AudioToolbox－－AudioQueue实现流播放接口

AudioMedia_ios.h

//
//  AudioMedia_ios.h
//  mmsplayer
//
//  Created by Weiny on 12-4-4.
//  Copyright (c) 2012年 Weiny Zhou. All rights reserved.
//

#ifndef mmsplayer_AudioMedia_ios_h
#define mmsplayer_AudioMedia_ios_h
#include "wdef.h"

typedef void* wAudio;

#ifdef __cplusplus
extern "C"
{
#endif
    wAudio audio_open(int sample,int nchannles,int bits,int nFrameSize);//初始化声音接口
    int audio_play(wAudio audio);//播放
    int audio_pause(wAudio audio);
    int audio_wirte(wAudio audio,unsigned char* pcm,size_t count,int64_t dts);//写入音频数据
    int audio_stop(wAudio audio);//停止
    int audio_close(wAudio audio);//关闭
#ifdef __cplusplus
};
#endif

#endif

AudioMedia_ios.c

//
//  AudioMedia_ios.cpp
//  mmsplayer
//
//  Created by Weiny on 12-4-4.
//  Copyright (c) 2012年 Weiny Zhou. All rights reserved.
//

#include "AudioMedia_ios.h"
#include <AudioToolbox/AudioQueue.h>
#include "system/thread.h"
#include "base/wlist.h"
#include "system/lx_lock.h"
#define AUDIO_LIST_COUNT 3
#define AUDIO_BUFFER_SECONDS  1
typedef struct WAudio_Ios
{

    int playRequested;
    int framesize;
    Wlock mlock,mdecdonelock,mqueuelock;
    wlist_t mAudiolist;//声音队列
    wlist_func mlistfunc;

    AudioQueueRef queue;//player list
    AudioQueueBufferRef mBuffers[AUDIO_LIST_COUNT];
    AudioStreamBasicDescription mDataFormat;
    AudioQueueBufferRef emptyAudioBuffer;//空音频队列

}WAudio_Ios;
typedef struct
{
    void* data;
    size_t size;
    int64_t dst;
}WAudio_item;

void wAudio_CallBack(void * in,AudioQueueRef intq,AudioQueueBufferRef outQB);
void wAudtio_fillAudioBuffer(WAudio_Ios* audio,AudioQueueBufferRef buffer);
static inline void waudio_free_back(void* lpvoid,wlist_item_ptr data)
{
    WAudio_item* item;
    INTOFUNC();
    if(!data){PRINTF_ERROR_VALUE(ERROR_INITPARAM);goto error_lab;}
    item=(WAudio_item*)data;
    SAFE_FREE(item->data);
    SAFE_FREE(item);
error_lab:
    EXITFUNC();
}
wAudio audio_open(int sample,int nchannles,int bits,int nFrameSize)
{
    WAudio_Ios* ptr=NULL;
    uint32_t err=0;
    int i=0;
    INTOFUNC();
    ptr=WOS_MALLOC_(WAudio_Ios, 1);
    if(!ptr){
        PRINTF_ERROR_VALUE(ERROR_NEWMEM);
        goto error_lab;
    }
    memset(ptr,0,sizeof(WAudio_Ios));
    ptr->mDataFormat.mSampleRate=sample;//设置采样率
    ptr->mDataFormat.mChannelsPerFrame=nchannles;
    ptr->mDataFormat.mBitsPerChannel=bits;
    ptr->mDataFormat.mFormatID=kAudioFormatLinearPCM;//设置数据格式
    ptr->mDataFormat.mFormatFlags=kLinearPCMFormatFlagIsSignedInteger|kAudioFormatFlagIsPacked;

    ptr->mDataFormat.mFramesPerPacket=1;
    ptr->mDataFormat.mBytesPerFrame=
        ptr->mDataFormat.mBitsPerChannel/
        ptr->mDataFormat.mChannelsPerFrame;
     ptr->mDataFormat.mBytesPerPacket=
         ptr->mDataFormat.mBytesPerFrame*ptr->mDataFormat.
         mFramesPerPacket;

    err=AudioQueueNewOutput(&ptr->mDataFormat,wAudio_CallBack, ptr, NULL,
                            NULL/*kCFRunLoopCommonModes*/, 0
                            , &ptr->queue);
    if(err){
        WERROR_A("init audio output error,sample=%d,channles=%d,bits=%d.
",sample,nchannles,bits);
        goto error_lab;
    }
    for (i=0;i<AUDIO_LIST_COUNT;++i)
    {
        err=AudioQueueAllocateBufferWithPacketDescriptions(ptr->queue,
            bits*AUDIO_BUFFER_SECONDS/8,
            sample*AUDIO_BUFFER_SECONDS/nFrameSize+1,ptr->mBuffers+i);
        if(err){
            WERROR_A("can't allocate audio queue buffer: %d",err);

