imgutils: Document av_image_get_buffer_size()
[ffmpeg.git] / avconv_filter.c
1 /*
2  * avconv filter configuration
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; 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 "avconv.h"
24
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/buffersrc.h"
27
28 #include "libavresample/avresample.h"
29
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/display.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/pixdesc.h"
36 #include "libavutil/pixfmt.h"
37 #include "libavutil/samplefmt.h"
38
39 /* Define a function for building a string containing a list of
40  * allowed formats. */
41 #define DEF_CHOOSE_FORMAT(suffix, type, var, supported_list, none, get_name)   \
42 static char *choose_ ## suffix (OutputFilter *ofilter)                         \
43 {                                                                              \
44     if (ofilter->var != none) {                                                \
45         get_name(ofilter->var);                                                \
46         return av_strdup(name);                                                \
47     } else if (ofilter->supported_list) {                                      \
48         const type *p;                                                         \
49         AVIOContext *s = NULL;                                                 \
50         uint8_t *ret;                                                          \
51         int len;                                                               \
52                                                                                \
53         if (avio_open_dyn_buf(&s) < 0)                                         \
54             exit(1);                                                           \
55                                                                                \
56         for (p = ofilter->supported_list; *p != none; p++) {                   \
57             get_name(*p);                                                      \
58             avio_printf(s, "%s|", name);                                       \
59         }                                                                      \
60         len = avio_close_dyn_buf(s, &ret);                                     \
61         ret[len - 1] = 0;                                                      \
62         return ret;                                                            \
63     } else                                                                     \
64         return NULL;                                                           \
65 }
66
67 DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
68                   GET_PIX_FMT_NAME)
69
70 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
71                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
72
73 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
74                   GET_SAMPLE_RATE_NAME)
75
76 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
77                   GET_CH_LAYOUT_NAME)
78
79 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
80 {
81     FilterGraph *fg = av_mallocz(sizeof(*fg));
82
83     if (!fg)
84         exit(1);
85     fg->index = nb_filtergraphs;
86
87     GROW_ARRAY(fg->outputs, fg->nb_outputs);
88     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
89         exit(1);
90     fg->outputs[0]->ost   = ost;
91     fg->outputs[0]->graph = fg;
92     fg->outputs[0]->format = -1;
93
94     ost->filter = fg->outputs[0];
95
96     GROW_ARRAY(fg->inputs, fg->nb_inputs);
97     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
98         exit(1);
99     fg->inputs[0]->ist   = ist;
100     fg->inputs[0]->graph = fg;
101     fg->inputs[0]->format = -1;
102
103     fg->inputs[0]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
104     if (!fg->inputs[0])
105         exit_program(1);
106
107     GROW_ARRAY(ist->filters, ist->nb_filters);
108     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
109
110     GROW_ARRAY(filtergraphs, nb_filtergraphs);
111     filtergraphs[nb_filtergraphs - 1] = fg;
112
113     return 0;
114 }
115
116 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
117 {
118     InputStream *ist = NULL;
119     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
120     int i;
121
122     // TODO: support other filter types
123     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
124         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
125                "currently.\n");
126         exit(1);
127     }
128
129     if (in->name) {
130         AVFormatContext *s;
131         AVStream       *st = NULL;
132         char *p;
133         int file_idx = strtol(in->name, &p, 0);
134
135         if (file_idx < 0 || file_idx >= nb_input_files) {
136             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
137                    file_idx, fg->graph_desc);
138             exit(1);
139         }
140         s = input_files[file_idx]->ctx;
141
142         for (i = 0; i < s->nb_streams; i++) {
143             if (s->streams[i]->codecpar->codec_type != type)
144                 continue;
145             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
146                 st = s->streams[i];
147                 break;
148             }
149         }
150         if (!st) {
151             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
152                    "matches no streams.\n", p, fg->graph_desc);
153             exit(1);
154         }
155         ist = input_streams[input_files[file_idx]->ist_index + st->index];
156     } else {
157         /* find the first unused stream of corresponding type */
158         for (i = 0; i < nb_input_streams; i++) {
159             ist = input_streams[i];
160             if (ist->dec_ctx->codec_type == type && ist->discard)
161                 break;
162         }
