ffmpeg / libavformat / flvdec.c @ 578d6861
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/*
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* FLV demuxer
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* Copyright (c) 2003 The Libav Project
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*
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* This demuxer will generate a 1 byte extradata for VP6F content.
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* It is composed of:
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* - upper 4bits: difference between encoded width and visible width
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* - lower 4bits: difference between encoded height and visible height
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h" |
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#include "libavcodec/bytestream.h" |
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#include "libavcodec/mpeg4audio.h" |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "flv.h" |
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#define KEYFRAMES_TAG "keyframes" |
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#define KEYFRAMES_TIMESTAMP_TAG "times" |
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#define KEYFRAMES_BYTEOFFSET_TAG "filepositions" |
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typedef struct { |
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int wrong_dts; ///< wrong dts due to negative cts |
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} FLVContext; |
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static int flv_probe(AVProbeData *p) |
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{ |
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const uint8_t *d;
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|
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d = p->buf; |
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if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) { |
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return AVPROBE_SCORE_MAX;
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} |
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return 0; |
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} |
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|
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static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) { |
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AVCodecContext *acodec = astream->codec; |
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switch(flv_codecid) {
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//no distinction between S16 and S8 PCM codec flags
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case FLV_CODECID_PCM:
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acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
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#if HAVE_BIGENDIAN
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CODEC_ID_PCM_S16BE; |
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#else
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CODEC_ID_PCM_S16LE; |
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#endif
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break;
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case FLV_CODECID_PCM_LE:
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acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break; |
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case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break; |
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case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break; |
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case FLV_CODECID_SPEEX:
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acodec->codec_id = CODEC_ID_SPEEX; |
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acodec->sample_rate = 16000;
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break;
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case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break; |
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case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
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acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate |
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acodec->codec_id = CODEC_ID_NELLYMOSER; |
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break;
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case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
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acodec->sample_rate = 16000;
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acodec->codec_id = CODEC_ID_NELLYMOSER; |
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break;
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case FLV_CODECID_NELLYMOSER:
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acodec->codec_id = CODEC_ID_NELLYMOSER; |
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break;
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default:
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av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
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acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET; |
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} |
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} |
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static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) { |
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AVCodecContext *vcodec = vstream->codec; |
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switch(flv_codecid) {
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case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break; |
