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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 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_log(s, AV_LOG_TRACE, "keyframe filepositions = %"PRId64" times = %"PRId64"\n",

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

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

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

  121.         }

  122.     } else

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

  124. 

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

  126.         av_freep(&flv->keyframe_times);

  127.         av_freep(&flv->keyframe_filepositions);

  128.         flv->keyframe_count = 0;

  129.     }

  130. }

  131. 

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

  133. {

  134.     FLVContext *flv   = s->priv_data;

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

  136.     if (!st)

  137.         return NULL;

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

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

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

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

  142.         s->ctx_flags &= ~AVFMTCTX_NOHEADER;

  143.     if (codec_type == AVMEDIA_TYPE_AUDIO)

  144.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;

  145.     if (codec_type == AVMEDIA_TYPE_VIDEO)

  146.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;

  147. 

  148. 

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

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

  151.     add_keyframes_index(s);

  152.     return st;

  153. }

  154. 

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

  156. {

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

  158.     int flv_codecid           = flags & FLV_AUDIO_CODECID_MASK;

  159.     int codec_id;

  160. 

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

  162.         return 1;

  163. 

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

  165.         return 0;

  166. 

  167.     switch (flv_codecid) {

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

  169.     case FLV_CODECID_PCM:

  170.         codec_id = bits_per_coded_sample == 8

  171.                    ? AV_CODEC_ID_PCM_U8

  172. #if HAVE_BIGENDIAN

  173.                    : AV_CODEC_ID_PCM_S16BE;

  174. #else

  175.                    : AV_CODEC_ID_PCM_S16LE;

  176. #endif

  177.         return codec_id == apar->codec_id;

  178.     case FLV_CODECID_PCM_LE:

  179.         codec_id = bits_per_coded_sample == 8

  180.                    ? AV_CODEC_ID_PCM_U8

  181.                    : AV_CODEC_ID_PCM_S16LE;

  182.         return codec_id == apar->codec_id;

  183.     case FLV_CODECID_AAC:

  184.         return apar->codec_id == AV_CODEC_ID_AAC;

  185.     case FLV_CODECID_ADPCM:

  186.         return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;

  187.     case FLV_CODECID_SPEEX:

  188.         return apar->codec_id == AV_CODEC_ID_SPEEX;

  189.     case FLV_CODECID_MP3:

  190.         return apar->codec_id == AV_CODEC_ID_MP3;

  191.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

  192.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  193.     case FLV_CODECID_NELLYMOSER:

  194.         return apar->codec_id == AV_CODEC_ID_NELLYMOSER;

  195.     case FLV_CODECID_PCM_MULAW:

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

  197.                apar->codec_id    == AV_CODEC_ID_PCM_MULAW;

  198.     case FLV_CODECID_PCM_ALAW:

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

  200.                apar->codec_id    == AV_CODEC_ID_PCM_ALAW;

  201.     default:

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

  203.     }

  204. }

  205. 

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

  207.                                 AVCodecParameters *apar, int flv_codecid)

  208. {

  209.     switch (flv_codecid) {

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

  211.     case FLV_CODECID_PCM:

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

  213.                            ? AV_CODEC_ID_PCM_U8

  214. #if HAVE_BIGENDIAN

  215.                            : AV_CODEC_ID_PCM_S16BE;

  216. #else

  217.                            : AV_CODEC_ID_PCM_S16LE;

  218. #endif

  219.         break;

  220.     case FLV_CODECID_PCM_LE:

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

  222.                            ? AV_CODEC_ID_PCM_U8

  223.                            : AV_CODEC_ID_PCM_S16LE;

  224.         break;

  225.     case FLV_CODECID_AAC:

  226.         apar->codec_id = AV_CODEC_ID_AAC;

  227.         break;

  228.     case FLV_CODECID_ADPCM:

  229.         apar->codec_id = AV_CODEC_ID_ADPCM_SWF;

  230.         break;

  231.     case FLV_CODECID_SPEEX:

  232.         apar->codec_id    = AV_CODEC_ID_SPEEX;

  233.         apar->sample_rate = 16000;

  234.         break;

  235.     case FLV_CODECID_MP3:

  236.         apar->codec_id      = AV_CODEC_ID_MP3;

  237.         astream->need_parsing = AVSTREAM_PARSE_FULL;

  238.         break;

  239.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

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

  241.         apar->sample_rate = 8000;

  242.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  243.         break;

