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Add pausing to ALSA.

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Also use snd_pcm_avail() instead of avail_update()
for more accuracy (helps dynamic rate control).
This commit is contained in:
Themaister 2013-06-05 02:12:34 +02:00
parent 7c2c94872a
commit 973f35339c
1 changed files with 16 additions and 6 deletions
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22
audio/alsa.c
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@ -26,10 +26,10 @@
typedef struct alsa
{
snd_pcm_t *pcm;
size_t buffer_size;
bool nonblock;
bool has_float;
size_t buffer_size;
bool can_pause;
} alsa_t;
static bool alsa_use_float(void *data)
@ -90,6 +90,8 @@ static void *alsa_init(const char *device, unsigned rate, unsigned latency)
snd_pcm_hw_params_get_buffer_size(params, &buffer_size);
RARCH_LOG("ALSA: Buffer size: %d frames\n", (int)buffer_size);
alsa->buffer_size = snd_pcm_frames_to_bytes(alsa->pcm, buffer_size);
alsa->can_pause = snd_pcm_hw_params_can_pause(params);
RARCH_LOG("ALSA: Can pause: %s.\n", alsa->can_pause ? "yes" : "no");
TRY_ALSA(snd_pcm_sw_params_malloc(&sw_params));
TRY_ALSA(snd_pcm_sw_params_current(alsa->pcm, sw_params));
@ -191,7 +193,11 @@ static ssize_t alsa_write(void *data, const void *buf_, size_t size_)
static bool alsa_stop(void *data)
{
return true;
alsa_t *alsa = (alsa_t*)data;
if (alsa->can_pause)
return snd_pcm_pause(alsa->pcm, 1) == 0;
else
return true;
}
static void alsa_set_nonblock_state(void *data, bool state)
@ -202,7 +208,11 @@ static void alsa_set_nonblock_state(void *data, bool state)
static bool alsa_start(void *data)
{
return true;
alsa_t *alsa = (alsa_t*)data;
if (alsa->can_pause)
return snd_pcm_pause(alsa->pcm, 0) == 0;
else
return true;
}
static void alsa_free(void *data)
@ -224,10 +234,10 @@ static size_t alsa_write_avail(void *data)
{
alsa_t *alsa = (alsa_t*)data;
snd_pcm_sframes_t avail = snd_pcm_avail_update(alsa->pcm);
snd_pcm_sframes_t avail = snd_pcm_avail(alsa->pcm);
if (avail < 0)
{
//RARCH_WARN("[ALSA]: avail_update() failed: %s\n", snd_strerror(avail));
//RARCH_WARN("[ALSA]: snd_pcm_avail() failed: %s\n", snd_strerror(avail));
return alsa->buffer_size;
}