LCOV - code coverage report
Current view: top level - libavformat - dvenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 196 224 87.5 %
Date: 2017-12-14 01:15:32 Functions: 10 10 100.0 %

          Line data    Source code
       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/avassert.h"
      39             : #include "libavutil/fifo.h"
      40             : #include "libavutil/mathematics.h"
      41             : #include "libavutil/intreadwrite.h"
      42             : #include "libavutil/opt.h"
      43             : #include "libavutil/timecode.h"
      44             : 
      45             : #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio
      46             : 
      47             : struct DVMuxContext {
      48             :     AVClass          *av_class;
      49             :     const AVDVProfile*  sys;           /* current DV profile, e.g.: 525/60, 625/50 */
      50             :     int               n_ast;         /* number of stereo audio streams (up to 2) */
      51             :     AVStream         *ast[2];        /* stereo audio streams */
      52             :     AVFifoBuffer     *audio_data[2]; /* FIFO for storing excessive amounts of PCM */
      53             :     int               frames;        /* current frame number */
      54             :     int64_t           start_time;    /* recording start time */
      55             :     int               has_audio;     /* frame under construction has audio */
      56             :     int               has_video;     /* frame under construction has video */
      57             :     uint8_t           frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
      58             :     AVTimecode        tc;            /* timecode context */
      59             : };
      60             : 
      61             : static const int dv_aaux_packs_dist[12][9] = {
      62             :     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
      63             :     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
      64             :     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
      65             :     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
      66             :     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
      67             :     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
      68             :     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
      69             :     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
      70             :     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
      71             :     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
      72             :     { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
      73             :     { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
      74             : };
      75             : 
      76        1183 : static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
      77             : {
      78        1183 :     if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
      79         791 :         if      (sample_rate == 32000) return 1280;
      80         791 :         else if (sample_rate == 44100) return 1764;
      81         791 :         else                           return 1920;
      82             :     }
      83             : 
      84         392 :     av_assert0(sample_rate == 48000);
      85             : 
      86         392 :     return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
      87             :                                             sizeof(sys->audio_samples_dist[0]))];
      88             : }
      89             : 
      90      234298 : static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
      91             : {
      92             :     struct tm tc;
      93             :     time_t ct;
      94             :     uint32_t timecode;
      95             :     va_list ap;
      96      234298 :     int audio_type = 0;
      97             :     int channel;
      98             : 
      99      234298 :     buf[0] = (uint8_t)pack_id;
     100      234298 :     switch (pack_id) {
     101       97080 :     case dv_timecode:
     102       97080 :         timecode  = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
     103       97080 :         timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
     104       97080 :         AV_WB32(buf + 1, timecode);
     105       97080 :         break;
     106         890 :     case dv_audio_source:  /* AAUX source pack */
     107         890 :         va_start(ap, buf);
     108         890 :         channel = va_arg(ap, int);
     109         890 :         if (c->ast[channel]->codecpar->sample_rate == 44100) {
     110           0 :             audio_type = 1;
     111         890 :         } else if (c->ast[channel]->codecpar->sample_rate == 32000)
     112           0 :             audio_type = 2;
     113        1780 :         buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
     114        1780 :                  (1 << 6) | /* reserved -- always 1 */
     115        1780 :                  (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
     116         890 :                   c->sys->audio_min_samples[audio_type]);
     117             :                             /* # of samples      */
     118        1780 :         buf[2] = (0 << 7) | /* multi-stereo      */
     119             :                  (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
     120        1780 :                  (0 << 4) | /* pair bit: 0 -- one pair of channels */
     121         890 :                  !!va_arg(ap, int); /* audio mode        */
     122        1780 :         buf[3] = (1 << 7) | /* res               */
     123         890 :                  (1 << 6) | /* multi-language flag */
     124        2670 :                  (c->sys->dsf << 5) | /*  system: 60fields/50fields */
     125         890 :                  (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
     126        1780 :         buf[4] = (1 << 7) | /* emphasis: 1 -- off */
     127             :                  (0 << 6) | /* emphasis time constant: 0 -- reserved */
     128        1780 :                  (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
     129             :                   0;        /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */
     130             : 
     131         890 :         va_end(ap);
     132         890 :         break;
     133         890 :     case dv_audio_control:
     134         890 :         buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
     135             :                  (1 << 4) | /* input source: 1 -- digital input */
     136             :                  (3 << 2) | /* compression: 3 -- no information */
     137             :                   0;        /* misc. info/SMPTE emphasis off */
     138         890 :         buf[2] = (1 << 7) | /* recording start point: 1 -- no */
     139             :                  (1 << 6) | /* recording end point: 1 -- no */
     140             :                  (1 << 3) | /* recording mode: 1 -- original */
     141             :                   7;
     142        1180 :         buf[3] = (1 << 7) | /* direction: 1 -- forward */
     143         890 :                  (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
     144         290 :                                                        c->sys->ltc_divisor * 4);
     145         890 :         buf[4] = (1 << 7) | /* reserved -- always 1 */
     146             :                   0x7f;     /* genre category */
     147         890 :         break;
     148       65494 :     case dv_audio_recdate:
     149             :     case dv_video_recdate:  /* VAUX recording date */
     150      130988 :         ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
     151       65494 :                                             c->sys->time_base.den, AV_ROUND_DOWN);
     152       65494 :         ff_brktimegm(ct, &tc);
     153       65494 :         buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
     154             :                        /* 0xff is very likely to be "unknown" */
     155      196482 :         buf[2] = (3 << 6) | /* reserved -- always 1 */
     156      196482 :                  ((tc.tm_mday / 10) << 4) | /* Tens of day */
     157       65494 :                  (tc.tm_mday % 10);         /* Units of day */
     158      130988 :         buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
     159      196482 :                  ((tc.tm_mon / 10) << 4) |    /* Tens of month */
     160       65494 :                  (tc.tm_mon  % 10);           /* Units of month */
     161      130988 :         buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
     162       65494 :                  (tc.tm_year % 10);                 /* Units of year */
     163       65494 :         break;
     164       65494 :     case dv_audio_rectime:  /* AAUX recording time */
     165             :     case dv_video_rectime:  /* VAUX recording time */
     166      130988 :         ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
     167       65494 :                                                        c->sys->time_base.den, AV_ROUND_DOWN);
     168       65494 :         ff_brktimegm(ct, &tc);
     169       65494 :         buf[1] = (3 << 6) | /* reserved -- always 1 */
     170             :                  0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
     171      196482 :         buf[2] = (1 << 7) | /* reserved -- always 1 */
     172      196482 :                  ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
     173       65494 :                  (tc.tm_sec % 10);         /* Units of seconds */
     174      196482 :         buf[3] = (1 << 7) | /* reserved -- always 1 */
     175      196482 :                  ((tc.tm_min / 10) << 4) | /* Tens of minutes */
     176       65494 :                  (tc.tm_min % 10);         /* Units of minutes */
     177      196482 :         buf[4] = (3 << 6) | /* reserved -- always 1 */
     178      196482 :                  ((tc.tm_hour / 10) << 4) | /* Tens of hours */
     179       65494 :                  (tc.tm_hour % 10);         /* Units of hours */
     180       65494 :         break;
     181        4450 :     default:
     182        4450 :         buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
     183             :     }
     184      234298 :     return 5;
     185             : }
     186             : 
     187          79 : static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
     188             : {
     189             :     int i, j, d, of, size;
     190          79 :     size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate);
     191          79 :     frame_ptr += channel * c->sys->difseg_size * 150 * 80;
     192         969 :     for (i = 0; i < c->sys->difseg_size; i++) {
     193         890 :         frame_ptr += 6 * 80; /* skip DIF segment header */
     194        8900 :         for (j = 0; j < 9; j++) {
     195        8010 :             dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i >= c->sys->difseg_size/2);
     196      296370 :             for (d = 8; d < 80; d+=2) {
     197      288360 :                 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
     198      288360 :                 if (of*2 >= size)
     199        3468 :                     continue;
     200             : 
     201      284892 :                 frame_ptr[d]   = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
     202      284892 :                 frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2);   //        that DV is a big-endian PCM
     203             :             }
     204        8010 :             frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
     205             :         }
     206             :     }
     207          79 : }
     208             : 
     209         529 : static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
     210             : {
     211             :     int j, k;
     212             :     uint8_t* buf;
     213             : 
     214        8619 :     for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
     215             :         /* DV subcode: 2nd and 3d DIFs */
     216       24270 :         for (j = 80; j < 80 * 3; j += 80) {
     217      113260 :             for (k = 6; k < 6 * 8; k += 8)
     218       97080 :                 dv_write_pack(dv_timecode, c, &buf[j+k]);
     219             : 
     220       16180 :             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 ? */
     221        8032 :                 dv_write_pack(dv_video_recdate, c, &buf[j+14]);