  244.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  245.         apar->sample_rate = 16000;

  246.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  247.         break;

  248.     case FLV_CODECID_NELLYMOSER:

  249.         apar->codec_id = AV_CODEC_ID_NELLYMOSER;

  250.         break;

  251.     case FLV_CODECID_PCM_MULAW:

  252.         apar->sample_rate = 8000;

  253.         apar->codec_id    = AV_CODEC_ID_PCM_MULAW;

  254.         break;

  255.     case FLV_CODECID_PCM_ALAW:

  256.         apar->sample_rate = 8000;

  257.         apar->codec_id    = AV_CODEC_ID_PCM_ALAW;

  258.         break;

  259.     default:

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

  261.                flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

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

  263.     }

  264. }

  265. 

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

  267. {

  268.     int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;

  269. 

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

  271.         return 1;

  272. 

  273.     switch (flv_codecid) {

  274.     case FLV_CODECID_H263:

  275.         return vpar->codec_id == AV_CODEC_ID_FLV1;

  276.     case FLV_CODECID_SCREEN:

  277.         return vpar->codec_id == AV_CODEC_ID_FLASHSV;

  278.     case FLV_CODECID_SCREEN2:

  279.         return vpar->codec_id == AV_CODEC_ID_FLASHSV2;

  280.     case FLV_CODECID_VP6:

  281.         return vpar->codec_id == AV_CODEC_ID_VP6F;

  282.     case FLV_CODECID_VP6A:

  283.         return vpar->codec_id == AV_CODEC_ID_VP6A;

  284.     case FLV_CODECID_H264:

  285.         return vpar->codec_id == AV_CODEC_ID_H264;

  286.     default:

  287.         return vpar->codec_tag == flv_codecid;

  288.     }

  289. }

  290. 

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

  292.                                int flv_codecid, int read)

  293. {

  294.     int ret = 0;

  295.     AVCodecParameters *par = vstream->codecpar;

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

  297.     switch (flv_codecid) {

  298.     case FLV_CODECID_H263:

  299.         par->codec_id = AV_CODEC_ID_FLV1;

  300.         break;

  301.     case FLV_CODECID_REALH263:

  302.         par->codec_id = AV_CODEC_ID_H263;

  303.         break; // Really mean it this time

  304.     case FLV_CODECID_SCREEN:

  305.         par->codec_id = AV_CODEC_ID_FLASHSV;

  306.         break;

  307.     case FLV_CODECID_SCREEN2:

  308.         par->codec_id = AV_CODEC_ID_FLASHSV2;

  309.         break;

  310.     case FLV_CODECID_VP6:

  311.         par->codec_id = AV_CODEC_ID_VP6F;

  312.     case FLV_CODECID_VP6A:

  313.         if (flv_codecid == FLV_CODECID_VP6A)

  314.             par->codec_id = AV_CODEC_ID_VP6A;

  315.         if (read) {

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

  317.                 ff_alloc_extradata(par, 1);

  318.             }

  319.             if (par->extradata)

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

  321.             else

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

  323.         }

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

  325.         break;

  326.     case FLV_CODECID_H264:

  327.         par->codec_id = AV_CODEC_ID_H264;

  328.         vstream->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  330.         break;

  331.     case FLV_CODECID_MPEG4:

  332.         par->codec_id = AV_CODEC_ID_MPEG4;

  333.         ret = 3;

  334.         break;

  335.     default:

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

  337.         par->codec_tag = flv_codecid;

  338.     }

  339. 

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

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

  342.         return AVERROR_PATCHWELCOME;

  343.     }

  344. 

  345.     return ret;

  346. }

  347. 

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

  349. {

  350.     int length = avio_rb16(ioc);

  351.     if (length >= buffsize) {

  352.         avio_skip(ioc, length);

  353.         return -1;

  354.     }

  355. 

  356.     avio_read(ioc, buffer, length);

  357. 

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

  359. 

  360.     return length;

  361. }

  362. 

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

  364. {

  365.     FLVContext *flv       = s->priv_data;

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

  367.     char str_val[256];

  368.     int64_t *times         = NULL;

  369.     int64_t *filepositions = NULL;

  370.     int ret                = AVERROR(ENOSYS);

  371.     int64_t initial_pos    = avio_tell(ioc);

  372. 

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

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

  375.         return 0;

  376.     }

  377.     av_assert0(!flv->keyframe_times);

  378.     av_assert0(!flv->keyframe_filepositions);

  379. 

