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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * Copyright (c) 2013 Nicolas George |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public License |
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| 8 | * as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | * GNU Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public License |
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| 17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include "libavutil/avassert.h" |
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| 22 | #include "avfilter.h" |
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| 23 | #include "bufferqueue.h" |
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| 24 | #include "framesync.h" |
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| 25 | #include "internal.h" |
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| 26 | |||
| 27 | #define OFFSET(member) offsetof(FFFrameSync, member) |
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| 28 | |||
| 29 | static const char *framesync_name(void *ptr) |
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| 30 | { |
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| 31 | return "framesync"; |
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| 32 | } |
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| 33 | |||
| 34 | static const AVClass framesync_class = { |
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| 35 | .version = LIBAVUTIL_VERSION_INT, |
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| 36 | .class_name = "framesync", |
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| 37 | .item_name = framesync_name, |
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| 38 | .category = AV_CLASS_CATEGORY_FILTER, |
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| 39 | .option = NULL, |
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| 40 | .parent_log_context_offset = OFFSET(parent), |
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| 41 | }; |
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| 42 | |||
| 43 | enum { |
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| 44 | STATE_BOF, |
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| 45 | STATE_RUN, |
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| 46 | STATE_EOF, |
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| 47 | }; |
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| 48 | |||
| 49 | void ff_framesync_init(FFFrameSync *fs, void *parent, unsigned nb_in) |
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| 50 | { |
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| 51 | fs->class = &framesync_class; |
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| 52 | fs->parent = parent; |
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| 53 | fs->nb_in = nb_in; |
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| 54 | } |
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| 55 | |||
| 56 | static void framesync_sync_level_update(FFFrameSync *fs) |
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| 57 | { |
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| 58 | unsigned i, level = 0; |
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| 59 | |||
| 60 | for (i = 0; i < fs->nb_in; i++) |
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| 61 | if (fs->in[i].state != STATE_EOF) |
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| 62 | level = FFMAX(level, fs->in[i].sync); |
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| 63 | av_assert0(level <= fs->sync_level); |
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| 64 | if (level < fs->sync_level) |
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| 65 | av_log(fs, AV_LOG_VERBOSE, "Sync level %u\n", level); |
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| 66 | if (level) |
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| 67 | fs->sync_level = level; |
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| 68 | else |
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| 69 | fs->eof = 1; |
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| 70 | } |
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| 71 | |||
| 72 | int ff_framesync_configure(FFFrameSync *fs) |
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| 73 | { |
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| 74 | unsigned i; |
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| 75 | int64_t gcd, lcm; |
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| 76 | |||
| 77 | if (!fs->time_base.num) { |
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| 78 | for (i = 0; i < fs->nb_in; i++) { |
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| 79 | if (fs->in[i].sync) { |
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| 80 | if (fs->time_base.num) { |
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| 81 | gcd = av_gcd(fs->time_base.den, fs->in[i].time_base.den); |
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| 82 | lcm = (fs->time_base.den / gcd) * fs->in[i].time_base.den; |
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| 83 | if (lcm < AV_TIME_BASE / 2) { |
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| 84 | fs->time_base.den = lcm; |
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| 85 | fs->time_base.num = av_gcd(fs->time_base.num, |
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| 86 | fs->in[i].time_base.num); |
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| 87 | } else { |
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| 88 | fs->time_base.num = 1; |
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| 89 | fs->time_base.den = AV_TIME_BASE; |
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| 90 | break; |
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| 91 | } |
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| 92 | } else { |
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| 93 | fs->time_base = fs->in[i].time_base; |
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| 94 | } |
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| 95 | } |
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| 96 | } |
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| 97 | if (!fs->time_base.num) { |
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| 98 | av_log(fs, AV_LOG_ERROR, "Impossible to set time base\n"); |
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| 99 | return AVERROR(EINVAL); |
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| 100 | } |
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| 101 | av_log(fs, AV_LOG_VERBOSE, "Selected %d/%d time base\n", |
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| 102 | fs->time_base.num, fs->time_base.den); |
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| 103 | } |
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| 104 | |||
| 105 | for (i = 0; i < fs->nb_in; i++) |
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| 106 | fs->in[i].pts = fs->in[i].pts_next = AV_NOPTS_VALUE; |
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| 107 | fs->sync_level = UINT_MAX; |
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| 108 | framesync_sync_level_update(fs); |
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| 109 | |||
| 110 | return 0; |
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| 111 | } |
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| 112 | |||
| 113 | static void framesync_advance(FFFrameSync *fs) |
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| 114 | { |
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| 115 | int latest; |
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| 116 | unsigned i; |
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| 117 | int64_t pts; |
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| 118 | |||
| 119 | if (fs->eof) |
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| 120 | return; |
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| 121 | while (!fs->frame_ready) { |
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| 122 | latest = -1; |
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| 123 | for (i = 0; i < fs->nb_in; i++) { |
