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Aminet 8
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Aminet 8 (1995)(GTI - Schatztruhe)[!][Oct 1995].iso
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tracker_4_31.lzh
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Arch
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audio.c
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1995-05-12
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161 lines
/* AF/audio.c
vi:ts=3 sw=3:
This code written by:
Andrew "Alf" Leahy email: alf@st.nepean.uws.edu.au
University of Western Sydney - Nepean.
Sydney, Australia. phone: (047) 360622 (work)
Modified by Marc Espie to adjust to tracker 4.0 API.
*/
#include "defs.h"
#include "extern.h"
#include "/usr/local/include/AF/AFlib.h"
ID("$Id: audio.c,v 4.7 1995/05/12 20:41:04 espie Exp espie $")
/* 0 external handset, 1 for internal speaker */
#define SPEAKER 0
#define DEFAULT_SET_MIX
#define SEPARATE_BUFFERS
#include "Arch/common.c"
LOCAL int ssize;
LOCAL ATime t, t_r, act, act_r;
LOCAL AC ac, ac_r;
LOCAL AFAudioConn *aud, *aud_r;
int sample_sizes[] = {
1, /* MU255 */
1, /* ALAW */
2, /* Linear PCM, 16 bits, -1.0 <= x < 1.0 */
2, /* Linear PCM, 32 bits, -1.0 <= x < 1.0 */
1, /* G.721, 64Kbps to/from 32Kbps. */
1, /* G.723, 64Kbps to/from 32Kbps. */
0
};
int open_audio(int f, int s)
{
AFSetACAttributes attributes;
int srate, device;
unsigned int channels;
AEncodeType type;
char *server;
device = SPEAKER;
attributes.preempt = Mix;
attributes.start_timeout = 0;
attributes.end_silence = 0;
attributes.play_gain = 0;
attributes.rec_gain = 0;
if ((server = (char *) getenv("AUDIOFILE")) == NULL)
end_all("Error: AUDIOFILE unset");
else
{
server = (char *) getenv("AUDIOFILE");
if ((aud = AFOpenAudioConn( server )) == NULL)
end_all("Error: can't open connection");
ac = AFCreateAC(aud, device, ACPlayGain, &attributes);
srate = ac->device->playSampleFreq;
type = ac->device->playBufType;
channels = ac->device->playNchannels;
ssize = sample_sizes[type] * channels;
if ((buffer = (char *)malloc(ssize * srate)) == NULL)
end_all("Couldn't allocate play buffer");
t = AFGetTime(ac);
}
stereo=s;
if (stereo)
{
server = (char *) getenv("AUDIORIGHT");
if ((aud = AFOpenAudioConn(server)) == NULL)
end_all("Error: can't open connection");
ac_r = AFCreateAC(aud, device, ACPlayGain, &attributes);
srate = ac->device->playSampleFreq;
type = ac->device->playBufType;
channels = ac->device->playNchannels;
ssize = sample_sizes[type] * channels;
buffer_l = buffer;
if ((buffer_r = (char *)malloc(ssize * srate)) == NULL)
end_all("Couldn't allocate play buffer");
t_r = AFGetTime(ac_r);
}
return srate;
}
void set_synchro(int s)
{
}
int update_frequency()
{
return 0;
}
void output_samples(int left, int right)
{
if (stereo)
{
if (pms == 256)
{
buffer_l[idx] = linear2ulaw(left >>9);
buffer_r[idx++] = linear2ulaw(right >>9);
}
else
{
int s1, s2;
s1 = (left+right)*pps;
s2 = (left-right)*pms;
buffer_l[idx] = linear2ulaw((s1 + s2) >>17);
buffer_r[idx++] = linear2ulaw((s1 - s2) >>17);
}
}
else /* mono */
buffer[idx++] = linear2ulaw((left + right) >>9);
}
void flush_buffer()
{
act = AFPlaySamples(ac, t, idx, buffer);
t += idx/ssize;
if (stereo)
{
act_r = AFPlaySamples(ac_r, t_r, idx, buffer_r);
t_r += idx/ssize;
}
idx = 0;
}
void discard_buffer()
{
}
void close_audio()
{
free(buffer);
/* Alf: I'm not sure whether these functions are needed
I think these are Seg Faulting... */
(void) AFCloseAudioConn(aud);
if (stereo)
(void) AFCloseAudioConn(aud_r);
}