ffmpeg/libavformat/ogg.c

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/*
* 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
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <ogg/ogg.h>
#include "avformat.h"
#undef NDEBUG
#include <assert.h>
#define DECODER_BUFFER_SIZE 4096
typedef struct OggContext {
/* output */
ogg_stream_state os ;
int header_handled ;
ogg_packet op;
/* input */
ogg_sync_state oy ;
} OggContext ;
#ifdef CONFIG_MUXERS
static int ogg_write_header(AVFormatContext *avfcontext)
{
OggContext *context = avfcontext->priv_data;
ogg_packet *op= &context->op;
int n;
ogg_stream_init(&context->os, 31415);
for(n = 0 ; n < avfcontext->nb_streams ; n++) {
AVCodecContext *codec = avfcontext->streams[n]->codec;
uint8_t *headers = codec->extradata;
int headers_len = codec->extradata_size;
uint8_t *header_start[3];
int header_len[3];
int i, j;
av_set_pts_info(avfcontext->streams[n], 60, 1, AV_TIME_BASE);
for(j=1,i=0;i<2;++i, ++j) {
header_len[i]=0;
while(j<headers_len && headers[j]==0xff) {
header_len[i]+=0xff;
++j;
}
header_len[i]+=headers[j];
}
header_len[2]=headers_len-header_len[0]-header_len[1]-j;
headers+=j;
header_start[0] = headers;
header_start[1] = header_start[0] + header_len[0];
header_start[2] = header_start[1] + header_len[1];
for(i=0; i < 3; ++i){
op->bytes = header_len[i];
op->packet= header_start[i];
op->b_o_s= op->packetno==0;
ogg_stream_packetin(&context->os, op);
op->packetno++; //FIXME multiple streams
}
context->header_handled = 0 ;
}
return 0 ;
}
static int ogg_write_packet(AVFormatContext *avfcontext, AVPacket *pkt)
{
OggContext *context = avfcontext->priv_data ;
AVCodecContext *avctx= avfcontext->streams[pkt->stream_index]->codec;
ogg_packet *op= &context->op;
ogg_page og ;
int64_t pts;
pts= av_rescale(pkt->pts, avctx->sample_rate, AV_TIME_BASE);
// av_log(avfcontext, AV_LOG_DEBUG, "M%d\n", size);
/* 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 ;
}
op->packet = (uint8_t*) pkt->data;
op->bytes = pkt->size;
op->b_o_s = op->packetno == 0;
op->granulepos= pts;
/* correct the fields in the packet -- essential for streaming */
ogg_stream_packetin(&context->os, op);
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);
}
op->packetno++;
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 ;
}
AVOutputFormat ogg_muxer = {
"ogg",
"Ogg format",
"application/ogg",
"ogg",
sizeof(OggContext),
CODEC_ID_VORBIS,
0,
ogg_write_header,
ogg_write_packet,
ogg_write_trailer,
} ;
#endif //CONFIG_MUXERS
#if 0
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;
ogg_packet op ;
char *buf ;
ogg_page og ;
AVStream *ast ;
AVCodecContext *codec;
uint8_t *p;
int i;
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 AVERROR_IO ;
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 ;
av_set_pts_info(ast, 60, 1, AV_TIME_BASE);
codec= &ast->codec;
codec->codec_type = CODEC_TYPE_AUDIO;
codec->codec_id = CODEC_ID_VORBIS;
for(i=0; i<3; i++){
if(next_packet(avfcontext, &op)){
return -1;
}
if(op.bytes >= (1<<16) || op.bytes < 0)
return -1;
codec->extradata_size+= 2 + op.bytes;
codec->extradata= av_realloc(codec->extradata, codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
memset(codec->extradata + codec->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
p= codec->extradata + codec->extradata_size - 2 - op.bytes;
*(p++)= op.bytes>>8;
*(p++)= op.bytes&0xFF;
memcpy(p, op.packet, op.bytes);
}
return 0 ;
}
static int ogg_read_packet(AVFormatContext *avfcontext, AVPacket *pkt) {
ogg_packet op ;
if(next_packet(avfcontext, &op))
return AVERROR_IO ;
if(av_new_packet(pkt, op.bytes) < 0)
return AVERROR_IO ;
pkt->stream_index = 0 ;
memcpy(pkt->data, op.packet, op.bytes);
if(avfcontext->streams[0]->codec.sample_rate && op.granulepos!=-1)
pkt->pts= av_rescale(op.granulepos, AV_TIME_BASE, avfcontext->streams[0]->codec.sample_rate);
// printf("%"PRId64" %d %d\n", pkt->pts, (int)op.granulepos, avfcontext->streams[0]->codec.sample_rate);
return 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",
} ;
#endif