  380.     if (s->flags & AVFMT_FLAG_IGNIDX)

  381.         return 0;

  382. 

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

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

  385.         int64_t **current_array;

  386.         unsigned int arraylen;

  387. 

  388.         // Expect array object in context

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

  390.             break;

  391. 

  392.         arraylen = avio_rb32(ioc);

  393.         if (arraylen>>28)

  394.             break;

  395. 

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

  397.             current_array = &times;

  398.             timeslen      = arraylen;

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

  400.                    !filepositions) {

  401.             current_array = &filepositions;

  402.             fileposlen    = arraylen;

  403.         } else

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

  405.             // metadata for indexing

  406.             break;

  407. 

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

  409.             ret = AVERROR(ENOMEM);

  410.             goto finish;

  411.         }

  412. 

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

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

  415.                 goto invalid;

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

  417.         }

  418.         if (times && filepositions) {

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

  420.             // to finish parsing the object

  421.             ret = 0;

  422.             break;

  423.         }

  424.     }

  425. 

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

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

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

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

  430.             flv->validate_count        = i + 1;

  431.         }

  432.         flv->keyframe_times = times;

  433.         flv->keyframe_filepositions = filepositions;

  434.         flv->keyframe_count = timeslen;

  435.         times = NULL;

  436.         filepositions = NULL;

  437.     } else {

  438. invalid:

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

  440.     }

  441. 

  442. finish:

  443.     av_freep(&times);

  444.     av_freep(&filepositions);

  445.     avio_seek(ioc, initial_pos, SEEK_SET);

  446.     return ret;

  447. }

  448. 

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

  450.                             AVStream *vstream, const char *key,

  451.                             int64_t max_pos, int depth)

  452. {

  453.     AVCodecParameters *apar, *vpar;

  454.     FLVContext *flv = s->priv_data;

  455.     AVIOContext *ioc;

  456.     AMFDataType amf_type;

  457.     char str_val[1024];

  458.     double num_val;

  459. 

  460.     num_val  = 0;

  461.     ioc      = s->pb;

  462.     amf_type = avio_r8(ioc);

  463. 

  464.     switch (amf_type) {

  465.     case AMF_DATA_TYPE_NUMBER:

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

  467.         break;

  468.     case AMF_DATA_TYPE_BOOL:

  469.         num_val = avio_r8(ioc);

  470.         break;

  471.     case AMF_DATA_TYPE_STRING:

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

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

  474.             return -1;

  475.         }

  476.         break;

  477.     case AMF_DATA_TYPE_OBJECT:

  478.         if (key &&

  479.             ioc->seekable &&

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

  481.             if (parse_keyframes_index(s, ioc,

  482.                                       max_pos) < 0)

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

  484.             else

  485.                 add_keyframes_index(s);

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

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

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

  489.                                  depth + 1) < 0)

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

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

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

  493.             return -1;

  494.         }

  495.         break;

  496.     case AMF_DATA_TYPE_NULL:

  497.     case AMF_DATA_TYPE_UNDEFINED:

  498.     case AMF_DATA_TYPE_UNSUPPORTED:

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

  500.     case AMF_DATA_TYPE_MIXEDARRAY:

  501.     {

  502.         unsigned v;

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

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

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

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

  507.             // parse to not skip over the object

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

  509.                                  depth + 1) < 0)

  510.                 return -1;

  511.         v = avio_r8(ioc);

  512.         if (v != AMF_END_OF_OBJECT) {

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

  514.             return -1;

  515.         }

  516.         break;

  517.     }

  518.     case AMF_DATA_TYPE_ARRAY:

  519.     {

  520.         unsigned int arraylen, i;

  521. 

  522.         arraylen = avio_rb32(ioc);

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

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

  525.                                  depth + 1) < 0)

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

  527.     }

  528.     break;

  529.     case AMF_DATA_TYPE_DATE:

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

  531.         break;

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

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

  534.         return -1;

  535.     }

  536. 

  537.     if (key) {

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

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

  540. 

