lavc/dpx: Support GRAY12 colourspace.
[ffmpeg.git] / ffmpeg_filter.c
1 /*
2  * ffmpeg filter configuration
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
8  * License 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 GNU
14  * Lesser General Public License for more details.
15  *
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
19  */
20
21 #include <stdint.h>
22
23 #include "ffmpeg.h"
24
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/buffersink.h"
27 #include "libavfilter/buffersrc.h"
28
29 #include "libavresample/avresample.h"
30
31 #include "libavutil/avassert.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/bprint.h"
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/display.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/pixdesc.h"
38 #include "libavutil/pixfmt.h"
39 #include "libavutil/imgutils.h"
40 #include "libavutil/samplefmt.h"
41
42 int filter_nbthreads = -1;
43 int filter_complex_nbthreads = -1;
44
45 static const enum AVPixelFormat *get_compliance_unofficial_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
46 {
47     static const enum AVPixelFormat mjpeg_formats[] =
48         { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
49           AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
50           AV_PIX_FMT_NONE };
51     static const enum AVPixelFormat ljpeg_formats[] =
52         { AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
53           AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
54           AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
55           AV_PIX_FMT_NONE};
56
57     if (codec_id == AV_CODEC_ID_MJPEG) {
58         return mjpeg_formats;
59     } else if (codec_id == AV_CODEC_ID_LJPEG) {
60         return ljpeg_formats;
61     } else {
62         return default_formats;
63     }
64 }
65
66 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
67 {
68     if (codec && codec->pix_fmts) {
69         const enum AVPixelFormat *p = codec->pix_fmts;
70         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
71         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
72         enum AVPixelFormat best= AV_PIX_FMT_NONE;
73
74         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
75             p = get_compliance_unofficial_pix_fmts(enc_ctx->codec_id, p);
76         }
77         for (; *p != AV_PIX_FMT_NONE; p++) {
78             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
79             if (*p == target)
80                 break;
81         }
82         if (*p == AV_PIX_FMT_NONE) {
83             if (target != AV_PIX_FMT_NONE)
84                 av_log(NULL, AV_LOG_WARNING,
85                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
86                        av_get_pix_fmt_name(target),
87                        codec->name,
88                        av_get_pix_fmt_name(best));
89             return best;
90         }
91     }
92     return target;
93 }
94
95 void choose_sample_fmt(AVStream *st, AVCodec *codec)
96 {
97     if (codec && codec->sample_fmts) {
98         const enum AVSampleFormat *p = codec->sample_fmts;
99         for (; *p != -1; p++) {
100             if (*p == st->codecpar->format)
101                 break;
102         }
103         if (*p == -1) {
104             if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codecpar->format) > av_get_sample_fmt_name(codec->sample_fmts[0]))
105                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
106             if(av_get_sample_fmt_name(st->codecpar->format))
107             av_log(NULL, AV_LOG_WARNING,
108                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
109                    av_get_sample_fmt_name(st->codecpar->format),
110                    codec->name,
111                    av_get_sample_fmt_name(codec->sample_fmts[0]));
112             st->codecpar->format = codec->sample_fmts[0];
113         }
114     }
115 }
116
117 static char *choose_pix_fmts(OutputFilter *ofilter)
118 {
119     OutputStream *ost = ofilter->ost;
120     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
121     if (strict_dict)
122         // used by choose_pixel_fmt() and below
123         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
124
125      if (ost->keep_pix_fmt) {
126         avfilter_graph_set_auto_convert(ofilter->graph->graph,
127                                             AVFILTER_AUTO_CONVERT_NONE);
128         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
129             return NULL;
130         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
131     }
132     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
133         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
134     } else if (ost->enc && ost->enc->pix_fmts) {
135         const enum AVPixelFormat *p;
136         AVIOContext *s = NULL;
137         uint8_t *ret;
138         int len;
139
140         if (avio_open_dyn_buf(&s) < 0)
141             exit_program(1);
142
143         p = ost->enc->pix_fmts;
144         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
145             p = get_compliance_unofficial_pix_fmts(ost->enc_ctx->codec_id, p);
146         }
147
148         for (; *p != AV_PIX_FMT_NONE; p++) {
149             const char *name = av_get_pix_fmt_name(*p);
150             avio_printf(s, "%s|", name);
151         }
152         len = avio_close_dyn_buf(s, &ret);
153         ret[len - 1] = 0;
154         return ret;
155     } else
156         return NULL;
157 }
158
159 /* Define a function for building a string containing a list of
160  * allowed formats. */
161 #define DEF_CHOOSE_FORMAT(suffix, type, var, supported_list, none, get_name)   \
162 static char *choose_ ## suffix (OutputFilter *ofilter)                         \
163 {                                                                              \
164     if (ofilter->var != none) {                                                \
