Compared to dualinput, this API can handle more than two inputs and can generate frames synchronized to any or all input streams.
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| 1 | /* | ||
| 2 | * Copyright (c) 2013 Nicolas George | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public License | ||
| 8 | * as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 14 | * GNU Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public License | ||
| 17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., | ||
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include "libavutil/avassert.h" | ||
| 22 | #include "avfilter.h" | ||
| 23 | #include "bufferqueue.h" | ||
| 24 | #include "framesync.h" | ||
| 25 | #include "internal.h" | ||
| 26 | |||
| 27 | #define OFFSET(member) offsetof(FFFrameSync, member) | ||
| 28 | |||
| 29 | static const char *framesync_name(void *ptr) | ||
| 30 | { | ||
| 31 | return "framesync"; | ||
| 32 | } | ||
| 33 | |||
| 34 | static const AVClass framesync_class = { | ||
| 35 | .version = LIBAVUTIL_VERSION_INT, | ||
| 36 | .class_name = "framesync", | ||
| 37 | .item_name = framesync_name, | ||
| 38 | .category = AV_CLASS_CATEGORY_FILTER, | ||
| 39 | .option = NULL, | ||
| 40 | .parent_log_context_offset = OFFSET(parent), | ||
| 41 | }; | ||
| 42 | |||
| 43 | enum { | ||
| 44 | STATE_BOF, | ||
| 45 | STATE_RUN, | ||
| 46 | STATE_EOF, | ||
| 47 | }; | ||
| 48 | |||
| 49 | void ff_framesync_init(FFFrameSync *fs, void *parent, unsigned nb_in) | ||
| 50 | { | ||
| 51 | fs->class = &framesync_class; | ||
| 52 | fs->parent = parent; | ||
| 53 | fs->nb_in = nb_in; | ||
| 54 | } | ||
| 55 | |||
| 56 | static void framesync_sync_level_update(FFFrameSync *fs) | ||
| 57 | { | ||
| 58 | unsigned i, level = 0; | ||
| 59 | |||
| 60 | for (i = 0; i < fs->nb_in; i++) | ||
| 61 | if (fs->in[i].state != STATE_EOF) | ||
| 62 | level = FFMAX(level, fs->in[i].sync); | ||
| 63 | av_assert0(level <= fs->sync_level); | ||
| 64 | if (level < fs->sync_level) | ||
| 65 | av_log(fs, AV_LOG_VERBOSE, "Sync level %u\n", level); | ||
| 66 | if (level) | ||
| 67 | fs->sync_level = level; | ||
| 68 | else | ||
| 69 | fs->eof = 1; | ||
| 70 | } | ||
| 71 | |||
| 72 | int ff_framesync_configure(FFFrameSync *fs) | ||
| 73 | { | ||
| 74 | unsigned i; | ||
| 75 | int64_t gcd, lcm; | ||
| 76 | |||
| 77 | if (!fs->time_base.num) { | ||
| 78 | for (i = 0; i < fs->nb_in; i++) { | ||
| 79 | if (fs->in[i].sync) { | ||
| 80 | if (fs->time_base.num) { | ||
| 81 | gcd = av_gcd(fs->time_base.den, fs->in[i].time_base.den); | ||
| 82 | lcm = (fs->time_base.den / gcd) * fs->in[i].time_base.den; | ||
| 83 | if (lcm < AV_TIME_BASE / 2) { | ||
| 84 | fs->time_base.den = lcm; | ||
| 85 | fs->time_base.num = av_gcd(fs->time_base.num, | ||
| 86 | fs->in[i].time_base.num); | ||
| 87 | } else { | ||
| 88 | fs->time_base.num = 1; | ||
| 89 | fs->time_base.den = AV_TIME_BASE; | ||
| 90 | break; | ||
| 91 | } | ||
| 92 | } else { | ||
| 93 | fs->time_base = fs->in[i].time_base; | ||
