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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 "libavutil/time_internal.h"

  34. #include "libavcodec/bytestream.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 dump_full_metadata;   ///< Dump full metadata of the onMetadata

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

  50.     uint8_t *new_extradata[FLV_STREAM_TYPE_NB];

  51.     int new_extradata_size[FLV_STREAM_TYPE_NB];

  52.     int last_sample_rate;

  53.     int last_channels;

  54.     struct {

  55.         int64_t dts;

  56.         int64_t pos;

  57.     } validate_index[2];

  58.     int validate_next;

  59.     int validate_count;

  60.     int searched_for_end;

  61. 

  62.     uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];

  63. 

  64.     int broken_sizes;

  65.     int sum_flv_tag_size;

  66. 

  67.     int last_keyframe_stream_index;

  68.     int keyframe_count;

  69.     int64_t video_bit_rate;

  70.     int64_t audio_bit_rate;

  71.     int64_t *keyframe_times;

  72.     int64_t *keyframe_filepositions;

  73.     int missing_streams;

  74.     AVRational framerate;

  75.     int64_t last_ts;

  76.     int64_t time_offset;

  77.     int64_t time_pos;

  78. } FLVContext;

  79. 

  80. /* AMF date type */

  81. typedef struct amf_date {

  82.     double   milliseconds;

  83.     int16_t  timezone;

  84. } amf_date;

  85. 

  86. static int probe(const AVProbeData *p, int live)

  87. {

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

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

  90. 

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

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

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

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

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

  96.         offset > 8) {

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

  98. 

  99.         if (live == is_live)

  100.             return AVPROBE_SCORE_MAX;

  101.     }

  102.     return 0;

  103. }

  104. 

  105. static int flv_probe(const AVProbeData *p)

  106. {

  107.     return probe(p, 0);

  108. }

  109. 

  110. static int live_flv_probe(const AVProbeData *p)

  111. {

  112.     return probe(p, 1);

  113. }

  114. 

  115. static int kux_probe(const AVProbeData *p)

  116. {

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

  118. 

  119.     if (d[0] == 'K' &&

  120.         d[1] == 'D' &&

  121.         d[2] == 'K' &&

  122.         d[3] == 0 &&

  123.         d[4] == 0) {

  124.         return AVPROBE_SCORE_EXTENSION + 1;

  125.     }

  126.     return 0;

  127. }

  128. 

  129. static void add_keyframes_index(AVFormatContext *s)

  130. {

  131.     FLVContext *flv   = s->priv_data;

  132.     AVStream *stream  = NULL;

  133.     unsigned int i    = 0;

  134. 

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

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

  137.         return;

  138.     }

  139. 

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

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

  142. 

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

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

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

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

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

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

  149.         }

  150.     } else

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

  152. 

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

  154.         av_freep(&flv->keyframe_times);

  155.         av_freep(&flv->keyframe_filepositions);

  156.         flv->keyframe_count = 0;

  157.     }

  158. }

  159. 

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

  161. {

  162.     FLVContext *flv   = s->priv_data;

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

  164.     if (!st)

  165.         return NULL;

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

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

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

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

  170.                            && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_DATA

  171.                            && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_DATA))

  172.         s->ctx_flags &= ~AVFMTCTX_NOHEADER;

  173.     if (codec_type == AVMEDIA_TYPE_AUDIO) {

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

  175.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;

  176.     }

  177.     if (codec_type == AVMEDIA_TYPE_VIDEO) {

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

  179.         flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;

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

  181.     }

  182. 

  183. 

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

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

  186.     add_keyframes_index(s);

  187.     return st;

  188. }

  189. 

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

  191. {

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

  193.     int flv_codecid           = flags & FLV_AUDIO_CODECID_MASK;

  194.     int codec_id;

  195. 

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

  197.         return 1;

  198. 

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

  200.         return 0;

  201. 

  202.     switch (flv_codecid) {

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

  204.     case FLV_CODECID_PCM:

  205.         codec_id = bits_per_coded_sample == 8

  206.                    ? AV_CODEC_ID_PCM_U8

  207. #if HAVE_BIGENDIAN

  208.                    : AV_CODEC_ID_PCM_S16BE;

  209. #else

  210.                    : AV_CODEC_ID_PCM_S16LE;

  211. #endif

  212.         return codec_id == apar->codec_id;

  213.     case FLV_CODECID_PCM_LE:

  214.         codec_id = bits_per_coded_sample == 8

  215.                    ? AV_CODEC_ID_PCM_U8

  216.                    : AV_CODEC_ID_PCM_S16LE;

  217.         return codec_id == apar->codec_id;

  218.     case FLV_CODECID_AAC:

  219.         return apar->codec_id == AV_CODEC_ID_AAC;

  220.     case FLV_CODECID_ADPCM:

  221.         return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;

  222.     case FLV_CODECID_SPEEX:

  223.         return apar->codec_id == AV_CODEC_ID_SPEEX;

  224.     case FLV_CODECID_MP3:

  225.         return apar->codec_id == AV_CODEC_ID_MP3;

  226.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

  227.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  228.     case FLV_CODECID_NELLYMOSER:

  229.         return apar->codec_id == AV_CODEC_ID_NELLYMOSER;

  230.     case FLV_CODECID_PCM_MULAW:

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

  232.                apar->codec_id    == AV_CODEC_ID_PCM_MULAW;

  233.     case FLV_CODECID_PCM_ALAW:

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

  235.                apar->codec_id    == AV_CODEC_ID_PCM_ALAW;

  236.     default:

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

  238.     }

  239. }

  240. 