            goto error_lab;
        }
    }
    ptr->mlock=lx_lock_init();
    ptr->mdecdonelock=lx_lock_init();
    ptr->mqueuelock=lx_lock_init();
    ptr->mlistfunc=wlist_getfunc();
    ptr->mAudiolist.free=waudio_free_back;
    ptr->framesize=nFrameSize;
#if 1
    err=AudioQueueStart(ptr->queue,NULL);
    if(err){
        WERROR_A("Error: Audio queue failed to start: %d", err);
        goto error_lab;
    }
    ptr->playRequested=1;
    WDEBUG_OUT("Started Audio queue.",NULL);
#endif
#if 0
    agc.FrameCount = FRAME_COUNT;
    bufferSize = agc.FrameCount * agc.mDataFormat.mBytesPerFrame;
    for (i=0; i<AUDIO_BUFFERS; i++)
    {
        err = AudioQueueAllocateBuffer(agc.queue,bufferSize,&agc.mBuffers[i]);
        if(err) return err;
        AQBufferCallback(&agc,agc.queue,agc.mBuffers[i]);
    }
    err = AudioQueueStart(agc.queue,NULL);
    if(err) return err;
    while (agc.playPtr<agc.sampleLen)
    {
        select(NULL,NULL,NULL,NULL,1.0);
    }
#endif
error_lab:
    if(err){
        audio_close(ptr);
        SAFE_FREE(ptr);
    }
    EXITFUNC();
    return (wAudio)ptr;
}
int audio_play(wAudio audio)
{
    int nResult=0;
    WAudio_Ios* ptr=NULL;
    INTOFUNC();
    if(!audio){
        WERROR_A("input audio is null",NULL);
        nResult=ERROR_INITPARAM;
        goto error_lab;
    }
    ptr=(WAudio_Ios*)audio;
    if(ptr->playRequested==0||ptr->playRequested==2)
    {WERROR_A("state is %d",ptr->playRequested);goto error_lab;}
    ptr->playRequested=1;
    AudioQueueStart(ptr->queue,NULL);
error_lab:
    EXITFUNC();
    return nResult;
}
int audio_pause(wAudio audio)
{
    int nResult=0;
    WAudio_Ios* ptr=NULL;
    INTOFUNC();
    if(!audio){
        WERROR_A("input audio is null",NULL);
        nResult=ERROR_INITPARAM;
        goto error_lab;
    }
    ptr=(WAudio_Ios*)audio;
    if(1!=ptr->playRequested)
    {WERROR_A("state is %d",ptr->playRequested);goto error_lab;}
    ptr->playRequested=2;
    AudioQueuePause(ptr->queue);
error_lab:
    EXITFUNC();
    return nResult;
}
int audio_wirte(wAudio audio,unsigned char* pcm,size_t count,int64_t dst)
{
    int nResult=0;
    WAudio_Ios* ptr=NULL;
    WAudio_item* item=NULL;
    INTOFUNC();
    if(!audio){
        WERROR_A("input audio is null",NULL);
        nResult=ERROR_INITPARAM;
        goto error_lab;
    }
    ptr=(WAudio_Ios*)audio;
    item=WOS_MALLOC_(WAudio_item,1);
    if(!item){
        nResult=ERROR_NEWMEM;PRINTF_ERROR_VALUE(nResult);goto error_lab;
    }
    item->data=pcm;
    item->size=count;
    item->dst=dst;
    lx_lock(ptr->mqueuelock);
    //先加入队列
    ptr->mlistfunc.push_back(&ptr->mAudiolist,item);
    //
    if(ptr->emptyAudioBuffer)
        wAudtio_fillAudioBuffer(ptr,ptr->emptyAudioBuffer);//填充空buffer
    lx_unlock(ptr->mqueuelock);
error_lab:
    EXITFUNC();
    return nResult;
}
int audio_stop(wAudio audio)
{
    int nResult=0;
    WAudio_Ios* ptr=NULL;
    INTOFUNC();
    if(!audio){
        WERROR_A("input audio is null",NULL);
        nResult=ERROR_INITPARAM;
        goto error_lab;
    }
    ptr=(WAudio_Ios*)audio;
    AudioQueueStop(ptr->queue,false);
    ptr->playRequested=0;
error_lab:
    EXITFUNC();
    return nResult;
}
int audio_close(wAudio audio)
{
    int nResult=0;
    WAudio_Ios* ptr=NULL;
    INTOFUNC();
    if(!audio){
        WERROR_A("input audio is null.",NULL);
        nResult=ERROR_INITPARAM;
        goto error_lab;
    }
    ptr=(WAudio_Ios*)audio;
    ptr->mlistfunc.clear(&ptr->mAudiolist);//清空播放队列
    lx_lock_free(ptr->mqueuelock);
    lx_lock_free(ptr->mdecdonelock);
    lx_lock_free(ptr->mlock);
    AudioQueueDispose(ptr->queue,false);
    SAFE_FREE(ptr);
error_lab:
    EXITFUNC();
    return nResult;
}
#if 0
void AQBufferCallback( void *in, AudioQueueRef inQ, AudioQueueBufferRef outQB)
{
    AQCallbackStruct *agc;
    short *coreAudiobuffer;
    short sample;
    int i;
    agc=(AQCallbackStruct *) in;
    coreAudiobuffer ＝(short*) outQB->mAudioData;
    printf("Sync:%i / %i 
",agc->playPtr,agc->sampleLen);
    if (agc->FrameCount >0)
    {
        outQB->mAudioDataByteSize = 4*agc->FrameCount;
        for (i=0; i<agc->FrameCount*2; i++)
        {
            if(agc->playPtr > agc->sampleLen || agc->playPtr<0)
            {
                sample =0;
            }
            else
            {
                sample = (agc->pcmBuffer[agc->playPtr]);
            }
            coreAudiobuffer[i] = sample;
            coreAudiobuffer[i+1] = sample;
            agc->playPtr++;
        }
        AudioQueueEnqueueBuffer(inQ,outQB,0,NULL);
    }
}
#endif
void wAudtio_fillAudioBuffer(WAudio_Ios* audio,AudioQueueBufferRef buffer)
{
    AudioTimeStamp bufferStartTime;
    uint32_t err;
    INTOFUNC();
    buffer->mAudioDataByteSize=0;
    buffer->mPacketDescriptionCount=0;
    if(audio->mAudiolist.size<=0){
        WERROR_A("Warning: No audio packets in queue.",NULL);
        audio->emptyAudioBuffer=buffer;
        goto error_lab;
    }
    audio->emptyAudioBuffer=NULL;
    while(audio->mAudiolist.size&&buffer->mPacketDescriptionCount <
        buffer->mPacketDescriptionCapacity)
    {
        wlist_item* item=audio->mlistfunc.pop_front(&audio->mAudiolist);
        WAudio_item* data=(WAudio_item*)item->data;
        if(buffer->mAudioDataBytesCapacity -
            buffer->mAudioDataByteSize >=data->size)
        {
            if(buffer->mAudioDataBytesCapacity==0)
            {
                bufferStartTime.mSampleTime=data->dst*audio->framesize;
                bufferStartTime.mFlags=kAudioTimeStampSampleTimeValid;
            }
             memcpy((uint8_t *)buffer->mAudioData + buffer->mAudioDataByteSize, data->data, data->size);
             buffer->mPacketDescriptions[buffer->mPacketDescriptionCount].mStartOffset = buffer->mAudioDataByteSize;
             buffer->mPacketDescriptions[buffer->mPacketDescriptionCount].mDataByteSize = data->size;
             buffer->mPacketDescriptions[buffer->mPacketDescriptionCount].mVariableFramesInPacket = audio->framesize;

