2 * avconv filter configuration
4 * This file is part of Libav.
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
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17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/buffersrc.h"
28 #include "libavresample/avresample.h"
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/display.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/pixdesc.h"
36 #include "libavutil/pixfmt.h"
37 #include "libavutil/samplefmt.h"
39 /* Define a function for building a string containing a list of
41 #define DEF_CHOOSE_FORMAT(suffix, type, var, supported_list, none, get_name) \
42 static char *choose_ ## suffix (OutputFilter *ofilter) \
44 if (ofilter->var != none) { \
45 get_name(ofilter->var); \
46 return av_strdup(name); \
47 } else if (ofilter->supported_list) { \
49 AVIOContext *s = NULL; \
53 if (avio_open_dyn_buf(&s) < 0) \
56 for (p = ofilter->supported_list; *p != none; p++) { \
58 avio_printf(s, "%s|", name); \
60 len = avio_close_dyn_buf(s, &ret); \
67 DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
70 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
71 AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
73 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
76 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
79 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
81 FilterGraph *fg = av_mallocz(sizeof(*fg));
85 fg->index = nb_filtergraphs;
87 GROW_ARRAY(fg->outputs, fg->nb_outputs);
88 if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
90 fg->outputs[0]->ost = ost;
91 fg->outputs[0]->graph = fg;
92 fg->outputs[0]->format = -1;
94 ost->filter = fg->outputs[0];
96 GROW_ARRAY(fg->inputs, fg->nb_inputs);
97 if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
99 fg->inputs[0]->ist = ist;
100 fg->inputs[0]->graph = fg;
101 fg->inputs[0]->format = -1;
103 fg->inputs[0]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
107 GROW_ARRAY(ist->filters, ist->nb_filters);
108 ist->filters[ist->nb_filters - 1] = fg->inputs[0];
110 GROW_ARRAY(filtergraphs, nb_filtergraphs);
111 filtergraphs[nb_filtergraphs - 1] = fg;
116 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
118 InputStream *ist = NULL;
119 enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
122 // TODO: support other filter types
123 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
124 av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
133 int file_idx = strtol(in->name, &p, 0);
135 if (file_idx < 0 || file_idx >= nb_input_files) {
136 av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
137 file_idx, fg->graph_desc);
140 s = input_files[file_idx]->ctx;
142 for (i = 0; i < s->nb_streams; i++) {
143 if (s->streams[i]->codecpar->codec_type != type)
145 if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
151 av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
152 "matches no streams.\n", p, fg->graph_desc);
155 ist = input_streams[input_files[file_idx]->ist_index + st->index];
157 /* find the first unused stream of corresponding type */
158 for (i = 0; i < nb_input_streams; i++) {
159 ist = input_streams[i];
160 if (ist->dec_ctx->codec_type == type && ist->discard)
163 if (i == nb_input_streams) {
164 av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
165 "unlabeled input pad %d on filter %s\n", in->pad_idx,
166 in->filter_ctx->name);
173 ist->decoding_needed = 1;
174 ist->st->discard = AVDISCARD_NONE;
176 GROW_ARRAY(fg->inputs, fg->nb_inputs);
177 if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
179 fg->inputs[fg->nb_inputs - 1]->ist = ist;
180 fg->inputs[fg->nb_inputs - 1]->graph = fg;
181 fg->inputs[fg->nb_inputs - 1]->format = -1;
183 fg->inputs[fg->nb_inputs - 1]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
184 if (!fg->inputs[fg->nb_inputs - 1]->frame_queue)
187 GROW_ARRAY(ist->filters, ist->nb_filters);
188 ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
191 int init_complex_filtergraph(FilterGraph *fg)
193 AVFilterInOut *inputs, *outputs, *cur;
194 AVFilterGraph *graph;
197 /* this graph is only used for determining the kinds of inputs
198 * and outputs we have, and is discarded on exit from this function */
199 graph = avfilter_graph_alloc();
201 return AVERROR(ENOMEM);
203 ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
207 for (cur = inputs; cur; cur = cur->next)
208 init_input_filter(fg, cur);
210 for (cur = outputs; cur;) {
211 GROW_ARRAY(fg->outputs, fg->nb_outputs);
212 fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
213 if (!fg->outputs[fg->nb_outputs - 1])
216 fg->outputs[fg->nb_outputs - 1]->graph = fg;
217 fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
