Merge commit '15b4f494fc6bddb8178fdb5aed18b420efc75e22'
[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 static const enum AVPixelFormat *get_compliance_unofficial_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
43 {
44     static const enum AVPixelFormat mjpeg_formats[] =
45         { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
46           AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
47           AV_PIX_FMT_NONE };
48     static const enum AVPixelFormat ljpeg_formats[] =
49         { AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
50           AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
51           AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
52           AV_PIX_FMT_NONE};
53
54     if (codec_id == AV_CODEC_ID_MJPEG) {
55         return mjpeg_formats;
56     } else if (codec_id == AV_CODEC_ID_LJPEG) {
57         return ljpeg_formats;
58     } else {
59         return default_formats;
60     }
61 }
62
63 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
64 {
65     if (codec && codec->pix_fmts) {
66         const enum AVPixelFormat *p = codec->pix_fmts;
67         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
68         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
69         enum AVPixelFormat best= AV_PIX_FMT_NONE;
70
71         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
72             p = get_compliance_unofficial_pix_fmts(enc_ctx->codec_id, p);
73         }
74         for (; *p != AV_PIX_FMT_NONE; p++) {
75             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
76             if (*p == target)
77                 break;
78         }
79         if (*p == AV_PIX_FMT_NONE) {
80             if (target != AV_PIX_FMT_NONE)
81                 av_log(NULL, AV_LOG_WARNING,
82                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
83                        av_get_pix_fmt_name(target),
84                        codec->name,
85                        av_get_pix_fmt_name(best));
86             return best;
87         }
88     }
89     return target;
90 }
91
92 void choose_sample_fmt(AVStream *st, AVCodec *codec)
93 {
94     if (codec && codec->sample_fmts) {
95         const enum AVSampleFormat *p = codec->sample_fmts;
96         for (; *p != -1; p++) {
97             if (*p == st->codecpar->format)
98                 break;
99         }
100         if (*p == -1) {
101             if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codecpar->format) > av_get_sample_fmt_name(codec->sample_fmts[0]))
102                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
103             if(av_get_sample_fmt_name(st->codecpar->format))
104             av_log(NULL, AV_LOG_WARNING,
105                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
106                    av_get_sample_fmt_name(st->codecpar->format),
107                    codec->name,
108                    av_get_sample_fmt_name(codec->sample_fmts[0]));
109             st->codecpar->format = codec->sample_fmts[0];
110         }
111     }
112 }
113
114 static char *choose_pix_fmts(OutputFilter *ofilter)
115 {
116     OutputStream *ost = ofilter->ost;
117     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
118     if (strict_dict)
119         // used by choose_pixel_fmt() and below
120         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
121
122      if (ost->keep_pix_fmt) {
123         avfilter_graph_set_auto_convert(ofilter->graph->graph,
124                                             AVFILTER_AUTO_CONVERT_NONE);
125         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
126             return NULL;
127         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
128     }
129     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
130         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
131     } else if (ost->enc && ost->enc->pix_fmts) {
132         const enum AVPixelFormat *p;
133         AVIOContext *s = NULL;
134         uint8_t *ret;
135         int len;
136
137         if (avio_open_dyn_buf(&s) < 0)
138             exit_program(1);
139
140         p = ost->enc->pix_fmts;
141         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
142             p = get_compliance_unofficial_pix_fmts(ost->enc_ctx->codec_id, p);
143         }
144
145         for (; *p != AV_PIX_FMT_NONE; p++) {
146             const char *name = av_get_pix_fmt_name(*p);
147             avio_printf(s, "%s|", name);
148         }
149         len = avio_close_dyn_buf(s, &ret);
150         ret[len - 1] = 0;
151         return ret;
152     } else
153         return NULL;
154 }
155
156 /* Define a function for building a string containing a list of
157  * allowed formats. */
158 #define DEF_CHOOSE_FORMAT(suffix, type, var, supported_list, none, get_name)   \
159 static char *choose_ ## suffix (OutputFilter *ofilter)                         \
160 {                                                                              \
161     if (ofilter->var != none) {                                                \
