啃论文俱乐部——移植Speexdsp到OpenHarmony标准系统（五）

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Copyright 2002-2008   Xiph.org Foundation
Copyright 2002-2008   Jean-Marc Valin
Copyright 2005-2007 Analog Devices Inc.
Copyright 2005-2008 Commonwealth Scientific and Industrial Research
                       Organisation (CSIRO)
Copyright 1993, 2002, 2006 David Rowe
Copyright 2003    EpicGames
Copyright 1992-1994 Jutta Degener, Carsten Bormann
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

wc -l *

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
//要使用重采样器，必须包含它的头文件speex_resampler.h:
#include "speex/speex_resampler.h"
//基本输入输出函数的声明
#include 
////头文件中声明了一些数学函数和宏
#include 

#include 
//NN定义的是帧长度
#define NN 256
int main()
{
   spx_uint32_t i;
   short *in;
   short *out;
   float *fin, *fout;
   int count = 0;
//对于每一个被重采样的流(流是一种抽象的概念,表示一连串的数据元素;流中的数据元素称为帧Frame。)，有必要创建一个重采样状态:SpeexResamplerState *resampler;
//resampler = speex_resampler_init(nb_channels, input_rate, output_rate, quality, &err);
// nb_channels声道数量，这段测试程序要求输入的音频声道数量为1
// input_rate和output_rate指的是输入音频的采样率和输出音频的采样率。
// err错误码


   SpeexResamplerState *st = speex_resampler_init(1, 8000, 12000, 10, NULL);

//96000是输入音频的采样率，44100是输出音频的采样率。单位为Hz
   speex_resampler_set_rate(st, 96000, 44100);
   speex_resampler_skip_zeros(st);
 
   in = malloc(NN*sizeof(short));
   out = malloc(2*NN*sizeof(short));
   fin = malloc(NN*sizeof(float));
   fout = malloc(2*NN*sizeof(float));
//while(1):这是一个死循环，一直在while里循环.
//调试代码时，为了检测一部分代码是否OK，可加测试点while(1),测试这段代码。
   while (1)
   {
      spx_uint32_t in_len;
      spx_uint32_t out_len;

      fread(in, sizeof(short), NN, stdin);
//feof()是检测流上的文件结束符的函数，如果文件结束，则返回非0值，否则返回0
      if (feof(stdin))
         break;
      for (i=0;i<NN;i++)
         fin[i]=in[i];
      in_len = NN;
      out_len = 2*NN;
      
//实际的重采样是使用speex_resampler_process_int(resampler, channelID, in, &in_length, out, &out_length);
//其中"channelID"是输入的音频的声道。对于单声道，使用0。也可以同时处理多个通道。
//其中"in"指针指向所选通道的输入缓冲区的第一个样本，输出指向输出的第一个样本。
//in_length和out_length分别指定输入和输出缓冲区的大小。
      speex_resampler_process_float(st, 0, fin, &in_len, fout, &out_len);
      for (i=0;i<out_len;i++)
         out[i]=floor(.5+fout[i]);
      

      fwrite(out, sizeof(short), out_len, stdout);
      count++;
   }
   speex_resampler_destroy(st);
//free函数接受一个指针，然后将指针指向的地址还给系统。（但它不会改变指针的指向，所以一般在free之后还要将指针置
   空，不然你的这个指针就会变成野指针）
//一般来说，malloc函数应该和free函数成对出现，防止向系统要的内存太多系统不高兴。
   free(in);
   free(out);
   free(fin);
   free(fout);
   return 0;
}

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif


#include "speex/speex_echo.h"

#include "speex/speex_preprocess.h"
#include 
//stdlib 头文件即standard library标准库头文件 
#include 
// sys/types.h中文名称为基本系统 数据类型。在应用程序源文件中包含  以访问 _LP64 和 _ILP32 的定义
#include  
//stat.h头文件，轻松获取文件属性
#include  
//fcntl.h相关函数 open，fcntl，shutdown，unlink，fclose
#include  
//NN是frame_size帧长度，TAIL是filter_length滤波器长度
#define NN 128
#define TAIL 1024 
//当你需要程序带参数地启动的时候，就用int main(int argc, char *argv[])
int main(int argc, char **argv) 
{
//FILE* 指针作为文件句柄，是文件访问的唯一标识，它由fopen函数创建，fopen打开文件成功，则返回一个有效的FILE*指针，否则返回空指针NULL //[nʌl]
   FILE *echo_fd, *ref_fd, *e_fd;
   short echo_buf[NN], ref_buf[NN], e_buf[NN];
   SpeexEchoState *st;
   SpeexPreprocessState *den;
//采样率为8000.单位为hz
   int sampleRate = 8000;
   if (argc != 4)
   {
      fprintf(stderr, "testecho mic_signal.sw speaker_signal.sw output.sw\n");
      exit(1);
   }
// fopen函数用于打开文件
   echo_fd = fopen(argv[2], "rb");
   ref_fd  = fopen(argv[1],  "rb");
   e_fd    = fopen(argv[3], "wb");
·
   st = speex_echo_state_init(NN, TAIL);
   den = speex_preprocess_state_init(NN, sampleRate);
   speex_echo_ctl(st, SPEEX_ECHO_SET_SAMPLING_RATE, &sampleRate);

   speex_preprocess_ctl(den, SPEEX_PREPROCESS_SET_ECHO_STATE, st);
   while (!feof(ref_fd) && !feof(echo_fd))
   {
      fread(ref_buf, sizeof(short), NN, ref_fd);
      fread(echo_buf, sizeof(short), NN, echo_fd);

      speex_echo_cancellation(st, ref_buf, echo_buf, e_buf);
      speex_preprocess_run(den, e_buf);
      fwrite(e_buf, sizeof(short), NN, e_fd);
   }
   speex_echo_state_destroy(st); 
//可以用以下方法消除回声抵消状态:speex_echo_state_destroy(echo_state);
   speex_preprocess_state_destroy(den);
// fclose(FILE *fp) 一般地，fclose(fp)应与fopen配对使用，特别是含有写方式的文件，若不关闭，可能会造成文件数据丢失。
   fclose(e_fd);
   fclose(echo_fd);
   fclose(ref_fd);
   return 0;
}

