1 /*
2 * Copyright (C) 2011 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 1
18 #include <utils/Log.h>
19 #include "AudioMixer.h"
20 #include "VideoEditorResampler.h"
21
22 namespace android {
23
24 struct VideoEditorResampler : public AudioBufferProvider {
25
26 public:
27
28 virtual status_t getNextBuffer(Buffer* buffer);
29 virtual void releaseBuffer(Buffer* buffer);
30
31 enum { //Sampling freq
32 kFreq8000Hz = 8000,
33 kFreq11025Hz = 11025,
34 kFreq12000Hz = 12000,
35 kFreq16000Hz = 16000,
36 kFreq22050Hz = 22050,
37 kFreq240000Hz = 24000,
38 kFreq32000Hz = 32000,
39 kFreq44100 = 44100,
40 kFreq48000 = 48000,
41 };
42
43 AudioResampler *mResampler;
44 int16_t* mInput;
45 int nbChannels;
46 int nbSamples;
47 M4OSA_Int32 outSamplingRate;
48 M4OSA_Int32 inSamplingRate;
49
50 int16_t *mTmpInBuffer;
51 };
52
53 #define MAX_SAMPLEDURATION_FOR_CONVERTION 40 //ms
54
getNextBuffer(AudioBufferProvider::Buffer * pBuffer)55 status_t VideoEditorResampler::getNextBuffer(AudioBufferProvider::Buffer *pBuffer) {
56
57 uint32_t dataSize = pBuffer->frameCount * this->nbChannels * sizeof(int16_t);
58 mTmpInBuffer = (int16_t*)malloc(dataSize);
59 memcpy(mTmpInBuffer, this->mInput, dataSize);
60 pBuffer->raw = (void*)mTmpInBuffer;
61
62 return OK;
63 }
64
releaseBuffer(AudioBufferProvider::Buffer * pBuffer)65 void VideoEditorResampler::releaseBuffer(AudioBufferProvider::Buffer *pBuffer) {
66
67 if(pBuffer->raw != NULL) {
68 free(pBuffer->raw);
69 pBuffer->raw = NULL;
70 mTmpInBuffer = NULL;
71 }
72 pBuffer->frameCount = 0;
73 }
74
75 extern "C" {
76
LVAudioResamplerCreate(M4OSA_Int32 bitDepth,M4OSA_Int32 inChannelCount,M4OSA_Int32 sampleRate,M4OSA_Int32 quality)77 M4OSA_Context LVAudioResamplerCreate(M4OSA_Int32 bitDepth, M4OSA_Int32 inChannelCount,
78 M4OSA_Int32 sampleRate, M4OSA_Int32 quality) {
79
80 VideoEditorResampler *context = new VideoEditorResampler();
81 context->mResampler = AudioResampler::create(
82 bitDepth, inChannelCount, sampleRate, AudioResampler::DEFAULT);
83 if (context->mResampler == NULL) {
84 return NULL;
85 }
86 context->mResampler->setSampleRate(android::VideoEditorResampler::kFreq32000Hz);
87 context->mResampler->setVolume(0x1000, 0x1000);
88 context->nbChannels = inChannelCount;
89 context->outSamplingRate = sampleRate;
90 context->mInput = NULL;
91 context->mTmpInBuffer = NULL;
92
93 return ((M4OSA_Context )context);
94 }
95
96
LVAudiosetSampleRate(M4OSA_Context resamplerContext,M4OSA_Int32 inSampleRate)97 void LVAudiosetSampleRate(M4OSA_Context resamplerContext, M4OSA_Int32 inSampleRate) {
98
99 VideoEditorResampler *context =
100 (VideoEditorResampler *)resamplerContext;
101 context->mResampler->setSampleRate(inSampleRate);
102 /*
103 * nbSamples is calculated for 40ms worth of data;hence sample rate
104 * is used to calculate the nbSamples
105 */
106 context->inSamplingRate = inSampleRate;
107 // Allocate buffer for maximum allowed number of samples.
108 context->mInput = (int16_t*)malloc( (inSampleRate * MAX_SAMPLEDURATION_FOR_CONVERTION *
109 context->nbChannels * sizeof(int16_t)) / 1000);
110 }
111
LVAudiosetVolume(M4OSA_Context resamplerContext,M4OSA_Int16 left,M4OSA_Int16 right)112 void LVAudiosetVolume(M4OSA_Context resamplerContext, M4OSA_Int16 left, M4OSA_Int16 right) {
113
114 VideoEditorResampler *context =
115 (VideoEditorResampler *)resamplerContext;
116 context->mResampler->setVolume(left,right);
117 }
118
LVDestroy(M4OSA_Context resamplerContext)119 void LVDestroy(M4OSA_Context resamplerContext) {
120
121 VideoEditorResampler *context =
122 (VideoEditorResampler *)resamplerContext;
123
124 if (context->mTmpInBuffer != NULL) {
125 free(context->mTmpInBuffer);
126 context->mTmpInBuffer = NULL;
127 }
128
129 if (context->mInput != NULL) {
130 free(context->mInput);
131 context->mInput = NULL;
132 }
133
134 if (context->mResampler != NULL) {
135 delete context->mResampler;
136 context->mResampler = NULL;
137 }
138
139 if (context != NULL) {
140 delete context;
141 context = NULL;
142 }
143 }
144
LVAudioresample_LowQuality(M4OSA_Int16 * out,M4OSA_Int16 * input,M4OSA_Int32 outFrameCount,M4OSA_Context resamplerContext)145 void LVAudioresample_LowQuality(M4OSA_Int16* out, M4OSA_Int16* input,
146 M4OSA_Int32 outFrameCount, M4OSA_Context resamplerContext) {
147
148 VideoEditorResampler *context =
149 (VideoEditorResampler *)resamplerContext;
150 int32_t *pTmpBuffer = NULL;
151
152 context->nbSamples = (context->inSamplingRate * outFrameCount) / context->outSamplingRate;
153 memcpy(context->mInput,input,(context->nbSamples * context->nbChannels * sizeof(int16_t)));
154
155 /*
156 SRC module always gives stereo output, hence 2 for stereo audio
157 */
158 pTmpBuffer = (int32_t*)malloc(outFrameCount * 2 * sizeof(int32_t));
159 memset(pTmpBuffer, 0x00, outFrameCount * 2 * sizeof(int32_t));
160
161 context->mResampler->resample((int32_t *)pTmpBuffer,
162 (size_t)outFrameCount, (VideoEditorResampler *)resamplerContext);
163 // Convert back to 16 bits
164 AudioMixer::ditherAndClamp((int32_t*)out, pTmpBuffer, outFrameCount);
165 free(pTmpBuffer);
166 pTmpBuffer = NULL;
167 }
168
169 }
170
171 } //namespace android
172