ref: f06e6548b588f7af272479600ed519ba3f4da155
dir: /src/speexdsp.c/
/* libSoX effect: SpeexDsp effect to apply processing from libspeexdsp.
*
* Copyright 1999-2009 Chris Bagwell And SoX Contributors
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "sox_i.h"
#ifdef HAVE_SPEEXDSP
#include <speex/speex_types.h>
#include <speex/speex_preprocess.h>
/* Private data for effect */
typedef struct speexdsp_priv_t {
size_t buffer_end; /* Index of the end of the buffer. */
size_t buffer_ipos; /* Index for the next input sample. */
size_t buffer_opos; /* Index of the next sample that has not been drained. */
int16_t* buffer; /* Work buffer. */
SpeexPreprocessState* sps;/* DSP state. */
size_t agc; /* Param: Automatic Gain Control target volume level: 0 to disable, or 1-100 (target volume). */
size_t denoise; /* Param: Denoise: 0 to disable, or maximum noise attenuation in dB. */
size_t dereverb; /* Param: Dereverb: 0 to disable, 1 to enable. */
size_t frames_per_second; /* Param: Used to compute buffer size from sample rate. */
size_t samples_per_frame; /* Param: Used to compute buffer size directly. Default is to use frames_per_second instead. */
} priv_t;
static int get_param(
int* pArgc,
char*** pArgv,
size_t* pParam,
size_t default_val,
size_t min_valid,
size_t max_valid)
{
*pParam = default_val;
if (*pArgc > 1 && (*pArgv)[1][0] != '-')
{
char* arg_end;
*pParam = strtoul((*pArgv)[1], &arg_end, 0);
if (!arg_end || arg_end[0] || *pParam < min_valid || max_valid <= *pParam)
return 0;
--*pArgc;
++*pArgv;
}
return 1;
}
/*
* Process command-line options but don't do other
* initialization now: effp->in_signal & effp->out_signal are not
* yet filled in.
*/
static int getopts(sox_effect_t* effp, int argc, char** argv)
{
priv_t* p = (priv_t*)effp->priv;
const size_t agcDefault = 100;
const size_t denoiseDefault = 15;
const size_t fpsDefault = 50;
for (argc--, argv++; argc; argc--, argv++)
{
if (!strcasecmp("-agc", argv[0]))
{
/* AGC level argument is optional. If not specified, it defaults to agcDefault.
If specified, it must be from 0 to 100. */
if (!get_param(&argc, &argv, &p->agc, agcDefault, 0, 100))
{
lsx_fail("Invalid argument \"%s\" to -agc parameter - expected number from 0 to 100.", argv[1]);
return lsx_usage(effp);
}
}
else if (!strcasecmp("-denoise", argv[0]))
{
/* Denoise level argument is optional. If not specified, it defaults to denoiseDefault.
If specified, it must be from 0 to 100. */
if (!get_param(&argc, &argv, &p->denoise, denoiseDefault, 0, 100))
{
lsx_fail("Invalid argument \"%s\" to -denoise parameter - expected number from 0 to 100.", argv[1]);
return lsx_usage(effp);
}
}
else if (!strcasecmp("-dereverb", argv[0]))
{
p->dereverb = 1;
}
else if (!strcasecmp("-spf", argv[0]))
{
/* If samples_per_frame option is given, argument is required and must be
greater than 0. */
if (!get_param(&argc, &argv, &p->samples_per_frame, 0, 1, 1000000000) || !p->samples_per_frame)
{
lsx_fail("Invalid argument \"%s\" to -spf parameter - expected positive number.", argv[1]);
return lsx_usage(effp);
}
}
else if (!strcasecmp("-fps", argv[0]))
{
/* If frames_per_second option is given, argument is required and must be
from 1 to 100. This will be used later to compute samples_per_frame once
we know the sample rate). */
if (!get_param(&argc, &argv, &p->frames_per_second, 0, 1, 100) || !p->frames_per_second)
{
lsx_fail("Invalid argument \"%s\" to -fps parameter - expected number from 1 to 100.", argv[1]);
return lsx_usage(effp);
}
}
else
{
lsx_fail("Invalid parameter \"%s\".", argv[0]);
return lsx_usage(effp);
}
}
if (!p->frames_per_second)
p->frames_per_second = fpsDefault;
if (!p->agc && !p->denoise && !p->dereverb)
{
lsx_report("No features specified. Enabling default settings \"-agc %u -denoise %u\".", agcDefault, denoiseDefault);
p->agc = agcDefault;
p->denoise = denoiseDefault;
}
return SOX_SUCCESS;
}
/*
* Do anything required when you stop reading samples.
