Merge commit '0f21d8b1b40848973558c737aebe800c46e93a3d'
[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 "ffmpeg.h"
22
23 #include "libavfilter/avfilter.h"
24 #include "libavfilter/buffersink.h"
25
26 #include "libavresample/avresample.h"
27
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/bprint.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/pixfmt.h"
35 #include "libavutil/imgutils.h"
36 #include "libavutil/samplefmt.h"
37
38 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
39 {
40     if (codec && codec->pix_fmts) {
41         const enum AVPixelFormat *p = codec->pix_fmts;
42         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
43         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
44         enum AVPixelFormat best= AV_PIX_FMT_NONE;
45         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
46             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
47                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
48             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
49                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
50                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
51             }
52         }
53         for (; *p != AV_PIX_FMT_NONE; p++) {
54             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
55             if (*p == target)
56                 break;
57         }
58         if (*p == AV_PIX_FMT_NONE) {
59             if (target != AV_PIX_FMT_NONE)
60                 av_log(NULL, AV_LOG_WARNING,
61                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
62                        av_get_pix_fmt_name(target),
63                        codec->name,
64                        av_get_pix_fmt_name(best));
65             return best;
66         }
67     }
68     return target;
69 }
70
71 void choose_sample_fmt(AVStream *st, AVCodec *codec)
72 {
73     if (codec && codec->sample_fmts) {
74         const enum AVSampleFormat *p = codec->sample_fmts;
75         for (; *p != -1; p++) {
76             if (*p == st->codec->sample_fmt)
77                 break;
78         }
79         if (*p == -1) {
80             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
81                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
82             if(av_get_sample_fmt_name(st->codec->sample_fmt))
83             av_log(NULL, AV_LOG_WARNING,
84                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
85                    av_get_sample_fmt_name(st->codec->sample_fmt),
86                    codec->name,
87                    av_get_sample_fmt_name(codec->sample_fmts[0]));
88             st->codec->sample_fmt = codec->sample_fmts[0];
89         }
90     }
91 }
92
93 static char *choose_pix_fmts(OutputStream *ost)
94 {
95     AVDictionaryEntry *strict_dict = av_dict_get(ost->opts, "strict", NULL, 0);
96     if (strict_dict)
97         // used by choose_pixel_fmt() and below
98         av_opt_set(ost->st->codec, "strict", strict_dict->value, 0);
99
100      if (ost->keep_pix_fmt) {
101         if (ost->filter)
102             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
103                                             AVFILTER_AUTO_CONVERT_NONE);
104         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
105             return NULL;
106         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
107     }
108     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
109         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
110     } else if (ost->enc && ost->enc->pix_fmts) {
111         const enum AVPixelFormat *p;
112         AVIOContext *s = NULL;
113         uint8_t *ret;
114         int len;
115
116         if (avio_open_dyn_buf(&s) < 0)
117             exit_program(1);
118
119         p = ost->enc->pix_fmts;
120         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
121             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
122                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
123             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
124                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
125                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
126             }
127         }
128
129         for (; *p != AV_PIX_FMT_NONE; p++) {
130             const char *name = av_get_pix_fmt_name(*p);
131             avio_printf(s, "%s|", name);
132         }
133         len = avio_close_dyn_buf(s, &ret);
134         ret[len - 1] = 0;
135         return ret;
136     } else
137         return NULL;
138 }
139
140 /* Define a function for building a string containing a list of
141  * allowed formats. */
142 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
143 static char *choose_ ## var ## s(OutputStream *ost)                            \
144 {                                                                              \
145     if (ost->st->codec->var != none) {                                         \
146         get_name(ost->st->codec->var);                                         \
147         return av_strdup(name);                                                \
148     } else if (ost->enc && ost->enc->supported_list) {                         \
149         const type *p;                                                         \
150         AVIOContext *s = NULL;                                                 \
151         uint8_t *ret;                                                          \
152         int len;                                                               \
153                                                                                \
154         if (avio_open_dyn_buf(&s) < 0)                                         \
