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FFmpeg/libavformat/flvdec.c

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  1. /*

  2.  * FLV demuxer

  3.  * Copyright (c) 2003 The FFmpeg Project

  4.  *

  5.  * This demuxer will generate a 1 byte extradata for VP6F content.

  6.  * It is composed of:

  7.  *  - upper 4bits: difference between encoded width and visible width

  8.  *  - lower 4bits: difference between encoded height and visible height

  9.  *

  10.  * This file is part of FFmpeg.

  11.  *

  12.  * FFmpeg is free software; you can redistribute it and/or

  13.  * modify it under the terms of the GNU Lesser General Public

  14.  * License as published by the Free Software Foundation; either

  15.  * version 2.1 of the License, or (at your option) any later version.

  16.  *

  17.  * FFmpeg is distributed in the hope that it will be useful,

  18.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  19.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  20.  * Lesser General Public License for more details.

  21.  *

  22.  * You should have received a copy of the GNU Lesser General Public

  23.  * License along with FFmpeg; if not, write to the Free Software

  24.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  25.  */

  26. 

  27. #include "libavutil/avstring.h"

  28. #include "libavutil/channel_layout.h"

  29. #include "libavutil/dict.h"

  30. #include "libavutil/opt.h"

  31. #include "libavutil/intfloat.h"

  32. #include "libavutil/mathematics.h"

  33. #include "libavcodec/bytestream.h"

  34. #include "libavcodec/mpeg4audio.h"

  35. #include "avformat.h"

  36. #include "internal.h"

  37. #include "avio_internal.h"

  38. #include "flv.h"

  39. 

  40. #define VALIDATE_INDEX_TS_THRESH 2500

  41. 

  42. typedef struct {

  43.     const AVClass *class; ///< Class for private options.

  44.     int trust_metadata;   ///< configure streams according onMetaData

  45.     int wrong_dts;        ///< wrong dts due to negative cts

  46.     uint8_t *new_extradata[FLV_STREAM_TYPE_NB];

  47.     int new_extradata_size[FLV_STREAM_TYPE_NB];

  48.     int last_sample_rate;

  49.     int last_channels;

  50.     struct {

  51.         int64_t dts;

  52.         int64_t pos;

  53.     } validate_index[2];

  54.     int validate_next;

  55.     int validate_count;

  56.     int searched_for_end;

  57. } FLVContext;

  58. 

  59. static int probe(AVProbeData *p, int live)

  60. {

  61.     const uint8_t *d = p->buf;

  62.     unsigned offset = AV_RB32(d + 5);

  63. 

  64.     if (d[0] == 'F' &&

  65.         d[1] == 'L' &&

  66.         d[2] == 'V' &&

  67.         d[3] < 5 && d[5] == 0 &&

  68.         offset + 100 < p->buf_size &&

  69.         offset > 8) {

  70.         int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);

  71. 

  72.         if (live == is_live)

  73.             return AVPROBE_SCORE_MAX;

  74.     }

  75.     return 0;

  76. }

  77. 

  78. static int flv_probe(AVProbeData *p)

  79. {

  80.     return probe(p, 0);

  81. }

  82. 

  83. static int live_flv_probe(AVProbeData *p)

  84. {

  85.     return probe(p, 1);

  86. }

  87. 

  88. static AVStream *create_stream(AVFormatContext *s, int codec_type)

  89. {

  90.     AVStream *st = avformat_new_stream(s, NULL);

  91.     if (!st)

  92.         return NULL;

  93.     st->codec->codec_type = codec_type;

  94.     if (s->nb_streams>=3 ||(   s->nb_streams==2

  95.                            && s->streams[0]->codec->codec_type != AVMEDIA_TYPE_DATA

  96.                            && s->streams[1]->codec->codec_type != AVMEDIA_TYPE_DATA))

  97.         s->ctx_flags &= ~AVFMTCTX_NOHEADER;

  98. 

  99.     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */

  100.     return st;

  101. }

  102. 

  103. static int flv_same_audio_codec(AVCodecContext *acodec, int flags)

  104. {

  105.     int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

  106.     int flv_codecid           = flags & FLV_AUDIO_CODECID_MASK;

  107.     int codec_id;

  108. 

  109.     if (!acodec->codec_id && !acodec->codec_tag)

  110.         return 1;

  111. 

  112.     if (acodec->bits_per_coded_sample != bits_per_coded_sample)

  113.         return 0;

  114. 

  115.     switch (flv_codecid) {

  116.     // no distinction between S16 and S8 PCM codec flags

  117.     case FLV_CODECID_PCM:

  118.         codec_id = bits_per_coded_sample == 8

  119.                    ? AV_CODEC_ID_PCM_U8

  120. #if HAVE_BIGENDIAN

  121.                    : AV_CODEC_ID_PCM_S16BE;

  122. #else

  123.                    : AV_CODEC_ID_PCM_S16LE;

  124. #endif

  125.         return codec_id == acodec->codec_id;

  126.     case FLV_CODECID_PCM_LE:

  127.         codec_id = bits_per_coded_sample == 8

  128.                    ? AV_CODEC_ID_PCM_U8

  129.                    : AV_CODEC_ID_PCM_S16LE;

  130.         return codec_id == acodec->codec_id;

  131.     case FLV_CODECID_AAC:

  132.         return acodec->codec_id == AV_CODEC_ID_AAC;

  133.     case FLV_CODECID_ADPCM:

  134.         return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF;

  135.     case FLV_CODECID_SPEEX:

  136.         return acodec->codec_id == AV_CODEC_ID_SPEEX;

  137.     case FLV_CODECID_MP3:

  138.         return acodec->codec_id == AV_CODEC_ID_MP3;

  139.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

  140.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  141.     case FLV_CODECID_NELLYMOSER:

  142.         return acodec->codec_id == AV_CODEC_ID_NELLYMOSER;

  143.     case FLV_CODECID_PCM_MULAW:

  144.         return acodec->sample_rate == 8000 &&

  145.                acodec->codec_id    == AV_CODEC_ID_PCM_MULAW;

  146.     case FLV_CODECID_PCM_ALAW:

  147.         return acodec->sample_rate == 8000 &&

  148.                acodec->codec_id    == AV_CODEC_ID_PCM_ALAW;

  149.     default:

  150.         return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

  151.     }

  152. }

  153. 

