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