libavfilter/asrc_anoisesrc.c - manifest_repos/ffmpeg - Git at Google

 /*
  * Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
  *
  * 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
  */

 #include "libavutil/opt.h"
 #include "audio.h"
 #include "avfilter.h"
 #include "filters.h"
 #include "internal.h"
 #include "libavutil/lfg.h"
 #include "libavutil/random_seed.h"

 typedef struct ANoiseSrcContext {
     const AVClass *class;
     int sample_rate;
     double amplitude;
     int64_t duration;
     int color;
     int64_t seed;
     int nb_samples;

     int64_t pts;
     int infinite;
     double (*filter)(double white, double *buf, double half_amplitude);
     double buf[7];
     AVLFG c;
 } ANoiseSrcContext;

 enum NoiseMode {
     NM_WHITE,
     NM_PINK,
     NM_BROWN,
     NM_BLUE,
     NM_VIOLET,
     NM_VELVET,
     NM_NB
 };

 #define OFFSET(x) offsetof(ANoiseSrcContext, x)
 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

 static const AVOption anoisesrc_options[] = {
     { "sample_rate",  "set sample rate",  OFFSET(sample_rate),  AV_OPT_TYPE_INT,       {.i64 = 48000},     15,  INT_MAX,    FLAGS },
     { "r",            "set sample rate",  OFFSET(sample_rate),  AV_OPT_TYPE_INT,       {.i64 = 48000},     15,  INT_MAX,    FLAGS },
     { "amplitude",    "set amplitude",    OFFSET(amplitude),    AV_OPT_TYPE_DOUBLE,    {.dbl = 1.},        0.,  1.,         FLAGS },
     { "a",            "set amplitude",    OFFSET(amplitude),    AV_OPT_TYPE_DOUBLE,    {.dbl = 1.},        0.,  1.,         FLAGS },
     { "duration",     "set duration",     OFFSET(duration),     AV_OPT_TYPE_DURATION,  {.i64 =  0},         0,  INT64_MAX,  FLAGS },
     { "d",            "set duration",     OFFSET(duration),     AV_OPT_TYPE_DURATION,  {.i64 =  0},         0,  INT64_MAX,  FLAGS },
     { "color",        "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
     { "colour",       "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
     { "c",            "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
     {     "white",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_WHITE},   0,  0,          FLAGS, "color" },
     {     "pink",     0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_PINK},    0,  0,          FLAGS, "color" },
     {     "brown",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_BROWN},   0,  0,          FLAGS, "color" },
     {     "blue",     0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_BLUE},    0,  0,          FLAGS, "color" },
     {     "violet",   0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_VIOLET},  0,  0,          FLAGS, "color" },
     {     "velvet",   0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_VELVET},  0,  0,          FLAGS, "color" },
     { "seed",         "set random seed",  OFFSET(seed),         AV_OPT_TYPE_INT64,     {.i64 = -1},        -1,  UINT_MAX,   FLAGS },
     { "s",            "set random seed",  OFFSET(seed),         AV_OPT_TYPE_INT64,     {.i64 = -1},        -1,  UINT_MAX,   FLAGS },
     { "nb_samples",   "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
     { "n",            "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
     {NULL}
 };

 AVFILTER_DEFINE_CLASS(anoisesrc);

 static av_cold int query_formats(AVFilterContext *ctx)
 {
     ANoiseSrcContext *s = ctx->priv;
     static const int64_t chlayouts[] = { AV_CH_LAYOUT_MONO, -1 };
     int sample_rates[] = { s->sample_rate, -1 };
     static const enum AVSampleFormat sample_fmts[] = {
         AV_SAMPLE_FMT_DBL,
         AV_SAMPLE_FMT_NONE
     };

     AVFilterFormats *formats;
     AVFilterChannelLayouts *layouts;
     int 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;

     layouts = ff_make_format64_list(chlayouts);
     if (!layouts)
         return AVERROR(ENOMEM);
     ret = ff_set_common_channel_layouts(ctx, layouts);
     if (ret < 0)
         return ret;

     formats = ff_make_format_list(sample_rates);
     if (!formats)
         return AVERROR(ENOMEM);
     return ff_set_common_samplerates(ctx, formats);
 }

 static double white_filter(double white, double *buf, double ha)
 {
     return white;
 }

 static double pink_filter(double white, double *buf, double ha)
 {
     double pink;