  154. static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,

  155.                                 AVCodecContext *acodec, int flv_codecid)

  156. {

  157.     switch (flv_codecid) {

  158.     // no distinction between S16 and S8 PCM codec flags

  159.     case FLV_CODECID_PCM:

  160.         acodec->codec_id = acodec->bits_per_coded_sample == 8

  161.                            ? AV_CODEC_ID_PCM_U8

  162. #if HAVE_BIGENDIAN

  163.                            : AV_CODEC_ID_PCM_S16BE;

  164. #else

  165.                            : AV_CODEC_ID_PCM_S16LE;

  166. #endif

  167.         break;

  168.     case FLV_CODECID_PCM_LE:

  169.         acodec->codec_id = acodec->bits_per_coded_sample == 8

  170.                            ? AV_CODEC_ID_PCM_U8

  171.                            : AV_CODEC_ID_PCM_S16LE;

  172.         break;

  173.     case FLV_CODECID_AAC:

  174.         acodec->codec_id = AV_CODEC_ID_AAC;

  175.         break;

  176.     case FLV_CODECID_ADPCM:

  177.         acodec->codec_id = AV_CODEC_ID_ADPCM_SWF;

  178.         break;

  179.     case FLV_CODECID_SPEEX:

  180.         acodec->codec_id    = AV_CODEC_ID_SPEEX;

  181.         acodec->sample_rate = 16000;

  182.         break;

  183.     case FLV_CODECID_MP3:

  184.         acodec->codec_id      = AV_CODEC_ID_MP3;

  185.         astream->need_parsing = AVSTREAM_PARSE_FULL;

  186.         break;

  187.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

  188.         // in case metadata does not otherwise declare samplerate

  189.         acodec->sample_rate = 8000;

  190.         acodec->codec_id    = AV_CODEC_ID_NELLYMOSER;

  191.         break;

  192.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  193.         acodec->sample_rate = 16000;

  194.         acodec->codec_id    = AV_CODEC_ID_NELLYMOSER;

  195.         break;

  196.     case FLV_CODECID_NELLYMOSER:

  197.         acodec->codec_id = AV_CODEC_ID_NELLYMOSER;

  198.         break;

  199.     case FLV_CODECID_PCM_MULAW:

  200.         acodec->sample_rate = 8000;

  201.         acodec->codec_id    = AV_CODEC_ID_PCM_MULAW;

  202.         break;

  203.     case FLV_CODECID_PCM_ALAW:

  204.         acodec->sample_rate = 8000;

  205.         acodec->codec_id    = AV_CODEC_ID_PCM_ALAW;

  206.         break;

  207.     default:

  208.         avpriv_request_sample(s, "Audio codec (%x)",

  209.                flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

  210.         acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;

  211.     }

  212. }

  213. 

  214. static int flv_same_video_codec(AVCodecContext *vcodec, int flags)

  215. {

  216.     int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;

  217. 

  218.     if (!vcodec->codec_id && !vcodec->codec_tag)

  219.         return 1;

  220. 

  221.     switch (flv_codecid) {

  222.     case FLV_CODECID_H263:

  223.         return vcodec->codec_id == AV_CODEC_ID_FLV1;

  224.     case FLV_CODECID_SCREEN:

  225.         return vcodec->codec_id == AV_CODEC_ID_FLASHSV;

  226.     case FLV_CODECID_SCREEN2:

  227.         return vcodec->codec_id == AV_CODEC_ID_FLASHSV2;

  228.     case FLV_CODECID_VP6:

  229.         return vcodec->codec_id == AV_CODEC_ID_VP6F;

  230.     case FLV_CODECID_VP6A:

  231.         return vcodec->codec_id == AV_CODEC_ID_VP6A;

  232.     case FLV_CODECID_H264:

  233.         return vcodec->codec_id == AV_CODEC_ID_H264;

  234.     default:

  235.         return vcodec->codec_tag == flv_codecid;

  236.     }

  237. }

  238. 

  239. static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,

  240.                                int flv_codecid, int read)

  241. {

  242.     AVCodecContext *vcodec = vstream->codec;

  243.     switch (flv_codecid) {

  244.     case FLV_CODECID_H263:

  245.         vcodec->codec_id = AV_CODEC_ID_FLV1;

  246.         break;

  247.     case FLV_CODECID_REALH263:

  248.         vcodec->codec_id = AV_CODEC_ID_H263;

  249.         break; // Really mean it this time

  250.     case FLV_CODECID_SCREEN:

  251.         vcodec->codec_id = AV_CODEC_ID_FLASHSV;

  252.         break;

  253.     case FLV_CODECID_SCREEN2:

  254.         vcodec->codec_id = AV_CODEC_ID_FLASHSV2;

  255.         break;

  256.     case FLV_CODECID_VP6:

  257.         vcodec->codec_id = AV_CODEC_ID_VP6F;

