169 lines
4.0 KiB
C
169 lines
4.0 KiB
C
/*
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* Ogg bitstream support
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* Mark Hills <mark@pogo.org.uk>
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*
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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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*/
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#include <stdio.h>
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#include <time.h>
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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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typedef struct OggContext {
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ogg_stream_state os ;
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int header_written ;
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ogg_int64_t base_packet_no ;
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ogg_int64_t base_granule_pos ;
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} OggContext ;
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static int ogg_write_header(AVFormatContext *avfcontext) {
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OggContext *context ;
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AVCodecContext *avccontext ;
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vorbis_info vi ;
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vorbis_dsp_state vd ;
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vorbis_comment vc ;
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vorbis_block vb ;
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ogg_packet header, header_comm, header_code ;
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int n ;
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fprintf(stderr, "ogg_write_header\n") ;
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if(!(context = malloc(sizeof(OggContext))))
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return -1 ;
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avfcontext->priv_data = context ;
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srand(time(NULL));
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ogg_stream_init(&context->os, rand());
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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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return -1 ;
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}
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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_comment_clear(&vc) ;
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/* end of vorbis specific code */
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context->header_written = 0 ;
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context->base_packet_no = 0 ;
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}
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return 0 ;
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}
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static int ogg_write_packet(AVFormatContext *avfcontext,
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int stream_index,
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unsigned char *buf, int size, int force_pts)
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{
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OggContext *context = avfcontext->priv_data ;
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ogg_packet *op ;
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ogg_page og ;
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int l = 0 ;
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/* flush header packets so audio starts on a new page */
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if(!context->header_written) {
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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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}
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context->header_written = 1 ;
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}
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while(l < size) {
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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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}
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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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}
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}
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return 0;
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}
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static int ogg_write_trailer(AVFormatContext *avfcontext) {
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OggContext *context = avfcontext->priv_data ;
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ogg_page og ;
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fprintf(stderr, "ogg_write_trailer\n") ;
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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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}
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ogg_stream_clear(&context->os) ;
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return 0 ;
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}
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AVOutputFormat ogg_oformat = {
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"ogg",
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"Ogg Vorbis",
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"audio/x-vorbis",
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"ogg",
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sizeof(OggContext),
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CODEC_ID_VORBIS,
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0,
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ogg_write_header,
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ogg_write_packet,
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ogg_write_trailer,
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};
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int ogg_init(void) {
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av_register_output_format(&ogg_oformat) ;
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return 0 ;
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}
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