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

  242.                                 AVCodecParameters *apar, int flv_codecid)

  243. {

  244.     switch (flv_codecid) {

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

  246.     case FLV_CODECID_PCM:

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

  248.                            ? AV_CODEC_ID_PCM_U8

  249. #if HAVE_BIGENDIAN

  250.                            : AV_CODEC_ID_PCM_S16BE;

  251. #else

  252.                            : AV_CODEC_ID_PCM_S16LE;

  253. #endif

  254.         break;

  255.     case FLV_CODECID_PCM_LE:

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

  257.                            ? AV_CODEC_ID_PCM_U8

  258.                            : AV_CODEC_ID_PCM_S16LE;

  259.         break;

  260.     case FLV_CODECID_AAC:

  261.         apar->codec_id = AV_CODEC_ID_AAC;

  262.         break;

  263.     case FLV_CODECID_ADPCM:

  264.         apar->codec_id = AV_CODEC_ID_ADPCM_SWF;

  265.         break;

  266.     case FLV_CODECID_SPEEX:

  267.         apar->codec_id    = AV_CODEC_ID_SPEEX;

  268.         apar->sample_rate = 16000;

  269.         break;

  270.     case FLV_CODECID_MP3:

  271.         apar->codec_id      = AV_CODEC_ID_MP3;

  272.         astream->need_parsing = AVSTREAM_PARSE_FULL;

  273.         break;

  274.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

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

  276.         apar->sample_rate = 8000;

  277.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  278.         break;

  279.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  280.         apar->sample_rate = 16000;

  281.         apar->codec_id    = AV_CODEC_ID_NELLYMOSER;

  282.         break;

  283.     case FLV_CODECID_NELLYMOSER:

  284.         apar->codec_id = AV_CODEC_ID_NELLYMOSER;

  285.         break;

  286.     case FLV_CODECID_PCM_MULAW:

  287.         apar->sample_rate = 8000;

  288.         apar->codec_id    = AV_CODEC_ID_PCM_MULAW;

  289.         break;

  290.     case FLV_CODECID_PCM_ALAW:

  291.         apar->sample_rate = 8000;

  292.         apar->codec_id    = AV_CODEC_ID_PCM_ALAW;

  293.         break;

  294.     default:

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

  296.                flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

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

  298.     }

  299. }

  300. 

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

  302. {

  303.     int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;

  304. 

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

  306.         return 1;

  307. 

  308.     switch (flv_codecid) {

  309.     case FLV_CODECID_H263:

  310.         return vpar->codec_id == AV_CODEC_ID_FLV1;

  311.     case FLV_CODECID_SCREEN:

  312.         return vpar->codec_id == AV_CODEC_ID_FLASHSV;

  313.     case FLV_CODECID_SCREEN2:

  314.         return vpar->codec_id == AV_CODEC_ID_FLASHSV2;

  315.     case FLV_CODECID_VP6:

  316.         return vpar->codec_id == AV_CODEC_ID_VP6F;

  317.     case FLV_CODECID_VP6A:

  318.         return vpar->codec_id == AV_CODEC_ID_VP6A;

  319.     case FLV_CODECID_H264:

  320.         return vpar->codec_id == AV_CODEC_ID_H264;

  321.     default:

  322.         return vpar->codec_tag == flv_codecid;

  323.     }

  324. }

  325. 

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

  327.                                int flv_codecid, int read)

  328. {

  329.     int ret = 0;

  330.     AVCodecParameters *par = vstream->codecpar;

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

  332.     switch (flv_codecid) {

  333.     case FLV_CODECID_H263:

  334.         par->codec_id = AV_CODEC_ID_FLV1;

  335.         break;

  336.     case FLV_CODECID_REALH263:

  337.         par->codec_id = AV_CODEC_ID_H263;

  338.         break; // Really mean it this time

  339.     case FLV_CODECID_SCREEN:

  340.         par->codec_id = AV_CODEC_ID_FLASHSV;

  341.         break;

  342.     case FLV_CODECID_SCREEN2:

  343.         par->codec_id = AV_CODEC_ID_FLASHSV2;

  344.         break;

  345.     case FLV_CODECID_VP6:

  346.         par->codec_id = AV_CODEC_ID_VP6F;

  347.     case FLV_CODECID_VP6A:

  348.         if (flv_codecid == FLV_CODECID_VP6A)

  349.             par->codec_id = AV_CODEC_ID_VP6A;

  350.         if (read) {

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

  352.                 ff_alloc_extradata(par, 1);

  353.             }

  354.             if (par->extradata)

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

  356.             else

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

  358.         }

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

  360.         break;

  361.     case FLV_CODECID_H264:

  362.         par->codec_id = AV_CODEC_ID_H264;

  363.         vstream->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  365.         break;

  366.     case FLV_CODECID_MPEG4:

  367.         par->codec_id = AV_CODEC_ID_MPEG4;

  368.         ret = 3;

  369.         break;

  370.     default:

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

  372.         par->codec_tag = flv_codecid;

  373.     }

  374. 

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

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

  377.         return AVERROR_PATCHWELCOME;

  378.     }

  379. 

  380.     return ret;

  381. }

  382. 

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

  384. {

  385.     int length = avio_rb16(ioc);

  386.     if (length >= buffsize) {

  387.         avio_skip(ioc, length);

  388.         return -1;

  389.     }

  390. 

  391.     avio_read(ioc, buffer, length);

  392. 

