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swr: Use a temporary buffer for dither/Noise shaping when the input is read only 

This avoids copying the input

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-10 18:51:30 +01:00
parent 2eec98125e
commit e5a736261b
3 changed files with 20 additions and 14 deletions
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2
libswresample/dither.c
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@ -115,7 +115,9 @@ int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFo
s->dither.method = SWR_DITHER_TRIANGULAR_HIGHPASS;
}
av_assert0(!s->preout.count);
s->dither.noise = s->preout;
s->dither.temp = s->preout;
if (s->dither.method > SWR_DITHER_NS) {
s->dither.noise.bps = 4;
s->dither.noise.fmt = AV_SAMPLE_FMT_FLTP;

31
libswresample/swresample.c
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@ -218,6 +218,7 @@ av_cold void swr_free(SwrContext **ss){
free_temp(&s->preout);
free_temp(&s->in_buffer);
free_temp(&s->dither.noise);
free_temp(&s->dither.temp);
swri_audio_convert_free(&s-> in_convert);
swri_audio_convert_free(&s->out_convert);
swri_audio_convert_free(&s->full_convert);
@ -239,6 +240,7 @@ av_cold int swr_init(struct SwrContext *s){
free_temp(&s->preout);
free_temp(&s->in_buffer);
free_temp(&s->dither.noise);
free_temp(&s->dither.temp);
memset(s->in.ch, 0, sizeof(s->in.ch));
memset(s->out.ch, 0, sizeof(s->out.ch));
swri_audio_convert_free(&s-> in_convert);
@ -611,11 +613,6 @@ static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_co
if(s->resample_first ? !s->rematrix : !s->resample)
preout= midbuf;
if (preout == in && s->dither.method) {
av_assert1(postin == midbuf && midbuf == preout);
postin = midbuf = preout = &preout_tmp;
}
if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
if(preout==in){
out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
@ -645,10 +642,16 @@ static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_co
}
if(preout != out && out_count){
AudioData *conv_src = preout;
if(s->dither.method){
int ch;
int dither_count= FFMAX(out_count, 1<<16);
av_assert0(preout != in);
if (preout == in) {
conv_src = &s->dither.temp;
if((ret=swri_realloc_audio(&s->dither.temp, dither_count))<0)
return ret;
}
if((ret=swri_realloc_audio(&s->dither.noise, dither_count))<0)
return ret;
@ -667,26 +670,26 @@ static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_co
if(len1)
for(ch=0; ch<preout->ch_count; ch++)
s->mix_2_1_simd(preout->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_one, 0, 0, len1);
s->mix_2_1_simd(conv_src->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_one, 0, 0, len1);
if(out_count != len1)
for(ch=0; ch<preout->ch_count; ch++)
s->mix_2_1_f(preout->ch[ch] + off, preout->ch[ch] + off, s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos + off + len1, s->native_one, 0, 0, out_count - len1);
s->mix_2_1_f(conv_src->ch[ch] + off, preout->ch[ch] + off, s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos + off + len1, s->native_one, 0, 0, out_count - len1);
} else {
for(ch=0; ch<preout->ch_count; ch++)
s->mix_2_1_f(preout->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_one, 0, 0, out_count);
s->mix_2_1_f(conv_src->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_one, 0, 0, out_count);
}
} else {
switch(s->int_sample_fmt) {
case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, preout, preout, &s->dither.noise, out_count); break;
case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, preout, preout, &s->dither.noise, out_count); break;
case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, preout, preout, &s->dither.noise, out_count); break;
case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,preout, preout, &s->dither.noise, out_count); break;
case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, conv_src, preout, &s->dither.noise, out_count); break;
case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, conv_src, preout, &s->dither.noise, out_count); break;
case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, conv_src, preout, &s->dither.noise, out_count); break;
case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,conv_src, preout, &s->dither.noise, out_count); break;
}
}
s->dither.noise_pos += out_count;
}
//FIXME packed doesnt need more than 1 chan here!
swri_audio_convert(s->out_convert, out, preout, out_count);
swri_audio_convert(s->out_convert, out, conv_src, out_count);
}
return out_count;
}

1
libswresample/swresample_internal.h
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@ -62,6 +62,7 @@ struct DitherContext {
float ns_coeffs[NS_TAPS]; ///< Noise shaping filter coefficients
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
};
struct SwrContext {