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#ifndef STAGEFRIGHT_DATACONVERTER_H_
18#define STAGEFRIGHT_DATACONVERTER_H_
19
20#include <utils/Errors.h>
21#include <utils/RefBase.h>
22
23#include <media/stagefright/MediaDefs.h>
24
25namespace android {
26
27class MediaCodecBuffer;
28
29// DataConverter base class, defaults to memcpy
30struct DataConverter : public RefBase {
31    virtual size_t sourceSize(size_t targetSize); // will clamp to SIZE_MAX
32    virtual size_t targetSize(size_t sourceSize); // will clamp to SIZE_MAX
33
34    status_t convert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target);
35    virtual ~DataConverter();
36
37protected:
38    virtual status_t safeConvert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target);
39};
40
41// SampleConverterBase uses a ratio to calculate the source and target sizes
42// based on source and target sample sizes.
43struct SampleConverterBase : public DataConverter {
44    virtual size_t sourceSize(size_t targetSize);
45    virtual size_t targetSize(size_t sourceSize);
46
47protected:
48    virtual status_t safeConvert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target) = 0;
49
50    // sourceSize = sourceSampleSize / targetSampleSize * targetSize
51    SampleConverterBase(uint32_t sourceSampleSize, uint32_t targetSampleSize)
52        : mSourceSampleSize(sourceSampleSize),
53          mTargetSampleSize(targetSampleSize) { }
54    size_t mSourceSampleSize;
55    size_t mTargetSampleSize;
56};
57
58// AudioConverter converts between audio PCM formats
59struct AudioConverter : public SampleConverterBase {
60    // return nullptr if conversion is not needed or not supported
61    static AudioConverter *Create(AudioEncoding source, AudioEncoding target);
62
63protected:
64    virtual status_t safeConvert(const sp<MediaCodecBuffer> &source, sp<MediaCodecBuffer> &target);
65
66private:
67    AudioConverter(
68            AudioEncoding source, size_t sourceSample,
69            AudioEncoding target, size_t targetSample)
70        : SampleConverterBase(sourceSample, targetSample),
71          mFrom(source),
72          mTo(target) { }
73    AudioEncoding mFrom;
74    AudioEncoding mTo;
75};
76
77} // namespace android
78
79#endif
80