21b33432c4a05e30f7a47d942b584168c6f9cd73
[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     // Use with duration and without output starttime is buggy with trim filters
294     if (start_time == AV_NOPTS_VALUE)
295         return 0;
296
297     trim = avfilter_get_by_name(name);
298     if (!trim) {
299         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
300                "recording time.\n", name);
301         return AVERROR_FILTER_NOT_FOUND;
302     }
303
304     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
305     if (!ctx)
306         return AVERROR(ENOMEM);
307
308     if (duration != INT64_MAX) {
309         ret = av_opt_set_double(ctx, "duration", (double)duration / 1e6,
310                                 AV_OPT_SEARCH_CHILDREN);
311     }
312     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
313         ret = av_opt_set_double(ctx, "start", (double)start_time / 1e6,
314                                 AV_OPT_SEARCH_CHILDREN);
315     }
316     if (ret < 0) {
317         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
318         return ret;
319     }
320
321     ret = avfilter_init_str(ctx, NULL);
322     if (ret < 0)
323         return ret;
324
325     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
326     if (ret < 0)
327         return ret;
328
329     *last_filter = ctx;
330     *pad_idx     = 0;
331     return 0;
332 }
333
334 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
335 {
336     char *pix_fmts;
337     OutputStream *ost = ofilter->ost;
338     OutputFile    *of = output_files[ost->file_index];
339     AVCodecContext *codec = ost->st->codec;
340     AVFilterContext *last_filter = out->filter_ctx;
341     int pad_idx = out->pad_idx;
342     int ret;
343     char name[255];
344
345     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
346     ret = avfilter_graph_create_filter(&ofilter->filter,
347                                        avfilter_get_by_name("buffersink"),
348                                        name, NULL, NULL, fg->graph);
349
350     if (ret < 0)
351         return ret;
352
353     if (codec->width || codec->height) {
354         char args[255];
355         AVFilterContext *filter;
356
357         snprintf(args, sizeof(args), "%d:%d:0x%X",
358                  codec->width,
359                  codec->height,
360                  (unsigned)ost->sws_flags);
361         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
362                  ost->file_index, ost->index);
363         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
364                                                 name, args, NULL, fg->graph)) < 0)
365             return ret;
366         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
367             return ret;
368
369         last_filter = filter;
370         pad_idx = 0;
371     }
372
373     if ((pix_fmts = choose_pix_fmts(ost))) {
374         AVFilterContext *filter;
375         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
376                  ost->file_index, ost->index);
377         ret = avfilter_graph_create_filter(&filter,
378                                                 avfilter_get_by_name("format"),
379                                                 "format", pix_fmts, NULL,
380                                                 fg->graph);
381         av_freep(&pix_fmts);
382         if (ret < 0)
383             return ret;
384         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
385             return ret;
386
387         last_filter = filter;
388         pad_idx     = 0;
389     }
390
391     if (ost->frame_rate.num && 0) {
392         AVFilterContext *fps;
393         char args[255];
394
395         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
396                  ost->frame_rate.den);
397         snprintf(name, sizeof(name), "fps for output stream %d:%d",
398                  ost->file_index, ost->index);
399         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
400                                            name, args, NULL, fg->graph);
401         if (ret < 0)
402             return ret;
403
404         ret = avfilter_link(last_filter, pad_idx, fps, 0);
405         if (ret < 0)
406             return ret;
407         last_filter = fps;
408         pad_idx = 0;
409     }
410
411     snprintf(name, sizeof(name), "trim for output stream %d:%d",
412              ost->file_index, ost->index);
413     ret = insert_trim(of->start_time, of->recording_time,
414                       &last_filter, &pad_idx, name);
415     if (ret < 0)
416         return ret;
417
418
419     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
420         return ret;
421
422     return 0;
423 }
424
425 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
426 {
427     OutputStream *ost = ofilter->ost;
428     OutputFile    *of = output_files[ost->file_index];
429     AVCodecContext *codec  = ost->st->codec;
430     AVFilterContext *last_filter = out->filter_ctx;
431     int pad_idx = out->pad_idx;
432     char *sample_fmts, *sample_rates, *channel_layouts;
433     char name[255];
434     int ret;
435
436     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
437     ret = avfilter_graph_create_filter(&ofilter->filter,
438                                        avfilter_get_by_name("abuffersink"),
439                                        name, NULL, NULL, fg->graph);
440     if (ret < 0)
441         return ret;
442     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
443         return ret;
444
445 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
446     AVFilterContext *filt_ctx;                                              \
447                                                                             \
448     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
449            "similarly to -af " filter_name "=%s.\n", arg);                  \
