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FFmpeg/libavformat/flvdec.c

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  1. /*

  2.  * FLV demuxer

  3.  * Copyright (c) 2003 The FFmpeg Project

  4.  *

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

  6.  * It is composed of:

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

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

  9.  *

  10.  * This file is part of FFmpeg.

  11.  *

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

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

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

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

  16.  *

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

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

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

  20.  * Lesser General Public License for more details.

  21.  *

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

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

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

  25.  */

  26. 

  27. #include "libavutil/avstring.h"

  28. #include "libavutil/channel_layout.h"

  29. #include "libavutil/dict.h"

  30. #include "libavutil/opt.h"

  31. #include "libavutil/intfloat.h"

  32. #include "libavutil/mathematics.h"

  33. #include "libavcodec/bytestream.h"

  34. #include "libavcodec/mpeg4audio.h"

  35. #include "avformat.h"

  36. #include "internal.h"

  37. #include "avio_internal.h"

  38. #include "flv.h"

  39. 

  40. #define VALIDATE_INDEX_TS_THRESH 2500

  41. 

  42. typedef struct {

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

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

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

  46.     uint8_t *new_extradata[FLV_STREAM_TYPE_NB];

  47.     int new_extradata_size[FLV_STREAM_TYPE_NB];

  48.     int last_sample_rate;

  49.     int last_channels;

  50.     struct {

  51.         int64_t dts;

  52.         int64_t pos;

  53.     } validate_index[2];

  54.     int validate_next;

  55.     int validate_count;

  56.     int searched_for_end;

  57. } FLVContext;

  58. 

  59. static int flv_probe(AVProbeData *p)

  60. {

  61.     const uint8_t *d;

  62. 

  63.     d = p->buf;

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

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

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

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

  68.         AV_RB32(d + 5) > 8) {

  69.         return AVPROBE_SCORE_MAX;

  70.     }

  71.     return 0;

  72. }

  73. 

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

  75. {

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

  77.     if (!st)

  78.         return NULL;

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

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

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

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

  83.         s->ctx_flags &= ~AVFMTCTX_NOHEADER;

  84. 

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

  86.     return st;

  87. }

  88. 

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

  90. {

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

  92.     int flv_codecid           = flags & FLV_AUDIO_CODECID_MASK;

  93.     int codec_id;

  94. 

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

  96.         return 1;

  97. 

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

  99.         return 0;

  100. 

  101.     switch (flv_codecid) {

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

  103.     case FLV_CODECID_PCM:

  104.         codec_id = bits_per_coded_sample == 8

  105.                    ? AV_CODEC_ID_PCM_U8

  106. #if HAVE_BIGENDIAN

  107.                    : AV_CODEC_ID_PCM_S16BE;

  108. #else

  109.                    : AV_CODEC_ID_PCM_S16LE;

  110. #endif

  111.         return codec_id == acodec->codec_id;

  112.     case FLV_CODECID_PCM_LE:

  113.         codec_id = bits_per_coded_sample == 8

  114.                    ? AV_CODEC_ID_PCM_U8

  115.                    : AV_CODEC_ID_PCM_S16LE;

  116.         return codec_id == acodec->codec_id;

  117.     case FLV_CODECID_AAC:

  118.         return acodec->codec_id == AV_CODEC_ID_AAC;

  119.     case FLV_CODECID_ADPCM:

  120.         return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF;

  121.     case FLV_CODECID_SPEEX:

  122.         return acodec->codec_id == AV_CODEC_ID_SPEEX;

  123.     case FLV_CODECID_MP3:

  124.         return acodec->codec_id == AV_CODEC_ID_MP3;

  125.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

  126.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  127.     case FLV_CODECID_NELLYMOSER:

  128.         return acodec->codec_id == AV_CODEC_ID_NELLYMOSER;

  129.     case FLV_CODECID_PCM_MULAW:

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

  131.                acodec->codec_id    == AV_CODEC_ID_PCM_MULAW;

  132.     case FLV_CODECID_PCM_ALAW:

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

  134.                acodec->codec_id    == AV_CODEC_ID_PCM_ALAW;

  135.     default:

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

  137.     }

  138. }

  139. 