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

  394. 

  395.     return length;

  396. }

  397. 

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

  399. {

  400.     FLVContext *flv       = s->priv_data;

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

  402.     char str_val[256];

  403.     int64_t *times         = NULL;

  404.     int64_t *filepositions = NULL;

  405.     int ret                = AVERROR(ENOSYS);

  406.     int64_t initial_pos    = avio_tell(ioc);

  407. 

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

  409.         av_log(s, AV_LOG_DEBUG, "keyframes have been parsed\n");

  410.         return 0;

  411.     }

  412.     av_assert0(!flv->keyframe_times);

  413.     av_assert0(!flv->keyframe_filepositions);

  414. 

  415.     if (s->flags & AVFMT_FLAG_IGNIDX)

  416.         return 0;

  417. 

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

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

  420.         int64_t **current_array;

  421.         unsigned int arraylen;

  422. 

  423.         // Expect array object in context

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

  425.             break;

  426. 

  427.         arraylen = avio_rb32(ioc);

  428.         if (arraylen>>28)

  429.             break;

  430. 

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

  432.             current_array = &times;

  433.             timeslen      = arraylen;

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

  435.                    !filepositions) {

  436.             current_array = &filepositions;

  437.             fileposlen    = arraylen;

  438.         } else

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

  440.             // metadata for indexing

  441.             break;

  442. 

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

  444.             ret = AVERROR(ENOMEM);

  445.             goto finish;

  446.         }

  447. 

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

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

  450.                 goto invalid;

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

  452.         }

  453.         if (times && filepositions) {

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

  455.             // to finish parsing the object

  456.             ret = 0;

  457.             break;

  458.         }

  459.     }

  460. 

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

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

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

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

  465.             flv->validate_count        = i + 1;

  466.         }

  467.         flv->keyframe_times = times;

  468.         flv->keyframe_filepositions = filepositions;

  469.         flv->keyframe_count = timeslen;

  470.         times = NULL;

  471.         filepositions = NULL;

  472.     } else {

  473. invalid:

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

  475.     }

  476. 

  477. finish:

  478.     av_freep(&times);

  479.     av_freep(&filepositions);

  480.     avio_seek(ioc, initial_pos, SEEK_SET);

  481.     return ret;

  482. }

  483. 

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

  485.                             AVStream *vstream, const char *key,

  486.                             int64_t max_pos, int depth)

  487. {

  488.     AVCodecParameters *apar, *vpar;

  489.     FLVContext *flv = s->priv_data;

  490.     AVIOContext *ioc;

  491.     AMFDataType amf_type;

  492.     char str_val[1024];

  493.     double num_val;

  494.     amf_date date;

  495. 

  496.     num_val  = 0;

  497.     ioc      = s->pb;

  498.     amf_type = avio_r8(ioc);

  499. 

  500.     switch (amf_type) {

  501.     case AMF_DATA_TYPE_NUMBER:

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

  503.         break;

  504.     case AMF_DATA_TYPE_BOOL:

  505.         num_val = avio_r8(ioc);

  506.         break;

  507.     case AMF_DATA_TYPE_STRING:

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

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

  510.             return -1;

  511.         }

  512.         break;

  513.     case AMF_DATA_TYPE_OBJECT:

  514.         if (key &&

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

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

  517.             if (parse_keyframes_index(s, ioc,

  518.                                       max_pos) < 0)

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

  520.             else

  521.                 add_keyframes_index(s);

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

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

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

  525.                                  depth + 1) < 0)

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

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

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

  529.             return -1;

  530.         }

  531.         break;

  532.     case AMF_DATA_TYPE_NULL:

  533.     case AMF_DATA_TYPE_UNDEFINED:

  534.     case AMF_DATA_TYPE_UNSUPPORTED:

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

  536.     case AMF_DATA_TYPE_MIXEDARRAY:

  537.     {

  538.         unsigned v;

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

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

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

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

  543.             // parse to not skip over the object

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

  545.                                  depth + 1) < 0)

  546.                 return -1;

  547.         v = avio_r8(ioc);

  548.         if (v != AMF_END_OF_OBJECT) {

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

  550.             return -1;

  551.         }

  552.         break;

  553.     }

  554.     case AMF_DATA_TYPE_ARRAY:

  555.     {

  556.         unsigned int arraylen, i;

  557. 

  558.         arraylen = avio_rb32(ioc);

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

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

  561.                                  depth + 1) < 0)

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

  563.     }

  564.     break;

  565.     case AMF_DATA_TYPE_DATE:

  566.         // timestamp (double) and UTC offset (int16)

  567.         date.milliseconds = av_int2double(avio_rb64(ioc));

  568.         date.timezone = avio_rb16(ioc);

  569.         break;

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

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

  572.         return -1;

  573.     }

  574. 

  575.     if (key) {

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

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

  578. 

