avconv: remove an unused variable
[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 "avconv.h"
22
23 #include "libavfilter/avfilter.h"
24 #include "libavfilter/avfiltergraph.h"
25
26 #include "libavresample/avresample.h"
27
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/pixdesc.h"
33 #include "libavutil/pixfmt.h"
34 #include "libavutil/samplefmt.h"
35
36 /* Define a function for building a string containing a list of
37  * allowed formats. */
38 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
39 static char *choose_ ## var ## s(OutputStream *ost)                            \
40 {                                                                              \
41     if (ost->st->codec->var != none) {                                         \
42         get_name(ost->st->codec->var);                                         \
43         return av_strdup(name);                                                \
44     } else if (ost->enc->supported_list) {                                     \
45         const type *p;                                                         \
46         AVIOContext *s = NULL;                                                 \
47         uint8_t *ret;                                                          \
48         int len;                                                               \
49                                                                                \
50         if (avio_open_dyn_buf(&s) < 0)                                         \
51             exit(1);                                                           \
52                                                                                \
53         for (p = ost->enc->supported_list; *p != none; p++) {                  \
54             get_name(*p);                                                      \
55             avio_printf(s, "%s" separator, name);                              \
56         }                                                                      \
57         len = avio_close_dyn_buf(s, &ret);                                     \
58         ret[len - 1] = 0;                                                      \
59         return ret;                                                            \
60     } else                                                                     \
61         return NULL;                                                           \
62 }
63
64 DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
65                   GET_PIX_FMT_NAME, ":")
66
67 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
68                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
69
70 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
71                   GET_SAMPLE_RATE_NAME, ",")
72
73 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
74                   GET_CH_LAYOUT_NAME, ",")
75
76 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
77 {
78     FilterGraph *fg = av_mallocz(sizeof(*fg));
79
80     if (!fg)
81         exit(1);
82     fg->index = nb_filtergraphs;
83
84     GROW_ARRAY(fg->outputs, fg->nb_outputs);
85     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
86         exit(1);
87     fg->outputs[0]->ost   = ost;
88     fg->outputs[0]->graph = fg;
89
90     ost->filter = fg->outputs[0];
91
92     GROW_ARRAY(fg->inputs, fg->nb_inputs);
93     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
94         exit(1);
95     fg->inputs[0]->ist   = ist;
96     fg->inputs[0]->graph = fg;
97
98     GROW_ARRAY(ist->filters, ist->nb_filters);
99     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
100
101     GROW_ARRAY(filtergraphs, nb_filtergraphs);
102     filtergraphs[nb_filtergraphs - 1] = fg;
103
104     return fg;
105 }
106
107 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
108 {
109     InputStream *ist = NULL;
110     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
111     int i;
112
113     // TODO: support other filter types
114     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
115         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
116                "currently.\n");
117         exit(1);
118     }
119
120     if (in->name) {
121         AVFormatContext *s;
122         AVStream       *st = NULL;
123         char *p;
124         int file_idx = strtol(in->name, &p, 0);
125
126         if (file_idx < 0 || file_idx >= nb_input_files) {
127             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
128                    file_idx, fg->graph_desc);
129             exit(1);
130         }
131         s = input_files[file_idx]->ctx;
132
133         for (i = 0; i < s->nb_streams; i++) {
134             if (s->streams[i]->codec->codec_type != type)
135                 continue;
136             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
137                 st = s->streams[i];
138                 break;
139             }
140         }
141         if (!st) {
142             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
143                    "matches no streams.\n", p, fg->graph_desc);
144             exit(1);
145         }
146         ist = input_streams[input_files[file_idx]->ist_index + st->index];
147     } else {
148         /* find the first unused stream of corresponding type */
149         for (i = 0; i < nb_input_streams; i++) {
150             ist = input_streams[i];
151             if (ist->st->codec->codec_type == type && ist->discard)
152                 break;
153         }
154         if (i == nb_input_streams) {
155             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
156                    "unlabeled input pad %d on filter %s", in->pad_idx,
157                    in->filter_ctx->name);
158             exit(1);
159         }
160     }
161     av_assert0(ist);
162
163     ist->discard         = 0;
164     ist->decoding_needed = 1;
165     ist->st->discard = AVDISCARD_NONE;