| 94 | } | ||
| 95 | } | ||
| 96 | } | ||
| 97 | if (!fs->time_base.num) { | ||
| 98 | av_log(fs, AV_LOG_ERROR, "Impossible to set time base\n"); | ||
| 99 | return AVERROR(EINVAL); | ||
| 100 | } | ||
| 101 | av_log(fs, AV_LOG_VERBOSE, "Selected %d/%d time base\n", | ||
| 102 | fs->time_base.num, fs->time_base.den); | ||
| 103 | } | ||
| 104 | |||
| 105 | for (i = 0; i < fs->nb_in; i++) | ||
| 106 | fs->in[i].pts = fs->in[i].pts_next = AV_NOPTS_VALUE; | ||
| 107 | fs->sync_level = UINT_MAX; | ||
| 108 | framesync_sync_level_update(fs); | ||
| 109 | |||
| 110 | return 0; | ||
| 111 | } | ||
| 112 | |||
| 113 | static void framesync_advance(FFFrameSync *fs) | ||
| 114 | { | ||
| 115 | int latest; | ||
| 116 | unsigned i; | ||
| 117 | int64_t pts; | ||
| 118 | |||
| 119 | if (fs->eof) | ||
| 120 | return; | ||
| 121 | while (!fs->frame_ready) { | ||
| 122 | latest = -1; | ||
| 123 | for (i = 0; i < fs->nb_in; i++) { | ||
| 124 | if (!fs->in[i].have_next) { | ||
| 125 | if (latest < 0 || fs->in[i].pts < fs->in[latest].pts) | ||
| 126 | latest = i; | ||
| 127 | } | ||
| 128 | } | ||
| 129 | if (latest >= 0) { | ||
| 130 | fs->in_request = latest; | ||
| 131 | break; | ||
| 132 | } | ||
| 133 | |||
| 134 | pts = fs->in[0].pts_next; | ||
| 135 | for (i = 1; i < fs->nb_in; i++) | ||
| 136 | if (fs->in[i].pts_next < pts) | ||
| 137 | pts = fs->in[i].pts_next; | ||
| 138 | if (pts == INT64_MAX) { | ||
| 139 | fs->eof = 1; | ||
| 140 | break; | ||
| 141 | } | ||
| 142 | for (i = 0; i < fs->nb_in; i++) { | ||
| 143 | if (fs->in[i].pts_next == pts || | ||
| 144 | (fs->in[i].before == EXT_INFINITY && | ||
| 145 | fs->in[i].state == STATE_BOF)) { | ||
| 146 | av_frame_free(&fs->in[i].frame); | ||
| 147 | fs->in[i].frame = fs->in[i].frame_next; | ||
| 148 | fs->in[i].pts = fs->in[i].pts_next; | ||
| 149 | fs->in[i].frame_next = NULL; | ||
| 150 | fs->in[i].pts_next = AV_NOPTS_VALUE; | ||
| 151 | fs->in[i].have_next = 0; | ||
| 152 | fs->in[i].state = fs->in[i].frame ? STATE_RUN : STATE_EOF; | ||
| 153 | if (fs->in[i].sync == fs->sync_level && fs->in[i].frame) | ||
| 154 | fs->frame_ready = 1; | ||
| 155 | if (fs->in[i].state == STATE_EOF && | ||
| 156 | fs->in[i].after == EXT_STOP) | ||
| 157 | fs->eof = 1; | ||
| 158 | } | ||
| 159 | } | ||
| 160 | if (fs->eof) | ||
| 161 | fs->frame_ready = 0; | ||
| 162 | if (fs->frame_ready) | ||
| 163 | for (i = 0; i < fs->nb_in; i++) | ||
| 164 | if ((fs->in[i].state == STATE_BOF && | ||
| 165 | fs->in[i].before == EXT_STOP)) | ||
| 166 | fs->frame_ready = 0; | ||
| 167 | fs->pts = pts; | ||
| 168 | } | ||
| 169 | } | ||
| 170 | |||
| 171 | static int64_t framesync_pts_extrapolate(FFFrameSync *fs, unsigned in, | ||
| 172 | int64_t pts) | ||
| 173 | { | ||
| 174 | /* Possible enhancement: use the link's frame rate */ | ||
| 175 | return pts + 1; | ||
| 176 | } | ||
| 177 | |||
| 178 | static void framesync_inject_frame(FFFrameSync *fs, unsigned in, AVFrame *frame) | ||
| 179 | { | ||
| 180 | int64_t pts; | ||