155             exit_program(1);                                                           \
156                                                                                \
157         for (p = ost->enc->supported_list; *p != none; p++) {                  \
158             get_name(*p);                                                      \
159             avio_printf(s, "%s|", name);                                       \
160         }                                                                      \
161         len = avio_close_dyn_buf(s, &ret);                                     \
162         ret[len - 1] = 0;                                                      \
163         return ret;                                                            \
164     } else                                                                     \
165         return NULL;                                                           \
166 }
167
168 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
169 //                   GET_PIX_FMT_NAME)
170
171 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
172                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
173
174 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
175                   GET_SAMPLE_RATE_NAME)
176
177 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
178                   GET_CH_LAYOUT_NAME)
179
180 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
181 {
182     FilterGraph *fg = av_mallocz(sizeof(*fg));
183
184     if (!fg)
185         exit_program(1);
186     fg->index = nb_filtergraphs;
187
188     GROW_ARRAY(fg->outputs, fg->nb_outputs);
189     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
190         exit_program(1);
191     fg->outputs[0]->ost   = ost;
192     fg->outputs[0]->graph = fg;
193
194     ost->filter = fg->outputs[0];
195
196     GROW_ARRAY(fg->inputs, fg->nb_inputs);
197     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
198         exit_program(1);
199     fg->inputs[0]->ist   = ist;
200     fg->inputs[0]->graph = fg;
201
202     GROW_ARRAY(ist->filters, ist->nb_filters);
203     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
204
205     GROW_ARRAY(filtergraphs, nb_filtergraphs);
206     filtergraphs[nb_filtergraphs - 1] = fg;
207
208     return fg;
209 }
210
211 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
212 {
213     InputStream *ist = NULL;
214     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
215     int i;
216
217     // TODO: support other filter types
218     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
219         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
220                "currently.\n");
221         exit_program(1);
222     }
223
224     if (in->name) {
225         AVFormatContext *s;
226         AVStream       *st = NULL;
227         char *p;
228         int file_idx = strtol(in->name, &p, 0);
229
230         if (file_idx < 0 || file_idx >= nb_input_files) {
231             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
232                    file_idx, fg->graph_desc);
233             exit_program(1);
234         }
235         s = input_files[file_idx]->ctx;
236
237         for (i = 0; i < s->nb_streams; i++) {
238             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
239             if (stream_type != type &&
240                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
241                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
242                 continue;
243             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
244                 st = s->streams[i];
245                 break;
246             }
247         }
248         if (!st) {
249             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
250                    "matches no streams.\n", p, fg->graph_desc);
251             exit_program(1);
252         }
253         ist = input_streams[input_files[file_idx]->ist_index + st->index];
254     } else {
255         /* find the first unused stream of corresponding type */
256         for (i = 0; i < nb_input_streams; i++) {
257             ist = input_streams[i];
258             if (ist->st->codec->codec_type == type && ist->discard)
259                 break;
260         }
261         if (i == nb_input_streams) {
262             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
263                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
264                    in->filter_ctx->name);
265             exit_program(1);
266         }
267     }
268     av_assert0(ist);
269
270     ist->discard         = 0;
271     ist->decoding_needed++;
272     ist->st->discard = AVDISCARD_NONE;
273
274     GROW_ARRAY(fg->inputs, fg->nb_inputs);
275     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
276         exit_program(1);
277     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
278     fg->inputs[fg->nb_inputs - 1]->graph = fg;
279
280     GROW_ARRAY(ist->filters, ist->nb_filters);
281     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
282 }
283
284 static int insert_trim(int64_t start_time, int64_t duration,
285                        AVFilterContext **last_filter, int *pad_idx,
286                        const char *filter_name)
287 {
288     AVFilterGraph *graph = (*last_filter)->graph;
289     AVFilterContext *ctx;
290     const AVFilter *trim;
291     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
292     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
293     int ret = 0;
294
295     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
296         return 0;
297
298     trim = avfilter_get_by_name(name);
299     if (!trim) {
