bf484bb8590c85c58db1c1b0ee6f87463778c502
[ffmpeg.git] / ffmpeg_filter.c
1 /*
2  * ffmpeg filter configuration
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 #include <stdint.h>
22
23 #include "ffmpeg.h"
24
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/buffersink.h"
27
28 #include "libavresample/avresample.h"
29
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/bprint.h"
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/display.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavutil/pixfmt.h"
38 #include "libavutil/imgutils.h"
39 #include "libavutil/samplefmt.h"
40
41 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
42 {
43     if (codec && codec->pix_fmts) {
44         const enum AVPixelFormat *p = codec->pix_fmts;
45         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
46         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
47         enum AVPixelFormat best= AV_PIX_FMT_NONE;
48         static const enum AVPixelFormat mjpeg_formats[] =
49             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
50         static const enum AVPixelFormat ljpeg_formats[] =
51             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
52               AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
53
54         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
55             if (enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
56                 p = mjpeg_formats;
57             } else if (enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
58                 p =ljpeg_formats;
59             }
60         }
61         for (; *p != AV_PIX_FMT_NONE; p++) {
62             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
63             if (*p == target)
64                 break;
65         }
66         if (*p == AV_PIX_FMT_NONE) {
67             if (target != AV_PIX_FMT_NONE)
68                 av_log(NULL, AV_LOG_WARNING,
69                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
70                        av_get_pix_fmt_name(target),
71                        codec->name,
72                        av_get_pix_fmt_name(best));
73             return best;
74         }
75     }
76     return target;
77 }
78
79 void choose_sample_fmt(AVStream *st, AVCodec *codec)
80 {
81     if (codec && codec->sample_fmts) {
82         const enum AVSampleFormat *p = codec->sample_fmts;
83         for (; *p != -1; p++) {
84             if (*p == st->codec->sample_fmt)
85                 break;
86         }
87         if (*p == -1) {
88             if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
89                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
90             if(av_get_sample_fmt_name(st->codec->sample_fmt))
91             av_log(NULL, AV_LOG_WARNING,
92                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
93                    av_get_sample_fmt_name(st->codec->sample_fmt),
94                    codec->name,
95                    av_get_sample_fmt_name(codec->sample_fmts[0]));
96             st->codec->sample_fmt = codec->sample_fmts[0];
97         }
98     }
99 }
100
101 static char *choose_pix_fmts(OutputStream *ost)
102 {
103     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
104     if (strict_dict)
105         // used by choose_pixel_fmt() and below
106         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
107
108      if (ost->keep_pix_fmt) {
109         if (ost->filter)
110             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
111                                             AVFILTER_AUTO_CONVERT_NONE);
112         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
113             return NULL;
114         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
115     }
116     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
117         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
118     } else if (ost->enc && ost->enc->pix_fmts) {
119         const enum AVPixelFormat *p;
120         AVIOContext *s = NULL;
121         uint8_t *ret;
122         int len;
123
124         if (avio_open_dyn_buf(&s) < 0)
125             exit_program(1);
126
127         p = ost->enc->pix_fmts;
128         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
129             if (ost->enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
130                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
131             } else if (ost->enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
132                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
133                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
134             }
135         }
136
137         for (; *p != AV_PIX_FMT_NONE; p++) {
138             const char *name = av_get_pix_fmt_name(*p);
139             avio_printf(s, "%s|", name);
140         }
141         len = avio_close_dyn_buf(s, &ret);
142         ret[len - 1] = 0;
143         return ret;
144     } else
145         return NULL;
146 }
147
148 /* Define a function for building a string containing a list of
149  * allowed formats. */
150 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
151 static char *choose_ ## var ## s(OutputStream *ost)                            \
152 {                                                                              \
153     if (ost->enc_ctx->var != none) {                                           \
154         get_name(ost->enc_ctx->var);                                           \
155         return av_strdup(name);                                                \
156     } else if (ost->enc && ost->enc->supported_list) {                         \
