328 lines
14 KiB
C
328 lines
14 KiB
C
/*
|
|
* Copyright (c) 2013 Paul B Mahol
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* fade audio filter
|
|
*/
|
|
|
|
#include "libavutil/opt.h"
|
|
#include "audio.h"
|
|
#include "avfilter.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct {
|
|
const AVClass *class;
|
|
int type;
|
|
int curve;
|
|
int nb_samples;
|
|
int64_t start_sample;
|
|
int64_t duration;
|
|
int64_t start_time;
|
|
|
|
void (*fade_samples)(uint8_t **dst, uint8_t * const *src,
|
|
int nb_samples, int channels, int direction,
|
|
int64_t start, int range, int curve);
|
|
} AudioFadeContext;
|
|
|
|
enum CurveType { TRI, QSIN, ESIN, HSIN, LOG, IPAR, QUA, CUB, SQU, CBR, PAR, EXP, IQSIN, IHSIN, DESE, DESI, NB_CURVES };
|
|
|
|
#define OFFSET(x) offsetof(AudioFadeContext, x)
|
|
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
|
|
|
static const AVOption afade_options[] = {
|
|
{ "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS, "type" },
|
|
{ "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS, "type" },
|
|
{ "in", "fade-in", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "type" },
|
|
{ "out", "fade-out", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "type" },
|
|
{ "start_sample", "set number of first sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS },
|
|
{ "ss", "set number of first sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS },
|
|
{ "nb_samples", "set number of samples for fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS },
|
|
{ "ns", "set number of samples for fade duration", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS },
|
|
{ "start_time", "set time to start fading", OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
|
|
{ "st", "set time to start fading", OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
|
|
{ "duration", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
|
|
{ "d", "set fade duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT32_MAX, FLAGS },
|
|
{ "curve", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve" },
|
|
{ "c", "set fade curve type", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, 0, NB_CURVES - 1, FLAGS, "curve" },
|
|
{ "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, FLAGS, "curve" },
|
|
{ "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, FLAGS, "curve" },
|
|
{ "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, FLAGS, "curve" },
|
|
{ "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, FLAGS, "curve" },
|
|
{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, FLAGS, "curve" },
|
|
{ "ipar", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = IPAR }, 0, 0, FLAGS, "curve" },
|
|
{ "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, FLAGS, "curve" },
|
|
{ "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, FLAGS, "curve" },
|
|
{ "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, FLAGS, "curve" },
|
|
{ "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, FLAGS, "curve" },
|
|
{ "par", "parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, "curve" },
|
|
{ "exp", "exponential", 0, AV_OPT_TYPE_CONST, {.i64 = EXP }, 0, 0, FLAGS, "curve" },
|
|
{ "iqsin", "inverted quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IQSIN}, 0, 0, FLAGS, "curve" },
|
|
{ "ihsin", "inverted half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = IHSIN}, 0, 0, FLAGS, "curve" },
|
|