| 181 | |||
| 182 | av_assert0(!fs->in[in].have_next); | ||
| 183 | if (frame) { | ||
| 184 | pts = av_rescale_q(frame->pts, fs->in[in].time_base, fs->time_base); | ||
| 185 | frame->pts = pts; | ||
| 186 | } else { | ||
| 187 | pts = fs->in[in].state != STATE_RUN || fs->in[in].after == EXT_INFINITY | ||
| 188 | ? INT64_MAX : framesync_pts_extrapolate(fs, in, fs->in[in].pts); | ||
| 189 | fs->in[in].sync = 0; | ||
| 190 | framesync_sync_level_update(fs); | ||
| 191 | } | ||
| 192 | fs->in[in].frame_next = frame; | ||
| 193 | fs->in[in].pts_next = pts; | ||
| 194 | fs->in[in].have_next = 1; | ||
| 195 | } | ||
| 196 | |||
| 197 | int ff_framesync_add_frame(FFFrameSync *fs, unsigned in, AVFrame *frame) | ||
| 198 | { | ||
| 199 | av_assert1(in < fs->nb_in); | ||
| 200 | if (!fs->in[in].have_next) | ||
| 201 | framesync_inject_frame(fs, in, frame); | ||
| 202 | else | ||
| 203 | ff_bufqueue_add(fs, &fs->in[in].queue, frame); | ||
| 204 | return 0; | ||
| 205 | } | ||
| 206 | |||
| 207 | void ff_framesync_next(FFFrameSync *fs) | ||
| 208 | { | ||
| 209 | unsigned i; | ||
| 210 | |||
| 211 | av_assert0(!fs->frame_ready); | ||
| 212 | for (i = 0; i < fs->nb_in; i++) | ||
| 213 | if (!fs->in[i].have_next && fs->in[i].queue.available) | ||
| 214 | framesync_inject_frame(fs, i, ff_bufqueue_get(&fs->in[i].queue)); | ||
| 215 | fs->frame_ready = 0; | ||
| 216 | framesync_advance(fs); | ||
| 217 | } | ||
| 218 | |||
| 219 | void ff_framesync_drop(FFFrameSync *fs) | ||
| 220 | { | ||
| 221 | fs->frame_ready = 0; | ||
| 222 | } | ||
| 223 | |||
| 224 | int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe, | ||
| 225 | unsigned get) | ||
| 226 | { | ||
| 227 | AVFrame *frame; | ||
| 228 | unsigned need_copy = 0, i; | ||
| 229 | int64_t pts_next; | ||
| 230 | int ret; | ||
| 231 | |||
| 232 | if (!fs->in[in].frame) { | ||
| 233 | *rframe = NULL; | ||
| 234 | return 0; | ||
| 235 | } | ||
| 236 | frame = fs->in[in].frame; | ||
| 237 | if (get) { | ||
| 238 | /* Find out if we need to copy the frame: is there another sync | ||
| 239 | stream, and do we know if its current frame will outlast this one? */ | ||
| 240 | pts_next = fs->in[in].have_next ? fs->in[in].pts_next : INT64_MAX; | ||
| 241 | for (i = 0; i < fs->nb_in && !need_copy; i++) | ||
| 242 | if (i != in && fs->in[i].sync && | ||
| 243 | (!fs->in[i].have_next || fs->in[i].pts_next < pts_next)) | ||
| 244 | need_copy = 1; | ||
| 245 | if (need_copy) { | ||
| 246 | if (!(frame = av_frame_clone(frame))) | ||
| 247 | return AVERROR(ENOMEM); | ||
| 248 | if ((ret = av_frame_make_writable(frame)) < 0) { | ||
| 249 | av_frame_free(&frame); | ||
| 250 | return ret; | ||
| 251 | } | ||
| 252 | } else { | ||
| 253 | fs->in[in].frame = NULL; | ||
| 254 | } | ||
| 255 | fs->frame_ready = 0; | ||
| 256 | } | ||
| 257 | *rframe = frame; | ||
| 258 | return 0; | ||
| 259 | } | ||
| 260 | |||
| 261 | void ff_framesync_uninit(FFFrameSync *fs) | ||
| 262 | { | ||
| 263 | unsigned i; | ||
| 264 | |||
