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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 trust_datasize;   ///< trust data size of FLVTag

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

  49.     uint8_t *new_extradata[FLV_STREAM_TYPE_NB];

  50.     int new_extradata_size[FLV_STREAM_TYPE_NB];

  51.     int last_sample_rate;

  52.     int last_channels;

  53.     struct {

  54.         int64_t dts;

  55.         int64_t pos;

  56.     } validate_index[2];

  57.     int validate_next;

  58.     int validate_count;

  59.     int searched_for_end;

  60. 

  61.     uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];

  62. 

  63.     int broken_sizes;

  64.     int sum_flv_tag_size;

  65. 

  66.     int last_keyframe_stream_index;

  67.     int keyframe_count;

  68.     int64_t video_bit_rate;

  69.     int64_t audio_bit_rate;

  70.     int64_t *keyframe_times;

  71.     int64_t *keyframe_filepositions;

  72.     int missing_streams;

  73.     AVRational framerate;

  74. } FLVContext;

  75. 

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

  77. {

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

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

  80. 

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

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

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

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

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

  86.         offset > 8) {

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

  88. 

  89.         if (live == is_live)

  90.             return AVPROBE_SCORE_MAX;

  91.     }

  92.     return 0;

  93. }

  94. 

  95. static int flv_probe(AVProbeData *p)

  96. {

  97.     return probe(p, 0);

  98. }

  99. 

  100. static int live_flv_probe(AVProbeData *p)

  101. {

  102.     return probe(p, 1);

  103. }

  104. 

  105. static void add_keyframes_index(AVFormatContext *s)

  106. {

  107.     FLVContext *flv   = s->priv_data;

  108.     AVStream *stream  = NULL;

  109.     unsigned int i    = 0;

  110. 

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

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

  113.         return;

  114.     }

  115. 

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

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

  118. 

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

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

  121.             av_log(s, AV_LOG_TRACE, "keyframe filepositions = %"PRId64" times = %"PRId64"\n",

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

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

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

  125.         }

  126.     } else

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

  128. 

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

  130.         av_freep(&flv->keyframe_times);

  131.         av_freep(&flv->keyframe_filepositions);

  132.         flv->keyframe_count = 0;

  133.     }

  134. }

  135. 

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

  137. {

  138.     FLVContext *flv   = s->priv_data;

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

  140.     if (!st)

  141.         return NULL;

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

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

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

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

  146.         s->ctx_flags &= ~AVFMTCTX_NOHEADER;

  147.     if (codec_type == AVMEDIA_TYPE_AUDIO) {

  148.         st->codecpar->bit_rate = flv->audio_bit_rate;

  149.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;

  150.     }

  151.     if (codec_type == AVMEDIA_TYPE_VIDEO) {

  152.         st->codecpar->bit_rate = flv->video_bit_rate;

  153.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;

  154.         st->avg_frame_rate = flv->framerate;

  155.     }

  156. 

  157. 

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

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

  160.     add_keyframes_index(s);

  161.     return st;

  162. }

  163. 

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

  165. {

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

  167.     int flv_codecid           = flags & FLV_AUDIO_CODECID_MASK;

  168.     int codec_id;

  169. 

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

  171.         return 1;

  172. 

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

  174.         return 0;

  175. 

  176.     switch (flv_codecid) {

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

  178.     case FLV_CODECID_PCM:

  179.         codec_id = bits_per_coded_sample == 8

  180.                    ? AV_CODEC_ID_PCM_U8

  181. #if HAVE_BIGENDIAN

  182.                    : AV_CODEC_ID_PCM_S16BE;

  183. #else

  184.                    : AV_CODEC_ID_PCM_S16LE;

  185. #endif

  186.         return codec_id == apar->codec_id;

  187.     case FLV_CODECID_PCM_LE:

  188.         codec_id = bits_per_coded_sample == 8

  189.                    ? AV_CODEC_ID_PCM_U8

  190.                    : AV_CODEC_ID_PCM_S16LE;

  191.         return codec_id == apar->codec_id;

  192.     case FLV_CODECID_AAC:

  193.         return apar->codec_id == AV_CODEC_ID_AAC;

  194.     case FLV_CODECID_ADPCM:

  195.         return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;

  196.     case FLV_CODECID_SPEEX:

  197.         return apar->codec_id == AV_CODEC_ID_SPEEX;

  198.     case FLV_CODECID_MP3:

  199.         return apar->codec_id == AV_CODEC_ID_MP3;

  200.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

  201.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  202.     case FLV_CODECID_NELLYMOSER:

  203.         return apar->codec_id == AV_CODEC_ID_NELLYMOSER;

  204.     case FLV_CODECID_PCM_MULAW:

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

  206.                apar->codec_id    == AV_CODEC_ID_PCM_MULAW;

  207.     case FLV_CODECID_PCM_ALAW:

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

  209.                apar->codec_id    == AV_CODEC_ID_PCM_ALAW;

  210.     default:

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

  212.     }

  213. }

  214. 

