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fftools/ffmpeg_filter: Avoid allocations when configuring output filters
[ffmpeg] / fftools / ffmpeg_filter.c
1 /*
2  * ffmpeg filter configuration
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 #include <stdint.h>
22
23 #include "ffmpeg.h"
24
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/buffersink.h"
27 #include "libavfilter/buffersrc.h"
28
29 #include "libavresample/avresample.h"
30
31 #include "libavutil/avassert.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/bprint.h"
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/display.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/pixdesc.h"
38 #include "libavutil/pixfmt.h"
39 #include "libavutil/imgutils.h"
40 #include "libavutil/samplefmt.h"
41
42 // FIXME: YUV420P etc. are actually supported with full color range,
43 // yet the latter information isn't available here.
44 static const enum AVPixelFormat *get_compliance_normal_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
45 {
46     static const enum AVPixelFormat mjpeg_formats[] =
47         { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
48           AV_PIX_FMT_NONE };
49
50     if (codec_id == AV_CODEC_ID_MJPEG) {
51         return mjpeg_formats;
52     } else {
53         return default_formats;
54     }
55 }
56
57 static enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx,
58                                     const AVCodec *codec, enum AVPixelFormat target)
59 {
60     if (codec && codec->pix_fmts) {
61         const enum AVPixelFormat *p = codec->pix_fmts;
62         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
63         //FIXME: This should check for AV_PIX_FMT_FLAG_ALPHA after PAL8 pixel format without alpha is implemented
64         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
65         enum AVPixelFormat best= AV_PIX_FMT_NONE;
66
67         if (enc_ctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
68             p = get_compliance_normal_pix_fmts(enc_ctx->codec_id, p);
69         }
70         for (; *p != AV_PIX_FMT_NONE; p++) {
71             best = av_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
72             if (*p == target)
73                 break;
74         }
75         if (*p == AV_PIX_FMT_NONE) {
76             if (target != AV_PIX_FMT_NONE)
77                 av_log(NULL, AV_LOG_WARNING,
78                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
79                        av_get_pix_fmt_name(target),
80                        codec->name,
81                        av_get_pix_fmt_name(best));
82             return best;
83         }
84     }
85     return target;
86 }
87
88 static char *choose_pix_fmts(OutputFilter *ofilter)
89 {
90     OutputStream *ost = ofilter->ost;
91     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
92     if (strict_dict)
93         // used by choose_pixel_fmt() and below
94         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
95
96      if (ost->keep_pix_fmt) {
97         avfilter_graph_set_auto_convert(ofilter->graph->graph,
98                                             AVFILTER_AUTO_CONVERT_NONE);
99         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
100             return NULL;
101         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
102     }
103     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
104         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->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->enc_ctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
116             p = get_compliance_normal_pix_fmts(ost->enc_ctx->codec_id, p);
117         }
118
119         for (; *p != AV_PIX_FMT_NONE; p++) {
120             const char *name = av_get_pix_fmt_name(*p);
121             avio_printf(s, "%s|", name);
122         }
123         len = avio_close_dyn_buf(s, &ret);
124         ret[len - 1] = 0;
125         return ret;
126     } else
127         return NULL;
128 }
129
130 /* Define a function for appending a list of allowed formats
131  * to an AVBPrint. If nonempty, the list will have a header. */
132 #define DEF_CHOOSE_FORMAT(name, type, var, supported_list, none, printf_format, get_name) \
133 static void choose_ ## name (OutputFilter *ofilter, AVBPrint *bprint)          \
134 {                                                                              \
135     if (ofilter->var == none && !ofilter->supported_list)                      \
136         return;                                                                \
137     av_bprintf(bprint, #name "=");                                             \
138     if (ofilter->var != none) {                                                \
139         av_bprintf(bprint, printf_format, get_name(ofilter->var));             \
140     } else {                                                                   \
141         const type *p;                                                         \
142                                                                                \
143         for (p = ofilter->supported_list; *p != none; p++) {                   \
144             av_bprintf(bprint, printf_format "|", get_name(*p));               \