162         get_name(ofilter->var);                                                \
163         return av_strdup(name);                                                \
164     } else if (ofilter->supported_list) {                                      \
165         const type *p;                                                         \
166         AVIOContext *s = NULL;                                                 \
167         uint8_t *ret;                                                          \
168         int len;                                                               \
169                                                                                \
170         if (avio_open_dyn_buf(&s) < 0)                                         \
171             exit_program(1);                                                           \
172                                                                                \
173         for (p = ofilter->supported_list; *p != none; p++) {                   \
174             get_name(*p);                                                      \
175             avio_printf(s, "%s|", name);                                       \
176         }                                                                      \
177         len = avio_close_dyn_buf(s, &ret);                                     \
178         ret[len - 1] = 0;                                                      \
179         return ret;                                                            \
180     } else                                                                     \
181         return NULL;                                                           \
182 }
183
184 //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
185 //                  GET_PIX_FMT_NAME)
186
187 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
188                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
189
190 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
191                   GET_SAMPLE_RATE_NAME)
192
193 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
194                   GET_CH_LAYOUT_NAME)
195
196 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
197 {
198     FilterGraph *fg = av_mallocz(sizeof(*fg));
199
200     if (!fg)
201         exit_program(1);
202     fg->index = nb_filtergraphs;
203
204     GROW_ARRAY(fg->outputs, fg->nb_outputs);
205     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
206         exit_program(1);
207     fg->outputs[0]->ost   = ost;
208     fg->outputs[0]->graph = fg;
209     fg->outputs[0]->format = -1;
210
211     ost->filter = fg->outputs[0];
212
213     GROW_ARRAY(fg->inputs, fg->nb_inputs);
214     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
215         exit_program(1);
216     fg->inputs[0]->ist   = ist;
217     fg->inputs[0]->graph = fg;
218     fg->inputs[0]->format = -1;
219
220     fg->inputs[0]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
221     if (!fg->inputs[0]->frame_queue)
222         exit_program(1);
223
224     GROW_ARRAY(ist->filters, ist->nb_filters);
225     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
226
227     GROW_ARRAY(filtergraphs, nb_filtergraphs);
228     filtergraphs[nb_filtergraphs - 1] = fg;
229
230     return 0;
231 }
232
233 static char *describe_filter_link(FilterGraph *fg, AVFilterInOut *inout, int in)
234 {
235     AVFilterContext *ctx = inout->filter_ctx;
236     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;
237     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;
238     AVIOContext *pb;
239     uint8_t *res = NULL;
240
241     if (avio_open_dyn_buf(&pb) < 0)
242         exit_program(1);
243
244     avio_printf(pb, "%s", ctx->filter->name);
245     if (nb_pads > 1)
246         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));
247     avio_w8(pb, 0);
248     avio_close_dyn_buf(pb, &res);
249     return res;
250 }
251
252 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
253 {
254     InputStream *ist = NULL;
255     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
256     int i;
257
258     // TODO: support other filter types
259     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
260         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
261                "currently.\n");
262         exit_program(1);
263     }
264
265     if (in->name) {
266         AVFormatContext *s;
267         AVStream       *st = NULL;
268         char *p;
269         int file_idx = strtol(in->name, &p, 0);
270
271         if (file_idx < 0 || file_idx >= nb_input_files) {
272             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
273                    file_idx, fg->graph_desc);
274             exit_program(1);
275         }
276         s = input_files[file_idx]->ctx;
277
278         for (i = 0; i < s->nb_streams; i++) {
279             enum AVMediaType stream_type = s->streams[i]->codecpar->codec_type;
280             if (stream_type != type &&
281                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
282                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