| 265 | for (i = 0; i < fs->nb_in; i++) { | ||
| 266 | av_frame_free(&fs->in[i].frame); | ||
| 267 | av_frame_free(&fs->in[i].frame_next); | ||
| 268 | ff_bufqueue_discard_all(&fs->in[i].queue); | ||
| 269 | } | ||
| 270 | } | ||
| 271 | |||
| 272 | int ff_framesync_process_frame(FFFrameSync *fs, unsigned all) | ||
| 273 | { | ||
| 274 | int ret, count = 0; | ||
| 275 | |||
| 276 | av_assert0(fs->on_event); | ||
| 277 | while (1) { | ||
| 278 | ff_framesync_next(fs); | ||
| 279 | if (fs->eof || !fs->frame_ready) | ||
| 280 | break; | ||
| 281 | if ((ret = fs->on_event(fs)) < 0) | ||
| 282 | return ret; | ||
| 283 | ff_framesync_drop(fs); | ||
| 284 | count++; | ||
| 285 | if (!all) | ||
| 286 | break; | ||
| 287 | } | ||
| 288 | if (!count && fs->eof) | ||
| 289 | return AVERROR_EOF; | ||
| 290 | return count; | ||
| 291 | } | ||
| 292 | |||
| 293 | int ff_framesync_filter_frame(FFFrameSync *fs, AVFilterLink *inlink, | ||
| 294 | AVFrame *in) | ||
| 295 | { | ||
| 296 | int ret; | ||
| 297 | |||
| 298 | if ((ret = ff_framesync_process_frame(fs, 1)) < 0) | ||
| 299 | return ret; | ||
| 300 | if ((ret = ff_framesync_add_frame(fs, FF_INLINK_IDX(inlink), in)) < 0) | ||
| 301 | return ret; | ||
| 302 | if ((ret = ff_framesync_process_frame(fs, 0)) < 0) | ||
| 303 | return ret; | ||
| 304 | return 0; | ||
| 305 | } | ||
| 306 | |||
| 307 | int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink) | ||
| 308 | { | ||
| 309 | AVFilterContext *ctx = outlink->src; | ||
| 310 | int input, ret; | ||
| 311 | |||
| 312 | if ((ret = ff_framesync_process_frame(fs, 0)) < 0) | ||
| 313 | return ret; | ||
| 314 | if (ret > 0) | ||
| 315 | return 0; | ||
| 316 | if (fs->eof) | ||
| 317 | return AVERROR_EOF; | ||
| 318 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; | ||
| 319 | input = fs->in_request; | ||
| 320 | ret = ff_request_frame(ctx->inputs[input]); | ||
| 321 | if (ret == AVERROR_EOF) { | ||
| 322 | if ((ret = ff_framesync_add_frame(fs, input, NULL)) < 0) | ||
| 323 | return ret; | ||
| 324 | if ((ret = ff_framesync_process_frame(fs, 0)) < 0) | ||
| 325 | return ret; | ||
| 326 | ret = 0; | ||
| 327 | } | ||
| 328 | return ret; | ||
| 329 | } | ||
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| 1 | /* | ||
| 2 | * Copyright (c) 2013 Nicolas George | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public License | ||
| 8 | * as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 14 | * GNU Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public License | ||
| 17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., | ||
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #ifndef AVFILTER_FRAMESYNC_H | ||
| 22 | #define AVFILTER_FRAMESYNC_H | ||
| 23 | |||
| 24 | #include "bufferqueue.h" | ||
| 25 | |||
| 26 | /* | ||
| 27 | * TODO | ||
| 28 | * Callback-based API similar to dualinput. | ||
| 29 | * Export convenient options. | ||
| 30 | */ | ||
| 31 | |||
| 32 | /** | ||
| 33 | * This API is intended as a helper for filters that have several video | ||