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

  580.         if (depth == 1) {

  581.             if (amf_type == AMF_DATA_TYPE_NUMBER ||

  582.                 amf_type == AMF_DATA_TYPE_BOOL) {

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

  584.                     s->duration = num_val * AV_TIME_BASE;

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

  586.                          0 <= (int)(num_val * 1024.0))

  587.                     flv->video_bit_rate = num_val * 1024.0;

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

  589.                          0 <= (int)(num_val * 1024.0))

  590.                     flv->audio_bit_rate = num_val * 1024.0;

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

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

  593.                     if (!st)

  594.                         return AVERROR(ENOMEM);

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

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

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

  598.                     if (vstream)

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

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

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

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

  603.                         if (ret < 0)

  604.                             return ret;

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

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

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

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

  609.                         apar->sample_rate = num_val;

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

  611.                         apar->bits_per_coded_sample = num_val;

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

  613.                         apar->channels       = num_val + 1;

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

  615.                                                AV_CH_LAYOUT_STEREO :

  616.                                                AV_CH_LAYOUT_MONO;

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

  618.                         vpar->width = num_val;

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

  620.                         vpar->height = num_val;

  621.                     }

  622.                 }

  623.             }

  624.             if (amf_type == AMF_DATA_TYPE_STRING) {

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

  626.                     int version = -1;

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

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

  629.                             flv->broken_sizes = 1;

  630.                     }

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

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

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

  634.                         flv->broken_sizes = 1;

  635.                 }

  636.             }

  637.         }

  638. 

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

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

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

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

  643. 

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

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

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

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

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

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

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

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

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

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

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

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

  656.             !strcmp(key, "datastream")) && !flv->dump_full_metadata)

  657.             return 0;

  658. 

  659.         s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;

  660.         if (amf_type == AMF_DATA_TYPE_BOOL) {

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

  662.                        sizeof(str_val));

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

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

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

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

  667.         } else if (amf_type == AMF_DATA_TYPE_STRING) {

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

  669.         } else if (amf_type == AMF_DATA_TYPE_DATE) {

  670.             time_t time;

  671.             struct tm t;

  672.             char datestr[128];

  673.             time =  date.milliseconds / 1000; // to seconds

  674.             localtime_r(&time, &t);

  675.             strftime(datestr, sizeof(datestr), "%a, %d %b %Y %H:%M:%S %z", &t);

  676. 

  677.             av_dict_set(&s->metadata, key, datestr, 0);

  678.         }

  679.     }

  680. 

  681.     return 0;

  682. }

  683. 

  684. #define TYPE_ONTEXTDATA 1

  685. #define TYPE_ONCAPTION 2

  686. #define TYPE_ONCAPTIONINFO 3

  687. #define TYPE_UNKNOWN 9

  688. 

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

  690. {

  691.     FLVContext *flv = s->priv_data;

  692.     AMFDataType type;

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

  694.     AVStream av_unused *dstream;

  695.     AVIOContext *ioc;

  696.     int i;

  697.     char buffer[32];

  698. 

  699.     astream = NULL;

  700.     vstream = NULL;

  701.     dstream = NULL;

  702.     ioc     = s->pb;

  703. 

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

  705.     type = avio_r8(ioc);

  706.     if (type != AMF_DATA_TYPE_STRING ||

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

  708.         return TYPE_UNKNOWN;

  709. 

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

  711.         return TYPE_ONTEXTDATA;

  712. 

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

  714.         return TYPE_ONCAPTION;

  715. 

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

  717.         return TYPE_ONCAPTIONINFO;

  718. 

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

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

  721.         return TYPE_UNKNOWN;

  722.     }

  723. 

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

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

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

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

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

  729.             vstream = stream;

  730.             flv->last_keyframe_stream_index = i;

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

  732.             astream = stream;

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

  734.                 flv->last_keyframe_stream_index = i;

  735.         }

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

  737.             dstream = stream;

  738.     }

  739. 

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

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

  742.         return -1;

  743. 

  744.     return 0;

  745. }

  746. 

  747. static int flv_read_header(AVFormatContext *s)

  748. {

  749.     int flags;

  750.     FLVContext *flv = s->priv_data;

  751.     int offset;

  752.     int pre_tag_size = 0;

  753. 

  754.     /* Actual FLV data at 0xe40000 in KUX file */

  755.     if(!strcmp(s->iformat->name, "kux"))

  756.         avio_skip(s->pb, 0xe40000);

  757. 

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

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

  760. 

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

  762. 

  763.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  764. 

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

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

  767. 

  768.     /* Annex E. The FLV File Format

  769.      * E.3 TheFLVFileBody

  770.      *     Field               Type    Comment

  771.      *     PreviousTagSize0    UI32    Always 0

  772.      * */

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

  774.     if (pre_tag_size) {

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

  776.     }

  777. 

  778.     s->start_time = 0;

  779.     flv->sum_flv_tag_size = 0;

  780.     flv->last_keyframe_stream_index = -1;

  781. 

  782.     return 0;

  783. }

  784. 

  785. static int flv_read_close(AVFormatContext *s)

  786. {

  787.     int i;

  788.     FLVContext *flv = s->priv_data;

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

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

  791.     av_freep(&flv->keyframe_times);

  792.     av_freep(&flv->keyframe_filepositions);

  793.     return 0;

  794. }

  795. 

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

  797. {

  798.     if (!size)

  799.         return 0;

  800. 

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

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

  803.         return AVERROR(ENOMEM);

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

  805.     return 0;

  806. }

  807. 

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

  809.                                int size)

  810. {

  811.     if (!size)

  812.         return 0;

  813. 

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

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

  816.                                             AV_INPUT_BUFFER_PADDING_SIZE);

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

  818.         return AVERROR(ENOMEM);

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

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

  821.     return 0;

  822. }

  823. 

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

  825. {

  826.     int i, j, out;

  827.     av_log(s, AV_LOG_WARNING,

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

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

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

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

  832.         out = 0;

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

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

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

  836.         st->nb_index_entries = out;

  837.     }

  838. }

  839. 

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

  841. {

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

  843. 

