falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80939 Commits
32 Branches
333MB
Tree: e90fbc86c1
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'e90fbc86c1'
${ noResults }
FFmpeg/libavformat/flvdec.c

1286 lines
44KB
Raw Blame History 

  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 4 bits: difference between encoded width and visible width

  8.  *  - lower 4 bits: 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. #define RESYNC_BUFFER_SIZE (1<<20)

  43. 

  44. typedef struct FLVContext {

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

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

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

  48.     uint8_t *new_extradata[FLV_STREAM_TYPE_NB];

  49.     int new_extradata_size[FLV_STREAM_TYPE_NB];

  50.     int last_sample_rate;

  51.     int last_channels;

  52.     struct {

  53.         int64_t dts;

  54.         int64_t pos;

  55.     } validate_index[2];

  56.     int validate_next;

  57.     int validate_count;

  58.     int searched_for_end;

  59. 

  60.     uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];

  61. 

  62.     int broken_sizes;

  63.     int sum_flv_tag_size;

  64. 

  65.     int last_keyframe_stream_index;

  66.     int keyframe_count;

  67.     int64_t *keyframe_times;

  68.     int64_t *keyframe_filepositions;

  69.     int missing_streams;

  70. } FLVContext;

  71. 

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

  73. {

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

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

  76. 

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

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

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

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

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

  82.         offset > 8) {

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

  84. 

  85.         if (live == is_live)

  86.             return AVPROBE_SCORE_MAX;

  87.     }

  88.     return 0;

  89. }

  90. 

  91. static int flv_probe(AVProbeData *p)

  92. {

  93.     return probe(p, 0);

  94. }

  95. 

  96. static int live_flv_probe(AVProbeData *p)

  97. {

  98.     return probe(p, 1);

  99. }

  100. 

  101. static void add_keyframes_index(AVFormatContext *s)

  102. {

  103.     FLVContext *flv   = s->priv_data;

  104.     AVStream *stream  = NULL;

  105.     unsigned int i    = 0;

  106. 

  107.     if (flv->last_keyframe_stream_index < 0) {

  108.         av_log(s, AV_LOG_DEBUG, "keyframe stream hasn't been created\n");

  109.         return;

  110.     }

  111. 

  112.     av_assert0(flv->last_keyframe_stream_index <= s->nb_streams);

  113.     stream = s->streams[flv->last_keyframe_stream_index];

  114. 

  115.     if (stream->nb_index_entries == 0) {

  116.         for (i = 0; i < flv->keyframe_count; i++) {

  117.             av_add_index_entry(stream, flv->keyframe_filepositions[i],

  118.                 flv->keyframe_times[i] * 1000, 0, 0, AVINDEX_KEYFRAME);

  119.         }

  120.     } else

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

  122. 

  123.     if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {

  124.         av_freep(&flv->keyframe_times);

  125.         av_freep(&flv->keyframe_filepositions);

  126.         flv->keyframe_count = 0;

  127.     }

  128. }

  129. 

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

  131. {

  132.     FLVContext *flv   = s->priv_data;

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

  134.     if (!st)

  135.         return NULL;

  136.     st->codecpar->codec_type = codec_type;

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

  138.                            && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE

  139.                            && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE))

  140.         s->ctx_flags &= ~AVFMTCTX_NOHEADER;

  141.     if (codec_type == AVMEDIA_TYPE_AUDIO)

  142.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;

  143.     if (codec_type == AVMEDIA_TYPE_VIDEO)

  144.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;

  145. 

  146. 

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

  148.     flv->last_keyframe_stream_index = s->nb_streams - 1;

  149.     add_keyframes_index(s);

  150.     return st;

  151. }

  152. 

  153. static int flv_same_audio_codec(AVCodecParameters *apar, int flags)

  154. {

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

  156.     int flv_codecid           = flags & FLV_AUDIO_CODECID_MASK;

  157.     int codec_id;

  158. 

  159.     if (!apar->codec_id && !apar->codec_tag)

  160.         return 1;

  161. 

  162.     if (apar->bits_per_coded_sample != bits_per_coded_sample)

  163.         return 0;

  164. 

  165.     switch (flv_codecid) {

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

  167.     case FLV_CODECID_PCM:

  168.         codec_id = bits_per_coded_sample == 8

  169.                    ? AV_CODEC_ID_PCM_U8

  170. #if HAVE_BIGENDIAN

  171.                    : AV_CODEC_ID_PCM_S16BE;

  172. #else

  173.                    : AV_CODEC_ID_PCM_S16LE;

  174. #endif

  175.         return codec_id == apar->codec_id;

  176.     case FLV_CODECID_PCM_LE:

  177.         codec_id = bits_per_coded_sample == 8

  178.                    ? AV_CODEC_ID_PCM_U8

  179.                    : AV_CODEC_ID_PCM_S16LE;

  180.         return codec_id == apar->codec_id;

  181.     case FLV_CODECID_AAC:

  182.         return apar->codec_id == AV_CODEC_ID_AAC;

  183.     case FLV_CODECID_ADPCM:

  184.         return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;

  185.     case FLV_CODECID_SPEEX:

  186.         return apar->codec_id == AV_CODEC_ID_SPEEX;

  187.     case FLV_CODECID_MP3:

  188.         return apar->codec_id == AV_CODEC_ID_MP3;

  189.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

  190.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  191.     case FLV_CODECID_NELLYMOSER:

  192.         return apar->codec_id == AV_CODEC_ID_NELLYMOSER;

  193.     case FLV_CODECID_PCM_MULAW:

  194.         return apar->sample_rate == 8000 &&

  195.                apar->codec_id    == AV_CODEC_ID_PCM_MULAW;

  196.     case FLV_CODECID_PCM_ALAW:

  197.         return apar->sample_rate == 8000 &&

  198.                apar->codec_id    == AV_CODEC_ID_PCM_ALAW;

  199.     default:

  200.         return apar->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

  201.     }

  202. }

  203. 

