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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 ;
/* decoder */
vorbis_comment vc ;
} OggVorbisContext ;
int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
if(avccontext->quality) /* VBR requested */
return vorbis_encode_init_vbr(vi, avccontext->channels,
avccontext->sample_rate, (float)avccontext->quality / 1000) ;
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 ;
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 ;
}
static 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 = 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 ;
}
static int oggvorbis_encode_close(AVCodecContext *avccontext) {
OggVorbisContext *context = avccontext->priv_data ;
/* ogg_packet op ; */
vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
/* We need to write all the remaining packets into the stream
* on closing */
fprintf(stderr, "fixme: not all packets written on oggvorbis_encode_close()\n") ;
/*
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
} ;
static int oggvorbis_decode_init(AVCodecContext *avccontext) {
OggVorbisContext *context = avccontext->priv_data ;
vorbis_info_init(&context->vi) ;
vorbis_comment_init(&context->vc) ;
return 0 ;
}
static inline int conv(int samples, float **pcm, char *buf, int channels) {
int i, j, val ;
ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
float *mono ;
for(i = 0 ; i < channels ; i++){
ptr = &data[i];
mono = pcm[i] ;
for(j = 0 ; j < samples ; j++) {
val = mono[j] * 32767.f;
if(val > 32767) val = 32767 ;
if(val < -32768) val = -32768 ;
*ptr = val ;
ptr += channels;
}
}
return 0 ;
}
static int oggvorbis_decode_frame(AVCodecContext *avccontext,
void *data, int *data_size,
UINT8 *buf, int buf_size)
{
OggVorbisContext *context = avccontext->priv_data ;
ogg_packet *op = (ogg_packet*)buf ;
float **pcm ;
int samples, total_samples, total_bytes ;
op->packet = (char*)op + sizeof(ogg_packet) ; /* correct data pointer */
if(op->packetno < 3) {
vorbis_synthesis_headerin(&context->vi, &context->vc, op) ;
return buf_size ;
}
if(op->packetno == 3) {
fprintf(stderr, "vorbis_decode: %d channel, %ldHz, encoder `%s'\n",
context->vi.channels, context->vi.rate, context->vc.vendor);
avccontext->channels = context->vi.channels ;
avccontext->sample_rate = context->vi.rate ;
vorbis_synthesis_init(&context->vd, &context->vi) ;
vorbis_block_init(&context->vd, &context->vb);
}
if(vorbis_synthesis(&context->vb, op) == 0)
vorbis_synthesis_blockin(&context->vd, &context->vb) ;
total_samples = 0 ;
total_bytes = 0 ;
while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
conv(samples, pcm, (char*)data + total_bytes, context->vi.channels) ;
total_bytes += samples * 2 * context->vi.channels ;
total_samples += samples ;
vorbis_synthesis_read(&context->vd, samples) ;
}
*data_size = total_bytes ;
return buf_size ;
}
static int oggvorbis_decode_close(AVCodecContext *avccontext) {
OggVorbisContext *context = avccontext->priv_data ;
vorbis_info_clear(&context->vi) ;
vorbis_comment_clear(&context->vc) ;
return 0 ;
}
AVCodec oggvorbis_decoder = {
"vorbis",
CODEC_TYPE_AUDIO,
CODEC_ID_VORBIS,
sizeof(OggVorbisContext),
oggvorbis_decode_init,
NULL,
oggvorbis_decode_close,
oggvorbis_decode_frame,
} ;
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