  844.     switch (type) {

  845.     case AMF_DATA_TYPE_NUMBER:

  846.         avio_skip(pb, 8);

  847.         break;

  848.     case AMF_DATA_TYPE_BOOL:

  849.         avio_skip(pb, 1);

  850.         break;

  851.     case AMF_DATA_TYPE_STRING:

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

  853.         break;

  854.     case AMF_DATA_TYPE_ARRAY:

  855.         parse_name = 0;

  856.     case AMF_DATA_TYPE_MIXEDARRAY:

  857.         nb = avio_rb32(pb);

  858.     case AMF_DATA_TYPE_OBJECT:

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

  860.             if (parse_name) {

  861.                 int size = avio_rb16(pb);

  862.                 if (!size) {

  863.                     avio_skip(pb, 1);

  864.                     break;

  865.                 }

  866.                 avio_skip(pb, size);

  867.             }

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

  869.                 return ret;

  870.         }

  871.         break;

  872.     case AMF_DATA_TYPE_NULL:

  873.     case AMF_DATA_TYPE_OBJECT_END:

  874.         break;

  875.     default:

  876.         return AVERROR_INVALIDDATA;

  877.     }

  878.     return 0;

  879. }

  880. 

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

  882.                            int64_t dts, int64_t next)

  883. {

  884.     AVIOContext *pb = s->pb;

  885.     AVStream *st    = NULL;

  886.     char buf[20];

  887.     int ret = AVERROR_INVALIDDATA;

  888.     int i, length = -1;

  889.     int array = 0;

  890. 

  891.     switch (avio_r8(pb)) {

  892.     case AMF_DATA_TYPE_ARRAY:

  893.         array = 1;

  894.     case AMF_DATA_TYPE_MIXEDARRAY:

  895.         avio_seek(pb, 4, SEEK_CUR);

  896.     case AMF_DATA_TYPE_OBJECT:

  897.         break;

  898.     default:

  899.         goto skip;

  900.     }

  901. 

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

  903.         AMFDataType type = avio_r8(pb);

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

  905.             length = avio_rb16(pb);

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

  907.             if (ret < 0)

  908.                 goto skip;

  909.             else

  910.                 break;

  911.         } else {

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

  913.                 goto skip;

  914.         }

  915.     }

  916. 

  917.     if (length < 0) {

  918.         ret = AVERROR_INVALIDDATA;

  919.         goto skip;

  920.     }

  921. 

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

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

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

  925.             break;

  926.     }

  927. 

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

  929.         st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);

  930.         if (!st)

  931.             return AVERROR(ENOMEM);

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

  933.     }

  934. 

  935.     pkt->dts  = dts;

  936.     pkt->pts  = dts;

  937.     pkt->size = ret;

  938. 

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

  940.     pkt->flags       |= AV_PKT_FLAG_KEY;

  941. 

  942. skip:

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

  944. 

  945.     return ret;

  946. }

  947. 

  948. static int resync(AVFormatContext *s)

  949. {

  950.     FLVContext *flv = s->priv_data;

  951.     int64_t i;

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

  953. 

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

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

  956.         int j1 = j + RESYNC_BUFFER_SIZE;

  957.         flv->resync_buffer[j ] =

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

  959. 

  960.         if (i >= 8 && pos) {

  961.             uint8_t *d = flv->resync_buffer + j1 - 8;

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

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

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

  965.                 d[3] < 5 && d[5] == 0) {

  966.                 av_log(s, AV_LOG_WARNING, "Concatenated FLV detected, might fail to demux, decode and seek %"PRId64"\n", flv->last_ts);

  967.                 flv->time_offset = flv->last_ts + 1;

  968.                 flv->time_pos    = avio_tell(s->pb);

  969.             }

  970.         }

  971. 

  972.         if (i > 22) {

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

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

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

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

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

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

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

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

  981.                         return 1;

  982.                     }

  983.                 }

  984.             }

  985.         }

  986.     }

  987.     return AVERROR_EOF;

  988. }

  989. 

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

  991. {

  992.     FLVContext *flv = s->priv_data;

  993.     int ret, i, size, flags;

  994.     enum FlvTagType type;

  995.     int stream_type=-1;

  996.     int64_t next, pos, meta_pos;

  997.     int64_t dts, pts = AV_NOPTS_VALUE;

  998.     int av_uninit(channels);

  999.     int av_uninit(sample_rate);

  1000.     AVStream *st    = NULL;

  1001.     int last = -1;

  1002.     int orig_size;

  1003. 

  1004. retry:

  1005.     /* pkt size is repeated at end. skip it */

  1006.     pos  = avio_tell(s->pb);

  1007.     type = (avio_r8(s->pb) & 0x1F);

  1008.     orig_size =

  1009.     size = avio_rb24(s->pb);

  1010.     flv->sum_flv_tag_size += size + 11;

  1011.     dts  = avio_rb24(s->pb);

  1012.     dts |= (unsigned)avio_r8(s->pb) << 24;

  1013.     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));

  1014.     if (avio_feof(s->pb))

  1015.         return AVERROR_EOF;

  1016.     avio_skip(s->pb, 3); /* stream id, always 0 */

  1017.     flags = 0;

  1018. 