| 34 | * input and need to combine them somehow. If the inputs have different or | ||
| 35 | * variable frame rate, getting the input frames to match requires a rather | ||
| 36 | * complex logic and a few user-tunable options. | ||
| 37 | * | ||
| 38 | * In this API, when a set of synchronized input frames is ready to be | ||
| 39 | * procesed is called a frame event. Frame event can be generated in | ||
| 40 | * response to input frames on any or all inputs and the handling of | ||
| 41 | * situations where some stream extend beyond the beginning or the end of | ||
| 42 | * others can be configured. | ||
| 43 | * | ||
| 44 | * The basic working of this API is the following: | ||
| 45 | * | ||
| 46 | * - When a frame is available on any input, add it using | ||
| 47 | * ff_framesync_add_frame(). | ||
| 48 | * | ||
| 49 | * - When a frame event is ready to be processed (i.e. after adding a frame | ||
| 50 | * or when requested on input): | ||
| 51 | * - call ff_framesync_next(); | ||
| 52 | * - if fs->frame_ready is true, process the frames; | ||
| 53 | * - call ff_framesync_drop(). | ||
| 54 | */ | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Stream extrapolation mode | ||
| 58 | * | ||
| 59 | * Describe how the frames of a stream are extrapolated before the first one | ||
| 60 | * and after EOF to keep sync with possibly longer other streams. | ||
| 61 | */ | ||
| 62 | enum FFFrameSyncExtMode { | ||
| 63 | |||
| 64 | /** | ||
| 65 | * Completely stop all streams with this one. | ||
| 66 | */ | ||
| 67 | EXT_STOP, | ||
| 68 | |||
| 69 | /** | ||
| 70 | * Ignore this stream and continue processing the other ones. | ||
| 71 | */ | ||
| 72 | EXT_NULL, | ||
| 73 | |||
| 74 | /** | ||
| 75 | * Extend the frame to infinity. | ||
| 76 | */ | ||
| 77 | EXT_INFINITY, | ||
| 78 | }; | ||
| 79 | |||
| 80 | /** | ||
| 81 | * Input stream structure | ||
| 82 | */ | ||
| 83 | typedef struct FFFrameSyncIn { | ||
| 84 | |||
| 85 | /** | ||
| 86 | * Queue of incoming AVFrame, and NULL to mark EOF | ||
| 87 | */ | ||
| 88 | struct FFBufQueue queue; | ||
| 89 | |||
| 90 | /** | ||
| 91 | * Extrapolation mode for timestamps before the first frame | ||
| 92 | */ | ||
| 93 | enum FFFrameSyncExtMode before; | ||
| 94 | |||
| 95 | /** | ||
| 96 | * Extrapolation mode for timestamps after the last frame | ||
| 97 | */ | ||
| 98 | enum FFFrameSyncExtMode after; | ||
| 99 | |||
| 100 | /** | ||
| 101 | * Time base for the incoming frames | ||
| 102 | */ | ||
| 103 | AVRational time_base; | ||
| 104 | |||
| 105 | /** | ||
| 106 | * Current frame, may be NULL before the first one or after EOF | ||
| 107 | */ | ||
| 108 | AVFrame *frame; | ||
| 109 | |||
| 110 | /** | ||
| 111 | * Next frame, for internal use | ||
| 112 | */ | ||
| 113 | AVFrame *frame_next; | ||
| 114 | |||
| 115 | /** | ||
| 116 | * PTS of the current frame | ||
| 117 | */ | ||
| 118 | int64_t pts; | ||
| 119 | |||
| 120 | /** | ||
| 121 | * PTS of the next frame, for internal use | ||