165         get_name(ofilter->var);                                                \
166         return av_strdup(name);                                                \
167     } else if (ofilter->supported_list) {                                      \
168         const type *p;                                                         \
169         AVIOContext *s = NULL;                                                 \
170         uint8_t *ret;                                                          \
171         int len;                                                               \
172                                                                                \
173         if (avio_open_dyn_buf(&s) < 0)                                         \
174             exit_program(1);                                                           \
175                                                                                \
176         for (p = ofilter->supported_list; *p != none; p++) {                   \
177             get_name(*p);                                                      \
178             avio_printf(s, "%s|", name);                                       \
179         }                                                                      \
180         len = avio_close_dyn_buf(s, &ret);                                     \
181         ret[len - 1] = 0;                                                      \
182         return ret;                                                            \
183     } else                                                                     \
184         return NULL;                                                           \
185 }
186
187 //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
188 //                  GET_PIX_FMT_NAME)
189
190 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
191                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
192
193 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
194                   GET_SAMPLE_RATE_NAME)
195
196 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
197                   GET_CH_LAYOUT_NAME)
198
199 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
200 {
201     FilterGraph *fg = av_mallocz(sizeof(*fg));
202
203     if (!fg)
204         exit_program(1);
205     fg->index = nb_filtergraphs;
206
207     GROW_ARRAY(fg->outputs, fg->nb_outputs);
208     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
209         exit_program(1);
210     fg->outputs[0]->ost   = ost;
211     fg->outputs[0]->graph = fg;
212     fg->outputs[0]->format = -1;
213
214     ost->filter = fg->outputs[0];
215
216     GROW_ARRAY(fg->inputs, fg->nb_inputs);
217     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
218         exit_program(1);
219     fg->inputs[0]->ist   = ist;
220     fg->inputs[0]->graph = fg;
221     fg->inputs[0]->format = -1;
222
223     GROW_ARRAY(ist->filters, ist->nb_filters);
224     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
225
226     GROW_ARRAY(filtergraphs, nb_filtergraphs);
227     filtergraphs[nb_filtergraphs - 1] = fg;
228
229     return 0;
230 }
231
232 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
233 {
234     InputStream *ist = NULL;
235     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
236     int i;
237
238     // TODO: support other filter types
239     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
240         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
241                "currently.\n");
242         exit_program(1);
243     }
244
245     if (in->name) {
246         AVFormatContext *s;
247         AVStream       *st = NULL;
248         char *p;
249         int file_idx = strtol(in->name, &p, 0);
250
251         if (file_idx < 0 || file_idx >= nb_input_files) {
252             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
253                    file_idx, fg->graph_desc);
254             exit_program(1);
255         }
256         s = input_files[file_idx]->ctx;
257
258         for (i = 0; i < s->nb_streams; i++) {
259             enum AVMediaType stream_type = s->streams[i]->codecpar->codec_type;
260             if (stream_type != type &&
261                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
262                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
263                 continue;
264             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
265                 st = s->streams[i];
266                 break;
267             }
268         }
269         if (!st) {
270             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
271                    "matches no streams.\n", p, fg->graph_desc);
272             exit_program(1);
273         }
274         ist = input_streams[input_files[file_idx]->ist_index + st->index];
275     } else {
276         /* find the first unused stream of corresponding type */
277         for (i = 0; i < nb_input_streams; i++) {
278             ist = input_streams[i];
279             if (ist->dec_ctx->codec_type == type && ist->discard)
280                 break;
281         }
282         if (i == nb_input_streams) {
283             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
284                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
285                    in->filter_ctx->name);
286             exit_program(1);
287         }
288     }
289     av_assert0(ist);
290
291     ist->discard         = 0;
292     ist->decoding_needed |= DECODING_FOR_FILTER;
293     ist->st->discard = AVDISCARD_NONE;
294
295     GROW_ARRAY(fg->inputs, fg->nb_inputs);
296     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
297         exit_program(1);
298     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
299     fg->inputs[fg->nb_inputs - 1]->graph = fg;
300     fg->inputs[fg->nb_inputs - 1]->format = -1;
301
302     GROW_ARRAY(ist->filters, ist->nb_filters);
303     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
