2 * Copyright (c) 2016 Paul B Mahol
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "config_components.h"
23 #include "libavutil/audio_fifo.h"
24 #include "libavutil/internal.h"
25 #include "libavutil/opt.h"
32 typedef struct LoopContext {
42 int64_t current_sample;
44 int64_t ignored_samples;
56 #define AFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
57 #define VFLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
58 #define OFFSET(x) offsetof(LoopContext, x)
60 static void check_size(AVFilterContext *ctx)
62 LoopContext *s = ctx->priv;
65 av_log(ctx, AV_LOG_WARNING, "Number of %s to loop is not set!\n",
66 ctx->input_pads[0].type == AVMEDIA_TYPE_VIDEO ? "frames" : "samples");
69 static void update_time(AVFilterContext *ctx, AVRational tb)
71 LoopContext *s = ctx->priv;
73 if (s->time != INT64_MAX) {
74 int64_t time_pts = av_rescale_q(s->time, AV_TIME_BASE_Q, tb);
75 if (s->time_pts == AV_NOPTS_VALUE || time_pts < s->time_pts)
76 s->time_pts = time_pts;
80 #if CONFIG_ALOOP_FILTER
82 static int aconfig_input(AVFilterLink *inlink)
84 AVFilterContext *ctx = inlink->dst;
85 LoopContext *s = ctx->priv;
87 s->time_pts = AV_NOPTS_VALUE;
89 s->fifo = av_audio_fifo_alloc(inlink->format, inlink->ch_layout.nb_channels, 8192);
90 s->left = av_audio_fifo_alloc(inlink->format, inlink->ch_layout.nb_channels, 8192);
91 if (!s->fifo || !s->left)
92 return AVERROR(ENOMEM);
99 static av_cold void auninit(AVFilterContext *ctx)
101 LoopContext *s = ctx->priv;
103 av_audio_fifo_free(s->fifo);
104 av_audio_fifo_free(s->left);
107 static int push_samples(AVFilterContext *ctx, int nb_samples)
109 AVFilterLink *outlink = ctx->outputs[0];
110 LoopContext *s = ctx->priv;
114 while (s->loop != 0 && i < nb_samples) {
115 out = ff_get_audio_buffer(outlink, FFMIN(nb_samples, s->nb_samples - s->current_sample));
117 return AVERROR(ENOMEM);
118 ret = av_audio_fifo_peek_at(s->fifo, (void **)out->extended_data, out->nb_samples, s->current_sample);
124 out->nb_samples = ret;
125 s->pts += av_rescale_q(out->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
126 i += out->nb_samples;
127 s->current_sample += out->nb_samples;
129 ret = ff_filter_frame(outlink, out);
133 if (s->current_sample >= s->nb_samples) {
134 s->current_sample = 0;
144 static int afilter_frame(AVFilterLink *inlink, AVFrame *frame)
146 AVFilterContext *ctx = inlink->dst;
147 AVFilterLink *outlink = ctx->outputs[0];
148 LoopContext *s = ctx->priv;
151 if (((s->start >= 0 && s->ignored_samples + frame->nb_samples > s->start) ||
152 (s->time_pts != AV_NOPTS_VALUE &&
153 frame->pts >= s->time_pts)) &&
154 s->size > 0 && s->loop != 0) {
155 if (s->nb_samples < s->size) {
156 int written = FFMIN(frame->nb_samples, s->size - s->nb_samples);
160 s->start = inlink->sample_count_out - written;
162 ret = av_audio_fifo_write(s->fifo, (void **)frame->extended_data, written);
165 if (!s->nb_samples) {
166 drain = FFMAX(0, s->start - s->ignored_samples);
168 av_audio_fifo_drain(s->fifo, drain);
169 s->pts += av_rescale_q(s->start - s->ignored_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
171 s->nb_samples += ret - drain;
172 drain = frame->nb_samples - written;
173 if (s->nb_samples == s->size && drain > 0) {
176 ret2 = av_audio_fifo_write(s->left, (void **)frame->extended_data, frame->nb_samples);
179 av_audio_fifo_drain(s->left, drain);
181 frame->nb_samples = ret;
182 s->pts += av_rescale_q(ret, (AVRational){1, outlink->sample_rate}, outlink->time_base);