157         const type *p;                                                         \
158         AVIOContext *s = NULL;                                                 \
159         uint8_t *ret;                                                          \
160         int len;                                                               \
161                                                                                \
162         if (avio_open_dyn_buf(&s) < 0)                                         \
163             exit_program(1);                                                           \
164                                                                                \
165         for (p = ost->enc->supported_list; *p != none; p++) {                  \
166             get_name(*p);                                                      \
167             avio_printf(s, "%s|", name);                                       \
168         }                                                                      \
169         len = avio_close_dyn_buf(s, &ret);                                     \
170         ret[len - 1] = 0;                                                      \
171         return ret;                                                            \
172     } else                                                                     \
173         return NULL;                                                           \
174 }
175
176 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
177 //                   GET_PIX_FMT_NAME)
178
179 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
180                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
181
182 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
183                   GET_SAMPLE_RATE_NAME)
184
185 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
186                   GET_CH_LAYOUT_NAME)
187
188 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
189 {
190     FilterGraph *fg = av_mallocz(sizeof(*fg));
191
192     if (!fg)
193         exit_program(1);
194     fg->index = nb_filtergraphs;
195
196     GROW_ARRAY(fg->outputs, fg->nb_outputs);
197     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
198         exit_program(1);
199     fg->outputs[0]->ost   = ost;
200     fg->outputs[0]->graph = fg;
201
202     ost->filter = fg->outputs[0];
203
204     GROW_ARRAY(fg->inputs, fg->nb_inputs);
205     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
206         exit_program(1);
207     fg->inputs[0]->ist   = ist;
208     fg->inputs[0]->graph = fg;
209
210     GROW_ARRAY(ist->filters, ist->nb_filters);
211     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
212
213     GROW_ARRAY(filtergraphs, nb_filtergraphs);
214     filtergraphs[nb_filtergraphs - 1] = fg;
215
216     return fg;
217 }
218
219 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
220 {
221     InputStream *ist = NULL;
222     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
223     int i;
224
225     // TODO: support other filter types
226     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
227         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
228                "currently.\n");
229         exit_program(1);
230     }
231
232     if (in->name) {
233         AVFormatContext *s;
234         AVStream       *st = NULL;
235         char *p;
236         int file_idx = strtol(in->name, &p, 0);
237
238         if (file_idx < 0 || file_idx >= nb_input_files) {
239             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
240                    file_idx, fg->graph_desc);
241             exit_program(1);
242         }
243         s = input_files[file_idx]->ctx;
244
245         for (i = 0; i < s->nb_streams; i++) {
246             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
247             if (stream_type != type &&
248                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
249                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
250                 continue;
251             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
252                 st = s->streams[i];
253                 break;
254             }
255         }
256         if (!st) {
257             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
258                    "matches no streams.\n", p, fg->graph_desc);
259             exit_program(1);
260         }
261         ist = input_streams[input_files[file_idx]->ist_index + st->index];
262     } else {
263         /* find the first unused stream of corresponding type */
264         for (i = 0; i < nb_input_streams; i++) {
265             ist = input_streams[i];
266             if (ist->dec_ctx->codec_type == type && ist->discard)
267                 break;
268         }
269         if (i == nb_input_streams) {
270             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
271                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
272                    in->filter_ctx->name);
273             exit_program(1);
274         }
275     }
276     av_assert0(ist);
277
278     ist->discard         = 0;
279     ist->decoding_needed |= DECODING_FOR_FILTER;
280     ist->st->discard = AVDISCARD_NONE;
281
282     GROW_ARRAY(fg->inputs, fg->nb_inputs);
283     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
284         exit_program(1);
285     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
286     fg->inputs[fg->nb_inputs - 1]->graph = fg;
287
288     GROW_ARRAY(ist->filters, ist->nb_filters);