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

  216.                                 AVCodecParameters *apar, int flv_codecid)

  217. {

  218.     switch (flv_codecid) {

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

  220.     case FLV_CODECID_PCM:

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

  222.                            ? AV_CODEC_ID_PCM_U8

  223. #if HAVE_BIGENDIAN

  224.                            : AV_CODEC_ID_PCM_S16BE;

  225. #else

  226.                            : AV_CODEC_ID_PCM_S16LE;

  227. #endif

  228.         break;

  229.     case FLV_CODECID_PCM_LE:

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

  231.                            ? AV_CODEC_ID_PCM_U8

  232.                            : AV_CODEC_ID_PCM_S16LE;

  233.         break;

  234.     case FLV_CODECID_AAC:

  235.         apar->codec_id = AV_CODEC_ID_AAC;

  236.         break;

  237.     case FLV_CODECID_ADPCM:

  238.         apar->codec_id = AV_CODEC_ID_ADPCM_SWF;

  239.         break;

  240.     case FLV_CODECID_SPEEX:

  241.         apar->codec_id    = AV_CODEC_ID_SPEEX;

  242.         apar->sample_rate = 16000;

  243.         break;

  244.     case FLV_CODECID_MP3:

  245.         apar->codec_id      = AV_CODEC_ID_MP3;

  246.         astream->need_parsing = AVSTREAM_PARSE_FULL;

  247.         break;

  248.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

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

  250.         apar->sample_rate = 8000;

  251.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  252.         break;

  253.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  254.         apar->sample_rate = 16000;

  255.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  256.         break;

  257.     case FLV_CODECID_NELLYMOSER:

  258.         apar->codec_id = AV_CODEC_ID_NELLYMOSER;

  259.         break;

  260.     case FLV_CODECID_PCM_MULAW:

  261.         apar->sample_rate = 8000;

  262.         apar->codec_id    = AV_CODEC_ID_PCM_MULAW;

  263.         break;

  264.     case FLV_CODECID_PCM_ALAW:

  265.         apar->sample_rate = 8000;

  266.         apar->codec_id    = AV_CODEC_ID_PCM_ALAW;

  267.         break;

  268.     default:

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

  270.                flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

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

  272.     }

  273. }

  274. 

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

  276. {

  277.     int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;

  278. 

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

  280.         return 1;

  281. 

  282.     switch (flv_codecid) {

  283.     case FLV_CODECID_H263:

  284.         return vpar->codec_id == AV_CODEC_ID_FLV1;

  285.     case FLV_CODECID_SCREEN:

  286.         return vpar->codec_id == AV_CODEC_ID_FLASHSV;

  287.     case FLV_CODECID_SCREEN2:

  288.         return vpar->codec_id == AV_CODEC_ID_FLASHSV2;

  289.     case FLV_CODECID_VP6:

  290.         return vpar->codec_id == AV_CODEC_ID_VP6F;

  291.     case FLV_CODECID_VP6A:

  292.         return vpar->codec_id == AV_CODEC_ID_VP6A;

  293.     case FLV_CODECID_H264:

  294.         return vpar->codec_id == AV_CODEC_ID_H264;

  295.     default:

  296.         return vpar->codec_tag == flv_codecid;

  297.     }

  298. }

  299. 

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

  301.                                int flv_codecid, int read)

  302. {

  303.     int ret = 0;

  304.     AVCodecParameters *par = vstream->codecpar;

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

  306.     switch (flv_codecid) {

  307.     case FLV_CODECID_H263:

  308.         par->codec_id = AV_CODEC_ID_FLV1;

  309.         break;

  310.     case FLV_CODECID_REALH263:

  311.         par->codec_id = AV_CODEC_ID_H263;

  312.         break; // Really mean it this time

  313.     case FLV_CODECID_SCREEN:

  314.         par->codec_id = AV_CODEC_ID_FLASHSV;

  315.         break;

  316.     case FLV_CODECID_SCREEN2:

  317.         par->codec_id = AV_CODEC_ID_FLASHSV2;

  318.         break;

  319.     case FLV_CODECID_VP6:

  320.         par->codec_id = AV_CODEC_ID_VP6F;

  321.     case FLV_CODECID_VP6A:

  322.         if (flv_codecid == FLV_CODECID_VP6A)

  323.             par->codec_id = AV_CODEC_ID_VP6A;

  324.         if (read) {

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

  326.                 ff_alloc_extradata(par, 1);

  327.             }

  328.             if (par->extradata)

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

  330.             else

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

  332.         }

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

  334.         break;

  335.     case FLV_CODECID_H264:

  336.         par->codec_id = AV_CODEC_ID_H264;

  337.         vstream->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  339.         break;

  340.     case FLV_CODECID_MPEG4:

  341.         par->codec_id = AV_CODEC_ID_MPEG4;

  342.         ret = 3;

  343.         break;

  344.     default:

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

  346.         par->codec_tag = flv_codecid;

  347.     }

  348. 

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

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

  351.         return AVERROR_PATCHWELCOME;

  352.     }

  353. 