  258.     case FLV_CODECID_VP6A:

  259.         if (flv_codecid == FLV_CODECID_VP6A)

  260.             vcodec->codec_id = AV_CODEC_ID_VP6A;

  261.         if (read) {

  262.             if (vcodec->extradata_size != 1) {

  263.                 ff_alloc_extradata(vcodec, 1);

  264.             }

  265.             if (vcodec->extradata)

  266.                 vcodec->extradata[0] = avio_r8(s->pb);

  267.             else

  268.                 avio_skip(s->pb, 1);

  269.         }

  270.         return 1;     // 1 byte body size adjustment for flv_read_packet()

  271.     case FLV_CODECID_H264:

  272.         vcodec->codec_id = AV_CODEC_ID_H264;

  273.         vstream->need_parsing = AVSTREAM_PARSE_HEADERS;

  274.         return 3;     // not 4, reading packet type will consume one byte

  275.     case FLV_CODECID_MPEG4:

  276.         vcodec->codec_id = AV_CODEC_ID_MPEG4;

  277.         return 3;

  278.     default:

  279.         avpriv_request_sample(s, "Video codec (%x)", flv_codecid);

  280.         vcodec->codec_tag = flv_codecid;

  281.     }

  282. 

  283.     return 0;

  284. }

  285. 

  286. static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)

  287. {

  288.     int length = avio_rb16(ioc);

  289.     if (length >= buffsize) {

  290.         avio_skip(ioc, length);

  291.         return -1;

  292.     }

  293. 

  294.     avio_read(ioc, buffer, length);

  295. 

  296.     buffer[length] = '\0';

  297. 

  298.     return length;

  299. }

  300. 

  301. static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc,

  302.                                  AVStream *vstream, int64_t max_pos)

  303. {

  304.     FLVContext *flv       = s->priv_data;

  305.     unsigned int timeslen = 0, fileposlen = 0, i;

  306.     char str_val[256];

  307.     int64_t *times         = NULL;

  308.     int64_t *filepositions = NULL;

  309.     int ret                = AVERROR(ENOSYS);

  310.     int64_t initial_pos    = avio_tell(ioc);

  311. 

  312.     if (vstream->nb_index_entries>0) {

  313.         av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");

  314.         return 0;

  315.     }

  316. 

  317.     if (s->flags & AVFMT_FLAG_IGNIDX)

  318.         return 0;

  319. 

  320.     while (avio_tell(ioc) < max_pos - 2 &&

  321.            amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {

  322.         int64_t **current_array;

  323.         unsigned int arraylen;

  324. 

  325.         // Expect array object in context

  326.         if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)

  327.             break;

  328. 

  329.         arraylen = avio_rb32(ioc);

  330.         if (arraylen>>28)

  331.             break;

  332. 

  333.         if       (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {

  334.             current_array = &times;

  335.             timeslen      = arraylen;

  336.         } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&

  337.                    !filepositions) {

  338.             current_array = &filepositions;

  339.             fileposlen    = arraylen;

  340.         } else

  341.             // unexpected metatag inside keyframes, will not use such

  342.             // metadata for indexing

  343.             break;

  344. 

  345.         if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {

  346.             ret = AVERROR(ENOMEM);

  347.             goto finish;

  348.         }

  349. 

  350.         for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {

  351.             if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)

  352.                 goto invalid;

  353.             current_array[0][i] = av_int2double(avio_rb64(ioc));

  354.         }

  355.         if (times && filepositions) {

  356.             // All done, exiting at a position allowing amf_parse_object

  357.             // to finish parsing the object

  358.             ret = 0;

  359.             break;

  360.         }

  361.     }

  362. 

  363.     if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {

  364.         for (i = 0; i < fileposlen; i++) {

  365.             av_add_index_entry(vstream, filepositions[i], times[i] * 1000,

  366.                                0, 0, AVINDEX_KEYFRAME);

  367.             if (i < 2) {

  368.                 flv->validate_index[i].pos = filepositions[i];

  369.                 flv->validate_index[i].dts = times[i] * 1000;

  370.                 flv->validate_count        = i + 1;

  371.             }

  372.         }

  373.     } else {

  374. invalid:

  375.         av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");

  376.     }

  377. 

  378. finish:

  379.     av_freep(&times);

  380.     av_freep(&filepositions);

  381.     avio_seek(ioc, initial_pos, SEEK_SET);

  382.     return ret;

  383. }

  384. 

  385. static int amf_parse_object(AVFormatContext *s, AVStream *astream,

  386.                             AVStream *vstream, const char *key,

  387.                             int64_t max_pos, int depth)

  388. {

  389.     AVCodecContext *acodec, *vcodec;

  390.     FLVContext *flv = s->priv_data;

  391.     AVIOContext *ioc;

  392.     AMFDataType amf_type;

  393.     char str_val[256];

  394.     double num_val;

  395. 

  396.     num_val  = 0;

  397.     ioc      = s->pb;

  398.     amf_type = avio_r8(ioc);

  399. 

  400.     switch (amf_type) {

  401.     case AMF_DATA_TYPE_NUMBER:

  402.         num_val = av_int2double(avio_rb64(ioc));

  403.         break;

  404.     case AMF_DATA_TYPE_BOOL:

  405.         num_val = avio_r8(ioc);

  406.         break;

  407.     case AMF_DATA_TYPE_STRING:

  408.         if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0)

  409.             return -1;

  410.         break;

  411.     case AMF_DATA_TYPE_OBJECT:

  412.         if ((vstream || astream) && key &&

  413.             ioc->seekable &&

  414.             !strcmp(KEYFRAMES_TAG, key) && depth == 1)

  415.             if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,

  416.                                       max_pos) < 0)

  417.                 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");

  418. 