| 122 | */ | ||
| 123 | int64_t pts_next; | ||
| 124 | |||
| 125 | /** | ||
| 126 | * Boolean flagging the next frame, for internal use | ||
| 127 | */ | ||
| 128 | uint8_t have_next; | ||
| 129 | |||
| 130 | /** | ||
| 131 | * State: before first, in stream or after EOF, for internal use | ||
| 132 | */ | ||
| 133 | uint8_t state; | ||
| 134 | |||
| 135 | /** | ||
| 136 | * Synchronization level: frames on input at the highest sync level will | ||
| 137 | * generate output frame events. | ||
| 138 | * | ||
| 139 | * For example, if inputs #0 and #1 have sync level 2 and input #2 has | ||
| 140 | * sync level 1, then a frame on either input #0 or #1 will generate a | ||
| 141 | * frame event, but not a frame on input #2 until both inputs #0 and #1 | ||
| 142 | * have reached EOF. | ||
| 143 | * | ||
| 144 | * If sync is 0, no frame event will be generated. | ||
| 145 | */ | ||
| 146 | unsigned sync; | ||
| 147 | |||
| 148 | } FFFrameSyncIn; | ||
| 149 | |||
| 150 | /** | ||
| 151 | * Frame sync structure. | ||
| 152 | */ | ||
| 153 | typedef struct FFFrameSync { | ||
| 154 | const AVClass *class; | ||
| 155 | void *parent; | ||
| 156 | |||
| 157 | /** | ||
| 158 | * Number of input streams | ||
| 159 | */ | ||
| 160 | unsigned nb_in; | ||
| 161 | |||
| 162 | /** | ||
| 163 | * Time base for the output events | ||
| 164 | */ | ||
| 165 | AVRational time_base; | ||
| 166 | |||
| 167 | /** | ||
| 168 | * Timestamp of the current event | ||
| 169 | */ | ||
| 170 | int64_t pts; | ||
| 171 | |||
| 172 | /** | ||
| 173 | * Callback called when a frame event is ready | ||
| 174 | */ | ||
| 175 | int (*on_event)(struct FFFrameSync *fs); | ||
| 176 | |||
| 177 | /** | ||
| 178 | * Opaque pointer, not used by the API | ||
| 179 | */ | ||
| 180 | void *opaque; | ||
| 181 | |||
| 182 | /** | ||
| 183 | * Index of the input that requires a request | ||
| 184 | */ | ||
| 185 | unsigned in_request; | ||
| 186 | |||
| 187 | /** | ||
| 188 | * Synchronization level: only inputs with the same sync level are sync | ||
| 189 | * sources. | ||
| 190 | */ | ||
| 191 | unsigned sync_level; | ||
| 192 | |||
| 193 | /** | ||
| 194 | * Flag indicating that a frame event is ready | ||
| 195 | */ | ||
| 196 | uint8_t frame_ready; | ||
| 197 | |||
| 198 | /** | ||
| 199 | * Flag indicating that output has reached EOF. | ||
| 200 | */ | ||
| 201 | uint8_t eof; | ||
| 202 | |||
| 203 | /** | ||
| 204 | * Array of inputs; all inputs must be in consecutive memory | ||
| 205 | */ | ||
| 206 | FFFrameSyncIn in[1]; /* must be the last field */ | ||
| 207 | |||
| 208 | } FFFrameSync; | ||
| 209 | |||
| 210 | /** | ||
| 211 | * Initialize a frame sync structure. | ||
| 212 | * | ||
| 213 | * The entire structure is expected to be already set to 0. | ||
| 214 | * | ||
| 215 | * @param fs frame sync structure to initialize | ||
| 216 | * @param parent parent object, used for logging | ||
| 217 | * @param nb_in number of inputs | ||
| 218 | */ | ||
