diff options
Diffstat (limited to 'include/private')
| -rw-r--r-- | include/private/media/AudioTrackShared.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h index 33a92cd..ffc546e 100644 --- a/include/private/media/AudioTrackShared.h +++ b/include/private/media/AudioTrackShared.h @@ -71,10 +71,13 @@ struct audio_track_cblk_t uint32_t loopStart; uint32_t loopEnd; int loopCount; - volatile union { - uint16_t volume[2]; - uint32_t volumeLR; - }; + + // Channel volumes are fixed point U4.12, so 0x1000 means 1.0. + // Left channel is in [0:15], right channel is in [16:31]. + // Always read and write the combined pair atomically. + // For AudioTrack only, not used by AudioRecord. + uint32_t volumeLR; + uint32_t sampleRate; // NOTE: audio_track_cblk_t::frameSize is not equal to AudioTrack::frameSize() for // 8 bit PCM data: in this case, mCblk->frameSize is based on a sample size of |