  419.         while (avio_tell(ioc) < max_pos - 2 &&

  420.                amf_get_string(ioc, str_val, sizeof(str_val)) > 0)

  421.             if (amf_parse_object(s, astream, vstream, str_val, max_pos,

  422.                                  depth + 1) < 0)

  423.                 return -1;     // if we couldn't skip, bomb out.

  424.         if (avio_r8(ioc) != AMF_END_OF_OBJECT)

  425.             return -1;

  426.         break;

  427.     case AMF_DATA_TYPE_NULL:

  428.     case AMF_DATA_TYPE_UNDEFINED:

  429.     case AMF_DATA_TYPE_UNSUPPORTED:

  430.         break;     // these take up no additional space

  431.     case AMF_DATA_TYPE_MIXEDARRAY:

  432.         avio_skip(ioc, 4);     // skip 32-bit max array index

  433.         while (avio_tell(ioc) < max_pos - 2 &&

  434.                amf_get_string(ioc, str_val, sizeof(str_val)) > 0)

  435.             // this is the only case in which we would want a nested

  436.             // parse to not skip over the object

  437.             if (amf_parse_object(s, astream, vstream, str_val, max_pos,

  438.                                  depth + 1) < 0)

  439.                 return -1;

  440.         if (avio_r8(ioc) != AMF_END_OF_OBJECT)

  441.             return -1;

  442.         break;

  443.     case AMF_DATA_TYPE_ARRAY:

  444.     {

  445.         unsigned int arraylen, i;

  446. 

  447.         arraylen = avio_rb32(ioc);

  448.         for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)

  449.             if (amf_parse_object(s, NULL, NULL, NULL, max_pos,

  450.                                  depth + 1) < 0)

  451.                 return -1;      // if we couldn't skip, bomb out.

  452.     }

  453.     break;

  454.     case AMF_DATA_TYPE_DATE:

  455.         avio_skip(ioc, 8 + 2);  // timestamp (double) and UTC offset (int16)

  456.         break;

  457.     default:                    // unsupported type, we couldn't skip

  458.         return -1;

  459.     }

  460. 

  461.     // only look for metadata values when we are not nested and key != NULL

  462.     if (depth == 1 && key) {

  463.         acodec = astream ? astream->codec : NULL;

  464.         vcodec = vstream ? vstream->codec : NULL;

  465. 

  466.         if (amf_type == AMF_DATA_TYPE_NUMBER ||

  467.             amf_type == AMF_DATA_TYPE_BOOL) {

  468.             if (!strcmp(key, "duration"))

  469.                 s->duration = num_val * AV_TIME_BASE;

  470.             else if (!strcmp(key, "videodatarate") && vcodec &&

  471.                      0 <= (int)(num_val * 1024.0))

  472.                 vcodec->bit_rate = num_val * 1024.0;

  473.             else if (!strcmp(key, "audiodatarate") && acodec &&

  474.                      0 <= (int)(num_val * 1024.0))

  475.                 acodec->bit_rate = num_val * 1024.0;

  476.             else if (!strcmp(key, "datastream")) {

  477.                 AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA);

  478.                 if (!st)

  479.                     return AVERROR(ENOMEM);

  480.                 st->codec->codec_id = AV_CODEC_ID_TEXT;

  481.             } else if (flv->trust_metadata) {

  482.                 if (!strcmp(key, "videocodecid") && vcodec) {

  483.                     flv_set_video_codec(s, vstream, num_val, 0);

  484.                 } else if (!strcmp(key, "audiocodecid") && acodec) {

  485.                     int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;

  486.                     flv_set_audio_codec(s, astream, acodec, id);

  487.                 } else if (!strcmp(key, "audiosamplerate") && acodec) {

  488.                     acodec->sample_rate = num_val;

  489.                 } else if (!strcmp(key, "audiosamplesize") && acodec) {

  490.                     acodec->bits_per_coded_sample = num_val;

  491.                 } else if (!strcmp(key, "stereo") && acodec) {

  492.                     acodec->channels       = num_val + 1;

  493.                     acodec->channel_layout = acodec->channels == 2 ?

  494.                                              AV_CH_LAYOUT_STEREO :

  495.                                              AV_CH_LAYOUT_MONO;

  496.                 } else if (!strcmp(key, "width") && vcodec) {

  497.                     vcodec->width = num_val;

  498.                 } else if (!strcmp(key, "height") && vcodec) {

  499.                     vcodec->height = num_val;

  500.                 }

  501.             }

  502.         }

  503. 

  504.         if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&

  505.            ((!acodec && !strcmp(key, "audiocodecid")) ||

  506.             (!vcodec && !strcmp(key, "videocodecid"))))

  507.                 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object

  508. 

  509.         if (!strcmp(key, "duration")        ||

  510.             !strcmp(key, "filesize")        ||

  511.             !strcmp(key, "width")           ||

  512.             !strcmp(key, "height")          ||

  513.             !strcmp(key, "videodatarate")   ||

  514.             !strcmp(key, "framerate")       ||

  515.             !strcmp(key, "videocodecid")    ||

  516.             !strcmp(key, "audiodatarate")   ||

  517.             !strcmp(key, "audiosamplerate") ||

  518.             !strcmp(key, "audiosamplesize") ||

  519.             !strcmp(key, "stereo")          ||

  520.             !strcmp(key, "audiocodecid")    ||

  521.             !strcmp(key, "datastream"))

  522.             return 0;

  523. 

