[alsa-devel] [PATCH] alsabat: add buffer size and period size setup support
Liam Girdwood
liam.r.girdwood at linux.intel.com
Mon May 30 11:23:16 CEST 2016
On Mon, 2016-05-30 at 17:07 +0800, vivian.zhang at intel.com wrote:
> From: "vivian,zhang" <vivian.zhang at intel.com>
>
Commit message ?
> 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)
It might be possible to if (a > 0 && b == 0) to save a level of
indentation here.
> + 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;
Probably best to have a macro for min and max values here and below.
> + 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;
Probably best to also have a macro for default period size too.
> config->period_count = 4;
> config->start_threshold = 0;
> config->stop_threshold = 0;
Liam
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