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audio/hal: Set playback buffer size to integral multiple of msec 

- Set the deep-buffer and low-latency output buffer sizes to
  integral multiple of msec. This reduces the variations in
  the writes.
- Compute the input buffer size based on sample rate. Use 20msec
  buffers in capture path.

Bug: 9283911, 9106434
Change-Id: Icbcb653f7f0fd3293dd4b514a54ac91d8311b308
This commit is contained in:
Ravi Kumar Alamanda 2013-06-11 14:40:01 -07:00 committed by Vineeta Srivastava
parent b23d528649
commit 33d330678f
3 changed files with 16 additions and 17 deletions
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23
hal/audio_hw.c
View File

@ -73,7 +73,6 @@ struct pcm_config pcm_config_hdmi_multi = {
struct pcm_config pcm_config_audio_capture = {
.channels = 2,
.period_size = AUDIO_CAPTURE_PERIOD_SIZE,
.period_count = AUDIO_CAPTURE_PERIOD_COUNT,
.format = PCM_FORMAT_S16_LE,
};
@ -817,19 +816,19 @@ static size_t get_input_buffer_size(uint32_t sample_rate,
{
size_t size = 0;
if (check_input_parameters(sample_rate, format, channel_count) != 0) return 0;
if (check_input_parameters(sample_rate, format, channel_count) != 0)
return 0;
if (sample_rate == 8000 || sample_rate == 16000 || sample_rate == 32000) {
size = (sample_rate * 20) / 1000;
} else if (sample_rate == 11025 || sample_rate == 12000) {
size = 256;
} else if (sample_rate == 22050 || sample_rate == 24000) {
size = 512;
} else if (sample_rate == 44100 || sample_rate == 48000) {
size = 1024;
}
size = (sample_rate * AUDIO_CAPTURE_PERIOD_DURATION_MSEC) / 1000;
/* ToDo: should use frame_size computed based on the format and
channel_count here. */
size *= sizeof(short) * channel_count;
return size * sizeof(short) * channel_count;
/* make sure the size is multiple of 64 */
size += 0x3f;
size &= ~0x3f;
return size;
}
static uint32_t out_get_sample_rate(const struct audio_stream *stream)

2
hal/msm8960/platform.h
View File

@ -111,7 +111,7 @@ enum {
#define HDMI_MULTI_DEFAULT_CHANNEL_COUNT 6
#define HDMI_MULTI_PERIOD_BYTES (HDMI_MULTI_PERIOD_SIZE * HDMI_MULTI_DEFAULT_CHANNEL_COUNT * 2)
#define AUDIO_CAPTURE_PERIOD_SIZE 320
#define AUDIO_CAPTURE_PERIOD_DURATION_MSEC 20
#define AUDIO_CAPTURE_PERIOD_COUNT 2
#endif // QCOM_AUDIO_PLATFORM_H

8
hal/msm8974/platform.h
View File

@ -102,9 +102,9 @@ enum {
* We should take care of returning proper size when AudioFlinger queries for
* the buffer size of an input/output stream
*/
#define DEEP_BUFFER_OUTPUT_PERIOD_SIZE 1024
#define DEEP_BUFFER_OUTPUT_PERIOD_SIZE 960
#define DEEP_BUFFER_OUTPUT_PERIOD_COUNT 8
#define LOW_LATENCY_OUTPUT_PERIOD_SIZE 256
#define LOW_LATENCY_OUTPUT_PERIOD_SIZE 240
#define LOW_LATENCY_OUTPUT_PERIOD_COUNT 2
#define HDMI_MULTI_PERIOD_SIZE 336
@ -112,7 +112,7 @@ enum {
#define HDMI_MULTI_DEFAULT_CHANNEL_COUNT 6
#define HDMI_MULTI_PERIOD_BYTES (HDMI_MULTI_PERIOD_SIZE * HDMI_MULTI_DEFAULT_CHANNEL_COUNT * 2)
#define AUDIO_CAPTURE_PERIOD_SIZE 512
#define AUDIO_CAPTURE_PERIOD_COUNT 16
#define AUDIO_CAPTURE_PERIOD_DURATION_MSEC 20
#define AUDIO_CAPTURE_PERIOD_COUNT 2
#endif // QCOM_AUDIO_PLATFORM_H