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avfilter: add apad filter
This filter pads an audio stream with silence It can together with -shortest be used to extend audio streams to the same length as video. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -45,6 +45,7 @@ version <next>:
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- SGI RLE 8-bit decoder
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- Silicon Graphics Motion Video Compressor 1 & 2 decoder
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- Silicon Graphics Movie demuxer
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- apad filter
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version 1.0:
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@ -409,6 +409,11 @@ stream ends. The default value is 2 seconds.
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Pass the audio source unchanged to the output.
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@section apad
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Pad the end of a audio stream with silence, this can be used together with
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-shortest to extend audio streams to the same length as the video stream.
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@section aresample
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Resample the input audio to the specified parameters. If none are specified
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@ -53,6 +53,7 @@ OBJS-$(CONFIG_AFORMAT_FILTER) += af_aformat.o
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OBJS-$(CONFIG_AMERGE_FILTER) += af_amerge.o
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OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o
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OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o
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OBJS-$(CONFIG_APAD_FILTER) += af_apad.o
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OBJS-$(CONFIG_ARESAMPLE_FILTER) += af_aresample.o
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OBJS-$(CONFIG_ASELECT_FILTER) += f_select.o
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OBJS-$(CONFIG_ASENDCMD_FILTER) += f_sendcmd.o
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116
libavfilter/af_apad.c
Normal file
116
libavfilter/af_apad.c
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@ -0,0 +1,116 @@
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/*
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* Copyright (c) 2012 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/**
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* @file
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* audio pad filter.
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*
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* Based on af_aresample.c
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "libavutil/samplefmt.h"
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#include "libavutil/avassert.h"
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#include "avfilter.h"
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#include "audio.h"
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#include "internal.h"
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typedef struct {
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int64_t next_pts;
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} APadContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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APadContext *apad = ctx->priv;
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apad->next_pts = AV_NOPTS_VALUE;
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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APadContext *apad = ctx->priv;
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apad->next_pts = frame->pts + av_rescale_q(frame->audio->nb_samples, (AVRational){1, inlink->sample_rate}, inlink->time_base);
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return ff_filter_frame(ctx->outputs[0], frame);
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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APadContext *apad = ctx->priv;
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int ret;
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ret = ff_request_frame(ctx->inputs[0]);
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if (ret == AVERROR_EOF) {
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int n_out = 4096;
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AVFilterBufferRef *outsamplesref = ff_get_audio_buffer(outlink, AV_PERM_WRITE, n_out);
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if (!outsamplesref)
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return AVERROR(ENOMEM);
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av_assert0(outsamplesref->audio->sample_rate == outlink->sample_rate);
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av_assert0(outsamplesref->audio->nb_samples == n_out);
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av_samples_set_silence(outsamplesref->extended_data, 0,
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n_out,
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outsamplesref->audio->channels,
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outsamplesref->format);
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outsamplesref->pts = apad->next_pts;
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if (apad->next_pts != AV_NOPTS_VALUE)
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apad->next_pts += av_rescale_q(n_out, (AVRational){1, outlink->sample_rate}, outlink->time_base);
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return ff_filter_frame(outlink, outsamplesref);
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}
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return ret;
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}
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static const AVFilterPad apad_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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.min_perms = AV_PERM_READ,
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},
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{ NULL },
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};
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static const AVFilterPad apad_outputs[] = {
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{
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.name = "default",
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.request_frame = request_frame,
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.type = AVMEDIA_TYPE_AUDIO,
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},
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{ NULL },
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};
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AVFilter avfilter_af_apad = {
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.name = "apad",
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.description = NULL_IF_CONFIG_SMALL("Pad audio with silence."),
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.init = init,
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.priv_size = sizeof(APadContext),
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.inputs = apad_inputs,
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.outputs = apad_outputs,
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};
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@ -45,6 +45,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (AMERGE, amerge, af);
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REGISTER_FILTER (AMIX, amix, af);
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REGISTER_FILTER (ANULL, anull, af);
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REGISTER_FILTER (APAD, apad, af);
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REGISTER_FILTER (ARESAMPLE, aresample, af);
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REGISTER_FILTER (ASELECT, aselect, af);
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REGISTER_FILTER (ASENDCMD, asendcmd, af);
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@ -29,8 +29,8 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 3
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#define LIBAVFILTER_VERSION_MINOR 27
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#define LIBAVFILTER_VERSION_MICRO 102
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#define LIBAVFILTER_VERSION_MINOR 28
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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