牽著老婆滿街逛

嚴以律己,寬以待人. 三思而后行.
GMail/GTalk: yanglinbo#google.com;
MSN/Email: tx7do#yahoo.com.cn;
QQ: 3 0 3 3 9 6 9 2 0 .

統計

隨筆 - 1513
文章 - 45
評論 - 907
引用 - 0

公告

言論：
1.每日自省；
2.享受人生；
3.盡力而為；
4.堅持不懈；
5.切莫急躁；
6.慎言敏行；
7.動心忍性；
8.上善若水。

常用鏈接

留言簿(11)

隨筆分類(466)

隨筆檔案(1513)

文章分類(46)

文章檔案(45)

相冊

收藏夾(39)

搜索

積分與排名

積分 - 2522529
排名 - 2

閱讀排行榜

speex 的一個例子, 使用了SPEEX抖動緩存.

轉載自:http://blog.163.com/yuan_zhch/blog/static/193790046201172743047588/

http://svn.xiph.org/trunk/speex/speexclient/

/***************************************************************************

Organisation (CSIRO) Australia

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

PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

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.

****************************************************************************/

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdlib.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <netdb.h>

#include <stdio.h>

#include <unistd.h> /* close() */

#include <string.h> /* memset() */

#include "alsa_device.h"

#include <speex/speex.h>

#include <speex/speex_jitter.h>

#include <speex/speex_preprocess.h>

#include <speex/speex_echo.h>

#include "speex_jitter_buffer.h"

#include <sched.h>

#define MAX_MSG 1500

#define SAMPLING_RATE 16000

#define FRAME_SIZE 320

int main(int argc, char *argv[])

{

int sd, rc, n;

int i;

struct sockaddr_in cliAddr, remoteAddr;

char msg[MAX_MSG];

struct hostent *h;

int local_port, remote_port;

int nfds;

struct pollfd *pfds;

SpeexPreprocessState *preprocess;

AlsaDevice *audio_dev;

int tmp;

if (argc != 5)

{

fprintf(stderr, "wrong options\n");

exit(1);

}

h = gethostbyname(argv[2]);

if(h==NULL) {

fprintf(stderr, "%s: unknown host '%s' \n", argv[0], argv[1]);

exit(1);

}

local_port = atoi(argv[3]);

remote_port = atoi(argv[4]);

printf("%s: sending data to '%s' (IP : %s) \n", argv[0], h->h_name,

inet_ntoa(*(struct in_addr *)h->h_addr_list[0]));

{

remoteAddr.sin_family = h->h_addrtype;

memcpy((char *) &remoteAddr.sin_addr.s_addr,

h->h_addr_list[0], h->h_length);

remoteAddr.sin_port = htons(remote_port);

}

/* socket creation */

sd=socket(AF_INET, SOCK_DGRAM, 0);

if(sd<0) {

printf("%s: cannot open socket \n",argv[0]);

exit(1);

}

/* bind any port */

cliAddr.sin_family = AF_INET;

cliAddr.sin_addr.s_addr = htonl(INADDR_ANY);

cliAddr.sin_port = htons(local_port);

rc = bind(sd, (struct sockaddr *) &cliAddr, sizeof(cliAddr));

if(rc<0) {

printf("%s: cannot bind port\n", argv[0]);

exit(1);

}

/* Setup audio device */

audio_dev = alsa_device_open(argv[1], SAMPLING_RATE, 1, FRAME_SIZE);

/* Setup the encoder and decoder in wideband */

void *enc_state, *dec_state;

enc_state = speex_encoder_init(&speex_wb_mode);

tmp = 8;

speex_encoder_ctl(enc_state, SPEEX_SET_QUALITY, &tmp);

tmp = 2;

speex_encoder_ctl(enc_state, SPEEX_SET_COMPLEXITY, &tmp);

dec_state = speex_decoder_init(&speex_wb_mode);

tmp = 1;

speex_decoder_ctl(dec_state, SPEEX_SET_ENH, &tmp);

SpeexBits enc_bits, dec_bits;

speex_bits_init(&enc_bits);

speex_bits_init(&dec_bits);

struct sched_param param;

/*param.sched_priority = 40; */

param.sched_priority = sched_get_priority_min(SCHED_FIFO);

if (sched_setscheduler(0,SCHED_FIFO,&param))

perror("sched_setscheduler");

int send_timestamp = 0;

int recv_started=0;

/* Setup all file descriptors for poll()ing */

nfds = alsa_device_nfds(audio_dev);

pfds = malloc(sizeof(*pfds)*(nfds+1));

alsa_device_getfds(audio_dev, pfds, nfds);

pfds[nfds].fd = sd;

pfds[nfds].events = POLLIN;

