avcodec: Add a min size parameter to ff_alloc_packet2()
[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 & 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
427         snprintf(args, sizeof(args), "%d:%d:0x%X",
428                  codec->width,
429                  codec->height,
430                  (unsigned)ost->sws_flags);
431         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
432                  ost->file_index, ost->index);
433         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
434                                                 name, args, NULL, fg->graph)) < 0)
435             return ret;
436         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
437             return ret;
438
439         last_filter = filter;
440         pad_idx = 0;
441     }
442
443     if ((pix_fmts = choose_pix_fmts(ost))) {
444         AVFilterContext *filter;
445         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
446                  ost->file_index, ost->index);
447         ret = avfilter_graph_create_filter(&filter,
448                                            avfilter_get_by_name("format"),
449                                            "format", pix_fmts, NULL, fg->graph);
450         av_freep(&pix_fmts);
451         if (ret < 0)
452             return ret;
453         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
454             return ret;
455
456         last_filter = filter;
457         pad_idx     = 0;
458     }
459
460     if (ost->frame_rate.num && 0) {
461         AVFilterContext *fps;
462         char args[255];
463
464         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
465                  ost->frame_rate.den);
466         snprintf(name, sizeof(name), "fps for output stream %d:%d",
467                  ost->file_index, ost->index);
468         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
469                                            name, args, NULL, fg->graph);
470         if (ret < 0)
471             return ret;
472
473         ret = avfilter_link(last_filter, pad_idx, fps, 0);
474         if (ret < 0)
475             return ret;
476         last_filter = fps;
477         pad_idx = 0;
478     }
479
480     snprintf(name, sizeof(name), "trim for output stream %d:%d",
481              ost->file_index, ost->index);
482     ret = insert_trim(of->start_time, of->recording_time,
483                       &last_filter, &pad_idx, name);
484     if (ret < 0)
485         return ret;
486
487
488     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
489         return ret;
490
491     return 0;
492 }
493
494 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
495 {
496     OutputStream *ost = ofilter->ost;
497     OutputFile    *of = output_files[ost->file_index];
498     AVCodecContext *codec  = ost->enc_ctx;
499     AVFilterContext *last_filter = out->filter_ctx;
500     int pad_idx = out->pad_idx;
501     char *sample_fmts, *sample_rates, *channel_layouts;
502     char name[255];
503     int ret;
504
505     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
506     ret = avfilter_graph_create_filter(&ofilter->filter,
507                                        avfilter_get_by_name("abuffersink"),
508                                        name, NULL, NULL, fg->graph);
509     if (ret < 0)
510         return ret;
511     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
512         return ret;
513
514 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
515     AVFilterContext *filt_ctx;                                              \
516                                                                             \
517     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
518            "similarly to -af " filter_name "=%s.\n", arg);                  \
519                                                                             \
520     ret = avfilter_graph_create_filter(&filt_ctx,                           \
521                                        avfilter_get_by_name(filter_name),   \
522                                        filter_name, arg, NULL, fg->graph);  \
523     if (ret < 0)                                                            \
524         return ret;                                                         \
525                                                                             \
526     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
527     if (ret < 0)                                                            \
528         return ret;                                                         \
529                                                                             \
530     last_filter = filt_ctx;                                                 \
531     pad_idx = 0;                                                            \
532 } while (0)
533     if (ost->audio_channels_mapped) {
534         int i;
535         AVBPrint pan_buf;
536         av_bprint_init(&pan_buf, 256, 8192);
537         av_bprintf(&pan_buf, "0x%"PRIx64,
538                    av_get_default_channel_layout(ost->audio_channels_mapped));
539         for (i = 0; i < ost->audio_channels_mapped; i++)
540             if (ost->audio_channels_map[i] != -1)
541                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
542
543         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
544         av_bprint_finalize(&pan_buf, NULL);
545     }
546
547     if (codec->channels && !codec->channel_layout)
548         codec->channel_layout = av_get_default_channel_layout(codec->channels);
549
550     sample_fmts     = choose_sample_fmts(ost);
551     sample_rates    = choose_sample_rates(ost);
552     channel_layouts = choose_channel_layouts(ost);
553     if (sample_fmts || sample_rates || channel_layouts) {
554         AVFilterContext *format;
555         char args[256];
556         args[0] = 0;
557
558         if (sample_fmts)
559             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
560                             sample_fmts);
561         if (sample_rates)
562             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
