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|
/* This audio output plugin changes the format of a data block. Valid
output formats are: AFMT_U8, AFMT_S8, AFMT_S16_LE, AFMT_S16_BE
AFMT_U16_LE, AFMT_U16_BE, AFMT_S32_LE and AFMT_S32_BE. The output
format is spedified using the cfg switch 'format=NR' where NR is
the number as given in libao2/afmt.h
*/
#define PLUGIN
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include "audio_out.h"
#include "audio_plugin.h"
#include "audio_plugin_internal.h"
#include "afmt.h"
static ao_info_t info =
{
"Sample format conversion audio plugin",
"format",
"Anders",
""
};
LIBAO_PLUGIN_EXTERN(format)
// local data
typedef struct pl_format_s
{
void* data; // local audio data block
int len; // local buffer length
int in; // input fomat
int out; // output fomat
double sz_mult; // data size multiplier
} pl_format_t;
static pl_format_t pl_format={NULL,0,0,0,1};
// Number of bits
#define B08 (0<<0)
#define B16 (1<<0)
#define B32 (2<<0)
#define NBITS_MASK (3<<0)
// Endianess
#define BE (0<<2) // Big Endian
#define LE (1<<2) // Little Endian
#define END_MASK (1<<2)
// Signed
#define US (0<<3) // Un Signed
#define SI (1<<3) // SIgned
#define SIGN_MASK (1<<3)
// to set/get/query special features/parameters
static int control(int cmd,void *arg){
switch(cmd){
case AOCONTROL_PLUGIN_SET_LEN:
if(pl_format.data)
free(pl_format.data);
pl_format.len = ao_plugin_data.len;
pl_format.data=(void*)malloc(ao_plugin_data.len);
if(!pl_format.data)
return CONTROL_ERROR;
ao_plugin_data.len=(int)(((double)ao_plugin_data.len)/pl_format.sz_mult);
return CONTROL_OK;
}
return -1;
}
// open & setup audio device
// return: 1=success 0=fail
static int init(){
// Sheck input format
switch(ao_plugin_data.format){
case(AFMT_U8):
pl_format.in=LE|B08|US; break;
case(AFMT_S8):
pl_format.in=LE|B08|SI; break;
case(AFMT_S16_LE):
pl_format.in=LE|B16|SI; break;
case(AFMT_S16_BE):
pl_format.in=BE|B16|SI; break;
case(AFMT_U16_LE):
pl_format.in=LE|B16|US; break;
case(AFMT_U16_BE):
pl_format.in=BE|B16|US; break;
case(AFMT_S32_LE):
pl_format.in=LE|B32|SI; break;
case(AFMT_S32_BE):
pl_format.in=BE|B32|SI; break;
case(AFMT_IMA_ADPCM):
case(AFMT_MU_LAW):
case(AFMT_A_LAW):
case(AFMT_MPEG):
case(AFMT_AC3):
printf("[pl_format] Input audio format not yet suported \n");
return 0;
default:
printf("[pl_format] Unrecognised input audio format\n"); //This can not happen ....
return 0;
}
// Sheck output format
switch(ao_plugin_cfg.pl_format_type){
case(AFMT_U8):
pl_format.out=LE|B08|US; break;
case(AFMT_S8):
pl_format.out=LE|B08|SI; break;
case(AFMT_S16_LE):
pl_format.out=LE|B16|SI; break;
case(AFMT_S16_BE):
pl_format.out=BE|B16|SI; break;
case(AFMT_U16_LE):
pl_format.out=LE|B16|US; break;
case(AFMT_U16_BE):
pl_format.out=BE|B16|US; break;
case(AFMT_S32_LE):
pl_format.out=LE|B32|SI; break;
case(AFMT_S32_BE):
pl_format.out=BE|B32|SI; break;
case(AFMT_IMA_ADPCM):
case(AFMT_MU_LAW):
case(AFMT_A_LAW):
case(AFMT_MPEG):
case(AFMT_AC3):
printf("[pl_format] Output audio format not yet suported \n");
return 0;
default:
printf("[pl_format] Unrecognised audio output format\n");
return 0;
}
// Tell the world what we are up to
printf("[pl_format] Input format: %s, output format: %s \n",
audio_out_format_name(ao_plugin_data.format),
audio_out_format_name(ao_plugin_cfg.pl_format_type));
// We are changing the format
ao_plugin_data.format=ao_plugin_cfg.pl_format_type;
// And perhaps the buffer size
pl_format.sz_mult=1;
if((pl_format.in&NBITS_MASK) > (pl_format.out&NBITS_MASK))
pl_format.sz_mult/=(double)(1<<((pl_format.in&NBITS_MASK)-(pl_format.out&NBITS_MASK)));
if((pl_format.in&NBITS_MASK) < (pl_format.out&NBITS_MASK))
pl_format.sz_mult*=(double)(1<<((pl_format.out&NBITS_MASK)-(pl_format.in&NBITS_MASK)));
ao_plugin_data.sz_mult/=pl_format.sz_mult;
return 1;
}
// close plugin
static void uninit(){
if(pl_format.data)
free(pl_format.data);
pl_format.data=NULL;
}
// empty buffers
static void reset(){
memset(pl_format.data, 0, pl_format.len);
}
// processes 'ao_plugin_data.len' bytes of 'data'
// called for every block of data
// FIXME: this routine needs to be optimized (it is probably possible to do a lot here)
static int play(){
register int i=0;
void* in_data=ao_plugin_data.data;
void* out_data=pl_format.data;
int len=(ao_plugin_data.len)>>(pl_format.in&NBITS_MASK);
ao_plugin_data.len=(int)(((double)ao_plugin_data.len)*pl_format.sz_mult);
// Change to little endian (Is this true for sun ?)