  1019.     if (flv->validate_next < flv->validate_count) {

  1020.         int64_t validate_pos = flv->validate_index[flv->validate_next].pos;

  1021.         if (pos == validate_pos) {

  1022.             if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=

  1023.                 VALIDATE_INDEX_TS_THRESH) {

  1024.                 flv->validate_next++;

  1025.             } else {

  1026.                 clear_index_entries(s, validate_pos);

  1027.                 flv->validate_count = 0;

  1028.             }

  1029.         } else if (pos > validate_pos) {

  1030.             clear_index_entries(s, validate_pos);

  1031.             flv->validate_count = 0;

  1032.         }

  1033.     }

  1034. 

  1035.     if (size == 0) {

  1036.         ret = FFERROR_REDO;

  1037.         goto leave;

  1038.     }

  1039. 

  1040.     next = size + avio_tell(s->pb);

  1041. 

  1042.     if (type == FLV_TAG_TYPE_AUDIO) {

  1043.         stream_type = FLV_STREAM_TYPE_AUDIO;

  1044.         flags    = avio_r8(s->pb);

  1045.         size--;

  1046.     } else if (type == FLV_TAG_TYPE_VIDEO) {

  1047.         stream_type = FLV_STREAM_TYPE_VIDEO;

  1048.         flags    = avio_r8(s->pb);

  1049.         size--;

  1050.         if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)

  1051.             goto skip;

  1052.     } else if (type == FLV_TAG_TYPE_META) {

  1053.         stream_type=FLV_STREAM_TYPE_SUBTITLE;

  1054.         if (size > 13 + 1 + 4) { // Header-type metadata stuff

  1055.             int type;

  1056.             meta_pos = avio_tell(s->pb);

  1057.             type = flv_read_metabody(s, next);

  1058.             if (type == 0 && dts == 0 || type < 0) {

  1059.                 if (type < 0 && flv->validate_count &&

  1060.                     flv->validate_index[0].pos     > next &&

  1061.                     flv->validate_index[0].pos - 4 < next

  1062.                 ) {

  1063.                     av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");

  1064.                     next = flv->validate_index[0].pos - 4;

  1065.                 }

  1066.                 goto skip;

  1067.             } else if (type == TYPE_ONTEXTDATA) {

  1068.                 avpriv_request_sample(s, "OnTextData packet");

  1069.                 return flv_data_packet(s, pkt, dts, next);

  1070.             } else if (type == TYPE_ONCAPTION) {

  1071.                 return flv_data_packet(s, pkt, dts, next);

  1072.             } else if (type == TYPE_UNKNOWN) {

  1073.                 stream_type = FLV_STREAM_TYPE_DATA;

  1074.             }

  1075.             avio_seek(s->pb, meta_pos, SEEK_SET);

  1076.         }

  1077.     } else {

  1078.         av_log(s, AV_LOG_DEBUG,

  1079.                "Skipping flv packet: type %d, size %d, flags %d.\n",

  1080.                type, size, flags);

  1081. skip:

  1082.         if (avio_seek(s->pb, next, SEEK_SET) != next) {

  1083.             // This can happen if flv_read_metabody above read past

  1084.             // next, on a non-seekable input, and the preceding data has

  1085.             // been flushed out from the IO buffer.

  1086.             av_log(s, AV_LOG_ERROR, "Unable to seek to the next packet\n");

  1087.             return AVERROR_INVALIDDATA;

  1088.         }

  1089.         ret = FFERROR_REDO;

  1090.         goto leave;

  1091.     }

  1092. 

  1093.     /* skip empty data packets */

  1094.     if (!size) {

  1095.         ret = FFERROR_REDO;

  1096.         goto leave;

  1097.     }

  1098. 

  1099.     /* now find stream */

  1100.     for (i = 0; i < s->nb_streams; i++) {

  1101.         st = s->streams[i];

  1102.         if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1103.             if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&

  1104.                 (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))

  1105.                 break;

  1106.         } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1107.             if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&

  1108.                 (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))

  1109.                 break;

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

  1111.             if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)

  1112.                 break;

  1113.         } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1114.             if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA)

  1115.                 break;

  1116.         }

  1117.     }

  1118.     if (i == s->nb_streams) {

  1119.         static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE, AVMEDIA_TYPE_DATA};

  1120.         st = create_stream(s, stream_types[stream_type]);

  1121.         if (!st)

  1122.             return AVERROR(ENOMEM);

  1123. 

  1124.     }

  1125.     av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);

  1126. 

  1127.     if (flv->time_pos <= pos) {

  1128.         dts += flv->time_offset;

  1129.     }

  1130. 

  1131.     if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&

  1132.         ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||

  1133.          stream_type == FLV_STREAM_TYPE_AUDIO))

  1134.         av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);

  1135. 

  1136.     if (  (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))

  1137.           ||(st->discard >= AVDISCARD_BIDIR  &&  ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))

  1138.           || st->discard >= AVDISCARD_ALL

  1139.     ) {

  1140.         avio_seek(s->pb, next, SEEK_SET);

  1141.         ret = FFERROR_REDO;

  1142.         goto leave;

  1143.     }

  1144. 

  1145.     // if not streamed and no duration from metadata then seek to end to find

  1146.     // the duration from the timestamps

  1147.     if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&

  1148.         (!s->duration || s->duration == AV_NOPTS_VALUE) &&

  1149.         !flv->searched_for_end) {

  1150.         int size;

  1151.         const int64_t pos   = avio_tell(s->pb);

  1152.         // Read the last 4 bytes of the file, this should be the size of the

  1153.         // previous FLV tag. Use the timestamp of its payload as duration.

