"""Transcoding constants."""

ALAC_CODEC_NAME = 'alac'
FLAC_CODEC_NAME = 'flac'
PCM_CODEC_NAME = 'pcm'
MP3_CODEC_NAME = 'mpa1l3'

ALLOWED_CODECS = [
    ALAC_CODEC_NAME,
    FLAC_CODEC_NAME,
    PCM_CODEC_NAME,
    MP3_CODEC_NAME,
]

# FFMPEG configuration
FFMPEG_SECONDARY_OUTPUT_CONFIG_STRIP_NONAUDIO = (
    '-loglevel debug '
    '-ar {sample_rate} -ac {channels} -b:a {bit_rate} -map 0:a')

PCM_S16LE_CODEC = '-acodec pcm_s16le'
PCM_S24LE_CODEC = '-acodec pcm_s24le'
FLAC_16_BIT_DEPTH = '-acodec flac -sample_fmt s16'
# for 24 bit frequency transcoding via flac codec we should use 32 format.
FLAC_24_BIT_DEPTH = '-acodec flac -sample_fmt s32'
ALAC_16_BIT_DEPTH = '-acodec alac -sample_fmt s16p'
# for 24 bit frequency transcoding via alac codec we should use 32 format.
ALAC_24_BIT_DEPTH = '-acodec alac -sample_fmt s32p'
# we don't setup a bit depth for mp3
MP3_CODEC_CONFIG = '-acodec libmp3lame'

CODEC_WITH_FREQUENCY_MAPPING = {
    (PCM_CODEC_NAME, 16): PCM_S16LE_CODEC,
    (PCM_CODEC_NAME, 24): PCM_S24LE_CODEC,
    (FLAC_CODEC_NAME, 16): FLAC_16_BIT_DEPTH,
    (FLAC_CODEC_NAME, 24): FLAC_24_BIT_DEPTH,
    (ALAC_CODEC_NAME, 16): ALAC_16_BIT_DEPTH,
    (ALAC_CODEC_NAME, 24): ALAC_24_BIT_DEPTH,
    (MP3_CODEC_NAME, 16): MP3_CODEC_CONFIG,
    (MP3_CODEC_NAME, 24): MP3_CODEC_CONFIG,
}

OUTPUT_FILENAME_PATTERN = '{output_folder}/{filename}'