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

  542.         if (depth == 1) {

  543.             if (amf_type == AMF_DATA_TYPE_NUMBER ||

  544.                 amf_type == AMF_DATA_TYPE_BOOL) {

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

  546.                     s->duration = num_val * AV_TIME_BASE;

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

  548.                          0 <= (int)(num_val * 1024.0))

  549.                     vpar->bit_rate = num_val * 1024.0;

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

  551.                          0 <= (int)(num_val * 1024.0))

  552.                     apar->bit_rate = num_val * 1024.0;

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

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

  555.                     if (!st)

  556.                         return AVERROR(ENOMEM);

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

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

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

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

  561.                         if (ret < 0)

  562.                             return ret;

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

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

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

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

  567.                         apar->sample_rate = num_val;

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

  569.                         apar->bits_per_coded_sample = num_val;

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

  571.                         apar->channels       = num_val + 1;

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

  573.                                                AV_CH_LAYOUT_STEREO :

  574.                                                AV_CH_LAYOUT_MONO;

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

  576.                         vpar->width = num_val;

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

  578.                         vpar->height = num_val;

  579.                     }

  580.                 }

  581.             }

  582.             if (amf_type == AMF_DATA_TYPE_STRING) {

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

  584.                     int version = -1;

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

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

  587.                             flv->broken_sizes = 1;

  588.                     }

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

  590.                     flv->broken_sizes = 1;

  591.                 }

  592.             }

  593.         }

  594. 

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

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

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

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

  599. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  613.             return 0;

  614. 

  615.         s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;

  616.         if (amf_type == AMF_DATA_TYPE_BOOL) {

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

  618.                        sizeof(str_val));

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

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

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

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

  623.         } else if (amf_type == AMF_DATA_TYPE_STRING)

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

  625.     }

  626. 

  627.     return 0;

  628. }

  629. 

  630. #define TYPE_ONTEXTDATA 1

  631. #define TYPE_ONCAPTION 2

  632. #define TYPE_ONCAPTIONINFO 3

  633. #define TYPE_UNKNOWN 9

  634. 

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

  636. {

  637.     FLVContext *flv = s->priv_data;

  638.     AMFDataType type;

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

  640.     AVStream av_unused *dstream;

  641.     AVIOContext *ioc;

  642.     int i;

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

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

  645.     char buffer[32];

  646. 

  647.     astream = NULL;

  648.     vstream = NULL;

  649.     dstream = NULL;

  650.     ioc     = s->pb;

  651. 

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

  653.     type = avio_r8(ioc);

  654.     if (type != AMF_DATA_TYPE_STRING ||

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

  656.         return TYPE_UNKNOWN;

  657. 

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

  659.         return TYPE_ONTEXTDATA;

  660. 

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

  662.         return TYPE_ONCAPTION;

  663. 

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

  665.         return TYPE_ONCAPTIONINFO;

  666. 

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

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

  669.         return TYPE_UNKNOWN;

  670.     }

  671. 

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

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

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

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

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

  677.             vstream = stream;

  678.             flv->last_keyframe_stream_index = i;

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

  680.             astream = stream;

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

  682.                 flv->last_keyframe_stream_index = i;

  683.         }

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

  685.             dstream = stream;

  686.     }

  687. 

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

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

  690.         return -1;

  691. 

  692.     return 0;

  693. }

  694. 

  695. static int flv_read_header(AVFormatContext *s)

  696. {

  697.     int flags;

  698.     FLVContext *flv = s->priv_data;

  699.     int offset;

  700. 

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

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

  703. 

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

  705. 

  706.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  707. 

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

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

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

  711. 

  712.     s->start_time = 0;

  713.     flv->sum_flv_tag_size = 0;

  714.     flv->last_keyframe_stream_index = -1;

  715. 

  716.     return 0;

  717. }

  718. 

  719. static int flv_read_close(AVFormatContext *s)

  720. {

  721.     int i;

  722.     FLVContext *flv = s->priv_data;

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

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

  725.     av_freep(&flv->keyframe_times);

  726.     av_freep(&flv->keyframe_filepositions);

  727.     return 0;

  728. }

  729. 

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

  731. {

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

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

  734.         return AVERROR(ENOMEM);

  735.     return 0;

  736. }

  737. 

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

  739.                                int size)

  740. {

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

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

  743.                                             AV_INPUT_BUFFER_PADDING_SIZE);

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

  745.         return AVERROR(ENOMEM);

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

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

  748.     return 0;

  749. }

  750. 

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

  752. {

  753.     int i, j, out;

  754.     av_log(s, AV_LOG_WARNING,

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

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

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

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

  759.         out = 0;

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

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

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

  763.         st->nb_index_entries = out;

  764.     }

  765. }

  766. 

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

  768. {

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

  770. 