  354.     return ret;

  355. }

  356. 

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

  358. {

  359.     int length = avio_rb16(ioc);

  360.     if (length >= buffsize) {

  361.         avio_skip(ioc, length);

  362.         return -1;

  363.     }

  364. 

  365.     avio_read(ioc, buffer, length);

  366. 

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

  368. 

  369.     return length;

  370. }

  371. 

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

  373. {

  374.     FLVContext *flv       = s->priv_data;

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

  376.     char str_val[256];

  377.     int64_t *times         = NULL;

  378.     int64_t *filepositions = NULL;

  379.     int ret                = AVERROR(ENOSYS);

  380.     int64_t initial_pos    = avio_tell(ioc);

  381. 

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

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

  384.         return 0;

  385.     }

  386.     av_assert0(!flv->keyframe_times);

  387.     av_assert0(!flv->keyframe_filepositions);

  388. 

  389.     if (s->flags & AVFMT_FLAG_IGNIDX)

  390.         return 0;

  391. 

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

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

  394.         int64_t **current_array;

  395.         unsigned int arraylen;

  396. 

  397.         // Expect array object in context

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

  399.             break;

  400. 

  401.         arraylen = avio_rb32(ioc);

  402.         if (arraylen>>28)

  403.             break;

  404. 

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

  406.             current_array = &times;

  407.             timeslen      = arraylen;

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

  409.                    !filepositions) {

  410.             current_array = &filepositions;

  411.             fileposlen    = arraylen;

  412.         } else

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

  414.             // metadata for indexing

  415.             break;

  416. 

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

  418.             ret = AVERROR(ENOMEM);

  419.             goto finish;

  420.         }

  421. 

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

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

  424.                 goto invalid;

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

  426.         }

  427.         if (times && filepositions) {

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

  429.             // to finish parsing the object

  430.             ret = 0;

  431.             break;

  432.         }

  433.     }

  434. 

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

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

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

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

  439.             flv->validate_count        = i + 1;

  440.         }

  441.         flv->keyframe_times = times;

  442.         flv->keyframe_filepositions = filepositions;

  443.         flv->keyframe_count = timeslen;

  444.         times = NULL;

  445.         filepositions = NULL;

  446.     } else {

  447. invalid:

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

  449.     }

  450. 

  451. finish:

  452.     av_freep(&times);

  453.     av_freep(&filepositions);

  454.     avio_seek(ioc, initial_pos, SEEK_SET);

  455.     return ret;

  456. }

  457. 

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

  459.                             AVStream *vstream, const char *key,

  460.                             int64_t max_pos, int depth)

  461. {

  462.     AVCodecParameters *apar, *vpar;

  463.     FLVContext *flv = s->priv_data;

  464.     AVIOContext *ioc;

  465.     AMFDataType amf_type;

  466.     char str_val[1024];

  467.     double num_val;

  468. 

  469.     num_val  = 0;

  470.     ioc      = s->pb;

  471.     amf_type = avio_r8(ioc);

  472. 

  473.     switch (amf_type) {

  474.     case AMF_DATA_TYPE_NUMBER:

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

  476.         break;

  477.     case AMF_DATA_TYPE_BOOL:

  478.         num_val = avio_r8(ioc);

  479.         break;

  480.     case AMF_DATA_TYPE_STRING:

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

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

  483.             return -1;

  484.         }

  485.         break;

  486.     case AMF_DATA_TYPE_OBJECT:

  487.         if (key &&

  488.             (ioc->seekable & AVIO_SEEKABLE_NORMAL) &&

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

  490.             if (parse_keyframes_index(s, ioc,

  491.                                       max_pos) < 0)

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

  493.             else

  494.                 add_keyframes_index(s);

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

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

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

  498.                                  depth + 1) < 0)

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

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

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

  502.             return -1;

  503.         }

  504.         break;

  505.     case AMF_DATA_TYPE_NULL:

  506.     case AMF_DATA_TYPE_UNDEFINED:

  507.     case AMF_DATA_TYPE_UNSUPPORTED:

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

  509.     case AMF_DATA_TYPE_MIXEDARRAY:

  510.     {

  511.         unsigned v;

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

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

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

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

  516.             // parse to not skip over the object

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

  518.                                  depth + 1) < 0)

  519.                 return -1;

  520.         v = avio_r8(ioc);

  521.         if (v != AMF_END_OF_OBJECT) {

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

  523.             return -1;

  524.         }

  525.         break;

  526.     }

  527.     case AMF_DATA_TYPE_ARRAY:

  528.     {

  529.         unsigned int arraylen, i;

  530. 

  531.         arraylen = avio_rb32(ioc);

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

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

  534.                                  depth + 1) < 0)

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

  536.     }

  537.     break;

  538.     case AMF_DATA_TYPE_DATE:

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

  540.         break;

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

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

  543.         return -1;

  544.     }

  545. 

  546.     if (key) {

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

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

  549. 

