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Improved automatic start/stop

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This commit is contained in:
Abramo Bagnara 2001-04-19 21:18:24 +00:00
parent 25f6d0f912
commit ef6875f4ed
1 changed files with 53 additions and 26 deletions
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35
aplay/aplay.c
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@ -79,6 +79,8 @@ static int chunk_size = -1;
static int period_time = -1;
static int buffer_time = -1;
static int avail_min = -1;
static int start_delay = 1;
static int stop_delay = 0;
static int verbose = 0;
static int buffer_pos = 0;
static size_t bits_per_sample, bits_per_frame;
@ -151,7 +153,9 @@ Usage: %s [OPTION]... [FILE]...
-F, --period-time=# distance between interrupts is # microseconds
-B, --buffer-time=# buffer duration is # microseconds
-A, --avail-min=# min available space for wakeup is # microseconds
-X, --xfer-min=# min xfer size is # microseconds
-R, --start-delay=# delay for automatic PCM start is # microseconds
(relative to buffer size if <= 0)
-T, --stop-delay=# delay for automatic PCM stop is # microseconds from xrun
-v, --verbose show PCM structure and setup
-I, --separate-channels one file for each channel
-P, --iec958p AES IEC958 professional
@ -264,7 +268,7 @@ static void version(void)
int main(int argc, char *argv[])
{
int option_index;
char *short_options = "lLD:qt:c:f:r:d:s:MNF:A:X:B:vIPC";
char *short_options = "lLD:qt:c:f:r:d:s:MNF:A:X:R:T:B:vIPC";
static struct option long_options[] = {
{"help", 0, 0, OPT_HELP},
{"version", 0, 0, OPT_VERSION},
@ -282,7 +286,8 @@ int main(int argc, char *argv[])
{"nonblock", 0, 0, 'N'},
{"period_time", 1, 0, 'F'},
{"avail-min", 1, 0, 'A'},
{"xfer-min", 1, 0, 'X'},
{"start-delay", 1, 0, 'R'},
{"stop-delay", 1, 0, 'T'},
{"buffer-time", 1, 0, 'B'},
{"verbose", 0, 0, 'v'},
{"iec958c", 0, 0, 'C'},
@ -404,6 +409,12 @@ int main(int argc, char *argv[])
case 'A':
avail_min = atoi(optarg);
break;
case 'R':
start_delay = atoi(optarg);
break;
case 'T':
stop_delay = atoi(optarg);
break;
case 'v':
verbose = 1;
break;
@ -732,6 +743,8 @@ static void set_params(void)
int err;
size_t n;
size_t xfer_align;
unsigned int rate;
snd_pcm_uframes_t start_threshold, stop_threshold;
snd_pcm_hw_params_alloca(&params);
snd_pcm_sw_params_alloca(&swparams);
err = snd_pcm_hw_params_any(handle, params);
@ -773,6 +786,7 @@ static void set_params(void)
#endif
err = snd_pcm_hw_params_set_rate_near(handle, params, hwparams.rate, 0);
assert(err >= 0);
rate = err;
if (buffer_time < 0)
buffer_time = 500000;
buffer_time = snd_pcm_hw_params_set_buffer_time_near(handle, params,
@ -805,9 +819,22 @@ static void set_params(void)
if (avail_min < 0)
n = chunk_size;
else
n = snd_pcm_hw_params_get_rate(params, 0) * (double) avail_min / 1000000;
n = (double) rate * avail_min / 1000000;
err = snd_pcm_sw_params_set_avail_min(handle, swparams, n);
if (start_delay <= 0)
start_threshold = buffer_size + (double) rate * start_delay / 1000000;
else
start_threshold = (double) rate * start_delay / 1000000;
err = snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold);
assert(err >= 0);
if (stop_delay <= 0)
stop_threshold = buffer_size + (double) rate * stop_delay / 1000000;
else
stop_threshold = (double) rate * stop_delay / 1000000;
err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
assert(err >= 0);
err = snd_pcm_sw_params_set_xfer_align(handle, swparams, xfer_align);
assert(err >= 0);
if (snd_pcm_sw_params(handle, swparams) < 0) {