pcmFMT.dwAvgBytesPerSec=pcmFMT.dwSamplesPerSec*sizeof(m_pcmData); pcmFMT.uiBitsPerSample=bits; memcpy(pcmFMT.fccID,"fmt ",strlen("fmt ")); pcmFMT.dwSize=16; pcmFMT.wBlockAlign=2; pcmFMT.wChannels=channels; pcmFMT.wFormatTag=1; fwrite(&pcmFMT,sizeof(WAVE_FMT),1,fpout); //WAVE_D...
检查/dev/snd/ 目录下是否存在 PCM 设备文件(如 pcmC0D0p、pcmC0D0c 等)。 使用arecord -l 或aplay -l 命令列出所有可用的音频设备,确认 PCM 设备是否被正确识别。 查看pcm_open 函数的调用参数是否正确: 检查调用 pcm_open 函数时传递的参数,确保设备名称和访问模式(如只读、只写或读写)是正确的。 示...
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snd_pcm_open通过调用snd_config_update_ref来获取als.conf中的配置信息,参数保存至snd_config_t 。通过snd_pcm_open_noupdate 解析 snd_config_t 配置,snd_pcm_open_noupdate 函数原型如下static int snd_pcm_open_noupdate(snd_pcm_t **pcmp, snd_config_t *root, const char *name, snd_pcm_stream_t ...
《杂记asla-lib库函数 snd_pcm_open打开流程》 soc_probe ==> snd_soc_register_card或者snd_soc_register_dai或者snd_soc_register_platform或者snd_soc_register_codec ==> snd_soc_instantiate_cards ==> snd_soc_instantiate_card ==> codec_dev->probe ...
I am trying to implement an Android Application where it makes use of tinyalsa: pcm_open() API. I get "cannot open device (0) for card(2): Permission denied" error when I tried to launch the application from Android Studio that attempts to open an audio stream fro...
how to capure pcm_open void *data use frida? i capure success,but data is wrong .did you have method?pcm_open c code : int pcm_read(struct pcm *pcm, void *data, unsigned int count) | { | struct snd_xferi x; | | if (!(pcm->flags & PCM_IN)) ...
==> snd_pcm_open_conf(pcmp, name, root, conf, stream, mode); ==> open_func = snd_dlobj_cache_lookup(open_name);将获得lib库中_snd_pcm_empty_open函数 所以open_func将等于_snd_pcm_empty_open _snd_pcm_empty_open _snd_pcm_asym_open ...
==> snd_pcm_open(&handle, pcm_name, stream, open_mode); //打开一路pcm,刷新config配置 如果是"default",同时type等于SND_CONFIG_TYPE_COMPOUND那么这里对应"empty" static const char *const build_in_pcms[] = { "adpcm", "alaw", "copy", "dmix", "file", "hooks", "hw", "ladspa", "...
...int ret = snd_pcm_open(&alsa_pcm_, device_name_.c_str(), SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);...在多次尝试无果以后,最终只能放弃使用ALSA来进行音频设备的数据采集,而采用复杂一些的PulseAudio框架。...最后的结果也证明,更加上层的PulseAudio还是正确的处理了有效的音频设备和无效音...