diff options
| -rw-r--r-- | audio/audio_hw.c | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/audio/audio_hw.c b/audio/audio_hw.c index 1776de1..90748e4 100644 --- a/audio/audio_hw.c +++ b/audio/audio_hw.c @@ -171,25 +171,6 @@ /* default number of channels for HDMI multichannel output */ #define HDMI_MULTI_DEFAULT_CHANNEL_COUNT 6 -/* Number of pseudo periods for low latency playback. - * These are called "pseudo" periods in that they are not known as periods by ALSA. - * Formerly, ALSA was configured in MMAP mode with 2 large periods, and this - * number was set to 4 (2 didn't work). - * The short periods size and count were only known by the audio HAL. - * Now for low latency, we are using non-MMAP mode and can set this to 2. - */ -#ifdef PLAYBACK_MMAP -#define PLAYBACK_SHORT_PERIOD_COUNT 4 -/* If sample rate converter is required, then use triple-buffering to - * help mask the variance in cycle times. Otherwise use double-buffering. - */ -#elif DEFAULT_OUT_SAMPLING_RATE != MM_FULL_POWER_SAMPLING_RATE -#define PLAYBACK_SHORT_PERIOD_COUNT 3 -#define OUT_RESAMPLER -#else -#define PLAYBACK_SHORT_PERIOD_COUNT 2 -#endif - /* write function */ #ifdef PLAYBACK_MMAP #define PCM_WRITE pcm_mmap_write @@ -242,6 +223,25 @@ /* sampling rate when using VX port for wide band */ #define VX_WB_SAMPLING_RATE 16000 +/* Number of pseudo periods for low latency playback. + * These are called "pseudo" periods in that they are not known as periods by ALSA. + * Formerly, ALSA was configured in MMAP mode with 2 large periods, and this + * number was set to 4 (2 didn't work). + * The short periods size and count were only known by the audio HAL. + * Now for low latency, we are using non-MMAP mode and can set this to 2. + */ +#ifdef PLAYBACK_MMAP +#define PLAYBACK_SHORT_PERIOD_COUNT 4 +/* If sample rate converter is required, then use triple-buffering to + * help mask the variance in cycle times. Otherwise use double-buffering. + */ +#elif DEFAULT_OUT_SAMPLING_RATE != MM_FULL_POWER_SAMPLING_RATE +#define PLAYBACK_SHORT_PERIOD_COUNT 3 +#define OUT_RESAMPLER +#else +#define PLAYBACK_SHORT_PERIOD_COUNT 2 +#endif + /* conversions from dB to ABE and codec gains */ #define DB_TO_ABE_GAIN(x) ((x) + MIXER_ABE_GAIN_0DB) #define DB_TO_CAPTURE_PREAMPLIFIER_VOLUME(x) (((x) + 6) / 6) |