PCM设备状态 PCM播放——加入状态控制 snd_pcm_readi/snd_pcm_writei错误处理 混音器设置 打开混音器 Attach关联设备 注册 加载 查找元素 获取/更改元素 示例程序 回环测试例程 总结 ALSA插件 学习总结 MP157开发板支持音频,板上搭载了音频编解码芯片CS42L51,支持播放以及录音功能。 ALSA概述 ALSA是Advanced Lin...
snd_pcm_set_appl_ptr(pcm, &hw->mmap_control->appl_ptr, hw->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL); return 0; } snd_pcm_mmap switch (i->type) { case SND_PCM_AREA_MMAP: // 表示为数据区分配驱动内存,在snd_pcm_hw_channel_info中设置了type ptr = mmap(NULL, size, PROT_READ|PROT_WRIT...
/* Interleaved mode */ snd_pcm_hw_params_set_access(handle, params, &nb...
Hi guys, I've got "ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred" in todays master (FreeRDP version 1.1.0-dev (git 1.0.1-1519-g1ce9e)). I'm using these parameters: xfreerdp /u:user /vc:rdpsnd,sys:alsa,dev:default /mic +clipboar...
(31 Steps) – Bass Boost Sound Effect – Ancillary Data Extraction – CRC Error and MPEG Frame Synchronization Indicators • Programmable Audio Output for Interfacing with Common Audio DAC Single-Chip – PCM Format Compatible 2 – I S Format Compatible Flash • 8-bit MCU C51 Core Based (...