mirror of
https://git.ffmpeg.org/ffmpeg.git
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283 lines
7.5 KiB
C
283 lines
7.5 KiB
C
/*
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* FLV encoder.
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* Copyright (c) 2003 The FFmpeg Project.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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#undef NDEBUG
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#include <assert.h>
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typedef struct FLVContext {
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int hasAudio;
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int hasVideo;
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int reserved;
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offset_t duration_offset;
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offset_t filesize_offset;
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int64_t duration;
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} FLVContext;
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static int get_audio_flags(AVCodecContext *enc){
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int flags = (enc->bits_per_sample == 16) ? 0x2 : 0x0;
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switch (enc->sample_rate) {
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case 44100:
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flags |= 0x0C;
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break;
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case 22050:
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flags |= 0x08;
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break;
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case 11025:
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flags |= 0x04;
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break;
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case 8000: //nellymoser only
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case 5512: //not mp3
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flags |= 0x00;
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break;
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default:
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av_log(enc, AV_LOG_ERROR, "flv doesnt support that sample rate, choose from (44100, 22050, 11025)\n");
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return -1;
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}
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if (enc->channels > 1) {
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flags |= 0x01;
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}
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switch(enc->codec_id){
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case CODEC_ID_MP3:
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flags |= 0x20 | 0x2;
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break;
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case CODEC_ID_PCM_S8:
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break;
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case CODEC_ID_PCM_S16BE:
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flags |= 0x60 | 0x2;
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break;
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case CODEC_ID_PCM_S16LE:
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flags |= 0x2;
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break;
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case CODEC_ID_ADPCM_SWF:
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flags |= 0x10;
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break;
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case 0:
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flags |= enc->codec_tag<<4;
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break;
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default:
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av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
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return -1;
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}
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return flags;
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}
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#define AMF_DOUBLE 0
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#define AMF_BOOLEAN 1
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#define AMF_STRING 2
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#define AMF_OBJECT 3
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#define AMF_MIXED_ARRAY 8
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#define AMF_ARRAY 10
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#define AMF_DATE 11
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static void put_amf_string(ByteIOContext *pb, const char *str)
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{
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size_t len = strlen(str);
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put_be16(pb, len);
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put_buffer(pb, str, len);
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}
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static void put_amf_double(ByteIOContext *pb, double d)
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{
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put_byte(pb, AMF_DOUBLE);
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put_be64(pb, av_dbl2int(d));
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}
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static int flv_write_header(AVFormatContext *s)
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{
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ByteIOContext *pb = &s->pb;
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FLVContext *flv = s->priv_data;
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int i, width, height, samplerate;
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double framerate = 0.0;
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int metadata_size_pos, data_size;
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flv->hasAudio = 0;
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flv->hasVideo = 0;
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put_tag(pb,"FLV");
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put_byte(pb,1);
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put_byte(pb,0); // delayed write
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put_be32(pb,9);
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put_be32(pb,0);
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for(i=0; i<s->nb_streams; i++){
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AVCodecContext *enc = s->streams[i]->codec;
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if (enc->codec_type == CODEC_TYPE_VIDEO) {
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width = enc->width;
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height = enc->height;
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if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
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framerate = av_q2d(s->streams[i]->r_frame_rate);
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} else {
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framerate = 1/av_q2d(s->streams[i]->codec->time_base);
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}
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flv->hasVideo=1;
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} else {
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flv->hasAudio=1;
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samplerate = enc->sample_rate;
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}
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av_set_pts_info(s->streams[i], 24, 1, 1000); /* 24 bit pts in ms */
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if(enc->codec_tag == 5){
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put_byte(pb,8); // message type
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put_be24(pb,0); // include flags
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put_be24(pb,0); // time stamp
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put_be32(pb,0); // reserved
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put_be32(pb,11); // size
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flv->reserved=5;
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}
