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swresample: add exact_rational option

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give high quality resampling
as good as with linear_interp=on
as fast as without linear_interp=on
tested visually with ffplay
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000, showcqt=gamma=5"
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:linear_interp=on, showcqt=gamma=5"
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:exact_rational=on, showcqt=gamma=5"

slightly speed improvement
for fair comparison with -cpuflags 0
audio.wav is ~ 1 hour 44100 stereo 16bit wav file
ffmpeg -i audio.wav -af aresample=osr=48000 -f null -
        old         new
real    13.498s     13.121s
user    13.364s     12.987s
sys      0.131s      0.129s

linear_interp=on
        old         new
real    23.035s     23.050s
user    22.907s     22.917s
sys      0.119s     0.125s

exact_rational=on
real    12.418s
user    12.298s
sys      0.114s

possibility to decrease memory usage if soft compensation is ignored

Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
This commit is contained in:
Muhammad Faiz
2016-06-13 12:36:01 +07:00
parent 5ca44ebd99
commit b8c6e5a661
10 changed files with 78 additions and 30 deletions
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libswresample/arm/resample_init.c
+11 -4
View File
@@ -44,11 +44,15 @@ static int ff_resample_common_##TYPE##_neon(ResampleContext *c, void *dest, cons
int dst_index; \
int index= c->index; \
int frac= c->frac; \
int sample_index = index >> c->phase_shift; \
int sample_index = 0; \
int x4_aligned_filter_length = c->filter_length & ~3; \
int x8_aligned_filter_length = c->filter_length & ~7; \
\
index &= c->phase_mask; \
while (index >= c->phase_count) { \
sample_index++; \
index -= c->phase_count; \
} \
\
for (dst_index = 0; dst_index < n; dst_index++) { \
FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index; \
\
@@ -75,8 +79,11 @@ static int ff_resample_common_##TYPE##_neon(ResampleContext *c, void *dest, cons
frac -= c->src_incr; \
index++; \
} \
sample_index += index >> c->phase_shift; \
index &= c->phase_mask; \
\
while (index >= c->phase_count) { \
sample_index++; \
index -= c->phase_count; \
} \
} \
\
if(update_ctx){ \