289     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
290 }
291
292 int init_complex_filtergraph(FilterGraph *fg)
293 {
294     AVFilterInOut *inputs, *outputs, *cur;
295     AVFilterGraph *graph;
296     int ret = 0;
297
298     /* this graph is only used for determining the kinds of inputs
299      * and outputs we have, and is discarded on exit from this function */
300     graph = avfilter_graph_alloc();
301     if (!graph)
302         return AVERROR(ENOMEM);
303
304     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
305     if (ret < 0)
306         goto fail;
307
308     for (cur = inputs; cur; cur = cur->next)
309         init_input_filter(fg, cur);
310
311     for (cur = outputs; cur;) {
312         GROW_ARRAY(fg->outputs, fg->nb_outputs);
313         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
314         if (!fg->outputs[fg->nb_outputs - 1])
315             exit_program(1);
316
317         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
318         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
319         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
320                                                                          cur->pad_idx);
321         cur = cur->next;
322         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
323     }
324
325 fail:
326     avfilter_inout_free(&inputs);
327     avfilter_graph_free(&graph);
328     return ret;
329 }
330
331 static int insert_trim(int64_t start_time, int64_t duration,
332                        AVFilterContext **last_filter, int *pad_idx,
333                        const char *filter_name)
334 {
335     AVFilterGraph *graph = (*last_filter)->graph;
336     AVFilterContext *ctx;
337     const AVFilter *trim;
338     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
339     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
340     int ret = 0;
341
342     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
343         return 0;
344
345     trim = avfilter_get_by_name(name);
346     if (!trim) {
347         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
348                "recording time.\n", name);
349         return AVERROR_FILTER_NOT_FOUND;
350     }
351
352     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
353     if (!ctx)
354         return AVERROR(ENOMEM);
355
356     if (duration != INT64_MAX) {
357         ret = av_opt_set_int(ctx, "durationi", duration,
358                                 AV_OPT_SEARCH_CHILDREN);
359     }
360     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
361         ret = av_opt_set_int(ctx, "starti", start_time,
362                                 AV_OPT_SEARCH_CHILDREN);
363     }
364     if (ret < 0) {
365         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
366         return ret;
367     }
368
369     ret = avfilter_init_str(ctx, NULL);
370     if (ret < 0)
371         return ret;
372
373     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
374     if (ret < 0)
375         return ret;
376
377     *last_filter = ctx;
378     *pad_idx     = 0;
379     return 0;
380 }
381
382 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
383                          const char *filter_name, const char *args)
384 {
385     AVFilterGraph *graph = (*last_filter)->graph;
386     AVFilterContext *ctx;
387     int ret;
388
389     ret = avfilter_graph_create_filter(&ctx,
390                                        avfilter_get_by_name(filter_name),
391                                        filter_name, args, NULL, graph);
392     if (ret < 0)
393         return ret;
394
395     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
396     if (ret < 0)
397         return ret;
398
399     *last_filter = ctx;
400     *pad_idx     = 0;
401     return 0;
402 }
403
404 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
405 {
406     char *pix_fmts;
407     OutputStream *ost = ofilter->ost;
408     OutputFile    *of = output_files[ost->file_index];
409     AVCodecContext *codec = ost->enc_ctx;
410     AVFilterContext *last_filter = out->filter_ctx;
411     int pad_idx = out->pad_idx;
412     int ret;
413     char name[255];
414
415     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
416     ret = avfilter_graph_create_filter(&ofilter->filter,
417                                        avfilter_get_by_name("buffersink"),
418                                        name, NULL, NULL, fg->graph);
419
420     if (ret < 0)
421         return ret;
422
423     if (codec->width || codec->height) {
424         char args[255];
425         AVFilterContext *filter;
426         AVDictionaryEntry *e = NULL;
427
428         snprintf(args, sizeof(args), "%d:%d",
429                  codec->width,
430                  codec->height);
431
432         while ((e = av_dict_get(ost->sws_dict, "", e,
433                                 AV_DICT_IGNORE_SUFFIX))) {
434             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
435         }
436
437         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
438                  ost->file_index, ost->index);
439         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
440                                                 name, args, NULL, fg->graph)) < 0)
441             return ret;
442         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
443             return ret;
444
445         last_filter = filter;
446         pad_idx = 0;
447     }
448
449     if ((pix_fmts = choose_pix_fmts(ost))) {
450         AVFilterContext *filter;
451         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
452                  ost->file_index, ost->index);