300         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
301                "recording time.\n", name);
302         return AVERROR_FILTER_NOT_FOUND;
303     }
304
305     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
306     if (!ctx)
307         return AVERROR(ENOMEM);
308
309     if (duration != INT64_MAX) {
310         ret = av_opt_set_int(ctx, "durationi", duration,
311                                 AV_OPT_SEARCH_CHILDREN);
312     }
313     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
314         ret = av_opt_set_int(ctx, "starti", start_time,
315                                 AV_OPT_SEARCH_CHILDREN);
316     }
317     if (ret < 0) {
318         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
319         return ret;
320     }
321
322     ret = avfilter_init_str(ctx, NULL);
323     if (ret < 0)
324         return ret;
325
326     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
327     if (ret < 0)
328         return ret;
329
330     *last_filter = ctx;
331     *pad_idx     = 0;
332     return 0;
333 }
334
335 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
336 {
337     char *pix_fmts;
338     OutputStream *ost = ofilter->ost;
339     OutputFile    *of = output_files[ost->file_index];
340     AVCodecContext *codec = ost->st->codec;
341     AVFilterContext *last_filter = out->filter_ctx;
342     int pad_idx = out->pad_idx;
343     int ret;
344     char name[255];
345
346     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
347     ret = avfilter_graph_create_filter(&ofilter->filter,
348                                        avfilter_get_by_name("buffersink"),
349                                        name, NULL, NULL, fg->graph);
350
351     if (ret < 0)
352         return ret;
353
354     if (codec->width || codec->height) {
355         char args[255];
356         AVFilterContext *filter;
357
358         snprintf(args, sizeof(args), "%d:%d:0x%X",
359                  codec->width,
360                  codec->height,
361                  (unsigned)ost->sws_flags);
362         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
363                  ost->file_index, ost->index);
364         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
365                                                 name, args, NULL, fg->graph)) < 0)
366             return ret;
367         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
368             return ret;
369
370         last_filter = filter;
371         pad_idx = 0;
372     }
373
374     if ((pix_fmts = choose_pix_fmts(ost))) {
375         AVFilterContext *filter;
376         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
377                  ost->file_index, ost->index);
378         ret = avfilter_graph_create_filter(&filter,
379                                                 avfilter_get_by_name("format"),
380                                                 "format", pix_fmts, NULL,
381                                                 fg->graph);
382         av_freep(&pix_fmts);
383         if (ret < 0)
384             return ret;
385         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
386             return ret;
387
388         last_filter = filter;
389         pad_idx     = 0;
390     }
391
392     if (ost->frame_rate.num && 0) {
393         AVFilterContext *fps;
394         char args[255];
395
396         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
397                  ost->frame_rate.den);
398         snprintf(name, sizeof(name), "fps for output stream %d:%d",
399                  ost->file_index, ost->index);
400         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
401                                            name, args, NULL, fg->graph);
402         if (ret < 0)
403             return ret;
404
405         ret = avfilter_link(last_filter, pad_idx, fps, 0);
406         if (ret < 0)
407             return ret;
408         last_filter = fps;
409         pad_idx = 0;
410     }
411
412     snprintf(name, sizeof(name), "trim for output stream %d:%d",
413              ost->file_index, ost->index);
414     ret = insert_trim(of->start_time, of->recording_time,
415                       &last_filter, &pad_idx, name);
416     if (ret < 0)
417         return ret;
418
419
420     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
421         return ret;
422
423     return 0;
424 }
425
426 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
427 {
428     OutputStream *ost = ofilter->ost;
429     OutputFile    *of = output_files[ost->file_index];
430     AVCodecContext *codec  = ost->st->codec;
431     AVFilterContext *last_filter = out->filter_ctx;
432     int pad_idx = out->pad_idx;
433     char *sample_fmts, *sample_rates, *channel_layouts;
434     char name[255];
435     int ret;
436
437     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
438     ret = avfilter_graph_create_filter(&ofilter->filter,
439                                        avfilter_get_by_name("abuffersink"),
440                                        name, NULL, NULL, fg->graph);
441     if (ret < 0)
442         return ret;
443     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
444         return ret;
445
446 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
447     AVFilterContext *filt_ctx;                                              \
448                                                                             \
449     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
450            "similarly to -af " filter_name "=%s.\n", arg);                  \
451                                                                             \
452     ret = avfilter_graph_create_filter(&filt_ctx,                           \