304 }
305
306 int init_complex_filtergraph(FilterGraph *fg)
307 {
308     AVFilterInOut *inputs, *outputs, *cur;
309     AVFilterGraph *graph;
310     int ret = 0;
311
312     /* this graph is only used for determining the kinds of inputs
313      * and outputs we have, and is discarded on exit from this function */
314     graph = avfilter_graph_alloc();
315     if (!graph)
316         return AVERROR(ENOMEM);
317
318     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
319     if (ret < 0)
320         goto fail;
321
322     for (cur = inputs; cur; cur = cur->next)
323         init_input_filter(fg, cur);
324
325     for (cur = outputs; cur;) {
326         GROW_ARRAY(fg->outputs, fg->nb_outputs);
327         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
328         if (!fg->outputs[fg->nb_outputs - 1])
329             exit_program(1);
330
331         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
332         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
333         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
334                                                                          cur->pad_idx);
335         cur = cur->next;
336         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
337     }
338
339 fail:
340     avfilter_inout_free(&inputs);
341     avfilter_graph_free(&graph);
342     return ret;
343 }
344
345 static int insert_trim(int64_t start_time, int64_t duration,
346                        AVFilterContext **last_filter, int *pad_idx,
347                        const char *filter_name)
348 {
349     AVFilterGraph *graph = (*last_filter)->graph;
350     AVFilterContext *ctx;
351     const AVFilter *trim;
352     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
353     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
354     int ret = 0;
355
356     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
357         return 0;
358
359     trim = avfilter_get_by_name(name);
360     if (!trim) {
361         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
362                "recording time.\n", name);
363         return AVERROR_FILTER_NOT_FOUND;
364     }
365
366     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
367     if (!ctx)
368         return AVERROR(ENOMEM);
369
370     if (duration != INT64_MAX) {
371         ret = av_opt_set_int(ctx, "durationi", duration,
372                                 AV_OPT_SEARCH_CHILDREN);
373     }
374     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
375         ret = av_opt_set_int(ctx, "starti", start_time,
376                                 AV_OPT_SEARCH_CHILDREN);
377     }
378     if (ret < 0) {
379         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
380         return ret;
381     }
382
383     ret = avfilter_init_str(ctx, NULL);
384     if (ret < 0)
385         return ret;
386
387     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
388     if (ret < 0)
389         return ret;
390
391     *last_filter = ctx;
392     *pad_idx     = 0;
393     return 0;
394 }
395
396 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
397                          const char *filter_name, const char *args)
398 {
399     AVFilterGraph *graph = (*last_filter)->graph;
400     AVFilterContext *ctx;
401     int ret;
402
403     ret = avfilter_graph_create_filter(&ctx,
404                                        avfilter_get_by_name(filter_name),
405                                        filter_name, args, NULL, graph);
406     if (ret < 0)
407         return ret;
408
409     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
410     if (ret < 0)
411         return ret;
412
413     *last_filter = ctx;
414     *pad_idx     = 0;
415     return 0;
416 }
417
418 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
419 {
420     char *pix_fmts;
421     OutputStream *ost = ofilter->ost;
422     OutputFile    *of = output_files[ost->file_index];
423     AVFilterContext *last_filter = out->filter_ctx;
424     int pad_idx = out->pad_idx;
425     int ret;
426     char name[255];
427
428     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
429     ret = avfilter_graph_create_filter(&ofilter->filter,
430                                        avfilter_get_by_name("buffersink"),
431                                        name, NULL, NULL, fg->graph);
432
433     if (ret < 0)
434         return ret;
435
436     if (!hw_device_ctx && (ofilter->width || ofilter->height)) {
437         char args[255];
438         AVFilterContext *filter;
439         AVDictionaryEntry *e = NULL;
440
441         snprintf(args, sizeof(args), "%d:%d",
442                  ofilter->width, ofilter->height);
443
444         while ((e = av_dict_get(ost->sws_dict, "", e,
445                                 AV_DICT_IGNORE_SUFFIX))) {
446             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
447         }
448
449         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
450                  ost->file_index, ost->index);
451         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
452                                                 name, args, NULL, fg->graph)) < 0)
453             return ret;
454         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
455             return ret;
456
457         last_filter = filter;
458         pad_idx = 0;
459     }
460
461     if ((pix_fmts = choose_pix_fmts(ofilter))) {
462         AVFilterContext *filter;
463         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
464                  ost->file_index, ost->index);
465         ret = avfilter_graph_create_filter(&filter,
466                                            avfilter_get_by_name("format"),
467                                            "format", pix_fmts, NULL, fg->graph);
468         av_freep(&pix_fmts);
469         if (ret < 0)
470             return ret;
471         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