563                             sample_rates);
564         if (channel_layouts)
565             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
566                             channel_layouts);
567
568         av_freep(&sample_fmts);
569         av_freep(&sample_rates);
570         av_freep(&channel_layouts);
571
572         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
573                  ost->file_index, ost->index);
574         ret = avfilter_graph_create_filter(&format,
575                                            avfilter_get_by_name("aformat"),
576                                            name, args, NULL, fg->graph);
577         if (ret < 0)
578             return ret;
579
580         ret = avfilter_link(last_filter, pad_idx, format, 0);
581         if (ret < 0)
582             return ret;
583
584         last_filter = format;
585         pad_idx = 0;
586     }
587
588     if (audio_volume != 256 && 0) {
589         char args[256];
590
591         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
592         AUTO_INSERT_FILTER("-vol", "volume", args);
593     }
594
595     if (ost->apad && of->shortest) {
596         char args[256];
597         int i;
598
599         for (i=0; i<of->ctx->nb_streams; i++)
600             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
601                 break;
602
603         if (i<of->ctx->nb_streams) {
604             snprintf(args, sizeof(args), "%s", ost->apad);
605             AUTO_INSERT_FILTER("-apad", "apad", args);
606         }
607     }
608
609     snprintf(name, sizeof(name), "trim for output stream %d:%d",
610              ost->file_index, ost->index);
611     ret = insert_trim(of->start_time, of->recording_time,
612                       &last_filter, &pad_idx, name);
613     if (ret < 0)
614         return ret;
615
616     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
617         return ret;
618
619     return 0;
620 }
621
622 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
623 {                                                                  \
624     AVFilterContext *ctx = inout->filter_ctx;                      \
625     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
626     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
627     AVIOContext *pb;                                               \
628                                                                    \
629     if (avio_open_dyn_buf(&pb) < 0)                                \
630         exit_program(1);                                           \
631                                                                    \
632     avio_printf(pb, "%s", ctx->filter->name);                      \
633     if (nb_pads > 1)                                               \
634         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
635     avio_w8(pb, 0);                                                \
636     avio_close_dyn_buf(pb, &f->name);                              \
637 }
638
639 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
640 {
641     av_freep(&ofilter->name);
642     DESCRIBE_FILTER_LINK(ofilter, out, 0);
643
644     if (!ofilter->ost) {
645         av_log(NULL, AV_LOG_FATAL, "Filter %s has a unconnected output\n", ofilter->name);
646         exit_program(1);
647     }
648
649     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
650     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
651     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
652     default: av_assert0(0);
653     }
654 }
655
656 static int sub2video_prepare(InputStream *ist)
657 {
658     AVFormatContext *avf = input_files[ist->file_index]->ctx;
659     int i, w, h;
660
661     /* Compute the size of the canvas for the subtitles stream.
662        If the subtitles codec has set a size, use it. Otherwise use the
663        maximum dimensions of the video streams in the same file. */
664     w = ist->dec_ctx->width;
665     h = ist->dec_ctx->height;
666     if (!(w && h)) {
667         for (i = 0; i < avf->nb_streams; i++) {
668             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
669                 w = FFMAX(w, avf->streams[i]->codec->width);
670                 h = FFMAX(h, avf->streams[i]->codec->height);
671             }
672         }
673         if (!(w && h)) {
674             w = FFMAX(w, 720);
675             h = FFMAX(h, 576);
676         }
677         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
678     }
679     ist->sub2video.w = ist->dec_ctx->width  = ist->resample_width  = w;
680     ist->sub2video.h = ist->dec_ctx->height = ist->resample_height = h;
681
682     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
683        palettes for all rectangles are identical or compatible */
684     ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
685
686     ist->sub2video.frame = av_frame_alloc();
687     if (!ist->sub2video.frame)
688         return AVERROR(ENOMEM);
689     ist->sub2video.last_pts = INT64_MIN;
690     return 0;
691 }
692
693 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
694                                         AVFilterInOut *in)
695 {
696     AVFilterContext *last_filter;
697     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
698     InputStream *ist = ifilter->ist;
699     InputFile     *f = input_files[ist->file_index];
700     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
701                                          ist->st->time_base;
702     AVRational fr = ist->framerate;
703     AVRational sar;
704     AVBPrint args;
705     char name[255];
706     int ret, pad_idx = 0;
707     int64_t tsoffset = 0;
708
709     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
710         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
711         return AVERROR(EINVAL);
712     }
713
714     if (!fr.num)
715         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
716
717     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
718         ret = sub2video_prepare(ist);
719         if (ret < 0)
720             return ret;
721     }
722
723     sar = ist->st->sample_aspect_ratio.num ?
