//
//  playAudio.m
//  myhome
//
//  Created by user on 12-11-20.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "playAudio.h" 
#import "AppDelegate.h"

#define SAMPLE_RATE             (8000)
#define WEBRTC_AUDIO_BUF_SIZE   (160*3*2)   //30ms (10ms=160samples)

@implementation playAudio {
    AppDelegate * app;
}

@synthesize Abuf;
@synthesize Abuf_p;
@synthesize Abuf_len;
@synthesize Version;
@synthesize vol;

static int BYTES_PER_SAMPLES;
static bool isAudioStop;

- (id)init {
    Abuf_p = 0;
    Abuf_len = 0;
    Abuf = (Byte*)malloc(ABUF_NUM * 64);
    if ( self = [super init] ) {
        
    }
    return self;
}

/* max number of samples per frame (= 60 ms frame) */

//回调  每当一组音频数据读取完毕之后会自动触发回调方法，读取下一帧数据
void buffer_callback(void *inUserData, AudioQueueRef q, AudioQueueBufferRef buf) {
     //__bridge
    //NSLog(@"buffer_callback");
    playAudio* player = (__bridge playAudio*)inUserData;
    [player audioQueueOutputWithQueue:q queueBuffer:buf];
}

- (short)G711Decode_u_law_2_linear:(Byte)b {
    //u律 8126
    short t;
    b = ~b;
    t = ((b&0xf)<<3)+0x84;
    t <<= ((unsigned)b&0x70)>>4;
    return ((b&0x80)?(0x84-t):(t-0x84));
}

- (short)G711Decode_a_law_2_linear:(Byte)b {
    //a律 8300
    int t;
    int seg;
    b ^= 0x55;
    t = (b&0xf)<<4;
    seg = ((unsigned)b&0x70)>>4;//seg=((unsigned)b&0x70)>>4;
    switch (seg){
        case 0:{
            t += 8;
        }
            break;
        case 1:{
            t += 0x108;
        }
            break;
        default:{
            t += 0x108;
            t <<= seg-1;
        }
            break;
    }
    return ((b&0x80)?t:-t);
}

- (void)audioQueueOutputWithQueue:(AudioQueueRef)q queueBuffer:(AudioQueueBufferRef)buf {
    //NSLog(@"audioQueueOutputWithQueue: _AudiodecodeType = %d", _AudiodecodeType);
    if (_AudiodecodeType == k711) {
        buf->mAudioDataByteSize = BYTES_PER_SAMPLES;
        short *b = buf->mAudioData;
        if (Abuf_len>0) {
            //NSLog(@"8130 audio play ...");
            int pos = Abuf_p*64;
            for (int i=0; i<BYTES_PER_SAMPLES/2; i++) {
                b[i] = [self G711Decode_u_law_2_linear:Abuf[pos+i]];

            }
            Abuf_len --;
            Abuf_p=(Abuf_p+1)%100;
        
        }
        else {
            for (int i=0; i<BYTES_PER_SAMPLES/2; i++) {
                b[i] = 0;
            }
        }
    }
 

    if (isAudioStop == NO && (!app.TalkSendAudio) ) {//因为在停止播放的过程中，buffer_callback还在被调用
        int ret = AudioQueueEnqueueBuffer(q, buf, 0, NULL);
        if (ret) {
            NSLog(@"enqueue error:%d", ret);
        }
    }
    
}

- (void)AudioPlayStartWithMode:(int)mod {
    NSLog(@"AudioPlayStartWithMode mod = %d", mod);
    app = (AppDelegate *)[[UIApplication sharedApplication]delegate];
    int channels = 1;//default 1
    Abuf_p = 0;
    Abuf_len = 0;
    isAudioStop = NO;
 
    _AudiodecodeType = k711;
    Abuf = malloc(64*ABUF_NUM);
    BYTES_PER_SAMPLES = 64 * 2 * channels;
        
 
    
    dataformat.mFormatID = kAudioFormatLinearPCM;
    dataformat.mSampleRate = SAMPLE_RATE;
    dataformat.mBitsPerChannel = 16;
    dataformat.mChannelsPerFrame = 1;
    dataformat.mFramesPerPacket = 1;
    dataformat.mBytesPerFrame = (dataformat.mBitsPerChannel / 8) * dataformat.mChannelsPerFrame;
    dataformat.mBytesPerPacket = dataformat.mBytesPerFrame * dataformat.mFramesPerPacket;
    dataformat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
    