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

  141.                                 AVCodecContext *acodec, int flv_codecid)

  142. {

  143.     switch (flv_codecid) {

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

  145.     case FLV_CODECID_PCM:

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

  147.                            ? AV_CODEC_ID_PCM_U8

  148. #if HAVE_BIGENDIAN

  149.                            : AV_CODEC_ID_PCM_S16BE;

  150. #else

  151.                            : AV_CODEC_ID_PCM_S16LE;

  152. #endif

  153.         break;

  154.     case FLV_CODECID_PCM_LE:

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

  156.                            ? AV_CODEC_ID_PCM_U8

  157.                            : AV_CODEC_ID_PCM_S16LE;

  158.         break;

  159.     case FLV_CODECID_AAC:

  160.         acodec->codec_id = AV_CODEC_ID_AAC;

  161.         break;

  162.     case FLV_CODECID_ADPCM:

  163.         acodec->codec_id = AV_CODEC_ID_ADPCM_SWF;

  164.         break;

  165.     case FLV_CODECID_SPEEX:

  166.         acodec->codec_id    = AV_CODEC_ID_SPEEX;

  167.         acodec->sample_rate = 16000;

  168.         break;

  169.     case FLV_CODECID_MP3:

  170.         acodec->codec_id      = AV_CODEC_ID_MP3;

  171.         astream->need_parsing = AVSTREAM_PARSE_FULL;

  172.         break;

  173.     case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

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

  175.         acodec->sample_rate = 8000;

  176.         acodec->codec_id    = AV_CODEC_ID_NELLYMOSER;

  177.         break;

  178.     case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

  179.         acodec->sample_rate = 16000;

  180.         acodec->codec_id    = AV_CODEC_ID_NELLYMOSER;

  181.         break;

  182.     case FLV_CODECID_NELLYMOSER:

  183.         acodec->codec_id = AV_CODEC_ID_NELLYMOSER;

  184.         break;

  185.     case FLV_CODECID_PCM_MULAW:

  186.         acodec->sample_rate = 8000;

  187.         acodec->codec_id    = AV_CODEC_ID_PCM_MULAW;

  188.         break;

  189.     case FLV_CODECID_PCM_ALAW:

  190.         acodec->sample_rate = 8000;

  191.         acodec->codec_id    = AV_CODEC_ID_PCM_ALAW;

  192.         break;

  193.     default:

  194.         av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n",

  195.                flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

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

  197.     }

  198. }

  199. 

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

  201. {

  202.     int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;

  203. 

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

  205.         return 1;

  206. 

  207.     switch (flv_codecid) {

  208.     case FLV_CODECID_H263:

  209.         return vcodec->codec_id == AV_CODEC_ID_FLV1;

  210.     case FLV_CODECID_SCREEN:

  211.         return vcodec->codec_id == AV_CODEC_ID_FLASHSV;

  212.     case FLV_CODECID_SCREEN2:

  213.         return vcodec->codec_id == AV_CODEC_ID_FLASHSV2;

  214.     case FLV_CODECID_VP6:

  215.         return vcodec->codec_id == AV_CODEC_ID_VP6F;

  216.     case FLV_CODECID_VP6A:

  217.         return vcodec->codec_id == AV_CODEC_ID_VP6A;

  218.     case FLV_CODECID_H264:

  219.         return vcodec->codec_id == AV_CODEC_ID_H264;

  220.     default:

  221.         return vcodec->codec_tag == flv_codecid;

  222.     }

  223. }

  224. 

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

  226.                                int flv_codecid, int read)

  227. {

  228.     AVCodecContext *vcodec = vstream->codec;

  229.     switch (flv_codecid) {

  230.     case FLV_CODECID_H263:

  231.         vcodec->codec_id = AV_CODEC_ID_FLV1;

  232.         break;

  233.     case FLV_CODECID_REALH263:

  234.         vcodec->codec_id = AV_CODEC_ID_H263;

  235.         break; // Really mean it this time

  236.     case FLV_CODECID_SCREEN:

  237.         vcodec->codec_id = AV_CODEC_ID_FLASHSV;

  238.         break;

  239.     case FLV_CODECID_SCREEN2:

  240.         vcodec->codec_id = AV_CODEC_ID_FLASHSV2;

  241.         break;

  242.     case FLV_CODECID_VP6:

  243.         vcodec->codec_id = AV_CODEC_ID_VP6F;

  244.     case FLV_CODECID_VP6A:

  245.         if (flv_codecid == FLV_CODECID_VP6A)

  246.             vcodec->codec_id = AV_CODEC_ID_VP6A;

  247.         if (read) {

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

  249.                 vcodec->extradata = av_malloc(1 + FF_INPUT_BUFFER_PADDING_SIZE);

  250.                 if (vcodec->extradata)

  251.                     vcodec->extradata_size = 1;

  252.             }

  253.             if (vcodec->extradata)

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

  255.             else

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

  257.         }

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

  259.     case FLV_CODECID_H264:

  260.         vcodec->codec_id = AV_CODEC_ID_H264;

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

  262.     case FLV_CODECID_MPEG4:

  263.         vcodec->codec_id = AV_CODEC_ID_MPEG4;

  264.         return 3;

  265.     default:

  266.         av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);

  267.         vcodec->codec_tag = flv_codecid;

  268.     }

  269. 