724           ist->st->sample_aspect_ratio :
725           ist->dec_ctx->sample_aspect_ratio;
726     if(!sar.den)
727         sar = (AVRational){0,1};
728     av_bprint_init(&args, 0, 1);
729     av_bprintf(&args,
730              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
731              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
732              ist->resample_height,
733              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
734              tb.num, tb.den, sar.num, sar.den,
735              SWS_BILINEAR + ((ist->dec_ctx->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
736     if (fr.num && fr.den)
737         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
738     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
739              ist->file_index, ist->st->index);
740
741     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
742                                             args.str, NULL, fg->graph)) < 0)
743         return ret;
744     last_filter = ifilter->filter;
745
746     if (ist->autorotate) {
747         double theta = get_rotation(ist->st);
748
749         if (fabs(theta - 90) < 1.0) {
750             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
751         } else if (fabs(theta - 180) < 1.0) {
752             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
753             if (ret < 0)
754                 return ret;
755             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
756         } else if (fabs(theta - 270) < 1.0) {
757             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
758         } else if (fabs(theta) > 1.0) {
759             char rotate_buf[64];
760             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
761             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
762         }
763         if (ret < 0)
764             return ret;
765     }
766
767     if (ist->framerate.num) {
768         AVFilterContext *setpts;
769
770         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
771                  ist->file_index, ist->st->index);
772         if ((ret = avfilter_graph_create_filter(&setpts,
773                                                 avfilter_get_by_name("setpts"),
774                                                 name, "N", NULL,
775                                                 fg->graph)) < 0)
776             return ret;
777
778         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
779             return ret;
780
781         last_filter = setpts;
782     }
783
784     if (do_deinterlace) {
785         AVFilterContext *yadif;
786
787         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
788                  ist->file_index, ist->st->index);
789         if ((ret = avfilter_graph_create_filter(&yadif,
790                                                 avfilter_get_by_name("yadif"),
791                                                 name, "", NULL,
792                                                 fg->graph)) < 0)
793             return ret;
794
795         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
796             return ret;
797
798         last_filter = yadif;
799     }
800
801     snprintf(name, sizeof(name), "trim for input stream %d:%d",
802              ist->file_index, ist->st->index);
803     if (copy_ts) {
804         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
805         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
806             tsoffset += f->ctx->start_time;
807     }
808     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
809                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
810                       &last_filter, &pad_idx, name);
811     if (ret < 0)
812         return ret;
813
814     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
815         return ret;
816     return 0;
817 }
818
819 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
820                                         AVFilterInOut *in)
821 {
822     AVFilterContext *last_filter;
823     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
824     InputStream *ist = ifilter->ist;
825     InputFile     *f = input_files[ist->file_index];
826     AVBPrint args;
827     char name[255];
828     int ret, pad_idx = 0;
829     int64_t tsoffset = 0;
830
831     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
832         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
833         return AVERROR(EINVAL);
834     }
835
836     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
837     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
838              1, ist->dec_ctx->sample_rate,
839              ist->dec_ctx->sample_rate,
840              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
841     if (ist->dec_ctx->channel_layout)
842         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
843                    ist->dec_ctx->channel_layout);
844     else
845         av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
846     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
847              ist->file_index, ist->st->index);
848
849     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
850                                             name, args.str, NULL,
851                                             fg->graph)) < 0)
852         return ret;
853     last_filter = ifilter->filter;
854
855 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
856     AVFilterContext *filt_ctx;                                              \
857                                                                             \
858     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
859            "similarly to -af " filter_name "=%s.\n", arg);                  \
860                                                                             \
861     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
862                 fg->index, filter_name, ist->file_index, ist->st->index);   \
863     ret = avfilter_graph_create_filter(&filt_ctx,                           \
864                                        avfilter_get_by_name(filter_name),   \
865                                        name, arg, NULL, fg->graph);         \
866     if (ret < 0)                                                            \
867         return ret;                                                         \
868                                                                             \
869     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
870     if (ret < 0)                                                            \
871         return ret;                                                         \
872                                                                             \
