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ao.c
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ao.c
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/*
* mpc123 - Musepack Console audio player
* Copyright (C) 2005-2008 Fernando Vezzosi <github-mpc123 at repnz.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "mpc123.h"
#include <ao/ao.h>
typedef struct mpc123_ao_data {
ao_device * ao_dev;
void * output_buffer;
unsigned int output_buffer_size;
} mpc123_ao_data;
/* free a linked-list of ao_option's */
static void walk_free(ao_option * elem){
if(elem->next){
walk_free(elem->next);
}
free(elem);
}
void mpc123_choose_default_dev_by_driver(){
/* device is already specified? then we don't need work here */
if ( options.ao_dev ){
debugf("WARNING: device already present (\"%s\"), but they want me"
" to find another one .. why ??", options.ao_dev);
return;
}
/* default device for oss is /dev/dsp */
if ( !strcmp(options.ao_driver, "oss") ){
options.ao_dev="/dev/dsp";
return;
}
/* this matches "alsa" as well as "alsa09", use default card */
if ( !strncmp(options.ao_driver, "alsa", strlen("alsa")) ){
options.ao_dev="default";
return;
}
/* other drivers don't need special device specs */
}
int mpc123_ao_init(void ** d, mpc_streaminfo * streaminfo){
int ao_drvnum=-1;
ao_sample_format ao_fmt;
ao_info * ao_dinfo=NULL;
ao_option * opt_head=NULL;
int i;
*d=malloc(sizeof(mpc123_ao_data));
mpc123_ao_data * data=(mpc123_ao_data *) *d;
data->output_buffer=NULL;
data->output_buffer_size=0U;
ao_initialize();
ao_drvnum=ao_driver_id(options.ao_driver);
if( ao_drvnum < 0 )
die("No suitable output driver\n");
/* set esd options */
if( !strcmp(options.ao_driver, "esd") ){
opt_head=malloc(sizeof(ao_option));
opt_head->key="esd";
opt_head->value=options.ao_dev;
opt_head->next=NULL;
debugf("[ESD] ao_opts{%s}=%s", opt_head->key, opt_head->value);
}
/* set oss options */
if( !strcmp(options.ao_driver, "oss") ){
opt_head=malloc(sizeof(ao_option));
opt_head->key="dsp";
opt_head->value=options.ao_dev;
opt_head->next=NULL;
debugf("[OSS] ao_opts{%s}=%s", opt_head->key, opt_head->value);
}
/* set alsa options */
if( !strcmp(options.ao_driver, "alsa09") ){
opt_head=malloc(sizeof(ao_option));
opt_head->key="dev";
opt_head->value=options.ao_dev;
opt_head->next=NULL;
debugf("[ALSA] ao_opts{%s}=%s", opt_head->key, opt_head->value);
}
ao_dinfo=ao_driver_info(ao_drvnum);
debugf("<aodriver> type=%s",
ao_dinfo->type == AO_TYPE_LIVE ? "live" :
ao_dinfo->type == AO_TYPE_FILE ? "file" :
"unknown");
debugf("<aodriver> name=%s", ao_dinfo->name);
debugf("<aodriver> sname=%s", ao_dinfo->short_name);
debugf("<aodriver> comment=%s", ao_dinfo->comment);
debug("<aodriver> options={");
for(i=0; i<ao_dinfo->option_count; i++){
debugf(" %s", ao_dinfo->options[i]);
}
debug("}");
sayf(2, "Using ao driver \"%s\" (libao id %d)\n", ao_dinfo->name, ao_drvnum);
/* initialize ao_format struct */
/* XXX VERY WRONG */
memset(&ao_fmt, 0, sizeof(ao_fmt));
ao_fmt.bits=16; /*tmp_stream_info.average_bitrate;*/
ao_fmt.rate=streaminfo->sample_freq;
ao_fmt.channels=streaminfo->channels;
ao_fmt.byte_format=AO_FMT_LITTLE;
/* output audio params */
debugf("<ao_fmt> bits = %d", ao_fmt.bits);
debugf("<ao_fmt> rate = %d", ao_fmt.rate);
debugf("<ao_fmt> channels = %d", ao_fmt.channels);
debugf("<ao_fmt> byte_format = %d", ao_fmt.byte_format);
#if 0
if(strcmp(options.ao_driver,"wav") /* ao_driver IS NOT wav */
&& strcmp(options.ao_driver,"raw") /* NOR raw */
&& strcmp(options.ao_driver,"au")){ /* NOR au */
#endif
if(ao_dinfo->type == AO_TYPE_LIVE){
/* live playing! */
data->ao_dev=ao_open_live(ao_drvnum, &ao_fmt, opt_head);
}else{
/* output to file (act as a decoder) */
data->ao_dev=ao_open_file(ao_drvnum, options.foutput, MPC_TRUE, &ao_fmt, NULL);
}
if( !data->ao_dev ){
dief(_("Could not open audio output: [%d] %s\n"), errno, strerror(errno));
}
if(opt_head)
walk_free(opt_head);
return 0;
}
#ifdef MPC_FIXED_POINT
inline static int shift_signed(MPC_SAMPLE_FORMAT val, int shift)
{
if (shift > 0)
val <<= shift;
else if (shift < 0)
val >>= -shift;
return (int) val;
}
#endif
/* play buffer[samples * 2] on device data->ao_dev */
int mpc123_ao_play(void * d, MPC_SAMPLE_FORMAT * buffer, unsigned samples){
mpc123_ao_data * data=(mpc123_ao_data *) d;
unsigned n; int val;
unsigned char * output;
unsigned bytes=samples * 2; /* 16 bit == 2 bytes */
if(!bytes)
return 0;
const unsigned pSize = 16;
const int clip_min = -1 << (pSize - 1);
const int clip_max = (1 << (pSize - 1)) - 1;
const int float_scale = 1 << (pSize - 1);
/* if the buffer is already allocated, use it */
output = data->output_buffer ? (unsigned char *) data->output_buffer :
(data->output_buffer = (unsigned char *) malloc(bytes));
/* realloc if the size changed */
if(data->output_buffer_size != bytes){
debugf("osize=%d nsize=%d", data->output_buffer_size, bytes);
output = data->output_buffer = realloc(data->output_buffer, bytes);
data->output_buffer_size = bytes;
}
if(!output){
sayf(0, "Out of memory (needed 0x%08x bytes)\n", bytes);
return 0;
}
/* code stolen from xmms-musepack */
for (n = 0; n < samples; n++) {
#ifdef MPC_FIXED_POINT
val = shift_signed(buffer[n], pSize - MPC_FIXED_POINT_SCALE_SHIFT);
#else
/* adjust gain */
buffer[n] *= options.volume;
/* convert to pcm */
val = (int) (buffer[n] * float_scale);
#endif
if (val < clip_min)
val = clip_min;
else if (val > clip_max)
val = clip_max;
/* store pcm bytes in buffer, in the right order */
output[n * 2] = (unsigned char) (val & 0xFF);
output[n * 2 + 1] = (unsigned char) ((val >> 8) & 0xFF);
}
/* ao_play(ao_device *, void *, uint_32); */
val=ao_play(data->ao_dev, (void *)output, bytes);
return val;
}
/* called when done playing */
int mpc123_ao_done(void * d){
mpc123_ao_data * data=(mpc123_ao_data *) d;
ao_close(data->ao_dev);
free(data);
return 0;
}
/* vim:ft=c:tw=78:ts=2:et:cin:
*/