163         if (i == nb_input_streams) {
164             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
165                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
166                    in->filter_ctx->name);
167             exit(1);
168         }
169     }
170     av_assert0(ist);
171
172     ist->discard         = 0;
173     ist->decoding_needed = 1;
174     ist->st->discard = AVDISCARD_NONE;
175
176     GROW_ARRAY(fg->inputs, fg->nb_inputs);
177     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
178         exit(1);
179     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
180     fg->inputs[fg->nb_inputs - 1]->graph = fg;
181     fg->inputs[fg->nb_inputs - 1]->format = -1;
182
183     fg->inputs[fg->nb_inputs - 1]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
184     if (!fg->inputs[fg->nb_inputs - 1]->frame_queue)
185         exit_program(1);
186
187     GROW_ARRAY(ist->filters, ist->nb_filters);
188     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
189 }
190
191 int init_complex_filtergraph(FilterGraph *fg)
192 {
193     AVFilterInOut *inputs, *outputs, *cur;
194     AVFilterGraph *graph;
195     int ret = 0;
196
197     /* this graph is only used for determining the kinds of inputs
198      * and outputs we have, and is discarded on exit from this function */
199     graph = avfilter_graph_alloc();
200     if (!graph)
201         return AVERROR(ENOMEM);
202
203     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
204     if (ret < 0)
205         goto fail;
206
207     for (cur = inputs; cur; cur = cur->next)
208         init_input_filter(fg, cur);
209
210     for (cur = outputs; cur;) {
211         GROW_ARRAY(fg->outputs, fg->nb_outputs);
212         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
213         if (!fg->outputs[fg->nb_outputs - 1])
214             exit(1);
215
216         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
217         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
218         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
219                                                                          cur->pad_idx);
220         cur = cur->next;
221         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
222     }
223
224 fail:
225     avfilter_inout_free(&inputs);
226     avfilter_graph_free(&graph);
227     return ret;
228 }
229
230 static int insert_trim(int64_t start_time, int64_t duration,
231                        AVFilterContext **last_filter, int *pad_idx,
232                        const char *filter_name)
233 {
234     AVFilterGraph *graph = (*last_filter)->graph;
235     AVFilterContext *ctx;
236     const AVFilter *trim;
237     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
238     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
239     int ret = 0;
240
241     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
242         return 0;
243
244     trim = avfilter_get_by_name(name);
245     if (!trim) {
246         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
247                "recording time.\n", name);
248         return AVERROR_FILTER_NOT_FOUND;
249     }
250
251     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
252     if (!ctx)
253         return AVERROR(ENOMEM);
254
255     if (duration != INT64_MAX) {
256         ret = av_opt_set_double(ctx, "duration", (double)duration / 1e6,
257                                 AV_OPT_SEARCH_CHILDREN);
258     }
259     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
260         ret = av_opt_set_double(ctx, "start", (double)start_time / 1e6,
261                                 AV_OPT_SEARCH_CHILDREN);
262     }
263     if (ret < 0) {
264         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
265         return ret;
266     }
267
268     ret = avfilter_init_str(ctx, NULL);
269     if (ret < 0)
270         return ret;
271
272     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
273     if (ret < 0)
274         return ret;
275
276     *last_filter = ctx;
277     *pad_idx     = 0;
278     return 0;
279 }
280
281 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
282                          const char *filter_name, const char *args)
283 {
284     AVFilterGraph *graph = (*last_filter)->graph;
285     AVFilterContext *ctx;
286     int ret;
287
288     ret = avfilter_graph_create_filter(&ctx,
289                                        avfilter_get_by_name(filter_name),
290                                        filter_name, args, NULL, graph);
291     if (ret < 0)
292         return ret;
293
294     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
295     if (ret < 0)
296         return ret;
297
298     *last_filter = ctx;
299     *pad_idx     = 0;
300     return 0;
301 }
302
303 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
304 {
305     char *pix_fmts;
306     OutputStream *ost = ofilter->ost;
307     OutputFile    *of = output_files[ost->file_index];
308     AVFilterContext *last_filter = out->filter_ctx;
309     int pad_idx = out->pad_idx;
310     int ret;
311     char name[255];
312
313     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
314     ret = avfilter_graph_create_filter(&ofilter->filter,
315                                        avfilter_get_by_name("buffersink"),
316                                        name, NULL, NULL, fg->graph);
317     if (ret < 0)
318         return ret;
319
320     if (ofilter->width || ofilter->height) {
321         char args[255];
322         AVFilterContext *filter;
323
324         snprintf(args, sizeof(args), "%d:%d:0x%X",
325                  ofilter->width, ofilter->height,
326                  (unsigned)ost->sws_flags);
327         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
328                  ost->file_index, ost->index);
329         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
330                                                 name, args, NULL, fg->graph)) < 0)