145         }                                                                      \
146         if (bprint->len > 0)                                                   \
147             bprint->str[--bprint->len] = '\0';                                 \
148     }                                                                          \
149     av_bprint_chars(bprint, ':', 1);                                           \
150 }
151
152 //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
153 //                  GET_PIX_FMT_NAME)
154
155 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
156                   AV_SAMPLE_FMT_NONE, "%s", av_get_sample_fmt_name)
157
158 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
159                   "%d", )
160
161 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
162                   "0x%"PRIx64, )
163
164 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
165 {
166     FilterGraph *fg = av_mallocz(sizeof(*fg));
167
168     if (!fg)
169         exit_program(1);
170     fg->index = nb_filtergraphs;
171
172     GROW_ARRAY(fg->outputs, fg->nb_outputs);
173     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
174         exit_program(1);
175     fg->outputs[0]->ost   = ost;
176     fg->outputs[0]->graph = fg;
177     fg->outputs[0]->format = -1;
178
179     ost->filter = fg->outputs[0];
180
181     GROW_ARRAY(fg->inputs, fg->nb_inputs);
182     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
183         exit_program(1);
184     fg->inputs[0]->ist   = ist;
185     fg->inputs[0]->graph = fg;
186     fg->inputs[0]->format = -1;
187
188     fg->inputs[0]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
189     if (!fg->inputs[0]->frame_queue)
190         exit_program(1);
191
192     GROW_ARRAY(ist->filters, ist->nb_filters);
193     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
194
195     GROW_ARRAY(filtergraphs, nb_filtergraphs);
196     filtergraphs[nb_filtergraphs - 1] = fg;
197
198     return 0;
199 }
200
201 static char *describe_filter_link(FilterGraph *fg, AVFilterInOut *inout, int in)
202 {
203     AVFilterContext *ctx = inout->filter_ctx;
204     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;
205     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;
206     AVIOContext *pb;
207     uint8_t *res = NULL;
208
209     if (avio_open_dyn_buf(&pb) < 0)
210         exit_program(1);
211
212     avio_printf(pb, "%s", ctx->filter->name);
213     if (nb_pads > 1)
214         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));
215     avio_w8(pb, 0);
216     avio_close_dyn_buf(pb, &res);
217     return res;
218 }
219
220 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
221 {
222     InputStream *ist = NULL;
223     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
224     int i;
225
226     // TODO: support other filter types
227     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
228         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
229                "currently.\n");
230         exit_program(1);
231     }
232
233     if (in->name) {
234         AVFormatContext *s;
235         AVStream       *st = NULL;
236         char *p;
237         int file_idx = strtol(in->name, &p, 0);
238
239         if (file_idx < 0 || file_idx >= nb_input_files) {
240             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
241                    file_idx, fg->graph_desc);
242             exit_program(1);
243         }
244         s = input_files[file_idx]->ctx;
245
246         for (i = 0; i < s->nb_streams; i++) {
247             enum AVMediaType stream_type = s->streams[i]->codecpar->codec_type;
248             if (stream_type != type &&
249                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
250                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
251                 continue;
252             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
253                 st = s->streams[i];
254                 break;
255             }
256         }
257         if (!st) {
258             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
259                    "matches no streams.\n", p, fg->graph_desc);
260             exit_program(1);
261         }
262         ist = input_streams[input_files[file_idx]->ist_index + st->index];
263         if (ist->user_set_discard == AVDISCARD_ALL) {
264             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
265                    "matches a disabled input stream.\n", p, fg->graph_desc);
266             exit_program(1);
267         }
268     } else {
269         /* find the first unused stream of corresponding type */
270         for (i = 0; i < nb_input_streams; i++) {
271             ist = input_streams[i];
272             if (ist->user_set_discard == AVDISCARD_ALL)
273                 continue;
274             if (ist->dec_ctx->codec_type == type && ist->discard)
275                 break;
276         }
277         if (i == nb_input_streams) {
278             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
279                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
280                    in->filter_ctx->name);
