+++ /dev/null
-/*
- * Ogg bitstream support
- * Mark Hills <mark@pogo.org.uk>
- *
- * Uses libogg, but requires libvorbisenc to construct correct headers
- * when containing Vorbis stream -- currently the only format supported
- */
-
-#include <stdio.h>
-#include <time.h>
-
-#include <ogg/ogg.h>
-#include <vorbis/vorbisenc.h>
-
-#include "avformat.h"
-#include "oggvorbis.h"
-
-#define DECODER_BUFFER_SIZE 4096
-
-
-typedef struct OggContext {
- /* output */
- ogg_stream_state os ;
- int header_handled ;
- ogg_int64_t base_packet_no ;
- ogg_int64_t base_granule_pos ;
-
- /* input */
- ogg_sync_state oy ;
-} OggContext ;
-
-
-static int ogg_write_header(AVFormatContext *avfcontext)
-{
- OggContext *context = avfcontext->priv_data;
- AVCodecContext *avccontext ;
- vorbis_info vi ;
- vorbis_dsp_state vd ;
- vorbis_comment vc ;
- vorbis_block vb ;
- ogg_packet header, header_comm, header_code ;
- int n ;
-
- srand(time(NULL));
- ogg_stream_init(&context->os, rand());
-
- for(n = 0 ; n < avfcontext->nb_streams ; n++) {
- avccontext = &avfcontext->streams[n]->codec ;
-
- /* begin vorbis specific code */
-
- vorbis_info_init(&vi) ;
-
- /* code copied from libavcodec/oggvorbis.c */
-
- if(oggvorbis_init_encoder(&vi, avccontext) < 0) {
- fprintf(stderr, "ogg_write_header: init_encoder failed") ;
- return -1 ;
- }
-
- vorbis_analysis_init(&vd, &vi) ;
- vorbis_block_init(&vd, &vb) ;
-
- vorbis_comment_init(&vc) ;
- vorbis_comment_add_tag(&vc, "encoder", "ffmpeg") ;
- if(*avfcontext->title)
- vorbis_comment_add_tag(&vc, "title", avfcontext->title) ;
-
- vorbis_analysis_headerout(&vd, &vc, &header,
- &header_comm, &header_code) ;
- ogg_stream_packetin(&context->os, &header) ;
- ogg_stream_packetin(&context->os, &header_comm) ;
- ogg_stream_packetin(&context->os, &header_code) ;
-
- vorbis_block_clear(&vb) ;
- vorbis_dsp_clear(&vd) ;
- vorbis_info_clear(&vi) ;
- vorbis_comment_clear(&vc) ;
-
- /* end of vorbis specific code */
-
- context->header_handled = 0 ;
- context->base_packet_no = 0 ;
- }
-
- return 0 ;
-}
-
-
-static int ogg_write_packet(AVFormatContext *avfcontext,
- int stream_index,
- unsigned char *buf, int size, int force_pts)
-{
- OggContext *context = avfcontext->priv_data ;
- ogg_packet *op ;
- ogg_page og ;
- int l = 0 ;
-
- /* flush header packets so audio starts on a new page */
-
- if(!context->header_handled) {
- while(ogg_stream_flush(&context->os, &og)) {
- put_buffer(&avfcontext->pb, og.header, og.header_len) ;
- put_buffer(&avfcontext->pb, og.body, og.body_len) ;
- put_flush_packet(&avfcontext->pb);
- }
- context->header_handled = 1 ;
- }
-
- while(l < size) {
- op = (ogg_packet*)(buf + l) ;
- op->packet = buf + l + sizeof(ogg_packet) ; /* fix data pointer */
-
- if(!context->base_packet_no) { /* this is the first packet */
- context->base_packet_no = op->packetno ;
- context->base_granule_pos = op->granulepos ;
- }
-
- /* correct the fields in the packet -- essential for streaming */
-
- op->packetno -= context->base_packet_no ;
- op->granulepos -= context->base_granule_pos ;
-
- ogg_stream_packetin(&context->os, op) ;
- l += sizeof(ogg_packet) + op->bytes ;
-
- while(ogg_stream_pageout(&context->os, &og)) {