453         ret = avfilter_graph_create_filter(&filter,
454                                            avfilter_get_by_name("format"),
455                                            "format", pix_fmts, NULL, fg->graph);
456         av_freep(&pix_fmts);
457         if (ret < 0)
458             return ret;
459         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
460             return ret;
461
462         last_filter = filter;
463         pad_idx     = 0;
464     }
465
466     if (ost->frame_rate.num && 0) {
467         AVFilterContext *fps;
468         char args[255];
469
470         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
471                  ost->frame_rate.den);
472         snprintf(name, sizeof(name), "fps for output stream %d:%d",
473                  ost->file_index, ost->index);
474         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
475                                            name, args, NULL, fg->graph);
476         if (ret < 0)
477             return ret;
478
479         ret = avfilter_link(last_filter, pad_idx, fps, 0);
480         if (ret < 0)
481             return ret;
482         last_filter = fps;
483         pad_idx = 0;
484     }
485
486     snprintf(name, sizeof(name), "trim for output stream %d:%d",
487              ost->file_index, ost->index);
488     ret = insert_trim(of->start_time, of->recording_time,
489                       &last_filter, &pad_idx, name);
490     if (ret < 0)
491         return ret;
492
493
494     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
495         return ret;
496
497     return 0;
498 }
499
500 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
501 {
502     OutputStream *ost = ofilter->ost;
503     OutputFile    *of = output_files[ost->file_index];
504     AVCodecContext *codec  = ost->enc_ctx;
505     AVFilterContext *last_filter = out->filter_ctx;
506     int pad_idx = out->pad_idx;
507     char *sample_fmts, *sample_rates, *channel_layouts;
508     char name[255];
509     int ret;
510
511     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
512     ret = avfilter_graph_create_filter(&ofilter->filter,
513                                        avfilter_get_by_name("abuffersink"),
514                                        name, NULL, NULL, fg->graph);
515     if (ret < 0)
516         return ret;
517     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
518         return ret;
519
520 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
521     AVFilterContext *filt_ctx;                                              \
522                                                                             \
523     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
524            "similarly to -af " filter_name "=%s.\n", arg);                  \
525                                                                             \
526     ret = avfilter_graph_create_filter(&filt_ctx,                           \
527                                        avfilter_get_by_name(filter_name),   \
528                                        filter_name, arg, NULL, fg->graph);  \
529     if (ret < 0)                                                            \
530         return ret;                                                         \
531                                                                             \
532     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
533     if (ret < 0)                                                            \
534         return ret;                                                         \
535                                                                             \
536     last_filter = filt_ctx;                                                 \
537     pad_idx = 0;                                                            \
538 } while (0)
539     if (ost->audio_channels_mapped) {
540         int i;
541         AVBPrint pan_buf;
542         av_bprint_init(&pan_buf, 256, 8192);
543         av_bprintf(&pan_buf, "0x%"PRIx64,
544                    av_get_default_channel_layout(ost->audio_channels_mapped));
545         for (i = 0; i < ost->audio_channels_mapped; i++)
546             if (ost->audio_channels_map[i] != -1)
547                 av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
548
549         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
550         av_bprint_finalize(&pan_buf, NULL);
551     }
552
553     if (codec->channels && !codec->channel_layout)
554         codec->channel_layout = av_get_default_channel_layout(codec->channels);
555
556     sample_fmts     = choose_sample_fmts(ost);
557     sample_rates    = choose_sample_rates(ost);
558     channel_layouts = choose_channel_layouts(ost);
559     if (sample_fmts || sample_rates || channel_layouts) {
560         AVFilterContext *format;
561         char args[256];
562         args[0] = 0;
563
564         if (sample_fmts)
565             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
566                             sample_fmts);
567         if (sample_rates)
568             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
569                             sample_rates);
570         if (channel_layouts)
571             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
572                             channel_layouts);
573
574         av_freep(&sample_fmts);
575         av_freep(&sample_rates);
576         av_freep(&channel_layouts);
577
578         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
579                  ost->file_index, ost->index);
580         ret = avfilter_graph_create_filter(&format,