281             exit_program(1);
282         }
283     }
284     av_assert0(ist);
285
286     ist->discard         = 0;
287     ist->decoding_needed |= DECODING_FOR_FILTER;
288     ist->st->discard = AVDISCARD_NONE;
289
290     GROW_ARRAY(fg->inputs, fg->nb_inputs);
291     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
292         exit_program(1);
293     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
294     fg->inputs[fg->nb_inputs - 1]->graph = fg;
295     fg->inputs[fg->nb_inputs - 1]->format = -1;
296     fg->inputs[fg->nb_inputs - 1]->type = ist->st->codecpar->codec_type;
297     fg->inputs[fg->nb_inputs - 1]->name = describe_filter_link(fg, in, 1);
298
299     fg->inputs[fg->nb_inputs - 1]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
300     if (!fg->inputs[fg->nb_inputs - 1]->frame_queue)
301         exit_program(1);
302
303     GROW_ARRAY(ist->filters, ist->nb_filters);
304     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
305 }
306
307 int init_complex_filtergraph(FilterGraph *fg)
308 {
309     AVFilterInOut *inputs, *outputs, *cur;
310     AVFilterGraph *graph;
311     int ret = 0;
312
313     /* this graph is only used for determining the kinds of inputs
314      * and outputs we have, and is discarded on exit from this function */
315     graph = avfilter_graph_alloc();
316     if (!graph)
317         return AVERROR(ENOMEM);
318     graph->nb_threads = 1;
319
320     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
321     if (ret < 0)
322         goto fail;
323
324     for (cur = inputs; cur; cur = cur->next)
325         init_input_filter(fg, cur);
326
327     for (cur = outputs; cur;) {
328         GROW_ARRAY(fg->outputs, fg->nb_outputs);
329         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
330         if (!fg->outputs[fg->nb_outputs - 1])
331             exit_program(1);
332
333         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
334         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
335         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
336                                                                          cur->pad_idx);
337         fg->outputs[fg->nb_outputs - 1]->name = describe_filter_link(fg, cur, 0);
338         cur = cur->next;
339         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
340     }
341
342 fail:
343     avfilter_inout_free(&inputs);
344     avfilter_graph_free(&graph);
345     return ret;
346 }
347
348 static int insert_trim(int64_t start_time, int64_t duration,
349                        AVFilterContext **last_filter, int *pad_idx,
350                        const char *filter_name)
351 {
352     AVFilterGraph *graph = (*last_filter)->graph;
353     AVFilterContext *ctx;
354     const AVFilter *trim;
355     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
356     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
357     int ret = 0;
358
359     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
360         return 0;
361
362     trim = avfilter_get_by_name(name);
363     if (!trim) {
364         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
365                "recording time.\n", name);
366         return AVERROR_FILTER_NOT_FOUND;
367     }
368
369     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
370     if (!ctx)
371         return AVERROR(ENOMEM);
372
373     if (duration != INT64_MAX) {
374         ret = av_opt_set_int(ctx, "durationi", duration,
375                                 AV_OPT_SEARCH_CHILDREN);
376     }
377     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
378         ret = av_opt_set_int(ctx, "starti", start_time,
379                                 AV_OPT_SEARCH_CHILDREN);
380     }
381     if (ret < 0) {
382         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
383         return ret;
384     }
385
386     ret = avfilter_init_str(ctx, NULL);
387     if (ret < 0)
388         return ret;
389
390     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
391     if (ret < 0)
392         return ret;
393
394     *last_filter = ctx;
395     *pad_idx     = 0;
396     return 0;
397 }
398
399 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
400                          const char *filter_name, const char *args)
401 {
402     AVFilterGraph *graph = (*last_filter)->graph;
403     AVFilterContext *ctx;
404     int ret;
405
406     ret = avfilter_graph_create_filter(&ctx,
407                                        avfilter_get_by_name(filter_name),
408                                        filter_name, args, NULL, graph);
409     if (ret < 0)
410         return ret;
411
412     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
413     if (ret < 0)
414         return ret;
415
416     *last_filter = ctx;
417     *pad_idx     = 0;
418     return 0;
419 }
420
421 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
422 {
423     char *pix_fmts;
424     OutputStream *ost = ofilter->ost;
425     OutputFile    *of = output_files[ost->file_index];
426     AVFilterContext *last_filter = out->filter_ctx;
427     int pad_idx = out->pad_idx;
428     int ret;
429     char name[255];
430
431     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