  1154.         int64_t fsize       = avio_size(s->pb);

  1155. retry_duration:

  1156.         avio_seek(s->pb, fsize - 4, SEEK_SET);

  1157.         size = avio_rb32(s->pb);

  1158.         if (size > 0 && size < fsize) {

  1159.             // Seek to the start of the last FLV tag at position (fsize - 4 - size)

  1160.             // but skip the byte indicating the type.

  1161.             avio_seek(s->pb, fsize - 3 - size, SEEK_SET);

  1162.             if (size == avio_rb24(s->pb) + 11) {

  1163.                 uint32_t ts = avio_rb24(s->pb);

  1164.                 ts         |= avio_r8(s->pb) << 24;

  1165.                 if (ts)

  1166.                     s->duration = ts * (int64_t)AV_TIME_BASE / 1000;

  1167.                 else if (fsize >= 8 && fsize - 8 >= size) {

  1168.                     fsize -= size+4;

  1169.                     goto retry_duration;

  1170.                 }

  1171.             }

  1172.         }

  1173. 

  1174.         avio_seek(s->pb, pos, SEEK_SET);

  1175.         flv->searched_for_end = 1;

  1176.     }

  1177. 

  1178.     if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  1179.         int bits_per_coded_sample;

  1180.         channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;

  1181.         sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>

  1182.                                 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;

  1183.         bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

  1184.         if (!st->codecpar->channels || !st->codecpar->sample_rate ||

  1185.             !st->codecpar->bits_per_coded_sample) {

  1186.             st->codecpar->channels              = channels;

  1187.             st->codecpar->channel_layout        = channels == 1

  1188.                                                ? AV_CH_LAYOUT_MONO

  1189.                                                : AV_CH_LAYOUT_STEREO;

  1190.             st->codecpar->sample_rate           = sample_rate;

  1191.             st->codecpar->bits_per_coded_sample = bits_per_coded_sample;

  1192.         }

  1193.         if (!st->codecpar->codec_id) {

  1194.             flv_set_audio_codec(s, st, st->codecpar,

  1195.                                 flags & FLV_AUDIO_CODECID_MASK);

  1196.             flv->last_sample_rate =

  1197.             sample_rate           = st->codecpar->sample_rate;

  1198.             flv->last_channels    =

  1199.             channels              = st->codecpar->channels;

  1200.         } else {

  1201.             AVCodecParameters *par = avcodec_parameters_alloc();

  1202.             if (!par) {

  1203.                 ret = AVERROR(ENOMEM);

  1204.                 goto leave;

  1205.             }

  1206.             par->sample_rate = sample_rate;

  1207.             par->bits_per_coded_sample = bits_per_coded_sample;

  1208.             flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);

  1209.             sample_rate = par->sample_rate;

  1210.             avcodec_parameters_free(&par);

  1211.         }

  1212.     } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {

  1213.         int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);

  1214.         if (ret < 0)

  1215.             return ret;

  1216.         size -= ret;

  1217.     } else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {

  1218.         st->codecpar->codec_id = AV_CODEC_ID_TEXT;

  1219.     } else if (stream_type == FLV_STREAM_TYPE_DATA) {

  1220.         st->codecpar->codec_id = AV_CODEC_ID_NONE; // Opaque AMF data

  1221.     }

  1222. 

  1223.     if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1224.         st->codecpar->codec_id == AV_CODEC_ID_H264 ||

  1225.         st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1226.         int type = avio_r8(s->pb);

  1227.         size--;

  1228. 

  1229.         if (size < 0) {

  1230.             ret = AVERROR_INVALIDDATA;

  1231.             goto leave;

  1232.         }

  1233. 

  1234.         if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {

  1235.             // sign extension

  1236.             int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;

  1237.             pts = dts + cts;

  1238.             if (cts < 0) { // dts might be wrong

  1239.                 if (!flv->wrong_dts)

  1240.                     av_log(s, AV_LOG_WARNING,

  1241.                         "Negative cts, previous timestamps might be wrong.\n");

  1242.                 flv->wrong_dts = 1;

  1243.             } else if (FFABS(dts - pts) > 1000*60*15) {

  1244.                 av_log(s, AV_LOG_WARNING,

  1245.                        "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);

  1246.                 dts = pts = AV_NOPTS_VALUE;

  1247.             }

  1248.         }

  1249.         if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||

  1250.             st->codecpar->codec_id == AV_CODEC_ID_H264)) {

  1251.             AVDictionaryEntry *t;

  1252. 

  1253.             if (st->codecpar->extradata) {

  1254.                 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)

  1255.                     return ret;

  1256.                 ret = FFERROR_REDO;

  1257.                 goto leave;

  1258.             }

  1259.             if ((ret = flv_get_extradata(s, st, size)) < 0)

  1260.                 return ret;

  1261. 

  1262.             /* Workaround for buggy Omnia A/XE encoder */

  1263.             t = av_dict_get(s->metadata, "Encoder", NULL, 0);

  1264.             if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))

  1265.                 st->codecpar->extradata_size = 2;

  1266. 

  1267.             ret = FFERROR_REDO;

  1268.             goto leave;

  1269.         }

  1270.     }

  1271. 

  1272.     /* skip empty data packets */

  1273.     if (!size) {

  1274.         ret = FFERROR_REDO;

  1275.         goto leave;

  1276.     }

  1277. 

