mirror of https://git.ffmpeg.org/ffmpeg.git
398 lines
14 KiB
C
398 lines
14 KiB
C
/*
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* FLV demuxer
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* Copyright (c) 2003 The FFmpeg 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "avformat.h"
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#include "flv.h"
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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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d = p->buf;
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if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0) {
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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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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_sample == 8 ? CODEC_ID_PCM_S8 :
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#ifdef WORDS_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_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
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case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; 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_8HZ_MONO:
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acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
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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_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] = get_byte(s->pb);
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return 1; // 1 byte body size adjustment for flv_read_packet()
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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(ByteIOContext *ioc, char *buffer, int buffsize) {
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int length = get_be16(ioc);
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if(length >= buffsize) {
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url_fskip(ioc, length);
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return -1;
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}
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get_buffer(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 amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, unsigned int max_pos, int depth) {
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AVCodecContext *acodec, *vcodec;
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ByteIOContext *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 = get_byte(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(get_be64(ioc)); break;
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case AMF_DATA_TYPE_BOOL:
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num_val = get_byte(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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while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
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url_fskip(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(get_byte(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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url_fskip(ioc, 4); //skip 32-bit max array index
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while(url_ftell(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(get_byte(ioc) != AMF_END_OF_OBJECT)
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return -1;
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break;
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case AMF_DATA_TYPE_ARRAY: {
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unsigned int arraylen, i;
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arraylen = get_be32(ioc);
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for(i = 0; i < arraylen && url_ftell(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.
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}
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}
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break;
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case AMF_DATA_TYPE_DATE:
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url_fskip(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;
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}
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if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
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acodec = astream ? astream->codec : NULL;
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vcodec = vstream ? vstream->codec : NULL;
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if(amf_type == AMF_DATA_TYPE_BOOL) {
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if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1;
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} else if(amf_type == AMF_DATA_TYPE_NUMBER) {
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if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
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// else if(!strcmp(key, "width") && vcodec && num_val > 0) vcodec->width = num_val;
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// else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val;
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else if(!strcmp(key, "audiocodecid") && acodec && 0 <= (int)num_val)
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flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
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else if(!strcmp(key, "videocodecid") && vcodec && 0 <= (int)num_val)
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flv_set_video_codec(s, vstream, (int)num_val);
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else if(!strcmp(key, "audiosamplesize") && acodec && 0 < (int)num_val) {
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acodec->bits_per_sample = num_val;
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//we may have to rewrite a previously read codecid because FLV only marks PCM endianness.
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if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE))
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acodec->codec_id = CODEC_ID_PCM_S8;
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}
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else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) {
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//some tools, like FLVTool2, write consistently approximate metadata sample rates
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if (!acodec->sample_rate) {
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switch((int)num_val) {
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case 44000: acodec->sample_rate = 44100 ; break;
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case 22000: acodec->sample_rate = 22050 ; break;
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case 11000: acodec->sample_rate = 11025 ; break;
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case 5000 : acodec->sample_rate = 5512 ; break;
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default : acodec->sample_rate = num_val;
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}
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}
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}
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}
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}
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return 0;
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}
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static int flv_read_metabody(AVFormatContext *s, unsigned int next_pos) {
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AMFDataType type;
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AVStream *stream, *astream, *vstream;
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ByteIOContext *ioc;
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int i, keylen;
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char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
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astream = NULL;
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vstream = NULL;
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keylen = 0;
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ioc = s->pb;
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//first object needs to be "onMetaData" string
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type = get_byte(ioc);
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if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
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return -1;
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//find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
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for(i = 0; i < s->nb_streams; i++) {
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stream = s->streams[i];
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if (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
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else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
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}
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//parse the second object (we want a mixed array)
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if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
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return -1;
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return 0;
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}
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static AVStream *create_stream(AVFormatContext *s, int is_audio){
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AVStream *st = av_new_stream(s, is_audio);
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if (!st)
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return NULL;
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st->codec->codec_type = is_audio ? CODEC_TYPE_AUDIO : CODEC_TYPE_VIDEO;
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av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
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return st;
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}