432     ret = avfilter_graph_create_filter(&ofilter->filter,
433                                        avfilter_get_by_name("buffersink"),
434                                        name, NULL, NULL, fg->graph);
435
436     if (ret < 0)
437         return ret;
438
439     if ((ofilter->width || ofilter->height) && ofilter->ost->autoscale) {
440         char args[255];
441         AVFilterContext *filter;
442         AVDictionaryEntry *e = NULL;
443
444         snprintf(args, sizeof(args), "%d:%d",
445                  ofilter->width, ofilter->height);
446
447         while ((e = av_dict_get(ost->sws_dict, "", e,
448                                 AV_DICT_IGNORE_SUFFIX))) {
449             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
450         }
451
452         snprintf(name, sizeof(name), "scaler_out_%d_%d",
453                  ost->file_index, ost->index);
454         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
455                                                 name, args, NULL, fg->graph)) < 0)
456             return ret;
457         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
458             return ret;
459
460         last_filter = filter;
461         pad_idx = 0;
462     }
463
464     if ((pix_fmts = choose_pix_fmts(ofilter))) {
465         AVFilterContext *filter;
466         snprintf(name, sizeof(name), "format_out_%d_%d",
467                  ost->file_index, ost->index);
468         ret = avfilter_graph_create_filter(&filter,
469                                            avfilter_get_by_name("format"),
470                                            "format", pix_fmts, NULL, fg->graph);
471         av_freep(&pix_fmts);
472         if (ret < 0)
473             return ret;
474         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
475             return ret;
476
477         last_filter = filter;
478         pad_idx     = 0;
479     }
480
481     if (ost->frame_rate.num && 0) {
482         AVFilterContext *fps;
483         char args[255];
484
485         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
486                  ost->frame_rate.den);
487         snprintf(name, sizeof(name), "fps_out_%d_%d",
488                  ost->file_index, ost->index);
489         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
490                                            name, args, NULL, fg->graph);
491         if (ret < 0)
492             return ret;
493
494         ret = avfilter_link(last_filter, pad_idx, fps, 0);
495         if (ret < 0)
496             return ret;
497         last_filter = fps;
498         pad_idx = 0;
499     }
500
501     snprintf(name, sizeof(name), "trim_out_%d_%d",
502              ost->file_index, ost->index);
503     ret = insert_trim(of->start_time, of->recording_time,
504                       &last_filter, &pad_idx, name);
505     if (ret < 0)
506         return ret;
507
508
509     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
510         return ret;
511
512     return 0;
513 }
514
515 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
516 {
517     OutputStream *ost = ofilter->ost;
518     OutputFile    *of = output_files[ost->file_index];
519     AVCodecContext *codec  = ost->enc_ctx;
520     AVFilterContext *last_filter = out->filter_ctx;
521     int pad_idx = out->pad_idx;
522     AVBPrint args;
523     char name[255];
524     int ret;
525
526     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
527     ret = avfilter_graph_create_filter(&ofilter->filter,
528                                        avfilter_get_by_name("abuffersink"),
529                                        name, NULL, NULL, fg->graph);
530     if (ret < 0)
531         return ret;
532     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
533         return ret;
534
535 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
536     AVFilterContext *filt_ctx;                                              \
537                                                                             \
538     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
539            "similarly to -af " filter_name "=%s.\n", arg);                  \
540                                                                             \
541     ret = avfilter_graph_create_filter(&filt_ctx,                           \
542                                        avfilter_get_by_name(filter_name),   \
543                                        filter_name, arg, NULL, fg->graph);  \
544     if (ret < 0)                                                            \
545         goto fail;                                                          \
546                                                                             \
547     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
548     if (ret < 0)                                                            \
549         goto fail;                                                          \
550                                                                             \
551     last_filter = filt_ctx;                                                 \
552     pad_idx = 0;                                                            \
