va_arg(ap, int); /* audio mode        */
  121.         buf[3] = (1 << 7) | /* res               */
  122.                  (1 << 6) | /* multi-language flag */
  123.                  (c->sys->dsf << 5) | /*  system: 60fields/50fields */
  124.                  (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
  125.         buf[4] = (1 << 7) | /* emphasis: 1 -- off */
  126.                  (0 << 6) | /* emphasis time constant: 0 -- reserved */
  127.                  (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
  128.                   0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
  129.  
  130.         va_end(ap);
  131.         break;
  132.     case dv_audio_control:
  133.         buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
  134.                  (1 << 4) | /* input source: 1 -- digital input */
  135.                  (3 << 2) | /* compression: 3 -- no information */
  136.                   0;        /* misc. info/SMPTE emphasis off */
  137.         buf[2] = (1 << 7) | /* recording start point: 1 -- no */
  138.                  (1 << 6) | /* recording end point: 1 -- no */
  139.                  (1 << 3) | /* recording mode: 1 -- original */
  140.                   7;
  141.         buf[3] = (1 << 7) | /* direction: 1 -- forward */
  142.                  (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
  143.                                                        c->sys->ltc_divisor * 4);
  144.         buf[4] = (1 << 7) | /* reserved -- always 1 */
  145.                   0x7f;     /* genre category */
  146.         break;
  147.     case dv_audio_recdate:
  148.     case dv_video_recdate:  /* VAUX recording date */
  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] = 0xff; /* ds, tm, tens of time zone, units of time zone */
  153.                        /* 0xff is very likely to be "unknown" */
  154.         buf[2] = (3 << 6) | /* reserved -- always 1 */
  155.                  ((tc.tm_mday / 10) << 4) | /* Tens of day */
  156.                  (tc.tm_mday % 10);         /* Units of day */
  157.         buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
  158.                  ((tc.tm_mon / 10) << 4) |    /* Tens of month */
  159.                  (tc.tm_mon  % 10);           /* Units of month */
  160.         buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
  161.                  (tc.tm_year % 10);                 /* Units of year */
  162.         break;
  163.     case dv_audio_rectime:  /* AAUX recording time */
  164.     case dv_video_rectime:  /* VAUX recording time */
  165.         ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
  166.                                                        c->sys->time_base.den, AV_ROUND_DOWN);
  167.         ff_brktimegm(ct, &tc);
  168.         buf[1] = (3 << 6) | /* reserved -- always 1 */
  169.                  0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
  170.         buf[2] = (1 << 7) | /* reserved -- always 1 */
  171.                  ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
  172.                  (tc.tm_sec % 10);         /* Units of seconds */
  173.         buf[3] = (1 << 7) | /* reserved -- always 1 */
  174.                  ((tc.tm_min / 10) << 4) | /* Tens of minutes */
  175.                  (tc.tm_min % 10);         /* Units of minutes */
  176.         buf[4] = (3 << 6) | /* reserved -- always 1 */
  177.                  ((tc.tm_hour / 10) << 4) | /* Tens of hours */
  178.                  (tc.tm_hour % 10);         /* Units of hours */
  179.         break;
  180.     default:
  181.         buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
  182.     }
  183.     return 5;
  184. }
  185.  
  186. static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
  187. {
  188.     int i, j, d, of, size;
  189.     size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codec->sample_rate);
  190.     frame_ptr += channel * c->sys->difseg_size * 150 * 80;
  191.     for (i = 0; i < c->sys->difseg_size; i++) {
  192.         frame_ptr += 6 * 80; /* skip DIF segment header */
  193.         for (j = 0; j < 9; j++) {
  194.             dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i >= c->sys->difseg_size/2);
  195.             for (d = 8; d < 80; d+=2) {
  196.                 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
  197.                 if (of*2 >= size)
  198.                     continue;
  199.  
  200.                 frame_ptr[d]   = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
  201.                 frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2);   //        that DV is a big-endian PCM
  202.             }
  203.             frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
  204.         }
  205.     }
  206. }
  207.  
  208. static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
  209. {
  210.     int j, k;
  211.     uint8_t* buf;
  212.  