{ "dese", "double-exponential seat", 0, AV_OPT_TYPE_CONST, {.i64 = DESE }, 0, 0, FLAGS, "curve" },
|
|
{ "desi", "double-exponential sigmoid", 0, AV_OPT_TYPE_CONST, {.i64 = DESI }, 0, 0, FLAGS, "curve" },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(afade);
|
|
|
|
static av_cold int init(AVFilterContext *ctx)
|
|
{
|
|
AudioFadeContext *s = ctx->priv;
|
|
|
|
if (INT64_MAX - s->nb_samples < s->start_sample)
|
|
return AVERROR(EINVAL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
AVFilterFormats *formats;
|
|
AVFilterChannelLayouts *layouts;
|
|
static const enum AVSampleFormat sample_fmts[] = {
|
|
AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,
|
|
AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,
|
|
AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
|
|
AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
|
|
AV_SAMPLE_FMT_NONE
|
|
};
|
|
int ret;
|
|
|
|
layouts = ff_all_channel_layouts();
|
|
if (!layouts)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_set_common_channel_layouts(ctx, layouts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
formats = ff_make_format_list(sample_fmts);
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_set_common_formats(ctx, formats);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
formats = ff_all_samplerates();
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
return ff_set_common_samplerates(ctx, formats);
|
|
}
|
|
|
|
static double fade_gain(int curve, int64_t index, int range)
|
|
{
|
|
double gain;
|
|
|
|
gain = av_clipd(1.0 * index / range, 0, 1.0);
|
|
|
|
switch (curve) {
|
|
case QSIN:
|
|
gain = sin(gain * M_PI / 2.0);
|
|
break;
|
|
case IQSIN:
|
|
gain = 0.636943 * asin(gain);
|
|
break;
|
|
case ESIN:
|
|
gain = 1.0 - cos(M_PI / 4.0 * (pow(2.0*gain - 1, 3) + 1));
|
|
break;
|
|
case HSIN:
|
|
gain = (1.0 - cos(gain * M_PI)) / 2.0;
|
|
break;
|
|
case IHSIN:
|
|
gain = 0.318471 * acos(1 - 2 * gain);
|
|
break;
|
|
case EXP:
|
|
gain = pow(0.1, (1 - gain) * 5.0);
|
|
break;
|
|
case LOG:
|
|
gain = av_clipd(0.0868589 * log(100000 * gain), 0, 1.0);
|
|
break;
|
|
case PAR:
|
|
gain = 1 - sqrt(1 - gain);
|
|
break;
|
|
case IPAR:
|
|
gain = (1 - (1 - gain) * (1 - gain));
|
|
break;
|
|
case QUA:
|
|
gain *= gain;
|
|
break;
|
|
case CUB:
|
|
gain = gain * gain * gain;
|
|
break;
|
|
case SQU:
|
|
gain = sqrt(gain);
|
|
break;
|
|
case CBR:
|
|
gain = cbrt(gain);
|
|
break;
|
|
case DESE:
|
|
gain = gain <= 0.5 ? pow(2 * gain, 1/3.) / 2: 1 - pow(2 * (1 - gain), 1/3.) / 2;
|
|
break;
|
|
case DESI:
|
|
gain = gain <= 0.5 ? pow(2 * gain, 3) / 2: 1 - pow(2 * (1 - gain), 3) / 2;
|
|
break;
|
|
}
|
|
|
|
return gain;
|
|
}
|
|
|
|
#define FADE_PLANAR(name, type) \
|
|
static void fade_samples_## name ##p(uint8_t **dst, uint8_t * const *src, \
|
|
int nb_samples, int channels, int dir, \
|
|
int64_t start, int range, int curve) \
|
|
{ \
|
|
int i, c; \
|
|
\
|
|
for (i = 0; i < nb_samples; i++) { \
|
|
double gain = fade_gain(curve, start + i * dir, range); \
|
|
for (c = 0; c < channels; c++) { \
|
|
type *d = (type *)dst[c]; \
|
|
const type *s = (type *)src[c]; \
|
|
\
|
|
d[i] = s[i] * gain; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
#define FADE(name, type) \
|
|
static void fade_samples_## name (uint8_t **dst, uint8_t * const *src, \
|
|
int nb_samples, int channels, int dir, \
|
|
int64_t start, int range, int curve) \
|
|
{ \
|
|
type *d = (type *)dst[0]; \
|
|
