mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
260 lines
6.6 KiB
C
260 lines
6.6 KiB
C
/*
|
|
* 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 <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_ENCODERS
|
|
static int ogg_write_header(AVFormatContext *avfcontext)
|
|
{
|
|
OggContext *context = avfcontext->priv_data;
|
|
ogg_packet *op= &context->op;
|
|
int n, i;
|
|
|
|
av_set_pts_info(avfcontext, 60, 1, AV_TIME_BASE);
|
|
|
|
ogg_stream_init(&context->os, 31415);
|
|
|
|
for(n = 0 ; n < avfcontext->nb_streams ; n++) {
|
|
AVCodecContext *codec = &avfcontext->streams[n]->codec;
|
|
uint8_t *p= codec->extradata;
|
|
|
|
for(i=0; i < codec->extradata_size; i+= op->bytes){
|
|
op->bytes = p[i++]<<8;
|
|
op->bytes+= p[i++];
|
|
|
|
op->packet= &p[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,
|
|
int stream_index,
|
|
const uint8_t *buf, int size, int64_t pts)
|
|
{
|
|
OggContext *context = avfcontext->priv_data ;
|
|
AVCodecContext *avctx= &avfcontext->streams[stream_index]->codec;
|
|
ogg_packet *op= &context->op;
|
|
ogg_page og ;
|
|
|
|
pts= av_rescale(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*) buf;
|
|
op->bytes = 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 ;
|
|
}
|
|
|
|
|
|
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,
|
|
} ;
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
|
|
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;
|
|
|
|
avfcontext->ctx_flags |= AVFMTCTX_NOHEADER;
|
|
av_set_pts_info(avfcontext, 60, 1, AV_TIME_BASE);
|
|
|
|
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 ;
|
|
|
|
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;
|
|
}
|
|
codec->extradata_size+= 2 + op.bytes;
|
|
codec->extradata= av_realloc(codec->extradata, codec->extradata_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 -EIO ;
|
|
if(av_new_packet(pkt, op.bytes) < 0)
|
|
return -EIO ;
|
|
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("%lld %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) ;
|
|
av_freep(&avfcontext->streams[0]->codec.extradata);
|
|
|
|
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) {
|
|
#ifdef CONFIG_ENCODERS
|
|
av_register_output_format(&ogg_oformat) ;
|
|
#endif
|
|
av_register_input_format(&ogg_iformat);
|
|
return 0 ;
|
|
}
|