    AudioQueueNewOutput(&dataformat, buffer_callback, (__bridge void *)(self), NULL, kCFRunLoopCommonModes, 0, &queue);
    AudioQueueSetParameter(queue, kAudioQueueParam_Volume, 1.0);
    
    unsigned int err;
    for (int i=0; i<NUM_BUFFERS; i++) {
        err = AudioQueueAllocateBuffer(queue, BYTES_PER_SAMPLES, &buffers[i]);
        
        
        [self audioQueueOutputWithQueue:queue queueBuffer:buffers[i]];
    }
    
    AudioQueueStart(queue, NULL);
    
}

- (int)AudioStartWithRate:(int)rate setChannels:(int)channels setSamples:(int)samples setBuf_samples:(int)buf_samples setVersion:(int)v {
    app = (AppDelegate *)[[UIApplication sharedApplication]delegate];
    
    //added by huangkanghui at 2016.05.25
    //Version = 8130;
    _AudiodecodeType = kIsac;
    Abuf_p = 0;
    Abuf_len = 0;
    //Abuf = malloc(64*ABUF_NUM);
    Abuf = malloc(160*ABUF_NUM);
    
    BYTES_PER_SAMPLES = buf_samples * 2 * channels;
    dataformat.mFormatID = kAudioFormatLinearPCM;
    dataformat.mSampleRate = 8000;//16000;//rate;//8000.0;
    dataformat.mBitsPerChannel = 16;
    dataformat.mChannelsPerFrame = 1;
    dataformat.mFramesPerPacket = 1;
    dataformat.mBytesPerFrame = (dataformat.mBitsPerChannel / 8) * dataformat.mChannelsPerFrame;
    dataformat.mBytesPerPacket = dataformat.mBytesPerFrame * dataformat.mFramesPerPacket;
    dataformat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;
    /*BYTES_PER_SAMPLES = buf_samples * 2 * channels;
    
    dataformat.mSampleRate = rate;
    dataformat.mFormatID = kAudioFormatLinearPCM; 
    dataformat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked; 
    dataformat.mBytesPerPacket = BYTES_PER_SAMPLES; 
    dataformat.mFramesPerPacket = buf_samples; 
    dataformat.mBytesPerFrame = 2*channels; 
    dataformat.mChannelsPerFrame = channels; 
    dataformat.mBitsPerChannel = 16; */
    NSLog(@"aoutinit1:%d:%d:%d:%d", rate, channels, samples, buf_samples);
    
    unsigned int err = AudioQueueNewOutput(&dataformat, buffer_callback, (__bridge void *)(self), NULL, kCFRunLoopCommonModes, 0, &queue);
    if (err) {
        //NSLog(@"AudioQueueNewOutput error");
        return -1; 
    } 
    AudioQueueSetParameter(queue, kAudioQueueParam_Volume, 1.0);
    
    int i; 
    for (i=0; i<NUM_BUFFERS; i++) {
        //err = AudioQueueAllocateBuffer(queue, BYTES_PER_SAMPLES, &buffers[i]);
        err = AudioQueueAllocateBuffer(queue, WEBRTC_AUDIO_BUF_SIZE, &buffers[i]);
        if (err) {
            return -2;
        }
        [self audioQueueOutputWithQueue:queue queueBuffer:buffers[i]];
    }
    
    AudioQueueStart(queue, NULL);

    return 0; 
}

- (void)setVolume:(float)v {
    NSLog(@"setv:%.2f", v);
    //vol=v;
    AudioQueueSetParameter(queue, kAudioQueueParam_Volume, (int)v);
}

- (void)AudioEnd {
    //unsigned int err = AudioQueueStop(queue, NULL);
    isAudioStop = YES;
    unsigned int err = AudioQueueStop(queue, TRUE);
    Abuf_p = 0;
    Abuf_len = 0;
    for (NSInteger i = 0; i < NUM_BUFFERS; i++) {
        AudioQueueFreeBuffer(queue, buffers[i]);
    }
    AudioQueueDispose(queue, TRUE);
    free(Abuf);
    if(err){ 
        NSLog(@"AudioQueue1End error");
    }
    //NSLog(@"playAudioEnd ...");
}

+ (void)initAudioSession {
    //AudioSessionInitialize(NULL, NULL, interruptionListener, (__bridge void *)(self));
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
    [[AVAudioSession sharedInstance] setActive:YES error:nil];
    
    NSError *err;
    [[AVAudioSession sharedInstance] setActive:TRUE error:&err];
}


@end