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swr: support a seperate output sample bits. 

This avoids user apps having to mangle dither scale. for pcm24

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-24 19:05:54 +01:00
parent c4c702b6d3
commit 8b3affda87
3 changed files with 5 additions and 0 deletions
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3
libswresample/dither.c
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@ -94,6 +94,9 @@ int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFo
scale *= s->dither.scale;
if (out_fmt == AV_SAMPLE_FMT_S32 && s->dither.output_sample_bits)
scale *= 1<<(32-s->dither.output_sample_bits);
s->dither.ns_pos = 0;
s->dither.noise_scale= scale;
s->dither.ns_scale = scale;

1
libswresample/swresample.c
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@ -127,6 +127,7 @@ static const AVOption options[]={
{ "kaiser_beta" , "set swr Kaiser Window Beta" , OFFSET(kaiser_beta) , AV_OPT_TYPE_INT , {.i64=9 }, 2 , 16 , PARAM },
{ "output_sample_bits" , "" , OFFSET(dither.output_sample_bits) , AV_OPT_TYPE_INT , {.i64=0 }, 0 , 64 , 0 },
{0}
};

1
libswresample/swresample_internal.h
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@ -63,6 +63,7 @@ struct DitherContext {
float ns_errors[SWR_CH_MAX][2*NS_TAPS];
AudioData noise; ///< noise used for dithering
AudioData temp; ///< temporary storage when writing into the input buffer isnt possible
int output_sample_bits; ///< the number of used output bits, needed to scale dither correctly
};
struct SwrContext {