450                                                                             \
451     ret = avfilter_graph_create_filter(&filt_ctx,                           \
452                                        avfilter_get_by_name(filter_name),   \
453                                        filter_name, arg, NULL, fg->graph);  \
454     if (ret < 0)                                                            \
455         return ret;                                                         \
456                                                                             \
457     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
458     if (ret < 0)                                                            \
459         return ret;                                                         \
460                                                                             \
461     last_filter = filt_ctx;                                                 \
462     pad_idx = 0;                                                            \
463 } while (0)
464     if (ost->audio_channels_mapped) {
465         int i;
466         AVBPrint pan_buf;
467         av_bprint_init(&pan_buf, 256, 8192);
468         av_bprintf(&pan_buf, "0x%"PRIx64,
469                    av_get_default_channel_layout(ost->audio_channels_mapped));
470         for (i = 0; i < ost->audio_channels_mapped; i++)
471             if (ost->audio_channels_map[i] != -1)
472                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
473
474         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
475         av_bprint_finalize(&pan_buf, NULL);
476     }
477
478     if (codec->channels && !codec->channel_layout)
479         codec->channel_layout = av_get_default_channel_layout(codec->channels);
480
481     sample_fmts     = choose_sample_fmts(ost);
482     sample_rates    = choose_sample_rates(ost);
483     channel_layouts = choose_channel_layouts(ost);
484     if (sample_fmts || sample_rates || channel_layouts) {
485         AVFilterContext *format;
486         char args[256];
487         args[0] = 0;
488
489         if (sample_fmts)
490             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
491                             sample_fmts);
492         if (sample_rates)
493             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
494                             sample_rates);
495         if (channel_layouts)
496             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
497                             channel_layouts);
498
499         av_freep(&sample_fmts);
500         av_freep(&sample_rates);
501         av_freep(&channel_layouts);
502
503         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
504                  ost->file_index, ost->index);
505         ret = avfilter_graph_create_filter(&format,
506                                            avfilter_get_by_name("aformat"),
507                                            name, args, NULL, fg->graph);
508         if (ret < 0)
509             return ret;
510
511         ret = avfilter_link(last_filter, pad_idx, format, 0);
512         if (ret < 0)
513             return ret;
514
515         last_filter = format;
516         pad_idx = 0;
517     }
518
519     if (audio_volume != 256 && 0) {
520         char args[256];
521
522         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
523         AUTO_INSERT_FILTER("-vol", "volume", args);
524     }
525
526     if (ost->apad && of->shortest) {
527         char args[256];
528         int i;
529
530         for (i=0; i<of->ctx->nb_streams; i++)
531             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
532                 break;
533
534         if (i<of->ctx->nb_streams) {
535             snprintf(args, sizeof(args), "%s", ost->apad);
536             AUTO_INSERT_FILTER("-apad", "apad", args);
537         }
538     }
539
540     snprintf(name, sizeof(name), "trim for output stream %d:%d",
541              ost->file_index, ost->index);
542     ret = insert_trim(of->start_time, of->recording_time,
543                       &last_filter, &pad_idx, name);
544     if (ret < 0)
545         return ret;
546
547     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
548         return ret;
549
550     return 0;
551 }
552
553 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
554 {                                                                  \
555     AVFilterContext *ctx = inout->filter_ctx;                      \
556     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
557     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
558     AVIOContext *pb;                                               \
559                                                                    \
560     if (avio_open_dyn_buf(&pb) < 0)                                \
561         exit_program(1);                                           \
562                                                                    \
563     avio_printf(pb, "%s", ctx->filter->name);                      \
564     if (nb_pads > 1)                                               \
565         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
566     avio_w8(pb, 0);                                                \
567     avio_close_dyn_buf(pb, &f->name);                              \
568 }
569
570 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
571 {
572     av_freep(&ofilter->name);
573     DESCRIBE_FILTER_LINK(ofilter, out, 0);
574
575     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
576     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
577     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
578     default: av_assert0(0);
579     }
580 }
581
582 static int sub2video_prepare(InputStream *ist)
583 {
584     AVFormatContext *avf = input_files[ist->file_index]->ctx;
585     int i, w, h;
586
587     /* Compute the size of the canvas for the subtitles stream.