     /* http://www.musicdsp.org/files/pink.txt */
     buf[0] = 0.99886 * buf[0] + white * 0.0555179;
     buf[1] = 0.99332 * buf[1] + white * 0.0750759;
     buf[2] = 0.96900 * buf[2] + white * 0.1538520;
     buf[3] = 0.86650 * buf[3] + white * 0.3104856;
     buf[4] = 0.55000 * buf[4] + white * 0.5329522;
     buf[5] = -0.7616 * buf[5] - white * 0.0168980;
     pink = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
     buf[6] = white * 0.115926;
     return pink * 0.11;
 }

 static double blue_filter(double white, double *buf, double ha)
 {
     double blue;

     /* Same as pink_filter but subtract the offsets rather than add */
     buf[0] = 0.0555179 * white - 0.99886 * buf[0];
     buf[1] = 0.0750759 * white - 0.99332 * buf[1];
     buf[2] = 0.1538520 * white - 0.96900 * buf[2];
     buf[3] = 0.3104856 * white - 0.86650 * buf[3];
     buf[4] = 0.5329522 * white - 0.55000 * buf[4];
     buf[5] = -0.016898 * white + 0.76160 * buf[5];
     blue = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
     buf[6] = white * 0.115926;
     return blue * 0.11;
 }

 static double brown_filter(double white, double *buf, double ha)
 {
     double brown;

     brown = ((0.02 * white) + buf[0]) / 1.02;
     buf[0] = brown;
     return brown * 3.5;
 }

 static double violet_filter(double white, double *buf, double ha)
 {
     double violet;

     violet = ((0.02 * white) - buf[0]) / 1.02;
     buf[0] = violet;
     return violet * 3.5;
 }

 static double velvet_filter(double white, double *buf, double ha)
 {
     return 2. * ha * ((white > ha) - (white < -ha));
 }

 static av_cold int config_props(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     ANoiseSrcContext *s = ctx->priv;

     if (s->seed == -1)
         s->seed = av_get_random_seed();
     av_lfg_init(&s->c, s->seed);

     if (s->duration == 0)
         s->infinite = 1;
     s->duration = av_rescale(s->duration, s->sample_rate, AV_TIME_BASE);

     switch (s->color) {
     case NM_WHITE:  s->filter = white_filter;  break;
     case NM_PINK:   s->filter = pink_filter;   break;
     case NM_BROWN:  s->filter = brown_filter;  break;
     case NM_BLUE:   s->filter = blue_filter;   break;
     case NM_VIOLET: s->filter = violet_filter; break;
     case NM_VELVET: s->filter = velvet_filter; break;
     }

     return 0;
 }

 static int activate(AVFilterContext *ctx)
 {
     AVFilterLink *outlink = ctx->outputs[0];
     ANoiseSrcContext *s = ctx->priv;
     AVFrame *frame;
     int nb_samples, i;
     double *dst;

     if (!ff_outlink_frame_wanted(outlink))
         return FFERROR_NOT_READY;

     if (!s->infinite && s->duration <= 0) {
         ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
         return 0;
     } else if (!s->infinite && s->duration < s->nb_samples) {
         nb_samples = s->duration;
     } else {
         nb_samples = s->nb_samples;
     }

     if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
         return AVERROR(ENOMEM);

     dst = (double *)frame->data[0];
     for (i = 0; i < nb_samples; i++) {
         double white;
         white = s->amplitude * ((2 * ((double) av_lfg_get(&s->c) / 0xffffffff)) - 1);
         dst[i] = s->filter(white, s->buf, s->amplitude * 0.5);
     }

     if (!s->infinite)
         s->duration -= nb_samples;

     frame->pts = s->pts;
     s->pts    += nb_samples;
     return ff_filter_frame(outlink, frame);
 }

 static const AVFilterPad anoisesrc_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_AUDIO,
         .config_props  = config_props,
     },
     { NULL }
 };

