Commit 1b7ec33b authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
Browse files

Decoder for PCM 20-bits (VLC_CODEC_S20B)

This is also known as MIME audio/L20 (IETF RFC3190)
parent e6d8827a
......@@ -169,6 +169,7 @@ static const int16_t alawtos16[256] =
static void DecodeAlaw( void *, const uint8_t *, unsigned );
static void DecodeUlaw( void *, const uint8_t *, unsigned );
static void DecodeS20B( void *, const uint8_t *, unsigned );
/*****************************************************************************
* DecoderOpen: probe the decoder and return score
......@@ -200,6 +201,7 @@ static int DecoderOpen( vlc_object_t *p_this )
case VLC_CODEC_S32B:
case VLC_CODEC_S24L:
case VLC_CODEC_S24B:
case VLC_CODEC_S20B:
case VLC_CODEC_S16L:
case VLC_CODEC_S16B:
case VLC_CODEC_S8:
......@@ -259,6 +261,13 @@ static int DecoderOpen( vlc_object_t *p_this )
p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
p_dec->fmt_in.audio.i_bitspersample = 24;
}
else if( p_dec->fmt_in.i_codec == VLC_CODEC_S20B )
{
p_dec->fmt_out.i_codec = VLC_CODEC_S32N;
p_dec->fmt_out.audio.i_bitspersample = 32;
p_sys->decode = DecodeS20B;
p_dec->fmt_in.audio.i_bitspersample = 20;
}
else if( p_dec->fmt_in.i_codec == VLC_CODEC_S16L ||
p_dec->fmt_in.i_codec == VLC_CODEC_S16B )
{
......@@ -400,6 +409,23 @@ static void DecodeUlaw( void *outp, const uint8_t *in, unsigned samples )
*(out++) = ulawtos16[*(in++)];
}
static void DecodeS20B( void *outp, const uint8_t *in, unsigned samples )
{
int32_t *out = outp;
while( samples >= 2 )
{
*(out++) = U32_AT(in) & ~0xFFF;
*(out++) = U32_AT(in + 1) << 12;
in += 5;
samples -= 2;
}
/* No U32_AT() for the last odd sample: avoid off-by-one overflow! */
if( samples )
*(out++) = ((U16_AT(in) << 16) | (in[2] << 8)) & ~0xFFF;
}
/*****************************************************************************
* DecoderClose: decoder destruction
*****************************************************************************/
......
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