yading@10: /*
yading@10:  * Audio Frame Queue
yading@10:  * Copyright (c) 2012 Justin Ruggles
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/common.h"
yading@10: #include "audio_frame_queue.h"
yading@10: #include "internal.h"
yading@10: #include "libavutil/avassert.h"
yading@10: 
yading@10: void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
yading@10: {
yading@10:     afq->avctx = avctx;
yading@10:     afq->remaining_delay   = avctx->delay;
yading@10:     afq->remaining_samples = avctx->delay;
yading@10:     afq->frame_count       = 0;
yading@10: }
yading@10: 
yading@10: void ff_af_queue_close(AudioFrameQueue *afq)
yading@10: {
yading@10:     if(afq->frame_count)
yading@10:         av_log(afq->avctx, AV_LOG_WARNING, "%d frames left in the queue on closing\n", afq->frame_count);
yading@10:     av_freep(&afq->frames);
yading@10:     memset(afq, 0, sizeof(*afq));
yading@10: }
yading@10: 
yading@10: int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
yading@10: {
yading@10:     AudioFrame *new = av_fast_realloc(afq->frames, &afq->frame_alloc, sizeof(*afq->frames)*(afq->frame_count+1));
yading@10:     if(!new)
yading@10:         return AVERROR(ENOMEM);
yading@10:     afq->frames = new;
yading@10:     new += afq->frame_count;
yading@10: 
yading@10:     /* get frame parameters */
yading@10:     new->duration = f->nb_samples;
yading@10:     new->duration += afq->remaining_delay;
yading@10:     if (f->pts != AV_NOPTS_VALUE) {
yading@10:         new->pts = av_rescale_q(f->pts,
yading@10:                                       afq->avctx->time_base,
yading@10:                                       (AVRational){ 1, afq->avctx->sample_rate });
yading@10:         new->pts -= afq->remaining_delay;
yading@10:         if(afq->frame_count && new[-1].pts >= new->pts)
yading@10:             av_log(afq->avctx, AV_LOG_WARNING, "Queue input is backward in time\n");
yading@10:     } else {
yading@10:         new->pts = AV_NOPTS_VALUE;
yading@10:     }
yading@10:     afq->remaining_delay = 0;
yading@10: 
yading@10:     /* add frame sample count */
yading@10:     afq->remaining_samples += f->nb_samples;
yading@10: 
yading@10:     afq->frame_count++;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
yading@10:                         int *duration)
yading@10: {
yading@10:     int64_t out_pts = AV_NOPTS_VALUE;
yading@10:     int removed_samples = 0;
yading@10:     int i;
yading@10: 
yading@10:     if (afq->frame_count || afq->frame_alloc) {
yading@10:         if (afq->frames->pts != AV_NOPTS_VALUE)
yading@10:             out_pts = afq->frames->pts;
yading@10:     }
yading@10:     if(!afq->frame_count)
yading@10:         av_log(afq->avctx, AV_LOG_WARNING, "Trying to remove %d samples, but the queue is empty\n", nb_samples);
yading@10:     if (pts)
yading@10:         *pts = ff_samples_to_time_base(afq->avctx, out_pts);
yading@10: 
yading@10:     for(i=0; nb_samples && i<afq->frame_count; i++){
yading@10:         int n= FFMIN(afq->frames[i].duration, nb_samples);
yading@10:         afq->frames[i].duration -= n;
yading@10:         nb_samples              -= n;
yading@10:         removed_samples         += n;
yading@10:         if(afq->frames[i].pts != AV_NOPTS_VALUE)
yading@10:             afq->frames[i].pts      += n;
yading@10:     }
yading@10:     afq->remaining_samples -= removed_samples;
yading@10:     i -= i && afq->frames[i-1].duration;
yading@10:     memmove(afq->frames, afq->frames + i, sizeof(*afq->frames) * (afq->frame_count - i));
yading@10:     afq->frame_count -= i;
yading@10: 
yading@10:     if(nb_samples){
yading@10:         av_assert0(!afq->frame_count);
yading@10:         av_assert0(afq->remaining_samples == afq->remaining_delay);
yading@10:         if(afq->frames && afq->frames[0].pts != AV_NOPTS_VALUE)
yading@10:             afq->frames[0].pts += nb_samples;
yading@10:         av_log(afq->avctx, AV_LOG_DEBUG, "Trying to remove %d more samples than there are in the queue\n", nb_samples);
yading@10:     }
yading@10:     if (duration)
yading@10:         *duration = ff_samples_to_time_base(afq->avctx, removed_samples);
yading@10: }