472             return ret;
473
474         last_filter = filter;
475         pad_idx     = 0;
476     }
477
478     if (ost->frame_rate.num && 0) {
479         AVFilterContext *fps;
480         char args[255];
481
482         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
483                  ost->frame_rate.den);
484         snprintf(name, sizeof(name), "fps for output stream %d:%d",
485                  ost->file_index, ost->index);
486         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
487                                            name, args, NULL, fg->graph);
488         if (ret < 0)
489             return ret;
490
491         ret = avfilter_link(last_filter, pad_idx, fps, 0);
492         if (ret < 0)
493             return ret;
494         last_filter = fps;
495         pad_idx = 0;
496     }
497
498     snprintf(name, sizeof(name), "trim for output stream %d:%d",
499              ost->file_index, ost->index);
500     ret = insert_trim(of->start_time, of->recording_time,
501                       &last_filter, &pad_idx, name);
502     if (ret < 0)
503         return ret;
504
505
506     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
507         return ret;
508
509     return 0;
510 }
511
512 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
513 {
514     OutputStream *ost = ofilter->ost;
515     OutputFile    *of = output_files[ost->file_index];
516     AVCodecContext *codec  = ost->enc_ctx;
517     AVFilterContext *last_filter = out->filter_ctx;
518     int pad_idx = out->pad_idx;
519     char *sample_fmts, *sample_rates, *channel_layouts;
520     char name[255];
521     int ret;
522
523     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
524     ret = avfilter_graph_create_filter(&ofilter->filter,
525                                        avfilter_get_by_name("abuffersink"),
526                                        name, NULL, NULL, fg->graph);
527     if (ret < 0)
528         return ret;
529     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
530         return ret;
531
532 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
533     AVFilterContext *filt_ctx;                                              \
534                                                                             \
535     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
536            "similarly to -af " filter_name "=%s.\n", arg);                  \
537                                                                             \
538     ret = avfilter_graph_create_filter(&filt_ctx,                           \
539                                        avfilter_get_by_name(filter_name),   \
540                                        filter_name, arg, NULL, fg->graph);  \
541     if (ret < 0)                                                            \
542         return ret;                                                         \
543                                                                             \
544     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
545     if (ret < 0)                                                            \
546         return ret;                                                         \
547                                                                             \
548     last_filter = filt_ctx;                                                 \
549     pad_idx = 0;                                                            \
550 } while (0)
551     if (ost->audio_channels_mapped) {
552         int i;
553         AVBPrint pan_buf;
554         av_bprint_init(&pan_buf, 256, 8192);
555         av_bprintf(&pan_buf, "0x%"PRIx64,
556                    av_get_default_channel_layout(ost->audio_channels_mapped));
557         for (i = 0; i < ost->audio_channels_mapped; i++)
558             if (ost->audio_channels_map[i] != -1)
559                 av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
560
561         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
562         av_bprint_finalize(&pan_buf, NULL);
563     }
564
565     if (codec->channels && !codec->channel_layout)
566         codec->channel_layout = av_get_default_channel_layout(codec->channels);
567
568     sample_fmts     = choose_sample_fmts(ofilter);
569     sample_rates    = choose_sample_rates(ofilter);
570     channel_layouts = choose_channel_layouts(ofilter);
571     if (sample_fmts || sample_rates || channel_layouts) {
572         AVFilterContext *format;
573         char args[256];
574         args[0] = 0;
575
576         if (sample_fmts)
577             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
578                             sample_fmts);
579         if (sample_rates)
580             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
581                             sample_rates);
582         if (channel_layouts)
583             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
584                             channel_layouts);
585
586         av_freep(&sample_fmts);
587         av_freep(&sample_rates);
588         av_freep(&channel_layouts);
589
590         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
591                  ost->file_index, ost->index);
592         ret = avfilter_graph_create_filter(&format,
593                                            avfilter_get_by_name("aformat"),
594                                            name, args, NULL, fg->graph);
595         if (ret < 0)
596             return ret;
597
598         ret = avfilter_link(last_filter, pad_idx, format, 0);
599         if (ret < 0)
600             return ret;
601
602         last_filter = format;
603         pad_idx = 0;
604     }
605
606     if (audio_volume != 256 && 0) {
607         char args[256];
608
609         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
610         AUTO_INSERT_FILTER("-vol", "volume", args);
611     }
612
613     if (ost->apad && of->shortest) {