  1278.     ret = av_get_packet(s->pb, pkt, size);

  1279.     if (ret < 0)

  1280.         return ret;

  1281.     pkt->dts          = dts;

  1282.     pkt->pts          = pts == AV_NOPTS_VALUE ? dts : pts;

  1283.     pkt->stream_index = st->index;

  1284.     pkt->pos          = pos;

  1285.     if (flv->new_extradata[stream_type]) {

  1286.         uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,

  1287.                                                 flv->new_extradata_size[stream_type]);

  1288.         if (side) {

  1289.             memcpy(side, flv->new_extradata[stream_type],

  1290.                    flv->new_extradata_size[stream_type]);

  1291.             av_freep(&flv->new_extradata[stream_type]);

  1292.             flv->new_extradata_size[stream_type] = 0;

  1293.         }

  1294.     }

  1295.     if (stream_type == FLV_STREAM_TYPE_AUDIO &&

  1296.                     (sample_rate != flv->last_sample_rate ||

  1297.                      channels    != flv->last_channels)) {

  1298.         flv->last_sample_rate = sample_rate;

  1299.         flv->last_channels    = channels;

  1300.         ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);

  1301.     }

  1302. 

  1303.     if (    stream_type == FLV_STREAM_TYPE_AUDIO ||

  1304.             ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||

  1305.             stream_type == FLV_STREAM_TYPE_SUBTITLE ||

  1306.             stream_type == FLV_STREAM_TYPE_DATA)

  1307.         pkt->flags |= AV_PKT_FLAG_KEY;

  1308. 

  1309. leave:

  1310.     last = avio_rb32(s->pb);

  1311.     if (!flv->trust_datasize) {

  1312.         if (last != orig_size + 11 && last != orig_size + 10 &&

  1313.             !avio_feof(s->pb) &&

  1314.             (last != orig_size || !last) && last != flv->sum_flv_tag_size &&

  1315.             !flv->broken_sizes) {

  1316.             av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);

  1317.             avio_seek(s->pb, pos + 1, SEEK_SET);

  1318.             ret = resync(s);

  1319.             av_packet_unref(pkt);

  1320.             if (ret >= 0) {

  1321.                 goto retry;

  1322.             }

  1323.         }

  1324.     }

  1325. 

  1326.     if (ret >= 0)

  1327.         flv->last_ts = pkt->dts;

  1328. 

  1329.     return ret;

  1330. }

  1331. 

  1332. static int flv_read_seek(AVFormatContext *s, int stream_index,

  1333.                          int64_t ts, int flags)

  1334. {

  1335.     FLVContext *flv = s->priv_data;

  1336.     flv->validate_count = 0;

  1337.     return avio_seek_time(s->pb, stream_index, ts, flags);

  1338. }

  1339. 

  1340. #define OFFSET(x) offsetof(FLVContext, x)

  1341. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1342. static const AVOption options[] = {

  1343.     { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

  1344.     { "flv_full_metadata", "Dump full metadata of the onMetadata", OFFSET(dump_full_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

  1345.     { "flv_ignore_prevtag", "Ignore the Size of previous tag", OFFSET(trust_datasize), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

  1346.     { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },

  1347.     { NULL }

  1348. };

  1349. 

  1350. static const AVClass flv_class = {

  1351.     .class_name = "flvdec",

  1352.     .item_name  = av_default_item_name,

  1353.     .option     = options,

  1354.     .version    = LIBAVUTIL_VERSION_INT,

  1355. };

  1356. 

  1357. AVInputFormat ff_flv_demuxer = {

  1358.     .name           = "flv",

  1359.     .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),

  1360.     .priv_data_size = sizeof(FLVContext),

  1361.     .read_probe     = flv_probe,

  1362.     .read_header    = flv_read_header,

  1363.     .read_packet    = flv_read_packet,

  1364.     .read_seek      = flv_read_seek,

  1365.     .read_close     = flv_read_close,

  1366.     .extensions     = "flv",

  1367.     .priv_class     = &flv_class,

  1368. };

  1369. 

  1370. static const AVClass live_flv_class = {

  1371.     .class_name = "live_flvdec",

  1372.     .item_name  = av_default_item_name,

  1373.     .option     = options,

  1374.     .version    = LIBAVUTIL_VERSION_INT,

  1375. };

  1376. 

  1377. AVInputFormat ff_live_flv_demuxer = {

  1378.     .name           = "live_flv",

  1379.     .long_name      = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),

  1380.     .priv_data_size = sizeof(FLVContext),

  1381.     .read_probe     = live_flv_probe,

  1382.     .read_header    = flv_read_header,

  1383.     .read_packet    = flv_read_packet,

  1384.     .read_seek      = flv_read_seek,

  1385.     .read_close     = flv_read_close,

  1386.     .extensions     = "flv",

  1387.     .priv_class     = &live_flv_class,

  1388.     .flags          = AVFMT_TS_DISCONT

  1389. };

  1390. 

  1391. static const AVClass kux_class = {

  1392.     .class_name = "kuxdec",

  1393.     .item_name  = av_default_item_name,

  1394.     .option     = options,

  1395.     .version    = LIBAVUTIL_VERSION_INT,

  1396. };

  1397. 

  1398. AVInputFormat ff_kux_demuxer = {

  1399.     .name           = "kux",

  1400.     .long_name      = NULL_IF_CONFIG_SMALL("KUX (YouKu)"),

  1401.     .priv_data_size = sizeof(FLVContext),

  1402.     .read_probe     = kux_probe,

  1403.     .read_header    = flv_read_header,

  1404.     .read_packet    = flv_read_packet,

  1405.     .read_seek      = flv_read_seek,

  1406.     .read_close     = flv_read_close,

  1407.     .extensions     = "kux",

  1408.     .priv_class     = &kux_class,

  1409. };