218 fg->outputs[fg->nb_outputs - 1]->type = avfilter_pad_get_type(cur->filter_ctx->output_pads,
221 fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
225 avfilter_inout_free(&inputs);
226 avfilter_graph_free(&graph);
230 static int insert_trim(int64_t start_time, int64_t duration,
231 AVFilterContext **last_filter, int *pad_idx,
232 const char *filter_name)
234 AVFilterGraph *graph = (*last_filter)->graph;
235 AVFilterContext *ctx;
236 const AVFilter *trim;
237 enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
238 const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
241 if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
244 trim = avfilter_get_by_name(name);
246 av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
247 "recording time.\n", name);
248 return AVERROR_FILTER_NOT_FOUND;
251 ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
253 return AVERROR(ENOMEM);
255 if (duration != INT64_MAX) {
256 ret = av_opt_set_double(ctx, "duration", (double)duration / 1e6,
257 AV_OPT_SEARCH_CHILDREN);
259 if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
260 ret = av_opt_set_double(ctx, "start", (double)start_time / 1e6,
261 AV_OPT_SEARCH_CHILDREN);
264 av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
268 ret = avfilter_init_str(ctx, NULL);
272 ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
281 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
282 const char *filter_name, const char *args)
284 AVFilterGraph *graph = (*last_filter)->graph;
285 AVFilterContext *ctx;
288 ret = avfilter_graph_create_filter(&ctx,
289 avfilter_get_by_name(filter_name),
290 filter_name, args, NULL, graph);
294 ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
303 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
306 OutputStream *ost = ofilter->ost;
307 OutputFile *of = output_files[ost->file_index];
308 AVFilterContext *last_filter = out->filter_ctx;
309 int pad_idx = out->pad_idx;
313 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
314 ret = avfilter_graph_create_filter(&ofilter->filter,
315 avfilter_get_by_name("buffersink"),
316 name, NULL, NULL, fg->graph);
320 if (ofilter->width || ofilter->height) {
322 AVFilterContext *filter;
324 snprintf(args, sizeof(args), "%d:%d:0x%X",
325 ofilter->width, ofilter->height,
326 (unsigned)ost->sws_flags);
327 snprintf(name, sizeof(name), "scaler for output stream %d:%d",
328 ost->file_index, ost->index);
329 if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
330 name, args, NULL, fg->graph)) < 0)
332 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
335 last_filter = filter;
339 if ((pix_fmts = choose_pix_fmts(ofilter))) {
340 AVFilterContext *filter;
341 snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
342 ost->file_index, ost->index);
343 ret = avfilter_graph_create_filter(&filter,
344 avfilter_get_by_name("format"),
345 "format", pix_fmts, NULL, fg->graph);
349 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
352 last_filter = filter;
356 if (ost->frame_rate.num) {
357 AVFilterContext *fps;
360 snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
361 ost->frame_rate.den);
362 snprintf(name, sizeof(name), "fps for output stream %d:%d",
363 ost->file_index, ost->index);
364 ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
365 name, args, NULL, fg->graph);
369 ret = avfilter_link(last_filter, pad_idx, fps, 0);
376 snprintf(name, sizeof(name), "trim for output stream %d:%d",
377 ost->file_index, ost->index);
378 ret = insert_trim(of->start_time, of->recording_time,
379 &last_filter, &pad_idx, name);
384 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
390 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
392 OutputStream *ost = ofilter->ost;
393 OutputFile *of = output_files[ost->file_index];
394 AVCodecContext *codec = ost->enc_ctx;
395 AVFilterContext *last_filter = out->filter_ctx;
396 int pad_idx = out->pad_idx;
397 char *sample_fmts, *sample_rates, *channel_layouts;
402 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
403 ret = avfilter_graph_create_filter(&ofilter->filter,
404 avfilter_get_by_name("abuffersink"),
405 name, NULL, NULL, fg->graph);
409 if (codec->channels && !codec->channel_layout)
410 codec->channel_layout = av_get_default_channel_layout(codec->channels);
412 sample_fmts = choose_sample_fmts(ofilter);
413 sample_rates = choose_sample_rates(ofilter);
414 channel_layouts = choose_channel_layouts(ofilter);
415 if (sample_fmts || sample_rates || channel_layouts) {
416 AVFilterContext *format;
421 len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
424 len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
