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* Uses libogg, but requires libvorbisenc to construct correct headers
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* when containing Vorbis stream -- currently the only format supported
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* This file is part of FFmpeg.
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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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* 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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* 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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#include <ogg/ogg.h>
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#include <vorbis/vorbisenc.h>
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#include "avformat.h"
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#include "oggvorbis.h"
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#define DECODER_BUFFER_SIZE 4096
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ogg_stream_state os ;
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int header_handled ;
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ogg_int64_t base_packet_no ;
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ogg_int64_t base_granule_pos ;
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ogg_sync_state oy ;
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static int ogg_write_header(AVFormatContext *avfcontext)
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static int ogg_write_header(AVFormatContext *avfcontext)
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OggContext *context = avfcontext->priv_data;
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AVCodecContext *avccontext ;
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ogg_packet header, header_comm, header_code ;
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ogg_stream_init(&context->os, rand());
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ogg_packet *op= &context->op;
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ogg_stream_init(&context->os, 31415);
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for(n = 0 ; n < avfcontext->nb_streams ; n++) {
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avccontext = &avfcontext->streams[n]->codec ;
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/* begin vorbis specific code */
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vorbis_info_init(&vi) ;
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/* code copied from libavcodec/oggvorbis.c */
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if(oggvorbis_init_encoder(&vi, avccontext) < 0) {
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fprintf(stderr, "ogg_write_header: init_encoder failed") ;
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vorbis_analysis_init(&vd, &vi) ;
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vorbis_block_init(&vd, &vb) ;
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vorbis_comment_init(&vc) ;
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vorbis_comment_add_tag(&vc, "encoder", "ffmpeg") ;
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if(*avfcontext->title)
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vorbis_comment_add_tag(&vc, "title", avfcontext->title) ;
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vorbis_analysis_headerout(&vd, &vc, &header,
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&header_comm, &header_code) ;
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ogg_stream_packetin(&context->os, &header) ;
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ogg_stream_packetin(&context->os, &header_comm) ;
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ogg_stream_packetin(&context->os, &header_code) ;
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vorbis_block_clear(&vb) ;
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vorbis_dsp_clear(&vd) ;
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vorbis_info_clear(&vi) ;
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vorbis_comment_clear(&vc) ;
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/* end of vorbis specific code */
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context->header_handled = 0 ;
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context->base_packet_no = 0 ;
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AVCodecContext *codec = avfcontext->streams[n]->codec;
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uint8_t *headers = codec->extradata;
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int headers_len = codec->extradata_size;
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uint8_t *header_start[3];
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av_set_pts_info(avfcontext->streams[n], 60, 1, AV_TIME_BASE);
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for(j=1,i=0;i<2;++i, ++j) {
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while(j<headers_len && headers[j]==0xff) {
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header_len[i]+=headers[j];
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header_len[2]=headers_len-header_len[0]-header_len[1]-j;
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header_start[0] = headers;
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header_start[1] = header_start[0] + header_len[0];
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header_start[2] = header_start[1] + header_len[1];
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op->bytes = header_len[i];
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op->packet= header_start[i];
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op->b_o_s= op->packetno==0;
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ogg_stream_packetin(&context->os, op);
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op->packetno++; //FIXME multiple streams
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context->header_handled = 0 ;
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static int ogg_write_packet(AVFormatContext *avfcontext,
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unsigned char *buf, int size, int force_pts)
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static int ogg_write_packet(AVFormatContext *avfcontext, AVPacket *pkt)
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OggContext *context = avfcontext->priv_data ;
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AVCodecContext *avctx= avfcontext->streams[pkt->stream_index]->codec;
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ogg_packet *op= &context->op;
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pts= av_rescale(pkt->pts, avctx->sample_rate, AV_TIME_BASE);
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// av_log(avfcontext, AV_LOG_DEBUG, "M%d\n", size);
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/* flush header packets so audio starts on a new page */
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if(!context->header_handled) {
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while(ogg_stream_flush(&context->os, &og)) {
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put_buffer(&avfcontext->pb, og.header, og.header_len) ;
