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