581                                            avfilter_get_by_name("aformat"),
582                                            name, args, NULL, fg->graph);
583         if (ret < 0)
584             return ret;
585
586         ret = avfilter_link(last_filter, pad_idx, format, 0);
587         if (ret < 0)
588             return ret;
589
590         last_filter = format;
591         pad_idx = 0;
592     }
593
594     if (audio_volume != 256 && 0) {
595         char args[256];
596
597         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
598         AUTO_INSERT_FILTER("-vol", "volume", args);
599     }
600
601     if (ost->apad && of->shortest) {
602         char args[256];
603         int i;
604
605         for (i=0; i<of->ctx->nb_streams; i++)
606             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
607                 break;
608
609         if (i<of->ctx->nb_streams) {
610             snprintf(args, sizeof(args), "%s", ost->apad);
611             AUTO_INSERT_FILTER("-apad", "apad", args);
612         }
613     }
614
615     snprintf(name, sizeof(name), "trim for output stream %d:%d",
616              ost->file_index, ost->index);
617     ret = insert_trim(of->start_time, of->recording_time,
618                       &last_filter, &pad_idx, name);
619     if (ret < 0)
620         return ret;
621
622     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
623         return ret;
624
625     return 0;
626 }
627
628 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
629 {                                                                  \
630     AVFilterContext *ctx = inout->filter_ctx;                      \
631     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
632     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
633     AVIOContext *pb;                                               \
634                                                                    \
635     if (avio_open_dyn_buf(&pb) < 0)                                \
636         exit_program(1);                                           \
637                                                                    \
638     avio_printf(pb, "%s", ctx->filter->name);                      \
639     if (nb_pads > 1)                                               \
640         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
641     avio_w8(pb, 0);                                                \
642     avio_close_dyn_buf(pb, &f->name);                              \
643 }
644
645 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
646 {
647     av_freep(&ofilter->name);
648     DESCRIBE_FILTER_LINK(ofilter, out, 0);
649
650     if (!ofilter->ost) {
651         av_log(NULL, AV_LOG_FATAL, "Filter %s has a unconnected output\n", ofilter->name);
652         exit_program(1);
653     }
654
655     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
656     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
657     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
658     default: av_assert0(0);
659     }
660 }
661
662 static int sub2video_prepare(InputStream *ist)
663 {
664     AVFormatContext *avf = input_files[ist->file_index]->ctx;
665     int i, w, h;
666
667     /* Compute the size of the canvas for the subtitles stream.
668        If the subtitles codec has set a size, use it. Otherwise use the
669        maximum dimensions of the video streams in the same file. */
670     w = ist->dec_ctx->width;
671     h = ist->dec_ctx->height;
672     if (!(w && h)) {
673         for (i = 0; i < avf->nb_streams; i++) {
674             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
675                 w = FFMAX(w, avf->streams[i]->codec->width);
676                 h = FFMAX(h, avf->streams[i]->codec->height);
677             }
678         }
679         if (!(w && h)) {
680             w = FFMAX(w, 720);
681             h = FFMAX(h, 576);
682         }
683         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
684     }
685     ist->sub2video.w = ist->resample_width  = w;
686     ist->sub2video.h = ist->resample_height = h;
687
688     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
689        palettes for all rectangles are identical or compatible */
690     ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
691
692     ist->sub2video.frame = av_frame_alloc();
693     if (!ist->sub2video.frame)
694         return AVERROR(ENOMEM);
695     ist->sub2video.last_pts = INT64_MIN;
696     return 0;
697 }
698
699 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
700                                         AVFilterInOut *in)
701 {
702     AVFilterContext *last_filter;
703     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
704     InputStream *ist = ifilter->ist;
705     InputFile     *f = input_files[ist->file_index];
706     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
707                                          ist->st->time_base;
708     AVRational fr = ist->framerate;
709     AVRational sar;
710     AVBPrint args;
711     char name[255];
712     int ret, pad_idx = 0;
713     int64_t tsoffset = 0;
714
715     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
716         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
717         return AVERROR(EINVAL);
718     }
719
720     if (!fr.num)
721         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
722
723     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
724         ret = sub2video_prepare(ist);
725         if (ret < 0)
726             return ret;
727     }
728
729     sar = ist->st->sample_aspect_ratio.num ?
