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flac: added optimized converter for 16 bit

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flac_convert_16() runs a lot faster than the generic (and quite buggy)
function flac_convert().  flac_convert_16() is only used for
non-stereo files, since there is already flac_convert_stereo16().
This commit is contained in:
Max Kellermann
2008-09-23 23:59:55 +02:00
parent 7486c15088
commit 8c2bde70b0
1 changed files with 17 additions and 0 deletions
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17
src/inputPlugins/_flac_common.c
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@@ -219,6 +219,19 @@ static void flac_convert_stereo16(int16_t *dest,
} }
} }
static void
flac_convert_16(int16_t *dest,
unsigned int num_channels,
const FLAC__int32 * const buf[],
unsigned int position, unsigned int end)
{
unsigned int c_chan;
for (; position < end; ++position)
for (c_chan = 0; c_chan < num_channels; c_chan++)
*dest++ = buf[c_chan][position];
}
static void flac_convert(unsigned char *dest, static void flac_convert(unsigned char *dest,
unsigned int num_channels, unsigned int num_channels,
unsigned int bytes_per_sample, unsigned int bytes_per_sample,
@@ -265,6 +278,10 @@ flac_common_write(FlacData *data, const FLAC__Frame * frame,
flac_convert_stereo16((int16_t*)data->chunk, flac_convert_stereo16((int16_t*)data->chunk,
buf, c_samp, buf, c_samp,
c_samp + num_samples); c_samp + num_samples);
else if (bytes_per_sample == 2)
flac_convert_16((int16_t*)data->chunk,
num_channels, buf, c_samp,
c_samp + num_samples);
else else
flac_convert(data->chunk, flac_convert(data->chunk,
num_channels, bytes_per_sample, buf, num_channels, bytes_per_sample, buf,