[alsa-devel] [PATCH] alsabat: add buffer size and period size setup support
vivian.zhang at intel.com
vivian.zhang at intel.com
Mon May 30 11:07:22 CEST 2016
From: "vivian,zhang" <vivian.zhang at intel.com>
Signed-off-by: Zhang Vivian <vivian.zhang at intel.com>
---
bat/alsa.c | 95 +++++++++++++++++++++++++++++++++++++++-----------------
bat/bat.c | 16 ++++++++--
bat/common.h | 2 ++
bat/tinyalsa.c | 5 ++-
4 files changed, 86 insertions(+), 32 deletions(-)
diff --git a/bat/alsa.c b/bat/alsa.c
index 75158cb..167dbad 100644
--- a/bat/alsa.c
+++ b/bat/alsa.c
@@ -74,6 +74,8 @@ static int set_snd_pcm_params(struct bat *bat, struct pcm_container *sndpcm)
snd_pcm_format_t format;
unsigned int buffer_time = 0;
unsigned int period_time = 0;
+ snd_pcm_uframes_t buffer_size = 0;
+ snd_pcm_uframes_t period_size = 0;
unsigned int rate;
int err;
const char *device_name = snd_pcm_name(sndpcm->handle);
@@ -145,39 +147,71 @@ static int set_snd_pcm_params(struct bat *bat, struct pcm_container *sndpcm)
return -EINVAL;
}
- if (snd_pcm_hw_params_get_buffer_time_max(params,
- &buffer_time, 0) < 0) {
- fprintf(bat->err, _("Get parameter from device error: "));
- fprintf(bat->err, _("buffer time: %d %s: %s(%d)\n"),
- buffer_time,
- device_name, snd_strerror(err), err);
- return -EINVAL;
- }
+ if (bat->buffer_size > 0) {
+ if (bat->period_size == 0)
+ bat->period_size = bat->buffer_size / DIV_BUFFERTIME;
- if (buffer_time > MAX_BUFFERTIME)
- buffer_time = MAX_BUFFERTIME;
+ buffer_size = bat->buffer_size;
+ period_size = bat->period_size;
- period_time = buffer_time / DIV_BUFFERTIME;
+ fprintf(bat->log, _("Set period size: %d buffer size: %d\n"),
+ (int) period_size, (int) buffer_size);
- /* Set buffer time and period time */
- err = snd_pcm_hw_params_set_buffer_time_near(sndpcm->handle, params,
- &buffer_time, 0);
- if (err < 0) {
- fprintf(bat->err, _("Set parameter to device error: "));
- fprintf(bat->err, _("buffer time: %d %s: %s(%d)\n"),
- buffer_time,
- device_name, snd_strerror(err), err);
- return err;
- }
+ err = snd_pcm_hw_params_set_buffer_size_near(sndpcm->handle,
+ params, &buffer_size);
+ if (err < 0) {
+ fprintf(bat->err, _("Set parameter to device error: "));
+ fprintf(bat->err, _("buffer size: %d %s: %s(%d)\n"),
+ (int) buffer_size,
+ device_name, snd_strerror(err), err);
+ return err;
+ }
- err = snd_pcm_hw_params_set_period_time_near(sndpcm->handle, params,
- &period_time, 0);
- if (err < 0) {
- fprintf(bat->err, _("Set parameter to device error: "));
- fprintf(bat->err, _("period time: %d %s: %s(%d)\n"),
- period_time,
- device_name, snd_strerror(err), err);
- return err;
+ err = snd_pcm_hw_params_set_period_size_near(sndpcm->handle,
+ params, &period_size, 0);
+ if (err < 0) {
+ fprintf(bat->err, _("Set parameter to device error: "));
+ fprintf(bat->err, _("period size: %d %s: %s(%d)\n"),
+ (int) period_size,
+ device_name, snd_strerror(err), err);
+ return err;
+ }
+ } else {
+ if (snd_pcm_hw_params_get_buffer_time_max(params,
+ &buffer_time, 0) < 0) {
+ fprintf(bat->err,
+ _("Get parameter from device error: "));
+ fprintf(bat->err, _("buffer time: %d %s: %s(%d)\n"),
+ buffer_time,
+ device_name, snd_strerror(err), err);
+ return -EINVAL;
+ }
+
+ if (buffer_time > MAX_BUFFERTIME)
+ buffer_time = MAX_BUFFERTIME;
+
+ period_time = buffer_time / DIV_BUFFERTIME;
+
+ /* Set buffer time and period time */
+ err = snd_pcm_hw_params_set_buffer_time_near(sndpcm->handle,
+ params, &buffer_time, 0);