614         char args[256];
615         int i;
616
617         for (i=0; i<of->ctx->nb_streams; i++)
618             if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
619                 break;
620
621         if (i<of->ctx->nb_streams) {
622             snprintf(args, sizeof(args), "%s", ost->apad);
623             AUTO_INSERT_FILTER("-apad", "apad", args);
624         }
625     }
626
627     snprintf(name, sizeof(name), "trim for output stream %d:%d",
628              ost->file_index, ost->index);
629     ret = insert_trim(of->start_time, of->recording_time,
630                       &last_filter, &pad_idx, name);
631     if (ret < 0)
632         return ret;
633
634     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
635         return ret;
636
637     return 0;
638 }
639
640 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
641 {                                                                  \
642     AVFilterContext *ctx = inout->filter_ctx;                      \
643     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
644     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
645     AVIOContext *pb;                                               \
646                                                                    \
647     if (avio_open_dyn_buf(&pb) < 0)                                \
648         exit_program(1);                                           \
649                                                                    \
650     avio_printf(pb, "%s", ctx->filter->name);                      \
651     if (nb_pads > 1)                                               \
652         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
653     avio_w8(pb, 0);                                                \
654     avio_close_dyn_buf(pb, &f->name);                              \
655 }
656
657 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
658 {
659     av_freep(&ofilter->name);
660     DESCRIBE_FILTER_LINK(ofilter, out, 0);
661
662     if (!ofilter->ost) {
663         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
664         exit_program(1);
665     }
666
667     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
668     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
669     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
670     default: av_assert0(0);
671     }
672 }
673
674 static int sub2video_prepare(InputStream *ist, InputFilter *ifilter)
675 {
676     AVFormatContext *avf = input_files[ist->file_index]->ctx;
677     int i, w, h;
678
679     /* Compute the size of the canvas for the subtitles stream.
680        If the subtitles codecpar has set a size, use it. Otherwise use the
681        maximum dimensions of the video streams in the same file. */
682     w = ifilter->width;
683     h = ifilter->height;
684     if (!(w && h)) {
685         for (i = 0; i < avf->nb_streams; i++) {
686             if (avf->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
687                 w = FFMAX(w, avf->streams[i]->codecpar->width);
688                 h = FFMAX(h, avf->streams[i]->codecpar->height);
689             }
690         }
691         if (!(w && h)) {
692             w = FFMAX(w, 720);
693             h = FFMAX(h, 576);
694         }
695         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
696     }
697     ist->sub2video.w = ist->resample_width  = ifilter->width  = w;
698     ist->sub2video.h = ist->resample_height = ifilter->height = h;
699
700     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
701        palettes for all rectangles are identical or compatible */
702     ist->resample_pix_fmt = ifilter->format = AV_PIX_FMT_RGB32;
703
704     ist->sub2video.frame = av_frame_alloc();
705     if (!ist->sub2video.frame)
706         return AVERROR(ENOMEM);
707     ist->sub2video.last_pts = INT64_MIN;
708     return 0;
709 }
710
711 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
712                                         AVFilterInOut *in)
713 {
714     AVFilterContext *last_filter;
715     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
716     InputStream *ist = ifilter->ist;
717     InputFile     *f = input_files[ist->file_index];
718     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
719                                          ist->st->time_base;
720     AVRational fr = ist->framerate;
721     AVRational sar;
722     AVBPrint args;
723     char name[255];
724     int ret, pad_idx = 0;
725     int64_t tsoffset = 0;
726     AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
727
728     if (!par)
729         return AVERROR(ENOMEM);
730     memset(par, 0, sizeof(*par));
731     par->format = AV_PIX_FMT_NONE;
732
733     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
734         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
735         ret = AVERROR(EINVAL);
736         goto fail;
737     }
738
739     if (!fr.num)
740         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
741
742     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
743         ret = sub2video_prepare(ist, ifilter);
744         if (ret < 0)
745             goto fail;
746     }
747
748     sar = ifilter->sample_aspect_ratio;
749     if(!sar.den)
750         sar = (AVRational){0,1};
751     av_bprint_init(&args, 0, 1);
752     av_bprintf(&args,
753              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
754              "pixel_aspect=%d/%d:sws_param=flags=%d",
755              ifilter->width, ifilter->height, ifilter->format,
756              tb.num, tb.den, sar.num, sar.den,
757              SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
758     if (fr.num && fr.den)
759         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
760     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
761              ist->file_index, ist->st->index);
762
763
764     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
