一、Ubuntu12.04下安装音频库客户端软件libpulse-dev

Package libpulse-dev：PulseAudio client development headers and libraries

使用如下命令：

sudo apt-get install libpulse-dev

安装时会提示依赖于下面这几个软件，一并安装即可：

libavahi-client-dev libavahi-common-dev libpulse-mainloop-glib0 libpulse0

这个也可以上packages.ubuntu.com官方网址查询libpulse-dev软件的依赖关系，相关链接如下：

http://packages.ubuntu.com/raring/libpulse-dev

如下图所示：

二、pulseaudio库的使用（同步simple API）

pulseaudio官网有关于pulseaudio的API doxygen使用手册，网址如下：

http://freedesktop.org/software/pulseaudio/doxygen/

1、播音sample

A simple playback tool using the simple API

[cpp]view plaincopy//pacat-simple.c#ifdef HAVE_CONFIG_H #include#endif #include#include#include#include#include#include#include#define BUFSIZE 1024 int main(int argc, char*argv[]) { static const pa_sample_spec ss = { .format = PA_SAMPLE_S16LE, .rate = 44100, .channels = 2 }; pa_simple *s = NULL; int ret = 1; int error; if (argc >1) { int fd; if ((fd = open(argv[1], O_RDONLY))< 0) { fprintf(stderr, __FILE__": open() failed: %s", strerror(errno)); goto finish; } if (dup2(fd, STDIN_FILENO)< 0) { fprintf(stderr, __FILE__": dup2() failed: %s", strerror(errno)); goto finish; } close(fd); } if (!(s = pa_simple_new(NULL, argv[0], PA_STREAM_PLAYBACK, NULL, "playback", &ss, NULL, NULL, &error))) { fprintf(stderr, __FILE__": pa_simple_new() failed: %s", pa_strerror(error)); goto finish; } for (;;) { uint8_t buf[BUFSIZE]; ssize_t r; #if 0 pa_usec_t latency; if ((latency = pa_simple_get_latency(s, &error)) == (pa_usec_t) -1) { fprintf(stderr, __FILE__": pa_simple_get_latency() failed: %s", pa_strerror(error)); goto finish; } fprintf(stderr, "%0.0f usec \r", (float)latency); #endif if ((r = read(STDIN_FILENO, buf, sizeof(buf)))<= 0) { if (r == 0) break; fprintf(stderr, __FILE__": read() failed: %s", strerror(errno)); goto finish; } if (pa_simple_write(s, buf, (size_t) r, &error)< 0) { fprintf(stderr, __FILE__": pa_simple_write() failed: %s", pa_strerror(error)); goto finish; } } if (pa_simple_drain(s, &error)< 0) { fprintf(stderr, __FILE__": pa_simple_drain() failed: %s", pa_strerror(error)); goto finish; } ret = 0; finish: if (s) pa_simple_free(s); return ret; }

A simple recording tool using the simple API

[cpp]view plaincopy//parec-simple.c #ifdef HAVE_CONFIG_H #include#endif #include#include#include#include#include#include#define BUFSIZE 1024 static ssize_t loop_write(int fd, const void*data, size_t size) { ssize_t ret = 0; while (size >0) { ssize_t r; if ((r = write(fd, data, size))< 0) return r; if (r == 0) break; ret += r; data = (const uint8_t*) data + r; size -= (size_t) r; } return ret; } int main(int argc, char*argv[]) { static const pa_sample_spec ss = { .format = PA_SAMPLE_S16LE, .rate = 44100, .channels = 2 }; pa_simple *s = NULL; int ret = 1; int error; if (!(s = pa_simple_new(NULL, argv[0], PA_STREAM_RECORD, NULL, "record", &ss, NULL, NULL, &error))) { fprintf(stderr, __FILE__": pa_simple_new() failed: %s", pa_strerror(error)); goto finish; } for (;;) { uint8_t buf[BUFSIZE]; if (pa_simple_read(s, buf, sizeof(buf), &error)< 0) { fprintf(stderr, __FILE__": pa_simple_read() failed: %s", pa_strerror(error)); goto finish; } if (loop_write(STDOUT_FILENO, buf, sizeof(buf)) != sizeof(buf)) { fprintf(stderr, __FILE__": write() failed: %s", strerror(errno)); goto finish; } } ret = 0; finish: if (s) pa_simple_free(s); return ret; }

3、编译、运行含有pulseaudio库的时候，需要添加pulseaudio的动态链接库-libpulse等，

(可以在/usr/lib/i386-linux-gnu/目录下找到pulse的动态库

/usr/lib/i386-linux-gnu/libpulsecommon-1.1.so
/usr/lib/i386-linux-gnu/libpulsedsp.so
/usr/lib/i386-linux-gnu/libpulse-mainloop-glib.so
/usr/lib/i386-linux-gnu/libpulse-mainloop-glib.so.0
/usr/lib/i386-linux-gnu/libpulse-mainloop-glib.so.0.0.4
/usr/lib/i386-linux-gnu/libpulse-simple.so
/usr/lib/i386-linux-gnu/libpulse-simple.so.0
/usr/lib/i386-linux-gnu/libpulse-simple.so.0.0.3
/usr/lib/i386-linux-gnu/libpulse.so
/usr/lib/i386-linux-gnu/libpulse.so.0
/usr/lib/i386-linux-gnu/libpulse.so.0.13.5)

例如,以pacat-simple.c程序为例：

(1)编译命令如下：

gcc -o pacat-simple pacat-simple.c -lpulse -lpulsecommon-1.1 -lpulse-simple
(2)运行上一步生成的pacat-simple可执行程序

http://www.360doc.cn/article/pacat-simple 飞鸟.wav

(注意：有一个命令行参数，是音频文件名，上网搜索一个wav格式的音频文件，放在当前目录，然后执行。)

ALSA全称为：Advanced Linux Sound Architecture

一个网址为：http://www.alsa-project.org/main/index.php/Main_Page