Add RecordBufferConverter for RecordThread data processing
Change-Id: Ia3aab8590cd41e8a7cba0a7345d70d2866d92045
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index d600ea9..053d2e7 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -1049,6 +1049,87 @@
RecordTrack * const mRecordTrack;
};
+ /* The RecordBufferConverter is used for format, channel, and sample rate
+ * conversion for a RecordTrack.
+ *
+ * TODO: Self contained, so move to a separate file later.
+ *
+ * RecordBufferConverter uses the convert() method rather than exposing a
+ * buffer provider interface; this is to save a memory copy.
+ */
+ class RecordBufferConverter
+ {
+ public:
+ RecordBufferConverter(
+ audio_channel_mask_t srcChannelMask, audio_format_t srcFormat,
+ uint32_t srcSampleRate,
+ audio_channel_mask_t dstChannelMask, audio_format_t dstFormat,
+ uint32_t dstSampleRate);
+
+ ~RecordBufferConverter();
+
+ /* Converts input data from an AudioBufferProvider by format, channelMask,
+ * and sampleRate to a destination buffer.
+ *
+ * Parameters
+ * dst: buffer to place the converted data.
+ * provider: buffer provider to obtain source data.
+ * frames: number of frames to convert
+ *
+ * Returns the number of frames converted.
+ */
+ size_t convert(void *dst, AudioBufferProvider *provider, size_t frames);
+
+ // returns NO_ERROR if constructor was successful
+ status_t initCheck() const {
+ // mSrcChannelMask set on successful updateParameters
+ return mSrcChannelMask != AUDIO_CHANNEL_INVALID ? NO_ERROR : NO_INIT;
+ }
+
+ // allows dynamic reconfigure of all parameters
+ status_t updateParameters(
+ audio_channel_mask_t srcChannelMask, audio_format_t srcFormat,
+ uint32_t srcSampleRate,
+ audio_channel_mask_t dstChannelMask, audio_format_t dstFormat,
+ uint32_t dstSampleRate);
+
+ // called to reset resampler buffers on record track discontinuity
+ void reset() {
+ if (mResampler != NULL) {
+ mResampler->reset();
+ }
+ }
+
+ private:
+ // internal convert function for format and channel mask.
+ void convert(void *dst, /*const*/ void *src, size_t frames);
+
+ // user provided information
+ audio_channel_mask_t mSrcChannelMask;
+ audio_format_t mSrcFormat;
+ uint32_t mSrcSampleRate;
+ audio_channel_mask_t mDstChannelMask;
+ audio_format_t mDstFormat;
+ uint32_t mDstSampleRate;
+
+ // derived information
+ uint32_t mSrcChannelCount;
+ uint32_t mDstChannelCount;
+ size_t mDstFrameSize;
+
+ // format conversion buffer
+ void *mBuf;
+ size_t mBufFrames;
+ size_t mBufFrameSize;
+
+ // resampler info
+ AudioResampler *mResampler;
+ // interleaved stereo pairs of fixed-point Q4.27 or float depending on resampler
+ void *mRsmpOutBuffer;
+ // current allocated frame count for the above, which may be larger than needed
+ size_t mRsmpOutFrameCount;
+ };
+
#include "RecordTracks.h"
RecordThread(const sp<AudioFlinger>& audioFlinger,