  213.     for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
  214.         /* DV subcode: 2nd and 3d DIFs */
  215.         for (j = 80; j < 80 * 3; j += 80) {
  216.             for (k = 6; k < 6 * 8; k += 8)
  217.                 dv_write_pack(dv_timecode, c, &buf[j+k]);
  218.  
  219.             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 ? */
  220.                 dv_write_pack(dv_video_recdate, c, &buf[j+14]);
  221.                 dv_write_pack(dv_video_rectime, c, &buf[j+22]);
  222.                 dv_write_pack(dv_video_recdate, c, &buf[j+38]);
  223.                 dv_write_pack(dv_video_rectime, c, &buf[j+46]);
  224.             }
  225.         }
  226.  
  227.         /* DV VAUX: 4th, 5th and 6th 3DIFs */
  228.         for (j = 80*3 + 3; j < 80*6; j += 80) {
  229.             dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
  230.             dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
  231.             dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
  232.             dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
  233.         }
  234.     }
  235. }
  236.  
  237. /*
  238.  * The following 3 functions constitute our interface to the world
  239.  */
  240.  
  241. static int dv_assemble_frame(DVMuxContext *c, AVStream* st,
  242.                              uint8_t* data, int data_size, uint8_t** frame)
  243. {
  244.     int i, reqasize;
  245.  
  246.     *frame = &c->frame_buf[0];
  247.  
  248.     switch (st->codec->codec_type) {
  249.     case AVMEDIA_TYPE_VIDEO:
  250.         /* FIXME: we have to have more sensible approach than this one */
  251.         if (c->has_video)
  252.             av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
  253.  
  254.         memcpy(*frame, data, c->sys->frame_size);
  255.         c->has_video = 1;
  256.         break;
  257.     case AVMEDIA_TYPE_AUDIO:
  258.         for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
  259.  
  260.           /* FIXME: we have to have more sensible approach than this one */
  261.         if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE)
  262.             av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
  263.         av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);
  264.  
  265.         reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codec->sample_rate);
  266.  
  267.         /* Let us see if we've got enough audio for one DV frame. */
  268.         c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
  269.  
  270.         break;
  271.     default:
  272.         break;
  273.     }
  274.  
  275.     /* Let us see if we have enough data to construct one DV frame. */
  276.     if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
  277.         dv_inject_metadata(c, *frame);
  278.         c->has_audio = 0;
  279.         for (i=0; i < c->n_ast; i++) {
  280.             dv_inject_audio(c, i, *frame);
  281.             reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codec->sample_rate);
  282.             av_fifo_drain(c->audio_data[i], reqasize);
  283.             c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
  284.         }
  285.  
  286.         c->has_video = 0;
  287.  
  288.         c->frames++;
  289.  
  290.         return c->sys->frame_size;
  291.     }
  292.  
  293.     return 0;
  294. }
  295.  
  296. static DVMuxContext* dv_init_mux(AVFormatContext* s)
  297. {
  298.     DVMuxContext *c = s->priv_data;
  299.     AVStream *vst = NULL;
  300.     AVDictionaryEntry *t;
  301.     int i;
  302.  
  303.     /* we support at most 1 video and 2 audio streams */
  304.     if (s->nb_streams > 3)
  305.         return NULL;
  306.  
  307.     c->n_ast  = 0;
  308.     c->ast[0] = c->ast[1] = NULL;
  309.  
  310.     /* We have to sort out where audio and where video stream is */
  311.     for (i=0; i<s->nb_streams; i++) {
  312.         switch (s->streams[i]->codec->codec_type) {
  313.         case AVMEDIA_TYPE_VIDEO:
  314.             if (vst) return NULL;
  315.             vst = s->streams[i];
  316.             break;
  317.         case AVMEDIA_TYPE_AUDIO:
  318.             if (c->n_ast > 1) return NULL;
  319.             c->ast[c->n_ast++] = s->streams[i];
  320.             break;
  321.         default:
  322.             goto bail_out;
  323.         }
  324.     }
  325.  
