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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "ad_internal.h"
#ifdef HAVE_OGGVORBIS
static ad_info_t info =
{
"Ogg/Vorbis audio decoder",
"libvorbis",
"Felix Buenemann, A'rpi",
"libvorbis",
""
};
LIBAD_EXTERN(libvorbis)
#include <vorbis/codec.h>
// This struct is also defined in demux_ogg.c => common header ?
typedef struct ov_struct_st {
vorbis_info vi; /* struct that stores all the static vorbis bitstream
settings */
vorbis_comment vc; /* struct that stores all the bitstream user comments */
vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
vorbis_block vb; /* local working space for packet->PCM decode */
} ov_struct_t;
static int preinit(sh_audio_t *sh)
{
sh->audio_out_minsize=1024*4; // 1024 samples/frame
return 1;
}
static int init(sh_audio_t *sh)
{
ogg_packet op;
vorbis_comment vc;
struct ov_struct_st *ov;
#define ERROR() { \
vorbis_comment_clear(&vc); \
vorbis_info_clear(&ov->vi); \
free(ov); \
return 0; \
}
/// Init the decoder with the 3 header packets
ov = (struct ov_struct_st*)malloc(sizeof(struct ov_struct_st));
vorbis_info_init(&ov->vi);
vorbis_comment_init(&vc);
op.bytes = ds_get_packet(sh->ds,&op.packet);
op.b_o_s = 1;
/// Header
if(vorbis_synthesis_headerin(&ov->vi,&vc,&op) <0) {
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"OggVorbis: initial (identification) header broken!\n");
ERROR();
}
op.bytes = ds_get_packet(sh->ds,&op.packet);
op.b_o_s = 0;
/// Comments
if(vorbis_synthesis_headerin(&ov->vi,&vc,&op) <0) {
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"OggVorbis: comment header broken!\n");
ERROR();
}
op.bytes = ds_get_packet(sh->ds,&op.packet);
//// Codebook
if(vorbis_synthesis_headerin(&ov->vi,&vc,&op)<0) {
mp_msg(MSGT_DECAUDIO,MSGL_WARN,"OggVorbis: codebook header broken!\n");
ERROR();
} else { /// Print the infos
char **ptr=vc.user_comments;
while(*ptr){
mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbisComment: %s\n",*ptr);
++ptr;
}
mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbis: Bitstream is %d channel, %dHz, %dbit/s %cBR\n",(int)ov->vi.channels,(int)ov->vi.rate,(int)ov->vi.bitrate_nominal,
(ov->vi.bitrate_lower!=ov->vi.bitrate_nominal)||(ov->vi.bitrate_upper!=ov->vi.bitrate_nominal)?'V':'C');
mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbis: Encoded by: %s\n",vc.vendor);
}
vorbis_comment_clear(&vc);
// printf("lower=%d upper=%d \n",(int)ov->vi.bitrate_lower,(int)ov->vi.bitrate_upper);
// Setup the decoder
sh->channels=ov->vi.channels;
sh->samplerate=ov->vi.rate;
// assume 128kbit if bitrate not specified in the header
sh->i_bps=((ov->vi.bitrate_nominal>0) ? ov->vi.bitrate_nominal : 128000)/8;
sh->context = ov;
/// Finish the decoder init
vorbis_synthesis_init(&ov->vd,&ov->vi);
vorbis_block_init(&ov->vd,&ov->vb);
mp_msg(MSGT_DECAUDIO,MSGL_V,"OggVorbis: Init OK!\n");
return 1;
}
static void uninit(sh_audio_t *sh)
{
struct ov_struct_st *ov = sh->context;
vorbis_block_clear(&ov->vb);
vorbis_info_clear(&ov->vi);
free(ov);
}
static int control(sh_audio_t *sh,int cmd,void* arg, ...)
{
switch(cmd)
{
#if 0
case ADCTRL_RESYNC_STREAM:
return CONTROL_TRUE;
case ADCTRL_SKIP_FRAME:
return CONTROL_TRUE;
#endif
}
return CONTROL_UNKNOWN;
}
static int decode_audio(sh_audio_t *sh,unsigned char *buf,int minlen,int maxlen)
{
int len = 0;
int samples;
float **pcm;
ogg_packet op;
struct ov_struct_st *ov = sh->context;
op.b_o_s = op.e_o_s = 0;
while(len < minlen) {
op.bytes = ds_get_packet(sh->ds,&op.packet);
if(!op.packet)
break;
if(vorbis_synthesis(&ov->vb,&op)==0) /* test for success! */
vorbis_synthesis_blockin(&ov->vd,&ov->vb);
while((samples=vorbis_synthesis_pcmout(&ov->vd,&pcm))>0){
int i,j;
int clipflag=0;
int convsize=(maxlen-len)/(2*ov->vi.channels); // max size!
int bout=(samples<convsize?samples:convsize);
if(bout<=0) break;
/* convert floats to 16 bit signed ints (host order) and
interleave */
for(i=0;i<ov->vi.channels;i++){
ogg_int16_t *convbuffer=(ogg_int16_t *)(&buf[len]);
ogg_int16_t *ptr=convbuffer+i;
float *mono=pcm[i];
for(j=0;j<bout;j++){
#if 1
int val=mono[j]*32767.f;
#else /* optional dither */
int val=mono[j]*32767.f+drand48()-0.5f;
#endif
/* might as well guard against clipping */
if(val>32767){
val=32767;
clipflag=1;
}
if(val<-32768){
val=-32768;
clipflag=1;
}
*ptr=val;
ptr+=ov->vi.channels;
}
}
if(clipflag)
mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"Clipping in frame %ld\n",(long)(ov->vd.sequence));
len+=2*ov->vi.channels*bout;
mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"\n[decoded: %d / %d ]\n",bout,samples);
vorbis_synthesis_read(&ov->vd,bout); /* tell libvorbis how
many samples we
actually consumed */
}
}
return len;
}
#endif /* !HAVE_OGGVORBIS */
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