283                 continue;
284             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
285                 st = s->streams[i];
286                 break;
287             }
288         }
289         if (!st) {
290             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
291                    "matches no streams.\n", p, fg->graph_desc);
292             exit_program(1);
293         }
294         ist = input_streams[input_files[file_idx]->ist_index + st->index];
295     } else {
296         /* find the first unused stream of corresponding type */
297         for (i = 0; i < nb_input_streams; i++) {
298             ist = input_streams[i];
299             if (ist->dec_ctx->codec_type == type && ist->discard)
300                 break;
301         }
302         if (i == nb_input_streams) {
303             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
304                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
305                    in->filter_ctx->name);
306             exit_program(1);
307         }
308     }
309     av_assert0(ist);
310
311     ist->discard         = 0;
312     ist->decoding_needed |= DECODING_FOR_FILTER;
313     ist->st->discard = AVDISCARD_NONE;
314
315     GROW_ARRAY(fg->inputs, fg->nb_inputs);
316     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
317         exit_program(1);
318     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
319     fg->inputs[fg->nb_inputs - 1]->graph = fg;
320     fg->inputs[fg->nb_inputs - 1]->format = -1;
321     fg->inputs[fg->nb_inputs - 1]->type = ist->st->codecpar->codec_type;
322     fg->inputs[fg->nb_inputs - 1]->name = describe_filter_link(fg, in, 1);
323
324     fg->inputs[fg->nb_inputs - 1]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
325     if (!fg->inputs[fg->nb_inputs - 1]->frame_queue)
326         exit_program(1);
327
328     GROW_ARRAY(ist->filters, ist->nb_filters);
329     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
330 }
331
332 int init_complex_filtergraph(FilterGraph *fg)
333 {
334     AVFilterInOut *inputs, *outputs, *cur;
335     AVFilterGraph *graph;
336     int ret = 0;
337
338     /* this graph is only used for determining the kinds of inputs
339      * and outputs we have, and is discarded on exit from this function */
340     graph = avfilter_graph_alloc();
341     if (!graph)
342         return AVERROR(ENOMEM);
343
344     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
345     if (ret < 0)
346         goto fail;
347
348     for (cur = inputs; cur; cur = cur->next)
349         init_input_filter(fg, cur);
350
351     for (cur = outputs; cur;) {
352         GROW_ARRAY(fg->outputs, fg->nb_outputs);
353         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
354         if (!fg->outputs[fg->nb_outputs - 1])
355             exit_program(1);
356
357         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
358         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
359         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
360                                                                          cur->pad_idx);
361         fg->outputs[fg->nb_outputs - 1]->name = describe_filter_link(fg, cur, 0);
362         cur = cur->next;
363         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
364     }
365
366 fail:
367     avfilter_inout_free(&inputs);
368     avfilter_graph_free(&graph);
369     return ret;
370 }
371
372 static int insert_trim(int64_t start_time, int64_t duration,
373                        AVFilterContext **last_filter, int *pad_idx,
374                        const char *filter_name)
375 {
376     AVFilterGraph *graph = (*last_filter)->graph;
377     AVFilterContext *ctx;
378     const AVFilter *trim;
379     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
380     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
381     int ret = 0;
382
383     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
384         return 0;
385
386     trim = avfilter_get_by_name(name);
387     if (!trim) {
388         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
389                "recording time.\n", name);
390         return AVERROR_FILTER_NOT_FOUND;
391     }
392
393     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
394     if (!ctx)
395         return AVERROR(ENOMEM);
396
397     if (duration != INT64_MAX) {
398         ret = av_opt_set_int(ctx, "durationi", duration,
399                                 AV_OPT_SEARCH_CHILDREN);
400     }
401     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
402         ret = av_opt_set_int(ctx, "starti", start_time,
403                                 AV_OPT_SEARCH_CHILDREN);
404     }
405     if (ret < 0) {
406         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
407         return ret;
408     }
409
410     ret = avfilter_init_str(ctx, NULL);
411     if (ret < 0)
412         return ret;
413
414     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
415     if (ret < 0)
416         return ret;
417
418     *last_filter = ctx;
419     *pad_idx     = 0;
420     return 0;
421 }
422
