Add enabling variable for extended precision audio
Set AudioFlinger::kEnableExtendedPrecision = true to enable
extended precision. Enabling will be required for devices (such as
USB) which report 24 bit or 32 bit sink formats.
Change-Id: I0dc1d7a4f7607086d7b536ea0e43aef0e696f2ee
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 6e73a14..ddc6afb 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -326,6 +326,24 @@
audio_devices_t devices);
void purgeStaleEffects_l();
+ // Set kEnableExtendedPrecision to true to use extended precision in MixerThread
+ static const bool kEnableExtendedPrecision = false;
+
+ // Returns true if format is permitted for the PCM sink in the MixerThread
+ static inline bool isValidPcmSinkFormat(audio_format_t format) {
+ switch (format) {
+ case AUDIO_FORMAT_PCM_16_BIT:
+ return true;
+ case AUDIO_FORMAT_PCM_FLOAT:
+ case AUDIO_FORMAT_PCM_24_BIT_PACKED:
+ case AUDIO_FORMAT_PCM_32_BIT:
+ case AUDIO_FORMAT_PCM_8_24_BIT:
+ return kEnableExtendedPrecision;
+ default:
+ return false;
+ }
+ }
+
// standby delay for MIXER and DUPLICATING playback threads is read from property
// ro.audio.flinger_standbytime_ms or defaults to kDefaultStandbyTimeInNsecs
static nsecs_t mStandbyTimeInNsecs;