const type *s = (type *)src[0]; \
|
|
int i, c, k = 0; \
|
|
\
|
|
for (i = 0; i < nb_samples; i++) { \
|
|
double gain = fade_gain(curve, start + i * dir, range); \
|
|
for (c = 0; c < channels; c++, k++) \
|
|
d[k] = s[k] * gain; \
|
|
} \
|
|
}
|
|
|
|
FADE_PLANAR(dbl, double)
|
|
FADE_PLANAR(flt, float)
|
|
FADE_PLANAR(s16, int16_t)
|
|
FADE_PLANAR(s32, int32_t)
|
|
|
|
FADE(dbl, double)
|
|
FADE(flt, float)
|
|
FADE(s16, int16_t)
|
|
FADE(s32, int32_t)
|
|
|
|
static int config_input(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AudioFadeContext *s = ctx->priv;
|
|
|
|
switch (inlink->format) {
|
|
case AV_SAMPLE_FMT_DBL: s->fade_samples = fade_samples_dbl; break;
|
|
case AV_SAMPLE_FMT_DBLP: s->fade_samples = fade_samples_dblp; break;
|
|
case AV_SAMPLE_FMT_FLT: s->fade_samples = fade_samples_flt; break;
|
|
case AV_SAMPLE_FMT_FLTP: s->fade_samples = fade_samples_fltp; break;
|
|
case AV_SAMPLE_FMT_S16: s->fade_samples = fade_samples_s16; break;
|
|
case AV_SAMPLE_FMT_S16P: s->fade_samples = fade_samples_s16p; break;
|
|
case AV_SAMPLE_FMT_S32: s->fade_samples = fade_samples_s32; break;
|
|
case AV_SAMPLE_FMT_S32P: s->fade_samples = fade_samples_s32p; break;
|
|
}
|
|
|
|
if (s->duration)
|
|
s->nb_samples = av_rescale(s->duration, inlink->sample_rate, AV_TIME_BASE);
|
|
if (s->start_time)
|
|
s->start_sample = av_rescale(s->start_time, inlink->sample_rate, AV_TIME_BASE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
|
|
{
|
|
AudioFadeContext *s = inlink->dst->priv;
|
|
AVFilterLink *outlink = inlink->dst->outputs[0];
|
|
int nb_samples = buf->nb_samples;
|
|
AVFrame *out_buf;
|
|
int64_t cur_sample = av_rescale_q(buf->pts, inlink->time_base, (AVRational){1, inlink->sample_rate});
|
|
|
|
if ((!s->type && (s->start_sample + s->nb_samples < cur_sample)) ||
|
|
( s->type && (cur_sample + s->nb_samples < s->start_sample)))
|
|
return ff_filter_frame(outlink, buf);
|
|
|
|
if (av_frame_is_writable(buf)) {
|
|
out_buf = buf;
|
|
} else {
|
|
out_buf = ff_get_audio_buffer(inlink, nb_samples);
|
|
if (!out_buf)
|
|
return AVERROR(ENOMEM);
|
|
av_frame_copy_props(out_buf, buf);
|
|
}
|
|
|
|
if ((!s->type && (cur_sample + nb_samples < s->start_sample)) ||
|
|
( s->type && (s->start_sample + s->nb_samples < cur_sample))) {
|
|
av_samples_set_silence(out_buf->extended_data, 0, nb_samples,
|
|
av_frame_get_channels(out_buf), out_buf->format);
|
|
} else {
|
|
int64_t start;
|
|
|
|
if (!s->type)
|
|
start = cur_sample - s->start_sample;
|
|
else
|
|
start = s->start_sample + s->nb_samples - cur_sample;
|
|
|
|
s->fade_samples(out_buf->extended_data, buf->extended_data,
|
|
nb_samples, av_frame_get_channels(buf),
|
|
s->type ? -1 : 1, start,
|
|
s->nb_samples, s->curve);
|
|
}
|
|
|
|
if (buf != out_buf)
|
|
av_frame_free(&buf);
|
|
|
|
return ff_filter_frame(outlink, out_buf);
|
|
}
|
|
|
|
static const AVFilterPad avfilter_af_afade_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_input,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_af_afade_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_afade = {
|
|
.name = "afade",
|
|
.description = NULL_IF_CONFIG_SMALL("Fade in/out input audio."),
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(AudioFadeContext),
|
|
.init = init,
|
|
.inputs = avfilter_af_afade_inputs,
|
|
.outputs = avfilter_af_afade_outputs,
|
|
.priv_class = &afade_class,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
|
|
};
|