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

  551.         if (depth == 1) {

  552.             if (amf_type == AMF_DATA_TYPE_NUMBER ||

  553.                 amf_type == AMF_DATA_TYPE_BOOL) {

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

  555.                     s->duration = num_val * AV_TIME_BASE;

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

  557.                          0 <= (int)(num_val * 1024.0))

  558.                     flv->video_bit_rate = num_val * 1024.0;

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

  560.                          0 <= (int)(num_val * 1024.0))

  561.                     flv->audio_bit_rate = num_val * 1024.0;

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

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

  564.                     if (!st)

  565.                         return AVERROR(ENOMEM);

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

  567.                 } else if (!strcmp(key, "framerate")) {

  568.                     flv->framerate = av_d2q(num_val, 1000);

  569.                     if (vstream)

  570.                         vstream->avg_frame_rate = flv->framerate;

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

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

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

  574.                         if (ret < 0)

  575.                             return ret;

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

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

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

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

  580.                         apar->sample_rate = num_val;

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

  582.                         apar->bits_per_coded_sample = num_val;

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

  584.                         apar->channels       = num_val + 1;

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

  586.                                                AV_CH_LAYOUT_STEREO :

  587.                                                AV_CH_LAYOUT_MONO;

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

  589.                         vpar->width = num_val;

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

  591.                         vpar->height = num_val;

  592.                     }

  593.                 }

  594.             }

  595.             if (amf_type == AMF_DATA_TYPE_STRING) {

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

  597.                     int version = -1;

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

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

  600.                             flv->broken_sizes = 1;

  601.                     }

  602.                 } else if (!strcmp(key, "metadatacreator")) {

  603.                     if (   !strcmp (str_val, "MEGA")

  604.                         || !strncmp(str_val, "FlixEngine", 10))

  605.                         flv->broken_sizes = 1;

  606.                 }

  607.             }

  608.         }

  609. 

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

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

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

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

  614. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  628.             return 0;

  629. 

  630.         s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;

  631.         if (amf_type == AMF_DATA_TYPE_BOOL) {

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

  633.                        sizeof(str_val));

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

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

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

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

  638.         } else if (amf_type == AMF_DATA_TYPE_STRING)

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

  640.     }

  641. 

  642.     return 0;

  643. }

  644. 

  645. #define TYPE_ONTEXTDATA 1

  646. #define TYPE_ONCAPTION 2

  647. #define TYPE_ONCAPTIONINFO 3

  648. #define TYPE_UNKNOWN 9

  649. 

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

  651. {

  652.     FLVContext *flv = s->priv_data;

  653.     AMFDataType type;

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

  655.     AVStream av_unused *dstream;

  656.     AVIOContext *ioc;

  657.     int i;

  658.     char buffer[32];

  659. 

  660.     astream = NULL;

  661.     vstream = NULL;

  662.     dstream = NULL;

  663.     ioc     = s->pb;

  664. 

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

  666.     type = avio_r8(ioc);

  667.     if (type != AMF_DATA_TYPE_STRING ||

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

  669.         return TYPE_UNKNOWN;

  670. 

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

  672.         return TYPE_ONTEXTDATA;

  673. 

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

  675.         return TYPE_ONCAPTION;

  676. 

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

  678.         return TYPE_ONCAPTIONINFO;

  679. 

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

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

  682.         return TYPE_UNKNOWN;

  683.     }

  684. 

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

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

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

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

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

  690.             vstream = stream;

  691.             flv->last_keyframe_stream_index = i;

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

  693.             astream = stream;

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

  695.                 flv->last_keyframe_stream_index = i;

  696.         }

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

  698.             dstream = stream;

  699.     }

  700. 

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

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

  703.         return -1;

  704. 

  705.     return 0;

  706. }

  707. 

  708. static int flv_read_header(AVFormatContext *s)

  709. {

  710.     int flags;

  711.     FLVContext *flv = s->priv_data;

  712.     int offset;

  713.     int pre_tag_size = 0;

  714. 

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

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

  717. 

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

  719. 

  720.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  721. 

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

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

  724. 

  725.     /* Annex E. The FLV File Format

  726.      * E.3 TheFLVFileBody

  727.      *     Field               Type    Comment

  728.      *     PreviousTagSize0    UI32    Always 0

  729.      * */

  730.     pre_tag_size = avio_rb32(s->pb);

  731.     if (pre_tag_size) {

  732.         av_log(s, AV_LOG_WARNING, "Read FLV header error, input file is not a standard flv format, first PreviousTagSize0 always is 0\n");

  733.     }

  734. 

  735.     s->start_time = 0;

  736.     flv->sum_flv_tag_size = 0;

  737.     flv->last_keyframe_stream_index = -1;

  738. 

  739.     return 0;

  740. }

  741. 

  742. static int flv_read_close(AVFormatContext *s)

  743. {

  744.     int i;

  745.     FLVContext *flv = s->priv_data;

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

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

  748.     av_freep(&flv->keyframe_times);

  749.     av_freep(&flv->keyframe_filepositions);

  750.     return 0;

  751. }

  752. 

