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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "DataConverter"
     19 
     20 #include "include/DataConverter.h"
     21 
     22 #include <audio_utils/primitives.h>
     23 
     24 #include <media/MediaCodecBuffer.h>
     25 #include <media/stagefright/foundation/ADebug.h>
     26 #include <media/stagefright/foundation/AUtils.h>
     27 
     28 namespace android {
     29 
     30 status_t DataConverter::convert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target) {
     31     CHECK(source->base() != target->base());
     32     size_t size = targetSize(source->size());
     33     status_t err = OK;
     34     if (size > target->capacity()) {
     35         ALOGE("data size (%zu) is greater than buffer capacity (%zu)",
     36                 size,          // this is the data received/to be converted
     37                 target->capacity()); // this is out buffer size
     38         err = FAILED_TRANSACTION;
     39     } else {
     40         err = safeConvert(source, target);
     41     }
     42     target->setRange(0, err == OK ? size : 0);
     43     return err;
     44 }
     45 
     46 status_t DataConverter::safeConvert(
     47         const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target) {
     48     memcpy(target->base(), source->data(), source->size());
     49     return OK;
     50 }
     51 
     52 size_t DataConverter::sourceSize(size_t targetSize) {
     53     return targetSize;
     54 }
     55 
     56 size_t DataConverter::targetSize(size_t sourceSize) {
     57     return sourceSize;
     58 }
     59 
     60 DataConverter::~DataConverter() { }
     61 
     62 
     63 size_t SampleConverterBase::sourceSize(size_t targetSize) {
     64     size_t numSamples = targetSize / mTargetSampleSize;
     65     if (numSamples > SIZE_MAX / mSourceSampleSize) {
     66         ALOGW("limiting source size due to overflow (%zu*%zu/%zu)",
     67                 targetSize, mSourceSampleSize, mTargetSampleSize);
     68         return SIZE_MAX;
     69     }
     70     return numSamples * mSourceSampleSize;
     71 }
     72 
     73 size_t SampleConverterBase::targetSize(size_t sourceSize) {
     74     // we round up on conversion
     75     size_t numSamples = divUp(sourceSize, (size_t)mSourceSampleSize);
     76     if (numSamples > SIZE_MAX / mTargetSampleSize) {
     77         ALOGW("limiting target size due to overflow (%zu*%zu/%zu)",
     78                 sourceSize, mTargetSampleSize, mSourceSampleSize);
     79         return SIZE_MAX;
     80     }
     81     return numSamples * mTargetSampleSize;
     82 }
     83 
     84 
     85 static size_t getAudioSampleSize(AudioEncoding e) {
     86     switch (e) {
     87         case kAudioEncodingPcm16bit: return 2;
     88         case kAudioEncodingPcm8bit:  return 1;
     89         case kAudioEncodingPcmFloat: return 4;
     90         default: return 0;
     91     }
     92 }
     93 
     94 
     95 // static
     96 AudioConverter* AudioConverter::Create(AudioEncoding source, AudioEncoding target) {
     97     uint32_t sourceSampleSize = getAudioSampleSize(source);
     98     uint32_t targetSampleSize = getAudioSampleSize(target);
     99     if (sourceSampleSize && targetSampleSize && sourceSampleSize != targetSampleSize) {
    100         return new AudioConverter(source, sourceSampleSize, target, targetSampleSize);
    101     }
    102     return NULL;
    103 }
    104 
    105 status_t AudioConverter::safeConvert(const sp<MediaCodecBuffer> &src, sp<MediaCodecBuffer> &tgt) {
    106     if (mTo == kAudioEncodingPcm8bit && mFrom == kAudioEncodingPcm16bit) {
    107         memcpy_to_u8_from_i16((uint8_t*)tgt->base(), (const int16_t*)src->data(), src->size() / 2);
    108     } else if (mTo == kAudioEncodingPcm8bit && mFrom == kAudioEncodingPcmFloat) {
    109         memcpy_to_u8_from_float((uint8_t*)tgt->base(), (const float*)src->data(), src->size() / 4);
    110     } else if (mTo == kAudioEncodingPcm16bit && mFrom == kAudioEncodingPcm8bit) {
    111         memcpy_to_i16_from_u8((int16_t*)tgt->base(), (const uint8_t*)src->data(), src->size());
    112     } else if (mTo == kAudioEncodingPcm16bit && mFrom == kAudioEncodingPcmFloat) {
    113         memcpy_to_i16_from_float((int16_t*)tgt->base(), (const float*)src->data(), src->size() / 4);
    114     } else if (mTo == kAudioEncodingPcmFloat && mFrom == kAudioEncodingPcm8bit) {
    115         memcpy_to_float_from_u8((float*)tgt->base(), (const uint8_t*)src->data(), src->size());
    116     } else if (mTo == kAudioEncodingPcmFloat && mFrom == kAudioEncodingPcm16bit) {
    117         memcpy_to_float_from_i16((float*)tgt->base(), (const int16_t*)src->data(), src->size() / 2);
    118     } else {
    119         return INVALID_OPERATION;
    120     }
    121     return OK;
    122 }
    123 
    124 } // namespace android
    125