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| author | Michael Niedermayer <michaelni@gmx.at> | 2012-04-10 21:10:14 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-04-10 21:18:33 +0200 |
| commit | b1ef4dc406e8a0bd9acea40d880aa4e74412075b (patch) | |
| tree | f27a7122240b7b2b28f6c151f1edbb9c03259aca | |
| parent | 0cff3e130bfe0471d58ca55655a9d2b73a2873f5 (diff) | |
| download | ffmpeg-b1ef4dc406e8a0bd9acea40d880aa4e74412075b.tar.gz | |
swr: add triangular dither support
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libswresample/dither.c | 5 | ||||
| -rw-r--r-- | libswresample/swresample.c | 1 | ||||
| -rw-r--r-- | libswresample/swresample.h | 1 |
3 files changed, 7 insertions, 0 deletions
diff --git a/libswresample/dither.c b/libswresample/dither.c index 4e39cceb0d..663e2007ba 100644 --- a/libswresample/dither.c +++ b/libswresample/dither.c @@ -40,6 +40,11 @@ void swri_get_dither(void *dst, int len, unsigned seed, enum AVSampleFormat out_ switch(method){ case SWR_DITHER_RECTANGULAR: v= ((double)seed) / UINT_MAX - 0.5; break; + case SWR_DITHER_TRIANGULAR : + v = ((double)seed) / UINT_MAX; + seed = seed*1664525 + 1013904223; + v-= ((double)seed) / UINT_MAX; + break; default: av_assert0(0); } diff --git a/libswresample/swresample.c b/libswresample/swresample.c index 8b06061e7c..58096b3927 100644 --- a/libswresample/swresample.c +++ b/libswresample/swresample.c @@ -55,6 +55,7 @@ static const AVOption options[]={ {"res", "force resampling", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE}, INT_MIN, INT_MAX, 0, "flags"}, {"dither", "dither method" , OFFSET(dither_method), AV_OPT_TYPE_INT, {.dbl=0}, 0, SWR_DITHER_NB-1, 0, "dither_method"}, {"rectangular", "rectangular dither", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_RECTANGULAR}, INT_MIN, INT_MAX, 0, "dither_method"}, +{"triangular" , "triangular dither" , 0, AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR }, INT_MIN, INT_MAX, 0, "dither_method"}, {0} }; diff --git a/libswresample/swresample.h b/libswresample/swresample.h index 1f87617d9d..9bd5b6769d 100644 --- a/libswresample/swresample.h +++ b/libswresample/swresample.h @@ -48,6 +48,7 @@ enum SwrDitherType { SWR_DITHER_NONE = 0, SWR_DITHER_RECTANGULAR, + SWR_DITHER_TRIANGULAR, SWR_DITHER_NB, ///< not part of API/ABI }; |