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moved code in pcm_open() to pcm_set_config()

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This commit is contained in:
Taylor Holberton
2017-04-10 12:05:51 -07:00
parent cad23d2482
commit 861da7ab05
1 changed files with 173 additions and 153 deletions
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src/pcm.c
+173 -153
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@@ -160,6 +160,36 @@ static void param_init(struct snd_pcm_hw_params *p)
p->info = ~0U;
}
static unsigned int pcm_format_to_alsa(enum pcm_format format)
{
switch (format) {
case PCM_FORMAT_S8:
return SNDRV_PCM_FORMAT_S8;
default:
case PCM_FORMAT_S16_LE:
return SNDRV_PCM_FORMAT_S16_LE;
case PCM_FORMAT_S16_BE:
return SNDRV_PCM_FORMAT_S16_BE;
case PCM_FORMAT_S24_LE:
return SNDRV_PCM_FORMAT_S24_LE;
case PCM_FORMAT_S24_BE:
return SNDRV_PCM_FORMAT_S24_BE;
case PCM_FORMAT_S24_3LE:
return SNDRV_PCM_FORMAT_S24_3LE;
case PCM_FORMAT_S24_3BE:
return SNDRV_PCM_FORMAT_S24_3BE;
case PCM_FORMAT_S32_LE:
return SNDRV_PCM_FORMAT_S32_LE;
case PCM_FORMAT_S32_BE:
return SNDRV_PCM_FORMAT_S32_BE;
};
}
#define PCM_ERROR_MAX 128
/** A PCM handle.
@@ -195,6 +225,22 @@ struct pcm {
unsigned int subdevice;
};
static int oops(struct pcm *pcm, int e, const char *fmt, ...)
{
va_list ap;
int sz;
va_start(ap, fmt);
vsnprintf(pcm->error, PCM_ERROR_MAX, fmt, ap);
va_end(ap);
sz = strlen(pcm->error);
if (errno)
snprintf(pcm->error + sz, PCM_ERROR_MAX - sz,
": %s", strerror(e));
return -1;
}
/** Gets the buffer size of the PCM.
* @param pcm A PCM handle.
* @return The buffer size of the PCM.
@@ -272,6 +318,132 @@ const char* pcm_get_error(const struct pcm *pcm)
return pcm->error;
}
/** Sets the PCM configuration.
* @param pcm A PCM handle.
* @param config The configuration to use for the
* PCM. This parameter may be NULL, in which case
* the default configuration is used.
* @returns Zero on success, a negative errno value
* on failure.
* @ingroup libtinyalsa-pcm
* */
int pcm_set_config(struct pcm *pcm, const struct pcm_config *config)
{
if (pcm == NULL)
return -EFAULT;
else if (config == NULL) {
config = &pcm->config;
pcm->config.channels = 2;
pcm->config.rate = 48000;
pcm->config.period_size = 1024;
pcm->config.period_count = 4;
pcm->config.format = PCM_FORMAT_S16_LE;
pcm->config.start_threshold = config->period_count * config->period_size;
pcm->config.stop_threshold = config->period_count * config->period_size;
pcm->config.silence_threshold = 0;
} else
pcm->config = *config;
struct snd_pcm_hw_params params;
param_init(&params);
param_set_mask(&params, SNDRV_PCM_HW_PARAM_FORMAT,
pcm_format_to_alsa(config->format));
param_set_mask(&params, SNDRV_PCM_HW_PARAM_SUBFORMAT,
SNDRV_PCM_SUBFORMAT_STD);
param_set_min(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size);
param_set_int(&params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
pcm_format_to_bits(config->format));
param_set_int(&params, SNDRV_PCM_HW_PARAM_FRAME_BITS,
pcm_format_to_bits(config->format) * config->channels);
param_set_int(&params, SNDRV_PCM_HW_PARAM_CHANNELS,
config->channels);
param_set_int(&params, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count);
param_set_int(&params, SNDRV_PCM_HW_PARAM_RATE, config->rate);
if (pcm->flags & PCM_NOIRQ) {
if (!(pcm->flags & PCM_MMAP)) {
oops(pcm, -EINVAL, "noirq only currently supported with mmap().");
return -EINVAL;
}
params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP;