453                                        avfilter_get_by_name(filter_name),   \
454                                        filter_name, arg, NULL, fg->graph);  \
455     if (ret < 0)                                                            \
456         return ret;                                                         \
457                                                                             \
458     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
459     if (ret < 0)                                                            \
460         return ret;                                                         \
461                                                                             \
462     last_filter = filt_ctx;                                                 \
463     pad_idx = 0;                                                            \
464 } while (0)
465     if (ost->audio_channels_mapped) {
466         int i;
467         AVBPrint pan_buf;
468         av_bprint_init(&pan_buf, 256, 8192);
469         av_bprintf(&pan_buf, "0x%"PRIx64,
470                    av_get_default_channel_layout(ost->audio_channels_mapped));
471         for (i = 0; i < ost->audio_channels_mapped; i++)
472             if (ost->audio_channels_map[i] != -1)
473                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
474
475         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
476         av_bprint_finalize(&pan_buf, NULL);
477     }
478
479     if (codec->channels && !codec->channel_layout)
480         codec->channel_layout = av_get_default_channel_layout(codec->channels);
481
482     sample_fmts     = choose_sample_fmts(ost);
483     sample_rates    = choose_sample_rates(ost);
484     channel_layouts = choose_channel_layouts(ost);
485     if (sample_fmts || sample_rates || channel_layouts) {
486         AVFilterContext *format;
487         char args[256];
488         args[0] = 0;
489
490         if (sample_fmts)
491             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
492                             sample_fmts);
493         if (sample_rates)
494             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
495                             sample_rates);
496         if (channel_layouts)
497             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
498                             channel_layouts);
499
500         av_freep(&sample_fmts);
501         av_freep(&sample_rates);
502         av_freep(&channel_layouts);
503
504         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
505                  ost->file_index, ost->index);
506         ret = avfilter_graph_create_filter(&format,
507                                            avfilter_get_by_name("aformat"),
508                                            name, args, NULL, fg->graph);
509         if (ret < 0)
510             return ret;
511
512         ret = avfilter_link(last_filter, pad_idx, format, 0);
513         if (ret < 0)
514             return ret;
515
516         last_filter = format;
517         pad_idx = 0;
518     }
519
520     if (audio_volume != 256 && 0) {
521         char args[256];
522
523         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
524         AUTO_INSERT_FILTER("-vol", "volume", args);
525     }
526
527     if (ost->apad && of->shortest) {
528         char args[256];
529         int i;
530
531         for (i=0; i<of->ctx->nb_streams; i++)
532             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
533                 break;
534
535         if (i<of->ctx->nb_streams) {
536             snprintf(args, sizeof(args), "%s", ost->apad);
537             AUTO_INSERT_FILTER("-apad", "apad", args);
538         }
539     }
540
541     snprintf(name, sizeof(name), "trim for output stream %d:%d",
542              ost->file_index, ost->index);
543     ret = insert_trim(of->start_time, of->recording_time,
544                       &last_filter, &pad_idx, name);
545     if (ret < 0)
546         return ret;
547
548     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
549         return ret;
550
551     return 0;
552 }
553
554 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
555 {                                                                  \
556     AVFilterContext *ctx = inout->filter_ctx;                      \
557     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
558     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
559     AVIOContext *pb;                                               \
560                                                                    \
561     if (avio_open_dyn_buf(&pb) < 0)                                \
562         exit_program(1);                                           \
563                                                                    \
564     avio_printf(pb, "%s", ctx->filter->name);                      \
565     if (nb_pads > 1)                                               \
566         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
567     avio_w8(pb, 0);                                                \
568     avio_close_dyn_buf(pb, &f->name);                              \
569 }
570
571 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
572 {
573     av_freep(&ofilter->name);
574     DESCRIBE_FILTER_LINK(ofilter, out, 0);
575
576     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
577     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
578     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
579     default: av_assert0(0);
580     }
581 }
582
583 static int sub2video_prepare(InputStream *ist)
584 {
585     AVFormatContext *avf = input_files[ist->file_index]->ctx;
586     int i, w, h;
587
588     /* Compute the size of the canvas for the subtitles stream.