423 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
424                          const char *filter_name, const char *args)
425 {
426     AVFilterGraph *graph = (*last_filter)->graph;
427     AVFilterContext *ctx;
428     int ret;
429
430     ret = avfilter_graph_create_filter(&ctx,
431                                        avfilter_get_by_name(filter_name),
432                                        filter_name, args, NULL, graph);
433     if (ret < 0)
434         return ret;
435
436     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
437     if (ret < 0)
438         return ret;
439
440     *last_filter = ctx;
441     *pad_idx     = 0;
442     return 0;
443 }
444
445 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
446 {
447     char *pix_fmts;
448     OutputStream *ost = ofilter->ost;
449     OutputFile    *of = output_files[ost->file_index];
450     AVFilterContext *last_filter = out->filter_ctx;
451     int pad_idx = out->pad_idx;
452     int ret;
453     char name[255];
454
455     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
456     ret = avfilter_graph_create_filter(&ofilter->filter,
457                                        avfilter_get_by_name("buffersink"),
458                                        name, NULL, NULL, fg->graph);
459
460     if (ret < 0)
461         return ret;
462
463     if (!hw_device_ctx && (ofilter->width || ofilter->height)) {
464         char args[255];
465         AVFilterContext *filter;
466         AVDictionaryEntry *e = NULL;
467
468         snprintf(args, sizeof(args), "%d:%d",
469                  ofilter->width, ofilter->height);
470
471         while ((e = av_dict_get(ost->sws_dict, "", e,
472                                 AV_DICT_IGNORE_SUFFIX))) {
473             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
474         }
475
476         snprintf(name, sizeof(name), "scaler_out_%d_%d",
477                  ost->file_index, ost->index);
478         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
479                                                 name, args, NULL, fg->graph)) < 0)
480             return ret;
481         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
482             return ret;
483
484         last_filter = filter;
485         pad_idx = 0;
486     }
487
488     if ((pix_fmts = choose_pix_fmts(ofilter))) {
489         AVFilterContext *filter;
490         snprintf(name, sizeof(name), "format_out_%d_%d",
491                  ost->file_index, ost->index);
492         ret = avfilter_graph_create_filter(&filter,
493                                            avfilter_get_by_name("format"),
494                                            "format", pix_fmts, NULL, fg->graph);
495         av_freep(&pix_fmts);
496         if (ret < 0)
497             return ret;
498         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
499             return ret;
500
501         last_filter = filter;
502         pad_idx     = 0;
503     }
504
505     if (ost->frame_rate.num && 0) {
506         AVFilterContext *fps;
507         char args[255];
508
509         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
510                  ost->frame_rate.den);
511         snprintf(name, sizeof(name), "fps_out_%d_%d",
512                  ost->file_index, ost->index);
513         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
514                                            name, args, NULL, fg->graph);
515         if (ret < 0)
516             return ret;
517
518         ret = avfilter_link(last_filter, pad_idx, fps, 0);
519         if (ret < 0)
520             return ret;
521         last_filter = fps;
522         pad_idx = 0;
523     }
524
525     snprintf(name, sizeof(name), "trim_out_%d_%d",
526              ost->file_index, ost->index);
527     ret = insert_trim(of->start_time, of->recording_time,
528                       &last_filter, &pad_idx, name);
529     if (ret < 0)
530         return ret;
531
532
533     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
534         return ret;
535
536     return 0;
537 }
538
539 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
540 {
541     OutputStream *ost = ofilter->ost;
542     OutputFile    *of = output_files[ost->file_index];
543     AVCodecContext *codec  = ost->enc_ctx;
544     AVFilterContext *last_filter = out->filter_ctx;
545     int pad_idx = out->pad_idx;
546     char *sample_fmts, *sample_rates, *channel_layouts;
547     char name[255];
548     int ret;
549
550     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
551     ret = avfilter_graph_create_filter(&ofilter->filter,
552                                        avfilter_get_by_name("abuffersink"),
553                                        name, NULL, NULL, fg->graph);
554     if (ret < 0)
555         return ret;
556     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
557         return ret;
558
559 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
560     AVFilterContext *filt_ctx;                                              \
561                                                                             \