873     last_filter = filt_ctx;                                                 \
874 } while (0)
875
876     if (audio_sync_method > 0) {
877         char args[256] = {0};
878
879         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
880         if (audio_drift_threshold != 0.1)
881             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
882         if (!fg->reconfiguration)
883             av_strlcatf(args, sizeof(args), ":first_pts=0");
884         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
885     }
886
887 //     if (ost->audio_channels_mapped) {
888 //         int i;
889 //         AVBPrint pan_buf;
890 //         av_bprint_init(&pan_buf, 256, 8192);
891 //         av_bprintf(&pan_buf, "0x%"PRIx64,
892 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
893 //         for (i = 0; i < ost->audio_channels_mapped; i++)
894 //             if (ost->audio_channels_map[i] != -1)
895 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
896 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
897 //         av_bprint_finalize(&pan_buf, NULL);
898 //     }
899
900     if (audio_volume != 256) {
901         char args[256];
902
903         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
904                "audio filter instead.\n");
905
906         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
907         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
908     }
909
910     snprintf(name, sizeof(name), "trim for input stream %d:%d",
911              ist->file_index, ist->st->index);
912     if (copy_ts) {
913         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
914         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
915             tsoffset += f->ctx->start_time;
916     }
917     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
918                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
919                       &last_filter, &pad_idx, name);
920     if (ret < 0)
921         return ret;
922
923     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
924         return ret;
925
926     return 0;
927 }
928
929 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
930                                   AVFilterInOut *in)
931 {
932     av_freep(&ifilter->name);
933     DESCRIBE_FILTER_LINK(ifilter, in, 1);
934
935     if (!ifilter->ist->dec) {
936         av_log(NULL, AV_LOG_ERROR,
937                "No decoder for stream #%d:%d, filtering impossible\n",
938                ifilter->ist->file_index, ifilter->ist->st->index);
939         return AVERROR_DECODER_NOT_FOUND;
940     }
941     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
942     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
943     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
944     default: av_assert0(0);
945     }
946 }
947
948 int configure_filtergraph(FilterGraph *fg)
949 {
950     AVFilterInOut *inputs, *outputs, *cur;
951     int ret, i, simple = !fg->graph_desc;
952     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
953                                       fg->graph_desc;
954
955     avfilter_graph_free(&fg->graph);
956     if (!(fg->graph = avfilter_graph_alloc()))
957         return AVERROR(ENOMEM);
958
959     if (simple) {
960         OutputStream *ost = fg->outputs[0]->ost;
961         char args[512];
962         AVDictionaryEntry *e = NULL;
963
964         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
965         fg->graph->scale_sws_opts = av_strdup(args);
966
967         args[0] = 0;
968         while ((e = av_dict_get(ost->swr_opts, "", e,
969                                 AV_DICT_IGNORE_SUFFIX))) {
970             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
971         }
972         if (strlen(args))
973             args[strlen(args)-1] = 0;
974         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
975
976         args[0] = '\0';
977         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
978                                 AV_DICT_IGNORE_SUFFIX))) {
979             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
980         }
981         if (strlen(args))
982             args[strlen(args) - 1] = '\0';
983         fg->graph->resample_lavr_opts = av_strdup(args);
984
985         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
986         if (e)
987             av_opt_set(fg->graph, "threads", e->value, 0);
988     }
989
990     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
991         return ret;
992
993     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
994         const char *num_inputs;
995         const char *num_outputs;
996         if (!outputs) {
997             num_outputs = "0";
998         } else if (outputs->next) {
999             num_outputs = ">1";
1000         } else {
1001             num_outputs = "1";
1002         }
1003         if (!inputs) {
1004             num_inputs = "0";
1005         } else if (inputs->next) {
1006             num_inputs = ">1";
1007         } else {
1008             num_inputs = "1";
1009         }
1010         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1011                "to have exactly 1 input and 1 output."
1012                " However, it had %s input(s) and %s output(s)."
1013                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1014                graph_desc, num_inputs, num_outputs);
1015         return AVERROR(EINVAL);
1016     }
1017
1018     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1019         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1020             avfilter_inout_free(&inputs);
1021             avfilter_inout_free(&outputs);
1022             return ret;
1023         }
1024     avfilter_inout_free(&inputs);
1025
1026     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1027         configure_output_filter(fg, fg->outputs[i], cur);
1028     avfilter_inout_free(&outputs);
1029
1030     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1031         return ret;
1032
1033     fg->reconfiguration = 1;
1034
1035     for (i = 0; i < fg->nb_outputs; i++) {
1036         OutputStream *ost = fg->outputs[i]->ost;
1037         if (ost &&
1038             ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1039             !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
1040             av_buffersink_set_frame_size(ost->filter->filter,
1041                                          ost->enc_ctx->frame_size);
1042     }
1043
1044     return 0;
1045 }
1046
1047 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1048 {
1049     int i;
1050     for (i = 0; i < fg->nb_inputs; i++)
1051         if (fg->inputs[i]->ist == ist)
1052             return 1;
1053     return 0;
1054 }
1055