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put_buffer(&avfcontext->pb, og.body, og.body_len) ;
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put_flush_packet(&avfcontext->pb);
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context->header_handled = 1 ;
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op = (ogg_packet*)(buf + l) ;
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op->packet = buf + l + sizeof(ogg_packet) ; /* fix data pointer */
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if(!context->base_packet_no) { /* this is the first packet */
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context->base_packet_no = op->packetno ;
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context->base_granule_pos = op->granulepos ;
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/* correct the fields in the packet -- essential for streaming */
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op->packetno -= context->base_packet_no ;
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op->granulepos -= context->base_granule_pos ;
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ogg_stream_packetin(&context->os, op) ;
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l += sizeof(ogg_packet) + op->bytes ;
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while(ogg_stream_pageout(&context->os, &og)) {
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put_buffer(&avfcontext->pb, og.header, og.header_len) ;
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put_buffer(&avfcontext->pb, og.body, og.body_len) ;
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put_flush_packet(&avfcontext->pb);
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while(ogg_stream_flush(&context->os, &og)) {
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put_buffer(&avfcontext->pb, og.header, og.header_len) ;
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put_buffer(&avfcontext->pb, og.body, og.body_len) ;
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put_flush_packet(&avfcontext->pb);
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context->header_handled = 1 ;
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op->packet = (uint8_t*) pkt->data;
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op->bytes = pkt->size;
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op->b_o_s = op->packetno == 0;
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/* correct the fields in the packet -- essential for streaming */
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ogg_stream_packetin(&context->os, op);
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while(ogg_stream_pageout(&context->os, &og)) {
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put_buffer(&avfcontext->pb, og.header, og.header_len);
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put_buffer(&avfcontext->pb, og.body, og.body_len);
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put_flush_packet(&avfcontext->pb);
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while(ogg_stream_packetout(&context->os, op) != 1) {
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/* while no pages are available, read in more data to the sync */
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while(ogg_sync_pageout(&context->oy, &og) != 1) {
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buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
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if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
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ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
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/* got a page. Feed it into the stream and get the packet */
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if(ogg_stream_pagein(&context->os, &og) != 0)
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/* while no pages are available, read in more data to the sync */
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while(ogg_sync_pageout(&context->oy, &og) != 1) {
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buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
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if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
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ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
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/* got a page. Feed it into the stream and get the packet */
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if(ogg_stream_pagein(&context->os, &og) != 0)
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static int ogg_read_header(AVFormatContext *avfcontext, AVFormatParameters *ap)
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OggContext *context = avfcontext->priv_data;
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AVCodecContext *codec;
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ogg_sync_init(&context->oy) ;
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buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
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if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
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ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
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ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
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ogg_sync_pageout(&context->oy, &og) ;
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ogg_stream_init(&context->os, ogg_page_serialno(&og)) ;
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ogg_stream_pagein(&context->os, &og) ;
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/* currently only one vorbis stream supported */
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ast = av_new_stream(avfcontext, 0) ;
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return AVERROR_NOMEM ;
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ast->codec.codec_type = CODEC_TYPE_AUDIO ;
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ast->codec.codec_id = CODEC_ID_VORBIS ;
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return AVERROR_NOMEM ;
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av_set_pts_info(ast, 60, 1, AV_TIME_BASE);
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codec->codec_type = CODEC_TYPE_AUDIO;
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codec->codec_id = CODEC_ID_VORBIS;
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if(next_packet(avfcontext, &op)){
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if(op.bytes >= (1<<16) || op.bytes < 0)
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codec->extradata_size+= 2 + op.bytes;
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codec->extradata= av_realloc(codec->extradata, codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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memset(codec->extradata + codec->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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p= codec->extradata + codec->extradata_size - 2 - op.bytes;
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*(p++)= op.bytes&0xFF;
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memcpy(p, op.packet, op.bytes);