pcm->noirq_frames_per_msec = config->rate / 1000;
}
if (pcm->flags & PCM_MMAP)
param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
else
param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_ACCESS_RW_INTERLEAVED);
if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, &params)) {
int errno_copy = errno;
oops(pcm, -errno, "cannot set hw params");
return -errno_copy;
}
/* get our refined hw_params */
pcm->config.period_size = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
pcm->config.period_count = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIODS);
pcm->buffer_size = config->period_count * config->period_size;
if (pcm->flags & PCM_MMAP) {
pcm->mmap_buffer = mmap(NULL, pcm_frames_to_bytes(pcm, pcm->buffer_size),
PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, pcm->fd, 0);
if (pcm->mmap_buffer == MAP_FAILED) {
int errno_copy = errno;
oops(pcm, -errno, "failed to mmap buffer %d bytes\n",
pcm_frames_to_bytes(pcm, pcm->buffer_size));
return -errno_copy;
}
}
struct snd_pcm_sw_params sparams;
memset(&sparams, 0, sizeof(sparams));
sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
sparams.period_step = 1;
sparams.avail_min = 1;
if (!config->start_threshold) {
if (pcm->flags & PCM_IN)
pcm->config.start_threshold = sparams.start_threshold = 1;
else
pcm->config.start_threshold = sparams.start_threshold =
config->period_count * config->period_size / 2;
} else
sparams.start_threshold = config->start_threshold;
/* pick a high stop threshold - todo: does this need further tuning */
if (!config->stop_threshold) {
if (pcm->flags & PCM_IN)
pcm->config.stop_threshold = sparams.stop_threshold =
config->period_count * config->period_size * 10;
else
pcm->config.stop_threshold = sparams.stop_threshold =
config->period_count * config->period_size;
}
else
sparams.stop_threshold = config->stop_threshold;
sparams.xfer_align = config->period_size / 2; /* needed for old kernels */
sparams.silence_size = 0;
sparams.silence_threshold = config->silence_threshold;
pcm->boundary = sparams.boundary = pcm->buffer_size;
while (pcm->boundary * 2 <= INT_MAX - pcm->buffer_size)
pcm->boundary *= 2;
if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)) {
int errno_copy = errno;
oops(pcm, -errno, "cannot set sw params");
return -errno_copy;
}
return 0;
}
/** Gets the subdevice on which the pcm has been opened.
* @param pcm A PCM handle.
* @return The subdevice on which the pcm has been opened */
@@ -280,52 +452,6 @@ unsigned int pcm_get_subdevice(const struct pcm *pcm)
return pcm->subdevice;
}
static int oops(struct pcm *pcm, int e, const char *fmt, ...)
{
va_list ap;
int sz;
va_start(ap, fmt);
vsnprintf(pcm->error, PCM_ERROR_MAX, fmt, ap);
va_end(ap);
sz = strlen(pcm->error);
if (errno)
snprintf(pcm->error + sz, PCM_ERROR_MAX - sz,
": %s", strerror(e));
return -1;
}
static unsigned int pcm_format_to_alsa(enum pcm_format format)
{
switch (format) {
case PCM_FORMAT_S8:
return SNDRV_PCM_FORMAT_S8;
default:
case PCM_FORMAT_S16_LE:
return SNDRV_PCM_FORMAT_S16_LE;
case PCM_FORMAT_S16_BE:
return SNDRV_PCM_FORMAT_S16_BE;
case PCM_FORMAT_S24_LE:
return SNDRV_PCM_FORMAT_S24_LE;
case PCM_FORMAT_S24_BE:
return SNDRV_PCM_FORMAT_S24_BE;
case PCM_FORMAT_S24_3LE:
return SNDRV_PCM_FORMAT_S24_3LE;
case PCM_FORMAT_S24_3BE:
return SNDRV_PCM_FORMAT_S24_3BE;
case PCM_FORMAT_S32_LE:
return SNDRV_PCM_FORMAT_S32_LE;
case PCM_FORMAT_S32_BE:
return SNDRV_PCM_FORMAT_S32_BE;
};
}
/** Determines the number of bits occupied by a @ref pcm_format.
* @param format A PCM format.
