"""Field constants."""

# audio metadata fields
CONTAINER = 'container'
CHANNELS = 'channels'
CODEC = 'codec'
SAMPLE_RATE = 'sample_rate'
BIT_RATE = 'bit_rate'
BIT_DEPTH = 'bit_depth'
BITS_PER_SAMPLE = 'bits_per_sample'
FILE_SIZE = 'file_size'
PLAYTIME_SECONDS = 'playtime_seconds'
MIME_TYPE = 'mime_type'

# computed fields
LOSSLESS = 'lossless'
CHANNEL_MODE = 'channel_mode'

# available codec names
ALAC_CODEC_NAME = 'alac'
FLAC_CODEC_NAME = 'flac'
PCM_CODEC_NAME = 'pcm'
MP4_CODEC_NAME = 'aac lc'

ALLOWED_CODECS = [
    ALAC_CODEC_NAME,
    FLAC_CODEC_NAME,
    PCM_CODEC_NAME,
    MP4_CODEC_NAME
]

# available container names
FLAC_CONTAINER_NAME = 'flac'
WAVE_CONTAINER_NAME = 'wave'
MPEG4_CONTAINER_NAME = 'mpeg-4'

ALLOWED_CONTAINERS = [
    FLAC_CONTAINER_NAME,
    WAVE_CONTAINER_NAME,
    MPEG4_CONTAINER_NAME
]

ALLOWED_SAMPLE_RATES = {
    16: [44100, 48000],
    24: [44100, 48000, 88200, 96000, 176400, 192000, 352800, 384000]
}

NUMBER_OF_CHANNELS_IN_STEREO = 2
NUMBER_OF_CHANNELS_IN_MONO = 1