427 len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
431 av_freep(&sample_fmts);
432 av_freep(&sample_rates);
433 av_freep(&channel_layouts);
435 snprintf(name, sizeof(name), "audio format for output stream %d:%d",
436 ost->file_index, ost->index);
437 ret = avfilter_graph_create_filter(&format,
438 avfilter_get_by_name("aformat"),
439 name, args, NULL, fg->graph);
443 ret = avfilter_link(last_filter, pad_idx, format, 0);
447 last_filter = format;
451 snprintf(name, sizeof(name), "trim for output stream %d:%d",
452 ost->file_index, ost->index);
453 ret = insert_trim(of->start_time, of->recording_time,
454 &last_filter, &pad_idx, name);
458 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
464 #define DESCRIBE_FILTER_LINK(f, inout, in) \
466 AVFilterContext *ctx = inout->filter_ctx; \
467 AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
468 int nb_pads = in ? ctx->nb_inputs : ctx->nb_outputs; \
471 if (avio_open_dyn_buf(&pb) < 0) \
474 avio_printf(pb, "%s", ctx->filter->name); \
476 avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
478 avio_close_dyn_buf(pb, &f->name); \
481 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
483 av_freep(&ofilter->name);
484 DESCRIBE_FILTER_LINK(ofilter, out, 0);
486 switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
487 case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
488 case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
489 default: av_assert0(0);
493 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
496 AVFilterContext *last_filter;
497 const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
498 InputStream *ist = ifilter->ist;
499 InputFile *f = input_files[ist->file_index];
500 AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
502 AVBufferSrcParameters *par;
504 int ret, pad_idx = 0;
506 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
507 ist->file_index, ist->st->index);
509 ifilter->filter = avfilter_graph_alloc_filter(fg->graph, buffer_filt, name);
510 if (!ifilter->filter)
511 return AVERROR(ENOMEM);
513 par = av_buffersrc_parameters_alloc();
515 return AVERROR(ENOMEM);
517 par->sample_aspect_ratio = ifilter->sample_aspect_ratio;
518 par->width = ifilter->width;
519 par->height = ifilter->height;
520 par->format = ifilter->format;
522 if (ist->framerate.num)
523 par->frame_rate = ist->framerate;
524 par->hw_frames_ctx = ifilter->hw_frames_ctx;
526 ret = av_buffersrc_parameters_set(ifilter->filter, par);
531 ret = avfilter_init_str(ifilter->filter, NULL);
535 last_filter = ifilter->filter;
537 if (ist->autorotate) {
538 uint8_t* displaymatrix = av_stream_get_side_data(ist->st,
539 AV_PKT_DATA_DISPLAYMATRIX, NULL);
541 double rot = av_display_rotation_get((int32_t*) displaymatrix);
542 if (rot < -135 || rot > 135) {
543 ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
546 ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
547 } else if (rot < -45) {
548 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=clock");
549 } else if (rot > 45) {
550 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=cclock");
557 snprintf(name, sizeof(name), "trim for input stream %d:%d",
558 ist->file_index, ist->st->index);
559 ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
560 AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
564 if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
569 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
572 AVFilterContext *last_filter;
573 const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
574 InputStream *ist = ifilter->ist;
575 InputFile *f = input_files[ist->file_index];
576 AVBufferSrcParameters *par;
577 char args[255], name[255];
578 int ret, pad_idx = 0;
580 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
581 ist->file_index, ist->st->index);
583 ifilter->filter = avfilter_graph_alloc_filter(fg->graph, abuffer_filt, name);
584 if (!ifilter->filter)
585 return AVERROR(ENOMEM);
587 par = av_buffersrc_parameters_alloc();
589 return AVERROR(ENOMEM);
591 par->time_base = (AVRational){ 1, ifilter->sample_rate };
592 par->sample_rate = ifilter->sample_rate;
593 par->format = ifilter->format;
594 par->channel_layout = ifilter->channel_layout;
596 ret = av_buffersrc_parameters_set(ifilter->filter, par);
601 ret = avfilter_init_str(ifilter->filter, NULL);
604 last_filter = ifilter->filter;
606 if (audio_sync_method > 0) {
607 AVFilterContext *async;
610 av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
611 "asyncts audio filter instead.\n");
613 if (audio_sync_method > 1)
614 len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
615 "max_comp=%d:", audio_sync_method);
616 snprintf(args + len, sizeof(args) - len, "min_delta=%f",
