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115 lines
4.1 KiB
115 lines
4.1 KiB
/* |
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* Copyright (c) 2012 Andrey Utkin |
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* Copyright (c) 2012 Stefano Sabatini |
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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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* @file |
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* Filter that changes number of samples on single output operation |
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*/ |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/opt.h" |
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#include "avfilter.h" |
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#include "audio.h" |
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#include "filters.h" |
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typedef struct ASNSContext { |
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const AVClass *class; |
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int nb_out_samples; ///< how many samples to output |
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int pad; |
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} ASNSContext; |
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#define OFFSET(x) offsetof(ASNSContext, x) |
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption asetnsamples_options[] = { |
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{ "nb_out_samples", "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS }, |
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{ "n", "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS }, |
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{ "pad", "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS }, |
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{ "p", "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(asetnsamples); |
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static int activate(AVFilterContext *ctx) |
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{ |
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AVFilterLink *inlink = ctx->inputs[0]; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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ASNSContext *s = ctx->priv; |
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AVFrame *frame = NULL, *pad_frame; |
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int ret; |
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
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if (ctx->is_disabled) |
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ret = ff_inlink_consume_frame(inlink, &frame); |
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else |
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ret = ff_inlink_consume_samples(inlink, s->nb_out_samples, s->nb_out_samples, &frame); |
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if (ret < 0) |
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return ret; |
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if (ret > 0) { |
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if (!s->pad || ctx->is_disabled || frame->nb_samples == s->nb_out_samples) |
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return ff_filter_frame(outlink, frame); |
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pad_frame = ff_get_audio_buffer(outlink, s->nb_out_samples); |
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if (!pad_frame) { |
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av_frame_free(&frame); |
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return AVERROR(ENOMEM); |
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} |
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ret = av_frame_copy_props(pad_frame, frame); |
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if (ret < 0) { |
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av_frame_free(&pad_frame); |
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av_frame_free(&frame); |
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return ret; |
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} |
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av_samples_copy(pad_frame->extended_data, frame->extended_data, |
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0, 0, frame->nb_samples, frame->ch_layout.nb_channels, frame->format); |
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av_samples_set_silence(pad_frame->extended_data, frame->nb_samples, |
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s->nb_out_samples - frame->nb_samples, frame->ch_layout.nb_channels, |
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frame->format); |
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av_frame_free(&frame); |
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return ff_filter_frame(outlink, pad_frame); |
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} |
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FF_FILTER_FORWARD_STATUS(inlink, outlink); |
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if (ff_inlink_queued_samples(inlink) >= s->nb_out_samples) { |
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ff_filter_set_ready(ctx, 100); |
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return 0; |
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} |
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FF_FILTER_FORWARD_WANTED(outlink, inlink); |
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return FFERROR_NOT_READY; |
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} |
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const AVFilter ff_af_asetnsamples = { |
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.name = "asetnsamples", |
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.description = NULL_IF_CONFIG_SMALL("Set the number of samples for each output audio frames."), |
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.priv_size = sizeof(ASNSContext), |
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.priv_class = &asetnsamples_class, |
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FILTER_INPUTS(ff_audio_default_filterpad), |
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FILTER_OUTPUTS(ff_audio_default_filterpad), |
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.activate = activate, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
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.process_command = ff_filter_process_command, |
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};
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