1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
#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)
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_data.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_data.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: delay in seconds between first and last sample in buffer
static float get_delay(){
return 0.0;
}
|