             buffer->mAudioDataByteSize += data->size;
             ++buffer->mPacketDescriptionCount;
             lx_lock(audio->mqueuelock);
             audio->mlistfunc.remove(&audio->mAudiolist,0);
             lx_unlock(audio->mqueuelock);
        }
        else
            break;
    }
    if(buffer->mPacketDescriptionCount>0)
    {
        if(err=AudioQueueEnqueueBufferWithParameters(audio->queue,
            buffer,0,NULL,0,0,0,NULL,&bufferStartTime,NULL))
            WERROR_A("Error enqueuing audio buffer: %d", err);
        //decodelock
        lx_lock(audio->mdecdonelock);
        if(!audio->playRequested&&audio->mAudiolist.size==0){
            if(err=AudioQueueStop(audio->queue,false))
                WERROR_A("Error: Failed to stop audio queue: %d", err);
            else
                WERROR_A("Stopped audio queue",NULL);
        }
        lx_unlock(audio->mdecdonelock);
        //decodeunlock
    }
error_lab:
    EXITFUNC();
}
void wAudio_CallBack(void * in,AudioQueueRef intq,AudioQueueBufferRef buffer)
{
    wAudtio_fillAudioBuffer((WAudio_Ios*)in,buffer);
}

来源：http://blog.csdn.net/tigerleap/article/details/7628105