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

  205.                                 AVCodecParameters *apar, int flv_codecid)

  206. {

  207.     switch (flv_codecid) {

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

  209.     case FLV_CODECID_PCM:

  210.         apar->codec_id = apar->bits_per_coded_sample == 8

  211.                            ? AV_CODEC_ID_PCM_U8

  212. #if HAVE_BIGENDIAN

  213.                            : AV_CODEC_ID_PCM_S16BE;

  214. #else

  215.                            : AV_CODEC_ID_PCM_S16LE;

  216. #endif

  217.         break;

  218.     case FLV_CODECID_PCM_LE:

  219.         apar->codec_id = apar->bits_per_coded_sample == 8

  220.                            ? AV_CODEC_ID_PCM_U8

  221.                            : AV_CODEC_ID_PCM_S16LE;

  222.         break;

  223.     case FLV_CODECID_AAC:

  224.         apar->codec_id = AV_CODEC_ID_AAC;

  225.         break;

  226.     case FLV_CODECID_ADPCM:

  227.         apar->codec_id = AV_CODEC_ID_ADPCM_SWF;

  228.         break;

  229.     case FLV_CODECID_SPEEX:

  230.         apar->codec_id    = AV_CODEC_ID_SPEEX;

  231.         apar->sample_rate = 16000;

  232.         break;

  233.     case FLV_CODECID_MP3:

  234.         apar->codec_id      = AV_CODEC_ID_MP3;

  235.         astream->need_parsing = AVSTREAM_PARSE_FULL;

  236.         break;

  237.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

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

  239.         apar->sample_rate = 8000;

  240.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  241.         break;

  242.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  243.         apar->sample_rate = 16000;

  244.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  245.         break;

  246.     case FLV_CODECID_NELLYMOSER:

  247.         apar->codec_id = AV_CODEC_ID_NELLYMOSER;

  248.         break;

  249.     case FLV_CODECID_PCM_MULAW:

  250.         apar->sample_rate = 8000;

  251.         apar->codec_id    = AV_CODEC_ID_PCM_MULAW;

  252.         break;

  253.     case FLV_CODECID_PCM_ALAW:

  254.         apar->sample_rate = 8000;

  255.         apar->codec_id    = AV_CODEC_ID_PCM_ALAW;

  256.         break;

  257.     default:

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

  259.                flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

  260.         apar->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;

  261.     }

  262. }

  263. 

  264. static int flv_same_video_codec(AVCodecParameters *vpar, int flags)

  265. {

  266.     int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;

  267. 

  268.     if (!vpar->codec_id && !vpar->codec_tag)

  269.         return 1;

  270. 

  271.     switch (flv_codecid) {

  272.     case FLV_CODECID_H263:

  273.         return vpar->codec_id == AV_CODEC_ID_FLV1;

  274.     case FLV_CODECID_SCREEN:

  275.         return vpar->codec_id == AV_CODEC_ID_FLASHSV;

  276.     case FLV_CODECID_SCREEN2:

  277.         return vpar->codec_id == AV_CODEC_ID_FLASHSV2;

  278.     case FLV_CODECID_VP6:

  279.         return vpar->codec_id == AV_CODEC_ID_VP6F;

  280.     case FLV_CODECID_VP6A:

  281.         return vpar->codec_id == AV_CODEC_ID_VP6A;

  282.     case FLV_CODECID_H264:

  283.         return vpar->codec_id == AV_CODEC_ID_H264;

  284.     default:

  285.         return vpar->codec_tag == flv_codecid;

  286.     }

  287. }

  288. 

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

  290.                                int flv_codecid, int read)

  291. {

  292.     int ret = 0;

  293.     AVCodecParameters *par = vstream->codecpar;

  294.     enum AVCodecID old_codec_id = vstream->codecpar->codec_id;

  295.     switch (flv_codecid) {

  296.     case FLV_CODECID_H263:

  297.         par->codec_id = AV_CODEC_ID_FLV1;

  298.         break;

  299.     case FLV_CODECID_REALH263:

  300.         par->codec_id = AV_CODEC_ID_H263;

  301.         break; // Really mean it this time

  302.     case FLV_CODECID_SCREEN:

  303.         par->codec_id = AV_CODEC_ID_FLASHSV;

  304.         break;

  305.     case FLV_CODECID_SCREEN2:

  306.         par->codec_id = AV_CODEC_ID_FLASHSV2;

  307.         break;

  308.     case FLV_CODECID_VP6:

  309.         par->codec_id = AV_CODEC_ID_VP6F;

  310.     case FLV_CODECID_VP6A:

  311.         if (flv_codecid == FLV_CODECID_VP6A)

  312.             par->codec_id = AV_CODEC_ID_VP6A;

  313.         if (read) {

  314.             if (par->extradata_size != 1) {

  315.                 ff_alloc_extradata(par, 1);

  316.             }

  317.             if (par->extradata)

  318.                 par->extradata[0] = avio_r8(s->pb);

  319.             else

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

  321.         }

  322.         ret = 1;     // 1 byte body size adjustment for flv_read_packet()

  323.         break;

  324.     case FLV_CODECID_H264:

  325.         par->codec_id = AV_CODEC_ID_H264;

  326.         vstream->need_parsing = AVSTREAM_PARSE_HEADERS;

  327.         ret = 3;     // not 4, reading packet type will consume one byte

  328.         break;

  329.     case FLV_CODECID_MPEG4:

  330.         par->codec_id = AV_CODEC_ID_MPEG4;

  331.         ret = 3;

  332.         break;

  333.     default:

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

  335.         par->codec_tag = flv_codecid;

  336.     }

  337. 