562     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
563            "similarly to -af " filter_name "=%s.\n", arg);                  \
564                                                                             \
565     ret = avfilter_graph_create_filter(&filt_ctx,                           \
566                                        avfilter_get_by_name(filter_name),   \
567                                        filter_name, arg, NULL, fg->graph);  \
568     if (ret < 0)                                                            \
569         return ret;                                                         \
570                                                                             \
571     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
572     if (ret < 0)                                                            \
573         return ret;                                                         \
574                                                                             \
575     last_filter = filt_ctx;                                                 \
576     pad_idx = 0;                                                            \
577 } while (0)
578     if (ost->audio_channels_mapped) {
579         int i;
580         AVBPrint pan_buf;
581         av_bprint_init(&pan_buf, 256, 8192);
582         av_bprintf(&pan_buf, "0x%"PRIx64,
583                    av_get_default_channel_layout(ost->audio_channels_mapped));
584         for (i = 0; i < ost->audio_channels_mapped; i++)
585             if (ost->audio_channels_map[i] != -1)
586                 av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
587
588         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
589         av_bprint_finalize(&pan_buf, NULL);
590     }
591
592     if (codec->channels && !codec->channel_layout)
593         codec->channel_layout = av_get_default_channel_layout(codec->channels);
594
595     sample_fmts     = choose_sample_fmts(ofilter);
596     sample_rates    = choose_sample_rates(ofilter);
597     channel_layouts = choose_channel_layouts(ofilter);
598     if (sample_fmts || sample_rates || channel_layouts) {
599         AVFilterContext *format;
600         char args[256];
601         args[0] = 0;
602
603         if (sample_fmts)
604             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
605                             sample_fmts);
606         if (sample_rates)
607             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
608                             sample_rates);
609         if (channel_layouts)
610             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
611                             channel_layouts);
612
613         av_freep(&sample_fmts);
614         av_freep(&sample_rates);
615         av_freep(&channel_layouts);
616
617         snprintf(name, sizeof(name), "format_out_%d_%d",
618                  ost->file_index, ost->index);
619         ret = avfilter_graph_create_filter(&format,
620                                            avfilter_get_by_name("aformat"),
621                                            name, args, NULL, fg->graph);
622         if (ret < 0)
623             return ret;
624
625         ret = avfilter_link(last_filter, pad_idx, format, 0);
626         if (ret < 0)
627             return ret;
628
629         last_filter = format;
630         pad_idx = 0;
631     }
632
633     if (audio_volume != 256 && 0) {
634         char args[256];
635
636         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
637         AUTO_INSERT_FILTER("-vol", "volume", args);
638     }
639
640     if (ost->apad && of->shortest) {
641         char args[256];
642         int i;
643
644         for (i=0; i<of->ctx->nb_streams; i++)
645             if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
646                 break;
647
648         if (i<of->ctx->nb_streams) {
649             snprintf(args, sizeof(args), "%s", ost->apad);
650             AUTO_INSERT_FILTER("-apad", "apad", args);
651         }
652     }
653
654     snprintf(name, sizeof(name), "trim for output stream %d:%d",
655              ost->file_index, ost->index);
656     ret = insert_trim(of->start_time, of->recording_time,
657                       &last_filter, &pad_idx, name);
658     if (ret < 0)
659         return ret;
660
661     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
662         return ret;
663
664     return 0;
665 }
666
667 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
668 {
669     if (!ofilter->ost) {
670         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
671         exit_program(1);
672     }
673
674     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
675     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
676     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
677     default: av_assert0(0);
678     }
679 }
680
681 static int sub2video_prepare(InputStream *ist, InputFilter *ifilter)
682 {
683     AVFormatContext *avf = input_files[ist->file_index]->ctx;
684     int i, w, h;
685
686     /* Compute the size of the canvas for the subtitles stream.
