#define __play_buf_size 4096
#define __play_buf_cnt  16

#define __cap_buf_size 4096
#define __cap_buf_cnt  16
static const struct snd_pcm_hardware tcc_pcm_hardware_play = {
    .info = (SNDRV_PCM_INFO_MMAP
             | SNDRV_PCM_INFO_MMAP_VALID
             | SNDRV_PCM_INFO_INTERLEAVED
             | SNDRV_PCM_INFO_BLOCK_TRANSFER
             | SNDRV_PCM_INFO_PAUSE
             | SNDRV_PCM_INFO_RESUME),

    .formats      = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE),
    .rates        = SNDRV_PCM_RATE_8000_96000,
    .rate_min     = 8000,
    .rate_max     = 96000, 
    .channels_min = 2,
    .channels_max = 2,                                

    .period_bytes_min = 1024,
    .period_bytes_max = __play_buf_size,
    .periods_min      = 2,
    .periods_max      = __play_buf_cnt ,
    .buffer_bytes_max = __play_buf_cnt * __play_buf_size ,
    .fifo_size = 16,  //ignored
};

static const struct snd_pcm_hardware tcc_pcm_hardware_capture = {
    .info = (SNDRV_PCM_INFO_MMAP
             | SNDRV_PCM_INFO_MMAP_VALID
             | SNDRV_PCM_INFO_INTERLEAVED
             | SNDRV_PCM_INFO_BLOCK_TRANSFER
             | SNDRV_PCM_INFO_PAUSE
             | SNDRV_PCM_INFO_RESUME),

    .formats      = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
    .rates        = SNDRV_PCM_RATE_8000_96000,
    .rate_min     = 8000,
    .rate_max     = 96000,
    .channels_min = 2,
    .channels_max = 2,                                

    .period_bytes_min = 1024,
    .period_bytes_max = __cap_buf_size ,
    .periods_min      = 2,
    .periods_max      = __cap_buf_cnt,
    .buffer_bytes_max = __cap_buf_cnt * __cap_buf_size,
    .fifo_size = 16, //ignored
};