  338.     if (!vstream->internal->need_context_update && par->codec_id != old_codec_id) {

  339.         avpriv_request_sample(s, "Changing the codec id midstream");

  340.         return AVERROR_PATCHWELCOME;

  341.     }

  342. 

  343.     return ret;

  344. }

  345. 

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

  347. {

  348.     int length = avio_rb16(ioc);

  349.     if (length >= buffsize) {

  350.         avio_skip(ioc, length);

  351.         return -1;

  352.     }

  353. 

  354.     avio_read(ioc, buffer, length);

  355. 

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

  357. 

  358.     return length;

  359. }

  360. 

  361. static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t max_pos)

  362. {

  363.     FLVContext *flv       = s->priv_data;

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

  365.     char str_val[256];

  366.     int64_t *times         = NULL;

  367.     int64_t *filepositions = NULL;

  368.     int ret                = AVERROR(ENOSYS);

  369.     int64_t initial_pos    = avio_tell(ioc);

  370. 

  371.     if (flv->keyframe_count > 0) {

  372.         av_log(s, AV_LOG_DEBUG, "keyframes have been paresed\n");

  373.         return 0;

  374.     }

  375.     av_assert0(!flv->keyframe_times);

  376.     av_assert0(!flv->keyframe_filepositions);

  377. 

  378.     if (s->flags & AVFMT_FLAG_IGNIDX)

  379.         return 0;

  380. 

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

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

  383.         int64_t **current_array;

  384.         unsigned int arraylen;

  385. 

  386.         // Expect array object in context

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

  388.             break;

  389. 

  390.         arraylen = avio_rb32(ioc);

  391.         if (arraylen>>28)

  392.             break;

  393. 

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

  395.             current_array = &times;

  396.             timeslen      = arraylen;

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

  398.                    !filepositions) {

  399.             current_array = &filepositions;

  400.             fileposlen    = arraylen;

  401.         } else

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

  403.             // metadata for indexing

  404.             break;

  405. 

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

  407.             ret = AVERROR(ENOMEM);

  408.             goto finish;

  409.         }

  410. 

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

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

  413.                 goto invalid;

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

  415.         }

  416.         if (times && filepositions) {

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

  418.             // to finish parsing the object

  419.             ret = 0;

  420.             break;

  421.         }

  422.     }

  423. 

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

  425.         for (i = 0; i < FFMIN(2,fileposlen); i++) {

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

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

  428.             flv->validate_count        = i + 1;

  429.         }

  430.         flv->keyframe_times = times;

  431.         flv->keyframe_filepositions = filepositions;

  432.         flv->keyframe_count = timeslen;

  433.         times = NULL;

  434.         filepositions = NULL;

  435.     } else {

  436. invalid:

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

  438.     }

  439. 

  440. finish:

  441.     av_freep(&times);

  442.     av_freep(&filepositions);

  443.     avio_seek(ioc, initial_pos, SEEK_SET);

  444.     return ret;

  445. }

  446. 

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

  448.                             AVStream *vstream, const char *key,

  449.                             int64_t max_pos, int depth)

  450. {

  451.     AVCodecParameters *apar, *vpar;

  452.     FLVContext *flv = s->priv_data;

  453.     AVIOContext *ioc;

  454.     AMFDataType amf_type;

  455.     char str_val[1024];

  456.     double num_val;

  457. 

  458.     num_val  = 0;

  459.     ioc      = s->pb;

  460.     amf_type = avio_r8(ioc);

  461. 

  462.     switch (amf_type) {

  463.     case AMF_DATA_TYPE_NUMBER:

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

  465.         break;

  466.     case AMF_DATA_TYPE_BOOL:

  467.         num_val = avio_r8(ioc);

  468.         break;

  469.     case AMF_DATA_TYPE_STRING:

  470.         if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0) {

  471.             av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");

  472.             return -1;

  473.         }

  474.         break;

  475.     case AMF_DATA_TYPE_OBJECT:

  476.         if (key &&

  477.             ioc->seekable &&

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

  479.             if (parse_keyframes_index(s, ioc,

  480.                                       max_pos) < 0)

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

  482.             else

  483.                 add_keyframes_index(s);

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

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

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

  487.                                  depth + 1) < 0)

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

  489.         if (avio_r8(ioc) != AMF_END_OF_OBJECT) {

  490.             av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");

  491.             return -1;

  492.         }

  493.         break;

  494.     case AMF_DATA_TYPE_NULL:

  495.     case AMF_DATA_TYPE_UNDEFINED:

  496.     case AMF_DATA_TYPE_UNSUPPORTED:

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

  498.     case AMF_DATA_TYPE_MIXEDARRAY:

  499.     {

  500.         unsigned v;

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

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

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

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

  505.             // parse to not skip over the object

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

  507.                                  depth + 1) < 0)

  508.                 return -1;

  509.         v = avio_r8(ioc);

  510.         if (v != AMF_END_OF_OBJECT) {

  511.             av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY, found %d\n", v);

  512.             return -1;

  513.         }

  514.         break;

  515.     }

  516.     case AMF_DATA_TYPE_ARRAY:

  517.     {

  518.         unsigned int arraylen, i;

  519. 