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
//使用预处理功能先#include "speex/speex_preprocess.h"
#include "speex/speex_preprocess.h"
#include 
//定义NN为160
#define NN 160
int main()
{
   short in[NN];
   int i;

   SpeexPreprocessState *st;
   int count=0;
   float f;

   st = speex_preprocess_state_init(NN, 8000);


   i=1; // i=1就是打开预处理器的降噪功能；i=2就是关闭降噪功能
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DENOISE, &i); 


   i=0; // 
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_AGC, &i);
   i=8000;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_AGC_LEVEL, &i);

//reverberation removal混响消除
   i=0;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DEREVERB, &i);
   f=.0;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DEREVERB_DECAY, &f);
   f=.0;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DEREVERB_LEVEL, &f);

   while (1)
   {
      int vad;
      
      fread(in, sizeof(short), NN, stdin);

      if (feof(stdin))
         break;

//fwrite和fread是以记录为单位的I/O函数，fread和fwrite函数一般用于二进制文件的输入输出。
      vad = speex_preprocess_run(st, in);
      
      fwrite(in, sizeof(short), NN, stdout);
      count++;
   }
//预处理器状态可以通过以下方式销毁:speex_preprocess_state_destroy(preprocess_state);
   speex_preprocess_state_destroy(st);
   return 0;
}

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "speex/speex_jitter.h"
#include 
union jbpdata {  

  unsigned int idx; 
//unsigned int是整数类型 ，存储大小为2 或 4 字节，值范围为0 到 65,535 或 0 到 4,294,967,295
//unsigned char的表示范围为0~255 此处定义了一个拥有四个元素的数组
  unsigned char data[4];
};

void synthIn(JitterBufferPacket *in, int idx, int span) {
  union jbpdata d;
  d.idx = idx;

  in->data = d.data;
  in->len = sizeof(d);
  in->timestamp = idx * 10;
  in->span = span * 10;
  in->sequence = idx;
  in->user_data = 0;
}
void jitterFill(JitterBuffer *jb) {
   char buffer[65536];
   JitterBufferPacket in, out;
   int i;
   out.data = buffer;
   jitter_buffer_reset(jb);
   for(i=0;i<100;++i) {
     synthIn(&in, i, 1);
     jitter_buffer_put(jb, &in);
     out.len = 65536;
     
    //如果从不同的线程调用jitter_buffer_put()和jitter_buffer_get()，那么需要使用互斥锁来保护jitter缓冲区状态。
     if (jitter_buffer_get(jb, &out, 10, NULL) != JITTER_BUFFER_OK) {
       printf("Fill test failed iteration %d\n", i);
     }
     if (out.timestamp != i * 10) {
       printf("Fill test expected %d got %d\n", i*10, out.timestamp);
     }

     jitter_buffer_tick(jb);
   }
}

int main()
{
   char buffer[65536];
   JitterBufferPacket in, out;
   int i;
   
   JitterBuffer *jb = jitter_buffer_init(10);
   out.data = buffer;
   
   jitterFill(jb);
   for(i=0;i<100;++i) {
     out.len = 65536;
     jitter_buffer_get(jb, &out, 10, NULL);
     jitter_buffer_tick(jb);
   }
   synthIn(&in, 100, 1);
   jitter_buffer_put(jb, &in);
   out.len = 65536;
   if (jitter_buffer_get(jb, &out, 10, NULL) != JITTER_BUFFER_OK) {
     printf("Failed frozen sender resynchronize\n");
   } else {
     printf("Frozen sender: Jitter %d\n", out.timestamp - 100*10);
   }
   return 0;
}

gcc testdenoise.c -L /home/jiajiahao/Desktop/speexdsp-SpeexDSP-1.2.1/build/lib -o testdenoise -I /home/jiajiahao/Desktop/speexdsp-SpeexDSP-1.2.1/include -lm -lspeexdsp

hdc_std shell               
mount -o remount,rw /     ## 重新加载系统为可读写
mkdir speexdsp              ## 创建speexdsp目录存放测试用例
exit                        ## 退出开发板系统

hdc_std file speexdsp.tar /speexdsp

hdc_std shell              ## 进入开发板系统
cd speexdsp
tar -xvf speexdsp.tar
cp libspeexdsp_share.z.so /system/lib64/ ## 将库文件拷贝系统目录

chmod 777 testresample
./testresample < input.pcm > output.pcm

chmod 777 testresample                  ## 添加可执行权限
./testresample < input.pcm > output.pcm

hdc_std file recv /speexdsp/output.pcm C:\Users\jjh\Desktop\

./testresample2 > output.pcm

./testresample2 > output.pcm

1000 0 1024 22 -> 1024 0                  
1100 0 1024 24 -> 1024 15
1200 0 1024 26 -> 926 26
1300 926 1122 31 -> 1048 31
1400 950 1098 33 -> 1032 33
...
...
...
127600 1024 1024 2723 -> 1024 2723
...
...
127900 1024 1024 2729 -> 1024 2729
128000 1024 1024 2731 -> 1024 2730

./testecho speaker.wav micin.wav testecho_output.wav

./testdenoise < input.pcm > output.pcm

./testjitter

Frozen sender: Jitter 0