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