diff options
Diffstat (limited to 'services/audioflinger/AudioMixer.h')
| -rw-r--r-- | services/audioflinger/AudioMixer.h | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/services/audioflinger/AudioMixer.h b/services/audioflinger/AudioMixer.h index f4f142b..c2ff985 100644 --- a/services/audioflinger/AudioMixer.h +++ b/services/audioflinger/AudioMixer.h @@ -205,17 +205,34 @@ private: int32_t* auxBuffer; // 16-byte boundary + + /* Buffer providers are constructed to translate the track input data as needed. + * + * 1) mInputBufferProvider: The AudioTrack buffer provider. + * 2) mReformatBufferProvider: If not NULL, performs the audio reformat to + * match either mMixerInFormat or mDownmixRequiresFormat, if the downmixer + * requires reformat. For example, it may convert floating point input to + * PCM_16_bit if that's required by the downmixer. + * 3) downmixerBufferProvider: If not NULL, performs the channel remixing to match + * the number of channels required by the mixer sink. + * 4) mPostDownmixReformatBufferProvider: If not NULL, performs reformatting from + * the downmixer requirements to the mixer engine input requirements. + */ AudioBufferProvider* mInputBufferProvider; // externally provided buffer provider. CopyBufferProvider* mReformatBufferProvider; // provider wrapper for reformatting. CopyBufferProvider* downmixerBufferProvider; // wrapper for channel conversion. + CopyBufferProvider* mPostDownmixReformatBufferProvider; + // 16-byte boundary int32_t sessionId; - // 16-byte boundary audio_format_t mMixerFormat; // output mix format: AUDIO_FORMAT_PCM_(FLOAT|16_BIT) audio_format_t mFormat; // input track format audio_format_t mMixerInFormat; // mix internal format AUDIO_FORMAT_PCM_(FLOAT|16_BIT) // each track must be converted to this format. + audio_format_t mDownmixRequiresFormat; // required downmixer format + // AUDIO_FORMAT_PCM_16_BIT if 16 bit necessary + // AUDIO_FORMAT_INVALID if no required format float mVolume[MAX_NUM_VOLUMES]; // floating point set volume float mPrevVolume[MAX_NUM_VOLUMES]; // floating point previous volume @@ -225,7 +242,6 @@ private: float mPrevAuxLevel; // floating point prev aux level float mAuxInc; // floating point aux increment - // 16-byte boundary audio_channel_mask_t mMixerChannelMask; uint32_t mMixerChannelCount; @@ -236,6 +252,12 @@ private: void adjustVolumeRamp(bool aux, bool useFloat = false); size_t getUnreleasedFrames() const { return resampler != NULL ? resampler->getUnreleasedFrames() : 0; }; + + status_t prepareForDownmix(); + void unprepareForDownmix(); + status_t prepareForReformat(); + void unprepareForReformat(); + void reconfigureBufferProviders(); }; typedef void (*process_hook_t)(state_t* state, int64_t pts); @@ -382,14 +404,6 @@ private: bool setChannelMasks(int name, audio_channel_mask_t trackChannelMask, audio_channel_mask_t mixerChannelMask); - // TODO: remove unused trackName/trackNum from functions below. - static status_t initTrackDownmix(track_t* pTrack, int trackName); - static status_t prepareTrackForDownmix(track_t* pTrack, int trackNum); - static void unprepareTrackForDownmix(track_t* pTrack, int trackName); - static status_t prepareTrackForReformat(track_t* pTrack, int trackNum); - static void unprepareTrackForReformat(track_t* pTrack, int trackName); - static void reconfigureBufferProviders(track_t* pTrack); - static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); |