  524.         if (amf_type == AMF_DATA_TYPE_BOOL) {

  525.             av_strlcpy(str_val, num_val > 0 ? "true" : "false",

  526.                        sizeof(str_val));

  527.             av_dict_set(&s->metadata, key, str_val, 0);

  528.         } else if (amf_type == AMF_DATA_TYPE_NUMBER) {

  529.             snprintf(str_val, sizeof(str_val), "%.f", num_val);

  530.             av_dict_set(&s->metadata, key, str_val, 0);

  531.         } else if (amf_type == AMF_DATA_TYPE_STRING)

  532.             av_dict_set(&s->metadata, key, str_val, 0);

  533.     }

  534. 

  535.     return 0;

  536. }

  537. 

  538. static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)

  539. {

  540.     AMFDataType type;

  541.     AVStream *stream, *astream, *vstream;

  542.     AVStream av_unused *dstream;

  543.     AVIOContext *ioc;

  544.     int i;

  545.     // only needs to hold the string "onMetaData".

  546.     // Anything longer is something we don't want.

  547.     char buffer[11];

  548. 

  549.     astream = NULL;

  550.     vstream = NULL;

  551.     dstream = NULL;

  552.     ioc     = s->pb;

  553. 

  554.     // first object needs to be "onMetaData" string

  555.     type = avio_r8(ioc);

  556.     if (type != AMF_DATA_TYPE_STRING ||

  557.         amf_get_string(ioc, buffer, sizeof(buffer)) < 0)

  558.         return -1;

  559. 

  560.     if (!strcmp(buffer, "onTextData"))

  561.         return 1;

  562. 

  563.     if (strcmp(buffer, "onMetaData"))

  564.         return -1;

  565. 

  566.     // find the streams now so that amf_parse_object doesn't need to do

  567.     // the lookup every time it is called.

  568.     for (i = 0; i < s->nb_streams; i++) {

  569.         stream = s->streams[i];

  570.         if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO)

  571.             vstream = stream;

  572.         else if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  573.             astream = stream;

  574.         else if (stream->codec->codec_type == AVMEDIA_TYPE_DATA)

  575.             dstream = stream;

  576.     }

  577. 

  578.     // parse the second object (we want a mixed array)

  579.     if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)

  580.         return -1;

  581. 

  582.     return 0;

  583. }

  584. 

  585. static int flv_read_header(AVFormatContext *s)

  586. {

  587.     int offset, flags;

  588. 

  589.     avio_skip(s->pb, 4);

  590.     flags = avio_r8(s->pb);

  591. 

  592.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  593. 

  594.     if (flags & FLV_HEADER_FLAG_HASVIDEO)

  595.         if (!create_stream(s, AVMEDIA_TYPE_VIDEO))

  596.             return AVERROR(ENOMEM);

  597.     if (flags & FLV_HEADER_FLAG_HASAUDIO)

  598.         if (!create_stream(s, AVMEDIA_TYPE_AUDIO))

  599.             return AVERROR(ENOMEM);

  600.     // Flag doesn't indicate whether or not there is script-data present. Must

  601.     // create that stream if it's encountered.

  602. 

  603.     offset = avio_rb32(s->pb);

  604.     avio_seek(s->pb, offset, SEEK_SET);

  605.     avio_skip(s->pb, 4);

  606. 

  607.     s->start_time = 0;

  608. 

  609.     return 0;

  610. }

  611. 

  612. static int flv_read_close(AVFormatContext *s)

  613. {

  614.     int i;

  615.     FLVContext *flv = s->priv_data;

  616.     for (i=0; i<FLV_STREAM_TYPE_NB; i++)

  617.         av_freep(&flv->new_extradata[i]);

  618.     return 0;

  619. }

  620. 

  621. static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)

  622. {

  623.     av_free(st->codec->extradata);

  624.     if (ff_get_extradata(st->codec, s->pb, size) < 0)

  625.         return AVERROR(ENOMEM);

  626.     return 0;

  627. }

  628. 

  629. static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,

  630.                                int size)

  631. {

  632.     av_free(flv->new_extradata[stream]);

  633.     flv->new_extradata[stream] = av_mallocz(size +

  634.                                             FF_INPUT_BUFFER_PADDING_SIZE);

  635.     if (!flv->new_extradata[stream])

  636.         return AVERROR(ENOMEM);

  637.     flv->new_extradata_size[stream] = size;

  638.     avio_read(pb, flv->new_extradata[stream], size);

  639.     return 0;

  640. }

  641. 

  642. static void clear_index_entries(AVFormatContext *s, int64_t pos)

  643. {

  644.     int i, j, out;

  645.     av_log(s, AV_LOG_WARNING,

  646.            "Found invalid index entries, clearing the index.\n");

  647.     for (i = 0; i < s->nb_streams; i++) {

  648.         AVStream *st = s->streams[i];

  649.         /* Remove all index entries that point to >= pos */

  650.         out = 0;

  651.         for (j = 0; j < st->nb_index_entries; j++)

  652.             if (st->index_entries[j].pos < pos)

  653.                 st->index_entries[out++] = st->index_entries[j];

  654.         st->nb_index_entries = out;

  655.     }

  656. }

  657. 

  658. static int amf_skip_tag(AVIOContext *pb, AMFDataType type)

  659. {

  660.     int nb = -1, ret, parse_name = 1;

  661. 