331             return ret;
332         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
333             return ret;
334
335         last_filter = filter;
336         pad_idx = 0;
337     }
338
339     if ((pix_fmts = choose_pix_fmts(ofilter))) {
340         AVFilterContext *filter;
341         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
342                  ost->file_index, ost->index);
343         ret = avfilter_graph_create_filter(&filter,
344                                            avfilter_get_by_name("format"),
345                                            "format", pix_fmts, NULL, fg->graph);
346         av_freep(&pix_fmts);
347         if (ret < 0)
348             return ret;
349         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
350             return ret;
351
352         last_filter = filter;
353         pad_idx     = 0;
354     }
355
356     if (ost->frame_rate.num) {
357         AVFilterContext *fps;
358         char args[255];
359
360         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
361                  ost->frame_rate.den);
362         snprintf(name, sizeof(name), "fps for output stream %d:%d",
363                  ost->file_index, ost->index);
364         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
365                                            name, args, NULL, fg->graph);
366         if (ret < 0)
367             return ret;
368
369         ret = avfilter_link(last_filter, pad_idx, fps, 0);
370         if (ret < 0)
371             return ret;
372         last_filter = fps;
373         pad_idx = 0;
374     }
375
376     snprintf(name, sizeof(name), "trim for output stream %d:%d",
377              ost->file_index, ost->index);
378     ret = insert_trim(of->start_time, of->recording_time,
379                       &last_filter, &pad_idx, name);
380     if (ret < 0)
381         return ret;
382
383
384     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
385         return ret;
386
387     return 0;
388 }
389
390 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
391 {
392     OutputStream *ost = ofilter->ost;
393     OutputFile    *of = output_files[ost->file_index];
394     AVCodecContext *codec  = ost->enc_ctx;
395     AVFilterContext *last_filter = out->filter_ctx;
396     int pad_idx = out->pad_idx;
397     char *sample_fmts, *sample_rates, *channel_layouts;
398     char name[255];
399     int ret;
400
401
402     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
403     ret = avfilter_graph_create_filter(&ofilter->filter,
404                                        avfilter_get_by_name("abuffersink"),
405                                        name, NULL, NULL, fg->graph);
406     if (ret < 0)
407         return ret;
408
409     if (codec->channels && !codec->channel_layout)
410         codec->channel_layout = av_get_default_channel_layout(codec->channels);
411
412     sample_fmts     = choose_sample_fmts(ofilter);
413     sample_rates    = choose_sample_rates(ofilter);
414     channel_layouts = choose_channel_layouts(ofilter);
415     if (sample_fmts || sample_rates || channel_layouts) {
416         AVFilterContext *format;
417         char args[256];
418         int len = 0;
419
420         if (sample_fmts)
421             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
422                             sample_fmts);
423         if (sample_rates)
424             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
425                             sample_rates);
426         if (channel_layouts)
427             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
428                             channel_layouts);
429         args[len - 1] = 0;
430
431         av_freep(&sample_fmts);
432         av_freep(&sample_rates);
433         av_freep(&channel_layouts);
434
435         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
436                  ost->file_index, ost->index);
437         ret = avfilter_graph_create_filter(&format,
438                                            avfilter_get_by_name("aformat"),
439                                            name, args, NULL, fg->graph);
440         if (ret < 0)
441             return ret;
442
443         ret = avfilter_link(last_filter, pad_idx, format, 0);
444         if (ret < 0)
445             return ret;
446
447         last_filter = format;
448         pad_idx = 0;
449     }
450
451     snprintf(name, sizeof(name), "trim for output stream %d:%d",
452              ost->file_index, ost->index);
453     ret = insert_trim(of->start_time, of->recording_time,
454                       &last_filter, &pad_idx, name);
455     if (ret < 0)
456         return ret;
457
458     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
459         return ret;
460
461     return 0;
462 }
463
464 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
465 {                                                                  \
466     AVFilterContext *ctx = inout->filter_ctx;                      \
467     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
468     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
469     AVIOContext *pb;                                               \
470                                                                    \
471     if (avio_open_dyn_buf(&pb) < 0)                                \
472         exit(1);                                                   \
473                                                                    \
474     avio_printf(pb, "%s", ctx->filter->name);                      \
475     if (nb_pads > 1)                                               \
476         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
477     avio_w8(pb, 0);                                                \
478     avio_close_dyn_buf(pb, &f->name);                              \
479 }
480
481 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
482 {
483     av_freep(&ofilter->name);
