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author | Paul B Mahol <onemda@gmail.com> | 2013-01-17 21:53:27 +0000 |
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committer | Paul B Mahol <onemda@gmail.com> | 2013-01-21 15:20:42 +0000 |
commit | 6ea8a830e8f1eee465174c479840b18b4963d43d (patch) | |
tree | 5ffc84350ba346a2599de549c16d92125d539cc2 | |
parent | 5f61e09a8f28af45d7db1f5e7767d14322255f49 (diff) | |
download | ffmpeg-streaming-6ea8a830e8f1eee465174c479840b18b4963d43d.zip ffmpeg-streaming-6ea8a830e8f1eee465174c479840b18b4963d43d.tar.gz |
afade filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
-rw-r--r-- | Changelog | 1 | ||||
-rw-r--r-- | doc/filters.texi | 77 | ||||
-rw-r--r-- | libavfilter/Makefile | 1 | ||||
-rw-r--r-- | libavfilter/af_afade.c | 307 | ||||
-rw-r--r-- | libavfilter/allfilters.c | 1 | ||||
-rw-r--r-- | libavfilter/version.h | 4 |
6 files changed, 389 insertions, 2 deletions
@@ -8,6 +8,7 @@ version <next>: - Chained Ogg support - Theora Midstream reconfiguration support - EVRC decoder +- audio fade filter version 1.1: diff --git a/doc/filters.texi b/doc/filters.texi index 022815f..ad8b5da 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -282,6 +282,83 @@ aconvert=u8:auto @end example @end itemize +@section afade + +Apply fade-in/out effect to input audio. + +The filter accepts parameters as a list of @var{key}=@var{value} +pairs, separated by ":". + +A description of the accepted parameters follows. + +@table @option +@item type, t +Specify the effect type, can be either @code{in} for fade-in, or +@code{out} for a fade-out effect. Default is @code{in}. + +@item start_sample, ss +Specify the number of the start sample for starting to apply the fade +effect. Default is 0. + +@item nb_samples, ns +Specify the number of samples for which the fade effect has to last. At +the end of the fade-in effect the output audio will have the same +volume as the input audio, at the end of the fade-out transition +the output audio will be silence. Default is 44100. + +@item start_time, st +Specify time in seconds for starting to apply the fade +effect. Default is 0. +If set this option is used instead of @var{start_sample} one. + +@item duration, d +Specify the number of seconds for which the fade effect has to last. At +the end of the fade-in effect the output audio will have the same +volume as the input audio, at the end of the fade-out transition +the output audio will be silence. Default is 0. +If set this option is used instead of @var{nb_samples} one. + +@item curve +Set cuve for fade transition. +@table @option +@item @var{triangular, linear slope (default)} +@code{tri} +@item @var{quarter of sine wave} +@code{qsin} +@item @var{half of sine wave} +@code{esin} +@item @var{exponential sine wave} +@code{hsin} +@item @var{logarithmic} +@code{log} +@item @var{inverted parabola} +@code{par} +@item @var{quadratic} +@code{qua} +@item @var{cubic} +@code{cub} +@item @var{square root} +@code{squ} +@item @var{cubic root} +@code{cbr} +@end table +@end table + +@subsection Examples +@itemize +@item +Fade in first 15 seconds of audio: +@example +afade=t=in:ss=0:d=15 +@end example + +@item +Fade out last 25 seconds of a 900 seconds audio: +@example +afade=t=out:ss=875:d=25 +@end example +@end itemize + @section aformat Set output format constraints for the input audio. The framework will diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 9bb9fa3..5835a7e 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -51,6 +51,7 @@ OBJS-$(CONFIG_AVFORMAT) += lavfutils.o OBJS-$(CONFIG_SWSCALE) += lswsutils.o OBJS-$(CONFIG_ACONVERT_FILTER) += af_aconvert.o +OBJS-$(CONFIG_AFADE_FILTER) += af_afade.o OBJS-$(CONFIG_AFORMAT_FILTER) += af_aformat.o OBJS-$(CONFIG_AMERGE_FILTER) += af_amerge.o OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o diff --git a/libavfilter/af_afade.c b/libavfilter/af_afade.c new file mode 100644 index 0000000..00a05e2 --- /dev/null +++ b/libavfilter/af_afade.c @@ -0,0 +1,307 @@ +/* + * 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; + double duration; + double 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, PAR, QUA, CUB, SQU, CBR }; + +#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", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "type" }, + { "out", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "type" }, + { "start_sample", "set expression of sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS }, + { "ss", "set expression of sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS }, + { "nb_samples", "set expression for fade duration in samples", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS }, + { "ns", "set expression for fade duration in samples", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS }, + { "start_time", "set expression of second to start fading", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 7*24*60*60,FLAGS }, + { "st", "set expression of second to start fading", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 7*24*60*60,FLAGS }, + { "duration", "set expression for fade duration in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 24*60*60, FLAGS }, + { "d", "set expression for fade