From dd381319a39d90e3fddd7afbedf5293a49d6f1d6 Mon Sep 17 00:00:00 2001 From: Volker Rümelin Date: Sun, 8 Mar 2020 20:33:17 +0100 Subject: audio: change naming scheme of FLOAT_CONV macros This patch changes the naming scheme of the FLOAT_CONV_TO and FLOAT_CONV_FROM macros to the scheme used in mixeng_template.h. Signed-off-by: Volker Rümelin Message-id: 20200308193321.20668-2-vr_qemu@t-online.de Signed-off-by: Gerd Hoffmann --- audio/mixeng.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) (limited to 'audio/mixeng.c') diff --git a/audio/mixeng.c b/audio/mixeng.c index c14b0d874c..b57fad83bf 100644 --- a/audio/mixeng.c +++ b/audio/mixeng.c @@ -268,17 +268,17 @@ f_sample *mixeng_clip[2][2][2][3] = { }; #ifdef FLOAT_MIXENG -#define FLOAT_CONV_TO(x) (x) -#define FLOAT_CONV_FROM(x) (x) +#define CONV_NATURAL_FLOAT(x) (x) +#define CLIP_NATURAL_FLOAT(x) (x) #else static const float float_scale = UINT_MAX; -#define FLOAT_CONV_TO(x) ((x) * float_scale) +#define CONV_NATURAL_FLOAT(x) ((x) * float_scale) #ifdef RECIPROCAL static const float float_scale_reciprocal = 1.f / UINT_MAX; -#define FLOAT_CONV_FROM(x) ((x) * float_scale_reciprocal) +#define CLIP_NATURAL_FLOAT(x) ((x) * float_scale_reciprocal) #else -#define FLOAT_CONV_FROM(x) ((x) / float_scale) +#define CLIP_NATURAL_FLOAT(x) ((x) / float_scale) #endif #endif @@ -288,7 +288,7 @@ static void conv_natural_float_to_mono(struct st_sample *dst, const void *src, float *in = (float *)src; while (samples--) { - dst->r = dst->l = FLOAT_CONV_TO(*in++); + dst->r = dst->l = CONV_NATURAL_FLOAT(*in++); dst++; } } @@ -299,8 +299,8 @@ static void conv_natural_float_to_stereo(struct st_sample *dst, const void *src, float *in = (float *)src; while (samples--) { - dst->l = FLOAT_CONV_TO(*in++); - dst->r = FLOAT_CONV_TO(*in++); + dst->l = CONV_NATURAL_FLOAT(*in++); + dst->r = CONV_NATURAL_FLOAT(*in++); dst++; } } @@ -316,7 +316,7 @@ static void clip_natural_float_from_mono(void *dst, const struct st_sample *src, float *out = (float *)dst; while (samples--) { - *out++ = FLOAT_CONV_FROM(src->l) + FLOAT_CONV_FROM(src->r); + *out++ = CLIP_NATURAL_FLOAT(src->l) + CLIP_NATURAL_FLOAT(src->r); src++; } } @@ -327,8 +327,8 @@ static void clip_natural_float_from_stereo( float *out = (float *)dst; while (samples--) { - *out++ = FLOAT_CONV_FROM(src->l); - *out++ = FLOAT_CONV_FROM(src->r); + *out++ = CLIP_NATURAL_FLOAT(src->l); + *out++ = CLIP_NATURAL_FLOAT(src->r); src++; } } -- cgit v1.2.3-55-g7522 From 33a93baeae4ca8f03a84b194c55f6e5ee09c33f8 Mon Sep 17 00:00:00 2001 From: Volker Rümelin Date: Sun, 8 Mar 2020 20:33:18 +0100 Subject: audio: consistency changes Change the clip_natural_float_from_mono() function in audio/mixeng.c to be consistent with the clip_*_from_mono() functions in audio/mixeng_template.h. Signed-off-by: Volker Rümelin Message-id: 20200308193321.20668-3-vr_qemu@t-online.de Signed-off-by: Gerd Hoffmann --- audio/mixeng.