765                                             args.str, NULL, fg->graph)) < 0)
766         goto fail;
767     par->hw_frames_ctx = ifilter->hw_frames_ctx;
768     ret = av_buffersrc_parameters_set(ifilter->filter, par);
769     if (ret < 0)
770         goto fail;
771     av_freep(&par);
772     last_filter = ifilter->filter;
773
774     if (ist->autorotate) {
775         double theta = get_rotation(ist->st);
776
777         if (fabs(theta - 90) < 1.0) {
778             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
779         } else if (fabs(theta - 180) < 1.0) {
780             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
781             if (ret < 0)
782                 return ret;
783             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
784         } else if (fabs(theta - 270) < 1.0) {
785             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
786         } else if (fabs(theta) > 1.0) {
787             char rotate_buf[64];
788             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
789             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
790         }
791         if (ret < 0)
792             return ret;
793     }
794
795     if (ist->framerate.num) {
796         AVFilterContext *setpts;
797
798         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
799                  ist->file_index, ist->st->index);
800         if ((ret = avfilter_graph_create_filter(&setpts,
801                                                 avfilter_get_by_name("setpts"),
802                                                 name, "N", NULL,
803                                                 fg->graph)) < 0)
804             return ret;
805
806         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
807             return ret;
808
809         last_filter = setpts;
810     }
811
812     if (do_deinterlace) {
813         AVFilterContext *yadif;
814
815         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
816                  ist->file_index, ist->st->index);
817         if ((ret = avfilter_graph_create_filter(&yadif,
818                                                 avfilter_get_by_name("yadif"),
819                                                 name, "", NULL,
820                                                 fg->graph)) < 0)
821             return ret;
822
823         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
824             return ret;
825
826         last_filter = yadif;
827     }
828
829     snprintf(name, sizeof(name), "trim for input stream %d:%d",
830              ist->file_index, ist->st->index);
831     if (copy_ts) {
832         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
833         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
834             tsoffset += f->ctx->start_time;
835     }
836     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
837                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
838                       &last_filter, &pad_idx, name);
839     if (ret < 0)
840         return ret;
841
842     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
843         return ret;
844     return 0;
845 fail:
846     av_freep(&par);
847
848     return ret;
849 }
850
851 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
852                                         AVFilterInOut *in)
853 {
854     AVFilterContext *last_filter;
855     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
856     InputStream *ist = ifilter->ist;
857     InputFile     *f = input_files[ist->file_index];
858     AVBPrint args;
859     char name[255];
860     int ret, pad_idx = 0;
861     int64_t tsoffset = 0;
862
863     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
864         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
865         return AVERROR(EINVAL);
866     }
867
868     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
869     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
870              1, ifilter->sample_rate,
871              ifilter->sample_rate,
872              av_get_sample_fmt_name(ifilter->format));
873     if (ifilter->channel_layout)
874         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
875                    ifilter->channel_layout);
876     else
877         av_bprintf(&args, ":channels=%d", ifilter->channels);
878     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
879              ist->file_index, ist->st->index);
880
881     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
882                                             name, args.str, NULL,
883                                             fg->graph)) < 0)
884         return ret;
885     last_filter = ifilter->filter;
886
887 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
888     AVFilterContext *filt_ctx;                                              \
889                                                                             \
890     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
891            "similarly to -af " filter_name "=%s.\n", arg);                  \
892                                                                             \
893     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
894                 fg->index, filter_name, ist->file_index, ist->st->index);   \
895     ret = avfilter_graph_create_filter(&filt_ctx,                           \
896                                        avfilter_get_by_name(filter_name),   \
897                                        name, arg, NULL, fg->graph);         \
898     if (ret < 0)                                                            \
899         return ret;                                                         \
900                                                                             \
901     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
902     if (ret < 0)                                                            \
