257 lines
6.5 KiB
C
257 lines
6.5 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 <ogg/ogg.h>
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#include "avformat.h"
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#undef NDEBUG
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#include <assert.h>
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#define DECODER_BUFFER_SIZE 4096
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typedef struct OggContext {
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/* output */
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ogg_stream_state os ;
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int header_handled ;
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ogg_packet op;
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/* input */
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ogg_sync_state oy ;
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} OggContext ;
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#ifdef CONFIG_ENCODERS
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static int ogg_write_header(AVFormatContext *avfcontext)
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{
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OggContext *context = avfcontext->priv_data;
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ogg_packet *op= &context->op;
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int n, i;
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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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AVCodecContext *codec = &avfcontext->streams[n]->codec;
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uint8_t *p= codec->extradata;
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av_set_pts_info(avfcontext->streams[n], 60, 1, AV_TIME_BASE);
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for(i=0; i < codec->extradata_size; i+= op->bytes){
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op->bytes = p[i++]<<8;
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op->bytes+= p[i++];
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op->packet= &p[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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}
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context->header_handled = 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, AVPacket *pkt)
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{
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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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ogg_page og ;
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int64_t pts;
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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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}
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context->header_handled = 1 ;
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}
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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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op->granulepos= pts;
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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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}
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op->packetno++;
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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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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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static 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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#endif //CONFIG_ENCODERS
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static int next_packet(AVFormatContext *avfcontext, ogg_packet *op) {
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OggContext *context = avfcontext->priv_data ;
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ogg_page og ;
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char *buf ;
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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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return 1 ;
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ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
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}
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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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return 1 ;
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}
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return 0 ;
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}
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static int ogg_read_header(AVFormatContext *avfcontext, AVFormatParameters *ap)
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{
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OggContext *context = avfcontext->priv_data;
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ogg_packet op ;
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char *buf ;
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ogg_page og ;
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AVStream *ast ;
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AVCodecContext *codec;
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uint8_t *p;
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int i;
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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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return AVERROR_IO ;
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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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if(!ast)
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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= &ast->codec;
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codec->codec_type = CODEC_TYPE_AUDIO;
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codec->codec_id = CODEC_ID_VORBIS;
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for(i=0; i<3; i++){
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if(next_packet(avfcontext, &op)){
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return -1;
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}
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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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p= codec->extradata + codec->extradata_size - 2 - op.bytes;
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*(p++)= op.bytes>>8;
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*(p++)= op.bytes&0xFF;
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memcpy(p, op.packet, op.bytes);
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}
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return 0 ;
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}
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static int ogg_read_packet(AVFormatContext *avfcontext, AVPacket *pkt) {
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ogg_packet op ;
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if(next_packet(avfcontext, &op))
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return AVERROR_IO ;
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if(av_new_packet(pkt, op.bytes) < 0)
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return AVERROR_IO ;
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pkt->stream_index = 0 ;
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memcpy(pkt->data, op.packet, op.bytes);
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if(avfcontext->streams[0]->codec.sample_rate && op.granulepos!=-1)
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pkt->pts= av_rescale(op.granulepos, AV_TIME_BASE, avfcontext->streams[0]->codec.sample_rate);
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// printf("%lld %d %d\n", pkt->pts, (int)op.granulepos, avfcontext->streams[0]->codec.sample_rate);
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return op.bytes;
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}
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static int ogg_read_close(AVFormatContext *avfcontext) {
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OggContext *context = avfcontext->priv_data ;
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ogg_stream_clear(&context->os) ;
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ogg_sync_clear(&context->oy) ;
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av_freep(&avfcontext->streams[0]->codec.extradata);
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return 0 ;
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}
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static AVInputFormat ogg_iformat = {
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"ogg",
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"Ogg Vorbis",
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sizeof(OggContext),
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NULL,
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ogg_read_header,
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ogg_read_packet,
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ogg_read_close,
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.extensions = "ogg",
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} ;
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int ogg_init(void) {
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#ifdef CONFIG_ENCODERS
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av_register_output_format(&ogg_oformat) ;
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#endif
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av_register_input_format(&ogg_iformat);
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return 0 ;
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}
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