     222        8032 :                 dv_write_pack(dv_video_rectime, c, &buf[j+22]);
     223        8032 :                 dv_write_pack(dv_video_recdate, c, &buf[j+38]);
     224        8032 :                 dv_write_pack(dv_video_rectime, c, &buf[j+46]);
     225             :             }
     226             :         }
     227             : 
     228             :         /* DV VAUX: 4th, 5th and 6th 3DIFs */
     229       32360 :         for (j = 80*3 + 3; j < 80*6; j += 80) {
     230       24270 :             dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
     231       24270 :             dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
     232       24270 :             dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
     233       24270 :             dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
     234             :         }
     235             :     }
     236         529 : }
     237             : 
     238             : /*
     239             :  * The following 3 functions constitute our interface to the world
     240             :  */
     241             : 
     242         665 : static int dv_assemble_frame(AVFormatContext *s,
     243             :                              DVMuxContext *c, AVStream* st,
     244             :                              uint8_t* data, int data_size, uint8_t** frame)
     245             : {
     246             :     int i, reqasize;
     247             : 
     248         665 :     *frame = &c->frame_buf[0];
     249             : 
     250         665 :     switch (st->codecpar->codec_type) {
     251         530 :     case AVMEDIA_TYPE_VIDEO:
     252             :         /* FIXME: we have to have more sensible approach than this one */
     253         530 :         if (c->has_video)
     254           0 :             av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
     255         530 :         if (data_size != c->sys->frame_size) {
     256           0 :             av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
     257           0 :                    data_size, c->sys->frame_size);
     258           0 :             return AVERROR(ENOSYS);
     259             :         }
     260             : 
     261         530 :         memcpy(*frame, data, c->sys->frame_size);
     262         530 :         c->has_video = 1;
     263         530 :         break;
     264         135 :     case AVMEDIA_TYPE_AUDIO:
     265         135 :         for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
     266             : 
     267             :           /* FIXME: we have to have more sensible approach than this one */
     268         135 :         if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE)
     269           0 :             av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
     270         135 :         av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);
     271             : 
     272         135 :         reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);
     273             : 
     274             :         /* Let us see if we've got enough audio for one DV frame. */
     275         135 :         c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
     276             : 
     277         135 :         break;
     278           0 :     default:
     279           0 :         break;
     280             :     }
     281             : 
     282             :     /* Let us see if we have enough data to construct one DV frame. */
     283         665 :     if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
     284         529 :         dv_inject_metadata(c, *frame);
     285         529 :         c->has_audio = 0;
     286         608 :         for (i=0; i < c->n_ast; i++) {
     287          79 :             dv_inject_audio(c, i, *frame);
     288          79 :             reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
     289          79 :             av_fifo_drain(c->audio_data[i], reqasize);
     290          79 :             c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
     291             :         }
     292             : 
     293         529 :         c->has_video = 0;
     294             : 
     295         529 :         c->frames++;
     296             : 
     297         529 :         return c->sys->frame_size;
     298             :     }
     299             : 
     300         136 :     return 0;
     301             : }
     302             : 
     303          12 : static DVMuxContext* dv_init_mux(AVFormatContext* s)
     304             : {
     305          12 :     DVMuxContext *c = s->priv_data;
     306          12 :     AVStream *vst = NULL;
     307             :     int i;
     308             : 
     309             :     /* we support at most 1 video and 2 audio streams */
     310          12 :     if (s->nb_streams > 3)
     311           0 :         return NULL;
     312             : 
     313          12 :     c->n_ast  = 0;
     314          12 :     c->ast[0] = c->ast[1] = NULL;
     315             : 
     316             :     /* We have to sort out where audio and where video stream is */
     317          27 :     for (i=0; i<s->nb_streams; i++) {
     318          15 :         switch (s->streams[i]->codecpar->codec_type) {
     319          12 :         case AVMEDIA_TYPE_VIDEO:
     320          12 :             if (vst) return NULL;
     321          12 :             vst = s->streams[i];
     322          12 :             break;
     323           3 :         case AVMEDIA_TYPE_AUDIO:
     324           3 :             if (c->n_ast > 1) return NULL;
     325           3 :             c->ast[c->n_ast++] = s->streams[i];
     326           3 :             break;
     327           0 :         default:
     328           0 :             goto bail_out;
     329             :         }
     330             :     }
     331             : 
     332             :     /* Some checks -- DV format is very picky about its incoming streams */
     333          12 :     if (!vst || vst->codecpar->codec_id != AV_CODEC_ID_DVVIDEO)
     334             :         goto bail_out;
     335          15 :     for (i=0; i<c->n_ast; i++) {
     336           3 :         if (c->ast[i]) {
     337           6 :             if(c->ast[i]->codecpar->codec_id    != AV_CODEC_ID_PCM_S16LE ||