  662.     switch (type) {

  663.     case AMF_DATA_TYPE_NUMBER:

  664.         avio_skip(pb, 8);

  665.         break;

  666.     case AMF_DATA_TYPE_BOOL:

  667.         avio_skip(pb, 1);

  668.         break;

  669.     case AMF_DATA_TYPE_STRING:

  670.         avio_skip(pb, avio_rb16(pb));

  671.         break;

  672.     case AMF_DATA_TYPE_ARRAY:

  673.         parse_name = 0;

  674.     case AMF_DATA_TYPE_MIXEDARRAY:

  675.         nb = avio_rb32(pb);

  676.     case AMF_DATA_TYPE_OBJECT:

  677.         while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {

  678.             if (parse_name) {

  679.                 int size = avio_rb16(pb);

  680.                 if (!size) {

  681.                     avio_skip(pb, 1);

  682.                     break;

  683.                 }

  684.                 avio_skip(pb, size);

  685.             }

  686.             if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0)

  687.                 return ret;

  688.         }

  689.         break;

  690.     case AMF_DATA_TYPE_NULL:

  691.     case AMF_DATA_TYPE_OBJECT_END:

  692.         break;

  693.     default:

  694.         return AVERROR_INVALIDDATA;

  695.     }

  696.     return 0;

  697. }

  698. 

  699. static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,

  700.                            int64_t dts, int64_t next)

  701. {

  702.     AVIOContext *pb = s->pb;

  703.     AVStream *st    = NULL;

  704.     char buf[20];

  705.     int ret = AVERROR_INVALIDDATA;

  706.     int i, length = -1;

  707. 

  708.     switch (avio_r8(pb)) {

  709.     case AMF_DATA_TYPE_MIXEDARRAY:

  710.         avio_seek(pb, 4, SEEK_CUR);

  711.     case AMF_DATA_TYPE_OBJECT:

  712.         break;

  713.     default:

  714.         goto skip;

  715.     }

  716. 

  717.     while ((ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {

  718.         AMFDataType type = avio_r8(pb);

  719.         if (type == AMF_DATA_TYPE_STRING && !strcmp(buf, "text")) {

  720.             length = avio_rb16(pb);

  721.             ret    = av_get_packet(pb, pkt, length);

  722.             if (ret < 0)

  723.                 goto skip;

  724.             else

  725.                 break;

  726.         } else {

  727.             if ((ret = amf_skip_tag(pb, type)) < 0)

  728.                 goto skip;

  729.         }

  730.     }

  731. 

  732.     if (length < 0) {

  733.         ret = AVERROR_INVALIDDATA;

  734.         goto skip;

  735.     }

  736. 

  737.     for (i = 0; i < s->nb_streams; i++) {

  738.         st = s->streams[i];

  739.         if (st->codec->codec_type == AVMEDIA_TYPE_DATA)

  740.             break;

  741.     }

  742. 

  743.     if (i == s->nb_streams) {

  744.         st = create_stream(s, AVMEDIA_TYPE_DATA);

  745.         if (!st)

  746.             return AVERROR_INVALIDDATA;

  747.         st->codec->codec_id = AV_CODEC_ID_TEXT;

  748.     }

  749. 

  750.     pkt->dts  = dts;

  751.     pkt->pts  = dts;

  752.     pkt->size = ret;

  753. 

  754.     pkt->stream_index = st->index;

  755.     pkt->flags       |= AV_PKT_FLAG_KEY;

  756. 

  757. skip:

  758.     avio_seek(s->pb, next + 4, SEEK_SET);

  759. 

  760.     return ret;

  761. }

  762. 

  763. static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)

  764. {

  765.     FLVContext *flv = s->priv_data;

  766.     int ret, i, type, size, flags;

  767.     int stream_type=-1;

  768.     int64_t next, pos, meta_pos;

  769.     int64_t dts, pts = AV_NOPTS_VALUE;

  770.     int av_uninit(channels);

  771.     int av_uninit(sample_rate);

  772.     AVStream *st    = NULL;

  773. 

  774.     /* pkt size is repeated at end. skip it */

  775.     for (;; avio_skip(s->pb, 4)) {

  776.         pos  = avio_tell(s->pb);

  777.         type = avio_r8(s->pb);

  778.         size = avio_rb24(s->pb);

  779.         dts  = avio_rb24(s->pb);

  780.         dts |= avio_r8(s->pb) << 24;

  781.         av_dlog(s, "type:%d, size:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, dts, avio_tell(s->pb));

  782.         if (url_feof(s->pb))

  783.             return AVERROR_EOF;

  784.         avio_skip(s->pb, 3); /* stream id, always 0 */

  785.         flags = 0;

  786. 

  787.         if (flv->validate_next < flv->validate_count) {

  788.             int64_t validate_pos = flv->validate_index[flv->validate_next].pos;

  789.             if (pos == validate_pos) {

  790.                 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=

  791.                     VALIDATE_INDEX_TS_THRESH) {

  792.                     flv->validate_next++;

  793.                 } else {

  794.                     clear_index_entries(s, validate_pos);

  795.                     flv->validate_count = 0;

  796.                 }

  797.             } else if (pos > validate_pos) {

  798.                 clear_index_entries(s, validate_pos);

  799.                 flv->validate_count = 0;

  800.             }

  801.         }

  802. 

  803.         if (size == 0)

  804.             continue;

  805. 

  806.         next = size + avio_tell(s->pb);

  807. 

