114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
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/*
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* Audio Frame Queue
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* Copyright (c) 2012 Justin Ruggles
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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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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "audio_frame_queue.h"
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#include "internal.h"
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#include "libavutil/avassert.h"
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av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
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{
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afq->avctx = avctx;
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afq->remaining_delay = avctx->initial_padding;
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afq->remaining_samples = avctx->initial_padding;
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afq->frame_count = 0;
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}
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void ff_af_queue_close(AudioFrameQueue *afq)
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{
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if(afq->frame_count)
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av_log(afq->avctx, AV_LOG_WARNING, "%d frames left in the queue on closing\n", afq->frame_count);
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av_freep(&afq->frames);
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memset(afq, 0, sizeof(*afq));
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}
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int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
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{
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AudioFrame *new = av_fast_realloc(afq->frames, &afq->frame_alloc, sizeof(*afq->frames)*(afq->frame_count+1));
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if(!new)
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return AVERROR(ENOMEM);
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afq->frames = new;
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new += afq->frame_count;
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/* get frame parameters */
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new->duration = f->nb_samples;
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new->duration += afq->remaining_delay;
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if (f->pts != AV_NOPTS_VALUE) {
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new->pts = av_rescale_q(f->pts,
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afq->avctx->time_base,
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(AVRational){ 1, afq->avctx->sample_rate });
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new->pts -= afq->remaining_delay;
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if(afq->frame_count && new[-1].pts >= new->pts)
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av_log(afq->avctx, AV_LOG_WARNING, "Queue input is backward in time\n");
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} else {
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new->pts = AV_NOPTS_VALUE;
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}
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afq->remaining_delay = 0;
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/* add frame sample count */
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afq->remaining_samples += f->nb_samples;
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afq->frame_count++;
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return 0;
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}
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void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
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int64_t *duration)
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{
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int64_t out_pts = AV_NOPTS_VALUE;
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int removed_samples = 0;
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int i;
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if (afq->frame_count || afq->frame_alloc) {
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if (afq->frames->pts != AV_NOPTS_VALUE)
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out_pts = afq->frames->pts;
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}
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if(!afq->frame_count)
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av_log(afq->avctx, AV_LOG_WARNING, "Trying to remove %d samples, but the queue is empty\n", nb_samples);
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if (pts)
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*pts = ff_samples_to_time_base(afq->avctx, out_pts);
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for(i=0; nb_samples && i<afq->frame_count; i++){
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int n= FFMIN(afq->frames[i].duration, nb_samples);
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afq->frames[i].duration -= n;
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nb_samples -= n;
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removed_samples += n;
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if(afq->frames[i].pts != AV_NOPTS_VALUE)
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afq->frames[i].pts += n;
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}
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afq->remaining_samples -= removed_samples;
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i -= i && afq->frames[i-1].duration;
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memmove(afq->frames, afq->frames + i, sizeof(*afq->frames) * (afq->frame_count - i));
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afq->frame_count -= i;
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if(nb_samples){
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av_assert0(!afq->frame_count);
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av_assert0(afq->remaining_samples == afq->remaining_delay);
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if(afq->frames && afq->frames[0].pts != AV_NOPTS_VALUE)
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afq->frames[0].pts += nb_samples;
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av_log(afq->avctx, AV_LOG_DEBUG, "Trying to remove %d more samples than there are in the queue\n", nb_samples);
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}
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if (duration)
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*duration = ff_samples_to_time_base(afq->avctx, removed_samples);
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}
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