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

  754. {

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

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

  757.         return AVERROR(ENOMEM);

  758.     st->internal->need_context_update = 1;

  759.     return 0;

  760. }

  761. 

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

  763.                                int size)

  764. {

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

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

  767.                                             AV_INPUT_BUFFER_PADDING_SIZE);

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

  769.         return AVERROR(ENOMEM);

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

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

  772.     return 0;

  773. }

  774. 

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

  776. {

  777.     int i, j, out;

  778.     av_log(s, AV_LOG_WARNING,

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

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

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

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

  783.         out = 0;

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

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

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

  787.         st->nb_index_entries = out;

  788.     }

  789. }

  790. 

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

  792. {

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

  794. 

  795.     switch (type) {

  796.     case AMF_DATA_TYPE_NUMBER:

  797.         avio_skip(pb, 8);

  798.         break;

  799.     case AMF_DATA_TYPE_BOOL:

  800.         avio_skip(pb, 1);

  801.         break;

  802.     case AMF_DATA_TYPE_STRING:

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

  804.         break;

  805.     case AMF_DATA_TYPE_ARRAY:

  806.         parse_name = 0;

  807.     case AMF_DATA_TYPE_MIXEDARRAY:

  808.         nb = avio_rb32(pb);

  809.     case AMF_DATA_TYPE_OBJECT:

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

  811.             if (parse_name) {

  812.                 int size = avio_rb16(pb);

  813.                 if (!size) {

  814.                     avio_skip(pb, 1);

  815.                     break;

  816.                 }

  817.                 avio_skip(pb, size);

  818.             }

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

  820.                 return ret;

  821.         }

  822.         break;

  823.     case AMF_DATA_TYPE_NULL:

  824.     case AMF_DATA_TYPE_OBJECT_END:

  825.         break;

  826.     default:

  827.         return AVERROR_INVALIDDATA;

  828.     }

  829.     return 0;

  830. }

  831. 

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

  833.                            int64_t dts, int64_t next)

  834. {

  835.     AVIOContext *pb = s->pb;

  836.     AVStream *st    = NULL;

  837.     char buf[20];

  838.     int ret = AVERROR_INVALIDDATA;

  839.     int i, length = -1;

  840.     int array = 0;

  841. 

  842.     switch (avio_r8(pb)) {

  843.     case AMF_DATA_TYPE_ARRAY:

  844.         array = 1;

  845.     case AMF_DATA_TYPE_MIXEDARRAY:

  846.         avio_seek(pb, 4, SEEK_CUR);

  847.     case AMF_DATA_TYPE_OBJECT:

  848.         break;

  849.     default:

  850.         goto skip;

  851.     }

  852. 

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

  854.         AMFDataType type = avio_r8(pb);

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

  856.             length = avio_rb16(pb);

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

  858.             if (ret < 0)

  859.                 goto skip;

  860.             else

  861.                 break;

  862.         } else {

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

  864.                 goto skip;

  865.         }

  866.     }

  867. 

  868.     if (length < 0) {

  869.         ret = AVERROR_INVALIDDATA;

  870.         goto skip;

  871.     }

  872. 

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

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

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

  876.             break;

  877.     }

  878. 

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

  880.         st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);

  881.         if (!st)

  882.             return AVERROR(ENOMEM);

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

  884.     }

  885. 

  886.     pkt->dts  = dts;

  887.     pkt->pts  = dts;

  888.     pkt->size = ret;

  889. 

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

  891.     pkt->flags       |= AV_PKT_FLAG_KEY;

  892. 

  893. skip:

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

  895. 

  896.     return ret;

  897. }

  898. 

  899. static int resync(AVFormatContext *s)

  900. {

  901.     FLVContext *flv = s->priv_data;

  902.     int64_t i;

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

  904. 

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

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

  907.         int j1 = j + RESYNC_BUFFER_SIZE;

  908.         flv->resync_buffer[j ] =

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

  910. 

  911.         if (i > 22) {

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

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

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

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

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

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

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

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

  920.                         return 1;

  921.                     }

  922.                 }

  923.             }

  924.         }

  925.     }

  926.     return AVERROR_EOF;

  927. }

  928. 

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

  930. {

  931.     FLVContext *flv = s->priv_data;

  932.     int ret, i, size, flags;

  933.     enum FlvTagType type;

  934.     int stream_type=-1;

  935.     int64_t next, pos, meta_pos;

  936.     int64_t dts, pts = AV_NOPTS_VALUE;

  937.     int av_uninit(channels);

  938.     int av_uninit(sample_rate);

  939.     AVStream *st    = NULL;

  940.     int last = -1;

  941.     int orig_size;

  942. 

  943. retry:

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

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

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

  947.         orig_size =

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

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

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

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

  952.         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));

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

  954.             return AVERROR_EOF;

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

  956.         flags = 0;

  957. 

