SNDRV_PCM_RATE_16000) #define AK4641_FORMATS (SNDRV_PCM_FMTBIT_S16_LE) static struct snd_soc_dai_ops ak4641_i2s_dai_ops = { static const struct snd_soc_dai_ops ak4641_i2s_dai_ops = { .hw_params = ak4641_i2s_hw_params, .set_fmt = ak4641_i2s_set_dai_fmt, .digital_mute = ...
/* supported PCM sample formats */ enum { VIRTIO_SND_PCM_FMT_S8 = 0, VIRTIO_SND_PCM_FMT_U8, VIRTIO_SND_PCM_FMT_S16, VIRTIO_SND_PCM_FMT_U16, VIRTIO_SND_PCM_FMT_S32, VIRTIO_SND_PCM_FMT_U32, VIRTIO_SND_PCM_FMT_FLOAT, VIRTIO_SND_PCM_FMT_FLOAT64 }; #define VIRTIO_SND_PCM_FMTB...
snd_pcm_readi 是ALSA(Advanced Linux Sound Architecture)库中的一个函数,用于从 PCM(Pulse Code Modulation)设备中读取音频数据。当你遇到 snd_pcm_readi 返回-5 时,这通常表示函数执行失败,并返回一个错误代码。在 ALSA 中,错误代码通常以负值表示。 1. 确认 snd_pcm_readi 函数返回 -5 的含义...
==> 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", "...
tests/pcm_test.c \ tests/header_test.c \ tests/utils.c \ tests/scale_clip_test.c \ tests/pipe_test.c \ tests/rdwr_test.c \ tests/floating_point_test.c \ tests/benchmark.c EXTRA_DIST += $(BUILT_SOURCES) \ tests/write_read_test.tpl tests/write_read_test.def \ ...
虽然AR仍在起步阶段，但与VR（虚拟现实）不同的是其门槛更低，不需要额外购买昂贵的头显或是PC，实现...
==> 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", "...
_snd_pcm_empty_open和snd_pcm_open_named_slave ==> 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 ...
(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 (...
PCM全称Pulse-Code Modulation,就是脉冲调制编码,简单来说就是一种用数字表示采样模拟信号的方法。 从声卡设备生成PCM数据需要三个阶段:采样、量化、编码,关于这三者的细节不多说,我们直接看下PCM的格式: 例如一段有符号的 8-bit 的 pcm 数据: +---+---+---+--- binary | 0010 0000 | 1010 0000 |...