在使用snd_pcm_hw_params_set_buffer_size()时,哪些参数可能导致“无效参数”错误? snd_pcm_hw_params_set_buffer_size()是一个函数,用于设置音频设备的缓冲区大小。它属于ALSA(Advanced Linux Sound Architecture)音频驱动程序的一部分,用于在Linux系统上进行音频处理。 该函数的错误“无效参数”表示...
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...
问snd_pcm_hw_params_set_buffer_size()错误：“无效参数”EN回发或回调参数无效。在配置中使用 <pag...
dmabufferramstaticintsndpcmdefaultmmapstructsndpcmsubstreamsubstreamstructvmareastructareavma操作函数当应用程序向该area读写不存在的内存数据将执行sndpcmvmopsdata中的fault函数sndpcmmmapdatafault进一步以页为单位申请内存空间所以如果用户程序需要64k那么将执行16次每次申请4k空间luthergliethttp 原文地址:http://blog...
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: BackendSpecific { err: BackendSpecificError { description: "ALSA function 'snd_pcm_hw_params_set_buffer_size' failed with error 'EINVAL: Invalid argument'" } }', src/main.rs:25:10 ...
// mmap the DMA buffer on RAM static int snd_pcm_default_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *area) { area->vm_ops = &snd_pcm_vm_ops_data; // vma操作函数,当应用程序向该area读写不存在的内存数据时, area->vm_private_data = substream; //将执行snd_pcm...
staticintsoc_new_pcm(structsnd_soc_pcm_runtime*rtd,intnum) { ... if(platform->driver->ops){ soc_pcm_ops.mmap=platform->driver->ops->mmap; soc_pcm_ops.pointer=platform->driver->ops->pointer; soc_pcm_ops.ioctl=platform->driver->ops->ioctl; soc_pcm...
$ cat /proc/asound/card0/pcm0p/sub0/hw_params access: RW_INTERLEAVED format: S16_LE subformat: STD channels: 1 rate: 48000 (1572864000/32768) period_size: 8192 buffer_size: 32768 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. ...
// set the silence data on the buffer int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples) { int width; unsigned char *dst, *pat; if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) return -EINVAL; ...
表示为数据区分配驱动内存在sndpcmhwchannelinfo中设置了typeptrmmapnullsizeprotreadprotwritemapfilemapsharediummapfddmabufferramstaticintsndpcmdefaultmmapstructsndpcmsubstreamsubstreamstructvmareastructareavma操作函数当应用程序向该area读写不存在的内存数据时areavmprivatedata函数sndpcmmmapdatafault进一步以页为单位...