183 ret = ff_filter_frame(outlink, frame);
185 int nb_samples = frame->nb_samples;
187 av_frame_free(&frame);
188 ret = push_samples(ctx, nb_samples);
191 s->ignored_samples += frame->nb_samples;
193 s->pts += av_rescale_q(frame->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
194 ret = ff_filter_frame(outlink, frame);
200 static int arequest_frame(AVFilterLink *outlink)
202 AVFilterContext *ctx = outlink->src;
203 LoopContext *s = ctx->priv;
207 (s->nb_samples < s->size) ||
208 (s->nb_samples >= s->size && s->loop == 0)) {
209 int nb_samples = av_audio_fifo_size(s->left);
211 if (s->loop == 0 && nb_samples > 0) {
214 out = ff_get_audio_buffer(outlink, nb_samples);
216 return AVERROR(ENOMEM);
217 av_audio_fifo_read(s->left, (void **)out->extended_data, nb_samples);
219 s->pts += av_rescale_q(nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
220 ret = ff_filter_frame(outlink, out);
224 ret = ff_request_frame(ctx->inputs[0]);
226 ret = push_samples(ctx, 1024);
229 if (s->eof && s->nb_samples > 0 && s->loop != 0) {
230 ret = push_samples(ctx, 1024);
236 static int aactivate(AVFilterContext *ctx)
238 AVFilterLink *inlink = ctx->inputs[0];
239 AVFilterLink *outlink = ctx->outputs[0];
240 LoopContext *s = ctx->priv;
241 AVFrame *frame = NULL;
244 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
246 update_time(ctx, inlink->time_base);
248 if (!s->eof && (s->nb_samples < s->size || !s->loop || !s->size)) {
249 const int in_nb_samples = FFMIN(1024, s->size - s->nb_samples);
250 if (in_nb_samples == 0)
251 ret = ff_inlink_consume_frame(inlink, &frame);
253 ret = ff_inlink_consume_samples(inlink, in_nb_samples, in_nb_samples, &frame);
257 return afilter_frame(inlink, frame);
260 if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &s->eof_pts)) {
261 if (status == AVERROR_EOF) {
262 s->size = s->nb_samples;
267 if (s->eof && (!s->loop || !s->size)) {
268 ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts + s->pts_offset);
272 if (!s->eof && (!s->size ||
273 (s->nb_samples < s->size) ||
274 (s->nb_samples >= s->size && s->loop == 0))) {
275 FF_FILTER_FORWARD_WANTED(outlink, inlink);
276 } else if (s->loop && s->nb_samples == s->size) {
277 return arequest_frame(outlink);
280 return FFERROR_NOT_READY;
283 static const AVOption aloop_options[] = {
284 { "loop", "number of loops", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, INT_MAX, AFLAGS },
285 { "size", "max number of samples to loop", OFFSET(size), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT32_MAX, AFLAGS },
286 { "start", "set the loop start sample", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0 }, -1, INT64_MAX, AFLAGS },
287 { "time", "set the loop start time", OFFSET(time), AV_OPT_TYPE_DURATION, {.i64=INT64_MAX}, INT64_MIN, INT64_MAX, AFLAGS },
291 AVFILTER_DEFINE_CLASS(aloop);
293 static const AVFilterPad ainputs[] = {
296 .type = AVMEDIA_TYPE_AUDIO,
297 .config_props = aconfig_input,
301 const AVFilter ff_af_aloop = {
303 .description = NULL_IF_CONFIG_SMALL("Loop audio samples."),
304 .priv_size = sizeof(LoopContext),
305 .priv_class = &aloop_class,
306 .activate = aactivate,
308 FILTER_INPUTS(ainputs),
309 FILTER_OUTPUTS(ff_audio_default_filterpad),
311 #endif /* CONFIG_ALOOP_FILTER */
313 #if CONFIG_LOOP_FILTER
315 static av_cold int init(AVFilterContext *ctx)
317 LoopContext *s = ctx->priv;
319 s->time_pts = AV_NOPTS_VALUE;
321 s->frames = av_calloc(s->size, sizeof(*s->frames));