  270.     return 0;

  271. }

  272. 

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

  274. {

  275.     int length = avio_rb16(ioc);

  276.     if (length >= buffsize) {

  277.         avio_skip(ioc, length);

  278.         return -1;

  279.     }

  280. 

  281.     avio_read(ioc, buffer, length);

  282. 

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

  284. 

  285.     return length;

  286. }

  287. 

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

  289.                                  AVStream *vstream, int64_t max_pos)

  290. {

  291.     FLVContext *flv       = s->priv_data;

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

  293.     char str_val[256];

  294.     int64_t *times         = NULL;

  295.     int64_t *filepositions = NULL;

  296.     int ret                = AVERROR(ENOSYS);

  297.     int64_t initial_pos    = avio_tell(ioc);

  298. 

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

  300.         av_log(s, AV_LOG_WARNING, "Skiping duplicate index\n");

  301.         return 0;

  302.     }

  303. 

  304.     if (s->flags & AVFMT_FLAG_IGNIDX)

  305.         return 0;

  306. 

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

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

  309.         int64_t **current_array;

  310.         unsigned int arraylen;

  311. 

  312.         // Expect array object in context

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

  314.             break;

  315. 

  316.         arraylen = avio_rb32(ioc);

  317.         if (arraylen>>28)

  318.             break;

  319. 

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

  321.             current_array = &times;

  322.             timeslen      = arraylen;

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

  324.                    !filepositions) {

  325.             current_array = &filepositions;

  326.             fileposlen    = arraylen;

  327.         } else

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

  329.             // metadata for indexing

  330.             break;

  331. 

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

  333.             ret = AVERROR(ENOMEM);

  334.             goto finish;

  335.         }

  336. 

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

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

  339.                 goto invalid;

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

  341.         }

  342.         if (times && filepositions) {

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

  344.             // to finish parsing the object

  345.             ret = 0;

  346.             break;

  347.         }

  348.     }

  349. 

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

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

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

  353.                                0, 0, AVINDEX_KEYFRAME);

  354.             if (i < 2) {

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

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

  357.                 flv->validate_count        = i + 1;

  358.             }

  359.         }

  360.     } else {

  361. invalid:

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

  363.     }

  364. 

  365. finish:

  366.     av_freep(&times);

  367.     av_freep(&filepositions);

  368.     avio_seek(ioc, initial_pos, SEEK_SET);

  369.     return ret;

  370. }

  371. 

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

  373.                             AVStream *vstream, const char *key,

  374.                             int64_t max_pos, int depth)

  375. {

  376.     AVCodecContext *acodec, *vcodec;

  377.     FLVContext *flv = s->priv_data;

  378.     AVIOContext *ioc;

  379.     AMFDataType amf_type;

  380.     char str_val[256];

  381.     double num_val;

  382. 

  383.     num_val  = 0;

  384.     ioc      = s->pb;

  385.     amf_type = avio_r8(ioc);

  386. 

  387.     switch (amf_type) {

  388.     case AMF_DATA_TYPE_NUMBER:

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

  390.         break;

  391.     case AMF_DATA_TYPE_BOOL:

  392.         num_val = avio_r8(ioc);

  393.         break;

  394.     case AMF_DATA_TYPE_STRING:

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

  396.             return -1;

  397.         break;

  398.     case AMF_DATA_TYPE_OBJECT:

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

  400.             ioc->seekable &&

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

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

  403.                                       max_pos) < 0)

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

  405. 

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

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

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

  409.                                  depth + 1) < 0)

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

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

  412.             return -1;

  413.         break;

  414.     case AMF_DATA_TYPE_NULL:

  415.     case AMF_DATA_TYPE_UNDEFINED:

  416.     case AMF_DATA_TYPE_UNSUPPORTED:

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

  418.     case AMF_DATA_TYPE_MIXEDARRAY:

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

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

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

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

  423.             // parse to not skip over the object

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

  425.                                  depth + 1) < 0)

  426.                 return -1;

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

  428.             return -1;

  429.         break;

  430.     case AMF_DATA_TYPE_ARRAY:

  431.     {

  432.         unsigned int arraylen, i;

  433. 