687        If the subtitles codecpar has set a size, use it. Otherwise use the
688        maximum dimensions of the video streams in the same file. */
689     w = ifilter->width;
690     h = ifilter->height;
691     if (!(w && h)) {
692         for (i = 0; i < avf->nb_streams; i++) {
693             if (avf->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
694                 w = FFMAX(w, avf->streams[i]->codecpar->width);
695                 h = FFMAX(h, avf->streams[i]->codecpar->height);
696             }
697         }
698         if (!(w && h)) {
699             w = FFMAX(w, 720);
700             h = FFMAX(h, 576);
701         }
702         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
703     }
704     ist->sub2video.w = ifilter->width  = w;
705     ist->sub2video.h = ifilter->height = h;
706
707     ifilter->width  = ist->dec_ctx->width  ? ist->dec_ctx->width  : ist->sub2video.w;
708     ifilter->height = ist->dec_ctx->height ? ist->dec_ctx->height : ist->sub2video.h;
709
710     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
711        palettes for all rectangles are identical or compatible */
712     ifilter->format = AV_PIX_FMT_RGB32;
713
714     ist->sub2video.frame = av_frame_alloc();
715     if (!ist->sub2video.frame)
716         return AVERROR(ENOMEM);
717     ist->sub2video.last_pts = INT64_MIN;
718     return 0;
719 }
720
721 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
722                                         AVFilterInOut *in)
723 {
724     AVFilterContext *last_filter;
725     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
726     InputStream *ist = ifilter->ist;
727     InputFile     *f = input_files[ist->file_index];
728     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
729                                          ist->st->time_base;
730     AVRational fr = ist->framerate;
731     AVRational sar;
732     AVBPrint args;
733     char name[255];
734     int ret, pad_idx = 0;
735     int64_t tsoffset = 0;
736     AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
737
738     if (!par)
739         return AVERROR(ENOMEM);
740     memset(par, 0, sizeof(*par));
741     par->format = AV_PIX_FMT_NONE;
742
743     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
744         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
745         ret = AVERROR(EINVAL);
746         goto fail;
747     }
748
749     if (!fr.num)
750         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
751
752     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
753         ret = sub2video_prepare(ist, ifilter);
754         if (ret < 0)
755             goto fail;
756     }
757
758     sar = ifilter->sample_aspect_ratio;
759     if(!sar.den)
760         sar = (AVRational){0,1};
761     av_bprint_init(&args, 0, 1);
762     av_bprintf(&args,
763              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
764              "pixel_aspect=%d/%d:sws_param=flags=%d",
765              ifilter->width, ifilter->height, ifilter->format,
766              tb.num, tb.den, sar.num, sar.den,
767              SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
768     if (fr.num && fr.den)
769         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
770     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
771              ist->file_index, ist->st->index);
772
773
774     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
775                                             args.str, NULL, fg->graph)) < 0)
776         goto fail;
777     par->hw_frames_ctx = ifilter->hw_frames_ctx;
778     ret = av_buffersrc_parameters_set(ifilter->filter, par);
779     if (ret < 0)
780         goto fail;
781     av_freep(&par);
782     last_filter = ifilter->filter;
783
784     if (ist->autorotate) {
785         double theta = get_rotation(ist->st);
786
787         if (fabs(theta - 90) < 1.0) {
788             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
789         } else if (fabs(theta - 180) < 1.0) {
790             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
791             if (ret < 0)
792                 return ret;
793             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
794         } else if (fabs(theta - 270) < 1.0) {
795             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
796         } else if (fabs(theta) > 1.0) {
797             char rotate_buf[64];
798             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
799             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
800         }
801         if (ret < 0)
802             return ret;
803     }
804
805     if (do_deinterlace) {
806         AVFilterContext *yadif;
807
808         snprintf(name, sizeof(name), "deinterlace_in_%d_%d",
809                  ist->file_index, ist->st->index);
810         if ((ret = avfilter_graph_create_filter(&yadif,
811                                                 avfilter_get_by_name("yadif"),
812                                                 name, "", NULL,
813                                                 fg->graph)) < 0)
814             return ret;
815
816         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
817             return ret;
818
819         last_filter = yadif;
820     }
821
822     snprintf(name, sizeof(name), "trim_in_%d_%d",
823              ist->file_index, ist->st->index);
824     if (copy_ts) {
825         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
826         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
827             tsoffset += f->ctx->start_time;
828     }
829     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
830                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
831                       &last_filter, &pad_idx, name);
832     if (ret < 0)
833         return ret;
834
835     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
836         return ret;
837     return 0;
838 fail:
839     av_freep(&par);
840
841     return ret;
842 }
843
844 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
845                                         AVFilterInOut *in)
846 {
847     AVFilterContext *last_filter;
848     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
849     InputStream *ist = ifilter->ist;
850     InputFile     *f = input_files[ist->file_index];
851     AVBPrint args;
852     char name[255];
853     int ret, pad_idx = 0;
854     int64_t tsoffset = 0;
855
856     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
857         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
858         return AVERROR(EINVAL);
859     }
860
861     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
