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#include <stdio.h>
#include <stdlib.h>
#include "audio_out.h"
#include "audio_out_internal.h"
static ao_info_t info =
{
"RAW PCM/WAVE file writer audio output",
"pcm",
"Atmosfear",
""
};
LIBAO_EXTERN(pcm)
// there are some globals:
// ao_samplerate
// ao_channels
// ao_format
// ao_bps
// ao_outburst
// ao_buffersize
char *ao_outputfilename = NULL;
int ao_pcm_waveheader = 1;
#define WAV_ID_RIFF 0x46464952 /* "RIFF" */
#define WAV_ID_WAVE 0x45564157 /* "WAVE" */
#define WAV_ID_FMT 0x20746d66 /* "fmt " */
#define WAV_ID_DATA 0x61746164 /* "data" */
#define WAV_ID_PCM 0x0001
struct WaveHeader
{
unsigned long riff;
unsigned long file_length;
unsigned long wave;
unsigned long fmt;
unsigned long fmt_length;
short fmt_tag;
short channels;
unsigned long sample_rate;
unsigned long bytes_per_second;
short block_align;
short bits;
unsigned long data;
unsigned long data_length;
};
static struct WaveHeader wavhdr = {
WAV_ID_RIFF,
0x00000000,
WAV_ID_WAVE,
WAV_ID_FMT,
16,
WAV_ID_PCM,
2,
44100,
192000,
4,
16,
WAV_ID_DATA,
0x00000000
};
static FILE *fp = NULL;
// to set/get/query special features/parameters
static int control(int cmd,int arg){
return -1;
}
// open & setup audio device
// return: 1=success 0=fail
static int init(int rate,int channels,int format,int flags){
if(!ao_outputfilename) {
ao_outputfilename = (char *) malloc(sizeof(char) * 14);
strcpy(ao_outputfilename,(ao_pcm_waveheader ? "audiodump.wav" : "audiodump.pcm"));
}
wavhdr.channels = channels;
wavhdr.sample_rate = rate;
wavhdr.bytes_per_second = rate * (format / 8) * channels;
wavhdr.bits = format;
printf("PCM: File: %s (%s) Samplerate: %iHz Channels: %s Format %s\n", ao_outputfilename, (ao_pcm_waveheader?"WAVE":"RAW PCM"), rate, (channels > 1) ? "Stereo" : "Mono", audio_out_format_name(format));
printf("PCM: Info - fastest dumping is achieved with -vo null -hardframedrop.\n");
printf("PCM: Info - to write WAVE files use -waveheader (default), for RAW PCM -nowaveheader.\n");
fp = fopen(ao_outputfilename, "wb");
ao_outburst = 4096;
if(fp) {
if(ao_pcm_waveheader) /* Reserve space for wave header */
fseek(fp, sizeof(wavhdr), SEEK_SET);
return 1;
}
printf("PCM: Failed to open %s for writing!\n", ao_outputfilename);
return 0;
}
// close audio device
static void uninit(){
if(ao_pcm_waveheader){ /* Write wave header */
wavhdr.file_length = wavhdr.data_length + sizeof(wavhdr);
fseek(fp, 0, SEEK_SET);
fwrite(&wavhdr,sizeof(wavhdr),1,fp);
}
fclose(fp);
free(ao_outputfilename);
}
// stop playing and empty buffers (for seeking/pause)
static void reset(){
}
// stop playing, keep buffers (for pause)
static void audio_pause()
{
// for now, just call reset();
reset();
}
// resume playing, after audio_pause()
static void audio_resume()
{
}
// return: how many bytes can be played without blocking
static int get_space(){
return ao_outburst;
}
// plays 'len' bytes of 'data'
// it should round it down to outburst*n
// return: number of bytes played
static int play(void* data,int len,int flags){
//printf("PCM: Writing chunk!\n");
fwrite(data,len,1,fp);
if(ao_pcm_waveheader)
wavhdr.data_length += len;
return len;
}
// return: how many unplayed bytes are in the buffer
static int get_delay(){
return 0;
}
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