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/*
* Copyright 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "bt_btif_avrcp_audio_track"
#include "btif_avrcp_audio_track.h"
#include <aaudio/AAudio.h>
#include <base/logging.h>
#include <utils/StrongPointer.h>
#include "bt_target.h"
#include "osi/include/log.h"
using namespace android;
typedef struct {
AAudioStream* stream;
int bitsPerSample;
int channelCount;
float* buffer;
size_t bufferLength;
} BtifAvrcpAudioTrack;
#if (DUMP_PCM_DATA == TRUE)
FILE* outputPcmSampleFile;
char outputFilename[50] = "/data/misc/bluedroid/output_sample.pcm";
#endif
void* BtifAvrcpAudioTrackCreate(int trackFreq, int bitsPerSample,
int channelCount) {
LOG_VERBOSE("%s Track.cpp: btCreateTrack freq %d bps %d channel %d ",
__func__, trackFreq, bitsPerSample, channelCount);
AAudioStreamBuilder* builder;
AAudioStream* stream;
aaudio_result_t result = AAudio_createStreamBuilder(&builder);
AAudioStreamBuilder_setSampleRate(builder, trackFreq);
AAudioStreamBuilder_setFormat(builder, AAUDIO_FORMAT_PCM_FLOAT);
AAudioStreamBuilder_setChannelCount(builder, channelCount);
AAudioStreamBuilder_setSessionId(builder, AAUDIO_SESSION_ID_ALLOCATE);
AAudioStreamBuilder_setPerformanceMode(builder,
AAUDIO_PERFORMANCE_MODE_LOW_LATENCY);
result = AAudioStreamBuilder_openStream(builder, &stream);
CHECK(result == AAUDIO_OK);
AAudioStreamBuilder_delete(builder);
BtifAvrcpAudioTrack* trackHolder = new BtifAvrcpAudioTrack;
CHECK(trackHolder != NULL);
trackHolder->stream = stream;
trackHolder->bitsPerSample = bitsPerSample;
trackHolder->channelCount = channelCount;
trackHolder->bufferLength =
trackHolder->channelCount * AAudioStream_getBufferSizeInFrames(stream);
trackHolder->buffer = new float[trackHolder->bufferLength]();
#if (DUMP_PCM_DATA == TRUE)
outputPcmSampleFile = fopen(outputFilename, "ab");
#endif
return (void*)trackHolder;
}
void BtifAvrcpAudioTrackStart(void* handle) {
if (handle == NULL) {
LOG_ERROR("%s: handle is null!", __func__);
return;
}
BtifAvrcpAudioTrack* trackHolder = static_cast<BtifAvrcpAudioTrack*>(handle);
CHECK(trackHolder != NULL);
CHECK(trackHolder->stream != NULL);
LOG_VERBOSE("%s Track.cpp: btStartTrack", __func__);
AAudioStream_requestStart(trackHolder->stream);
}
void BtifAvrcpAudioTrackStop(void* handle) {
if (handle == NULL) {
LOG_INFO("%s handle is null.", __func__);
return;
}
BtifAvrcpAudioTrack* trackHolder = static_cast<BtifAvrcpAudioTrack*>(handle);
if (trackHolder != NULL && trackHolder->stream != NULL) {
LOG_VERBOSE("%s Track.cpp: btStartTrack", __func__);
AAudioStream_requestStop(trackHolder->stream);
}
}
void BtifAvrcpAudioTrackDelete(void* handle) {
if (handle == NULL) {
LOG_INFO("%s handle is null.", __func__);
return;
}
BtifAvrcpAudioTrack* trackHolder = static_cast<BtifAvrcpAudioTrack*>(handle);
if (trackHolder != NULL && trackHolder->stream != NULL) {
LOG_VERBOSE("%s Track.cpp: btStartTrack", __func__);
AAudioStream_close(trackHolder->stream);
delete trackHolder->buffer;
delete trackHolder;
}
#if (DUMP_PCM_DATA == TRUE)
if (outputPcmSampleFile) {
fclose(outputPcmSampleFile);
}
outputPcmSampleFile = NULL;
#endif
}
void BtifAvrcpAudioTrackPause(void* handle) {