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

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

  960.             if (pos == validate_pos) {

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

  962.                     VALIDATE_INDEX_TS_THRESH) {

  963.                     flv->validate_next++;

  964.                 } else {

  965.                     clear_index_entries(s, validate_pos);

  966.                     flv->validate_count = 0;

  967.                 }

  968.             } else if (pos > validate_pos) {

  969.                 clear_index_entries(s, validate_pos);

  970.                 flv->validate_count = 0;

  971.             }

  972.         }

  973. 

  974.         if (size == 0) {

  975.             ret = FFERROR_REDO;

  976.             goto leave;

  977.         }

  978. 

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

  980. 

  981.         if (type == FLV_TAG_TYPE_AUDIO) {

  982.             stream_type = FLV_STREAM_TYPE_AUDIO;

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

  984.             size--;

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

  986.             stream_type = FLV_STREAM_TYPE_VIDEO;

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

  988.             size--;

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

  990.                 goto skip;

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

  992.             stream_type=FLV_STREAM_TYPE_DATA;

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

  994.                 int type;

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

  996.                 type = flv_read_metabody(s, next);

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

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

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

  1000.                         flv->validate_index[0].pos - 4 < next

  1001.                     ) {

  1002.                         av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");

  1003.                         next = flv->validate_index[0].pos - 4;

  1004.                     }

  1005.                     goto skip;

  1006.                 } else if (type == TYPE_ONTEXTDATA) {

  1007.                     avpriv_request_sample(s, "OnTextData packet");

  1008.                     return flv_data_packet(s, pkt, dts, next);

  1009.                 } else if (type == TYPE_ONCAPTION) {

  1010.                     return flv_data_packet(s, pkt, dts, next);

  1011.                 }

  1012.                 avio_seek(s->pb, meta_pos, SEEK_SET);

  1013.             }

  1014.         } else {

  1015.             av_log(s, AV_LOG_DEBUG,

  1016.                    "Skipping flv packet: type %d, size %d, flags %d.\n",

  1017.                    type, size, flags);

  1018. skip:

  1019.             if (avio_seek(s->pb, next, SEEK_SET) != next) {

  1020.                  // This can happen if flv_read_metabody above read past

  1021.                  // next, on a non-seekable input, and the preceding data has

  1022.                  // been flushed out from the IO buffer.

  1023.                  av_log(s, AV_LOG_ERROR, "Unable to seek to the next packet\n");

  1024.                  return AVERROR_INVALIDDATA;

  1025.             }

  1026.             ret = FFERROR_REDO;

  1027.             goto leave;

  1028.         }

  1029. 

  1030.         /* skip empty data packets */

  1031.         if (!size) {

  1032.             ret = FFERROR_REDO;

  1033.             goto leave;

  1034.         }

  1035. 

  1036.         /* now find stream */

  1037.         for (i = 0; i < s->nb_streams; i++) {

  1038.             st = s->streams[i];

  1039.             if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1040.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&

  1041.                     (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))

  1042.                     break;

  1043.             } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1044.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&

  1045.                     (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))

  1046.                     break;

  1047.             } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1048.                 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)

  1049.                     break;

  1050.             }

  1051.         }

  1052.         if (i == s->nb_streams) {

  1053.             static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};

  1054.             st = create_stream(s, stream_types[stream_type]);

  1055.             if (!st)

  1056.                 return AVERROR(ENOMEM);

  1057. 

  1058.         }

  1059.         av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);

  1060. 

  1061.         if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&

  1062.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||

  1063.               stream_type == FLV_STREAM_TYPE_AUDIO))

  1064.             av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);

  1065. 

  1066.         if (  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))

  1067.             ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))

  1068.             || st->discard >= AVDISCARD_ALL

  1069.         ) {

  1070.             avio_seek(s->pb, next, SEEK_SET);

  1071.             ret = FFERROR_REDO;

  1072.             goto leave;

  1073.         }

  1074. 

  1075.     // if not streamed and no duration from metadata then seek to end to find

  1076.     // the duration from the timestamps

  1077.     if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&

  1078.         (!s->duration || s->duration == AV_NOPTS_VALUE) &&

  1079.         !flv->searched_for_end) {

  1080.         int size;

  1081.         const int64_t pos   = avio_tell(s->pb);

  1082.         // Read the last 4 bytes of the file, this should be the size of the

  1083.         // previous FLV tag. Use the timestamp of its payload as duration.

  1084.         int64_t fsize       = avio_size(s->pb);

  1085. retry_duration:

  1086.         avio_seek(s->pb, fsize - 4, SEEK_SET);

  1087.         size = avio_rb32(s->pb);

  1088.         if (size > 0 && size < fsize) {

  1089.             // Seek to the start of the last FLV tag at position (fsize - 4 - size)

  1090.             // but skip the byte indicating the type.

