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Diffstat (limited to 'Samples/CommonSrc/Platform/OSX_WavPlayer.cpp')
| -rw-r--r-- | Samples/CommonSrc/Platform/OSX_WavPlayer.cpp | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/Samples/CommonSrc/Platform/OSX_WavPlayer.cpp b/Samples/CommonSrc/Platform/OSX_WavPlayer.cpp new file mode 100644 index 0000000..8b4c744 --- /dev/null +++ b/Samples/CommonSrc/Platform/OSX_WavPlayer.cpp @@ -0,0 +1,250 @@ +/************************************************************************************ + +Filename : WavPlayer_OSX.cpp +Content : An Apple OSX audio handler. +Created : March 5, 2013 +Authors : Robotic Arm Software - Peter Hoff, Dan Goodman, Bryan Croteau + +Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved. + +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. + +************************************************************************************/ + +#include "OSX_WavPlayer.h" + +namespace OVR { namespace OvrPlatform { namespace OSX { + +WavPlayer::WavPlayer(const char* fileName) +{ + FileName = fileName; +} + +bool WavPlayer::isDataChunk(unsigned char* buffer, int index) +{ + unsigned char a = buffer[index]; + unsigned char b = buffer[index + 1]; + unsigned char c = buffer[index + 2]; + unsigned char d = buffer[index + 3]; + return (a == 'D' || a == 'd') && (b == 'A' || b == 'a') && + (c == 'T' || c == 't') && (d == 'A' || d == 'a'); +} + +int WavPlayer::getWord(unsigned char* buffer, int index) +{ + unsigned char a = buffer[index]; + unsigned char b = buffer[index + 1]; + unsigned char c = buffer[index + 2]; + unsigned char d = buffer[index + 3]; + int result = 0; + result |= a; + result |= b << 8; + result |= c << 16; + result |= d << 24; + return result; +} + +short WavPlayer::getHalf(unsigned char* buffer, int index) +{ + unsigned char a = buffer[index]; + unsigned char b = buffer[index + 1]; + short result = 0; + result |= a; + result |= b << 8; + return result; +} + +void *WavPlayer::LoadPCM(const char *filename, unsigned long *len) +{ + FILE *file; + struct stat s; + void *pcm; + + if(stat(filename, &s)) + { + return NULL; + } + *len = s.st_size; + pcm = (void *) malloc(s.st_size); + if(!pcm) + { + return NULL; + } + file = fopen(filename, "rb"); + if(!file) + { + free(pcm); + return NULL; + } + fread(pcm, s.st_size, 1, file); + fclose(file); + return pcm; +} + +int WavPlayer::PlayBuffer(void *pcmbuffer, unsigned long len) +{ + AQCallbackStruct aqc; + UInt32 err, bufferSize; + int i; + + aqc.DataFormat.mSampleRate = SampleRate; + aqc.DataFormat.mFormatID = kAudioFormatLinearPCM; + if(BitsPerSample == 16) + { + aqc.DataFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger + | kAudioFormatFlagIsPacked; + } + aqc.DataFormat.mBytesPerPacket = NumChannels * (BitsPerSample / 8); + aqc.DataFormat.mFramesPerPacket = 1; + aqc.DataFormat.mBytesPerFrame = NumChannels * (BitsPerSample / 8); + aqc.DataFormat.mChannelsPerFrame = NumChannels; + aqc.DataFormat.mBitsPerChannel = BitsPerSample; + aqc.FrameCount = SampleRate / 60; + aqc.SampleLen = (UInt32)(len); + aqc.PlayPtr = 0; + aqc.PCMBuffer = static_cast<unsigned char*>(pcmbuffer); + + err = AudioQueueNewOutput(&aqc.DataFormat, + aqBufferCallback, + &aqc, + NULL, + kCFRunLoopCommonModes, + 0, + &aqc.Queue); + if(err) + { + return err; + } + + aqc.FrameCount = SampleRate / 60; + bufferSize = aqc.FrameCount * aqc.DataFormat.mBytesPerPacket; + + for(i = 0; i < AUDIO_BUFFERS; i++) + { + err = AudioQueueAllocateBuffer(aqc.Queue, bufferSize, + &aqc.Buffers[i]); + if(err) + { + return err; + } + aqBufferCallback(&aqc, aqc.Queue, aqc.Buffers[i]); + } + + err = AudioQueueStart(aqc.Queue, NULL); + if(err) + { + return err; + } + + while(true) + { + } + sleep(1); + return 0; +} + +void WavPlayer::aqBufferCallback(void *in, AudioQueueRef inQ, AudioQueueBufferRef outQB) +{ + AQCallbackStruct *aqc; + unsigned char *coreAudioBuffer; + + aqc = (AQCallbackStruct *) in; + coreAudioBuffer = (unsigned char*) outQB->mAudioData; + + printf("Sync: %u / %u\n", aqc->PlayPtr, aqc->SampleLen); + + if(aqc->FrameCount > 0) + { + outQB->mAudioDataByteSize = aqc->DataFormat.mBytesPerFrame * aqc->FrameCount; + for(int i = 0; i < aqc->FrameCount * aqc->DataFormat.mBytesPerFrame; i++) + { + if(aqc->PlayPtr > aqc->SampleLen) + { + aqc->PlayPtr = 0; + i = 0; + } + coreAudioBuffer[i] = aqc->PCMBuffer[aqc->PlayPtr]; + aqc->PlayPtr++; + } + AudioQueueEnqueueBuffer(inQ, outQB, 0, NULL); + } +} + +int WavPlayer::PlayAudio() +{ + unsigned long len; + void *pcmbuffer; + int ret; + + pcmbuffer = LoadPCM(FileName, &len); + if(!pcmbuffer) + { + fprintf(stderr, "%s: %s\n", FileName, strerror(errno)); + exit(EXIT_FAILURE); + } + + unsigned char* bytes = (unsigned char*)pcmbuffer; + int index = 0; + + // 'RIFF' + getWord(bytes, index); + index += 4; + // int Length + getWord(bytes, index); + index += 4; + // 'WAVE' + getWord(bytes, index); + index += 4; + // 'fmt ' + getWord(bytes, index); + index += 4; + + // int Format Length + int fmtLen = getWord(bytes, index); + index += 4; + AudioFormat = getHalf(bytes, index); + index += 2; + NumChannels = getHalf(bytes, index); + index += 2; + SampleRate = getWord(bytes, index); + index += 4; + ByteRate = getWord(bytes, index); + index += 4; + BlockAlign = getHalf(bytes, index); + index += 2; + BitsPerSample = getHalf(bytes, index); + index += 2; + index += fmtLen - 16; + while(!isDataChunk(bytes, index)) + { + // Any Chunk + getWord(bytes, index); + index += 4; + // Any Chunk Length + int anyChunkLen = getWord(bytes, index); + index += 4 + anyChunkLen; + } + // 'data' + getWord(bytes, index); + index += 4; + // int Data Length + unsigned long dataLen = getWord(bytes, index); + index += 4; + unsigned char* target = &bytes[index]; + + ret = PlayBuffer((void *)target, dataLen); + free(pcmbuffer); + return ret; +} + +}}} |