  808.         if (type == FLV_TAG_TYPE_AUDIO) {

  809.             stream_type = FLV_STREAM_TYPE_AUDIO;

  810.             flags    = avio_r8(s->pb);

  811.             size--;

  812.         } else if (type == FLV_TAG_TYPE_VIDEO) {

  813.             stream_type = FLV_STREAM_TYPE_VIDEO;

  814.             flags    = avio_r8(s->pb);

  815.             size--;

  816.             if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)

  817.                 goto skip;

  818.         } else if (type == FLV_TAG_TYPE_META) {

  819.             stream_type=FLV_STREAM_TYPE_DATA;

  820.             if (size > 13 + 1 + 4 && dts == 0) { // Header-type metadata stuff

  821.                 meta_pos = avio_tell(s->pb);

  822.                 if (flv_read_metabody(s, next) == 0) {

  823.                     goto skip;

  824.                 }

  825.                 avio_seek(s->pb, meta_pos, SEEK_SET);

  826.             }

  827.         } else {

  828.             av_log(s, AV_LOG_DEBUG,

  829.                    "Skipping flv packet: type %d, size %d, flags %d.\n",

  830.                    type, size, flags);

  831. skip:

  832.             avio_seek(s->pb, next, SEEK_SET);

  833.             continue;

  834.         }

  835. 

  836.         /* skip empty data packets */

  837.         if (!size)

  838.             continue;

  839. 

  840.         /* now find stream */

  841.         for (i = 0; i < s->nb_streams; i++) {

  842.             st = s->streams[i];

  843.             if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  844.                 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

  845.                     (s->audio_codec_id || flv_same_audio_codec(st->codec, flags)))

  846.                     break;

  847.             } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  848.                 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

  849.                     (s->video_codec_id || flv_same_video_codec(st->codec, flags)))

  850.                     break;

  851.             } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  852.                 if (st->codec->codec_type == AVMEDIA_TYPE_DATA)

  853.                     break;

  854.             }

  855.         }

  856.         if (i == s->nb_streams) {

  857.             static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA};

  858.             av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n");

  859.             st = create_stream(s, stream_types[stream_type]);

  860.             if (!st)

  861.                 return AVERROR(ENOMEM);

  862. 

  863.         }

  864.         av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard);

  865.         if (  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))

  866.             ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))

  867.             || st->discard >= AVDISCARD_ALL

  868.         ) {

  869.             avio_seek(s->pb, next, SEEK_SET);

  870.             continue;

  871.         }

  872.         if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || stream_type == FLV_STREAM_TYPE_AUDIO)

  873.             av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);

  874.         break;

  875.     }

  876. 

  877.     // if not streamed and no duration from metadata then seek to end to find

  878.     // the duration from the timestamps

  879.     if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE) && !flv->searched_for_end) {

  880.         int size;

  881.         const int64_t pos   = avio_tell(s->pb);

  882.         int64_t fsize       = avio_size(s->pb);

  883. retry_duration:

  884.         avio_seek(s->pb, fsize - 4, SEEK_SET);

  885.         size = avio_rb32(s->pb);

  886.         avio_seek(s->pb, fsize - 3 - size, SEEK_SET);

  887.         if (size == avio_rb24(s->pb) + 11) {

  888.             uint32_t ts = avio_rb24(s->pb);

  889.             ts         |= avio_r8(s->pb) << 24;

  890.             if (ts)

  891.                 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;

  892.             else if (fsize >= 8 && fsize - 8 >= size) {

  893.                 fsize -= size+4;

  894.                 goto retry_duration;

  895.             }

  896.         }

  897. 

  898.         avio_seek(s->pb, pos, SEEK_SET);

  899.         flv->searched_for_end = 1;

  900.     }

  901. 

  902.     if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  903.         int bits_per_coded_sample;

  904.         channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;

  905.         sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>

  906.                                 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;

  907.         bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

  908.         if (!st->codec->channels || !st->codec->sample_rate ||

  909.             !st->codec->bits_per_coded_sample) {

  910.             st->codec->channels              = channels;

  911.             st->codec->channel_layout        = channels == 1

  912.                                                ? AV_CH_LAYOUT_MONO

  913.                                                : AV_CH_LAYOUT_STEREO;

  914.             st->codec->sample_rate           = sample_rate;

  915.             st->codec->bits_per_coded_sample = bits_per_coded_sample;

  916.         }

  917.         if (!st->codec->codec_id) {

  918.             flv_set_audio_codec(s, st, st->codec,

  919.                                 flags & FLV_AUDIO_CODECID_MASK);

  920.             flv->last_sample_rate =

  921.             sample_rate           = st->codec->sample_rate;

  922.             flv->last_channels    =

  923.             channels              = st->codec->channels;

  924.         } else {

  925.             AVCodecContext ctx = {0};

  926.             ctx.sample_rate = sample_rate;

  927.             flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);

  928.             sample_rate = ctx.sample_rate;

  929.         }

  930.     } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  931.         size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);

  932.     }

  933. 

  934.     if (st->codec->codec_id == AV_CODEC_ID_AAC ||

  935.         st->codec->codec_id == AV_CODEC_ID_H264 ||

  936.         st->codec->codec_id == AV_CODEC_ID_MPEG4) {

  937.         int type = avio_r8(s->pb);

  938.         size--;

  939.         if (st->codec->codec_id == AV_CODEC_ID_H264 || st->codec->codec_id == AV_CODEC_ID_MPEG4) {

  940.             // sign extension

  941.             int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;

  942.             pts = dts + cts;

  943.             if (cts < 0) { // dts might be wrong

  944.                 if (!flv->wrong_dts)

  945.                     av_log(s, AV_LOG_WARNING,

  946.                         "Negative cts, previous timestamps might be wrong.\n");

  947.                 flv->wrong_dts = 1;

  948.             } else if (FFABS(dts - pts) > 1000*60*15) {

  949.                 av_log(s, AV_LOG_WARNING,

  950.                        "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);

  951.                 dts = pts = AV_NOPTS_VALUE;

  952.             }

  953.         }

  954.         if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC)) {

  955.             AVDictionaryEntry *t;

  956. 