589        If the subtitles codec has set a size, use it. Otherwise use the
590        maximum dimensions of the video streams in the same file. */
591     w = ist->st->codec->width;
592     h = ist->st->codec->height;
593     if (!(w && h)) {
594         for (i = 0; i < avf->nb_streams; i++) {
595             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
596                 w = FFMAX(w, avf->streams[i]->codec->width);
597                 h = FFMAX(h, avf->streams[i]->codec->height);
598             }
599         }
600         if (!(w && h)) {
601             w = FFMAX(w, 720);
602             h = FFMAX(h, 576);
603         }
604         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
605     }
606     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
607     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
608
609     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
610        palettes for all rectangles are identical or compatible */
611     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
612
613     ist->sub2video.frame = av_frame_alloc();
614     if (!ist->sub2video.frame)
615         return AVERROR(ENOMEM);
616     return 0;
617 }
618
619 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
620                                         AVFilterInOut *in)
621 {
622     AVFilterContext *last_filter;
623     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
624     InputStream *ist = ifilter->ist;
625     InputFile     *f = input_files[ist->file_index];
626     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
627                                          ist->st->time_base;
628     AVRational fr = ist->framerate;
629     AVRational sar;
630     AVBPrint args;
631     char name[255];
632     int ret, pad_idx = 0;
633
634     if (ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
635         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
636         return AVERROR(EINVAL);
637     }
638
639     if (!fr.num)
640         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
641
642     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
643         ret = sub2video_prepare(ist);
644         if (ret < 0)
645             return ret;
646     }
647
648     sar = ist->st->sample_aspect_ratio.num ?
649           ist->st->sample_aspect_ratio :
650           ist->st->codec->sample_aspect_ratio;
651     if(!sar.den)
652         sar = (AVRational){0,1};
653     av_bprint_init(&args, 0, 1);
654     av_bprintf(&args,
655              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
656              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
657              ist->resample_height, ist->resample_pix_fmt,
658              tb.num, tb.den, sar.num, sar.den,
659              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
660     if (fr.num && fr.den)
661         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
662     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
663              ist->file_index, ist->st->index);
664
665     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
666                                             args.str, NULL, fg->graph)) < 0)
667         return ret;
668     last_filter = ifilter->filter;
669
670     if (ist->framerate.num) {
671         AVFilterContext *setpts;
672
673         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
674                  ist->file_index, ist->st->index);
675         if ((ret = avfilter_graph_create_filter(&setpts,
676                                                 avfilter_get_by_name("setpts"),
677                                                 name, "N", NULL,
678                                                 fg->graph)) < 0)
679             return ret;
680
681         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
682             return ret;
683
684         last_filter = setpts;
685     }
686
687     if (do_deinterlace) {
688         AVFilterContext *yadif;
689
690         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
691                  ist->file_index, ist->st->index);
692         if ((ret = avfilter_graph_create_filter(&yadif,
693                                                 avfilter_get_by_name("yadif"),
694                                                 name, "", NULL,
695                                                 fg->graph)) < 0)
696             return ret;
697
698         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
699             return ret;
700
701         last_filter = yadif;
702     }
703
704     snprintf(name, sizeof(name), "trim for input stream %d:%d",
705              ist->file_index, ist->st->index);
706     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
707                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
708     if (ret < 0)
709         return ret;
710
711     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
712         return ret;
713     return 0;
714 }
715
716 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
717                                         AVFilterInOut *in)
718 {
719     AVFilterContext *last_filter;
720     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
721     InputStream *ist = ifilter->ist;
722     InputFile     *f = input_files[ist->file_index];
723     AVBPrint args;
724     char name[255];
725     int ret, pad_idx = 0;
726
727     if (ist->st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
728         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
729         return AVERROR(EINVAL);
730     }
731
732     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
733     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
734              1, ist->st->codec->sample_rate,
735              ist->st->codec->sample_rate,
736              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
737     if (ist->st->codec->channel_layout)
738         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
739                    ist->st->codec->channel_layout);
740     else
741         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
742     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
743              ist->file_index, ist->st->index);
744
745     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
746                                             name, args.str, NULL,
747                                             fg->graph)) < 0)
748         return ret;
749     last_filter = ifilter->filter;
750
751 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
752     AVFilterContext *filt_ctx;                                              \
753                                                                             \
754     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
755            "similarly to -af " filter_name "=%s.\n", arg);                  \