duration in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 24*60*60, FLAGS }, + { "curve", "set expression for fade curve", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, TRI, CBR, FLAGS, "curve" }, + { "c", "set expression for fade curve", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, TRI, CBR, 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" }, + { "par", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 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" }, + {NULL}, +}; + +AVFILTER_DEFINE_CLASS(afade); + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + AudioFadeContext *afade = ctx->priv; + int ret; + + afade->class = &afade_class; + av_opt_set_defaults(afade); + + if ((ret = av_set_options_string(afade, args, "=", ":")) < 0) + return ret; + + if (INT64_MAX - afade->nb_samples < afade->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 + }; + + layouts = ff_all_channel_layouts(); + if (!layouts) + return AVERROR(ENOMEM); + ff_set_common_channel_layouts(ctx, layouts); + + formats = ff_make_format_list(sample_fmts); + if (!formats) + return AVERROR(ENOMEM); + ff_set_common_formats(ctx, formats); + + formats = ff_all_samplerates(); + if (!formats) + return AVERROR(ENOMEM); + ff_set_common_samplerates(ctx, formats); + + return 0; +} + +static double fade_gain(int curve, int64_t index, int range) +{ + double gain; + + gain = FFMAX(0.0, FFMIN(1.0, 1.0 * index / range)); + + switch (curve) { + case QSIN: + gain = sin(gain * M_PI / 2.0); + 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 LOG: + gain = pow(0.1, (1 - gain) * 5.0); + break; + case PAR: + 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; + } + + 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_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + AudioFadeContext *afade = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + + switch (inlink->format) { + case AV_SAMPLE_FMT_DBL: afade->fade_samples = fade_samples_dbl; break; + case AV_SAMPLE_FMT_DBLP: afade->fade_samples = fade_samples_dblp; break; + case AV_SAMPLE_FMT_FLT: afade->fade_samples = fade_samples_flt; break; + case AV_SAMPLE_FMT_FLTP: afade->fade_samples = fade_samples_fltp; break; + case AV_SAMPLE_FMT_S16: afade->fade_samples = fade_samples_s16; break; + case AV_SAMPLE_FMT_S16P: afade->fade_samples = fade_samples_s16p; break; + case AV_SAMPLE_FMT_S32: afade->fade_samples = fade_samples_s32; break; + case AV_SAMPLE_FMT_S32P: afade->fade_samples = fade_samples_s32p; break; + } + + if (afade->duration) + afade->nb_samples = afade->duration * inlink->sample_rate; + if (afade->start_time) + afade->start_sample = afade->start_time * inlink->sample_rate; + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf) +{ + AudioFadeContext *afade = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + int nb_samples = buf->audio->nb_samples; + AVFilterBufferRef *out_buf; + int64_t cur_sample = av_rescale_q(buf->pts, (AVRational){1, outlink->sample_rate}, outlink->time_base); + + if ((!afade->type && (afade->start_sample + afade->nb_samples < cur_sample)) || + ( afade->type && (cur_sample + afade->nb_samples < afade->start_sample))) + return ff_filter_frame(outlink, buf); + + if (buf->perms & AV_PERM_WRITE) { + out_buf = buf; + } else { + out_buf = ff_get_audio_buffer(inlink, AV_PERM_WRITE, nb_samples); + if (!out_buf) + return AVERROR(ENOMEM); + out_buf->pts = buf->pts; + } + + if ((!afade->type && (cur_sample + nb_samples < afade->start_sample)) || + ( afade->type && (afade->start_sample + afade->nb_samples < cur_sample))) { + av_samples_set_silence(out_buf->extended_data, 0, nb_samples, + out_buf->audio->channels, out_buf->format); + } else { + int64_t start; + + if (!afade->type) + start = cur_sample - afade->start_sample; + else + start = afade->start_sample + afade->nb_samples - cur_sample; + + afade->fade_samples(out_buf->extended_data, buf->extended_data, + nb_samples, buf->audio->channels, + afade->type ? -1 : 1, start, + afade->nb_samples, afade->curve); + } + + if (buf != out_buf) + avfilter_unref_buffer(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, + }, + { NULL } +}; + +static const AVFilterPad avfilter_af_afade_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .config_props = config_output, + }, + { NULL } +}; + +AVFilter avfilter_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, +}; diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index 4815c4a..24df561 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -45,6 +45,7 @@ void avfilter_register_all(void) initialized = 1; REGISTER_FILTER(ACONVERT, aconvert, af); + REGISTER_FILTER(AFADE, afade, af); REGISTER_FILTER(AFORMAT, aformat, af); REGISTER_FILTER(AMERGE, amerge, af); REGISTER_FILTER(AMIX, amix, af); diff --git a/libavfilter/version.h b/libavfilter/version.h index 7b13964..cd79709 100644 --- a/libavfilter/version.h +++ b/libavfilter/version.h @@ -29,8 +29,8 @@ #include "libavutil/avutil.h" #define LIBAVFILTER_VERSION_MAJOR 3 -#define LIBAVFILTER_VERSION_MINOR 32 -#define LIBAVFILTER_VERSION_MICRO 101 +#define LIBAVFILTER_VERSION_MINOR 33 +#define LIBAVFILTER_VERSION_MICRO 100 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \ LIBAVFILTER_VERSION_MINOR, \ |