| 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 | |
| 28 | av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq) |
| 29 | { |
| 30 | afq->avctx = avctx; |
| 31 | afq->remaining_delay = avctx->delay; |
| 32 | afq->remaining_samples = avctx->delay; |
| 33 | afq->frame_count = 0; |
| 34 | } |
| 35 | |
| 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 | |
| 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 | |
| 75 | void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, |
| 76 | int *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 | } |