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Sun audiocs HW does not support AFMT_U8, try to use AFMT_S8 instead. If AFMT_S8

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is available, convert to AFMT_S8 in software.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1808 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
jkeil 2001-08-31 20:34:17 +00:00
parent 5b596b3413
commit ac2fbcbf25
1 changed files with 23 additions and 1 deletions
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24
libao2/ao_sun.c
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@ -54,6 +54,7 @@ static char *audio_dev = "/dev/audio";
static int queued_bursts = 0;
static int queued_samples = 0;
static int bytes_per_sample = 0;
static int convert_u8_s8;
static int audio_fd = -1;
static enum {
RTSC_UNKNOWN = 0,
@ -230,6 +231,7 @@ static int init(int rate,int channels,int format,int flags){
audio_info_t info;
int byte_per_sec;
int ok;
if (ao_subdevice) audio_dev = ao_subdevice;
@ -257,9 +259,23 @@ static int init(int rate,int channels,int format,int flags){
: AUDIO_PRECISION_8);
info.play.channels = ao_channels = channels;
info.play.sample_rate = ao_samplerate = rate;
if(ioctl (audio_fd, AUDIO_SETINFO, &info)<0)
convert_u8_s8 = 0;
ok = ioctl(audio_fd, AUDIO_SETINFO, &info) >= 0;
if (!ok && info.play.encoding == AUDIO_ENCODING_LINEAR8) {
/* sun audiocs hardware does not support U8 format, try S8... */
info.play.encoding = AUDIO_ENCODING_LINEAR;
ok = ioctl(audio_fd, AUDIO_SETINFO, &info) >= 0;
if (ok) {
/* we must perform software U8 -> S8 conversion */
convert_u8_s8 = 1;
}
}
if (!ok) {
printf("audio_setup: your card doesn't support %d channel, %s, %d Hz samplerate\n",
channels, audio_out_format_name(format), rate);
return 0;
}
bytes_per_sample = channels * info.play.precision / 8;
byte_per_sec = bytes_per_sample * rate;
ao_outburst = byte_per_sec > 100000 ? 16384 : 8192;
@ -424,6 +440,12 @@ static int play(void* data,int len,int flags){
}
swab(data, swab_buf, len);
data = swab_buf;
} else if (ao_format == AFMT_U8 && convert_u8_s8) {
int i;
unsigned char *p = data;
for (i = 0, p = data; i < len; i++, p++)
*p ^= 0x80;
}
len = write(audio_fd, data, len);