/* Setup jitter buffer using decoder */

SpeexJitter jitter;

speex_jitter_init(&jitter, dec_state, SAMPLING_RATE);

/* Echo canceller with 200 ms tail length */

SpeexEchoState *echo_state = speex_echo_state_init(FRAME_SIZE, 10*FRAME_SIZE);

tmp = SAMPLING_RATE;

speex_echo_ctl(echo_state, SPEEX_ECHO_SET_SAMPLING_RATE, &tmp);

/* Setup preprocessor and associate with echo canceller for residual echo suppression */

preprocess = speex_preprocess_state_init(FRAME_SIZE, SAMPLING_RATE);

speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_ECHO_STATE, echo_state);

alsa_device_start(audio_dev);

/* Infinite loop on capture, playback and receiving packets */

while (1)

{

/* Wait for either 1) capture 2) playback 3) socket data */

poll(pfds, nfds+1, -1);

/* Received packets */

if (pfds[nfds].revents & POLLIN)

{

/*fprintf (stderr, "x");*/

n = recv(sd, msg, MAX_MSG, 0);

int recv_timestamp = ((int*)msg)[1];

int payload = ((int*)msg)[0];

if ((payload & 0x80000000) == 0)

{

/* Put content of the packet into the jitter buffer, except for the pseudo-header */

speex_jitter_put(&jitter, msg+8, n-8, recv_timestamp);

recv_started = 1;

}

/* Ready to play a frame (playback) */

if (alsa_device_playback_ready(audio_dev, pfds, nfds))

{

short pcm[FRAME_SIZE];

if (recv_started)

{

/* Get audio from the jitter buffer */

speex_jitter_get(&jitter, pcm, NULL);

} else {

for (i=0;i<FRAME_SIZE;i++)

pcm[i] = 0;

}

/* Playback the audio and reset the echo canceller if we got an underrun */

if (alsa_device_write(audio_dev, pcm, FRAME_SIZE))

speex_echo_state_reset(echo_state);

/* Put frame into playback buffer */

speex_echo_playback(echo_state, pcm);

}

/* Audio available from the soundcard (capture) */

if (alsa_device_capture_ready(audio_dev, pfds, nfds))

{

short pcm[FRAME_SIZE], pcm2[FRAME_SIZE];

char outpacket[MAX_MSG];

/* Get audio from the soundcard */

alsa_device_read(audio_dev, pcm, FRAME_SIZE);

/* Perform echo cancellation */

speex_echo_capture(echo_state, pcm, pcm2);

for (i=0;i<FRAME_SIZE;i++)

pcm[i] = pcm2[i];

speex_bits_reset(&enc_bits);

/* Apply noise/echo suppression */

speex_preprocess_run(preprocess, pcm);

/* Encode */

speex_encode_int(enc_state, pcm, &enc_bits);

int packetSize = speex_bits_write(&enc_bits, outpacket+8, MAX_MSG);

/* Pseudo header: four null bytes and a 32-bit timestamp */

((int*)outpacket)[0] = htonl(0);

((int*)outpacket)[1] = send_timestamp;

send_timestamp += FRAME_SIZE;

rc = sendto(sd, outpacket, packetSize+8, 0,

(struct sockaddr *) &remoteAddr,

sizeof(remoteAddr));

if(rc<0) {

printf("cannot send audio data\n");

close(sd);

exit(1);

}

return 0;

}

posted on 2012-11-23 16:56 楊粼波閱讀(4752) 評論(0) 編輯收藏引用所屬分類: 文章收藏

只有注冊用戶登錄后才能發表評論。
【推薦】100%開源！大型工業跨平臺軟件C++源碼提供，建模，組態！

相關文章: cocos2dx 內存管理 select 效率問題微軟代碼簽名證書使用指南 Opus 音頻編碼正式標準化音頻比特率 speex 的一個例子, 使用了SPEEX抖動緩存. 深入剖析 iLBC 編碼器原理 speex開源項目的學習 directsound抓取麥克風PCM數據封裝類丟包補償技術調查

網站導航: 博客園 IT新聞 BlogJava 博問 Chat2DB 管理

青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品

牽著老婆滿街逛

導航

統計

公告

常用鏈接

留言簿(11)

隨筆分類(466)

隨筆檔案(1513)

文章分類(46)

文章檔案(45)

相冊

收藏夾(39)

工具官網

技術網站

開源網站

其他窩點

收藏網站

銀行官網

友情鏈接

資源共享

搜索

積分與排名

最新評論

閱讀排行榜

speex 的一個例子, 使用了SPEEX抖動緩存.