69,373
社区成员
发帖
与我相关
我的任务
分享
#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
char *snd_pcm_hw_param_names[] = {
HW_PARAM(ACCESS),
HW_PARAM(FORMAT),
HW_PARAM(SUBFORMAT),
HW_PARAM(SAMPLE_BITS),
HW_PARAM(FRAME_BITS),
HW_PARAM(CHANNELS),
HW_PARAM(RATE),
HW_PARAM(PERIOD_TIME),
HW_PARAM(PERIOD_SIZE),
HW_PARAM(PERIOD_BYTES),
HW_PARAM(PERIODS),
HW_PARAM(BUFFER_TIME),
HW_PARAM(BUFFER_SIZE),
HW_PARAM(BUFFER_BYTES),
HW_PARAM(TICK_TIME),
};
#define LOG_INFO 0
#define LOG_ERR 1
#define LOG_DEBUG 2
char *system_log[] = {
[LOG_INFO] = "info",
[LOG_ERR] = "error",
[LOG_DEBUG] = "debug"
};
即:
char *systm_log[] = {
[0] = "info",
[1] = "error",
[2] = "debug"
};
/*
* 所以SNDRV_PCM_HW_PARAM_ACCESS应该也是个宏,是字符串数组snd_pcm_hw_param_names的下标而已
* 这样用宏使用snd_pcm_hw_param_names里的某个字符串意义更明确
*/
enum sndrv_pcm_hw_param {
SNDRV_PCM_HW_PARAM_ACCESS = 0, /* Access type */
SNDRV_PCM_HW_PARAM_FIRST_MASK = SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_HW_PARAM_FORMAT, /* Format */
SNDRV_PCM_HW_PARAM_SUBFORMAT, /* Subformat */
SNDRV_PCM_HW_PARAM_LAST_MASK = SNDRV_PCM_HW_PARAM_SUBFORMAT,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS = 8, /* Bits per sample */
SNDRV_PCM_HW_PARAM_FIRST_INTERVAL = SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
SNDRV_PCM_HW_PARAM_FRAME_BITS, /* Bits per frame */
SNDRV_PCM_HW_PARAM_CHANNELS, /* Channels */
SNDRV_PCM_HW_PARAM_RATE, /* Approx rate */
SNDRV_PCM_HW_PARAM_PERIOD_TIME, /* Approx distance between interrupts
in us */
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, /* Approx frames between interrupts */
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, /* Approx bytes between interrupts */
SNDRV_PCM_HW_PARAM_PERIODS, /* Approx interrupts per buffer */
SNDRV_PCM_HW_PARAM_BUFFER_TIME, /* Approx duration of buffer in us */
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, /* Size of buffer in frames */
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, /* Size of buffer in bytes */
SNDRV_PCM_HW_PARAM_TICK_TIME, /* Approx tick duration in us */
SNDRV_PCM_HW_PARAM_LAST_INTERVAL = SNDRV_PCM_HW_PARAM_TICK_TIME
};