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| 124 | if (!fs->in[i].have_next) { |
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| 125 | if (latest < 0 || fs->in[i].pts < fs->in[latest].pts) |
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| 126 | latest = i; |
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| 127 | } |
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| 128 | } |
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| 129 | if (latest >= 0) { |
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| 130 | fs->in_request = latest; |
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| 131 | break; |
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| 132 | } |
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| 133 | |||
| 134 | pts = fs->in[0].pts_next; |
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| 135 | for (i = 1; i < fs->nb_in; i++) |
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| 136 | if (fs->in[i].pts_next < pts) |
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| 137 | pts = fs->in[i].pts_next; |
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| 138 | if (pts == INT64_MAX) { |
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| 139 | fs->eof = 1; |
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| 140 | break; |
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| 141 | } |
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| 142 | for (i = 0; i < fs->nb_in; i++) { |
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| 143 | if (fs->in[i].pts_next == pts || |
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| 144 | (fs->in[i].before == EXT_INFINITY && |
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| 145 | fs->in[i].state == STATE_BOF)) { |
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| 146 | av_frame_free(&fs->in[i].frame); |
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| 147 | fs->in[i].frame = fs->in[i].frame_next; |
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| 148 | fs->in[i].pts = fs->in[i].pts_next; |
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| 149 | fs->in[i].frame_next = NULL; |
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| 150 | fs->in[i].pts_next = AV_NOPTS_VALUE; |
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| 151 | fs->in[i].have_next = 0; |
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| 152 | fs->in[i].state = fs->in[i].frame ? STATE_RUN : STATE_EOF; |
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| 153 | if (fs->in[i].sync == fs->sync_level && fs->in[i].frame) |
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| 154 | fs->frame_ready = 1; |
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| 155 | if (fs->in[i].state == STATE_EOF && |
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| 156 | fs->in[i].after == EXT_STOP) |
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| 157 | fs->eof = 1; |
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| 158 | } |
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| 159 | } |
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| 160 | if (fs->eof) |
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| 161 | fs->frame_ready = 0; |
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| 162 | if (fs->frame_ready) |
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| 163 | for (i = 0; i < fs->nb_in; i++) |
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| 164 | if ((fs->in[i].state == STATE_BOF && |
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| 165 | fs->in[i].before == EXT_STOP)) |
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| 166 | fs->frame_ready = 0; |
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| 167 | fs->pts = pts; |
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| 168 | } |
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| 169 | } |
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| 170 | |||
| 171 | static int64_t framesync_pts_extrapolate(FFFrameSync *fs, unsigned in, |
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| 172 | int64_t pts) |
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| 173 | { |
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| 174 | /* Possible enhancement: use the link's frame rate */ |
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| 175 | return pts + 1; |
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| 176 | } |
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| 177 | |||
| 178 | static void framesync_inject_frame(FFFrameSync *fs, unsigned in, AVFrame *frame) |
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| 179 | { |
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| 180 | int64_t pts; |
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| 181 | |||
| 182 | av_assert0(!fs->in[in].have_next); |
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| 183 | if (frame) { |
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| 184 | pts = av_rescale_q(frame->pts, fs->in[in].time_base, fs->time_base); |
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| 185 | frame->pts = pts; |
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| 186 | } else { |
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| 187 | pts = fs->in[in].state != STATE_RUN || fs->in[in].after == EXT_INFINITY |
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| 188 | ? INT64_MAX : framesync_pts_extrapolate(fs, in, fs->in[in].pts); |
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| 189 | fs->in[in].sync = 0; |
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| 190 | framesync_sync_level_update(fs); |
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| 191 | } |
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| 192 | fs->in[in].frame_next = frame; |
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| 193 | fs->in[in].pts_next = pts; |
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| 194 | fs->in[in].have_next = 1; |
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| 195 | } |
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| 196 | |||
| 197 | int ff_framesync_add_frame(FFFrameSync *fs, unsigned in, AVFrame *frame) |
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| 198 | { |
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| 199 | av_assert1(in < fs->nb_in); |
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| 200 | if (!fs->in[in].have_next) |
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| 201 | framesync_inject_frame(fs, in, frame); |
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| 202 | else |
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| 203 | ff_bufqueue_add(fs, &fs->in[in].queue, frame); |
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| 204 | return 0; |
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| 205 | } |
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| 206 | |||
| 207 | void ff_framesync_next(FFFrameSync *fs) |
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| 208 | { |
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| 209 | unsigned i; |
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| 210 | |||
| 211 | av_assert0(!fs->frame_ready); |
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| 212 | for (i = 0; i < fs->nb_in; i++) |
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| 213 | if (!fs->in[i].have_next && fs->in[i].queue.available) |
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| 214 | framesync_inject_frame(fs, i, ff_bufqueue_get(&fs->in[i].queue)); |
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| 215 | fs->frame_ready = 0; |
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| 216 | framesync_advance(fs); |
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| 217 | } |
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| 218 | |||
| 219 | void ff_framesync_drop(FFFrameSync *fs) |
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| 220 | { |
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| 221 | fs->frame_ready = 0; |
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| 222 | } |
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| 223 | |||
| 224 | int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe, |
