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
ff_af_queue_init(AVCodecContext * avctx,AudioFrameQueue * afq)28 av_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
ff_af_queue_close(AudioFrameQueue * afq)36 void 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
ff_af_queue_add(AudioFrameQueue * afq,const AVFrame * f)44 int 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
ff_af_queue_remove(AudioFrameQueue * afq,int nb_samples,int64_t * pts,int64_t * duration)75 void 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