484     DESCRIBE_FILTER_LINK(ofilter, out, 0);
485
486     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
487     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
488     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
489     default: av_assert0(0);
490     }
491 }
492
493 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
494                                         AVFilterInOut *in)
495 {
496     AVFilterContext *last_filter;
497     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
498     InputStream *ist = ifilter->ist;
499     InputFile     *f = input_files[ist->file_index];
500     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
501                                          ist->st->time_base;
502     AVBufferSrcParameters *par;
503     char name[255];
504     int ret, pad_idx = 0;
505
506     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
507              ist->file_index, ist->st->index);
508
509     ifilter->filter = avfilter_graph_alloc_filter(fg->graph, buffer_filt, name);
510     if (!ifilter->filter)
511         return AVERROR(ENOMEM);
512
513     par = av_buffersrc_parameters_alloc();
514     if (!par)
515         return AVERROR(ENOMEM);
516
517     par->sample_aspect_ratio = ifilter->sample_aspect_ratio;
518     par->width               = ifilter->width;
519     par->height              = ifilter->height;
520     par->format              = ifilter->format;
521     par->time_base           = tb;
522     if (ist->framerate.num)
523         par->frame_rate      = ist->framerate;
524     par->hw_frames_ctx       = ifilter->hw_frames_ctx;
525
526     ret = av_buffersrc_parameters_set(ifilter->filter, par);
527     av_freep(&par);
528     if (ret < 0)
529         return ret;
530
531     ret = avfilter_init_str(ifilter->filter, NULL);
532     if (ret < 0)
533         return ret;
534
535     last_filter = ifilter->filter;
536
537     if (ist->autorotate) {
538         uint8_t* displaymatrix = av_stream_get_side_data(ist->st,
539                                                          AV_PKT_DATA_DISPLAYMATRIX, NULL);
540         if (displaymatrix) {
541             double rot = av_display_rotation_get((int32_t*) displaymatrix);
542             if (rot < -135 || rot > 135) {
543                 ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
544                 if (ret < 0)
545                     return ret;
546                 ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
547             } else if (rot < -45) {
548                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=clock");
549             } else if (rot > 45) {
550                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=cclock");
551             }
552             if (ret < 0)
553                 return ret;
554         }
555     }
556
557     snprintf(name, sizeof(name), "trim for input stream %d:%d",
558              ist->file_index, ist->st->index);
559     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
560                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
561     if (ret < 0)
562         return ret;
563
564     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
565         return ret;
566     return 0;
567 }
568
569 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
570                                         AVFilterInOut *in)
571 {
572     AVFilterContext *last_filter;
573     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
574     InputStream *ist = ifilter->ist;
575     InputFile     *f = input_files[ist->file_index];
576     AVBufferSrcParameters *par;
577     char args[255], name[255];
578     int ret, pad_idx = 0;
579
580     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
581              ist->file_index, ist->st->index);
582
583     ifilter->filter = avfilter_graph_alloc_filter(fg->graph, abuffer_filt, name);
584     if (!ifilter->filter)
585         return AVERROR(ENOMEM);
586
587     par = av_buffersrc_parameters_alloc();
588     if (!par)
589         return AVERROR(ENOMEM);
590
591     par->time_base      = (AVRational){ 1, ifilter->sample_rate };
592     par->sample_rate    = ifilter->sample_rate;
593     par->format         = ifilter->format;
594     par->channel_layout = ifilter->channel_layout;
595
596     ret = av_buffersrc_parameters_set(ifilter->filter, par);
597     av_freep(&par);
598     if (ret < 0)
599         return ret;
600
601     ret = avfilter_init_str(ifilter->filter, NULL);
602     if (ret < 0)
603         return ret;
604     last_filter = ifilter->filter;
605
606     if (audio_sync_method > 0) {
607         AVFilterContext *async;
608         int  len = 0;
609
610         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
611                "asyncts audio filter instead.\n");
612
613         if (audio_sync_method > 1)
614             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
615                             "max_comp=%d:", audio_sync_method);
616         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
617                  audio_drift_threshold);
618
619         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
620                  fg->index, ist->file_index, ist->st->index);
621         ret = avfilter_graph_create_filter(&async,
622                                            avfilter_get_by_name("asyncts"),
623                                            name, args, NULL, fg->graph);
624         if (ret < 0)
625             return ret;
626
627         ret = avfilter_link(last_filter, 0, async, 0);
628         if (ret < 0)
629             return ret;
630
631         last_filter = async;
632     }
633     if (audio_volume != 256) {
634         AVFilterContext *volume;
635
636         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
637                "audio filter instead.\n");
638
639         snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
640
641         snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