  520.         arraylen = avio_rb32(ioc);

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

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

  523.                                  depth + 1) < 0)

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

  525.     }

  526.     break;

  527.     case AMF_DATA_TYPE_DATE:

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

  529.         break;

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

  531.         av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);

  532.         return -1;

  533.     }

  534. 

  535.     if (key) {

  536.         apar = astream ? astream->codecpar : NULL;

  537.         vpar = vstream ? vstream->codecpar : NULL;

  538. 

  539.         // stream info doesn't live any deeper than the first object

  540.         if (depth == 1) {

  541.             if (amf_type == AMF_DATA_TYPE_NUMBER ||

  542.                 amf_type == AMF_DATA_TYPE_BOOL) {

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

  544.                     s->duration = num_val * AV_TIME_BASE;

  545.                 else if (!strcmp(key, "videodatarate") && vpar &&

  546.                          0 <= (int)(num_val * 1024.0))

  547.                     vpar->bit_rate = num_val * 1024.0;

  548.                 else if (!strcmp(key, "audiodatarate") && apar &&

  549.                          0 <= (int)(num_val * 1024.0))

  550.                     apar->bit_rate = num_val * 1024.0;

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

  552.                     AVStream *st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);

  553.                     if (!st)

  554.                         return AVERROR(ENOMEM);

  555.                     st->codecpar->codec_id = AV_CODEC_ID_TEXT;

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

  557.                     if (!strcmp(key, "videocodecid") && vpar) {

  558.                         int ret = flv_set_video_codec(s, vstream, num_val, 0);

  559.                         if (ret < 0)

  560.                             return ret;

  561.                     } else if (!strcmp(key, "audiocodecid") && apar) {

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

  563.                         flv_set_audio_codec(s, astream, apar, id);

  564.                     } else if (!strcmp(key, "audiosamplerate") && apar) {

  565.                         apar->sample_rate = num_val;

  566.                     } else if (!strcmp(key, "audiosamplesize") && apar) {

  567.                         apar->bits_per_coded_sample = num_val;

  568.                     } else if (!strcmp(key, "stereo") && apar) {

  569.                         apar->channels       = num_val + 1;

  570.                         apar->channel_layout = apar->channels == 2 ?

  571.                                                AV_CH_LAYOUT_STEREO :

  572.                                                AV_CH_LAYOUT_MONO;

  573.                     } else if (!strcmp(key, "width") && vpar) {

  574.                         vpar->width = num_val;

  575.                     } else if (!strcmp(key, "height") && vpar) {

  576.                         vpar->height = num_val;

  577.                     }

  578.                 }

  579.             }

  580.             if (amf_type == AMF_DATA_TYPE_STRING) {

  581.                 if (!strcmp(key, "encoder")) {

  582.                     int version = -1;

  583.                     if (1 == sscanf(str_val, "Open Broadcaster Software v0.%d", &version)) {

  584.                         if (version > 0 && version <= 655)

  585.                             flv->broken_sizes = 1;

  586.                     }

  587.                 } else if (!strcmp(key, "metadatacreator") && !strcmp(str_val, "MEGA")) {

  588.                     flv->broken_sizes = 1;

  589.                 }

  590.             }

  591.         }

  592. 

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

  594.            ((!apar && !strcmp(key, "audiocodecid")) ||

  595.             (!vpar && !strcmp(key, "videocodecid"))))

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

  597. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  611.             return 0;

  612. 

  613.         s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;

  614.         if (amf_type == AMF_DATA_TYPE_BOOL) {

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

  616.                        sizeof(str_val));

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

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

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

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

  621.         } else if (amf_type == AMF_DATA_TYPE_STRING)

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

  623.     }

  624. 

  625.     return 0;

  626. }

  627. 

  628. #define TYPE_ONTEXTDATA 1

  629. #define TYPE_ONCAPTION 2

  630. #define TYPE_ONCAPTIONINFO 3

  631. #define TYPE_UNKNOWN 9

  632. 

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

  634. {

  635.     FLVContext *flv = s->priv_data;

  636.     AMFDataType type;

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

  638.     AVStream av_unused *dstream;

  639.     AVIOContext *ioc;

  640.     int i;

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

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

  643.     char buffer[32];

  644. 

  645.     astream = NULL;

  646.     vstream = NULL;

  647.     dstream = NULL;

  648.     ioc     = s->pb;

  649. 

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

  651.     type = avio_r8(ioc);

  652.     if (type != AMF_DATA_TYPE_STRING ||

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

  654.         return TYPE_UNKNOWN;

  655. 

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

  657.         return TYPE_ONTEXTDATA;

  658. 

  659.     if (!strcmp(buffer, "onCaption"))

  660.         return TYPE_ONCAPTION;

  661. 

  662.     if (!strcmp(buffer, "onCaptionInfo"))

  663.         return TYPE_ONCAPTIONINFO;

  664. 

  665.     if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint")) {

  666.         av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);

  667.         return TYPE_UNKNOWN;

  668.     }

  669. 