166
167     GROW_ARRAY(fg->inputs, fg->nb_inputs);
168     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
169         exit(1);
170     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
171     fg->inputs[fg->nb_inputs - 1]->graph = fg;
172
173     GROW_ARRAY(ist->filters, ist->nb_filters);
174     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
175 }
176
177 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
178 {
179     char *pix_fmts;
180     OutputStream *ost = ofilter->ost;
181     AVCodecContext *codec = ost->st->codec;
182     AVFilterContext *last_filter = out->filter_ctx;
183     int pad_idx = out->pad_idx;
184     int ret;
185     char name[255];
186
187     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
188     ret = avfilter_graph_create_filter(&ofilter->filter,
189                                        avfilter_get_by_name("buffersink"),
190                                        name, NULL, NULL, fg->graph);
191     if (ret < 0)
192         return ret;
193
194     if (codec->width || codec->height) {
195         char args[255];
196         AVFilterContext *filter;
197
198         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
199                  codec->width,
200                  codec->height,
201                  (unsigned)ost->sws_flags);
202         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
203                  ost->file_index, ost->index);
204         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
205                                                 name, args, NULL, fg->graph)) < 0)
206             return ret;
207         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
208             return ret;
209
210         last_filter = filter;
211         pad_idx = 0;
212     }
213
214     if ((pix_fmts = choose_pix_fmts(ost))) {
215         AVFilterContext *filter;
216         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
217                  ost->file_index, ost->index);
218         if ((ret = avfilter_graph_create_filter(&filter,
219                                                 avfilter_get_by_name("format"),
220                                                 "format", pix_fmts, NULL,
221                                                 fg->graph)) < 0)
222             return ret;
223         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
224             return ret;
225
226         last_filter = filter;
227         pad_idx     = 0;
228         av_freep(&pix_fmts);
229     }
230
231     if (ost->frame_rate.num) {
232         AVFilterContext *fps;
233         char args[255];
234
235         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
236                  ost->frame_rate.den);
237         snprintf(name, sizeof(name), "fps for output stream %d:%d",
238                  ost->file_index, ost->index);
239         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
240                                            name, args, NULL, fg->graph);
241         if (ret < 0)
242             return ret;
243
244         ret = avfilter_link(last_filter, pad_idx, fps, 0);
245         if (ret < 0)
246             return ret;
247         last_filter = fps;
248         pad_idx = 0;
249     }
250
251     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
252         return ret;
253
254     return 0;
255 }
256
257 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
258 {
259     OutputStream *ost = ofilter->ost;
260     AVCodecContext *codec  = ost->st->codec;
261     AVFilterContext *last_filter = out->filter_ctx;
262     int pad_idx = out->pad_idx;
263     char *sample_fmts, *sample_rates, *channel_layouts;
264     char name[255];
265     int ret;
266
267
268     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
269     ret = avfilter_graph_create_filter(&ofilter->filter,
270                                        avfilter_get_by_name("abuffersink"),
271                                        name, NULL, NULL, fg->graph);
272     if (ret < 0)
273         return ret;
274
275     if (codec->channels && !codec->channel_layout)
276         codec->channel_layout = av_get_default_channel_layout(codec->channels);
277
278     sample_fmts     = choose_sample_fmts(ost);
279     sample_rates    = choose_sample_rates(ost);
280     channel_layouts = choose_channel_layouts(ost);
281     if (sample_fmts || sample_rates || channel_layouts) {
282         AVFilterContext *format;
283         char args[256];
284         int len = 0;
285
286         if (sample_fmts)
287             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
288                             sample_fmts);
289         if (sample_rates)
290             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
291                             sample_rates);
292         if (channel_layouts)
293             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
294                             channel_layouts);
295         args[len - 1] = 0;
296
297         av_freep(&sample_fmts);
298         av_freep(&sample_rates);
299         av_freep(&channel_layouts);
300
301         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
302                  ost->file_index, ost->index);
303         ret = avfilter_graph_create_filter(&format,
304                                            avfilter_get_by_name("aformat"),
305                                            name, args, NULL, fg->graph);
306         if (ret < 0)
307             return ret;
308
309         ret = avfilter_link(last_filter, pad_idx, format, 0);
310         if (ret < 0)
311             return ret;
312
313         last_filter = format;
314         pad_idx = 0;
315     }
316
317     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
318         return ret;
319
320     return 0;
321 }
322
323 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
324 {                                                                  \
