mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 20:19:55 +00:00
120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2013 Nicolas George
|
|
*
|
|
* 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 "avfilter.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct {
|
|
const AVClass *class;
|
|
int sample_rate;
|
|
int rescale_pts;
|
|
} ASetRateContext;
|
|
|
|
#define CONTEXT ASetRateContext
|
|
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
|
|
|
#define OPT_GENERIC(name, field, def, min, max, descr, type, deffield, ...) \
|
|
{ name, descr, offsetof(CONTEXT, field), AV_OPT_TYPE_ ## type, \
|
|
{ .deffield = def }, min, max, FLAGS, __VA_ARGS__ }
|
|
|
|
#define OPT_INT(name, field, def, min, max, descr, ...) \
|
|
OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__)
|
|
|
|
static const AVOption asetrate_options[] = {
|
|
OPT_INT("sample_rate", sample_rate, 44100, 1, INT_MAX, "set the sample rate"),
|
|
OPT_INT("r", sample_rate, 44100, 1, INT_MAX, "set the sample rate"),
|
|
{NULL},
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(asetrate);
|
|
|
|
static av_cold int query_formats(AVFilterContext *ctx)
|
|
{
|
|
ASetRateContext *sr = ctx->priv;
|
|
int sample_rates[] = { sr->sample_rate, -1 };
|
|
|
|
ff_formats_ref(ff_make_format_list(sample_rates),
|
|
&ctx->outputs[0]->in_samplerates);
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int config_props(AVFilterLink *outlink)
|
|
{
|
|
AVFilterContext *ctx = outlink->src;
|
|
ASetRateContext *sr = ctx->priv;
|
|
AVFilterLink *inlink = ctx->inputs[0];
|
|
AVRational intb = ctx->inputs[0]->time_base;
|
|
int inrate = inlink->sample_rate;
|
|
|
|
if (intb.num == 1 && intb.den == inrate) {
|
|
outlink->time_base.num = 1;
|
|
outlink->time_base.den = outlink->sample_rate;
|
|
} else {
|
|
outlink->time_base = intb;
|
|
sr->rescale_pts = 1;
|
|
if (av_q2d(intb) > 1.0 / FFMAX(inrate, outlink->sample_rate))
|
|
av_log(ctx, AV_LOG_WARNING, "Time base is inaccurate\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
ASetRateContext *sr = ctx->priv;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
|
|
frame->sample_rate = outlink->sample_rate;
|
|
if (sr->rescale_pts)
|
|
frame->pts = av_rescale(frame->pts, inlink->sample_rate,
|
|
outlink->sample_rate);
|
|
return ff_filter_frame(outlink, frame);
|
|
}
|
|
|
|
static const AVFilterPad asetrate_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad asetrate_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_props,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_af_asetrate = {
|
|
.name = "asetrate",
|
|
.description = NULL_IF_CONFIG_SMALL("Change the sample rate without "
|
|
"altering the data."),
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(ASetRateContext),
|
|
.inputs = asetrate_inputs,
|
|
.outputs = asetrate_outputs,
|
|
.priv_class = &asetrate_class,
|
|
};
|