1/*
2 * Audio Frame Queue
3 * Copyright (c) 2012 Justin Ruggles
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavutil/attributes.h"
23#include "libavutil/common.h"
24#include "audio_frame_queue.h"
25#include "internal.h"
26#include "libavutil/avassert.h"
27
28av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
29{
30    afq->avctx = avctx;
31    afq->remaining_delay   = avctx->initial_padding;
32    afq->remaining_samples = avctx->initial_padding;
33    afq->frame_count       = 0;
34}
35
36void ff_af_queue_close(AudioFrameQueue *afq)
37{
38    if(afq->frame_count)
39        av_log(afq->avctx, AV_LOG_WARNING, "%d frames left in the queue on closing\n", afq->frame_count);
40    av_freep(&afq->frames);
41    memset(afq, 0, sizeof(*afq));
42}
43
44int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
45{
46    AudioFrame *new = av_fast_realloc(afq->frames, &afq->frame_alloc, sizeof(*afq->frames)*(afq->frame_count+1));
47    if(!new)
48        return AVERROR(ENOMEM);
49    afq->frames = new;
50    new += afq->frame_count;
51
52    /* get frame parameters */
53    new->duration = f->nb_samples;
54    new->duration += afq->remaining_delay;
55    if (f->pts != AV_NOPTS_VALUE) {
56        new->pts = av_rescale_q(f->pts,
57                                      afq->avctx->time_base,
58                                      (AVRational){ 1, afq->avctx->sample_rate });
59        new->pts -= afq->remaining_delay;
60        if(afq->frame_count && new[-1].pts >= new->pts)
61            av_log(afq->avctx, AV_LOG_WARNING, "Queue input is backward in time\n");
62    } else {
63        new->pts = AV_NOPTS_VALUE;
64    }
65    afq->remaining_delay = 0;
66
67    /* add frame sample count */
68    afq->remaining_samples += f->nb_samples;
69
70    afq->frame_count++;
71
72    return 0;
73}
74
75void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
76                        int64_t *duration)
77{
78    int64_t out_pts = AV_NOPTS_VALUE;
79    int removed_samples = 0;
80    int i;
81
82    if (afq->frame_count || afq->frame_alloc) {
83        if (afq->frames->pts != AV_NOPTS_VALUE)
84            out_pts = afq->frames->pts;
85    }
86    if(!afq->frame_count)
87        av_log(afq->avctx, AV_LOG_WARNING, "Trying to remove %d samples, but the queue is empty\n", nb_samples);
88    if (pts)
89        *pts = ff_samples_to_time_base(afq->avctx, out_pts);
90
91    for(i=0; nb_samples && i<afq->frame_count; i++){
92        int n= FFMIN(afq->frames[i].duration, nb_samples);
93        afq->frames[i].duration -= n;
94        nb_samples              -= n;
95        removed_samples         += n;
96        if(afq->frames[i].pts != AV_NOPTS_VALUE)
97            afq->frames[i].pts      += n;
98    }
99    afq->remaining_samples -= removed_samples;
100    i -= i && afq->frames[i-1].duration;
101    memmove(afq->frames, afq->frames + i, sizeof(*afq->frames) * (afq->frame_count - i));
102    afq->frame_count -= i;
103
104    if(nb_samples){
105        av_assert0(!afq->frame_count);
106        av_assert0(afq->remaining_samples == afq->remaining_delay);
107        if(afq->frames && afq->frames[0].pts != AV_NOPTS_VALUE)
108            afq->frames[0].pts += nb_samples;
109        av_log(afq->avctx, AV_LOG_DEBUG, "Trying to remove %d more samples than there are in the queue\n", nb_samples);
110    }
111    if (duration)
112        *duration = ff_samples_to_time_base(afq->avctx, removed_samples);
113}
114