553 } while (0)
554     av_bprint_init(&args, 0, AV_BPRINT_SIZE_UNLIMITED);
555     if (ost->audio_channels_mapped) {
556         int i;
557         av_bprintf(&args, "0x%"PRIx64,
558                    av_get_default_channel_layout(ost->audio_channels_mapped));
559         for (i = 0; i < ost->audio_channels_mapped; i++)
560             if (ost->audio_channels_map[i] != -1)
561                 av_bprintf(&args, "|c%d=c%d", i, ost->audio_channels_map[i]);
562
563         AUTO_INSERT_FILTER("-map_channel", "pan", args.str);
564         av_bprint_clear(&args);
565     }
566
567     if (codec->channels && !codec->channel_layout)
568         codec->channel_layout = av_get_default_channel_layout(codec->channels);
569
570     choose_sample_fmts(ofilter,     &args);
571     choose_sample_rates(ofilter,    &args);
572     choose_channel_layouts(ofilter, &args);
573     if (!av_bprint_is_complete(&args)) {
574         ret = AVERROR(ENOMEM);
575         goto fail;
576     }
577     if (args.len) {
578         AVFilterContext *format;
579
580         snprintf(name, sizeof(name), "format_out_%d_%d",
581                  ost->file_index, ost->index);
582         ret = avfilter_graph_create_filter(&format,
583                                            avfilter_get_by_name("aformat"),
584                                            name, args.str, NULL, fg->graph);
585         if (ret < 0)
586             goto fail;
587
588         ret = avfilter_link(last_filter, pad_idx, format, 0);
589         if (ret < 0)
590             goto fail;
591
592         last_filter = format;
593         pad_idx = 0;
594     }
595
596     if (ost->apad && of->shortest) {
597         char args[256];
598         int i;
599
600         for (i=0; i<of->ctx->nb_streams; i++)
601             if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
602                 break;
603
604         if (i<of->ctx->nb_streams) {
605             snprintf(args, sizeof(args), "%s", ost->apad);
606             AUTO_INSERT_FILTER("-apad", "apad", args);
607         }
608     }
609
610     snprintf(name, sizeof(name), "trim for output stream %d:%d",
611              ost->file_index, ost->index);
612     ret = insert_trim(of->start_time, of->recording_time,
613                       &last_filter, &pad_idx, name);
614     if (ret < 0)
615         goto fail;
616
617     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
618         goto fail;
619 fail:
620     av_bprint_finalize(&args, NULL);
621
622     return ret;
623 }
624
625 static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter,
626                                    AVFilterInOut *out)
627 {
628     if (!ofilter->ost) {
629         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
630         exit_program(1);
631     }
632
633     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
634     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
635     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
636     default: av_assert0(0);
637     }
638 }
639
640 void check_filter_outputs(void)
641 {
642     int i;
643     for (i = 0; i < nb_filtergraphs; i++) {
644         int n;
645         for (n = 0; n < filtergraphs[i]->nb_outputs; n++) {
646             OutputFilter *output = filtergraphs[i]->outputs[n];
647             if (!output->ost) {
648                 av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", output->name);
649                 exit_program(1);
650             }
651         }
652     }
653 }
654
655 static int sub2video_prepare(InputStream *ist, InputFilter *ifilter)
656 {
657     AVFormatContext *avf = input_files[ist->file_index]->ctx;
658     int i, w, h;
659
660     /* Compute the size of the canvas for the subtitles stream.
661        If the subtitles codecpar has set a size, use it. Otherwise use the
662        maximum dimensions of the video streams in the same file. */
663     w = ifilter->width;
664     h = ifilter->height;
665     if (!(w && h)) {
666         for (i = 0; i < avf->nb_streams; i++) {
667             if (avf->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
668                 w = FFMAX(w, avf->streams[i]->codecpar->width);
669                 h = FFMAX(h, avf->streams[i]->codecpar->height);
670             }
671         }
672         if (!(w && h)) {
673             w = FFMAX(w, 720);
674             h = FFMAX(h, 576);
675         }
676         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
677     }
678     ist->sub2video.w = ifilter->width  = w;
679     ist->sub2video.h = ifilter->height = h;
680
681     ifilter->width  = ist->dec_ctx->width  ? ist->dec_ctx->width  : ist->sub2video.w;
682     ifilter->height = ist->dec_ctx->height ? ist->dec_ctx->height : ist->sub2video.h;
683
684     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
685        palettes for all rectangles are identical or compatible */
686     ifilter->format = AV_PIX_FMT_RGB32;
687
688     ist->sub2video.frame = av_frame_alloc();
689     if (!ist->sub2video.frame)
690         return AVERROR(ENOMEM);
691     ist->sub2video.last_pts = INT64_MIN;
692     ist->sub2video.end_pts  = INT64_MIN;
693
694     /* sub2video structure has been (re-)initialized.