*/
static int stop(sox_effect_t* effp)
{
priv_t* p = (priv_t*)effp->priv;
if (p->sps)
{
speex_preprocess_state_destroy(p->sps);
p->sps = NULL;
}
if (p->buffer)
{
free(p->buffer);
p->buffer = NULL;
}
return SOX_SUCCESS;
}
/*
* Prepare processing.
* Do all initializations.
*/
static int start(sox_effect_t* effp)
{
priv_t* p = (priv_t*)effp->priv;
int result = SOX_SUCCESS;
spx_int32_t int_val;
float float_val;
if (p->samples_per_frame)
{
p->buffer_end = p->samples_per_frame;
}
else
{
p->buffer_end = effp->in_signal.rate / p->frames_per_second;
if (!p->buffer_end)
{
lsx_fail("frames_per_second too large for the current sample rate.");
return SOX_EOF;
}
}
p->buffer_opos = p->buffer_end;
effp->out_signal.precision = 16;
p->buffer = lsx_malloc(p->buffer_end * sizeof(p->buffer[0]));
if (!p->buffer)
{
result = SOX_ENOMEM;
goto Done;
}
p->sps = speex_preprocess_state_init((int)p->buffer_end, (int)(effp->in_signal.rate + .5));
if (!p->sps)
{
lsx_fail("Failed to initialize preprocessor DSP.");
result = SOX_EOF;
goto Done;
}
int_val = p->agc ? 1 : 2;
speex_preprocess_ctl(p->sps, SPEEX_PREPROCESS_SET_AGC, &int_val);
if (p->agc)
{
float_val = p->agc * 327.68f;
speex_preprocess_ctl(p->sps, SPEEX_PREPROCESS_SET_AGC_LEVEL, &float_val);
}
int_val = p->denoise ? 1 : 2;
speex_preprocess_ctl(p->sps, SPEEX_PREPROCESS_SET_DENOISE, &int_val);
if (p->denoise)
{
int_val = -(spx_int32_t)p->denoise;
speex_preprocess_ctl(p->sps, SPEEX_PREPROCESS_SET_NOISE_SUPPRESS, &int_val);
}
int_val = p->dereverb ? 1 : 2;
speex_preprocess_ctl(p->sps, SPEEX_PREPROCESS_SET_DEREVERB, &int_val);
Done:
if (result != SOX_SUCCESS)
stop(effp);
return result;
}
/*
* Process up to *isamp samples from ibuf and produce up to *osamp samples
* in obuf. Write back the actual numbers of samples to *isamp and *osamp.
* Return SOX_SUCCESS or, if error occurs, SOX_EOF.