if (handle == NULL) {
LOG_INFO("%s handle is null.", __func__);
return;
}
BtifAvrcpAudioTrack* trackHolder = static_cast<BtifAvrcpAudioTrack*>(handle);
if (trackHolder != NULL && trackHolder->stream != NULL) {
LOG_VERBOSE("%s Track.cpp: btPauseTrack", __func__);
AAudioStream_requestPause(trackHolder->stream);
AAudioStream_requestFlush(trackHolder->stream);
}
}
void BtifAvrcpSetAudioTrackGain(void* handle, float gain) {
if (handle == NULL) {
LOG_INFO("%s handle is null.", __func__);
return;
}
// Does nothing right now
}
constexpr float kScaleQ15ToFloat = 1.0f / 32768.0f;
constexpr float kScaleQ23ToFloat = 1.0f / 8388608.0f;
constexpr float kScaleQ31ToFloat = 1.0f / 2147483648.0f;
static size_t sampleSizeFor(BtifAvrcpAudioTrack* trackHolder) {
return trackHolder->bitsPerSample / 8;
}
static size_t transcodeQ15ToFloat(uint8_t* buffer, size_t length,
BtifAvrcpAudioTrack* trackHolder) {
size_t sampleSize = sampleSizeFor(trackHolder);
size_t i = 0;
for (; i <= length / sampleSize; i++) {
trackHolder->buffer[i] = ((int16_t*)buffer)[i] * kScaleQ15ToFloat;
}
return i * sampleSize;
}
static size_t transcodeQ23ToFloat(uint8_t* buffer, size_t length,
BtifAvrcpAudioTrack* trackHolder) {
size_t sampleSize = sampleSizeFor(trackHolder);
size_t i = 0;
for (; i <= length / sampleSize; i++) {
size_t offset = i * sampleSize;
int32_t sample = *((int32_t*)(buffer + offset - 1)) & 0x00FFFFFF;
trackHolder->buffer[i] = sample * kScaleQ23ToFloat;
}
return i * sampleSize;
}
static size_t transcodeQ31ToFloat(uint8_t* buffer, size_t length,
BtifAvrcpAudioTrack* trackHolder) {
size_t sampleSize = sampleSizeFor(trackHolder);
size_t i = 0;
for (; i <= length / sampleSize; i++) {
trackHolder->buffer[i] = ((int32_t*)buffer)[i] * kScaleQ31ToFloat;
}
return i * sampleSize;
}
static size_t transcodeToPcmFloat(uint8_t* buffer, size_t length,
BtifAvrcpAudioTrack* trackHolder) {
switch (trackHolder->bitsPerSample) {
case 16:
return transcodeQ15ToFloat(buffer, length, trackHolder);
case 24:
return transcodeQ23ToFloat(buffer, length, trackHolder);
case 32:
return transcodeQ31ToFloat(buffer, length, trackHolder);
}
return -1;
}
constexpr int64_t kTimeoutNanos = 100 * 1000 * 1000; // 100 ms
int BtifAvrcpAudioTrackWriteData(void* handle, void* audioBuffer,
int bufferLength) {
BtifAvrcpAudioTrack* trackHolder = static_cast<BtifAvrcpAudioTrack*>(handle);
CHECK(trackHolder != NULL);
CHECK(trackHolder->stream != NULL);
aaudio_result_t retval = -1;
#if (DUMP_PCM_DATA == TRUE)
if (outputPcmSampleFile) {
fwrite((audioBuffer), 1, (size_t)bufferLength, outputPcmSampleFile);
}
#endif
size_t sampleSize = sampleSizeFor(trackHolder);
int transcodedCount = 0;
do {
transcodedCount +=
transcodeToPcmFloat(((uint8_t*)audioBuffer) + transcodedCount,
bufferLength - transcodedCount, trackHolder);
retval = AAudioStream_write(
trackHolder->stream, trackHolder->buffer,
transcodedCount / (sampleSize * trackHolder->channelCount),
kTimeoutNanos);
LOG_VERBOSE("%s Track.cpp: btWriteData len = %d ret = %d", __func__,
bufferLength, retval);
} while (transcodedCount < bufferLength);
return transcodedCount;
}
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