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Adds a target parameter to the volnorm filter. 

This is useful to avoid clipping when processing data,
  but less important when watching a clip live.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16972 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
joey 2005-11-11 02:47:21 +00:00
parent 0c187db220
commit 8572f14094
2 changed files with 21 additions and 11 deletions
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5
DOCS/man/en/mplayer.1
View File

@ -4251,7 +4251,7 @@ unchanged, with -1.0 left and right channels will be swapped.
.PD 1
.
.TP
.B volnorm[=method]
.B volnorm[=method:target]
Maximizes the volume without distorting the sound.
.PD 0
.RSs
@ -4264,6 +4264,9 @@ weighted mean over past samples (default).
2: Use several samples to smooth the variations via the standard
weighted mean over past samples.
.REss
.IPs <target>
Sets the target amplitude as a fraction of the maximum for the
sample type (default: 0.25).
.RE
.PD 1
.

27
libaf/af_volnorm.c
View File

@ -38,9 +38,6 @@
#define MUL_INIT 1.0
#define MUL_MIN 0.1
#define MUL_MAX 5.0
// "Ideal" level
#define MID_S16 (SHRT_MAX * 0.25)
#define MID_FLOAT (INT_MAX * 0.25)
// Silence level
// FIXME: should be relative to the level of the samples
@ -51,6 +48,8 @@
#define SMOOTH_MUL 0.06
#define SMOOTH_LASTAVG 0.06
#define DEFAULT_TARGET 0.25
// Data for specific instances of this filter
typedef struct af_volume_s
{
@ -64,6 +63,9 @@ typedef struct af_volume_s
float avg; // average level of the sample
int len; // sample size (weight)
} mem[NSAMPLES];
// "Ideal" level
float mid_s16;
float mid_float;
}af_volnorm_t;
// Initialization and runtime control
@ -88,11 +90,14 @@ static int control(struct af_instance_s* af, int cmd, void* arg)
}
return af_test_output(af,(af_data_t*)arg);
case AF_CONTROL_COMMAND_LINE:{
int i;
sscanf((char*)arg,"%d", &i);
int i = 0;
float target = DEFAULT_TARGET;
sscanf((char*)arg,"%d:%f", &i, &target);
if (i != 1 && i != 2)
return AF_ERROR;
s->method = i-1;
s->mid_s16 = ((float)SHRT_MAX) * target;
s->mid_float = ((float)INT_MAX) * target;
return AF_OK;
}
}
@ -128,7 +133,7 @@ static void method1_int16(af_volnorm_t *s, af_data_t *c)
if (curavg > SIL_S16)
{
neededmul = MID_S16 / (curavg * s->mul);
neededmul = s->mid_s16 / (curavg * s->mul);
s->mul = (1.0 - SMOOTH_MUL) * s->mul + SMOOTH_MUL * neededmul;
// clamp the mul coefficient
@ -169,7 +174,7 @@ static void method1_float(af_volnorm_t *s, af_data_t *c)
if (curavg > SIL_FLOAT) // FIXME
{
neededmul = MID_FLOAT / (curavg * s->mul);
neededmul = s->mid_float / (curavg * s->mul);
s->mul = (1.0 - SMOOTH_MUL) * s->mul + SMOOTH_MUL * neededmul;
// clamp the mul coefficient
@ -215,7 +220,7 @@ static void method2_int16(af_volnorm_t *s, af_data_t *c)
avg /= (float)totallen;
if (avg >= SIL_S16)
{
s->mul = MID_S16 / avg;
s->mul = s->mid_s16 / avg;
s->mul = clamp(s->mul, MUL_MIN, MUL_MAX);
}
}
@ -265,7 +270,7 @@ static void method2_float(af_volnorm_t *s, af_data_t *c)
avg /= (float)totallen;
if (avg >= SIL_FLOAT)
{
s->mul = MID_FLOAT / avg;
s->mul = s->mid_float / avg;
s->mul = clamp(s->mul, MUL_MIN, MUL_MAX);
}
}
@ -319,8 +324,10 @@ static int open(af_instance_t* af){
return AF_ERROR;
((af_volnorm_t*)af->setup)->mul = MUL_INIT;
((af_volnorm_t*)af->setup)->lastavg = MID_S16;
((af_volnorm_t*)af->setup)->lastavg = ((float)SHRT_MAX) * DEFAULT_TARGET;
((af_volnorm_t*)af->setup)->idx = 0;
((af_volnorm_t*)af->setup)->mid_s16 = ((float)SHRT_MAX) * DEFAULT_TARGET;
((af_volnorm_t*)af->setup)->mid_float = ((float)INT_MAX) * DEFAULT_TARGET;
for (i = 0; i < NSAMPLES; i++)
{
((af_volnorm_t*)af->setup)->mem[i].len = 0;