862     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
863              1, ifilter->sample_rate,
864              ifilter->sample_rate,
865              av_get_sample_fmt_name(ifilter->format));
866     if (ifilter->channel_layout)
867         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
868                    ifilter->channel_layout);
869     else
870         av_bprintf(&args, ":channels=%d", ifilter->channels);
871     snprintf(name, sizeof(name), "graph_%d_in_%d_%d", fg->index,
872              ist->file_index, ist->st->index);
873
874     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
875                                             name, args.str, NULL,
876                                             fg->graph)) < 0)
877         return ret;
878     last_filter = ifilter->filter;
879
880 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
881     AVFilterContext *filt_ctx;                                              \
882                                                                             \
883     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
884            "similarly to -af " filter_name "=%s.\n", arg);                  \
885                                                                             \
886     snprintf(name, sizeof(name), "graph_%d_%s_in_%d_%d",      \
887                 fg->index, filter_name, ist->file_index, ist->st->index);   \
888     ret = avfilter_graph_create_filter(&filt_ctx,                           \
889                                        avfilter_get_by_name(filter_name),   \
890                                        name, arg, NULL, fg->graph);         \
891     if (ret < 0)                                                            \
892         return ret;                                                         \
893                                                                             \
894     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
895     if (ret < 0)                                                            \
896         return ret;                                                         \
897                                                                             \
898     last_filter = filt_ctx;                                                 \
899 } while (0)
900
901     if (audio_sync_method > 0) {
902         char args[256] = {0};
903
904         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
905         if (audio_drift_threshold != 0.1)
906             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
907         if (!fg->reconfiguration)
908             av_strlcatf(args, sizeof(args), ":first_pts=0");
909         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
910     }
911
912 //     if (ost->audio_channels_mapped) {
913 //         int i;
914 //         AVBPrint pan_buf;
915 //         av_bprint_init(&pan_buf, 256, 8192);
916 //         av_bprintf(&pan_buf, "0x%"PRIx64,
917 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
918 //         for (i = 0; i < ost->audio_channels_mapped; i++)
919 //             if (ost->audio_channels_map[i] != -1)
920 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
921 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
922 //         av_bprint_finalize(&pan_buf, NULL);
923 //     }
924
925     if (audio_volume != 256) {
926         char args[256];
927
928         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
929                "audio filter instead.\n");
930
931         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
932         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
933     }
934
935     snprintf(name, sizeof(name), "trim for input stream %d:%d",
936              ist->file_index, ist->st->index);
937     if (copy_ts) {
938         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
939         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
940             tsoffset += f->ctx->start_time;
941     }
942     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
943                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
944                       &last_filter, &pad_idx, name);
945     if (ret < 0)
946         return ret;
947
948     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
949         return ret;
950
951     return 0;
952 }
953
954 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
955                                   AVFilterInOut *in)
956 {
957     if (!ifilter->ist->dec) {
958         av_log(NULL, AV_LOG_ERROR,
959                "No decoder for stream #%d:%d, filtering impossible\n",
960                ifilter->ist->file_index, ifilter->ist->st->index);
961         return AVERROR_DECODER_NOT_FOUND;
962     }
963     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
964     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
965     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
966     default: av_assert0(0);
967     }
968 }
969
970 static void cleanup_filtergraph(FilterGraph *fg)
971 {
972     int i;
973     for (i = 0; i < fg->nb_outputs; i++)
974         fg->outputs[i]->filter = (AVFilterContext *)NULL;
975     for (i = 0; i < fg->nb_inputs; i++)
976         fg->inputs[i]->filter = (AVFilterContext *)NULL;
977     avfilter_graph_free(&fg->graph);
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     cleanup_filtergraph(fg);
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_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
1024         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
1025         if (e)
1026             av_opt_set(fg->graph, "threads", e->value, 0);
1027     } else {
1028         fg->graph->nb_threads = filter_complex_nbthreads;
1029     }
1030
1031     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1032         goto fail;
1033
1034     if (hw_device_ctx) {
1035         for (i = 0; i < fg->graph->nb_filters; i++) {
1036             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
1037         }
1038     }
1039
1040     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1041         const char *num_inputs;
1042         const char *num_outputs;
1043         if (!outputs) {
1044             num_outputs = "0";
1045         } else if (outputs->next) {
1046             num_outputs = ">1";
1047         } else {
1048             num_outputs = "1";
1049         }
1050         if (!inputs) {
1051             num_inputs = "0";
1052         } else if (inputs->next) {
1053             num_inputs = ">1";
1054         } else {
1055             num_inputs = "1";
1056         }
1057         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1058                "to have exactly 1 input and 1 output."