| 219 | void ff_framesync_init(FFFrameSync *fs, void *parent, unsigned nb_in); | ||
| 220 | |||
| 221 | /** | ||
| 222 | * Configure a frame sync structure. | ||
| 223 | * | ||
| 224 | * Must be called after all options are set but before all use. | ||
| 225 | * | ||
| 226 | * @return >= 0 for success or a negative error code | ||
| 227 | */ | ||
| 228 | int ff_framesync_configure(FFFrameSync *fs); | ||
| 229 | |||
| 230 | /** | ||
| 231 | * Free all memory currently allocated. | ||
| 232 | */ | ||
| 233 | void ff_framesync_uninit(FFFrameSync *fs); | ||
| 234 | |||
| 235 | /** | ||
| 236 | * Add a frame to an input | ||
| 237 | * | ||
| 238 | * Typically called from the filter_frame() method. | ||
| 239 | * | ||
| 240 | * @param fs frame sync structure | ||
| 241 | * @param in index of the input | ||
| 242 | * @param frame input frame, or NULL for EOF | ||
| 243 | */ | ||
| 244 | int ff_framesync_add_frame(FFFrameSync *fs, unsigned in, AVFrame *frame); | ||
| 245 | |||
| 246 | /** | ||
| 247 | * Prepare the next frame event. | ||
| 248 | * | ||
| 249 | * The status of the operation can be found in fs->frame_ready and fs->eof. | ||
| 250 | */ | ||
| 251 | void ff_framesync_next(FFFrameSync *fs); | ||
| 252 | |||
| 253 | /** | ||
| 254 | * Drop the current frame event. | ||
| 255 | */ | ||
| 256 | void ff_framesync_drop(FFFrameSync *fs); | ||
| 257 | |||
| 258 | /** | ||
| 259 | * Get the current frame in an input. | ||
| 260 | * | ||
| 261 | * @param fs frame sync structure | ||
| 262 | * @param in index of the input | ||
| 263 | * @param rframe used to return the current frame (or NULL) | ||
| 264 | * @param get if not zero, the calling code needs to get ownership of | ||
| 265 | * the returned frame; the current frame will either be | ||
| 266 | * duplicated or removed from the framesync structure | ||
| 267 | */ | ||
| 268 | int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe, | ||
| 269 | unsigned get); | ||
| 270 | |||
| 271 | /** | ||
| 272 | * Process one or several frame using the on_event callback. | ||
| 273 | * | ||
| 274 | * @return number of frames processed or negative error code | ||
| 275 | */ | ||
| 276 | int ff_framesync_process_frame(FFFrameSync *fs, unsigned all); | ||
| 277 | |||
| 278 | |||
| 279 | /** | ||
| 280 | * Accept a frame on a filter input. | ||
| 281 | * | ||
| 282 | * This function can be the complete implementation of all filter_frame | ||
| 283 | * methods of a filter using framesync. | ||
| 284 | */ | ||
| 285 | int ff_framesync_filter_frame(FFFrameSync *fs, AVFilterLink *inlink, | ||
| 286 | AVFrame *in); | ||
| 287 | |||
| 288 | /** | ||
| 289 | * Request a frame on the filter output. | ||
| 290 | * | ||
| 291 | * This function can be the complete implementation of all filter_frame | ||
| 292 | * methods of a filter using framesync if it has only one output. | ||
| 293 | */ | ||
| 294 | int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink); | ||
| 295 | |||
| 296 | #endif /* AVFILTER_FRAMESYNC_H */ | ||