FFmpeg/libavfilter/asrc_anullsrc.c
Michael Niedermayer d46c1c72e4 Merge commit 'e6153f173a49e5bfa70b0c04d2f82930533597b9'
* commit 'e6153f173a49e5bfa70b0c04d2f82930533597b9':
  avopt: Store defaults for AV_OPT_TYPE_INT in the i64 union member

Conflicts:
	libavcodec/libopenjpegdec.c
	libavcodec/libopenjpegenc.c
	libavcodec/libx264.c
	libavcodec/mpeg12enc.c
	libavcodec/options_table.h
	libavcodec/snowenc.c
	libavcodec/tiffenc.c
	libavdevice/v4l2.c
	libavdevice/x11grab.c
	libavfilter/af_amix.c
	libavfilter/af_asyncts.c
	libavfilter/af_join.c
	libavfilter/buffersrc.c
	libavfilter/src_movie.c
	libavfilter/vf_delogo.c
	libavfilter/vf_drawtext.c
	libavformat/http.c
	libavformat/img2dec.c
	libavformat/img2enc.c
	libavformat/movenc.c
	libavformat/mpegenc.c
	libavformat/mpegtsenc.c
	libavformat/options_table.h
	libavformat/segment.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-09-05 14:33:32 +02:00

138 lines
4.7 KiB
C

/*
* Copyright 2010 S.N. Hemanth Meenakshisundaram <smeenaks ucsd edu>
* Copyright 2010 Stefano Sabatini <stefano.sabatini-lala poste it>
*
* 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
* null audio source
*/
#include <inttypes.h>
#include <stdio.h>
#include "audio.h"
#include "avfilter.h"
#include "internal.h"
#include "libavutil/audioconvert.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
typedef struct {
const AVClass *class;
char *channel_layout_str;
uint64_t channel_layout;
char *sample_rate_str;
int sample_rate;
int nb_samples; ///< number of samples per requested frame
int64_t pts;
} ANullContext;
#define OFFSET(x) offsetof(ANullContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption anullsrc_options[]= {
{ "channel_layout", "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
{ "cl", "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
{ "sample_rate", "set sample rate", OFFSET(sample_rate_str) , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
{ "r", "set sample rate", OFFSET(sample_rate_str) , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
{ "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
{ "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
{ NULL },
};
AVFILTER_DEFINE_CLASS(anullsrc);
static int init(AVFilterContext *ctx, const char *args)
{
ANullContext *null = ctx->priv;
int ret;
null->class = &anullsrc_class;
av_opt_set_defaults(null);
if ((ret = (av_set_options_string(null, args, "=", ":"))) < 0)
return ret;
if ((ret = ff_parse_sample_rate(&null->sample_rate,
null->sample_rate_str, ctx)) < 0)
return ret;
if ((ret = ff_parse_channel_layout(&null->channel_layout,
null->channel_layout_str, ctx)) < 0)
return ret;
return 0;
}
static int config_props(AVFilterLink *outlink)
{
ANullContext *null = outlink->src->priv;
char buf[128];
int chans_nb;
outlink->sample_rate = null->sample_rate;
outlink->channel_layout = null->channel_layout;
chans_nb = av_get_channel_layout_nb_channels(null->channel_layout);
av_get_channel_layout_string(buf, sizeof(buf), chans_nb, null->channel_layout);
av_log(outlink->src, AV_LOG_VERBOSE,
"sample_rate:%d channel_layout:'%s' nb_samples:%d\n",
null->sample_rate, buf, null->nb_samples);
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
ANullContext *null = outlink->src->priv;
AVFilterBufferRef *samplesref;
samplesref =
ff_get_audio_buffer(outlink, AV_PERM_WRITE, null->nb_samples);
samplesref->pts = null->pts;
samplesref->pos = -1;
samplesref->audio->channel_layout = null->channel_layout;
samplesref->audio->sample_rate = outlink->sample_rate;
ff_filter_samples(outlink, avfilter_ref_buffer(samplesref, ~0));
avfilter_unref_buffer(samplesref);
null->pts += null->nb_samples;
return 0;
}
AVFilter avfilter_asrc_anullsrc = {
.name = "anullsrc",
.description = NULL_IF_CONFIG_SMALL("Null audio source, return empty audio frames."),
.init = init,
.priv_size = sizeof(ANullContext),
.inputs = (const AVFilterPad[]) {{ .name = NULL}},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_props,
.request_frame = request_frame, },
{ .name = NULL}},
.priv_class = &anullsrc_class,
};