695        Mark it as such so that the system will be
696        initialized with the first received heartbeat. */
697     ist->sub2video.initialize = 1;
698
699     return 0;
700 }
701
702 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
703                                         AVFilterInOut *in)
704 {
705     AVFilterContext *last_filter;
706     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
707     InputStream *ist = ifilter->ist;
708     InputFile     *f = input_files[ist->file_index];
709     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
710                                          ist->st->time_base;
711     AVRational fr = ist->framerate;
712     AVRational sar;
713     AVBPrint args;
714     char name[255];
715     int ret, pad_idx = 0;
716     int64_t tsoffset = 0;
717     AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
718
719     if (!par)
720         return AVERROR(ENOMEM);
721     memset(par, 0, sizeof(*par));
722     par->format = AV_PIX_FMT_NONE;
723
724     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
725         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
726         ret = AVERROR(EINVAL);
727         goto fail;
728     }
729
730     if (!fr.num)
731         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
732
733     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
734         ret = sub2video_prepare(ist, ifilter);
735         if (ret < 0)
736             goto fail;
737     }
738
739     sar = ifilter->sample_aspect_ratio;
740     if(!sar.den)
741         sar = (AVRational){0,1};
742     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
743     av_bprintf(&args,
744              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
745              "pixel_aspect=%d/%d",
746              ifilter->width, ifilter->height, ifilter->format,
747              tb.num, tb.den, sar.num, sar.den);
748     if (fr.num && fr.den)
749         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
750     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
751              ist->file_index, ist->st->index);
752
753
754     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
755                                             args.str, NULL, fg->graph)) < 0)
756         goto fail;
757     par->hw_frames_ctx = ifilter->hw_frames_ctx;
758     ret = av_buffersrc_parameters_set(ifilter->filter, par);
759     if (ret < 0)
760         goto fail;
761     av_freep(&par);
762     last_filter = ifilter->filter;
763
764     if (ist->autorotate) {
765         double theta = get_rotation(ist->st);
766
767         if (fabs(theta - 90) < 1.0) {
768             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
769         } else if (fabs(theta - 180) < 1.0) {
770             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
771             if (ret < 0)
772                 return ret;
773             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
774         } else if (fabs(theta - 270) < 1.0) {
775             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
776         } else if (fabs(theta) > 1.0) {
777             char rotate_buf[64];
778             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
779             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
780         }
781         if (ret < 0)
782             return ret;
783     }
784
785     if (do_deinterlace) {
786         AVFilterContext *yadif;
787
788         snprintf(name, sizeof(name), "deinterlace_in_%d_%d",
789                  ist->file_index, ist->st->index);
790         if ((ret = avfilter_graph_create_filter(&yadif,
791                                                 avfilter_get_by_name("yadif"),
792                                                 name, "", NULL,
793                                                 fg->graph)) < 0)
794             return ret;
795
796         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
797             return ret;
798
799         last_filter = yadif;
800     }
801
802     snprintf(name, sizeof(name), "trim_in_%d_%d",
803              ist->file_index, ist->st->index);
804     if (copy_ts) {
805         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
806         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
807             tsoffset += f->ctx->start_time;
808     }
809     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
810                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
811                       &last_filter, &pad_idx, name);
812     if (ret < 0)
813         return ret;
814
815     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
816         return ret;
817     return 0;
818 fail:
819     av_freep(&par);
820
821     return ret;
822 }
823
824 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
825                                         AVFilterInOut *in)
826 {
827     AVFilterContext *last_filter;
828     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
829     InputStream *ist = ifilter->ist;
830     InputFile     *f = input_files[ist->file_index];
831     AVBPrint args;
832     char name[255];
833     int ret, pad_idx = 0;
834     int64_t tsoffset = 0;
835
836     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
837         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
838         return AVERROR(EINVAL);
839     }
840
841     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
842     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
843              1, ifilter->sample_rate,
844              ifilter->sample_rate,
845              av_get_sample_fmt_name(ifilter->format));
846     if (ifilter->channel_layout)
847         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
848                    ifilter->channel_layout);
849     else
850         av_bprintf(&args, ":channels=%d", ifilter->channels);
851     snprintf(name, sizeof(name), "graph_%d_in_%d_%d", fg->index,
852              ist->file_index, ist->st->index);
853
854     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
855                                             name, args.str, NULL,
856                                             fg->graph)) < 0)
857         return ret;
858     last_filter = ifilter->filter;
859
860 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
861     AVFilterContext *filt_ctx;                                              \
862                                                                             \
863     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
864            "similarly to -af " filter_name "=%s.\n", arg);                  \
865                                                                             \
866     snprintf(name, sizeof(name), "graph_%d_%s_in_%d_%d",      \
