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// SAMPLE audio decoder - you can use this file as template when creating new codec!
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "ad_internal.h"
static ad_info_t info = {
"RealAudio 1.0 and 2.0 native decoder",
"ra1428",
"Roberto Togni",
"http://www.honeypot.net/audio",
"Decoders taken from a public domain Amiga player"
};
LIBAD_EXTERN(ra1428)
#include "native/common1428.h"
static int preinit(sh_audio_t *sh) {
sh->samplerate=sh->wf->nSamplesPerSec;
sh->samplesize=sh->wf->wBitsPerSample/8;
sh->channels=sh->wf->nChannels;
sh->sample_format=AF_FORMAT_S16_LE;
switch (sh->format) {
case mmioFOURCC('1','4','_','4'):
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"[ra1428] RealAudio 1.0 (14_4)\n");
sh->i_bps=1800;
break;
case mmioFOURCC('2','8','_','8'):
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"[ra1428] RealAudio 2.0 (28_8)\n");
sh->i_bps=1200;
break;
default:
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"[ra1428] Unhandled format in preinit: %x\n", sh->format);
return 0;
}
sh->audio_out_minsize=128000; // no idea how to get... :(
sh->audio_in_minsize=((short*)(sh->wf+1))[1]*sh->wf->nBlockAlign;
return 1; // return values: 1=OK 0=ERROR
}
static int init(sh_audio_t *sh) {
switch (sh->format) {
case mmioFOURCC('1','4','_','4'):
sh->context = init_144();
break;
case mmioFOURCC('2','8','_','8'):
sh->context = init_288();
break;
default:
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"[ra1428] Unhandled format in init: %x\n", sh->format);
return 0;
}
return 1; // return values: 1=OK 0=ERROR
}
static void uninit(sh_audio_t *sh) {
switch (sh->format) {
case mmioFOURCC('1','4','_','4'):
free_144((Real_144*)sh->context);
break;
case mmioFOURCC('2','8','_','8'):
free_288((Real_288*)sh->context);
break;
default:
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"[ra1428] Unhandled format in uninit: %x\n", sh->format);
return;
}
}
static int decode_audio(sh_audio_t *sh,unsigned char *buf,int minlen,int maxlen) {
int w=sh->wf->nBlockAlign;
int h=((short*)(sh->wf+1))[1];
int cfs=((short*)(sh->wf+1))[3];
int i,j;
if(sh->a_in_buffer_len<=0){
switch (sh->format) {
case mmioFOURCC('1','4','_','4'):
demux_read_data(sh->ds, sh->a_in_buffer, sh->wf->nBlockAlign);
sh->a_in_buffer_size=
sh->a_in_buffer_len=sh->wf->nBlockAlign;
break;
case mmioFOURCC('2','8','_','8'):
for (j = 0; j < h; j++)
for (i = 0; i < h/2; i++)
demux_read_data(sh->ds, sh->a_in_buffer+i*2*w+j*cfs, cfs);
sh->a_in_buffer_size=
sh->a_in_buffer_len=sh->wf->nBlockAlign*h;
break;
default:
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"[ra1428] Unhandled format in decode_audio: %x\n", sh->format);
return 0;
}
}
switch (sh->format) {
case mmioFOURCC('1','4','_','4'):
decode_144((Real_144*)sh->context,sh->a_in_buffer+sh->a_in_buffer_size-sh->a_in_buffer_len,(signed short*)buf);
break;
case mmioFOURCC('2','8','_','8'):
decode_288((Real_288*)sh->context,sh->a_in_buffer+sh->a_in_buffer_size-sh->a_in_buffer_len,(signed short*)buf);
break;
default:
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"[ra1428] Unhandled format in init: %x\n", sh->format);
return 0;
}
sh->a_in_buffer_len-=cfs;
return AUDIOBLOCK*2; // return value: number of _bytes_ written to output buffer,
// or -1 for EOF (or uncorrectable error)
}
static int control(sh_audio_t *sh,int cmd,void* arg, ...){
// various optional functions you MAY implement:
switch(cmd){
case ADCTRL_RESYNC_STREAM:
// it is called once after seeking, to resync.
// Note: sh_audio->a_in_buffer_len=0; is done _before_ this call!
// ...
return CONTROL_TRUE;
case ADCTRL_SKIP_FRAME:
// it is called to skip (jump over) small amount (1/10 sec or 1 frame)
// of audio data - used to sync audio to video after seeking
// if you don't return CONTROL_TRUE, it will defaults to:
// ds_fill_buffer(sh_audio->ds); // skip 1 demux packet
// ...
return CONTROL_TRUE;
}
return CONTROL_UNKNOWN;
}
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