588        If the subtitles codec has set a size, use it. Otherwise use the
589        maximum dimensions of the video streams in the same file. */
590     w = ist->st->codec->width;
591     h = ist->st->codec->height;
592     if (!(w && h)) {
593         for (i = 0; i < avf->nb_streams; i++) {
594             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
595                 w = FFMAX(w, avf->streams[i]->codec->width);
596                 h = FFMAX(h, avf->streams[i]->codec->height);
597             }
598         }
599         if (!(w && h)) {
600             w = FFMAX(w, 720);
601             h = FFMAX(h, 576);
602         }
603         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
604     }
605     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
606     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
607
608     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
609        palettes for all rectangles are identical or compatible */
610     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
611
612     ist->sub2video.frame = av_frame_alloc();
613     if (!ist->sub2video.frame)
614         return AVERROR(ENOMEM);
615     return 0;
616 }
617
618 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
619                                         AVFilterInOut *in)
620 {
621     AVFilterContext *last_filter;
622     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
623     InputStream *ist = ifilter->ist;
624     InputFile     *f = input_files[ist->file_index];
625     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
626                                          ist->st->time_base;
627     AVRational fr = ist->framerate;
628     AVRational sar;
629     AVBPrint args;
630     char name[255];
631     int ret, pad_idx = 0;
632
633     if (!fr.num)
634         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
635
636     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
637         ret = sub2video_prepare(ist);
638         if (ret < 0)
639             return ret;
640     }
641
642     sar = ist->st->sample_aspect_ratio.num ?
643           ist->st->sample_aspect_ratio :
644           ist->st->codec->sample_aspect_ratio;
645     if(!sar.den)
646         sar = (AVRational){0,1};
647     av_bprint_init(&args, 0, 1);
648     av_bprintf(&args,
649              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
650              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
651              ist->resample_height, ist->resample_pix_fmt,
652              tb.num, tb.den, sar.num, sar.den,
653              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
654     if (fr.num && fr.den)
655         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
656     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
657              ist->file_index, ist->st->index);
658
659     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
660                                             args.str, NULL, fg->graph)) < 0)
661         return ret;
662     last_filter = ifilter->filter;
663
664     if (ist->framerate.num) {
665         AVFilterContext *setpts;
666
667         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
668                  ist->file_index, ist->st->index);
669         if ((ret = avfilter_graph_create_filter(&setpts,
670                                                 avfilter_get_by_name("setpts"),
671                                                 name, "N", NULL,
672                                                 fg->graph)) < 0)
673             return ret;
674
675         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
676             return ret;
677
678         last_filter = setpts;
679     }
680
681     if (do_deinterlace) {
682         AVFilterContext *yadif;
683
684         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
685                  ist->file_index, ist->st->index);
686         if ((ret = avfilter_graph_create_filter(&yadif,
687                                                 avfilter_get_by_name("yadif"),
688                                                 name, "", NULL,
689                                                 fg->graph)) < 0)
690             return ret;
691
692         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
693             return ret;
694
695         last_filter = yadif;
696     }
697
698     snprintf(name, sizeof(name), "trim for input stream %d:%d",
699              ist->file_index, ist->st->index);
700     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
701                       AV_NOPTS_VALUE : 0, INT64_MAX, &last_filter, &pad_idx, name);
702     if (ret < 0)
703         return ret;
704
705     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
706         return ret;
707     return 0;
708 }
709
710 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
711                                         AVFilterInOut *in)
712 {
713     AVFilterContext *last_filter;
714     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
715     InputStream *ist = ifilter->ist;
716     InputFile     *f = input_files[ist->file_index];
717     AVBPrint args;
718     char name[255];
719     int ret, pad_idx = 0;
720
721     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
722     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
723              1, ist->st->codec->sample_rate,
724              ist->st->codec->sample_rate,
725              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
726     if (ist->st->codec->channel_layout)
727         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
728                    ist->st->codec->channel_layout);
729     else
730         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
731     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
732              ist->file_index, ist->st->index);
733
734     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
735                                             name, args.str, NULL,
736                                             fg->graph)) < 0)
737         return ret;
738     last_filter = ifilter->filter;
739
740 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
741     AVFilterContext *filt_ctx;                                              \
742                                                                             \
743     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
744            "similarly to -af " filter_name "=%s.\n", arg);                  \
745                                                                             \