867                 fg->index, filter_name, ist->file_index, ist->st->index);   \
868     ret = avfilter_graph_create_filter(&filt_ctx,                           \
869                                        avfilter_get_by_name(filter_name),   \
870                                        name, arg, NULL, fg->graph);         \
871     if (ret < 0)                                                            \
872         return ret;                                                         \
873                                                                             \
874     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
875     if (ret < 0)                                                            \
876         return ret;                                                         \
877                                                                             \
878     last_filter = filt_ctx;                                                 \
879 } while (0)
880
881     if (audio_sync_method > 0) {
882         char args[256] = {0};
883
884         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
885         if (audio_drift_threshold != 0.1)
886             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
887         if (!fg->reconfiguration)
888             av_strlcatf(args, sizeof(args), ":first_pts=0");
889         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
890     }
891
892 //     if (ost->audio_channels_mapped) {
893 //         int i;
894 //         AVBPrint pan_buf;
895 //         av_bprint_init(&pan_buf, 256, 8192);
896 //         av_bprintf(&pan_buf, "0x%"PRIx64,
897 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
898 //         for (i = 0; i < ost->audio_channels_mapped; i++)
899 //             if (ost->audio_channels_map[i] != -1)
900 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
901 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
902 //         av_bprint_finalize(&pan_buf, NULL);
903 //     }
904
905     if (audio_volume != 256) {
906         char args[256];
907
908         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
909                "audio filter instead.\n");
910
911         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
912         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
913     }
914
915     snprintf(name, sizeof(name), "trim for input stream %d:%d",
916              ist->file_index, ist->st->index);
917     if (copy_ts) {
918         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
919         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
920             tsoffset += f->ctx->start_time;
921     }
922     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
923                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
924                       &last_filter, &pad_idx, name);
925     if (ret < 0)
926         return ret;
927
928     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
929         return ret;
930
931     return 0;
932 }
933
934 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
935                                   AVFilterInOut *in)
936 {
937     if (!ifilter->ist->dec) {
938         av_log(NULL, AV_LOG_ERROR,
939                "No decoder for stream #%d:%d, filtering impossible\n",
940                ifilter->ist->file_index, ifilter->ist->st->index);
941         return AVERROR_DECODER_NOT_FOUND;
942     }
943     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
944     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
945     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
946     default: av_assert0(0);
947     }
948 }
949
950 static void cleanup_filtergraph(FilterGraph *fg)
951 {
952     int i;
953     for (i = 0; i < fg->nb_outputs; i++)
954         fg->outputs[i]->filter = (AVFilterContext *)NULL;
955     for (i = 0; i < fg->nb_inputs; i++)
956         fg->inputs[i]->filter = (AVFilterContext *)NULL;
957     avfilter_graph_free(&fg->graph);
958 }
959
960 int configure_filtergraph(FilterGraph *fg)
961 {
962     AVFilterInOut *inputs, *outputs, *cur;
963     int ret, i, simple = filtergraph_is_simple(fg);
964     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
965                                       fg->graph_desc;
966
967     cleanup_filtergraph(fg);
968     if (!(fg->graph = avfilter_graph_alloc()))
969         return AVERROR(ENOMEM);
970
971     if (simple) {
972         OutputStream *ost = fg->outputs[0]->ost;
973         char args[512];
974         AVDictionaryEntry *e = NULL;
975
976         fg->graph->nb_threads = filter_nbthreads;
977
978         args[0] = 0;
979         while ((e = av_dict_get(ost->sws_dict, "", e,
980                                 AV_DICT_IGNORE_SUFFIX))) {
981             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
982         }
983         if (strlen(args))
984             args[strlen(args)-1] = 0;
985         fg->graph->scale_sws_opts = av_strdup(args);
986
987         args[0] = 0;
988         while ((e = av_dict_get(ost->swr_opts, "", e,
989                                 AV_DICT_IGNORE_SUFFIX))) {
990             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
991         }
992         if (strlen(args))
993             args[strlen(args)-1] = 0;
994         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
995
996         args[0] = '\0';
997         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
998                                 AV_DICT_IGNORE_SUFFIX))) {
999             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1000         }
1001         if (strlen(args))
1002             args[strlen(args) - 1] = '\0';
1003
1004         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
1005         if (e)
1006             av_opt_set(fg->graph, "threads", e->value, 0);
1007     } else {
1008         fg->graph->nb_threads = filter_complex_nbthreads;
1009     }
1010
1011     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1012         goto fail;
1013
1014     ret = hw_device_setup_for_filter(fg);
1015     if (ret < 0)
1016         goto fail;
1017
1018     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1019         const char *num_inputs;
1020         const char *num_outputs;
1021         if (!outputs) {
1022             num_outputs = "0";
1023         } else if (outputs->next) {
1024             num_outputs = ">1";
1025         } else {
1026             num_outputs = "1";
1027         }
1028         if (!inputs) {
1029             num_inputs = "0";
1030         } else if (inputs->next) {
1031             num_inputs = ">1";
1032         } else {
1033             num_inputs = "1";
1034         }
1035         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1036                "to have exactly 1 input and 1 output."
1037                " However, it had %s input(s) and %s output(s)."