730           ist->st->sample_aspect_ratio :
731           ist->dec_ctx->sample_aspect_ratio;
732     if(!sar.den)
733         sar = (AVRational){0,1};
734     av_bprint_init(&args, 0, 1);
735     av_bprintf(&args,
736              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
737              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
738              ist->resample_height,
739              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
740              tb.num, tb.den, sar.num, sar.den,
741              SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
742     if (fr.num && fr.den)
743         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
744     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
745              ist->file_index, ist->st->index);
746
747     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
748                                             args.str, NULL, fg->graph)) < 0)
749         return ret;
750     last_filter = ifilter->filter;
751
752     if (ist->autorotate) {
753         double theta = get_rotation(ist->st);
754
755         if (fabs(theta - 90) < 1.0) {
756             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
757         } else if (fabs(theta - 180) < 1.0) {
758             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
759             if (ret < 0)
760                 return ret;
761             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
762         } else if (fabs(theta - 270) < 1.0) {
763             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
764         } else if (fabs(theta) > 1.0) {
765             char rotate_buf[64];
766             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
767             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
768         }
769         if (ret < 0)
770             return ret;
771     }
772
773     if (ist->framerate.num) {
774         AVFilterContext *setpts;
775
776         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
777                  ist->file_index, ist->st->index);
778         if ((ret = avfilter_graph_create_filter(&setpts,
779                                                 avfilter_get_by_name("setpts"),
780                                                 name, "N", NULL,
781                                                 fg->graph)) < 0)
782             return ret;
783
784         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
785             return ret;
786
787         last_filter = setpts;
788     }
789
790     if (do_deinterlace) {
791         AVFilterContext *yadif;
792
793         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
794                  ist->file_index, ist->st->index);
795         if ((ret = avfilter_graph_create_filter(&yadif,
796                                                 avfilter_get_by_name("yadif"),
797                                                 name, "", NULL,
798                                                 fg->graph)) < 0)
799             return ret;
800
801         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
802             return ret;
803
804         last_filter = yadif;
805     }
806
807     snprintf(name, sizeof(name), "trim for input stream %d:%d",
808              ist->file_index, ist->st->index);
809     if (copy_ts) {
810         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
811         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
812             tsoffset += f->ctx->start_time;
813     }
814     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
815                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
816                       &last_filter, &pad_idx, name);
817     if (ret < 0)
818         return ret;
819
820     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
821         return ret;
822     return 0;
823 }
824
825 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
826                                         AVFilterInOut *in)
827 {
828     AVFilterContext *last_filter;
829     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
830     InputStream *ist = ifilter->ist;
831     InputFile     *f = input_files[ist->file_index];
832     AVBPrint args;
833     char name[255];
834     int ret, pad_idx = 0;
835     int64_t tsoffset = 0;
836
837     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
838         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
839         return AVERROR(EINVAL);
840     }
841
842     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
843     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
844              1, ist->dec_ctx->sample_rate,
845              ist->dec_ctx->sample_rate,
846              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
847     if (ist->dec_ctx->channel_layout)
848         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
849                    ist->dec_ctx->channel_layout);
850     else
851         av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
852     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
853              ist->file_index, ist->st->index);
854
855     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
856                                             name, args.str, NULL,
857                                             fg->graph)) < 0)
858         return ret;
859     last_filter = ifilter->filter;
860
861 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
862     AVFilterContext *filt_ctx;                                              \
863                                                                             \
864     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
865            "similarly to -af " filter_name "=%s.\n", arg);                  \
866                                                                             \
867     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
868                 fg->index, filter_name, ist->file_index, ist->st->index);   \
869     ret = avfilter_graph_create_filter(&filt_ctx,                           \
870                                        avfilter_get_by_name(filter_name),   \
871                                        name, arg, NULL, fg->graph);         \
872     if (ret < 0)                                                            \
873         return ret;                                                         \
874                                                                             \
875     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
876     if (ret < 0)                                                            \
877         return ret;                                                         \
878                                                                             \
879     last_filter = filt_ctx;                                                 \
880 } while (0)
881
882     if (audio_sync_method > 0) {
883         char args[256] = {0};
884
885         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
886         if (audio_drift_threshold != 0.1)