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

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

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

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

  674.         if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {

  675.             vstream = stream;

  676.             flv->last_keyframe_stream_index = i;

  677.         } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {

  678.             astream = stream;

  679.             if (flv->last_keyframe_stream_index == -1)

  680.                 flv->last_keyframe_stream_index = i;

  681.         }

  682.         else if (stream->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)

  683.             dstream = stream;

  684.     }

  685. 

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

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

  688.         return -1;

  689. 

  690.     return 0;

  691. }

  692. 

  693. static int flv_read_header(AVFormatContext *s)

  694. {

  695.     int flags;

  696.     FLVContext *flv = s->priv_data;

  697.     int offset;

  698. 

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

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

  701. 

  702.     flv->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);

  703. 

  704.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  705. 

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

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

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

  709. 

  710.     s->start_time = 0;

  711.     flv->sum_flv_tag_size = 0;

  712.     flv->last_keyframe_stream_index = -1;

  713. 

  714.     return 0;

  715. }

  716. 

  717. static int flv_read_close(AVFormatContext *s)

  718. {

  719.     int i;

  720.     FLVContext *flv = s->priv_data;

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

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

  723.     av_freep(&flv->keyframe_times);

  724.     av_freep(&flv->keyframe_filepositions);

  725.     return 0;

  726. }

  727. 

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

  729. {

  730.     av_freep(&st->codecpar->extradata);

  731.     if (ff_get_extradata(s, st->codecpar, s->pb, size) < 0)

  732.         return AVERROR(ENOMEM);

  733.     return 0;

  734. }

  735. 

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

  737.                                int size)

  738. {

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

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

  741.                                             AV_INPUT_BUFFER_PADDING_SIZE);

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

  743.         return AVERROR(ENOMEM);

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

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

  746.     return 0;

  747. }

  748. 

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

  750. {

  751.     int i, j, out;

  752.     av_log(s, AV_LOG_WARNING,

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

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

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

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

  757.         out = 0;

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

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

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

  761.         st->nb_index_entries = out;

  762.     }

  763. }

  764. 

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

  766. {

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

  768. 

  769.     switch (type) {

  770.     case AMF_DATA_TYPE_NUMBER:

  771.         avio_skip(pb, 8);

  772.         break;

  773.     case AMF_DATA_TYPE_BOOL:

  774.         avio_skip(pb, 1);

  775.         break;

  776.     case AMF_DATA_TYPE_STRING:

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

  778.         break;

  779.     case AMF_DATA_TYPE_ARRAY:

  780.         parse_name = 0;

  781.     case AMF_DATA_TYPE_MIXEDARRAY:

  782.         nb = avio_rb32(pb);

  783.     case AMF_DATA_TYPE_OBJECT:

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

  785.             if (parse_name) {

  786.                 int size = avio_rb16(pb);

  787.                 if (!size) {

  788.                     avio_skip(pb, 1);

  789.                     break;

  790.                 }

  791.                 avio_skip(pb, size);

  792.             }

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

  794.                 return ret;

  795.         }

  796.         break;

  797.     case AMF_DATA_TYPE_NULL:

  798.     case AMF_DATA_TYPE_OBJECT_END:

  799.         break;

  800.     default:

  801.         return AVERROR_INVALIDDATA;

  802.     }

  803.     return 0;

  804. }

  805. 

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

  807.                            int64_t dts, int64_t next)

  808. {

  809.     AVIOContext *pb = s->pb;

  810.     AVStream *st    = NULL;

  811.     char buf[20];

  812.     int ret = AVERROR_INVALIDDATA;

  813.     int i, length = -1;

  814.     int array = 0;

  815. 

  816.     switch (avio_r8(pb)) {

  817.     case AMF_DATA_TYPE_ARRAY:

  818.         array = 1;

  819.     case AMF_DATA_TYPE_MIXEDARRAY:

  820.         avio_seek(pb, 4, SEEK_CUR);

  821.     case AMF_DATA_TYPE_OBJECT:

  822.         break;

  823.     default:

  824.         goto skip;

  825.     }

  826. 

  827.     while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {

  828.         AMFDataType type = avio_r8(pb);

  829.         if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {

  830.             length = avio_rb16(pb);

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

  832.             if (ret < 0)

  833.                 goto skip;

  834.             else

  835.                 break;

  836.         } else {

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

  838.                 goto skip;

  839.         }

  840.     }

  841. 

  842.     if (length < 0) {

  843.         ret = AVERROR_INVALIDDATA;

  844.         goto skip;

  845.     }

  846. 

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

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

  849.         if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)

  850.             break;

  851.     }

  852. 

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

  854.         st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);

  855.         if (!st)

  856.             return AVERROR(ENOMEM);

  857.         st->codecpar->codec_id = AV_CODEC_ID_TEXT;

  858.     }

  859. 

  860.     pkt->dts  = dts;

  861.     pkt->pts  = dts;

  862.     pkt->size = ret;

  863. 

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

  865.     pkt->flags       |= AV_PKT_FLAG_KEY;

  866. 

  867. skip:

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

  869. 

  870.     return ret;

  871. }

  872. 

  873. static int resync(AVFormatContext *s)

  874. {

  875.     FLVContext *flv = s->priv_data;

  876.     int64_t i;

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

  878. 

  879.     for (i=0; !avio_feof(s->pb); i++) {

  880.         int j  = i & (RESYNC_BUFFER_SIZE-1);

  881.         int j1 = j + RESYNC_BUFFER_SIZE;

  882.         flv->resync_buffer[j ] =

  883.         flv->resync_buffer[j1] = avio_r8(s->pb);

  884. 