 AVFilter ff_asrc_anoisesrc = {
     .name          = "anoisesrc",
     .description   = NULL_IF_CONFIG_SMALL("Generate a noise audio signal."),
     .query_formats = query_formats,
     .priv_size     = sizeof(ANoiseSrcContext),
     .inputs        = NULL,
     .activate      = activate,
     .outputs       = anoisesrc_outputs,
     .priv_class    = &anoisesrc_class,
 };
	/*
	* Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
	*
	* 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
	*/

	#include "libavutil/opt.h"
	#include "audio.h"
	#include "avfilter.h"
	#include "filters.h"
	#include "internal.h"
	#include "libavutil/lfg.h"
	#include "libavutil/random_seed.h"

	typedef struct ANoiseSrcContext {
	const AVClass *class;
	int sample_rate;
	double amplitude;
	int64_t duration;
	int color;
	int64_t seed;
	int nb_samples;

	int64_t pts;
	int infinite;
	double (filter)(double white, double buf, double half_amplitude);
	double buf[7];
	AVLFG c;
	} ANoiseSrcContext;

	enum NoiseMode {
	NM_WHITE,
	NM_PINK,
	NM_BROWN,
	NM_BLUE,
	NM_VIOLET,
	NM_VELVET,
	NM_NB
	};

	#define OFFSET(x) offsetof(ANoiseSrcContext, x)
	#define FLAGS AV_OPT_FLAG_AUDIO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM

	static const AVOption anoisesrc_options[] = {
	{ "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS },
	{ "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS },
	{ "amplitude", "set amplitude", OFFSET(amplitude), AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS },
	{ "a", "set amplitude", OFFSET(amplitude), AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS },
	{ "duration", "set duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
	{ "d", "set duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
	{ "color", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NM_NB - 1, FLAGS, "color" },
	{ "colour", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NM_NB - 1, FLAGS, "color" },
	{ "c", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NM_NB - 1, FLAGS, "color" },
	{ "white", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_WHITE}, 0, 0, FLAGS, "color" },
	{ "pink", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_PINK}, 0, 0, FLAGS, "color" },
	{ "brown", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_BROWN}, 0, 0, FLAGS, "color" },
	{ "blue", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_BLUE}, 0, 0, FLAGS, "color" },
	{ "violet", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_VIOLET}, 0, 0, FLAGS, "color" },
	{ "velvet", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_VELVET}, 0, 0, FLAGS, "color" },
	{ "seed", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS },
	{ "s", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS },
	{ "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
	{ "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
	{NULL}
	};

	AVFILTER_DEFINE_CLASS(anoisesrc);

	static av_cold int query_formats(AVFilterContext *ctx)
	{
	ANoiseSrcContext *s = ctx->priv;
	static const int64_t chlayouts[] = { AV_CH_LAYOUT_MONO, -1 };
	int sample_rates[] = { s->sample_rate, -1 };
	static const enum AVSampleFormat sample_fmts[] = {
	AV_SAMPLE_FMT_DBL,
	AV_SAMPLE_FMT_NONE
	};

	AVFilterFormats *formats;
	AVFilterChannelLayouts *layouts;
	int 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;

	layouts = ff_make_format64_list(chlayouts);
	if (!layouts)
	return AVERROR(ENOMEM);
	ret = ff_set_common_channel_layouts(ctx, layouts);
	if (ret < 0)
	return ret;

	formats = ff_make_format_list(sample_rates);
	if (!formats)
	return AVERROR(ENOMEM);
	return ff_set_common_samplerates(ctx, formats);
	}

	static double white_filter(double white, double *buf, double ha)
	{
	return white;
	}

	static double pink_filter(double white, double *buf, double ha)
	{
	double pink;