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case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break; |
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case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break; |
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case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
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case FLV_CODECID_VP6A :
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if(flv_codecid == FLV_CODECID_VP6A)
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vcodec->codec_id = CODEC_ID_VP6A; |
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if(vcodec->extradata_size != 1) { |
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vcodec->extradata_size = 1;
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vcodec->extradata = av_malloc(1);
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} |
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vcodec->extradata[0] = avio_r8(s->pb);
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return 1; // 1 byte body size adjustment for flv_read_packet() |
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case FLV_CODECID_H264:
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vcodec->codec_id = CODEC_ID_H264; |
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return 3; // not 4, reading packet type will consume one byte |
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default:
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av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
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vcodec->codec_tag = flv_codecid; |
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} |
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return 0; |
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} |
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static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) { |
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int length = avio_rb16(ioc);
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if(length >= buffsize) {
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avio_skip(ioc, length); |
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return -1; |
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} |
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avio_read(ioc, buffer, length); |
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buffer[length] = '\0';
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return length;
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} |
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static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) { |
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unsigned int arraylen = 0, timeslen = 0, fileposlen = 0, i; |
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double num_val;
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char str_val[256]; |
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int64_t *times = NULL;
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int64_t *filepositions = NULL;
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int ret = AVERROR(ENOSYS);
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int64_t initial_pos = avio_tell(ioc); |
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while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { |
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int64_t* current_array; |
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// Expect array object in context
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if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
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break;
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arraylen = avio_rb32(ioc); |
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/*
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* Expect only 'times' or 'filepositions' sub-arrays in other case refuse to use such metadata
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* for indexing
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*/
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if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) {
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if (!(times = av_mallocz(sizeof(*times) * arraylen))) { |
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ret = AVERROR(ENOMEM); |
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goto finish;
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} |
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timeslen = arraylen; |
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current_array = times; |
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} else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions) { |
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if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) { |
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ret = AVERROR(ENOMEM); |
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goto finish;
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} |
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fileposlen = arraylen; |
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current_array = filepositions; |
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} else // unexpected metatag inside keyframes, will not use such metadata for indexing |
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break;
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for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) { |
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if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
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goto finish;
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num_val = av_int2dbl(avio_rb64(ioc)); |