  885.         if (i > 22) {

  886.             unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4);

  887.             if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) {

  888.                 unsigned  size2 = AV_RB24(flv->resync_buffer + j1 - lsize2 + 1 - 4);

  889.                 unsigned lsize1 = AV_RB32(flv->resync_buffer + j1 - lsize2 - 8);

  890.                 if (lsize1 >= 11 && lsize1 + 8LL + lsize2 < FFMIN(i, RESYNC_BUFFER_SIZE)) {

  891.                     unsigned  size1 = AV_RB24(flv->resync_buffer + j1 - lsize1 + 1 - lsize2 - 8);

  892.                     if (size1 == lsize1 - 11 && size2  == lsize2 - 11) {

  893.                         avio_seek(s->pb, pos + i - lsize1 - lsize2 - 8, SEEK_SET);

  894.                         return 1;

  895.                     }

  896.                 }

  897.             }

  898.         }

  899.     }

  900.     return AVERROR_EOF;

  901. }

  902. 

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

  904. {

  905.     FLVContext *flv = s->priv_data;

  906.     int ret, i, size, flags;

  907.     enum FlvTagType type;

  908.     int stream_type=-1;

  909.     int64_t next, pos, meta_pos;

  910.     int64_t dts, pts = AV_NOPTS_VALUE;

  911.     int av_uninit(channels);

  912.     int av_uninit(sample_rate);

  913.     AVStream *st    = NULL;

  914.     int last = -1;

  915.     int orig_size;

  916. 

  917. retry:

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

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

  920.         type = (avio_r8(s->pb) & 0x1F);

  921.         orig_size =

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

  923.         flv->sum_flv_tag_size += size + 11;

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

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

  926.         av_log(s, AV_LOG_TRACE, "type:%d, size:%d, last:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, last, dts, avio_tell(s->pb));

  927.         if (avio_feof(s->pb))

  928.             return AVERROR_EOF;

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

  930.         flags = 0;

  931. 

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

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

  934.             if (pos == validate_pos) {

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

  936.                     VALIDATE_INDEX_TS_THRESH) {

  937.                     flv->validate_next++;

  938.                 } else {

  939.                     clear_index_entries(s, validate_pos);

  940.                     flv->validate_count = 0;

  941.                 }

  942.             } else if (pos > validate_pos) {

  943.                 clear_index_entries(s, validate_pos);

  944.                 flv->validate_count = 0;

  945.             }

  946.         }

  947. 

  948.         if (size == 0) {

  949.             ret = FFERROR_REDO;

  950.             goto leave;

  951.         }

  952. 

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

  954. 

  955.         if (type == FLV_TAG_TYPE_AUDIO) {

  956.             stream_type = FLV_STREAM_TYPE_AUDIO;

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

  958.             size--;

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

  960.             stream_type = FLV_STREAM_TYPE_VIDEO;

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

  962.             size--;

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

  964.                 goto skip;

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

  966.             stream_type=FLV_STREAM_TYPE_DATA;

  967.             if (size > 13 + 1 + 4) { // Header-type metadata stuff

  968.                 int type;

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

  970.                 type = flv_read_metabody(s, next);

  971.                 if (type == 0 && dts == 0 || type < 0 || type == TYPE_UNKNOWN) {

  972.                     if (type < 0 && flv->validate_count &&

  973.                         flv->validate_index[0].pos     > next &&

  974.                         flv->validate_index[0].pos - 4 < next

  975.                     ) {

  976.                         av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");

  977.                         next = flv->validate_index[0].pos - 4;

  978.                     }

  979.                     goto skip;

  980.                 } else if (type == TYPE_ONTEXTDATA) {

  981.                     avpriv_request_sample(s, "OnTextData packet");

  982.                     return flv_data_packet(s, pkt, dts, next);

  983.                 } else if (type == TYPE_ONCAPTION) {

  984.                     return flv_data_packet(s, pkt, dts, next);

  985.                 }

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

  987.             }

  988.         } else {

  989.             av_log(s, AV_LOG_DEBUG,

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

  991.                    type, size, flags);

  992. skip:

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

  994.             ret = FFERROR_REDO;

  995.             goto leave;

  996.         }

  997. 

  998.         /* skip empty data packets */

  999.         if (!size) {

  1000.             ret = FFERROR_REDO;

  1001.             goto leave;

  1002.         }

  1003. 

  1004.         /* now find stream */

  1005.         for (i = 0; i < s->nb_streams; i++) {

  1006.             st = s->streams[i];

  1007.             if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1008.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&

  1009.                     (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))

  1010.                     break;

  1011.             } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1012.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&

  1013.                     (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))

  1014.                     break;

  1015.             } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1016.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)

  1017.                     break;

  1018.             }

  1019.         }

  1020.         if (i == s->nb_streams) {

  1021.             static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};

  1022.             av_log(s, AV_LOG_WARNING, "%s stream discovered after head already parsed\n", av_get_media_type_string(stream_types[stream_type]));

  1023.             st = create_stream(s, stream_types[stream_type]);

  1024.             if (!st)

  1025.                 return AVERROR(ENOMEM);

  1026. 

  1027.         }

  1028.         av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);

  1029. 

  1030.         if (s->pb->seekable &&

  1031.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||

  1032.               stream_type == FLV_STREAM_TYPE_AUDIO))

  1033.             av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);

  1034. 