     338           3 :                c->ast[i]->codecpar->channels    != 2)
     339             :                 goto bail_out;
     340           3 :             if (c->ast[i]->codecpar->sample_rate != 48000 &&
     341           0 :                 c->ast[i]->codecpar->sample_rate != 44100 &&
     342           0 :                 c->ast[i]->codecpar->sample_rate != 32000    )
     343           0 :                 goto bail_out;
     344             :         }
     345             :     }
     346          12 :     c->sys = av_dv_codec_profile2(vst->codecpar->width, vst->codecpar->height,
     347          12 :                                   vst->codecpar->format, vst->time_base);
     348          12 :     if (!c->sys)
     349           0 :         goto bail_out;
     350             : 
     351          12 :     if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
     352           1 :         if (c->ast[0] && c->ast[0]->codecpar->sample_rate != 48000)
     353           0 :             goto bail_out;
     354           1 :         if (c->ast[1] && c->ast[1]->codecpar->sample_rate != 48000)
     355           0 :             goto bail_out;
     356             :     }
     357             : 
     358          12 :     if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
     359             :         /* only 1 stereo pair is allowed in 25Mbps mode */
     360           0 :         goto bail_out;
     361             :     }
     362             : 
     363             :     /* Ok, everything seems to be in working order */
     364          12 :     c->frames     = 0;
     365          12 :     c->has_audio  = 0;
     366          12 :     c->has_video  = 0;
     367          12 :     ff_parse_creation_time_metadata(s, &c->start_time, 1);
     368             : 
     369          15 :     for (i=0; i < c->n_ast; i++) {
     370           3 :         if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) {
     371           0 :             while (i > 0) {
     372           0 :                 i--;
     373           0 :                 av_fifo_freep(&c->audio_data[i]);
     374             :             }
     375           0 :             goto bail_out;
     376             :         }
     377             :     }
     378             : 
     379          12 :     return c;
     380             : 
     381           0 : bail_out:
     382           0 :     return NULL;
     383             : }
     384             : 
     385          12 : static void dv_delete_mux(DVMuxContext *c)
     386             : {
     387             :     int i;
     388          15 :     for (i=0; i < c->n_ast; i++)
     389           3 :         av_fifo_freep(&c->audio_data[i]);
     390          12 : }
     391             : 
     392          12 : static int dv_write_header(AVFormatContext *s)
     393             : {
     394             :     AVRational rate;
     395          12 :     DVMuxContext *dvc = s->priv_data;
     396          12 :     AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
     397             : 
     398          12 :     if (!dv_init_mux(s)) {
     399           0 :         av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
     400             :                     "Make sure that you supply exactly two streams:\n"
     401             :                     "     video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
     402             :                     "     (50Mbps allows an optional second audio stream)\n");
     403           0 :         return -1;
     404             :     }
     405          12 :     rate.num = dvc->sys->ltc_divisor;
     406          12 :     rate.den = 1;
     407          12 :     if (!tcr) { // no global timecode, look into the streams
     408             :         int i;
     409          21 :         for (i = 0; i < s->nb_streams; i++) {
     410          11 :             tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
     411          11 :             if (tcr)
     412           0 :                 break;
     413             :         }
     414             :     }
     415          12 :     if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
     416           2 :         return 0;
     417          10 :     return av_timecode_init(&dvc->tc, rate, 0, 0, s);
     418             : }
     419             : 
     420         665 : static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
     421             : {
     422             :     uint8_t* frame;
     423             :     int fsize;
     424             : 
     425         665 :     fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
     426             :                               pkt->data, pkt->size, &frame);
     427         665 :     if (fsize > 0) {
     428         529 :         avio_write(s->pb, frame, fsize);
     429             :     }
     430         665 :     return 0;
     431             : }
     432             : 
     433             : /*
     434             :  * We might end up with some extra A/V data without matching counterpart.
     435             :  * E.g. video data without enough audio to write the complete frame.
     436             :  * Currently we simply drop the last frame. I don't know whether this
     437             :  * is the best strategy of all
     438             :  */
     439          12 : static int dv_write_trailer(struct AVFormatContext *s)
     440             : {
     441          12 :     dv_delete_mux(s->priv_data);
     442          12 :     return 0;
     443             : }
     444             : 
     445             : AVOutputFormat ff_dv_muxer = {
     446             :     .name              = "dv",
     447             :     .long_name         = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
     448             :     .extensions        = "dv",
     449             :     .priv_data_size    = sizeof(DVMuxContext),
     450             :     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
     451             :     .video_codec       = AV_CODEC_ID_DVVIDEO,
     452             :     .write_header      = dv_write_header,
     453             :     .write_packet      = dv_write_packet,
     454             :     .write_trailer     = dv_write_trailer,
     455             : };

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