  957.             if (st->codec->extradata) {

  958.                 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)

  959.                     return ret;

  960.                 ret = AVERROR(EAGAIN);

  961.                 goto leave;

  962.             }

  963.             if ((ret = flv_get_extradata(s, st, size)) < 0)

  964.                 return ret;

  965. 

  966.             /* Workaround for buggy Omnia A/XE encoder */

  967.             t = av_dict_get(s->metadata, "Encoder", NULL, 0);

  968.             if (st->codec->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))

  969.                 st->codec->extradata_size = 2;

  970. 

  971.             if (st->codec->codec_id == AV_CODEC_ID_AAC && 0) {

  972.                 MPEG4AudioConfig cfg;

  973. 

  974.                 if (avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,

  975.                                              st->codec->extradata_size * 8, 1) >= 0) {

  976.                 st->codec->channels       = cfg.channels;

  977.                 st->codec->channel_layout = 0;

  978.                 if (cfg.ext_sample_rate)

  979.                     st->codec->sample_rate = cfg.ext_sample_rate;

  980.                 else

  981.                     st->codec->sample_rate = cfg.sample_rate;

  982.                 av_dlog(s, "mp4a config channels %d sample rate %d\n",

  983.                         st->codec->channels, st->codec->sample_rate);

  984.                 }

  985.             }

  986. 

  987.             ret = AVERROR(EAGAIN);

  988.             goto leave;

  989.         }

  990.     }

  991. 

  992.     /* skip empty data packets */

  993.     if (!size) {

  994.         ret = AVERROR(EAGAIN);

  995.         goto leave;

  996.     }

  997. 

  998.     ret = av_get_packet(s->pb, pkt, size);

  999.     if (ret < 0)

  1000.         return ret;

  1001.     pkt->dts          = dts;

  1002.     pkt->pts          = pts == AV_NOPTS_VALUE ? dts : pts;

  1003.     pkt->stream_index = st->index;

  1004.     if (flv->new_extradata[stream_type]) {

  1005.         uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,

  1006.                                                 flv->new_extradata_size[stream_type]);

  1007.         if (side) {

  1008.             memcpy(side, flv->new_extradata[stream_type],

  1009.                    flv->new_extradata_size[stream_type]);

  1010.             av_freep(&flv->new_extradata[stream_type]);

  1011.             flv->new_extradata_size[stream_type] = 0;

  1012.         }

  1013.     }

  1014.     if (stream_type == FLV_STREAM_TYPE_AUDIO &&

  1015.                     (sample_rate != flv->last_sample_rate ||

  1016.                      channels    != flv->last_channels)) {

  1017.         flv->last_sample_rate = sample_rate;

  1018.         flv->last_channels    = channels;

  1019.         ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);

  1020.     }

  1021. 

  1022.     if (    stream_type == FLV_STREAM_TYPE_AUDIO ||

  1023.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||

  1024.             stream_type == FLV_STREAM_TYPE_DATA)

  1025.         pkt->flags |= AV_PKT_FLAG_KEY;

  1026. 

  1027. leave:

  1028.     avio_skip(s->pb, 4);

  1029.     return ret;

  1030. }

  1031. 

  1032. static int flv_read_seek(AVFormatContext *s, int stream_index,

  1033.                          int64_t ts, int flags)

  1034. {

  1035.     FLVContext *flv = s->priv_data;

  1036.     flv->validate_count = 0;

  1037.     return avio_seek_time(s->pb, stream_index, ts, flags);

  1038. }

  1039. 

  1040. #define OFFSET(x) offsetof(FLVContext, x)

  1041. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1042. static const AVOption options[] = {

  1043.     { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },

  1044.     { NULL }

  1045. };

  1046. 

  1047. static const AVClass flv_class = {

  1048.     .class_name = "flvdec",

  1049.     .item_name  = av_default_item_name,

  1050.     .option     = options,

  1051.     .version    = LIBAVUTIL_VERSION_INT,

  1052. };

  1053. 

  1054. AVInputFormat ff_flv_demuxer = {

  1055.     .name           = "flv",

  1056.     .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),

  1057.     .priv_data_size = sizeof(FLVContext),

  1058.     .read_probe     = flv_probe,

  1059.     .read_header    = flv_read_header,

  1060.     .read_packet    = flv_read_packet,

  1061.     .read_seek      = flv_read_seek,

  1062.     .read_close     = flv_read_close,

  1063.     .extensions     = "flv",

  1064.     .priv_class     = &flv_class,

  1065. };

  1066. 

  1067. static const AVClass live_flv_class = {

  1068.     .class_name = "live_flvdec",

  1069.     .item_name  = av_default_item_name,

  1070.     .option     = options,

  1071.     .version    = LIBAVUTIL_VERSION_INT,

  1072. };

  1073. 

  1074. AVInputFormat ff_live_flv_demuxer = {

  1075.     .name           = "live_flv",

  1076.     .long_name      = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),

  1077.     .priv_data_size = sizeof(FLVContext),

  1078.     .read_probe     = live_flv_probe,

  1079.     .read_header    = flv_read_header,

  1080.     .read_packet    = flv_read_packet,

  1081.     .read_seek      = flv_read_seek,

  1082.     .read_close     = flv_read_close,

  1083.     .extensions     = "flv",

  1084.     .priv_class     = &live_flv_class,

  1085.     .flags          = AVFMT_TS_DISCONT

  1086. };