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| 225 | unsigned get) |
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| 226 | { |
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| 227 | AVFrame *frame; |
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| 228 | unsigned need_copy = 0, i; |
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| 229 | int64_t pts_next; |
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| 230 | int ret; |
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| 231 | |||
| 232 | if (!fs->in[in].frame) { |
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| 233 | *rframe = NULL; |
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| 234 | return 0; |
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| 235 | } |
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| 236 | frame = fs->in[in].frame; |
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| 237 | if (get) { |
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| 238 | /* Find out if we need to copy the frame: is there another sync |
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| 239 | stream, and do we know if its current frame will outlast this one? */ |
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| 240 | pts_next = fs->in[in].have_next ? fs->in[in].pts_next : INT64_MAX; |
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| 241 | for (i = 0; i < fs->nb_in && !need_copy; i++) |
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| 242 | if (i != in && fs->in[i].sync && |
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| 243 | (!fs->in[i].have_next || fs->in[i].pts_next < pts_next)) |
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| 244 | need_copy = 1; |
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| 245 | if (need_copy) { |
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| 246 | if (!(frame = av_frame_clone(frame))) |
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| 247 | return AVERROR(ENOMEM); |
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| 248 | if ((ret = av_frame_make_writable(frame)) < 0) { |
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| 249 | av_frame_free(&frame); |
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| 250 | return ret; |
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| 251 | } |
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| 252 | } else { |
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| 253 | fs->in[in].frame = NULL; |
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| 254 | } |
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| 255 | fs->frame_ready = 0; |
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| 256 | } |
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| 257 | *rframe = frame; |
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| 258 | return 0; |
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| 259 | } |
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| 260 | |||
| 261 | void ff_framesync_uninit(FFFrameSync *fs) |
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| 262 | { |
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| 263 | unsigned i; |
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| 264 | |||
| 265 | for (i = 0; i < fs->nb_in; i++) { |
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| 266 | av_frame_free(&fs->in[i].frame); |
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| 267 | av_frame_free(&fs->in[i].frame_next); |
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| 268 | ff_bufqueue_discard_all(&fs->in[i].queue); |
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| 269 | } |
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| 270 | } |
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| 271 | |||
| 272 | int ff_framesync_process_frame(FFFrameSync *fs, unsigned all) |
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| 273 | { |
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| 274 | int ret, count = 0; |
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| 275 | |||
| 276 | av_assert0(fs->on_event); |
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| 277 | while (1) { |
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| 278 | ff_framesync_next(fs); |
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| 279 | if (fs->eof || !fs->frame_ready) |
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| 280 | break; |
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| 281 | if ((ret = fs->on_event(fs)) < 0) |
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| 282 | return ret; |
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| 283 | ff_framesync_drop(fs); |
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| 284 | count++; |
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| 285 | if (!all) |
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| 286 | break; |
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| 287 | } |
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| 288 | if (!count && fs->eof) |
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| 289 | return AVERROR_EOF; |
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| 290 | return count; |
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| 291 | } |
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| 292 | |||
| 293 | int ff_framesync_filter_frame(FFFrameSync *fs, AVFilterLink *inlink, |
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| 294 | AVFrame *in) |
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| 295 | { |
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| 296 | int ret; |
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| 297 | |||
| 298 | if ((ret = ff_framesync_process_frame(fs, 1)) < 0) |
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| 299 | return ret; |
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| 300 | if ((ret = ff_framesync_add_frame(fs, FF_INLINK_IDX(inlink), in)) < 0) |
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| 301 | return ret; |
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| 302 | if ((ret = ff_framesync_process_frame(fs, 0)) < 0) |
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| 303 | return ret; |
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| 304 | return 0; |
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| 305 | } |
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| 306 | |||
| 307 | int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink) |
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| 308 | { |
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| 309 | AVFilterContext *ctx = outlink->src; |
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| 310 | int input, ret; |
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| 311 | |||
| 312 | if ((ret = ff_framesync_process_frame(fs, 0)) < 0) |
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| 313 | return ret; |
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| 314 | if (ret > 0) |
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| 315 | return 0; |
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| 316 | if (fs->eof) |
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| 317 | return AVERROR_EOF; |
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| 318 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; |
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| 319 | input = fs->in_request; |
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| 320 | ret = ff_request_frame(ctx->inputs[input]); |
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| 321 | if (ret == AVERROR_EOF) { |
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| 322 | if ((ret = ff_framesync_add_frame(fs, input, NULL)) < 0) |
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| 323 | return ret; |
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| 324 | if ((ret = ff_framesync_process_frame(fs, 0)) < 0) |
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| 325 | return ret; |
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| 326 | ret = 0; |
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| 327 | } |
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| 328 | return ret; |
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| 329 | } |