746     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
747                 fg->index, filter_name, ist->file_index, ist->st->index);   \
748     ret = avfilter_graph_create_filter(&filt_ctx,                           \
749                                        avfilter_get_by_name(filter_name),   \
750                                        name, arg, NULL, fg->graph);         \
751     if (ret < 0)                                                            \
752         return ret;                                                         \
753                                                                             \
754     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
755     if (ret < 0)                                                            \
756         return ret;                                                         \
757                                                                             \
758     last_filter = filt_ctx;                                                 \
759 } while (0)
760
761     if (audio_sync_method > 0) {
762         char args[256] = {0};
763
764         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
765         if (audio_drift_threshold != 0.1)
766             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
767         if (!fg->reconfiguration)
768             av_strlcatf(args, sizeof(args), ":first_pts=0");
769         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
770     }
771
772 //     if (ost->audio_channels_mapped) {
773 //         int i;
774 //         AVBPrint pan_buf;
775 //         av_bprint_init(&pan_buf, 256, 8192);
776 //         av_bprintf(&pan_buf, "0x%"PRIx64,
777 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
778 //         for (i = 0; i < ost->audio_channels_mapped; i++)
779 //             if (ost->audio_channels_map[i] != -1)
780 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
781 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
782 //         av_bprint_finalize(&pan_buf, NULL);
783 //     }
784
785     if (audio_volume != 256) {
786         char args[256];
787
788         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
789                "audio filter instead.\n");
790
791         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
792         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
793     }
794
795     snprintf(name, sizeof(name), "trim for input stream %d:%d",
796              ist->file_index, ist->st->index);
797     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
798                       AV_NOPTS_VALUE : 0, INT64_MAX, &last_filter, &pad_idx, name);
799     if (ret < 0)
800         return ret;
801
802     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
803         return ret;
804
805     return 0;
806 }
807
808 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
809                                   AVFilterInOut *in)
810 {
811     av_freep(&ifilter->name);
812     DESCRIBE_FILTER_LINK(ifilter, in, 1);
813
814     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
815     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
816     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
817     default: av_assert0(0);
818     }
819 }
820
821 int configure_filtergraph(FilterGraph *fg)
822 {
823     AVFilterInOut *inputs, *outputs, *cur;
824     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
825     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
826                                       fg->graph_desc;
827
828     avfilter_graph_free(&fg->graph);
829     if (!(fg->graph = avfilter_graph_alloc()))
830         return AVERROR(ENOMEM);
831
832     if (simple) {
833         OutputStream *ost = fg->outputs[0]->ost;
834         char args[512];
835         AVDictionaryEntry *e = NULL;
836
837         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
838         fg->graph->scale_sws_opts = av_strdup(args);
839
840         args[0] = 0;
841         while ((e = av_dict_get(ost->swr_opts, "", e,
842                                 AV_DICT_IGNORE_SUFFIX))) {
843             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
844         }
845         if (strlen(args))
846             args[strlen(args)-1] = 0;
847         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
848
849         args[0] = '\0';
850         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
851                                 AV_DICT_IGNORE_SUFFIX))) {
852             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
853         }
854         if (strlen(args))
855             args[strlen(args) - 1] = '\0';
856         fg->graph->resample_lavr_opts = av_strdup(args);
857     }
858
859     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
860         return ret;
861
862     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
863         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
864                "exactly one input and output.\n", graph_desc);
865         return AVERROR(EINVAL);
866     }
867
868     for (cur = inputs; !simple && init && cur; cur = cur->next)
869         init_input_filter(fg, cur);
870
871     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
872         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
873             return ret;
874     avfilter_inout_free(&inputs);
875
876     if (!init || simple) {
877         /* we already know the mappings between lavfi outputs and output streams,
878          * so we can finish the setup */
879         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
880             configure_output_filter(fg, fg->outputs[i], cur);
881         avfilter_inout_free(&outputs);
882
883         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
884             return ret;
885     } else {
886         /* wait until output mappings are processed */
887         for (cur = outputs; cur;) {
888             GROW_ARRAY(fg->outputs, fg->nb_outputs);
889             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
890                 exit_program(1);
891             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
892             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
893             cur = cur->next;
894             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
895         }
896     }
897
898     fg->reconfiguration = 1;
899     return 0;
900 }
901
902 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
903 {
904     int i;
905     for (i = 0; i < fg->nb_inputs; i++)
906         if (fg->inputs[i]->ist == ist)
907             return 1;
908     return 0;
909 }
910