  771.     switch (type) {

  772.     case AMF_DATA_TYPE_NUMBER:

  773.         avio_skip(pb, 8);

  774.         break;

  775.     case AMF_DATA_TYPE_BOOL:

  776.         avio_skip(pb, 1);

  777.         break;

  778.     case AMF_DATA_TYPE_STRING:

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

  780.         break;

  781.     case AMF_DATA_TYPE_ARRAY:

  782.         parse_name = 0;

  783.     case AMF_DATA_TYPE_MIXEDARRAY:

  784.         nb = avio_rb32(pb);

  785.     case AMF_DATA_TYPE_OBJECT:

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

  787.             if (parse_name) {

  788.                 int size = avio_rb16(pb);

  789.                 if (!size) {

  790.                     avio_skip(pb, 1);

  791.                     break;

  792.                 }

  793.                 avio_skip(pb, size);

  794.             }

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

  796.                 return ret;

  797.         }

  798.         break;

  799.     case AMF_DATA_TYPE_NULL:

  800.     case AMF_DATA_TYPE_OBJECT_END:

  801.         break;

  802.     default:

  803.         return AVERROR_INVALIDDATA;

  804.     }

  805.     return 0;

  806. }

  807. 

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

  809.                            int64_t dts, int64_t next)

  810. {

  811.     AVIOContext *pb = s->pb;

  812.     AVStream *st    = NULL;

  813.     char buf[20];

  814.     int ret = AVERROR_INVALIDDATA;

  815.     int i, length = -1;

  816.     int array = 0;

  817. 

  818.     switch (avio_r8(pb)) {

  819.     case AMF_DATA_TYPE_ARRAY:

  820.         array = 1;

  821.     case AMF_DATA_TYPE_MIXEDARRAY:

  822.         avio_seek(pb, 4, SEEK_CUR);

  823.     case AMF_DATA_TYPE_OBJECT:

  824.         break;

  825.     default:

  826.         goto skip;

  827.     }

  828. 

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

  830.         AMFDataType type = avio_r8(pb);

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

  832.             length = avio_rb16(pb);

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

  834.             if (ret < 0)

  835.                 goto skip;

  836.             else

  837.                 break;

  838.         } else {

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

  840.                 goto skip;

  841.         }

  842.     }

  843. 

  844.     if (length < 0) {

  845.         ret = AVERROR_INVALIDDATA;

  846.         goto skip;

  847.     }

  848. 

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

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

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

  852.             break;

  853.     }

  854. 

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

  856.         st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);

  857.         if (!st)

  858.             return AVERROR(ENOMEM);

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

  860.     }

  861. 

  862.     pkt->dts  = dts;

  863.     pkt->pts  = dts;

  864.     pkt->size = ret;

  865. 

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

  867.     pkt->flags       |= AV_PKT_FLAG_KEY;

  868. 

  869. skip:

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

  871. 

  872.     return ret;

  873. }

  874. 

  875. static int resync(AVFormatContext *s)

  876. {

  877.     FLVContext *flv = s->priv_data;

  878.     int64_t i;

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

  880. 

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

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

  883.         int j1 = j + RESYNC_BUFFER_SIZE;

  884.         flv->resync_buffer[j ] =

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

  886. 

  887.         if (i > 22) {

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

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

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

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

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

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

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

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

  896.                         return 1;

  897.                     }

  898.                 }

  899.             }

  900.         }

  901.     }

  902.     return AVERROR_EOF;

  903. }

  904. 

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

  906. {

  907.     FLVContext *flv = s->priv_data;

  908.     int ret, i, size, flags;

  909.     enum FlvTagType type;

  910.     int stream_type=-1;

  911.     int64_t next, pos, meta_pos;

  912.     int64_t dts, pts = AV_NOPTS_VALUE;

  913.     int av_uninit(channels);

  914.     int av_uninit(sample_rate);

  915.     AVStream *st    = NULL;

  916.     int last = -1;

  917.     int orig_size;

  918. 

  919. retry:

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

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

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

  923.         orig_size =

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

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

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

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

  928.         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));

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

  930.             return AVERROR_EOF;

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

  932.         flags = 0;

  933. 

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

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

  936.             if (pos == validate_pos) {

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

  938.                     VALIDATE_INDEX_TS_THRESH) {

  939.                     flv->validate_next++;

  940.                 } else {

  941.                     clear_index_entries(s, validate_pos);

  942.                     flv->validate_count = 0;

  943.                 }

  944.             } else if (pos > validate_pos) {

  945.                 clear_index_entries(s, validate_pos);

  946.                 flv->validate_count = 0;

  947.             }

  948.         }

  949. 