1038                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1039                graph_desc, num_inputs, num_outputs);
1040         ret = AVERROR(EINVAL);
1041         goto fail;
1042     }
1043
1044     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1045         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1046             avfilter_inout_free(&inputs);
1047             avfilter_inout_free(&outputs);
1048             goto fail;
1049         }
1050     avfilter_inout_free(&inputs);
1051
1052     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1053         configure_output_filter(fg, fg->outputs[i], cur);
1054     avfilter_inout_free(&outputs);
1055
1056     if (!auto_conversion_filters)
1057         avfilter_graph_set_auto_convert(fg->graph, AVFILTER_AUTO_CONVERT_NONE);
1058     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1059         goto fail;
1060
1061     /* limit the lists of allowed formats to the ones selected, to
1062      * make sure they stay the same if the filtergraph is reconfigured later */
1063     for (i = 0; i < fg->nb_outputs; i++) {
1064         OutputFilter *ofilter = fg->outputs[i];
1065         AVFilterContext *sink = ofilter->filter;
1066
1067         ofilter->format = av_buffersink_get_format(sink);
1068
1069         ofilter->width  = av_buffersink_get_w(sink);
1070         ofilter->height = av_buffersink_get_h(sink);
1071
1072         ofilter->sample_rate    = av_buffersink_get_sample_rate(sink);
1073         ofilter->channel_layout = av_buffersink_get_channel_layout(sink);
1074     }
1075
1076     fg->reconfiguration = 1;
1077
1078     for (i = 0; i < fg->nb_outputs; i++) {
1079         OutputStream *ost = fg->outputs[i]->ost;
1080         if (!ost->enc) {
1081             /* identical to the same check in ffmpeg.c, needed because
1082                complex filter graphs are initialized earlier */
1083             av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
1084                      avcodec_get_name(ost->st->codecpar->codec_id), ost->file_index, ost->index);
1085             ret = AVERROR(EINVAL);
1086             goto fail;
1087         }
1088         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1089             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1090             av_buffersink_set_frame_size(ost->filter->filter,
1091                                          ost->enc_ctx->frame_size);
1092     }
1093
1094     for (i = 0; i < fg->nb_inputs; i++) {
1095         while (av_fifo_size(fg->inputs[i]->frame_queue)) {
1096             AVFrame *tmp;
1097             av_fifo_generic_read(fg->inputs[i]->frame_queue, &tmp, sizeof(tmp), NULL);
1098             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, tmp);
1099             av_frame_free(&tmp);
1100             if (ret < 0)
1101                 goto fail;
1102         }
1103     }
1104
1105     /* send the EOFs for the finished inputs */
1106     for (i = 0; i < fg->nb_inputs; i++) {
1107         if (fg->inputs[i]->eof) {
1108             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, NULL);
1109             if (ret < 0)
1110                 goto fail;
1111         }
1112     }
1113
1114     /* process queued up subtitle packets */
1115     for (i = 0; i < fg->nb_inputs; i++) {
1116         InputStream *ist = fg->inputs[i]->ist;
1117         if (ist->sub2video.sub_queue && ist->sub2video.frame) {
1118             while (av_fifo_size(ist->sub2video.sub_queue)) {
1119                 AVSubtitle tmp;
1120                 av_fifo_generic_read(ist->sub2video.sub_queue, &tmp, sizeof(tmp), NULL);
1121                 sub2video_update(ist, INT64_MIN, &tmp);
1122                 avsubtitle_free(&tmp);
1123             }
1124         }
1125     }
1126
1127     return 0;
1128
1129 fail:
1130     cleanup_filtergraph(fg);
1131     return ret;
1132 }
1133
1134 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
1135 {
1136     av_buffer_unref(&ifilter->hw_frames_ctx);
1137
1138     ifilter->format = frame->format;
1139
1140     ifilter->width               = frame->width;
1141     ifilter->height              = frame->height;
1142     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
1143
1144     ifilter->sample_rate         = frame->sample_rate;
1145     ifilter->channels            = frame->channels;
1146     ifilter->channel_layout      = frame->channel_layout;
1147
1148     if (frame->hw_frames_ctx) {
1149         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
1150         if (!ifilter->hw_frames_ctx)
1151             return AVERROR(ENOMEM);
1152     }
1153
1154     return 0;
1155 }
1156
1157 int filtergraph_is_simple(FilterGraph *fg)
1158 {
1159     return !fg->graph_desc;
1160 }