903         return ret;                                                         \
904                                                                             \
905     last_filter = filt_ctx;                                                 \
906 } while (0)
907
908     if (audio_sync_method > 0) {
909         char args[256] = {0};
910
911         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
912         if (audio_drift_threshold != 0.1)
913             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
914         if (!fg->reconfiguration)
915             av_strlcatf(args, sizeof(args), ":first_pts=0");
916         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
917     }
918
919 //     if (ost->audio_channels_mapped) {
920 //         int i;
921 //         AVBPrint pan_buf;
922 //         av_bprint_init(&pan_buf, 256, 8192);
923 //         av_bprintf(&pan_buf, "0x%"PRIx64,
924 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
925 //         for (i = 0; i < ost->audio_channels_mapped; i++)
926 //             if (ost->audio_channels_map[i] != -1)
927 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
928 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
929 //         av_bprint_finalize(&pan_buf, NULL);
930 //     }
931
932     if (audio_volume != 256) {
933         char args[256];
934
935         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
936                "audio filter instead.\n");
937
938         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
939         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
940     }
941
942     snprintf(name, sizeof(name), "trim for input stream %d:%d",
943              ist->file_index, ist->st->index);
944     if (copy_ts) {
945         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
946         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
947             tsoffset += f->ctx->start_time;
948     }
949     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
950                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
951                       &last_filter, &pad_idx, name);
952     if (ret < 0)
953         return ret;
954
955     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
956         return ret;
957
958     return 0;
959 }
960
961 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
962                                   AVFilterInOut *in)
963 {
964     av_freep(&ifilter->name);
965     DESCRIBE_FILTER_LINK(ifilter, in, 1);
966
967     if (!ifilter->ist->dec) {
968         av_log(NULL, AV_LOG_ERROR,
969                "No decoder for stream #%d:%d, filtering impossible\n",
970                ifilter->ist->file_index, ifilter->ist->st->index);
971         return AVERROR_DECODER_NOT_FOUND;
972     }
973     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
974     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
975     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
976     default: av_assert0(0);
977     }
978 }
979
980 int configure_filtergraph(FilterGraph *fg)
981 {
982     AVFilterInOut *inputs, *outputs, *cur;
983     int ret, i, simple = filtergraph_is_simple(fg);
984     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
985                                       fg->graph_desc;
986
987     avfilter_graph_free(&fg->graph);
988     if (!(fg->graph = avfilter_graph_alloc()))
989         return AVERROR(ENOMEM);
990
991     if (simple) {
992         OutputStream *ost = fg->outputs[0]->ost;
993         char args[512];
994         AVDictionaryEntry *e = NULL;
995
996         fg->graph->nb_threads = filter_complex_nbthreads;
997
998         args[0] = 0;
999         while ((e = av_dict_get(ost->sws_dict, "", e,
1000                                 AV_DICT_IGNORE_SUFFIX))) {
1001             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1002         }
1003         if (strlen(args))
1004             args[strlen(args)-1] = 0;
1005         fg->graph->scale_sws_opts = av_strdup(args);
1006
1007         args[0] = 0;
1008         while ((e = av_dict_get(ost->swr_opts, "", e,
1009                                 AV_DICT_IGNORE_SUFFIX))) {
1010             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1011         }
1012         if (strlen(args))
1013             args[strlen(args)-1] = 0;
1014         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
1015
1016         args[0] = '\0';
1017         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
1018                                 AV_DICT_IGNORE_SUFFIX))) {
1019             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1020         }
1021         if (strlen(args))
1022             args[strlen(args) - 1] = '\0';
1023         fg->graph->resample_lavr_opts = av_strdup(args);
1024
1025         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
1026         if (e)
1027             av_opt_set(fg->graph, "threads", e->value, 0);
1028     } else {
1029         fg->graph->nb_threads = filter_nbthreads;
1030     }
1031
1032     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1033         return ret;
1034
1035     if (hw_device_ctx) {
1036         for (i = 0; i < fg->graph->nb_filters; i++) {
1037             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
1038         }
1039     }
1040
1041     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1042         const char *num_inputs;
1043         const char *num_outputs;
1044         if (!outputs) {
1045             num_outputs = "0";
1046         } else if (outputs->next) {
1047             num_outputs = ">1";
1048         } else {
1049             num_outputs = "1";
1050         }
1051         if (!inputs) {
1052             num_inputs = "0";
1053         } else if (inputs->next) {
1054             num_inputs = ">1";
1055         } else {
1056             num_inputs = "1";
1057         }
1058         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1059                "to have exactly 1 input and 1 output."
