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 */ | |