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/*
* Ogg Vorbis codec support via libvorbisenc
* Mark Hills <mark@pogo.org.uk>
*/
#include <time.h>
#include <vorbis/vorbisenc.h>
#include "avcodec.h"
#include "oggvorbis.h"
#define OGGVORBIS_FRAME_SIZE 1024
typedef struct OggVorbisContext {
vorbis_info vi ;
vorbis_dsp_state vd ;
vorbis_block vb ;
} OggVorbisContext ;
int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
if(avccontext->quality) { /* VBR requested */
fprintf(stderr, "init_encode: channels=%d quality=%d\n",
avccontext->channels, avccontext->quality) ;
return vorbis_encode_init_vbr(vi, avccontext->channels,
avccontext->sample_rate, (float)avccontext->quality / 1000) ;
}
fprintf(stderr, "init_encoder: channels=%d bitrate=%d tolerance=%d\n",
avccontext->channels, avccontext->bit_rate,
avccontext->bit_rate_tolerance) ;
return vorbis_encode_init(vi, avccontext->channels,
avccontext->sample_rate, -1, avccontext->bit_rate, -1) ;
}
static int oggvorbis_encode_init(AVCodecContext *avccontext) {
OggVorbisContext *context = avccontext->priv_data ;
fprintf(stderr, "oggvorbis_encode_init\n") ;
vorbis_info_init(&context->vi) ;
if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
fprintf(stderr, "oggvorbis_encode_init: init_encoder failed") ;
return -1 ;
}
vorbis_analysis_init(&context->vd, &context->vi) ;
vorbis_block_init(&context->vd, &context->vb) ;
avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
return 0 ;
}
int oggvorbis_encode_frame(AVCodecContext *avccontext, unsigned char *packets,
int buf_size, void *data)
{
OggVorbisContext *context = avccontext->priv_data ;
float **buffer ;
ogg_packet op ;
signed char *audio = data ;
int l, samples = buf_size / 16 ; /* samples = OGGVORBIS_FRAME_SIZE */ ;
buffer = vorbis_analysis_buffer(&context->vd, samples) ;
if(context->vi.channels == 1) {
for(l = 0 ; l < samples ; l++)
buffer[0][l]=((audio[l*2+1]<<8)|(0x00ff&(int)audio[l*2]))/32768.f;
} else {
for(l = 0 ; l < samples ; l++){
buffer[0][l]=((audio[l*4+1]<<8)|(0x00ff&(int)audio[l*4]))/32768.f;
buffer[1][l]=((audio[l*4+3]<<8)|(0x00ff&(int)audio[l*4+2]))/32768.f;
}
}
vorbis_analysis_wrote(&context->vd, samples) ;
l = 0 ;
while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
vorbis_analysis(&context->vb, NULL);
vorbis_bitrate_addblock(&context->vb) ;
while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
memcpy(packets + l, &op, sizeof(ogg_packet)) ;
memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
l += sizeof(ogg_packet) + op.bytes ;
}
}
return l ;
}
int oggvorbis_encode_close(AVCodecContext *avccontext) {
OggVorbisContext *context = avccontext->priv_data ;
/* ogg_packet op ; */
fprintf(stderr, "oggvorbis_encode_close\n") ;
vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
/* We need to write all the remaining packets into the stream
* on closing */
/*
while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
memcpy(packets + l, &op, sizeof(ogg_packet)) ;
memcpy(packets + l + sizeof(ogg_packet), op.packet, op.bytes) ;
l += sizeof(ogg_packet) + op.bytes ;
}
*/
vorbis_block_clear(&context->vb);
vorbis_dsp_clear(&context->vd);
vorbis_info_clear(&context->vi);
return 0 ;
}
AVCodec oggvorbis_encoder = {
"vorbis",
CODEC_TYPE_AUDIO,
CODEC_ID_VORBIS,
sizeof(OggVorbisContext),
oggvorbis_encode_init,
oggvorbis_encode_frame,
oggvorbis_encode_close
};
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