  950.         if (size == 0) {

  951.             ret = FFERROR_REDO;

  952.             goto leave;

  953.         }

  954. 

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

  956. 

  957.         if (type == FLV_TAG_TYPE_AUDIO) {

  958.             stream_type = FLV_STREAM_TYPE_AUDIO;

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

  960.             size--;

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

  962.             stream_type = FLV_STREAM_TYPE_VIDEO;

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

  964.             size--;

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

  966.                 goto skip;

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

  968.             stream_type=FLV_STREAM_TYPE_DATA;

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

  970.                 int type;

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

  972.                 type = flv_read_metabody(s, next);

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

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

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

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

  977.                     ) {

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

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

  980.                     }

  981.                     goto skip;

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

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

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

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

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

  987.                 }

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

  989.             }

  990.         } else {

  991.             av_log(s, AV_LOG_DEBUG,

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

  993.                    type, size, flags);

  994. skip:

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

  996.             ret = FFERROR_REDO;

  997.             goto leave;

  998.         }

  999. 

  1000.         /* skip empty data packets */

  1001.         if (!size) {

  1002.             ret = FFERROR_REDO;

  1003.             goto leave;

  1004.         }

  1005. 

  1006.         /* now find stream */

  1007.         for (i = 0; i < s->nb_streams; i++) {

  1008.             st = s->streams[i];

  1009.             if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1010.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&

  1011.                     (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))

  1012.                     break;

  1013.             } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1014.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&

  1015.                     (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))

  1016.                     break;

  1017.             } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1018.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)

  1019.                     break;

  1020.             }

  1021.         }

  1022.         if (i == s->nb_streams) {

  1023.             static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};

  1024.             av_log(s, AV_LOG_WARNING, "%s stream discovered after head already parsed\n", av_get_media_type_string(stream_types[stream_type]));

  1025.             st = create_stream(s, stream_types[stream_type]);

  1026.             if (!st)

  1027.                 return AVERROR(ENOMEM);

  1028. 

  1029.         }

  1030.         av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);

  1031. 

  1032.         if (s->pb->seekable &&

  1033.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||

  1034.               stream_type == FLV_STREAM_TYPE_AUDIO))

  1035.             av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);

  1036. 

  1037.         if (  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))

  1038.             ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))

  1039.             || st->discard >= AVDISCARD_ALL

  1040.         ) {

  1041.             avio_seek(s->pb, next, SEEK_SET);

  1042.             ret = FFERROR_REDO;

  1043.             goto leave;

  1044.         }

  1045. 

  1046.     // if not streamed and no duration from metadata then seek to end to find

  1047.     // the duration from the timestamps

  1048.     if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE) &&

  1049.         !flv->searched_for_end) {

  1050.         int size;

  1051.         const int64_t pos   = avio_tell(s->pb);

  1052.         // Read the last 4 bytes of the file, this should be the size of the

  1053.         // previous FLV tag. Use the timestamp of its payload as duration.

  1054.         int64_t fsize       = avio_size(s->pb);

  1055. retry_duration:

  1056.         avio_seek(s->pb, fsize - 4, SEEK_SET);

  1057.         size = avio_rb32(s->pb);

  1058.         if (size > 0 && size < fsize) {

  1059.             // Seek to the start of the last FLV tag at position (fsize - 4 - size)

  1060.             // but skip the byte indicating the type.

  1061.             avio_seek(s->pb, fsize - 3 - size, SEEK_SET);

  1062.             if (size == avio_rb24(s->pb) + 11) {

  1063.                 uint32_t ts = avio_rb24(s->pb);

  1064.                 ts         |= avio_r8(s->pb) << 24;

  1065.                 if (ts)

  1066.                     s->duration = ts * (int64_t)AV_TIME_BASE / 1000;

  1067.                 else if (fsize >= 8 && fsize - 8 >= size) {

  1068.                     fsize -= size+4;

  1069.                     goto retry_duration;

  1070.                 }

  1071.             }

  1072.         }

  1073. 

  1074.         avio_seek(s->pb, pos, SEEK_SET);

  1075.         flv->searched_for_end = 1;

  1076.     }

  1077. 