+ if (err < 0) {
+ fprintf(bat->err, _("Set parameter to device error: "));
+ fprintf(bat->err, _("buffer time: %d %s: %s(%d)\n"),
+ buffer_time,
+ device_name, snd_strerror(err), err);
+ return err;
+ }
+
+ err = snd_pcm_hw_params_set_period_time_near(sndpcm->handle,
+ params, &period_time, 0);
+ if (err < 0) {
+ fprintf(bat->err, _("Set parameter to device error: "));
+ fprintf(bat->err, _("period time: %d %s: %s(%d)\n"),
+ period_time,
+ device_name, snd_strerror(err), err);
+ return err;
+ }
}
/* Write the parameters to the driver */
@@ -214,6 +248,9 @@ static int set_snd_pcm_params(struct bat *bat, struct pcm_container *sndpcm)
return -EINVAL;
}
+ fprintf(bat->log, _("Get period size: %d buffer size: %d\n"),
+ (int) sndpcm->period_size, (int) sndpcm->buffer_size);
+
err = snd_pcm_format_physical_width(format);
if (err < 0) {
fprintf(bat->err, _("Invalid parameters: "));
diff --git a/bat/bat.c b/bat/bat.c
index 1afdcb4..0d5aaa5 100644
--- a/bat/bat.c
+++ b/bat/bat.c
@@ -292,6 +292,8 @@ _("Usage: alsabat [-options]...\n"
" -k parameter for frequency detecting threshold\n"
" -F target frequency\n"
" -p total number of periods to play/capture\n"
+" -B buffer size in frames\n"
+" -E period size in frames\n"
" --log=# file that both stdout and strerr redirecting to\n"
" --file=# file for playback\n"
" --saveplay=# file that storing playback content, for debug\n"
@@ -324,6 +326,8 @@ static void set_defaults(struct bat *bat)
bat->capture.device = NULL;
bat->buf = NULL;
bat->local = false;
+ bat->buffer_size = 0;
+ bat->period_size = 0;
#ifdef HAVE_LIBTINYALSA
bat->channels = 2;
bat->playback.fct = &playback_tinyalsa;
@@ -342,8 +346,8 @@ static void set_defaults(struct bat *bat)
static void parse_arguments(struct bat *bat, int argc, char *argv[])
{
- int c, option_index;
- static const char short_options[] = "D:P:C:f:n:F:c:r:s:k:p:lth";
+ int c, option_index, err;
+ static const char short_options[] = "D:P:C:f:n:F:c:r:s:k:p:B:E:lth";
static const struct option long_options[] = {
{"help", 0, 0, 'h'},
{"log", 1, 0, OPT_LOG},
@@ -414,6 +418,14 @@ static void parse_arguments(struct bat *bat, int argc, char *argv[])
bat->periods_total = atoi(optarg);
bat->period_is_limited = true;
break;
+ case 'B':
+ err = atoi(optarg);
+ bat->buffer_size = err >= 32 && err < 200000 ? err : 0;
+ break;
+ case 'E':
+ err = atoi(optarg);
+ bat->period_size = err >= 32 && err < 200000 ? err : 0;
+ break;
case 'h':
default:
usage(bat);
diff --git a/bat/common.h b/bat/common.h
index b789af5..52c8cb1 100644
--- a/bat/common.h
+++ b/bat/common.h
@@ -152,6 +152,8 @@ struct bat {
int frame_size; /* size of frame */
int sample_size; /* size of sample */
enum _bat_pcm_format format; /* PCM format */
+ int buffer_size; /* buffer size in frames */
+ int period_size; /* period size in frames */
float sigma_k; /* threshold for peak detection */
float target_freq[MAX_CHANNELS];
diff --git a/bat/tinyalsa.c b/bat/tinyalsa.c
index ea5f848..faa1ad0 100644
--- a/bat/tinyalsa.c
+++ b/bat/tinyalsa.c
@@ -57,7 +57,10 @@ static int init_config(struct bat *bat, struct pcm_config *config)
{
config->channels = bat->channels;
config->rate = bat->rate;
- config->period_size = 1024;
+ if (bat->period_size > 0)
+ config->period_size = bat->period_size;
+ else
+ config->period_size = 1024;
config->period_count = 4;
config->start_threshold = 0;
config->stop_threshold = 0;
--
1.7.9.5
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