  434.         arraylen = avio_rb32(ioc);

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

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

  437.                                  depth + 1) < 0)

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

  439.     }

  440.     break;

  441.     case AMF_DATA_TYPE_DATE:

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

  443.         break;

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

  445.         return -1;

  446.     }

  447. 

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

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

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

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

  452. 

  453.         if (amf_type == AMF_DATA_TYPE_NUMBER ||

  454.             amf_type == AMF_DATA_TYPE_BOOL) {

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

  456.                 s->duration = num_val * AV_TIME_BASE;

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

  458.                      0 <= (int)(num_val * 1024.0))

  459.                 vcodec->bit_rate = num_val * 1024.0;

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

  461.                      0 <= (int)(num_val * 1024.0))

  462.                 acodec->bit_rate = num_val * 1024.0;

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

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

  465.                 if (!st)

  466.                     return AVERROR(ENOMEM);

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

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

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

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

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

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

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

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

  475.                     acodec->sample_rate = num_val;

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

  477.                     acodec->bits_per_coded_sample = num_val;

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

  479.                     acodec->channels       = num_val + 1;

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

  481.                                              AV_CH_LAYOUT_STEREO :

  482.                                              AV_CH_LAYOUT_MONO;

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

  484.                     vcodec->width = num_val;

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

  486.                     vcodec->height = num_val;

  487.                 }

  488.             }

  489.         }

  490. 

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

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

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

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

  495. 

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

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

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

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

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

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

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

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

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

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

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

  507.             !strcmp(key, "audiocodecid"))

  508.             return 0;

  509. 

  510.         if (amf_type == AMF_DATA_TYPE_BOOL) {

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

  512.                        sizeof(str_val));

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

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

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

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

  517.         } else if (amf_type == AMF_DATA_TYPE_STRING)

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

  519.     }

  520. 

  521.     return 0;

  522. }

  523. 

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

  525. {

  526.     AMFDataType type;

  527.     AVStream *stream, *astream, *vstream, *dstream;

  528.     AVIOContext *ioc;

  529.     int i;

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

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

  532.     char buffer[11];

  533. 

  534.     astream = NULL;

  535.     vstream = NULL;

  536.     dstream = NULL;

  537.     ioc     = s->pb;

  538. 

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

  540.     type = avio_r8(ioc);

  541.     if (type != AMF_DATA_TYPE_STRING ||

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

  543.         return -1;

  544. 

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

  546.         return 1;

  547. 

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

  549.         return -1;

  550. 

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

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

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

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

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

  556.             vstream = stream;

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

  558.             astream = stream;

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

  560.             dstream = stream;

  561.     }

  562. 

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

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

  565.         return -1;

  566. 

  567.     return 0;

  568. }

  569. 

  570. static int flv_read_header(AVFormatContext *s)

  571. {

  572.     int offset, flags;

  573. 

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

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

  576.     /* old flvtool cleared this field */

  577.     /* FIXME: better fix needed */

  578.     if (!flags) {

  579.         flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;

  580.         av_log(s, AV_LOG_WARNING,

  581.                "Broken FLV file, which says no streams present, "

  582.                "this might fail\n");

  583.     }

  584. 

  585.     s->ctx_flags |= AVFMTCTX_NOHEADER;

  586. 

  587.     if (flags & FLV_HEADER_FLAG_HASVIDEO)

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

  589.             return AVERROR(ENOMEM);

  590.     if (flags & FLV_HEADER_FLAG_HASAUDIO)

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

  592.             return AVERROR(ENOMEM);

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

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

  595. 

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

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

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

  599. 

  600.     s->start_time = 0;

  601. 

  602.     return 0;

  603. }

  604. 

  605. static int flv_read_close(AVFormatContext *s)

  606. {

  607.     int i;

  608.     FLVContext *flv = s->priv_data;

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

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

  611.     return 0;

  612. }

  613. 

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

  615. {

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

  617.     st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);

  618.     if (!st->codec->extradata)

  619.         return AVERROR(ENOMEM);

  620.     st->codec->extradata_size = size;

  621.     avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);

  622.     return 0;

  623. }

  624. 

