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69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
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{
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return ff_get_audio_buffer(link->dst->outputs[0], nb_samples);
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}
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AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
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{
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AVFrame *frame = av_frame_alloc();
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int channels = av_get_channel_layout_nb_channels(link->channel_layout);
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int ret;
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if (!frame)
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return NULL;
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frame->nb_samples = nb_samples;
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frame->format = link->format;
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frame->channel_layout = link->channel_layout;
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frame->sample_rate = link->sample_rate;
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ret = av_frame_get_buffer(frame, 0);
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if (ret < 0) {
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av_frame_free(&frame);
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return NULL;
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}
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av_samples_set_silence(frame->extended_data, 0, nb_samples, channels,
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link->format);
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return frame;
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}
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AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
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{
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AVFrame *ret = NULL;
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if (link->dstpad->get_audio_buffer)
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ret = link->dstpad->get_audio_buffer(link, nb_samples);
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if (!ret)
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ret = ff_default_get_audio_buffer(link, nb_samples);
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return ret;
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}
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