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'audio/mixeng.c') diff --git a/audio/mixeng.c b/audio/mixeng.c index b57fad83bf..725b529be7 100644 --- a/audio/mixeng.c +++ b/audio/mixeng.c @@ -316,7 +316,7 @@ static void clip_natural_float_from_mono(void *dst, const struct st_sample *src, float *out = (float *)dst; while (samples--) { - *out++ = CLIP_NATURAL_FLOAT(src->l) + CLIP_NATURAL_FLOAT(src->r); + *out++ = CLIP_NATURAL_FLOAT(src->l + src->r); src++; } } -- cgit v1.2.3-55-g7522 From 4218fdd77f1c8ab4dab5ced30c3a0db946a6f04c Mon Sep 17 00:00:00 2001 From: Volker Rümelin Date: Sun, 8 Mar 2020 20:33:19 +0100 Subject: audio: change mixing engine float range to [-1.f, 1.f] Currently the internal float range of the mixing engine is [-.5f, .5f]. PulseAudio, SDL2 and libasound use a [-1.f, 1.f] range. This means with float samples the audio playback volume is 6dB too low and audio recording signals will be clipped in most cases. To avoid another scaling factor in the conv_natural_float_* and clip_natural_float_* functions with FLOAT_MIXENG defined this patch changes the mixing engine float range to [-1.f, 1.f]. Signed-off-by: Volker Rümelin Message-id: 20200308193321.20668-4-vr_qemu@t-online.de Signed-off-by: Gerd Hoffmann --- audio/mixeng.c | 4 ++-- audio/mixeng_template.h | 17 ++++++++--------- 2 files changed, 10 insertions(+), 11 deletions(-) (limited to 'audio/mixeng.c') diff --git a/audio/mixeng.c b/audio/mixeng.c index 725b529be7..739a500449 100644 --- a/audio/mixeng.c +++ b/audio/mixeng.c @@ -271,11 +271,11 @@ f_sample *mixeng_clip[2][2][2][3] = { #define CONV_NATURAL_FLOAT(x) (x) #define CLIP_NATURAL_FLOAT(x) (x) #else -static const float float_scale = UINT_MAX; +static const float float_scale = UINT_MAX / 2.f; #define CONV_NATURAL_FLOAT(x) ((x) * float_scale) #ifdef RECIPROCAL -static const float float_scale_reciprocal = 1.f / UINT_MAX; +static const float float_scale_reciprocal = 2.f / UINT_MAX; #define CLIP_NATURAL_FLOAT(x) ((x) * float_scale_reciprocal) #else #define CLIP_NATURAL_FLOAT(x) ((x) / float_scale) diff --git a/audio/mixeng_template.h b/audio/mixeng_template.h index 77cc89b9e8..fc8e1d4d9e 100644 --- a/audio/mixeng_template.h +++ b/audio/mixeng_template.h @@ -41,32 +41,31 @@ static inline mixeng_real glue (conv_, ET) (IN_T v) #ifdef RECIPROCAL #ifdef SIGNED - return nv * (1.f / (mixeng_real) (IN_MAX - IN_MIN)); + return nv * (2.f / ((mixeng_real)IN_MAX - IN_MIN)); #else - return (nv - HALF) * (1.f / (mixeng_real) IN_MAX); + return (nv - HALF) * (2.f / (mixeng_real)IN_MAX); #endif #else /* !RECIPROCAL */ #ifdef SIGNED - return nv / (mixeng_real) ((mixeng_real) IN_MAX - IN_MIN); + return nv / (((mixeng_real)IN_MAX - IN_MIN) / 2.f); #else - return (nv - HALF) / (mixeng_real) IN_MAX; + return (nv - HALF) / ((mixeng_real)IN_MAX / 2.f); #endif #endif } static inline IN_T glue (clip_, ET) (mixeng_real v) { - if (v >= 0.5) { + if (v >= 1.f) { return IN_MAX; - } - else if (v < -0.5) { + } else if (v < -1.f) { return IN_MIN; } #ifdef SIGNED - return ENDIAN_CONVERT ((IN_T) (v * ((mixeng_real) IN_MAX - IN_MIN))); + return ENDIAN_CONVERT((IN_T)(v * (((mixeng_real)IN_MAX - IN_MIN) / 2.f))); #else - return ENDIAN_CONVERT ((IN_T) ((v * IN_MAX) + HALF)); + return ENDIAN_CONVERT((IN_T)((v * ((mixeng_real)IN_MAX / 2.f)) + HALF)); #endif } -- cgit v1.2.3-55-g7522