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(tinyalsa) Calculate initial latency.

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This commit is contained in:
Charlton Head 2017-06-28 10:41:47 -05:00
parent 626b8b5dae
commit 768dbb5210
1 changed files with 20 additions and 13 deletions
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33
audio/drivers/tinyalsa.c
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@ -2147,10 +2147,12 @@ static void * tinyalsa_init(const char *devicestr, unsigned rate,
unsigned latency, unsigned block_frames,
unsigned *new_rate)
{
unsigned int card = 0;
unsigned int device = 0;
unsigned int orig_rate = rate;
unsigned int card = 0;
unsigned int device = 0;
unsigned int frames_per_ms = 0;
unsigned int orig_rate = rate;
unsigned int max_rate, min_rate;
float initial_latency;
snd_pcm_uframes_t buffer_size;
struct pcm_config config;
@ -2217,26 +2219,31 @@ static void * tinyalsa_init(const char *devicestr, unsigned rate,
goto error;
}
if (latency < 10)
buffer_size = pcm_get_buffer_size(tinyalsa->pcm);
tinyalsa->buffer_size = pcm_frames_to_bytes(tinyalsa->pcm, buffer_size);
tinyalsa->frame_bits = pcm_format_to_bits(config.format) * 2;
initial_latency = (float)(buffer_size * 1000) / (float)(rate * 4);
frames_per_ms = buffer_size / initial_latency;
if (latency < (unsigned int)initial_latency)
{
RARCH_WARN("[TINYALSA]: Cannot have a latency less than 10ms. Defaulting to 64ms.\n");
RARCH_WARN("[TINYALSA]: Cannot have a latency less than %ums. "\
"Defaulting to 64ms.\n", (unsigned int)initial_latency);
latency = 64;
}
latency = latency - 10; /* 10ms is our current delay */
buffer_size = pcm_get_buffer_size(tinyalsa->pcm) + (latency * 192);
tinyalsa->buffer_size = pcm_frames_to_bytes(tinyalsa->pcm, buffer_size);
tinyalsa->frame_bits = pcm_format_to_bits(config.format) * 2;
latency -= (unsigned int)initial_latency;
buffer_size += latency * frames_per_ms;
tinyalsa->can_pause = true;
tinyalsa->has_float = false;
RARCH_LOG("[TINYALSA]: Audio rate: %dHz.\n", config.rate);
RARCH_LOG("[TINYALSA]: Audio rate: %uHz.\n", config.rate);
RARCH_LOG("[TINYALSA]: Buffer size: %u frames.\n", buffer_size);
RARCH_LOG("[TINYALSA]: Buffer size: %d bytes.\n", tinyalsa->buffer_size);
RARCH_LOG("[TINYALSA]: Buffer size: %u bytes.\n", tinyalsa->buffer_size);
RARCH_LOG("[TINYALSA]: Frame size: %u bytes.\n", tinyalsa->frame_bits / 8);
RARCH_LOG("[TINYALSA]: Latency: %dms.\n", buffer_size * 1000 / (rate * 4));
RARCH_LOG("[TINYALSA]: Latency: %ums.\n", buffer_size * 1000 / (rate * 4));
return tinyalsa;