642                  fg->index, ist->file_index, ist->st->index);
643         ret = avfilter_graph_create_filter(&volume,
644                                            avfilter_get_by_name("volume"),
645                                            name, args, NULL, fg->graph);
646         if (ret < 0)
647             return ret;
648
649         ret = avfilter_link(last_filter, 0, volume, 0);
650         if (ret < 0)
651             return ret;
652
653         last_filter = volume;
654     }
655
656     snprintf(name, sizeof(name), "trim for input stream %d:%d",
657              ist->file_index, ist->st->index);
658     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
659                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
660     if (ret < 0)
661         return ret;
662
663     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
664         return ret;
665
666     return 0;
667 }
668
669 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
670                                   AVFilterInOut *in)
671 {
672     av_freep(&ifilter->name);
673     DESCRIBE_FILTER_LINK(ifilter, in, 1);
674
675     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
676     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
677     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
678     default: av_assert0(0);
679     }
680 }
681
682 int configure_filtergraph(FilterGraph *fg)
683 {
684     AVFilterInOut *inputs, *outputs, *cur;
685     int ret, i, simple = filtergraph_is_simple(fg);
686     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
687                                       fg->graph_desc;
688
689     avfilter_graph_free(&fg->graph);
690     if (!(fg->graph = avfilter_graph_alloc()))
691         return AVERROR(ENOMEM);
692
693     if (simple) {
694         OutputStream *ost = fg->outputs[0]->ost;
695         char args[512];
696         AVDictionaryEntry *e = NULL;
697
698         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
699         fg->graph->scale_sws_opts = av_strdup(args);
700
701         args[0] = '\0';
702         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
703                                 AV_DICT_IGNORE_SUFFIX))) {
704             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
705         }
706         if (strlen(args))
707             args[strlen(args) - 1] = '\0';
708         fg->graph->resample_lavr_opts = av_strdup(args);
709     }
710
711     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
712         goto fail;
713
714     if (hw_device_ctx) {
715         for (i = 0; i < fg->graph->nb_filters; i++) {
716             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
717         }
718     }
719
720     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
721         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
722                "exactly one input and output.\n", graph_desc);
723         ret = AVERROR(EINVAL);
724         goto fail;
725     }
726
727     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
728         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
729             goto fail;
730     avfilter_inout_free(&inputs);
731
732     for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
733         OutputFilter *ofilter = fg->outputs[i];
734         if (ofilter->ost)
735             configure_output_filter(fg, ofilter, cur);
736     }
737
738     avfilter_inout_free(&outputs);
739
740     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
741         goto fail;
742
743     /* limit the lists of allowed formats to the ones selected, to
744      * make sure they stay the same if the filtergraph is reconfigured later */
745     for (i = 0; i < fg->nb_outputs; i++) {
746         OutputFilter *ofilter = fg->outputs[i];
747         AVFilterLink *link = ofilter->filter->inputs[0];
748
749         ofilter->format = link->format;
750
751         ofilter->width  = link->w;
752         ofilter->height = link->h;
753
754         ofilter->sample_rate    = link->sample_rate;
755         ofilter->channel_layout = link->channel_layout;
756     }
757
758     for (i = 0; i < fg->nb_inputs; i++) {
759         while (av_fifo_size(fg->inputs[i]->frame_queue)) {
760             AVFrame *tmp;
761             av_fifo_generic_read(fg->inputs[i]->frame_queue, &tmp, sizeof(tmp), NULL);
762             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, tmp);
763             av_frame_free(&tmp);
764             if (ret < 0)
765                 goto fail;
766         }
767     }
768
769     /* send the EOFs for the finished inputs */
770     for (i = 0; i < fg->nb_inputs; i++) {
771         if (fg->inputs[i]->eof) {
772             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, NULL);
773             if (ret < 0)
774                 goto fail;
775         }
776     }
777
778     return 0;
779 fail:
780     avfilter_graph_free(&fg->graph);
781     return ret;
782 }
783
784 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
785 {
786     av_buffer_unref(&ifilter->hw_frames_ctx);
787
788     ifilter->format = frame->format;
789
790     ifilter->width               = frame->width;
791     ifilter->height              = frame->height;
792     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
793
794     ifilter->sample_rate         = frame->sample_rate;
795     ifilter->channel_layout      = frame->channel_layout;
796
797     if (frame->hw_frames_ctx) {
798         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
799         if (!ifilter->hw_frames_ctx)
800             return AVERROR(ENOMEM);
801     }
802
803     return 0;
804 }
805
806 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
807 {
808     int i;
809     for (i = 0; i < fg->nb_inputs; i++)
810         if (fg->inputs[i]->ist == ist)
811             return 1;
812     return 0;
813 }
814
815 int filtergraph_is_simple(FilterGraph *fg)
816 {
817     return !fg->graph_desc;
818 }