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static int flv_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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int offset, flags;
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url_fskip(s->pb, 4);
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flags = get_byte(s->pb);
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/* old flvtool cleared this field */
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/* FIXME: better fix needed */
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if (!flags) {
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flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
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av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
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}
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if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
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!= (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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if(flags & FLV_HEADER_FLAG_HASVIDEO){
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if(!create_stream(s, 0))
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return AVERROR(ENOMEM);
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}
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if(flags & FLV_HEADER_FLAG_HASAUDIO){
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if(!create_stream(s, 1))
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return AVERROR(ENOMEM);
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}
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offset = get_be32(s->pb);
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url_fseek(s->pb, offset, SEEK_SET);
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s->start_time = 0;
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return 0;
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}
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static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, i, type, size, flags, is_audio, next, pos;
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unsigned dts;
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AVStream *st = NULL;
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for(;;){
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pos = url_ftell(s->pb);
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url_fskip(s->pb, 4); /* size of previous packet */
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type = get_byte(s->pb);
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size = get_be24(s->pb);
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dts = get_be24(s->pb);
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dts |= get_byte(s->pb) << 24;
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// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
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if (url_feof(s->pb))
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return AVERROR(EIO);
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url_fskip(s->pb, 3); /* stream id, always 0 */
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flags = 0;
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if(size == 0)
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continue;
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next= size + url_ftell(s->pb);
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if (type == FLV_TAG_TYPE_AUDIO) {
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is_audio=1;
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flags = get_byte(s->pb);
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} else if (type == FLV_TAG_TYPE_VIDEO) {
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is_audio=0;
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flags = get_byte(s->pb);
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} else {
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if (type == FLV_TAG_TYPE_META && size > 13+1+4)
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flv_read_metabody(s, next);
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else /* skip packet */
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av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
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url_fseek(s->pb, next, SEEK_SET);
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continue;
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}
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/* now find stream */
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for(i=0;i<s->nb_streams;i++) {
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st = s->streams[i];
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if (st->id == is_audio)
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break;
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}
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if(i == s->nb_streams){
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av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
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st= create_stream(s, is_audio);
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s->ctx_flags &= ~AVFMTCTX_NOHEADER;
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}
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// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
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if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
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||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
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|| st->discard >= AVDISCARD_ALL
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){
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url_fseek(s->pb, next, SEEK_SET);
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continue;
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}
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if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
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av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
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break;
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}
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// if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
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if(!url_is_streamed(s->pb) && s->duration==AV_NOPTS_VALUE){
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int size;
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const int pos= url_ftell(s->pb);
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const int fsize= url_fsize(s->pb);
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url_fseek(s->pb, fsize-4, SEEK_SET);
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size= get_be32(s->pb);
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url_fseek(s->pb, fsize-3-size, SEEK_SET);
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if(size == get_be24(s->pb) + 11){
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s->duration= get_be24(s->pb) * (int64_t)AV_TIME_BASE / 1000;
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}
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url_fseek(s->pb, pos, SEEK_SET);
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}
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if(is_audio){
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if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
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st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
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if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
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st->codec->sample_rate= 8000;
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else
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st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
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st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
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flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
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}
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}else{
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size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
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}
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ret= av_get_packet(s->pb, pkt, size - 1);
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if (ret <= 0) {
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return AVERROR(EIO);
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}
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/* note: we need to modify the packet size here to handle the last
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packet */
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pkt->size = ret;
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pkt->dts = dts;
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pkt->stream_index = st->index;
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if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
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pkt->flags |= PKT_FLAG_KEY;
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return ret;
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}
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AVInputFormat flv_demuxer = {
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"flv",
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"flv format",
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0,
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flv_probe,
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flv_read_header,
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flv_read_packet,
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.extensions = "flv",
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.value = CODEC_ID_FLV1,
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};
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