mirror of
https://github.com/FFmpeg/FFmpeg.git
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264 lines
6.3 KiB
C
264 lines
6.3 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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#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_int64_t base_packet_no ;
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ogg_int64_t base_granule_pos ;
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/* input */
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ogg_sync_state oy ;
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} OggContext ;
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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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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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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_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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}
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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_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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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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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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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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char *buf ;
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ogg_page og ;
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AVStream *ast ;
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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 -EIO ;
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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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ast->codec.codec_type = CODEC_TYPE_AUDIO ;
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ast->codec.codec_id = CODEC_ID_VORBIS ;
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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 -EIO ;
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if(av_new_packet(pkt, sizeof(ogg_packet) + op.bytes) < 0)
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return -EIO ;
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pkt->stream_index = 0 ;
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memcpy(pkt->data, &op, sizeof(ogg_packet)) ;
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memcpy(pkt->data + sizeof(ogg_packet), op.packet, op.bytes) ;
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return sizeof(ogg_packet) + 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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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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av_register_output_format(&ogg_oformat) ;
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av_register_input_format(&ogg_iformat);
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return 0 ;
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}
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