887             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
888         if (!fg->reconfiguration)
889             av_strlcatf(args, sizeof(args), ":first_pts=0");
890         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
891     }
892
893 //     if (ost->audio_channels_mapped) {
894 //         int i;
895 //         AVBPrint pan_buf;
896 //         av_bprint_init(&pan_buf, 256, 8192);
897 //         av_bprintf(&pan_buf, "0x%"PRIx64,
898 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
899 //         for (i = 0; i < ost->audio_channels_mapped; i++)
900 //             if (ost->audio_channels_map[i] != -1)
901 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
902 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
903 //         av_bprint_finalize(&pan_buf, NULL);
904 //     }
905
906     if (audio_volume != 256) {
907         char args[256];
908
909         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
910                "audio filter instead.\n");
911
912         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
913         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
914     }
915
916     snprintf(name, sizeof(name), "trim for input stream %d:%d",
917              ist->file_index, ist->st->index);
918     if (copy_ts) {
919         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
920         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
921             tsoffset += f->ctx->start_time;
922     }
923     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
924                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
925                       &last_filter, &pad_idx, name);
926     if (ret < 0)
927         return ret;
928
929     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
930         return ret;
931
932     return 0;
933 }
934
935 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
936                                   AVFilterInOut *in)
937 {
938     av_freep(&ifilter->name);
939     DESCRIBE_FILTER_LINK(ifilter, in, 1);
940
941     if (!ifilter->ist->dec) {
942         av_log(NULL, AV_LOG_ERROR,
943                "No decoder for stream #%d:%d, filtering impossible\n",
944                ifilter->ist->file_index, ifilter->ist->st->index);
945         return AVERROR_DECODER_NOT_FOUND;
946     }
947     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
948     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
949     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
950     default: av_assert0(0);
951     }
952 }
953
954 int configure_filtergraph(FilterGraph *fg)
955 {
956     AVFilterInOut *inputs, *outputs, *cur;
957     int ret, i, simple = !fg->graph_desc;
958     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
959                                       fg->graph_desc;
960
961     avfilter_graph_free(&fg->graph);
962     if (!(fg->graph = avfilter_graph_alloc()))
963         return AVERROR(ENOMEM);
964
965     if (simple) {
966         OutputStream *ost = fg->outputs[0]->ost;
967         char args[512];
968         AVDictionaryEntry *e = NULL;
969
970         args[0] = 0;
971         while ((e = av_dict_get(ost->sws_dict, "", e,
972                                 AV_DICT_IGNORE_SUFFIX))) {
973             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
974         }
975         if (strlen(args))
976             args[strlen(args)-1] = 0;
977         fg->graph->scale_sws_opts = av_strdup(args);
978
979         args[0] = 0;
980         while ((e = av_dict_get(ost->swr_opts, "", e,
981                                 AV_DICT_IGNORE_SUFFIX))) {
982             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
983         }
984         if (strlen(args))
985             args[strlen(args)-1] = 0;
986         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
987
988         args[0] = '\0';
989         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
990                                 AV_DICT_IGNORE_SUFFIX))) {
991             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
992         }
993         if (strlen(args))
994             args[strlen(args) - 1] = '\0';
995         fg->graph->resample_lavr_opts = av_strdup(args);
996
997         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
998         if (e)
999             av_opt_set(fg->graph, "threads", e->value, 0);
1000     }
1001
1002     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1003         return ret;
1004
1005     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1006         const char *num_inputs;
1007         const char *num_outputs;
1008         if (!outputs) {
1009             num_outputs = "0";
1010         } else if (outputs->next) {
1011             num_outputs = ">1";
1012         } else {
1013             num_outputs = "1";
1014         }
1015         if (!inputs) {
1016             num_inputs = "0";
1017         } else if (inputs->next) {
1018             num_inputs = ">1";
1019         } else {
1020             num_inputs = "1";
1021         }
1022         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1023                "to have exactly 1 input and 1 output."
1024                " However, it had %s input(s) and %s output(s)."
1025                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1026                graph_desc, num_inputs, num_outputs);
1027         return AVERROR(EINVAL);
1028     }
1029
1030     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1031         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1032             avfilter_inout_free(&inputs);
1033             avfilter_inout_free(&outputs);
1034             return ret;
1035         }
1036     avfilter_inout_free(&inputs);
1037
1038     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1039         configure_output_filter(fg, fg->outputs[i], cur);
1040     avfilter_inout_free(&outputs);
1041
1042     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1043         return ret;
1044
1045     fg->reconfiguration = 1;
1046
1047     for (i = 0; i < fg->nb_outputs; i++) {
1048         OutputStream *ost = fg->outputs[i]->ost;
1049         if (!ost->enc) {
1050             /* identical to the same check in ffmpeg.c, needed because
1051                complex filter graphs are initialized earlier */
1052             av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
1053                      avcodec_get_name(ost->st->codec->codec_id), ost->file_index, ost->index);
1054             return AVERROR(EINVAL);
1055         }
1056         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1057             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1058             av_buffersink_set_frame_size(ost->filter->filter,
1059                                          ost->enc_ctx->frame_size);
1060     }
1061
1062     return 0;
1063 }
1064
1065 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1066 {
1067     int i;
1068     for (i = 0; i < fg->nb_inputs; i++)
1069         if (fg->inputs[i]->ist == ist)
1070             return 1;
1071     return 0;
1072 }
1073