  1078.     if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1079.         int bits_per_coded_sample;

  1080.         channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;

  1081.         sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>

  1082.                                 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;

  1083.         bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

  1084.         if (!st->codecpar->channels || !st->codecpar->sample_rate ||

  1085.             !st->codecpar->bits_per_coded_sample) {

  1086.             st->codecpar->channels              = channels;

  1087.             st->codecpar->channel_layout        = channels == 1

  1088.                                                ? AV_CH_LAYOUT_MONO

  1089.                                                : AV_CH_LAYOUT_STEREO;

  1090.             st->codecpar->sample_rate           = sample_rate;

  1091.             st->codecpar->bits_per_coded_sample = bits_per_coded_sample;

  1092.         }

  1093.         if (!st->codecpar->codec_id) {

  1094.             flv_set_audio_codec(s, st, st->codecpar,

  1095.                                 flags & FLV_AUDIO_CODECID_MASK);

  1096.             flv->last_sample_rate =

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

  1098.             flv->last_channels    =

  1099.             channels              = st->codecpar->channels;

  1100.         } else {

  1101.             AVCodecParameters *par = avcodec_parameters_alloc();

  1102.             if (!par) {

  1103.                 ret = AVERROR(ENOMEM);

  1104.                 goto leave;

  1105.             }

  1106.             par->sample_rate = sample_rate;

  1107.             par->bits_per_coded_sample = bits_per_coded_sample;

  1108.             flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);

  1109.             sample_rate = par->sample_rate;

  1110.             avcodec_parameters_free(&par);

  1111.         }

  1112.     } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1113.         int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);

  1114.         if (ret < 0)

  1115.             return ret;

  1116.         size -= ret;

  1117.     } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1118.         st->codecpar->codec_id = AV_CODEC_ID_TEXT;

  1119.     }

  1120. 

  1121.     if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1122.         st->codecpar->codec_id == AV_CODEC_ID_H264 ||

  1123.         st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1124.         int type = avio_r8(s->pb);

  1125.         size--;

  1126.         if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1127.             // sign extension

  1128.             int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;

  1129.             pts = dts + cts;

  1130.             if (cts < 0) { // dts might be wrong

  1131.                 if (!flv->wrong_dts)

  1132.                     av_log(s, AV_LOG_WARNING,

  1133.                         "Negative cts, previous timestamps might be wrong.\n");

  1134.                 flv->wrong_dts = 1;

  1135.             } else if (FFABS(dts - pts) > 1000*60*15) {

  1136.                 av_log(s, AV_LOG_WARNING,

  1137.                        "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);

  1138.                 dts = pts = AV_NOPTS_VALUE;

  1139.             }

  1140.         }

  1141.         if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1142.             st->codecpar->codec_id == AV_CODEC_ID_H264)) {

  1143.             AVDictionaryEntry *t;

  1144. 

  1145.             if (st->codecpar->extradata) {

  1146.                 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)

  1147.                     return ret;

  1148.                 ret = FFERROR_REDO;

  1149.                 goto leave;

  1150.             }

  1151.             if ((ret = flv_get_extradata(s, st, size)) < 0)

  1152.                 return ret;

  1153. 

  1154.             /* Workaround for buggy Omnia A/XE encoder */

  1155.             t = av_dict_get(s->metadata, "Encoder", NULL, 0);

  1156.             if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))

  1157.                 st->codecpar->extradata_size = 2;

  1158. 

  1159.             if (st->codecpar->codec_id == AV_CODEC_ID_AAC && 0) {

  1160.                 MPEG4AudioConfig cfg;

  1161. 

  1162.                 if (avpriv_mpeg4audio_get_config(&cfg, st->codecpar->extradata,

  1163.                                                  st->codecpar->extradata_size * 8, 1) >= 0) {

  1164.                 st->codecpar->channels       = cfg.channels;

  1165.                 st->codecpar->channel_layout = 0;

  1166.                 if (cfg.ext_sample_rate)

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

  1168.                 else

  1169.                     st->codecpar->sample_rate = cfg.sample_rate;

  1170.                 av_log(s, AV_LOG_TRACE, "mp4a config channels %d sample rate %d\n",

  1171.                         st->codecpar->channels, st->codecpar->sample_rate);

  1172.                 }

  1173.             }

  1174. 

  1175.             ret = FFERROR_REDO;

  1176.             goto leave;

  1177.         }

  1178.     }

  1179. 

  1180.     /* skip empty data packets */

  1181.     if (!size) {

  1182.         ret = FFERROR_REDO;

  1183.         goto leave;

  1184.     }

  1185. 