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current_array[i] = num_val; |
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} |
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if (times && filepositions) {
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// All done, exiting at a position allowing amf_parse_object
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// to finish parsing the object
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ret = 0;
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break;
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} |
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} |
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if (timeslen == fileposlen)
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for(i = 0; i < arraylen; i++) |
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av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME); |
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else
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av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
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finish:
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av_freep(×); |
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av_freep(&filepositions); |
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// If we got unexpected data, but successfully reset back to
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// the start pos, the caller can continue parsing
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if (ret < 0 && avio_seek(ioc, initial_pos, SEEK_SET) > 0) |
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return 0; |
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return ret;
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} |
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static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) { |
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AVCodecContext *acodec, *vcodec; |
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AVIOContext *ioc; |
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AMFDataType amf_type; |
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char str_val[256]; |
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double num_val;
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num_val = 0;
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ioc = s->pb; |
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amf_type = avio_r8(ioc); |
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switch(amf_type) {
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case AMF_DATA_TYPE_NUMBER:
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num_val = av_int2dbl(avio_rb64(ioc)); break;
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case AMF_DATA_TYPE_BOOL:
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num_val = avio_r8(ioc); break;
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case AMF_DATA_TYPE_STRING:
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if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0) |
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return -1; |
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break;
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case AMF_DATA_TYPE_OBJECT: {
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unsigned int keylen; |
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if (key && !strcmp(KEYFRAMES_TAG, key) && depth == 1) |
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if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0) |
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return -1; |
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while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) { |
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avio_skip(ioc, keylen); //skip key string
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if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) |
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return -1; //if we couldn't skip, bomb out. |
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} |
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if(avio_r8(ioc) != AMF_END_OF_OBJECT)
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return -1; |
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} |
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break;
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case AMF_DATA_TYPE_NULL:
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case AMF_DATA_TYPE_UNDEFINED:
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case AMF_DATA_TYPE_UNSUPPORTED:
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break; //these take up no additional space |
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case AMF_DATA_TYPE_MIXEDARRAY:
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avio_skip(ioc, 4); //skip 32-bit max array index |
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while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { |
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//this is the only case in which we would want a nested parse to not skip over the object
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if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0) |
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return -1; |
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} |
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if(avio_r8(ioc) != AMF_END_OF_OBJECT)
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return -1; |
250 |
break;
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case AMF_DATA_TYPE_ARRAY: {
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unsigned int arraylen, i; |
253 |
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arraylen = avio_rb32(ioc); |