1059                " However, it had %s input(s) and %s output(s)."
1060                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1061                graph_desc, num_inputs, num_outputs);
1062         ret = AVERROR(EINVAL);
1063         goto fail;
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             goto fail;
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         goto fail;
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         AVFilterContext *sink = ofilter->filter;
1086
1087         ofilter->format = av_buffersink_get_format(sink);
1088
1089         ofilter->width  = av_buffersink_get_w(sink);
1090         ofilter->height = av_buffersink_get_h(sink);
1091
1092         ofilter->sample_rate    = av_buffersink_get_sample_rate(sink);
1093         ofilter->channel_layout = av_buffersink_get_channel_layout(sink);
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             ret = AVERROR(EINVAL);
1106             goto fail;
1107         }
1108         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1109             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1110             av_buffersink_set_frame_size(ost->filter->filter,
1111                                          ost->enc_ctx->frame_size);
1112     }
1113
1114     for (i = 0; i < fg->nb_inputs; i++) {
1115         while (av_fifo_size(fg->inputs[i]->frame_queue)) {
1116             AVFrame *tmp;
1117             av_fifo_generic_read(fg->inputs[i]->frame_queue, &tmp, sizeof(tmp), NULL);
1118             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, tmp);
1119             av_frame_free(&tmp);
1120             if (ret < 0)
1121                 goto fail;
1122         }
1123     }
1124
1125     /* send the EOFs for the finished inputs */
1126     for (i = 0; i < fg->nb_inputs; i++) {
1127         if (fg->inputs[i]->eof) {
1128             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, NULL);
1129             if (ret < 0)
1130                 goto fail;
1131         }
1132     }
1133
1134     /* process queued up subtitle packets */
1135     for (i = 0; i < fg->nb_inputs; i++) {
1136         InputStream *ist = fg->inputs[i]->ist;
1137         if (ist->sub2video.sub_queue && ist->sub2video.frame) {
1138             while (av_fifo_size(ist->sub2video.sub_queue)) {
1139                 AVSubtitle tmp;
1140                 av_fifo_generic_read(ist->sub2video.sub_queue, &tmp, sizeof(tmp), NULL);
1141                 sub2video_update(ist, &tmp);
1142                 avsubtitle_free(&tmp);
1143             }
1144         }
1145     }
1146
1147     return 0;
1148
1149 fail:
1150     cleanup_filtergraph(fg);
1151     return ret;
1152 }
1153
1154 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
1155 {
1156     av_buffer_unref(&ifilter->hw_frames_ctx);
1157
1158     ifilter->format = frame->format;
1159
1160     ifilter->width               = frame->width;
1161     ifilter->height              = frame->height;
1162     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
1163
1164     ifilter->sample_rate         = frame->sample_rate;
1165     ifilter->channels            = av_frame_get_channels(frame);
1166     ifilter->channel_layout      = frame->channel_layout;
1167
1168     if (frame->hw_frames_ctx) {
1169         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
1170         if (!ifilter->hw_frames_ctx)
1171             return AVERROR(ENOMEM);
1172     }
1173
1174     return 0;
1175 }
1176
1177 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1178 {
1179     int i;
1180     for (i = 0; i < fg->nb_inputs; i++)
1181         if (fg->inputs[i]->ist == ist)
1182             return 1;
1183     return 0;
1184 }
1185
1186 int filtergraph_is_simple(FilterGraph *fg)
1187 {
1188     return !fg->graph_desc;
1189 }