打开PCM设备 设置硬件参数 读/写数据 PCM播放示例代码 PCM录音示例代码 使用异步方法 snd_async_add_pcm_handler()函数 snd_pcm_avail_update()函数 PCM异步播放示例 PCM异步录音示例 使用poll()函数 使用poll I/O多路复用实现读写 PCM播放示例 PCM录音示例 PCM设备状态 PCM播放——加入状态控制 snd_pcm_readi/...
snd_pcm_open_conf 调用snd_dlobj_cache_get在动态库中libasound_module_pcm_hw.so获取函数指针_snd_pcm_hw_open_snd_pcm_hw_open通过调用snd_pcm_hw_open来创建hw_pcm设备。snd_pcm_hw_open函数原型如下int snd_pcm_hw_open(snd_pcm_t **pcmp, const char *name, int card, int device, int subdevic...
name 要打开的pcm设备名字,默认default,或者从asound.conf或者asoundrc里面选择所要打开的设备 stream SND_PCM_STREAM_PLAYBACK 或 SND_PCM_STREAM_CAPTURE,分别表示播放和录音的PCM流 mode 打开pcm句柄时的一些附加参数 SND_PCM_NONBLOCK 非阻塞打开(默认阻塞打开), SND_PCM_ASYNC 异步模式打开 返回值 0 表示打开...
}/*分配空间 period的空间,period指向空间首地址*/period_size_real = period_size * channels *snd_pcm_format_physical_width(format) /8;//snd_pcm_format_physical_width:return bits needed to store a PCM sample.period =malloc(period_size_real);if(period ==NULL) {printf("No enough memory\n")...
I'm also having a SIGSEGV with +async-update +async-input Full command: "xfreerdp /w:1280 /h:960 /vc:rdpsnd,sys:alsa /u:login '/p:password' /v:192.168.4.66 +async-update +async-input" SIGSEGV in thread 5. Thread 7 (Thread 0x7fffdd232700 (LWP 27835)): #0 0x00007ffff2935633...
base_rate = priv->sysclk;break;caseARIZONA_CLK_ASYNCCLK: base_rate = priv->asyncclk;break;default:return0; }if(base_rate ==0)return0;if(base_rate %8000) constraint = &arizona_44k1_constraint;elseconstraint = &arizona_48k_constraint;returnsnd_pcm_hw_constraint_list(substream->runtime,0...
Android 音视频开发(三):使用 AudioTrack 播放PCM音频 2017-09-01 15:09 −一、AudioTrack 基本使用 AudioTrack 类可以完成Android平台上音频数据的输出任务。AudioTrack有两种数据加载模式(MODE_STREAM和MODE_STATIC),对应的是数据加载模式和音频流类型, 对应着两种完全不同的使用场景。 MODE_STREAM:... ...
*/if(res >=snd_pcm_lib_buffer_bytes(substream)) {if(res ==snd_pcm_lib_buffer_bytes(substream)) res =0; }returnbytes_to_frames(substream->runtime, res); } 开发者ID:AnadoluPanteri,项目名称:kernel-plus-harmattan,代码行数:26,代码来源:dma.c ...
示例1: pcm_open ▲点赞 6▼ staticintpcm_open(pcm_handle_t* pcm,constpcm_desc_t* desc){constsnd_pcm_format_tfmt = SND_PCM_FORMAT_S16_LE;snd_pcm_stream_tstm;interr;if(desc->flags & PCM_FLAG_IN) stm = SND_PCM_STREAM_CAPTURE;elsestm = SND_PCM_STREAM_PLAYBACK; ...
SND_PCM_ACCESS_RW_INTERLEAVED);/* Signed 16-bit little-endian format */snd_pcm_hw_params_set_format(handle, params,SND_PCM_FORMAT_U8);/* Two channels (stereo) */snd_pcm_hw_params_set_channels(handle, params,1);/* 44100 bits/second sampling rate (CD quality) */val =44100; ...