  1091.             avio_seek(s->pb, fsize - 3 - size, SEEK_SET);

  1092.             if (size == avio_rb24(s->pb) + 11) {

  1093.                 uint32_t ts = avio_rb24(s->pb);

  1094.                 ts         |= avio_r8(s->pb) << 24;

  1095.                 if (ts)

  1096.                     s->duration = ts * (int64_t)AV_TIME_BASE / 1000;

  1097.                 else if (fsize >= 8 && fsize - 8 >= size) {

  1098.                     fsize -= size+4;

  1099.                     goto retry_duration;

  1100.                 }

  1101.             }

  1102.         }

  1103. 

  1104.         avio_seek(s->pb, pos, SEEK_SET);

  1105.         flv->searched_for_end = 1;

  1106.     }

  1107. 

  1108.     if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1109.         int bits_per_coded_sample;

  1110.         channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;

  1111.         sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>

  1112.                                 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;

  1113.         bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

  1114.         if (!st->codecpar->channels || !st->codecpar->sample_rate ||

  1115.             !st->codecpar->bits_per_coded_sample) {

  1116.             st->codecpar->channels              = channels;

  1117.             st->codecpar->channel_layout        = channels == 1

  1118.                                                ? AV_CH_LAYOUT_MONO

  1119.                                                : AV_CH_LAYOUT_STEREO;

  1120.             st->codecpar->sample_rate           = sample_rate;

  1121.             st->codecpar->bits_per_coded_sample = bits_per_coded_sample;

  1122.         }

  1123.         if (!st->codecpar->codec_id) {

  1124.             flv_set_audio_codec(s, st, st->codecpar,

  1125.                                 flags & FLV_AUDIO_CODECID_MASK);

  1126.             flv->last_sample_rate =

  1127.             sample_rate           = st->codecpar->sample_rate;

  1128.             flv->last_channels    =

  1129.             channels              = st->codecpar->channels;

  1130.         } else {

  1131.             AVCodecParameters *par = avcodec_parameters_alloc();

  1132.             if (!par) {

  1133.                 ret = AVERROR(ENOMEM);

  1134.                 goto leave;

  1135.             }

  1136.             par->sample_rate = sample_rate;

  1137.             par->bits_per_coded_sample = bits_per_coded_sample;

  1138.             flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);

  1139.             sample_rate = par->sample_rate;

  1140.             avcodec_parameters_free(&par);

  1141.         }

  1142.     } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1143.         int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);

  1144.         if (ret < 0)

  1145.             return ret;

  1146.         size -= ret;

  1147.     } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1148.         st->codecpar->codec_id = AV_CODEC_ID_TEXT;

  1149.     }

  1150. 

  1151.     if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1152.         st->codecpar->codec_id == AV_CODEC_ID_H264 ||

  1153.         st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1154.         int type = avio_r8(s->pb);

  1155.         size--;

  1156. 

  1157.         if (size < 0) {

  1158.             ret = AVERROR_INVALIDDATA;

  1159.             goto leave;

  1160.         }

  1161. 

  1162.         if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1163.             // sign extension

  1164.             int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;

  1165.             pts = dts + cts;

  1166.             if (cts < 0) { // dts might be wrong

  1167.                 if (!flv->wrong_dts)

  1168.                     av_log(s, AV_LOG_WARNING,

  1169.                         "Negative cts, previous timestamps might be wrong.\n");

  1170.                 flv->wrong_dts = 1;

  1171.             } else if (FFABS(dts - pts) > 1000*60*15) {

  1172.                 av_log(s, AV_LOG_WARNING,

  1173.                        "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);

  1174.                 dts = pts = AV_NOPTS_VALUE;

  1175.             }

  1176.         }

  1177.         if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1178.             st->codecpar->codec_id == AV_CODEC_ID_H264)) {

  1179.             AVDictionaryEntry *t;

  1180. 

  1181.             if (st->codecpar->extradata) {

  1182.                 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)

  1183.                     return ret;

  1184.                 ret = FFERROR_REDO;

  1185.                 goto leave;

  1186.             }

  1187.             if ((ret = flv_get_extradata(s, st, size)) < 0)

  1188.                 return ret;

  1189. 

  1190.             /* Workaround for buggy Omnia A/XE encoder */

  1191.             t = av_dict_get(s->metadata, "Encoder", NULL, 0);

  1192.             if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))

  1193.                 st->codecpar->extradata_size = 2;

  1194. 

  1195.             if (st->codecpar->codec_id == AV_CODEC_ID_AAC && 0) {

  1196.                 MPEG4AudioConfig cfg;

  1197. 

  1198.                 if (avpriv_mpeg4audio_get_config(&cfg, st->codecpar->extradata,

  1199.                                                  st->codecpar->extradata_size * 8, 1) >= 0) {

  1200.                 st->codecpar->channels       = cfg.channels;

  1201.                 st->codecpar->channel_layout = 0;

  1202.                 if (cfg.ext_sample_rate)

  1203.                     st->codecpar->sample_rate = cfg.ext_sample_rate;

  1204.                 else

  1205.                     st->codecpar->sample_rate = cfg.sample_rate;

  1206.                 av_log(s, AV_LOG_TRACE, "mp4a config channels %d sample rate %d\n",

  1207.                         st->codecpar->channels, st->codecpar->sample_rate);

  1208.                 }

  1209.             }

  1210. 