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if(enc->codec_type == CODEC_TYPE_AUDIO && get_audio_flags(enc)<0)
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return -1;
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}
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/* write meta_tag */
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put_byte(pb, 18); // tag type META
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metadata_size_pos= url_ftell(pb);
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put_be24(pb, 0); // size of data part (sum of all parts below)
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put_be24(pb, 0); // time stamp
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put_be32(pb, 0); // reserved
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/* now data of data_size size */
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/* first event name as a string */
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put_byte(pb, AMF_STRING); // 1 byte
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put_amf_string(pb, "onMetaData"); // 12 bytes
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/* mixed array (hash) with size and string/type/data tuples */
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put_byte(pb, AMF_MIXED_ARRAY);
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put_be32(pb, 4*flv->hasVideo + flv->hasAudio + 2); // +2 for duration and file size
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put_amf_string(pb, "duration");
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flv->duration_offset= url_ftell(pb);
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put_amf_double(pb, 0); // delayed write
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if(flv->hasVideo){
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put_amf_string(pb, "width");
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put_amf_double(pb, width);
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put_amf_string(pb, "height");
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put_amf_double(pb, height);
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put_amf_string(pb, "videodatarate");
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put_amf_double(pb, s->bit_rate / 1024.0);
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put_amf_string(pb, "framerate");
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put_amf_double(pb, framerate);
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}
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if(flv->hasAudio){
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put_amf_string(pb, "audiosamplerate");
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put_amf_double(pb, samplerate);
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}
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put_amf_string(pb, "filesize");
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flv->filesize_offset= url_ftell(pb);
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put_amf_double(pb, 0); // delayed write
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put_amf_string(pb, "");
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put_byte(pb, 9); // end marker 1 byte
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/* write total size of tag */
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data_size= url_ftell(pb) - metadata_size_pos - 10;
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url_fseek(pb, metadata_size_pos, SEEK_SET);
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put_be24(pb, data_size);
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url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
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put_be32(pb, data_size + 11);
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return 0;
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}
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static int flv_write_trailer(AVFormatContext *s)
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{
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int64_t file_size;
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int flags = 0;
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ByteIOContext *pb = &s->pb;
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FLVContext *flv = s->priv_data;
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file_size = url_ftell(pb);
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flags |= flv->hasAudio ? 4 : 0;
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flags |= flv->hasVideo ? 1 : 0;
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url_fseek(pb, 4, SEEK_SET);
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put_byte(pb,flags);
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/* update informations */
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url_fseek(pb, flv->duration_offset, SEEK_SET);
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put_amf_double(pb, flv->duration / (double)1000);
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url_fseek(pb, flv->filesize_offset, SEEK_SET);
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put_amf_double(pb, file_size);
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url_fseek(pb, file_size, SEEK_SET);
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return 0;
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}
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static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ByteIOContext *pb = &s->pb;
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AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
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FLVContext *flv = s->priv_data;
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int size= pkt->size;
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int flags;
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// av_log(s, AV_LOG_DEBUG, "type:%d pts: %lld size:%d\n", enc->codec_type, timestamp, size);
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if (enc->codec_type == CODEC_TYPE_VIDEO) {
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put_byte(pb, 9);
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flags = 2; // choose h263
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flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator
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} else {
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assert(enc->codec_type == CODEC_TYPE_AUDIO);
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flags = get_audio_flags(enc);
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assert(size);
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put_byte(pb, 8);
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}
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put_be24(pb,size+1); // include flags
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put_be24(pb,pkt->pts);
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put_be32(pb,flv->reserved);
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put_byte(pb,flags);
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put_buffer(pb, pkt->data, size);
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put_be32(pb,size+1+11); // previous tag size
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flv->duration = pkt->pts + pkt->duration;
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put_flush_packet(pb);
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return 0;
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}
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AVOutputFormat flv_muxer = {
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"flv",
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"flv format",
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"video/x-flv",
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"flv",
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sizeof(FLVContext),
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#ifdef CONFIG_MP3LAME
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CODEC_ID_MP3,
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#else // CONFIG_MP3LAME
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CODEC_ID_NONE,
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#endif // CONFIG_MP3LAME
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CODEC_ID_FLV1,
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flv_write_header,
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flv_write_packet,
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flv_write_trailer,
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};
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