snd_pcm_format_tformat=SND_PCM_FORMAT_S16_LE;// 设置采样位宽为16位 if(snd_pcm_hw_params_set_format(handle,params,format)!=0){// 设置采样位宽 fprintf(stderr,"Can't set sample format\n"); exit(EXIT_FAILURE); } if(snd_pcm_hw_params(handle,params)!=0){// 将设置应用到PCM设备上 ...
SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) static struct snd_soc_dai_ops atmel_ssc_dai_ops = { static const struct snd_soc_dai_ops atmel_ssc_dai_ops = { .startup = atmel_ssc_startup, .shutdown = atmel_ssc_shutdown, .prepare = atmel_ssc_prepare, Expand Down 2 change...
snd_pcm_format_t pcm_format=SND_PCM_FORMAT_S16_LE; snd_pcm_hw_params_set_format(sound->handle, hwparams, pcm_format); sound->format = pcm_format; snd_pcm_hw_params_set_channels(sound->handle, hwparams, LE_SHORT(wav->format.channels)); sound->channels = LE_SHORT(wav->format.chann...
Due to hardware design, the function of DSP can not be configured unless an ALSA PCM application initiates isochronous communication. snd-firewire-tascam-ctl-service Due to hardware design, most controls are not synchronized to hardware expectedly unless an ALSA PCM application initiates isochronous co...
$ 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. ...
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 |...
* * Reference documents about VQA format and its audio codecs * can be found here: * http://www.multimedia.cx */ static const int8_t ws_adpcm_2bit[] = { -2, -1, 0, 1}; static const int8_t ws_adpcm_4bit[] = { -9, -8, -6, -5, -4, -3, -2, -1, 0...
MA 02110-1301 USA */ #include <stdint.h> #include "libavutil/channel_layout.h" #include "libavutil/common.h" #include "libavutil/intreadwrite.h" #include "avcodec.h" #include "internal.h" /** * @file * Westwood SNDx codecs * * Reference documents about VQA format and...
MA 02110-1301 USA */ #include <stdint.h> #include "libavutil/channel_layout.h" #include "libavutil/common.h" #include "libavutil/intreadwrite.h" #include "avcodec.h" #include "internal.h" /** * @file * Westwood SNDx codecs * * Reference documents about VQA format and...
{ WSSndContext *s = avctx->priv_data; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; int in_size, out_size, ret; int sample = 128; uint8_t *samples; uint8_t *samples_end; if (!buf_size) return 0; if (buf_size < 4) { av_log(avctx, AV...