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for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) { |
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if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) |
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return -1; //if we couldn't skip, bomb out. |
258 |
} |
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} |
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break;
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case AMF_DATA_TYPE_DATE:
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avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16) |
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break;
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default: //unsupported type, we couldn't skip |
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return -1; |
266 |
} |
267 |
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if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL |
269 |
acodec = astream ? astream->codec : NULL;
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vcodec = vstream ? vstream->codec : NULL;
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|
272 |
if(amf_type == AMF_DATA_TYPE_BOOL) {
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av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val)); |
274 |
av_metadata_set2(&s->metadata, key, str_val, 0);
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} else if(amf_type == AMF_DATA_TYPE_NUMBER) { |
276 |
snprintf(str_val, sizeof(str_val), "%.f", num_val); |
277 |
av_metadata_set2(&s->metadata, key, str_val, 0);
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if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE; |
279 |
else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0)) |
280 |
vcodec->bit_rate = num_val * 1024.0; |
281 |
else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0)) |
282 |
acodec->bit_rate = num_val * 1024.0; |
283 |
} else if (amf_type == AMF_DATA_TYPE_STRING) |
284 |
av_metadata_set2(&s->metadata, key, str_val, 0);
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285 |
} |
286 |
|
287 |
return 0; |
288 |
} |
289 |
|
290 |
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) { |
291 |
AMFDataType type; |
292 |
AVStream *stream, *astream, *vstream; |
293 |
AVIOContext *ioc; |
294 |
int i;
|
295 |
char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want. |
296 |
|
297 |
astream = NULL;
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298 |
vstream = NULL;
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299 |
ioc = s->pb; |
300 |
|
301 |
//first object needs to be "onMetaData" string
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302 |
type = avio_r8(ioc); |
303 |
if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData")) |
304 |
return -1; |
305 |
|
306 |
//find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
|
307 |
for(i = 0; i < s->nb_streams; i++) { |
308 |
stream = s->streams[i]; |
309 |
if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
|
310 |
else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream; |
311 |
} |
312 |
|
313 |
//parse the second object (we want a mixed array)
|
314 |
if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0) |
315 |
return -1; |
316 |
|
317 |
return 0; |
318 |
} |
319 |
|
320 |
static AVStream *create_stream(AVFormatContext *s, int is_audio){ |
321 |
AVStream *st = av_new_stream(s, is_audio); |
322 |
if (!st)
|
323 |
return NULL; |
324 |
st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO; |
325 |
av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */ |
326 |
return st;
|
327 |
} |
328 |
|
329 |
static int flv_read_header(AVFormatContext *s, |
330 |
AVFormatParameters *ap) |
331 |
{ |
332 |
int offset, flags;
|
333 |
|
334 |
avio_skip(s->pb, 4);
|
335 |
flags = avio_r8(s->pb); |
336 |
/* old flvtool cleared this field */
|
337 |
/* FIXME: better fix needed */
|
338 |
if (!flags) {
|
339 |
flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO; |
340 |
av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
|
341 |
} |
342 |
|
343 |
if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
|
344 |
!= (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO)) |
345 |
s->ctx_flags |= AVFMTCTX_NOHEADER; |
346 |
|
347 |
if(flags & FLV_HEADER_FLAG_HASVIDEO){
|
348 |
if(!create_stream(s, 0)) |
349 |
return AVERROR(ENOMEM);
|
350 |
} |
351 |
if(flags & FLV_HEADER_FLAG_HASAUDIO){
|
352 |
if(!create_stream(s, 1)) |
353 |
return AVERROR(ENOMEM);
|
354 |
} |
355 |
|
356 |
offset = avio_rb32(s->pb); |
357 |
avio_seek(s->pb, offset, SEEK_SET); |
358 |
avio_skip(s->pb, 4);
|
359 |
|
360 |
s->start_time = 0;
|
361 |
|
362 |
return 0; |
363 |
} |
364 |
|
365 |
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size) |
366 |
{ |
367 |
av_free(st->codec->extradata); |
368 |
st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE); |
369 |
if (!st->codec->extradata)
|
370 |
return AVERROR(ENOMEM);
|
371 |
st->codec->extradata_size = size; |
372 |
avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); |
373 |
return 0; |
374 |
} |
375 |
|
376 |
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt) |
377 |
{ |
378 |
FLVContext *flv = s->priv_data; |
379 |
int ret, i, type, size, flags, is_audio;
|
380 |
int64_t next, pos; |
381 |
int64_t dts, pts = AV_NOPTS_VALUE; |
382 |
AVStream *st = NULL;
|
383 |
|
384 |
for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */ |
385 |
pos = avio_tell(s->pb); |
386 |
type = avio_r8(s->pb); |
387 |
size = avio_rb24(s->pb); |
388 |
dts = avio_rb24(s->pb); |
389 |
dts |= avio_r8(s->pb) << 24;
|
390 |
// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
|
391 |
if (s->pb->eof_reached)
|
392 |
return AVERROR_EOF;
|
393 |
avio_skip(s->pb, 3); /* stream id, always 0 */ |
394 |
flags = 0;
|
395 |
|
396 |
if(size == 0) |
397 |
continue;
|
398 |
|
399 |
next= size + avio_tell(s->pb); |
400 |
|
401 |
if (type == FLV_TAG_TYPE_AUDIO) {
|
402 |
is_audio=1;