  1035.         if (  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))

  1036.             ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))

  1037.             || st->discard >= AVDISCARD_ALL

  1038.         ) {

  1039.             avio_seek(s->pb, next, SEEK_SET);

  1040.             ret = FFERROR_REDO;

  1041.             goto leave;

  1042.         }

  1043. 

  1044.     // if not streamed and no duration from metadata then seek to end to find

  1045.     // the duration from the timestamps

  1046.     if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE) &&

  1047.         !flv->searched_for_end) {

  1048.         int size;

  1049.         const int64_t pos   = avio_tell(s->pb);

  1050.         // Read the last 4 bytes of the file, this should be the size of the

  1051.         // previous FLV tag. Use the timestamp of its payload as duration.

  1052.         int64_t fsize       = avio_size(s->pb);

  1053. retry_duration:

  1054.         avio_seek(s->pb, fsize - 4, SEEK_SET);

  1055.         size = avio_rb32(s->pb);

  1056.         if (size > 0 && size < fsize) {

  1057.             // Seek to the start of the last FLV tag at position (fsize - 4 - size)

  1058.             // but skip the byte indicating the type.

  1059.             avio_seek(s->pb, fsize - 3 - size, SEEK_SET);

  1060.             if (size == avio_rb24(s->pb) + 11) {

  1061.                 uint32_t ts = avio_rb24(s->pb);

  1062.                 ts         |= avio_r8(s->pb) << 24;

  1063.                 if (ts)

  1064.                     s->duration = ts * (int64_t)AV_TIME_BASE / 1000;

  1065.                 else if (fsize >= 8 && fsize - 8 >= size) {

  1066.                     fsize -= size+4;

  1067.                     goto retry_duration;

  1068.                 }

  1069.             }

  1070.         }

  1071. 

  1072.         avio_seek(s->pb, pos, SEEK_SET);

  1073.         flv->searched_for_end = 1;

  1074.     }

  1075. 

  1076.     if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1077.         int bits_per_coded_sample;

  1078.         channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;

  1079.         sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>

  1080.                                 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;

  1081.         bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

  1082.         if (!st->codecpar->channels || !st->codecpar->sample_rate ||

  1083.             !st->codecpar->bits_per_coded_sample) {

  1084.             st->codecpar->channels              = channels;

  1085.             st->codecpar->channel_layout        = channels == 1

  1086.                                                ? AV_CH_LAYOUT_MONO

  1087.                                                : AV_CH_LAYOUT_STEREO;

  1088.             st->codecpar->sample_rate           = sample_rate;

  1089.             st->codecpar->bits_per_coded_sample = bits_per_coded_sample;

  1090.         }

  1091.         if (!st->codecpar->codec_id) {

  1092.             flv_set_audio_codec(s, st, st->codecpar,

  1093.                                 flags & FLV_AUDIO_CODECID_MASK);

  1094.             flv->last_sample_rate =

  1095.             sample_rate           = st->codecpar->sample_rate;

  1096.             flv->last_channels    =

  1097.             channels              = st->codecpar->channels;

  1098.         } else {

  1099.             AVCodecParameters *par = avcodec_parameters_alloc();

  1100.             if (!par) {

  1101.                 ret = AVERROR(ENOMEM);

  1102.                 goto leave;

  1103.             }

  1104.             par->sample_rate = sample_rate;

  1105.             par->bits_per_coded_sample = bits_per_coded_sample;

  1106.             flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);

  1107.             sample_rate = par->sample_rate;

  1108.             avcodec_parameters_free(&par);

  1109.         }

  1110.     } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1111.         int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);

  1112.         if (ret < 0)

  1113.             return ret;

  1114.         size -= ret;

  1115.     } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1116.         st->codecpar->codec_id = AV_CODEC_ID_TEXT;

  1117.     }

  1118. 

  1119.     if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1120.         st->codecpar->codec_id == AV_CODEC_ID_H264 ||

  1121.         st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1122.         int type = avio_r8(s->pb);

  1123.         size--;

  1124.         if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1125.             // sign extension

  1126.             int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;

  1127.             pts = dts + cts;

  1128.             if (cts < 0) { // dts might be wrong

  1129.                 if (!flv->wrong_dts)

  1130.                     av_log(s, AV_LOG_WARNING,

  1131.                         "Negative cts, previous timestamps might be wrong.\n");

  1132.                 flv->wrong_dts = 1;

  1133.             } else if (FFABS(dts - pts) > 1000*60*15) {

  1134.                 av_log(s, AV_LOG_WARNING,

  1135.                        "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);

  1136.                 dts = pts = AV_NOPTS_VALUE;

  1137.             }

  1138.         }

  1139.         if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1140.             st->codecpar->codec_id == AV_CODEC_ID_H264)) {

  1141.             AVDictionaryEntry *t;

  1142. 

  1143.             if (st->codecpar->extradata) {

  1144.                 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)

  1145.                     return ret;

  1146.                 ret = FFERROR_REDO;

  1147.                 goto leave;

  1148.             }

  1149.             if ((ret = flv_get_extradata(s, st, size)) < 0)

  1150.                 return ret;

  1151. 

  1152.             /* Workaround for buggy Omnia A/XE encoder */

  1153.             t = av_dict_get(s->metadata, "Encoder", NULL, 0);

  1154.             if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))

  1155.                 st->codecpar->extradata_size = 2;

  1156. 

  1157.             if (st->codecpar->codec_id == AV_CODEC_ID_AAC && 0) {

  1158.                 MPEG4AudioConfig cfg;

  1159. 

