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mp3: dither a whole block at a time

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Fill the whole output buffer at a time by using dither_buffer()'s
ability to decode blocks.  Calculate how many samples fit into the
output buffer before each invocation.
This commit is contained in:
Max Kellermann 2008-08-26 08:27:12 +02:00
parent e99536e8eb
commit af83ac5ec6
1 changed files with 9 additions and 3 deletions
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12
src/inputPlugins/mp3_plugin.c
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@ -932,12 +932,18 @@ static int mp3Read(mp3DecodeData * data, struct decoder *decoder,
pcm_length -= data->dropSamplesAtEnd; pcm_length -= data->dropSamplesAtEnd;
} }
for (; i < pcm_length; i++) { while (i < pcm_length) {
unsigned int num_samples; unsigned int num_samples =
(data->outputBufferEnd - data->outputPtr) /
(2 * MAD_NCHANNELS(&(data->frame).header));
if (num_samples > pcm_length - i)
num_samples = pcm_length - i;
i += num_samples;
num_samples = dither_buffer((mpd_sint16 *) data->outputPtr, num_samples = dither_buffer((mpd_sint16 *) data->outputPtr,
&data->synth, &data->dither, &data->synth, &data->dither,
i, i + 1, i - num_samples, i,
MAD_NCHANNELS(&(data->frame).header)); MAD_NCHANNELS(&(data->frame).header));
data->outputPtr += 2 * num_samples; data->outputPtr += 2 * num_samples;