*/
static int flow(
sox_effect_t* effp,
const sox_sample_t* ibuf,
sox_sample_t* obuf,
size_t* isamp,
size_t* osamp)
{
priv_t* p = (priv_t*)effp->priv;
size_t ibuf_pos = 0;
size_t ibuf_end = *isamp;
size_t obuf_pos = 0;
size_t obuf_end = *osamp;
size_t end_pos;
SOX_SAMPLE_LOCALS;
for (;;)
{
/* Write any processed data in working buffer to the output buffer. */
end_pos = obuf_pos + min(p->buffer_end - p->buffer_opos, obuf_end - obuf_pos);
for (; obuf_pos < end_pos; obuf_pos++, p->buffer_opos++)
obuf[obuf_pos] = SOX_SIGNED_16BIT_TO_SAMPLE(p->buffer[p->buffer_opos], dummy);
if (p->buffer_opos != p->buffer_end)
break; /* Output buffer is full and we still have more processed data. */
/* Fill working buffer from input buffer. */
end_pos = ibuf_pos + min(p->buffer_end - p->buffer_ipos, ibuf_end - ibuf_pos);
for (; ibuf_pos < end_pos; ibuf_pos++, p->buffer_ipos++)
p->buffer[p->buffer_ipos] = SOX_SAMPLE_TO_SIGNED_16BIT(ibuf[ibuf_pos], effp->clips);
if (p->buffer_ipos != p->buffer_end)
break; /* Working buffer is not full and there is no more input data. */
speex_preprocess_run(p->sps, p->buffer);
p->buffer_ipos = 0;
p->buffer_opos = 0;
}
*isamp = ibuf_pos;
*osamp = obuf_pos;
return SOX_SUCCESS;
}
/*
* Drain out remaining samples if the effect generates any.
*/
static int drain(sox_effect_t* effp, sox_sample_t* obuf, size_t* osamp)
{
priv_t* p = (priv_t*)effp->priv;
size_t obuf_pos = 0;
size_t obuf_end = *osamp;
size_t i;
size_t end_pos;
/* Input that hasn't been processed yet? */
if (p->buffer_ipos != 0)
{
/* DSP only works on full frames, so fill the remaining space with 0s. */
for (i = p->buffer_ipos; i < p->buffer_end; i++)
p->buffer[i] = 0;
speex_preprocess_run(p->sps, p->buffer);
p->buffer_end = p->buffer_ipos;
p->buffer_ipos = 0;
p->buffer_opos = 0;
}
end_pos = obuf_pos + min(p->buffer_end - p->buffer_opos, obuf_end - obuf_pos);
for (; obuf_pos < end_pos; obuf_pos++, p->buffer_opos++)
obuf[obuf_pos] = SOX_SIGNED_16BIT_TO_SAMPLE(p->buffer[p->buffer_opos], dummy);
*osamp = obuf_pos;
return
p->buffer_opos != p->buffer_end
? SOX_SUCCESS
: SOX_EOF;
}
/*
* Function returning effect descriptor. This should be the only
* externally visible object.
*/
const sox_effect_handler_t* lsx_speexdsp_effect_fn(void)
{
/*
* Effect descriptor.
* If no specific processing is needed for any of
* the 6 functions, then the function above can be deleted
* and NULL used in place of the its name below.
*/
static sox_effect_handler_t descriptor = {
"speexdsp", 0, SOX_EFF_PREC | SOX_EFF_GAIN | SOX_EFF_ALPHA,
getopts, start, flow, drain, stop, NULL, sizeof(priv_t)
};
static char const * lines[] = {
"Uses the Speex DSP library to improve perceived sound quality.",
"If no options are specified, the -agc and -denoise features are enabled.",
"Options:",
"-agc [target_level] Enable automatic gain control, and optionally specify a",
" target volume level from 1-100 (default is 100).",
"-denoise [max_dB] Enable noise reduction, and optionally specify the max",
" attenuation (default is 15).",
"-dereverb Enable reverb reduction.",
"-fps frames_per_second Specify the number of frames per second from 1-100",
" (default is 20).",
"-spf samples_per_frame Specify the number of samples per frame. Default is to",
" use the -fps setting.",
};
static char * usage;
descriptor.usage = lsx_usage_lines(&usage, lines, array_length(lines));
return &descriptor;
}
#endif /* HAVE_SPEEXDSP */