  1160.                 if (avpriv_mpeg4audio_get_config(&cfg, st->codecpar->extradata,

  1161.                                                  st->codecpar->extradata_size * 8, 1) >= 0) {

  1162.                 st->codecpar->channels       = cfg.channels;

  1163.                 st->codecpar->channel_layout = 0;

  1164.                 if (cfg.ext_sample_rate)

  1165.                     st->codecpar->sample_rate = cfg.ext_sample_rate;

  1166.                 else

  1167.                     st->codecpar->sample_rate = cfg.sample_rate;

  1168.                 av_log(s, AV_LOG_TRACE, "mp4a config channels %d sample rate %d\n",

  1169.                         st->codecpar->channels, st->codecpar->sample_rate);

  1170.                 }

  1171.             }

  1172. 

  1173.             ret = FFERROR_REDO;

  1174.             goto leave;

  1175.         }

  1176.     }

  1177. 

  1178.     /* skip empty data packets */

  1179.     if (!size) {

  1180.         ret = FFERROR_REDO;

  1181.         goto leave;

  1182.     }

  1183. 

  1184.     ret = av_get_packet(s->pb, pkt, size);

  1185.     if (ret < 0)

  1186.         return ret;

  1187.     pkt->dts          = dts;

  1188.     pkt->pts          = pts == AV_NOPTS_VALUE ? dts : pts;

  1189.     pkt->stream_index = st->index;

  1190.     if (flv->new_extradata[stream_type]) {

  1191.         uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,

  1192.                                                 flv->new_extradata_size[stream_type]);

  1193.         if (side) {

  1194.             memcpy(side, flv->new_extradata[stream_type],

  1195.                    flv->new_extradata_size[stream_type]);

  1196.             av_freep(&flv->new_extradata[stream_type]);

  1197.             flv->new_extradata_size[stream_type] = 0;

  1198.         }

  1199.     }

  1200.     if (stream_type == FLV_STREAM_TYPE_AUDIO &&

  1201.                     (sample_rate != flv->last_sample_rate ||

  1202.                      channels    != flv->last_channels)) {

  1203.         flv->last_sample_rate = sample_rate;

  1204.         flv->last_channels    = channels;

  1205.         ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);

  1206.     }

  1207. 

  1208.     if (    stream_type == FLV_STREAM_TYPE_AUDIO ||

  1209.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||

  1210.             stream_type == FLV_STREAM_TYPE_DATA)

  1211.         pkt->flags |= AV_PKT_FLAG_KEY;

  1212. 

  1213. leave:

  1214.     last = avio_rb32(s->pb);

  1215.     if (last != orig_size + 11 && last != orig_size + 10 &&

  1216.         !avio_feof(s->pb) &&

  1217.         (last != orig_size || !last) && last != flv->sum_flv_tag_size &&

  1218.         !flv->broken_sizes) {

  1219.         av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);

  1220.         avio_seek(s->pb, pos + 1, SEEK_SET);

  1221.         ret = resync(s);

  1222.         av_packet_unref(pkt);

  1223.         if (ret >= 0) {

  1224.             goto retry;

  1225.         }

  1226.     }

  1227.     return ret;

  1228. }

  1229. 

  1230. static int flv_read_seek(AVFormatContext *s, int stream_index,

  1231.                          int64_t ts, int flags)

  1232. {

  1233.     FLVContext *flv = s->priv_data;

  1234.     flv->validate_count = 0;

  1235.     return avio_seek_time(s->pb, stream_index, ts, flags);

  1236. }

  1237. 

  1238. #define OFFSET(x) offsetof(FLVContext, x)

  1239. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1240. static const AVOption options[] = {

  1241.     { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

  1242.     { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },

  1243.     { NULL }

  1244. };

  1245. 

  1246. static const AVClass flv_class = {

  1247.     .class_name = "flvdec",

  1248.     .item_name  = av_default_item_name,

  1249.     .option     = options,

  1250.     .version    = LIBAVUTIL_VERSION_INT,

  1251. };

  1252. 

  1253. AVInputFormat ff_flv_demuxer = {

  1254.     .name           = "flv",

  1255.     .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),

  1256.     .priv_data_size = sizeof(FLVContext),

  1257.     .read_probe     = flv_probe,

  1258.     .read_header    = flv_read_header,

  1259.     .read_packet    = flv_read_packet,

  1260.     .read_seek      = flv_read_seek,

  1261.     .read_close     = flv_read_close,

  1262.     .extensions     = "flv",

  1263.     .priv_class     = &flv_class,

  1264. };

  1265. 

  1266. static const AVClass live_flv_class = {

  1267.     .class_name = "live_flvdec",

  1268.     .item_name  = av_default_item_name,

  1269.     .option     = options,

  1270.     .version    = LIBAVUTIL_VERSION_INT,

  1271. };

  1272. 

  1273. AVInputFormat ff_live_flv_demuxer = {

  1274.     .name           = "live_flv",

  1275.     .long_name      = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),

  1276.     .priv_data_size = sizeof(FLVContext),

  1277.     .read_probe     = live_flv_probe,

  1278.     .read_header    = flv_read_header,

  1279.     .read_packet    = flv_read_packet,

  1280.     .read_seek      = flv_read_seek,

  1281.     .read_close     = flv_read_close,

  1282.     .extensions     = "flv",

  1283.     .priv_class     = &live_flv_class,

  1284.     .flags          = AVFMT_TS_DISCONT

  1285. };