  1186.     ret = av_get_packet(s->pb, pkt, size);

  1187.     if (ret < 0)

  1188.         return ret;

  1189.     pkt->dts          = dts;

  1190.     pkt->pts          = pts == AV_NOPTS_VALUE ? dts : pts;

  1191.     pkt->stream_index = st->index;

  1192.     pkt->pos          = pos;

  1193.     if (flv->new_extradata[stream_type]) {

  1194.         uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,

  1195.                                                 flv->new_extradata_size[stream_type]);

  1196.         if (side) {

  1197.             memcpy(side, flv->new_extradata[stream_type],

  1198.                    flv->new_extradata_size[stream_type]);

  1199.             av_freep(&flv->new_extradata[stream_type]);

  1200.             flv->new_extradata_size[stream_type] = 0;

  1201.         }

  1202.     }

  1203.     if (stream_type == FLV_STREAM_TYPE_AUDIO &&

  1204.                     (sample_rate != flv->last_sample_rate ||

  1205.                      channels    != flv->last_channels)) {

  1206.         flv->last_sample_rate = sample_rate;

  1207.         flv->last_channels    = channels;

  1208.         ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);

  1209.     }

  1210. 

  1211.     if (    stream_type == FLV_STREAM_TYPE_AUDIO ||

  1212.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||

  1213.             stream_type == FLV_STREAM_TYPE_DATA)

  1214.         pkt->flags |= AV_PKT_FLAG_KEY;

  1215. 

  1216. leave:

  1217.     last = avio_rb32(s->pb);

  1218.     if (last != orig_size + 11 && last != orig_size + 10 &&

  1219.         !avio_feof(s->pb) &&

  1220.         (last != orig_size || !last) && last != flv->sum_flv_tag_size &&

  1221.         !flv->broken_sizes) {

  1222.         av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);

  1223.         avio_seek(s->pb, pos + 1, SEEK_SET);

  1224.         ret = resync(s);

  1225.         av_packet_unref(pkt);

  1226.         if (ret >= 0) {

  1227.             goto retry;

  1228.         }

  1229.     }

  1230.     return ret;

  1231. }

  1232. 

  1233. static int flv_read_seek(AVFormatContext *s, int stream_index,

  1234.                          int64_t ts, int flags)

  1235. {

  1236.     FLVContext *flv = s->priv_data;

  1237.     flv->validate_count = 0;

  1238.     return avio_seek_time(s->pb, stream_index, ts, flags);

  1239. }

  1240. 

  1241. #define OFFSET(x) offsetof(FLVContext, x)

  1242. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1243. static const AVOption options[] = {

  1244.     { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

  1245.     { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },

  1246.     { NULL }

  1247. };

  1248. 

  1249. static const AVClass flv_class = {

  1250.     .class_name = "flvdec",

  1251.     .item_name  = av_default_item_name,

  1252.     .option     = options,

  1253.     .version    = LIBAVUTIL_VERSION_INT,

  1254. };

  1255. 

  1256. AVInputFormat ff_flv_demuxer = {

  1257.     .name           = "flv",

  1258.     .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),

  1259.     .priv_data_size = sizeof(FLVContext),

  1260.     .read_probe     = flv_probe,

  1261.     .read_header    = flv_read_header,

  1262.     .read_packet    = flv_read_packet,

  1263.     .read_seek      = flv_read_seek,

  1264.     .read_close     = flv_read_close,

  1265.     .extensions     = "flv",

  1266.     .priv_class     = &flv_class,

  1267. };

  1268. 

  1269. static const AVClass live_flv_class = {

  1270.     .class_name = "live_flvdec",

  1271.     .item_name  = av_default_item_name,

  1272.     .option     = options,

  1273.     .version    = LIBAVUTIL_VERSION_INT,

  1274. };

  1275. 

  1276. AVInputFormat ff_live_flv_demuxer = {

  1277.     .name           = "live_flv",

  1278.     .long_name      = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),

  1279.     .priv_data_size = sizeof(FLVContext),

  1280.     .read_probe     = live_flv_probe,

  1281.     .read_header    = flv_read_header,

  1282.     .read_packet    = flv_read_packet,

  1283.     .read_seek      = flv_read_seek,

  1284.     .read_close     = flv_read_close,

  1285.     .extensions     = "flv",

  1286.     .priv_class     = &live_flv_class,

  1287.     .flags          = AVFMT_TS_DISCONT

  1288. };