40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
/* sndprobe.c — 探测 /dev/snd/pcmC0D{p,c}* 的 SNDRV_PCM_IOCTL_INFO（id/name/subs），
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* 定位 R3 Pro II 耳机输出到底在哪个 PCM 设备。静态 mipsel，只读不写参数。 */
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sound/asound.h>
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int main(void)
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{
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static const char *devs[] = {
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"/dev/snd/pcmC0D0p", "/dev/snd/pcmC0D1p", "/dev/snd/pcmC0D0c", "/dev/snd/pcmC0D1c",
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};
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for (int i = 0; i < 4; i++) {
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int fd = open(devs[i], O_RDWR | O_NONBLOCK);
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if (fd < 0) { printf("%s: open fail\n", devs[i]); continue; }
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struct snd_pcm_info info;
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memset(&info, 0, sizeof info);
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if (ioctl(fd, SNDRV_PCM_IOCTL_INFO, &info) == 0)
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printf("%s: card=%d dev=%d sub=%d id=\"%s\" name=\"%s\" subname=\"%s\" subs=%u/%u\n",
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devs[i], info.card, info.device, info.subdevice,
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info.id, info.name, info.subname, info.subdevices_avail, info.subdevices_count);
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else
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printf("%s: INFO ioctl fail\n", devs[i]);
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close(fd);
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}
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/* 控制设备：看卡名 */
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int cf = open("/dev/snd/controlC0", O_RDONLY);
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if (cf >= 0) {
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struct snd_ctl_card_info ci;
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memset(&ci, 0, sizeof ci);
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if (ioctl(cf, SNDRV_CTL_IOCTL_CARD_INFO, &ci) == 0)
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printf("controlC0: id=\"%s\" driver=\"%s\" name=\"%s\" longname=\"%s\"\n",
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ci.id, ci.driver, ci.name, ci.longname);
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close(cf);
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}
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return 0;
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}
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