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/* |
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* Copyright (c) 2013 Nicolas George |
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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 License |
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* 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 |
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* GNU 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 License |
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/opt.h" |
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#include "avfilter.h" |
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#include "internal.h" |
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typedef struct { |
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const AVClass *class; |
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int sample_rate; |
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int rescale_pts; |
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} ASetRateContext; |
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#define CONTEXT ASetRateContext |
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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#define OPT_GENERIC(name, field, def, min, max, descr, type, deffield, ...) \ |
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{ name, descr, offsetof(CONTEXT, field), AV_OPT_TYPE_ ## type, \ |
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{ .deffield = def }, min, max, FLAGS, __VA_ARGS__ } |
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#define OPT_INT(name, field, def, min, max, descr, ...) \ |
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OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__) |
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static const AVOption asetrate_options[] = { |
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OPT_INT("sample_rate", sample_rate, 44100, 1, INT_MAX, "set the sample rate"), |
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OPT_INT("r", sample_rate, 44100, 1, INT_MAX, "set the sample rate"), |
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{NULL}, |
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}; |
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AVFILTER_DEFINE_CLASS(asetrate); |
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static av_cold int query_formats(AVFilterContext *ctx) |
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{ |
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ASetRateContext *sr = ctx->priv; |
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int sample_rates[] = { sr->sample_rate, -1 }; |
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ff_formats_ref(ff_make_format_list(sample_rates), |
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&ctx->outputs[0]->in_samplerates); |
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return 0; |
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} |
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static av_cold int config_props(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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ASetRateContext *sr = ctx->priv; |
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AVFilterLink *inlink = ctx->inputs[0]; |
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AVRational intb = ctx->inputs[0]->time_base; |
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int inrate = inlink->sample_rate; |
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if (intb.num == 1 && intb.den == inrate) { |
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outlink->time_base.num = 1; |
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outlink->time_base.den = outlink->sample_rate; |
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} else { |
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outlink->time_base = intb; |
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sr->rescale_pts = 1; |
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if (av_q2d(intb) > 1.0 / FFMAX(inrate, outlink->sample_rate)) |
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av_log(ctx, AV_LOG_WARNING, "Time base is inaccurate\n"); |
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} |
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return 0; |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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ASetRateContext *sr = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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frame->sample_rate = outlink->sample_rate; |
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if (sr->rescale_pts) |
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frame->pts = av_rescale(frame->pts, inlink->sample_rate, |
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outlink->sample_rate); |
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return ff_filter_frame(outlink, frame); |
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} |
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static const AVFilterPad asetrate_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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}, |
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{ NULL } |
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}; |
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static const AVFilterPad asetrate_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.config_props = config_props, |
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}, |
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{ NULL } |
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}; |
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AVFilter avfilter_af_asetrate = { |
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.name = "asetrate", |
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.description = NULL_IF_CONFIG_SMALL("Change the sample rate without " |
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"altering the data."), |
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.query_formats = query_formats, |
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.priv_size = sizeof(ASetRateContext), |
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.inputs = asetrate_inputs, |
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.outputs = asetrate_outputs, |
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.priv_class = &asetrate_class, |
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}; |