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 <audio_utils/primitives.h>
19 #include <utils/Log.h>
20 #include "AudioMixer.h"
21 #include "VideoEditorResampler.h"
22
23 namespace android {
24
25 struct VideoEditorResampler : public AudioBufferProvider {
26
27 public:
28
29 virtual status_t getNextBuffer(Buffer* buffer, int64_t pts);
30 virtual void releaseBuffer(Buffer* buffer);
31
32 enum { //Sampling freq
33 kFreq8000Hz = 8000,
34 kFreq11025Hz = 11025,
35 kFreq12000Hz = 12000,
36 kFreq16000Hz = 16000,
37 kFreq22050Hz = 22050,
38 kFreq24000Hz = 24000,
39 kFreq32000Hz = 32000,
40 kFreq44100 = 44100,
41 kFreq48000 = 48000,
42 };
43
44 AudioResampler *mResampler;
45 int16_t* mInput;
46 int nbChannels;
47 int nbSamples;
48 M4OSA_Int32 outSamplingRate;
49 M4OSA_Int32 inSamplingRate;
50
51 int16_t *mTmpInBuffer;
52 };
53
54 #define MAX_SAMPLEDURATION_FOR_CONVERTION 40 //ms
55
getNextBuffer(AudioBufferProvider::Buffer * pBuffer,int64_t pts)56 status_t VideoEditorResampler::getNextBuffer(AudioBufferProvider::Buffer *pBuffer, int64_t pts) {
57
58 uint32_t dataSize = pBuffer->frameCount * this->nbChannels * sizeof(int16_t);
59 mTmpInBuffer = (int16_t*)malloc(dataSize);
60 memcpy(mTmpInBuffer, this->mInput, dataSize);
61 pBuffer->raw = (void*)mTmpInBuffer;
62
63 return OK;
64 }
65
releaseBuffer(AudioBufferProvider::Buffer * pBuffer)66 void VideoEditorResampler::releaseBuffer(AudioBufferProvider::Buffer *pBuffer) {
67
68 if(pBuffer->raw != NULL) {
69 free(pBuffer->raw);
70 pBuffer->raw = NULL;
71 mTmpInBuffer = NULL;
72 }
73 pBuffer->frameCount = 0;
74 }
75
76 extern "C" {
77
LVAudioResamplerCreate(M4OSA_Int32 bitDepth,M4OSA_Int32 inChannelCount,M4OSA_Int32 sampleRate,M4OSA_Int32 quality)78 M4OSA_Context LVAudioResamplerCreate(M4OSA_Int32 bitDepth, M4OSA_Int32 inChannelCount,
79 M4OSA_Int32 sampleRate, M4OSA_Int32 quality) {
80
81 VideoEditorResampler *context = new VideoEditorResampler();
82 context->mResampler = AudioResampler::create(
83 bitDepth, inChannelCount, sampleRate);
84 if (context->mResampler == NULL) {
85 return NULL;
86 }
87 context->mResampler->setSampleRate(android::VideoEditorResampler::kFreq32000Hz);
88 context->mResampler->setVolume(0x1000, 0x1000);
89 context->nbChannels = inChannelCount;
90 context->outSamplingRate = sampleRate;
91 context->mInput = NULL;
92 context->mTmpInBuffer = NULL;
93
94 return ((M4OSA_Context )context);
95 }
96
97
LVAudiosetSampleRate(M4OSA_Context resamplerContext,M4OSA_Int32 inSampleRate)98 void LVAudiosetSampleRate(M4OSA_Context resamplerContext, M4OSA_Int32 inSampleRate) {
99
100 VideoEditorResampler *context =
101 (VideoEditorResampler *)resamplerContext;
102 context->mResampler->setSampleRate(inSampleRate);
103 /*
104 * nbSamples is calculated for 40ms worth of data;hence sample rate
105 * is used to calculate the nbSamples
106 */
107 context->inSamplingRate = inSampleRate;
108 // Allocate buffer for maximum allowed number of samples.
109 context->mInput = (int16_t*)malloc( (inSampleRate * MAX_SAMPLEDURATION_FOR_CONVERTION *
110 context->nbChannels * sizeof(int16_t)) / 1000);
111 }
112
LVAudiosetVolume(M4OSA_Context resamplerContext,M4OSA_Int16 left,M4OSA_Int16 right)113 void LVAudiosetVolume(M4OSA_Context resamplerContext, M4OSA_Int16 left, M4OSA_Int16 right) {
114
115 VideoEditorResampler *context =
116 (VideoEditorResampler *)resamplerContext;
117 context->mResampler->setVolume(left,right);
118 }
119
LVDestroy(M4OSA_Context resamplerContext)120 void LVDestroy(M4OSA_Context resamplerContext) {
121
122 VideoEditorResampler *context =
123 (VideoEditorResampler *)resamplerContext;
124
125 if (context->mTmpInBuffer != NULL) {
126 free(context->mTmpInBuffer);
127 context->mTmpInBuffer = NULL;
128 }
129
130 if (context->mInput != NULL) {
131 free(context->mInput);
132 context->mInput = NULL;
133 }
134
135 if (context->mResampler != NULL) {
136 delete context->mResampler;
137 context->mResampler = NULL;
138 }
139
140 if (context != NULL) {
141 delete context;
142 context = NULL;
143 }
144 }
145
LVAudioresample_LowQuality(M4OSA_Int16 * out,M4OSA_Int16 * input,M4OSA_Int32 outFrameCount,M4OSA_Context resamplerContext)146 void LVAudioresample_LowQuality(M4OSA_Int16* out, M4OSA_Int16* input,
147 M4OSA_Int32 outFrameCount, M4OSA_Context resamplerContext) {
148
149 VideoEditorResampler *context =
150 (VideoEditorResampler *)resamplerContext;
151 int32_t *pTmpBuffer = NULL;
152
153 context->nbSamples = (context->inSamplingRate * outFrameCount) / context->outSamplingRate;
154 memcpy(context->mInput,input,(context->nbSamples * context->nbChannels * sizeof(int16_t)));
155
156 /*
157 SRC module always gives stereo output, hence 2 for stereo audio
158 */
159 pTmpBuffer = (int32_t*)malloc(outFrameCount * 2 * sizeof(int32_t));
160 memset(pTmpBuffer, 0x00, outFrameCount * 2 * sizeof(int32_t));
161
162 context->mResampler->resample((int32_t *)pTmpBuffer,
163 (size_t)outFrameCount, (VideoEditorResampler *)resamplerContext);
164 // Convert back to 16 bits
165 ditherAndClamp((int32_t*)out, pTmpBuffer, outFrameCount);
166 free(pTmpBuffer);
167 pTmpBuffer = NULL;
168 }
169
170 }
171
172 } //namespace android
173