1060                " However, it had %s input(s) and %s output(s)."
1061                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1062                graph_desc, num_inputs, num_outputs);
1063         return AVERROR(EINVAL);
1064     }
1065
1066     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1067         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1068             avfilter_inout_free(&inputs);
1069             avfilter_inout_free(&outputs);
1070             return ret;
1071         }
1072     avfilter_inout_free(&inputs);
1073
1074     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1075         configure_output_filter(fg, fg->outputs[i], cur);
1076     avfilter_inout_free(&outputs);
1077
1078     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1079         return ret;
1080
1081     /* limit the lists of allowed formats to the ones selected, to
1082      * make sure they stay the same if the filtergraph is reconfigured later */
1083     for (i = 0; i < fg->nb_outputs; i++) {
1084         OutputFilter *ofilter = fg->outputs[i];
1085         AVFilterLink *link = ofilter->filter->inputs[0];
1086
1087         ofilter->format = link->format;
1088
1089         ofilter->width  = link->w;
1090         ofilter->height = link->h;
1091
1092         ofilter->sample_rate    = link->sample_rate;
1093         ofilter->channel_layout = link->channel_layout;
1094     }
1095
1096     fg->reconfiguration = 1;
1097
1098     for (i = 0; i < fg->nb_outputs; i++) {
1099         OutputStream *ost = fg->outputs[i]->ost;
1100         if (!ost->enc) {
1101             /* identical to the same check in ffmpeg.c, needed because
1102                complex filter graphs are initialized earlier */
1103             av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
1104                      avcodec_get_name(ost->st->codecpar->codec_id), ost->file_index, ost->index);
1105             return AVERROR(EINVAL);
1106         }
1107         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1108             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1109             av_buffersink_set_frame_size(ost->filter->filter,
1110                                          ost->enc_ctx->frame_size);
1111     }
1112
1113     return 0;
1114 }
1115
1116 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
1117 {
1118     av_buffer_unref(&ifilter->hw_frames_ctx);
1119
1120     ifilter->format = frame->format;
1121
1122     ifilter->width               = frame->width;
1123     ifilter->height              = frame->height;
1124     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
1125
1126     ifilter->sample_rate         = frame->sample_rate;
1127     ifilter->channels            = av_frame_get_channels(frame);
1128     ifilter->channel_layout      = frame->channel_layout;
1129
1130     if (frame->hw_frames_ctx) {
1131         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
1132         if (!ifilter->hw_frames_ctx)
1133             return AVERROR(ENOMEM);
1134     }
1135
1136     return 0;
1137 }
1138
1139 int ifilter_parameters_from_decoder(InputFilter *ifilter, const AVCodecContext *avctx)
1140 {
1141     av_buffer_unref(&ifilter->hw_frames_ctx);
1142
1143     if (avctx->codec_type == AVMEDIA_TYPE_VIDEO)
1144         ifilter->format = avctx->pix_fmt;
1145     else
1146         ifilter->format = avctx->sample_fmt;
1147
1148     ifilter->width               = avctx->width;
1149     ifilter->height              = avctx->height;
1150     if (ifilter->ist && ifilter->ist->st && ifilter->ist->st->sample_aspect_ratio.num)
1151         ifilter->sample_aspect_ratio = ifilter->ist->st->sample_aspect_ratio;
1152     else
1153         ifilter->sample_aspect_ratio = avctx->sample_aspect_ratio;
1154
1155     ifilter->sample_rate         = avctx->sample_rate;
1156     ifilter->channels            = avctx->channels;
1157     ifilter->channel_layout      = avctx->channel_layout;
1158
1159     if (ifilter->ist && ifilter->ist->hw_frames_ctx) {
1160         ifilter->format = ifilter->ist->resample_pix_fmt;
1161         ifilter->hw_frames_ctx = av_buffer_ref(ifilter->ist->hw_frames_ctx);
1162         if (!ifilter->hw_frames_ctx)
1163             return AVERROR(ENOMEM);
1164     }
1165
1166     return 0;
1167 }
1168
1169 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1170 {
1171     int i;
1172     for (i = 0; i < fg->nb_inputs; i++)
1173         if (fg->inputs[i]->ist == ist)
1174             return 1;
1175     return 0;
1176 }
1177
1178 int filtergraph_is_simple(FilterGraph *fg)
1179 {
1180     return !fg->graph_desc;
1181 }