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

  626.                                int size)

  627. {

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

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

  630.                                             FF_INPUT_BUFFER_PADDING_SIZE);

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

  632.         return AVERROR(ENOMEM);

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

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

  635.     return 0;

  636. }

  637. 

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

  639. {

  640.     int i, j, out;

  641.     av_log(s, AV_LOG_WARNING,

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

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

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

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

  646.         out = 0;

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

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

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

  650.         st->nb_index_entries = out;

  651.     }

  652. }

  653. 

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

  655.                            int64_t dts, int64_t next)

  656. {

  657.     int ret         = AVERROR_INVALIDDATA, i;

  658.     AVIOContext *pb = s->pb;

  659.     AVStream *st    = NULL;

  660.     AMFDataType type;

  661.     char buf[20];

  662.     int length;

  663. 

  664.     type = avio_r8(pb);

  665.     if (type == AMF_DATA_TYPE_MIXEDARRAY)

  666.         avio_seek(pb, 4, SEEK_CUR);

  667.     else if (type != AMF_DATA_TYPE_OBJECT)

  668.         goto out;

  669. 

  670.     amf_get_string(pb, buf, sizeof(buf));

  671.     if (strcmp(buf, "type") || avio_r8(pb) != AMF_DATA_TYPE_STRING)

  672.         goto out;

  673. 

  674.     amf_get_string(pb, buf, sizeof(buf));

  675.     // FIXME parse it as codec_id

  676.     amf_get_string(pb, buf, sizeof(buf));

  677.     if (strcmp(buf, "text") || avio_r8(pb) != AMF_DATA_TYPE_STRING)

  678.         goto out;

  679. 

  680.     length = avio_rb16(pb);

  681.     ret    = av_get_packet(s->pb, pkt, length);

  682.     if (ret < 0) {

  683.         ret = AVERROR(EIO);

  684.         goto out;

  685.     }

  686. 

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

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

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

  690.             break;

  691.     }

  692. 

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

  694.         st = create_stream(s, AVMEDIA_TYPE_DATA);

  695.         if (!st)

  696.             goto out;

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

  698.     }

  699. 

  700.     pkt->dts  = dts;

  701.     pkt->pts  = dts;

  702.     pkt->size = ret;

  703. 

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

  705.     pkt->flags       |= AV_PKT_FLAG_KEY;

  706. 

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

  708. 

  709. out:

  710.     return ret;

  711. }

  712. 

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

  714. {

  715.     FLVContext *flv = s->priv_data;

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

  717.     int stream_type=-1;

  718.     int64_t next, pos, meta_pos;

  719.     int64_t dts, pts = AV_NOPTS_VALUE;

  720.     int av_uninit(channels);

  721.     int av_uninit(sample_rate);

  722.     AVStream *st    = NULL;

  723. 

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

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

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

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

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

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

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

  731.         av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);

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

  733.             return AVERROR_EOF;

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

  735.         flags = 0;

  736. 

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

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

  739.             if (pos == validate_pos) {

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

  741.                     VALIDATE_INDEX_TS_THRESH) {

  742.                     flv->validate_next++;

  743.                 } else {

  744.                     clear_index_entries(s, validate_pos);

  745.                     flv->validate_count = 0;

  746.                 }

  747.             } else if (pos > validate_pos) {

  748.                 clear_index_entries(s, validate_pos);

  749.                 flv->validate_count = 0;

  750.             }

  751.         }

  752. 

  753.         if (size == 0)

  754.             continue;

  755. 

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

  757. 

  758.         if (type == FLV_TAG_TYPE_AUDIO) {

  759.             stream_type = FLV_STREAM_TYPE_AUDIO;

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

  761.             size--;

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

  763.             stream_type = FLV_STREAM_TYPE_VIDEO;

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

  765.             size--;

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

  767.                 goto skip;

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

  769.             stream_type=FLV_STREAM_TYPE_DATA;

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

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

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

  773.                     goto skip;

  774.                 }

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

  776.             }

  777.         } else {

  778.             av_log(s, AV_LOG_DEBUG,

  779.                    "skipping flv packet: type %d, size %d, flags %d\n",

  780.                    type, size, flags);

  781. skip:

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

  783.             continue;

  784.         }

  785. 

  786.         /* skip empty data packets */

  787.         if (!size)

  788.             continue;

  789. 

  790.         /* now find stream */

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

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

  793.             if (stream_type == FLV_STREAM_TYPE_AUDIO) {

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

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

  796.                     break;

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

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

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

  800.                     break;

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

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

  803.                     break;

  804.             }

  805.         }

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

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

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

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

  810.             if (!st)

  811.                 return AVERROR(ENOMEM);

  812. 