	/* http://www.musicdsp.org/files/pink.txt */
	buf[0] = 0.99886 * buf[0] + white * 0.0555179;
	buf[1] = 0.99332 * buf[1] + white * 0.0750759;
	buf[2] = 0.96900 * buf[2] + white * 0.1538520;
	buf[3] = 0.86650 * buf[3] + white * 0.3104856;
	buf[4] = 0.55000 * buf[4] + white * 0.5329522;
	buf[5] = -0.7616 * buf[5] - white * 0.0168980;
	pink = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
	buf[6] = white * 0.115926;
	return pink * 0.11;
	}

	static double blue_filter(double white, double *buf, double ha)
	{
	double blue;

	/* Same as pink_filter but subtract the offsets rather than add */
	buf[0] = 0.0555179 * white - 0.99886 * buf[0];
	buf[1] = 0.0750759 * white - 0.99332 * buf[1];
	buf[2] = 0.1538520 * white - 0.96900 * buf[2];
	buf[3] = 0.3104856 * white - 0.86650 * buf[3];
	buf[4] = 0.5329522 * white - 0.55000 * buf[4];
	buf[5] = -0.016898 * white + 0.76160 * buf[5];
	blue = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
	buf[6] = white * 0.115926;
	return blue * 0.11;
	}

	static double brown_filter(double white, double *buf, double ha)
	{
	double brown;

	brown = ((0.02 * white) + buf[0]) / 1.02;
	buf[0] = brown;
	return brown * 3.5;
	}

	static double violet_filter(double white, double *buf, double ha)
	{
	double violet;

	violet = ((0.02 * white) - buf[0]) / 1.02;
	buf[0] = violet;
	return violet * 3.5;
	}

	static double velvet_filter(double white, double *buf, double ha)
	{
	return 2. * ha * ((white > ha) - (white < -ha));
	}

	static av_cold int config_props(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	ANoiseSrcContext *s = ctx->priv;

	if (s->seed == -1)
	s->seed = av_get_random_seed();
	av_lfg_init(&s->c, s->seed);

	if (s->duration == 0)
	s->infinite = 1;
	s->duration = av_rescale(s->duration, s->sample_rate, AV_TIME_BASE);

	switch (s->color) {
	case NM_WHITE: s->filter = white_filter; break;
	case NM_PINK: s->filter = pink_filter; break;
	case NM_BROWN: s->filter = brown_filter; break;
	case NM_BLUE: s->filter = blue_filter; break;
	case NM_VIOLET: s->filter = violet_filter; break;
	case NM_VELVET: s->filter = velvet_filter; break;
	}

	return 0;
	}

	static int activate(AVFilterContext *ctx)
	{
	AVFilterLink *outlink = ctx->outputs[0];
	ANoiseSrcContext *s = ctx->priv;
	AVFrame *frame;
	int nb_samples, i;
	double *dst;

	if (!ff_outlink_frame_wanted(outlink))
	return FFERROR_NOT_READY;

	if (!s->infinite && s->duration <= 0) {
	ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
	return 0;
	} else if (!s->infinite && s->duration < s->nb_samples) {
	nb_samples = s->duration;
	} else {
	nb_samples = s->nb_samples;
	}

	if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
	return AVERROR(ENOMEM);

	dst = (double *)frame->data[0];
	for (i = 0; i < nb_samples; i++) {
	double white;
	white = s->amplitude * ((2 * ((double) av_lfg_get(&s->c) / 0xffffffff)) - 1);
	dst[i] = s->filter(white, s->buf, s->amplitude * 0.5);
	}

	if (!s->infinite)
	s->duration -= nb_samples;

	frame->pts = s->pts;
	s->pts += nb_samples;
	return ff_filter_frame(outlink, frame);
	}

	static const AVFilterPad anoisesrc_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_AUDIO,
	.config_props = config_props,
	},
	{ NULL }
	};

	AVFilter ff_asrc_anoisesrc = {
	.name = "anoisesrc",
	.description = NULL_IF_CONFIG_SMALL("Generate a noise audio signal."),
	.query_formats = query_formats,
	.priv_size = sizeof(ANoiseSrcContext),
	.inputs = NULL,
	.activate = activate,
	.outputs = anoisesrc_outputs,
	.priv_class = &anoisesrc_class,
	};