|
403 |
flags = avio_r8(s->pb); |
404 |
size--; |
405 |
} else if (type == FLV_TAG_TYPE_VIDEO) { |
406 |
is_audio=0;
|
407 |
flags = avio_r8(s->pb); |
408 |
size--; |
409 |
if ((flags & 0xf0) == 0x50) /* video info / command frame */ |
410 |
goto skip;
|
411 |
} else {
|
412 |
if (type == FLV_TAG_TYPE_META && size > 13+1+4) |
413 |
flv_read_metabody(s, next); |
414 |
else /* skip packet */ |
415 |
av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
|
416 |
skip:
|
417 |
avio_seek(s->pb, next, SEEK_SET); |
418 |
continue;
|
419 |
} |
420 |
|
421 |
/* skip empty data packets */
|
422 |
if (!size)
|
423 |
continue;
|
424 |
|
425 |
/* now find stream */
|
426 |
for(i=0;i<s->nb_streams;i++) { |
427 |
st = s->streams[i]; |
428 |
if (st->id == is_audio)
|
429 |
break;
|
430 |
} |
431 |
if(i == s->nb_streams){
|
432 |
av_log(s, AV_LOG_ERROR, "invalid stream\n");
|
433 |
st= create_stream(s, is_audio); |
434 |
s->ctx_flags &= ~AVFMTCTX_NOHEADER; |
435 |
} |
436 |
// av_log(s, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
|
437 |
if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
|
438 |
||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio)) |
439 |
|| st->discard >= AVDISCARD_ALL |
440 |
){ |
441 |
avio_seek(s->pb, next, SEEK_SET); |
442 |
continue;
|
443 |
} |
444 |
if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
|
445 |
av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
|
446 |
break;
|
447 |
} |
448 |
|
449 |
// if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
|
450 |
if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
|
451 |
int size;
|
452 |
const int64_t pos= avio_tell(s->pb);
|
453 |
const int64_t fsize= avio_size(s->pb);
|
454 |
avio_seek(s->pb, fsize-4, SEEK_SET);
|
455 |
size= avio_rb32(s->pb); |
456 |
avio_seek(s->pb, fsize-3-size, SEEK_SET);
|
457 |
if(size == avio_rb24(s->pb) + 11){ |
458 |
uint32_t ts = avio_rb24(s->pb); |
459 |
ts |= avio_r8(s->pb) << 24;
|
460 |
s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
|
461 |
} |
462 |
avio_seek(s->pb, pos, SEEK_SET); |
463 |
} |
464 |
|
465 |
if(is_audio){
|
466 |
if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
|
467 |
st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1; |
468 |
st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3); |
469 |
st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8; |
470 |
} |
471 |
if(!st->codec->codec_id){
|
472 |
flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK); |
473 |
} |
474 |
}else{
|
475 |
size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK); |
476 |
} |
477 |
|
478 |
if (st->codec->codec_id == CODEC_ID_AAC ||
|
479 |
st->codec->codec_id == CODEC_ID_H264) { |
480 |
int type = avio_r8(s->pb);
|
481 |
size--; |
482 |
if (st->codec->codec_id == CODEC_ID_H264) {
|
483 |
int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension |
484 |
pts = dts + cts; |
485 |
if (cts < 0) { // dts are wrong |
486 |
flv->wrong_dts = 1;
|
487 |
av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
|
488 |
} |
489 |
if (flv->wrong_dts)
|
490 |
dts = AV_NOPTS_VALUE; |
491 |
} |
492 |
if (type == 0) { |
493 |
if ((ret = flv_get_extradata(s, st, size)) < 0) |
494 |
return ret;
|
495 |
if (st->codec->codec_id == CODEC_ID_AAC) {
|
496 |
MPEG4AudioConfig cfg; |
497 |
ff_mpeg4audio_get_config(&cfg, st->codec->extradata, |
498 |
st->codec->extradata_size); |
499 |
st->codec->channels = cfg.channels; |
500 |
if (cfg.ext_sample_rate)
|
501 |
st->codec->sample_rate = cfg.ext_sample_rate; |
502 |
else
|
503 |
st->codec->sample_rate = cfg.sample_rate; |
504 |
av_dlog(s, "mp4a config channels %d sample rate %d\n",
|
505 |
st->codec->channels, st->codec->sample_rate); |
506 |
} |
507 |
|
508 |
ret = AVERROR(EAGAIN); |
509 |
goto leave;
|
510 |
} |
511 |
} |
512 |
|
513 |
/* skip empty data packets */
|
514 |
if (!size) {
|
515 |
ret = AVERROR(EAGAIN); |
516 |
goto leave;
|
517 |
} |
518 |
|
519 |
ret= av_get_packet(s->pb, pkt, size); |
520 |
if (ret < 0) { |
521 |
return AVERROR(EIO);
|
522 |
} |
523 |
/* note: we need to modify the packet size here to handle the last
|
524 |
packet */
|
525 |
pkt->size = ret; |
526 |
pkt->dts = dts; |
527 |
pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts; |
528 |
pkt->stream_index = st->index; |
529 |
|
530 |
if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
|
531 |
pkt->flags |= AV_PKT_FLAG_KEY; |
532 |
|
533 |
leave:
|
534 |
avio_skip(s->pb, 4);
|
535 |
return ret;
|
536 |
} |
537 |
|
538 |
static int flv_read_seek(AVFormatContext *s, int stream_index, |
539 |
int64_t ts, int flags)
|
540 |
{ |
541 |
return avio_seek_time(s->pb, stream_index, ts, flags);
|
542 |
} |
543 |
|
544 |
#if 0 /* don't know enough to implement this */
|
545 |
static int flv_read_seek2(AVFormatContext *s, int stream_index,
|
546 |
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
|
547 |
{
|
548 |
int ret = AVERROR(ENOSYS);
|
549 |
|
550 |
if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
|
551 |
|
552 |
if (!s->pb->seekable) {
|
553 |
if (stream_index < 0) {
|
554 |
stream_index = av_find_default_stream_index(s);
|
555 |
if (stream_index < 0)
|
556 |
return -1;
|
557 |
|
558 |
/* timestamp for default must be expressed in AV_TIME_BASE units */
|
559 |
ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
|
560 |
flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
|
561 |
}
|
562 |
ret = avio_seek_time(s->pb, stream_index, ts, flags);
|
563 |
}
|
564 |
|
565 |
if (ret == AVERROR(ENOSYS))
|
566 |
ret = av_seek_frame(s, stream_index, ts, flags);
|
567 |
return ret;
|
568 |
}
|
569 |
#endif
|
570 |
|
571 |
AVInputFormat ff_flv_demuxer = { |
572 |
"flv",
|
573 |
NULL_IF_CONFIG_SMALL("FLV format"),
|
574 |
sizeof(FLVContext),
|
575 |
flv_probe, |
576 |
flv_read_header, |
577 |
flv_read_packet, |
578 |
.read_seek = flv_read_seek, |
579 |
#if 0
|
580 |
.read_seek2 = flv_read_seek2,
|
581 |
#endif
|
582 |
.extensions = "flv",
|
583 |
.value = CODEC_ID_FLV1, |
584 |
}; |