swresample: add a "clipping protection" mode when mixing
This mode normalizes audio down to stay below 1.0 after mixing, so no clipping occurs when converting to integer formats.
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@ -123,6 +123,7 @@ static const AVOption options[]={
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{ "kaiser_beta" , "set swr Kaiser window beta" , OFFSET(kaiser_beta) , AV_OPT_TYPE_DOUBLE , {.dbl=9 }, 2 , 16 , PARAM },
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{ "output_sample_bits" , "set swr number of output sample bits", OFFSET(dither.output_sample_bits), AV_OPT_TYPE_INT , {.i64=0 }, 0 , 64 , PARAM },
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{ "clip_protection" , "Clipping Protection" , OFFSET(clip_protection), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, PARAM },
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{0}
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};
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@ -453,6 +453,7 @@ av_cold int swri_rematrix_init(SwrContext *s){
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int nb_out = s->out.ch_count;
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s->mix_any_f = NULL;
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s->clip_max = 1.0f;
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if (!s->rematrix_custom) {
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int r = auto_matrix(s);
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@ -567,7 +568,7 @@ int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mus
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if(s->mix_any_f) {
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s->mix_any_f(out->ch, (const uint8_t **)in->ch, s->native_matrix, len);
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return 0;
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goto clip_protection;
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}
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if(s->mix_2_1_simd || s->mix_1_1_simd){
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@ -638,5 +639,22 @@ int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mus
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}
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}
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}
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clip_protection:
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if (s->clip_protection && s->int_sample_fmt == AV_SAMPLE_FMT_FLTP)
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{
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for(j = 0; j < out->ch_count; j++) {
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for(i = 0; i < len; i++) {
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const float sample = fabsf(((float *)out->ch[j])[i]);
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if (sample > s->clip_max) {
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s->clip_max = sample;
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av_log(s, AV_LOG_INFO, "Clipping protection at %.3f\n", sample);
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}
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if (s->clip_max > 1.0f)
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((float *)out->ch[j])[i] /= s->clip_max;
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}
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}
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}
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return 0;
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}
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@ -183,6 +183,9 @@ struct SwrContext {
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mix_any_func_type *mix_any_f;
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/* TODO: callbacks for ASM optimizations */
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int clip_protection;
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float clip_max;
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};
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av_warn_unused_result
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