| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Generic frame queue | ||
| 3 | * Copyright (c) 2016 Nicolas George | ||
| 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 License | ||
| 9 | * 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 | ||
| 15 | * GNU Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public License | ||
| 18 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., | ||
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #ifndef AVFILTER_FRAMEQUEUE_H | ||
| 23 | #define AVFILTER_FRAMEQUEUE_H | ||
| 24 | |||
| 25 | /** | ||
| 26 | * FFFrameQueue: simple AVFrame queue API | ||
| 27 | * | ||
| 28 | * Note: this API is not thread-safe. Concurrent access to the same queue | ||
| 29 | * must be protected by a mutex or any synchronization mechanism. | ||
| 30 | */ | ||
| 31 | |||
| 32 | #include "libavutil/frame.h" | ||
| 33 | |||
| 34 | typedef struct FFFrameBucket { | ||
| 35 | AVFrame *frame; | ||
| 36 | } FFFrameBucket; | ||
| 37 | |||
| 38 | /** | ||
| 39 | * Structure to hold global options and statistics for frame queues. | ||
| 40 | * | ||
| 41 | * This structure is intended to allow implementing global control of the | ||
| 42 | * frame queues, including memory consumption caps. | ||
| 43 | * | ||
| 44 | * It is currently empty. | ||
| 45 | */ | ||
| 46 | typedef struct FFFrameQueueGlobal { | ||
| 47 | char dummy; /* C does not allow empty structs */ | ||
| 48 | } FFFrameQueueGlobal; | ||
| 49 | |||
| 50 | /** | ||
| 51 | * Queue of AVFrame pointers. | ||
| 52 | */ | ||
| 53 | typedef struct FFFrameQueue { | ||
| 54 | |||
| 55 | /** | ||
| 56 | * Array of allocated buckets, used as a circular buffer. | ||
| 57 | */ | ||
| 58 | FFFrameBucket *queue; | ||
| 59 | |||
| 60 | /** | ||
| 61 | * Size of the array of buckets. | ||
| 62 | */ | ||
| 63 | size_t allocated; | ||
| 64 | |||
| 65 | /** | ||
| 66 | * Tail of the queue. | ||
| 67 | * It is the index in the array of the next frame to take. | ||
| 68 | */ | ||
| 69 | size_t tail; | ||
| 70 | |||
| 71 | /** | ||
| 72 | * Number of currently queued frames. | ||
| 73 | */ | ||
| 74 | size_t queued; | ||
| 75 | |||
| 76 | /** | ||
| 77 | * Pre-allocated bucket for queues of size 1. | ||
| 78 | */ | ||
| 79 | FFFrameBucket first_bucket; | ||
| 80 | |||
| 81 | /** | ||
| 82 | * Total number of frames entered in the queue. | ||
| 83 | */ | ||
| 84 | uint64_t total_frames_head; | ||
| 85 | |||
| 86 | /** | ||
| 87 | * Total number of frames dequeued from the queue. | ||
| 88 | * queued = total_frames_head - total_frames_tail | ||
| 89 | */ | ||
| 90 | uint64_t total_frames_tail; | ||
| 91 | |||
| 92 | /** | ||
| 93 | * Total number of samples entered in the queue. | ||
| 94 | */ | ||
| 95 | uint64_t total_samples_head; | ||
| 96 | |||
| 97 | /** | ||
| 98 | * Total number of samples dequeued from the queue. | ||
| 99 | * queued_samples = total_samples_head - total_samples_tail | ||
| 100 | */ | ||
| 101 | uint64_t total_samples_tail; | ||
| 102 | |||
| 103 | /** | ||
| 104 | * Indicate that samples are skipped | ||
| 105 | */ | ||
| 106 | int samples_skipped; | ||
| 107 | |||
| 108 | } FFFrameQueue; | ||
| 109 | |||
| 110 | /** | ||
| 111 | * Init a global structure. | ||
| 112 | */ | ||
| 113 | void ff_framequeue_global_init(FFFrameQueueGlobal *fqg); | ||
| 114 | |||
| 115 | /** | ||
| 116 | * Init a frame queue and attach it to a global structure. | ||
| 117 | */ | ||
| 118 | void ff_framequeue_init(FFFrameQueue *fq, FFFrameQueueGlobal *fqg); | ||
| 119 | |||
| 120 | /** | ||
| 121 | * Free the queue and all queued frames. | ||
| 122 | */ | ||
| 123 | void ff_framequeue_free(FFFrameQueue *fq); | ||
| 124 | |||
| 125 | /** | ||
| 126 | * Add a frame. | ||
| 127 | * @return >=0 or an AVERROR code. | ||
| 128 | */ | ||
| 129 | int ff_framequeue_add(FFFrameQueue *fq, AVFrame *frame); | ||
| 130 | |||
| 131 | /** | ||
| 132 | * Take the first frame in the queue. | ||
| 133 | * Must not be used with empty queues. | ||
| 134 | */ | ||
| 135 | AVFrame *ff_framequeue_take(FFFrameQueue *fq); | ||
| 136 | |||
| 137 | /** | ||
| 138 | * Access a frame in the queue, without removing it. | ||
| 139 | * The first frame is numbered 0; the designated frame must exist. | ||
| 140 | */ | ||
| 141 | AVFrame *ff_framequeue_peek(FFFrameQueue *fq, size_t idx); | ||
| 142 | |||
| 143 | /** | ||
| 144 | * Get the number of queued frames. | ||
| 145 | */ | ||
| 146 | 8981309 | static inline size_t ff_framequeue_queued_frames(const FFFrameQueue *fq) | |
| 147 | { | ||
| 148 | 8981309 | return fq->queued; | |
| 149 | } | ||
| 150 | |||
| 151 | /** | ||
| 152 | * Get the number of queued samples. | ||
| 153 | */ | ||
| 154 | 654157 | static inline uint64_t ff_framequeue_queued_samples(const FFFrameQueue *fq) | |
| 155 | { | ||
| 156 | 654157 | return fq->total_samples_head - fq->total_samples_tail; | |
| 157 | } | ||
| 158 | |||
| 159 | /** | ||
| 160 | * Update the statistics after a frame accessed using ff_framequeue_peek() | ||
| 161 | * was modified. | ||
| 162 | * Currently used only as a marker. | ||
| 163 | */ | ||
| 164 | 1524 | static inline void ff_framequeue_update_peeked(FFFrameQueue *fq, size_t idx) | |
| 165 | { | ||
| 166 | 1524 | } | |
| 167 | |||
| 168 | /** | ||
| 169 | * Skip samples from the first frame in the queue. | ||
| 170 | * | ||
| 171 | * This function must be used when the first frame was accessed using | ||
| 172 | * ff_framequeue_peek() and samples were consumed from it. | ||
| 173 | * It adapts the data pointers and timestamps of the head frame to account | ||
| 174 | * for the skipped samples. | ||
| 175 | */ | ||
| 176 | void ff_framequeue_skip_samples(FFFrameQueue *fq, size_t samples, AVRational time_base); | ||
| 177 | |||
| 178 | #endif /* AVFILTER_FRAMEQUEUE_H */ | ||
| 179 |