756                                                                             \
757     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
758                 fg->index, filter_name, ist->file_index, ist->st->index);   \
759     ret = avfilter_graph_create_filter(&filt_ctx,                           \
760                                        avfilter_get_by_name(filter_name),   \
761                                        name, arg, NULL, fg->graph);         \
762     if (ret < 0)                                                            \
763         return ret;                                                         \
764                                                                             \
765     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
766     if (ret < 0)                                                            \
767         return ret;                                                         \
768                                                                             \
769     last_filter = filt_ctx;                                                 \
770 } while (0)
771
772     if (audio_sync_method > 0) {
773         char args[256] = {0};
774
775         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
776         if (audio_drift_threshold != 0.1)
777             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
778         if (!fg->reconfiguration)
779             av_strlcatf(args, sizeof(args), ":first_pts=0");
780         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
781     }
782
783 //     if (ost->audio_channels_mapped) {
784 //         int i;
785 //         AVBPrint pan_buf;
786 //         av_bprint_init(&pan_buf, 256, 8192);
787 //         av_bprintf(&pan_buf, "0x%"PRIx64,
788 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
789 //         for (i = 0; i < ost->audio_channels_mapped; i++)
790 //             if (ost->audio_channels_map[i] != -1)
791 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
792 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
793 //         av_bprint_finalize(&pan_buf, NULL);
794 //     }
795
796     if (audio_volume != 256) {
797         char args[256];
798
799         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
800                "audio filter instead.\n");
801
802         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
803         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
804     }
805
806     snprintf(name, sizeof(name), "trim for input stream %d:%d",
807              ist->file_index, ist->st->index);
808     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
809                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
810     if (ret < 0)
811         return ret;
812
813     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
814         return ret;
815
816     return 0;
817 }
818
819 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
820                                   AVFilterInOut *in)
821 {
822     av_freep(&ifilter->name);
823     DESCRIBE_FILTER_LINK(ifilter, in, 1);
824
825     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
826     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
827     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
828     default: av_assert0(0);
829     }
830 }
831
832 int configure_filtergraph(FilterGraph *fg)
833 {
834     AVFilterInOut *inputs, *outputs, *cur;
835     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
836     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
837                                       fg->graph_desc;
838
839     avfilter_graph_free(&fg->graph);
840     if (!(fg->graph = avfilter_graph_alloc()))
841         return AVERROR(ENOMEM);
842
843     if (simple) {
844         OutputStream *ost = fg->outputs[0]->ost;
845         char args[512];
846         AVDictionaryEntry *e = NULL;
847
848         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
849         fg->graph->scale_sws_opts = av_strdup(args);
850
851         args[0] = 0;
852         while ((e = av_dict_get(ost->swr_opts, "", e,
853                                 AV_DICT_IGNORE_SUFFIX))) {
854             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
855         }
856         if (strlen(args))
857             args[strlen(args)-1] = 0;
858         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
859
860         args[0] = '\0';
861         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
862                                 AV_DICT_IGNORE_SUFFIX))) {
863             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
864         }
865         if (strlen(args))
866             args[strlen(args) - 1] = '\0';
867         fg->graph->resample_lavr_opts = av_strdup(args);
868
869         e = av_dict_get(ost->opts, "threads", NULL, 0);
870         if (e)
871             av_opt_set(fg->graph, "threads", e->value, 0);
872     }
873
874     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
875         return ret;
876
877     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
878         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
879                "exactly one input and output.\n", graph_desc);
880         return AVERROR(EINVAL);
881     }
882
883     for (cur = inputs; !simple && init && cur; cur = cur->next)
884         init_input_filter(fg, cur);
885
886     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
887         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
888             return ret;
889     avfilter_inout_free(&inputs);
890
891     if (!init || simple) {
892         /* we already know the mappings between lavfi outputs and output streams,
893          * so we can finish the setup */
894         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
895             configure_output_filter(fg, fg->outputs[i], cur);
896         avfilter_inout_free(&outputs);
897
898         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
899             return ret;
900     } else {
901         /* wait until output mappings are processed */
902         for (cur = outputs; cur;) {
903             GROW_ARRAY(fg->outputs, fg->nb_outputs);
904             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
905                 exit_program(1);
906             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
907             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
908             cur = cur->next;
909             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
910         }
911     }
912
913     fg->reconfiguration = 1;
914     return 0;
915 }
916
917 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
918 {
919     int i;
920     for (i = 0; i < fg->nb_inputs; i++)
921         if (fg->inputs[i]->ist == ist)
922             return 1;
923     return 0;
924 }
925