if((pl_format.in&END_MASK)!=LE){
switch(pl_format.in&NBITS_MASK){
case(B16):{
register uint16_t s;
for(i=1;i<len;i++){
s=((uint16_t*)in_data)[i];
((uint16_t*)in_data)[i]=(uint16_t)(((s&0x00FF)<<8) | (s&0xFF00)>>8);
}
}
break;
case(B32):{
register uint32_t s;
for(i=1;i<len;i++){
s=((uint32_t*)in_data)[i];
((uint32_t*)in_data)[i]=(uint32_t)(((s&0x000000FF)<<24) | ((s&0x0000FF00)<<8) |
((s&0x00FF0000)>>8) | ((s&0xFF000000)>>24));
}
}
break;
}
}
// Change signed/unsigned
if((pl_format.in&SIGN_MASK) != (pl_format.out&SIGN_MASK)){
switch((pl_format.in&NBITS_MASK)){
case(B08):
switch(pl_format.in&SIGN_MASK){
case(US):
for(i=0;i<len;i++)
((int8_t*)in_data)[i]=(int8_t)(-127+((int)((uint8_t*)in_data)[i]));
break;
case(SI):
for(i=0;i<len;i++)
((uint8_t*)in_data)[i]=(uint8_t)(+128+((int)((int8_t*)in_data)[i]));
break;
}
break;
case(B16):
switch(pl_format.in&SIGN_MASK){
case(US):
for(i=0;i<len;i++)
((int16_t*)in_data)[i]=(int16_t)(-32767+((int)((uint16_t*)in_data)[i]));
break;
case(SI):
for(i=0;i<len;i++)
((uint16_t*)in_data)[i]=(uint16_t)(+32768+((int)((int16_t*)in_data)[i]));
break;
}
break;
case(B32):
switch(pl_format.in&SIGN_MASK){
case(US):
for(i=0;i<len;i++)
((int32_t*)in_data)[i]=(int32_t)(((uint32_t*)in_data)[i]-0x80000000);
break;
case(SI):
for(i=0;i<len;i++)
((uint32_t*)in_data)[i]=(uint32_t)(+(1<<31)+((int32_t*)in_data)[i]);
break;
}
break;
}
}
// Change the number of bits
if((pl_format.in&NBITS_MASK) == (pl_format.out&NBITS_MASK)){
int sz=(int)((double)ao_plugin_data.len/pl_format.sz_mult);
for(i=0;i<sz;i++)
((char*)out_data)[i]=((char*)in_data)[i];
} else {
switch(pl_format.in&NBITS_MASK){
case(B08):
switch(pl_format.out&NBITS_MASK){
case(B16):
for(i=1;i<len;i++)
((uint16_t*)out_data)[i]=((uint16_t)((uint8_t*)in_data)[i])<<8;
break;
case(B32):
for(i=1;i<len;i++)
((uint32_t*)out_data)[i]=((uint32_t)((uint8_t*)in_data)[i])<<24;
break;
}
break;
case(B16):
switch(pl_format.out&NBITS_MASK){
case(B08):
for(i=0;i<len;i++)
((uint8_t*)out_data)[i]=(uint8_t)((((uint16_t*)in_data)[i])>>8);
break;
case(B32):
for(i=1;i<len;i++)
((uint32_t*)out_data)[i]=((uint32_t)((uint16_t*)in_data)[i])<<16;
break;
}
break;
case(B32):
switch(pl_format.out&NBITS_MASK){
case(B08):
for(i=0;i<len;i++)
((uint8_t*)out_data)[i]=(uint8_t)((((uint32_t*)in_data)[i])>>24);
break;
case(B16):
for(i=1;i<len;i++)
((uint16_t*)out_data)[i]=(uint16_t)((((uint32_t*)in_data)[i])>>16);
break;
}
break;
}
}
// Switch to the correct endainess (agiain the problem with sun?)
if((pl_format.out&END_MASK)!=LE){
switch(pl_format.in&NBITS_MASK){
case(B16):{
register uint16_t s;
for(i=1;i<len;i++){
s=((uint16_t*)out_data)[i];
((uint16_t*)out_data)[i]=(uint16_t)(((s&0x00FF)<<8) | (s&0xFF00)>>8);
}
}
break;
case(B32):{
register uint32_t s;
for(i=1;i<len;i++){
s=((uint32_t*)out_data)[i];
((uint32_t*)out_data)[i]=(uint32_t)(((s&0x000000FF)<<24) | ((s&0x0000FF00)<<8) |
((s&0x00FF0000)>>8) | ((s&0xFF000000)>>24));
}
}
break;
}
}
ao_plugin_data.data=out_data;
return 1;
}
|