  1211.             ret = FFERROR_REDO;

  1212.             goto leave;

  1213.         }

  1214.     }

  1215. 

  1216.     /* skip empty data packets */

  1217.     if (!size) {

  1218.         ret = FFERROR_REDO;

  1219.         goto leave;

  1220.     }

  1221. 

  1222.     ret = av_get_packet(s->pb, pkt, size);

  1223.     if (ret < 0)

  1224.         return ret;

  1225.     pkt->dts          = dts;

  1226.     pkt->pts          = pts == AV_NOPTS_VALUE ? dts : pts;

  1227.     pkt->stream_index = st->index;

  1228.     pkt->pos          = pos;

  1229.     if (flv->new_extradata[stream_type]) {

  1230.         uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,

  1231.                                                 flv->new_extradata_size[stream_type]);

  1232.         if (side) {

  1233.             memcpy(side, flv->new_extradata[stream_type],

  1234.                    flv->new_extradata_size[stream_type]);

  1235.             av_freep(&flv->new_extradata[stream_type]);

  1236.             flv->new_extradata_size[stream_type] = 0;

  1237.         }

  1238.     }

  1239.     if (stream_type == FLV_STREAM_TYPE_AUDIO &&

  1240.                     (sample_rate != flv->last_sample_rate ||

  1241.                      channels    != flv->last_channels)) {

  1242.         flv->last_sample_rate = sample_rate;

  1243.         flv->last_channels    = channels;

  1244.         ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);

  1245.     }

  1246. 

  1247.     if (    stream_type == FLV_STREAM_TYPE_AUDIO ||

  1248.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||

  1249.             stream_type == FLV_STREAM_TYPE_DATA)

  1250.         pkt->flags |= AV_PKT_FLAG_KEY;

  1251. 

  1252. leave:

  1253.     last = avio_rb32(s->pb);

  1254.     if (!flv->trust_datasize) {

  1255.         if (last != orig_size + 11 && last != orig_size + 10 &&

  1256.             !avio_feof(s->pb) &&

  1257.             (last != orig_size || !last) && last != flv->sum_flv_tag_size &&

  1258.             !flv->broken_sizes) {

  1259.             av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);

  1260.             avio_seek(s->pb, pos + 1, SEEK_SET);

  1261.             ret = resync(s);

  1262.             av_packet_unref(pkt);

  1263.             if (ret >= 0) {

  1264.                 goto retry;

  1265.             }

  1266.         }

  1267.     }

  1268.     return ret;

  1269. }

  1270. 

  1271. static int flv_read_seek(AVFormatContext *s, int stream_index,

  1272.                          int64_t ts, int flags)

  1273. {

  1274.     FLVContext *flv = s->priv_data;

  1275.     flv->validate_count = 0;

  1276.     return avio_seek_time(s->pb, stream_index, ts, flags);

  1277. }

  1278. 

  1279. #define OFFSET(x) offsetof(FLVContext, x)

  1280. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1281. static const AVOption options[] = {

  1282.     { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

  1283.     { "flv_ignore_prevtag", "Ignore the Size of previous tag", OFFSET(trust_datasize), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

  1284.     { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },

  1285.     { NULL }

  1286. };

  1287. 

  1288. static const AVClass flv_class = {

  1289.     .class_name = "flvdec",

  1290.     .item_name  = av_default_item_name,

  1291.     .option     = options,

  1292.     .version    = LIBAVUTIL_VERSION_INT,

  1293. };

  1294. 

  1295. AVInputFormat ff_flv_demuxer = {

  1296.     .name           = "flv",

  1297.     .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),

  1298.     .priv_data_size = sizeof(FLVContext),

  1299.     .read_probe     = flv_probe,

  1300.     .read_header    = flv_read_header,

  1301.     .read_packet    = flv_read_packet,

  1302.     .read_seek      = flv_read_seek,

  1303.     .read_close     = flv_read_close,

  1304.     .extensions     = "flv",

  1305.     .priv_class     = &flv_class,

  1306. };

  1307. 

  1308. static const AVClass live_flv_class = {

  1309.     .class_name = "live_flvdec",

  1310.     .item_name  = av_default_item_name,

  1311.     .option     = options,

  1312.     .version    = LIBAVUTIL_VERSION_INT,

  1313. };

  1314. 

  1315. AVInputFormat ff_live_flv_demuxer = {

  1316.     .name           = "live_flv",

  1317.     .long_name      = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),

  1318.     .priv_data_size = sizeof(FLVContext),

  1319.     .read_probe     = live_flv_probe,

  1320.     .read_header    = flv_read_header,

  1321.     .read_packet    = flv_read_packet,

  1322.     .read_seek      = flv_read_seek,

  1323.     .read_close     = flv_read_close,

  1324.     .extensions     = "flv",

  1325.     .priv_class     = &live_flv_class,

  1326.     .flags          = AVFMT_TS_DISCONT

  1327. };