  813.         }

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

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

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

  817.             || st->discard >= AVDISCARD_ALL

  818.         ) {

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

  820.             continue;

  821.         }

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

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

  824.         break;

  825.     }

  826. 

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

  828.     // the duration from the timestamps

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

  830.         int size;

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

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

  833. retry_duration:

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

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

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

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

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

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

  840.             if (ts)

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

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

  843.                 fsize -= size+4;

  844.                 goto retry_duration;

  845.             }

  846.         }

  847. 

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

  849.         flv->searched_for_end = 1;

  850.     }

  851. 

  852.     if (stream_type == FLV_STREAM_TYPE_AUDIO) {

  853.         int bits_per_coded_sample;

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

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

  856.                                 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;

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

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

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

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

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

  862.                                                ? AV_CH_LAYOUT_MONO

  863.                                                : AV_CH_LAYOUT_STEREO;

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

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

  866.         }

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

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

  869.                                 flags & FLV_AUDIO_CODECID_MASK);

  870.             flv->last_sample_rate =

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

  872.             flv->last_channels    =

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

  874.         } else {

  875.             AVCodecContext ctx;

  876.             ctx.sample_rate = sample_rate;

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

  878.             sample_rate = ctx.sample_rate;

  879.         }

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

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

  882.     }

  883. 

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

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

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

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

  888.         size--;

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

  890.             // sign extension

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

  892.             pts = dts + cts;

  893.             if (cts < 0) { // dts are wrong

  894.                 flv->wrong_dts = 1;

  895.                 av_log(s, AV_LOG_WARNING,

  896.                        "negative cts, previous timestamps might be wrong\n");

  897.             }

  898.             if (flv->wrong_dts)

  899.                 dts = AV_NOPTS_VALUE;

  900.         }

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

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

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

  904.                     return ret;

  905.                 ret = AVERROR(EAGAIN);

  906.                 goto leave;

  907.             }

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

  909.                 return ret;

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

  911.                 MPEG4AudioConfig cfg;

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

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

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

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

  916.                 if (cfg.ext_sample_rate)

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

  918.                 else

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

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

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

  922.                 }

  923.             }

  924. 

  925.             ret = AVERROR(EAGAIN);

  926.             goto leave;

  927.         }

  928.     }

  929. 

  930.     /* skip empty data packets */

  931.     if (!size) {

  932.         ret = AVERROR(EAGAIN);

  933.         goto leave;

  934.     }

  935. 

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

  937.     if (ret < 0)

  938.         return ret;

  939.     pkt->dts          = dts;

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

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

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

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

  944.                                                 flv->new_extradata_size[stream_type]);

  945.         if (side) {

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

  947.                    flv->new_extradata_size[stream_type]);

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

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

  950.         }

  951.     }

  952.     if (stream_type == FLV_STREAM_TYPE_AUDIO &&

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

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

  955.         flv->last_sample_rate = sample_rate;

  956.         flv->last_channels    = channels;

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

  958.     }

  959. 

  960.     if (    stream_type == FLV_STREAM_TYPE_AUDIO ||

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

  962.             stream_type == FLV_STREAM_TYPE_DATA)

  963.         pkt->flags |= AV_PKT_FLAG_KEY;

  964. 

  965. leave:

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

  967.     return ret;

  968. }

  969. 

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

  971.                          int64_t ts, int flags)

  972. {

  973.     FLVContext *flv = s->priv_data;

  974.     flv->validate_count = 0;

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

  976. }

  977. 

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

  979. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  980. static const AVOption options[] = {

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

  982.     { NULL }

  983. };

  984. 

  985. static const AVClass flv_class = {

  986.     .class_name = "flvdec",

  987.     .item_name  = av_default_item_name,

  988.     .option     = options,

  989.     .version    = LIBAVUTIL_VERSION_INT,

  990. };

  991. 

  992. AVInputFormat ff_flv_demuxer = {

  993.     .name           = "flv",

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

  995.     .priv_data_size = sizeof(FLVContext),

  996.     .read_probe     = flv_probe,

  997.     .read_header    = flv_read_header,

  998.     .read_packet    = flv_read_packet,

  999.     .read_seek      = flv_read_seek,

  1000.     .read_close     = flv_read_close,

  1001.     .extensions     = "flv",

  1002.     .priv_class     = &flv_class,

  1003. };