323 return AVERROR(ENOMEM);
330 static void free_frames(AVFilterContext *ctx)
332 LoopContext *s = ctx->priv;
334 for (int i = 0; i < s->nb_frames; i++)
335 av_frame_free(&s->frames[i]);
338 static av_cold void uninit(AVFilterContext *ctx)
340 LoopContext *s = ctx->priv;
343 av_freep(&s->frames);
347 static int push_frame(AVFilterContext *ctx)
349 AVFilterLink *outlink = ctx->outputs[0];
350 LoopContext *s = ctx->priv;
354 out = av_frame_clone(s->frames[s->current_frame]);
356 return AVERROR(ENOMEM);
357 out->pts += s->pts_offset;
358 ret = ff_filter_frame(outlink, out);
361 if (s->current_frame >= s->nb_frames) {
362 s->current_frame = 0;
364 s->pts_offset += s->duration;
374 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
376 AVFilterContext *ctx = inlink->dst;
377 AVFilterLink *outlink = ctx->outputs[0];
378 LoopContext *s = ctx->priv;
382 if (((s->start >= 0 && inlink->frame_count_out >= s->start) ||
383 (s->time_pts != AV_NOPTS_VALUE &&
384 frame->pts >= s->time_pts)) &&
385 s->size > 0 && s->loop != 0) {
386 if (s->nb_frames < s->size) {
387 s->frames[s->nb_frames] = av_frame_clone(frame);
388 if (!s->frames[s->nb_frames]) {
389 av_frame_free(&frame);
390 return AVERROR(ENOMEM);
394 duration = frame->duration;
396 duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
397 s->duration += duration;
398 s->pts_offset = s->duration;
399 ret = ff_filter_frame(outlink, frame);
401 av_frame_free(&frame);
402 ret = push_frame(ctx);
405 frame->pts += s->pts_offset - s->duration;
406 ret = ff_filter_frame(outlink, frame);
412 static int activate(AVFilterContext *ctx)
414 AVFilterLink *inlink = ctx->inputs[0];
415 AVFilterLink *outlink = ctx->outputs[0];
416 LoopContext *s = ctx->priv;
417 AVFrame *frame = NULL;
420 ret = ff_outlink_get_status(outlink);
422 ff_inlink_set_status(inlink, ret);
427 update_time(ctx, inlink->time_base);
429 if (!s->eof && (s->nb_frames < s->size || !s->loop || !s->size)) {
430 ret = ff_inlink_consume_frame(inlink, &frame);
434 return filter_frame(inlink, frame);
437 if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &s->eof_pts)) {
438 if (status == AVERROR_EOF) {
439 s->size = s->nb_frames;
444 if (s->eof && (!s->loop || !s->size)) {
445 ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts + s->pts_offset);
450 if (!s->eof && (!s->size ||
451 (s->nb_frames < s->size) ||
452 (s->nb_frames >= s->size && s->loop == 0))) {
453 FF_FILTER_FORWARD_WANTED(outlink, inlink);
454 } else if (s->loop && s->nb_frames == s->size) {
455 return push_frame(ctx);
458 return FFERROR_NOT_READY;
461 static const AVOption loop_options[] = {
462 { "loop", "number of loops", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, INT_MAX, VFLAGS },
463 { "size", "max number of frames to loop", OFFSET(size), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT16_MAX, VFLAGS },
464 { "start", "set the loop start frame", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0 }, -1, INT64_MAX, VFLAGS },
465 { "time", "set the loop start time", OFFSET(time), AV_OPT_TYPE_DURATION, {.i64=INT64_MAX}, INT64_MIN, INT64_MAX, VFLAGS },
469 AVFILTER_DEFINE_CLASS(loop);
471 const AVFilter ff_vf_loop = {
473 .description = NULL_IF_CONFIG_SMALL("Loop video frames."),
474 .priv_size = sizeof(LoopContext),
475 .priv_class = &loop_class,
478 .activate = activate,
479 FILTER_INPUTS(ff_video_default_filterpad),
480 FILTER_OUTPUTS(ff_video_default_filterpad),
482 #endif /* CONFIG_LOOP_FILTER */