实践linux, alsa下的speex 回声消除

前几天搞过win32下的speex AEC (http://blog.youkuaiyun.com/sunkwei/archive/2011/05/18/6429096.aspx), 很复杂, 今天尝试搞搞 alsa 下的, 发现很简单啊!!! 照例先贴上 audacity 的效果图:

 

 

代码很简单, 而且效果似乎比win32下好些.

 

因为代码很简单, 直接贴在这里得了

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <alloca.h> #include <math.h> #include <alsa/asoundlib.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <arpa/inet.h> #include <pthread.h> #include <assert.h> #include <speex/speex_echo.h> #include <speex/speex_preprocess.h> #include "util_cirbuf.h" #define SAVEFILE 1 #define LISTEN_PORT 7777 #define PERIOD_NUM 3 #define FRAMESIZE 160 static snd_pcm_uframes_t _period_size = 160; static unsigned int _period_bytes = 320; // sock static int _sock_listen = -1, _sock_sender = -1; static struct sockaddr_in _target; static char *_target_ip; // argv[1] // speex obj static SpeexEchoState *_speex_aec = 0; static SpeexPreprocessState *_speex_preprocess = 0; // snd obj static snd_pcm_t *_snd_capture = 0, *_snd_playback = 0; // fifo, 接收缓冲，录音缓冲，回放缓冲 static struct tea_cirbuf_t *_cbuf_recv = 0, *_cbuf_capture = 0, *_cbuf_playback = 0; // recv thread static void *_thread_recv (void *p) { /** recv udp data. and save into _cbuf_recv */ assert(_sock_listen != -1); assert(_cbuf_recv); while (1) { char buf[4096]; // 每个pcm包不可能超过 struct sockaddr_in from; socklen_t fromlen = sizeof(from); int rc = recvfrom(_sock_listen, buf, sizeof(buf), 0, (struct sockaddr*)&from, &fromlen); if (rc < 0) { fprintf(stderr, "%s: recvfrom err/n", __func__); exit(-1); } // chk _cbuf_recv if (util_cbuf_space(_cbuf_recv) &l