617 audio_drift_threshold);
619 snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
620 fg->index, ist->file_index, ist->st->index);
621 ret = avfilter_graph_create_filter(&async,
622 avfilter_get_by_name("asyncts"),
623 name, args, NULL, fg->graph);
627 ret = avfilter_link(last_filter, 0, async, 0);
633 if (audio_volume != 256) {
634 AVFilterContext *volume;
636 av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
637 "audio filter instead.\n");
639 snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
641 snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
642 fg->index, ist->file_index, ist->st->index);
643 ret = avfilter_graph_create_filter(&volume,
644 avfilter_get_by_name("volume"),
645 name, args, NULL, fg->graph);
649 ret = avfilter_link(last_filter, 0, volume, 0);
653 last_filter = volume;
656 snprintf(name, sizeof(name), "trim for input stream %d:%d",
657 ist->file_index, ist->st->index);
658 ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
659 AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
663 if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
669 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
672 av_freep(&ifilter->name);
673 DESCRIBE_FILTER_LINK(ifilter, in, 1);
675 switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
676 case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
677 case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
678 default: av_assert0(0);
682 int configure_filtergraph(FilterGraph *fg)
684 AVFilterInOut *inputs, *outputs, *cur;
685 int ret, i, simple = filtergraph_is_simple(fg);
686 const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
689 avfilter_graph_free(&fg->graph);
690 if (!(fg->graph = avfilter_graph_alloc()))
691 return AVERROR(ENOMEM);
694 OutputStream *ost = fg->outputs[0]->ost;
696 AVDictionaryEntry *e = NULL;
698 snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
699 fg->graph->scale_sws_opts = av_strdup(args);
702 while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
703 AV_DICT_IGNORE_SUFFIX))) {
704 av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
707 args[strlen(args) - 1] = '\0';
708 fg->graph->resample_lavr_opts = av_strdup(args);
711 if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
715 for (i = 0; i < fg->graph->nb_filters; i++) {
716 fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
720 if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
721 av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
722 "exactly one input and output.\n", graph_desc);
723 ret = AVERROR(EINVAL);
727 for (cur = inputs, i = 0; cur; cur = cur->next, i++)
728 if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
730 avfilter_inout_free(&inputs);
732 for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
733 OutputFilter *ofilter = fg->outputs[i];
735 configure_output_filter(fg, ofilter, cur);
738 avfilter_inout_free(&outputs);
740 if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
743 /* limit the lists of allowed formats to the ones selected, to
744 * make sure they stay the same if the filtergraph is reconfigured later */
745 for (i = 0; i < fg->nb_outputs; i++) {
746 OutputFilter *ofilter = fg->outputs[i];
747 AVFilterLink *link = ofilter->filter->inputs[0];
749 ofilter->format = link->format;
751 ofilter->width = link->w;
752 ofilter->height = link->h;
754 ofilter->sample_rate = link->sample_rate;
755 ofilter->channel_layout = link->channel_layout;
758 for (i = 0; i < fg->nb_inputs; i++) {
759 while (av_fifo_size(fg->inputs[i]->frame_queue)) {
761 av_fifo_generic_read(fg->inputs[i]->frame_queue, &tmp, sizeof(tmp), NULL);
762 ret = av_buffersrc_add_frame(fg->inputs[i]->filter, tmp);
769 /* send the EOFs for the finished inputs */
770 for (i = 0; i < fg->nb_inputs; i++) {
771 if (fg->inputs[i]->eof) {
772 ret = av_buffersrc_add_frame(fg->inputs[i]->filter, NULL);
780 avfilter_graph_free(&fg->graph);
784 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
786 av_buffer_unref(&ifilter->hw_frames_ctx);
788 ifilter->format = frame->format;
790 ifilter->width = frame->width;
791 ifilter->height = frame->height;
792 ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
794 ifilter->sample_rate = frame->sample_rate;
795 ifilter->channel_layout = frame->channel_layout;
797 if (frame->hw_frames_ctx) {
798 ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
799 if (!ifilter->hw_frames_ctx)
800 return AVERROR(ENOMEM);
806 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
809 for (i = 0; i < fg->nb_inputs; i++)
810 if (fg->inputs[i]->ist == ist)
815 int filtergraph_is_simple(FilterGraph *fg)
817 return !fg->graph_desc;