  326.     /* Some checks -- DV format is very picky about its incoming streams */
  327.     if (!vst || vst->codec->codec_id != AV_CODEC_ID_DVVIDEO)
  328.         goto bail_out;
  329.     for (i=0; i<c->n_ast; i++) {
  330.         if (c->ast[i]) {
  331.             if(c->ast[i]->codec->codec_id    != AV_CODEC_ID_PCM_S16LE ||
  332.                c->ast[i]->codec->channels    != 2)
  333.                 goto bail_out;
  334.             if (c->ast[i]->codec->sample_rate != 48000 &&
  335.                 c->ast[i]->codec->sample_rate != 44100 &&
  336.                 c->ast[i]->codec->sample_rate != 32000    )
  337.                 goto bail_out;
  338.         }
  339.     }
  340.     c->sys = av_dv_codec_profile2(vst->codec->width, vst->codec->height,
  341.                                   vst->codec->pix_fmt, vst->codec->time_base);
  342.     if (!c->sys)
  343.         goto bail_out;
  344.  
  345.     if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
  346.         if (c->ast[0] && c->ast[0]->codec->sample_rate != 48000)
  347.             goto bail_out;
  348.         if (c->ast[1] && c->ast[1]->codec->sample_rate != 48000)
  349.             goto bail_out;
  350.     }
  351.  
  352.     if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
  353.         /* only 1 stereo pair is allowed in 25Mbps mode */
  354.         goto bail_out;
  355.     }
  356.  
  357.     /* Ok, everything seems to be in working order */
  358.     c->frames     = 0;
  359.     c->has_audio  = 0;
  360.     c->has_video  = 0;
  361.     if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
  362.         c->start_time = ff_iso8601_to_unix_time(t->value);
  363.  
  364.     for (i=0; i < c->n_ast; i++) {
  365.         if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) {
  366.             while (i > 0) {
  367.                 i--;
  368.                 av_fifo_freep(&c->audio_data[i]);
  369.             }
  370.             goto bail_out;
  371.         }
  372.     }
  373.  
  374.     return c;
  375.  
  376. bail_out:
  377.     return NULL;
  378. }
  379.  
  380. static void dv_delete_mux(DVMuxContext *c)
  381. {
  382.     int i;
  383.     for (i=0; i < c->n_ast; i++)
  384.         av_fifo_freep(&c->audio_data[i]);
  385. }
  386.  
  387. static int dv_write_header(AVFormatContext *s)
  388. {
  389.     AVRational rate;
  390.     DVMuxContext *dvc = s->priv_data;
  391.     AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
  392.  
  393.     if (!dv_init_mux(s)) {
  394.         av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
  395.                     "Make sure that you supply exactly two streams:\n"
  396.                     "     video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
  397.                     "     (50Mbps allows an optional second audio stream)\n");
  398.         return -1;
  399.     }
  400.     rate.num = dvc->sys->ltc_divisor;
  401.     rate.den = 1;
  402.     if (!tcr) { // no global timecode, look into the streams
  403.         int i;
  404.         for (i = 0; i < s->nb_streams; i++) {
  405.             tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
  406.             if (tcr)
  407.                 break;
  408.         }
  409.     }
  410.     if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
  411.         return 0;
  412.     return av_timecode_init(&dvc->tc, rate, 0, 0, s);
  413. }
  414.  
  415. static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  416. {
  417.     uint8_t* frame;
  418.     int fsize;
  419.  
  420.     fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index],
  421.                               pkt->data, pkt->size, &frame);
  422.     if (fsize > 0) {
  423.         avio_write(s->pb, frame, fsize);
  424.     }
  425.     return 0;
  426. }
  427.  
  428. /*
  429.  * We might end up with some extra A/V data without matching counterpart.
  430.  * E.g. video data without enough audio to write the complete frame.
  431.  * Currently we simply drop the last frame. I don't know whether this
  432.  * is the best strategy of all
  433.  */
  434. static int dv_write_trailer(struct AVFormatContext *s)
  435. {
  436.     dv_delete_mux(s->priv_data);
  437.     return 0;
  438. }
  439.  
  440. AVOutputFormat ff_dv_muxer = {
  441.     .name              = "dv",
  442.     .long_name         = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
  443.     .extensions        = "dv",
  444.     .priv_data_size    = sizeof(DVMuxContext),
  445.     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
  446.     .video_codec       = AV_CODEC_ID_DVVIDEO,
  447.     .write_header      = dv_write_header,
  448.     .write_packet      = dv_write_packet,
  449.     .write_trailer     = dv_write_trailer,
  450. };
  451.