* @return The number of bits associated with @p format
@@ -930,8 +1056,6 @@ struct pcm *pcm_open(unsigned int card, unsigned int device,
{
struct pcm *pcm;
struct snd_pcm_info info;
struct snd_pcm_hw_params params;
struct snd_pcm_sw_params sparams;
char fn[256];
int rc;
@@ -939,20 +1063,6 @@ struct pcm *pcm_open(unsigned int card, unsigned int device,
if (!pcm)
return &bad_pcm;
if (config == NULL) {
config = &pcm->config;
pcm->config.channels = 2;
pcm->config.rate = 48000;
pcm->config.period_size = 1024;
pcm->config.period_count = 4;
pcm->config.format = PCM_FORMAT_S16_LE;
pcm->config.start_threshold = config->period_count * config->period_size;
pcm->config.stop_threshold = config->period_count * config->period_size;
pcm->config.silence_threshold = 0;
} else {
pcm->config = *config;
}
snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device,
flags & PCM_IN ? 'c' : 'p');
@@ -969,98 +1079,8 @@ struct pcm *pcm_open(unsigned int card, unsigned int device,
}
pcm->subdevice = info.subdevice;
param_init(&params);
param_set_mask(&params, SNDRV_PCM_HW_PARAM_FORMAT,
pcm_format_to_alsa(config->format));
param_set_mask(&params, SNDRV_PCM_HW_PARAM_SUBFORMAT,
SNDRV_PCM_SUBFORMAT_STD);
param_set_min(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size);
param_set_int(&params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
pcm_format_to_bits(config->format));
param_set_int(&params, SNDRV_PCM_HW_PARAM_FRAME_BITS,
pcm_format_to_bits(config->format) * config->channels);
param_set_int(&params, SNDRV_PCM_HW_PARAM_CHANNELS,
config->channels);
param_set_int(&params, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count);
param_set_int(&params, SNDRV_PCM_HW_PARAM_RATE, config->rate);
if (flags & PCM_NOIRQ) {
if (!(flags & PCM_MMAP)) {
oops(pcm, -EINVAL, "noirq only currently supported with mmap().");
goto fail;
}
params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP;
pcm->noirq_frames_per_msec = config->rate / 1000;
}
if (flags & PCM_MMAP)
param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
else
param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_ACCESS_RW_INTERLEAVED);
if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, &params)) {
oops(pcm, errno, "cannot set hw params");
if (pcm_set_config(pcm, config) != 0)
goto fail_close;
}
/* get our refined hw_params */
pcm->config.period_size = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
pcm->config.period_count = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIODS);
pcm->buffer_size = config->period_count * config->period_size;
if (flags & PCM_MMAP) {
pcm->mmap_buffer = mmap(NULL, pcm_frames_to_bytes(pcm, pcm->buffer_size),
PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, pcm->fd, 0);
if (pcm->mmap_buffer == MAP_FAILED) {
oops(pcm, -errno, "failed to mmap buffer %d bytes\n",
pcm_frames_to_bytes(pcm, pcm->buffer_size));
goto fail_close;
}
}
memset(&sparams, 0, sizeof(sparams));
sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
sparams.period_step = 1;
sparams.avail_min = 1;
if (!config->start_threshold) {
if (pcm->flags & PCM_IN)
pcm->config.start_threshold = sparams.start_threshold = 1;
else
pcm->config.start_threshold = sparams.start_threshold =
config->period_count * config->period_size / 2;
} else
sparams.start_threshold = config->start_threshold;
/* pick a high stop threshold - todo: does this need further tuning */
if (!config->stop_threshold) {
if (pcm->flags & PCM_IN)
pcm->config.stop_threshold = sparams.stop_threshold =
config->period_count * config->period_size * 10;
else
pcm->config.stop_threshold = sparams.stop_threshold =
config->period_count * config->period_size;
}
else
sparams.stop_threshold = config->stop_threshold;
sparams.xfer_align = config->period_size / 2; /* needed for old kernels */
sparams.silence_size = 0;
sparams.silence_threshold = config->silence_threshold;
pcm->boundary = sparams.boundary = pcm->buffer_size;
while (pcm->boundary * 2 <= INT_MAX - pcm->buffer_size)
pcm->boundary *= 2;
if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)) {
oops(pcm, errno, "cannot set sw params");
goto fail;
}
rc = pcm_hw_mmap_status(pcm);
if (rc < 0) {