- put_buffer(&avfcontext->pb, og.header, og.header_len) ;
- put_buffer(&avfcontext->pb, og.body, og.body_len) ;
- put_flush_packet(&avfcontext->pb);
- }
- }
-
- return 0;
-}
-
-
-static int ogg_write_trailer(AVFormatContext *avfcontext) {
- OggContext *context = avfcontext->priv_data ;
- ogg_page og ;
-
- while(ogg_stream_flush(&context->os, &og)) {
- put_buffer(&avfcontext->pb, og.header, og.header_len) ;
- put_buffer(&avfcontext->pb, og.body, og.body_len) ;
- put_flush_packet(&avfcontext->pb);
- }
-
- ogg_stream_clear(&context->os) ;
- return 0 ;
-}
-
-
-static AVOutputFormat ogg_oformat = {
- "ogg",
- "Ogg Vorbis",
- "audio/x-vorbis",
- "ogg",
- sizeof(OggContext),
- CODEC_ID_VORBIS,
- 0,
- ogg_write_header,
- ogg_write_packet,
- ogg_write_trailer,
-} ;
-
-
-static int next_packet(AVFormatContext *avfcontext, ogg_packet *op) {
- OggContext *context = avfcontext->priv_data ;
- ogg_page og ;
- char *buf ;
-
- while(ogg_stream_packetout(&context->os, op) != 1) {
-
- /* while no pages are available, read in more data to the sync */
- while(ogg_sync_pageout(&context->oy, &og) != 1) {
- buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
- if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
- return 1 ;
- ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
- }
-
- /* got a page. Feed it into the stream and get the packet */
- if(ogg_stream_pagein(&context->os, &og) != 0)
- return 1 ;
- }
-
- return 0 ;
-}
-
-
-static int ogg_read_header(AVFormatContext *avfcontext, AVFormatParameters *ap)
-{
- OggContext *context = avfcontext->priv_data;
- char *buf ;
- ogg_page og ;
- AVStream *ast ;
-
- ogg_sync_init(&context->oy) ;
- buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
-
- if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
- return -EIO ;
-
- ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
- ogg_sync_pageout(&context->oy, &og) ;
- ogg_stream_init(&context->os, ogg_page_serialno(&og)) ;
- ogg_stream_pagein(&context->os, &og) ;
-
- /* currently only one vorbis stream supported */
-
- ast = av_new_stream(avfcontext, 0) ;
- if(!ast)
- return AVERROR_NOMEM ;
-
- ast->codec.codec_type = CODEC_TYPE_AUDIO ;
- ast->codec.codec_id = CODEC_ID_VORBIS ;
-
- return 0 ;
-}
-
-
-static int ogg_read_packet(AVFormatContext *avfcontext, AVPacket *pkt) {
- ogg_packet op ;
-
- if(next_packet(avfcontext, &op))
- return -EIO ;
- if(av_new_packet(pkt, sizeof(ogg_packet) + op.bytes) < 0)
- return -EIO ;
- pkt->stream_index = 0 ;
- memcpy(pkt->data, &op, sizeof(ogg_packet)) ;
- memcpy(pkt->data + sizeof(ogg_packet), op.packet, op.bytes) ;
-
- return sizeof(ogg_packet) + op.bytes ;
-}
-
-
-static int ogg_read_close(AVFormatContext *avfcontext) {
- OggContext *context = avfcontext->priv_data ;
-
- ogg_stream_clear(&context->os) ;
- ogg_sync_clear(&context->oy) ;
-
- return 0 ;
-}
-
-
-static AVInputFormat ogg_iformat = {
- "ogg",
- "Ogg Vorbis",
- sizeof(OggContext),
- NULL,
- ogg_read_header,
- ogg_read_packet,
- ogg_read_close,
- .extensions = "ogg",
-} ;
-
-
-int ogg_init(void) {
- av_register_output_format(&ogg_oformat) ;
- av_register_input_format(&ogg_iformat);
- return 0 ;
-}
projects / synfig.git / blobdiff