325     AVFilterContext *ctx = inout->filter_ctx;                      \
326     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
327     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
328     AVIOContext *pb;                                               \
329                                                                    \
330     if (avio_open_dyn_buf(&pb) < 0)                                \
331         exit(1);                                                   \
332                                                                    \
333     avio_printf(pb, "%s", ctx->filter->name);                      \
334     if (nb_pads > 1)                                               \
335         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
336     avio_w8(pb, 0);                                                \
337     avio_close_dyn_buf(pb, &f->name);                              \
338 }
339
340 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
341 {
342     av_freep(&ofilter->name);
343     DESCRIBE_FILTER_LINK(ofilter, out, 0);
344
345     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
346     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
347     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
348     default: av_assert0(0);
349     }
350 }
351
352 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
353                                         AVFilterInOut *in)
354 {
355     AVFilterContext *first_filter = in->filter_ctx;
356     AVFilter *filter = avfilter_get_by_name("buffer");
357     InputStream *ist = ifilter->ist;
358     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
359                                          ist->st->time_base;
360     AVRational sar;
361     char args[255], name[255];
362     int pad_idx = in->pad_idx;
363     int ret;
364
365     sar = ist->st->sample_aspect_ratio.num ?
366           ist->st->sample_aspect_ratio :
367           ist->st->codec->sample_aspect_ratio;
368     snprintf(args, sizeof(args), "%d:%d:%d:%d:%d:%d:%d", ist->st->codec->width,
369              ist->st->codec->height, ist->st->codec->pix_fmt,
370              tb.num, tb.den, sar.num, sar.den);
371     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
372              ist->file_index, ist->st->index);
373
374     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
375                                             args, NULL, fg->graph)) < 0)
376         return ret;
377
378     if (ist->framerate.num) {
379         AVFilterContext *setpts;
380
381         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
382                  ist->file_index, ist->st->index);
383         if ((ret = avfilter_graph_create_filter(&setpts,
384                                                 avfilter_get_by_name("setpts"),
385                                                 name, "N", NULL,
386                                                 fg->graph)) < 0)
387             return ret;
388
389         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
390             return ret;
391
392         first_filter = setpts;
393         pad_idx = 0;
394     }
395
396     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
397         return ret;
398     return 0;
399 }
400
401 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
402                                         AVFilterInOut *in)
403 {
404     AVFilterContext *first_filter = in->filter_ctx;
405     AVFilter *filter = avfilter_get_by_name("abuffer");
406     InputStream *ist = ifilter->ist;
407     int pad_idx = in->pad_idx;
408     char args[255], name[255];
409     int ret;
410
411     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
412              ":channel_layout=0x%"PRIx64,
413              1, ist->st->codec->sample_rate,
414              ist->st->codec->sample_rate,
415              av_get_sample_fmt_name(ist->st->codec->sample_fmt),
416              ist->st->codec->channel_layout);
417     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
418              ist->file_index, ist->st->index);
419
420     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
421                                             name, args, NULL,
422                                             fg->graph)) < 0)
423         return ret;
424
425     if (audio_sync_method > 0) {
426         AVFilterContext *async;
427         int  len = 0;
428
429         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
430                "asyncts audio filter instead.\n");
431
432         if (audio_sync_method > 1)
433             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
434                             "max_comp=%d:", audio_sync_method);
435         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
436                  audio_drift_threshold);
437
438         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
439                  fg->index, ist->file_index, ist->st->index);
440         ret = avfilter_graph_create_filter(&async,
441                                            avfilter_get_by_name("asyncts"),
442                                            name, args, NULL, fg->graph);
443         if (ret < 0)
444             return ret;
445
446         ret = avfilter_link(async, 0, first_filter, pad_idx);
447         if (ret < 0)
448             return ret;
449
450         first_filter = async;
451         pad_idx = 0;
452     }
453     if (audio_volume != 256) {
454         AVFilterContext *volume;
455
456         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
457                "audio filter instead.\n");
458
459         snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
460
461         snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
462                  fg->index, ist->file_index, ist->st->index);
463         ret = avfilter_graph_create_filter(&volume,
464                                            avfilter_get_by_name("volume"),
465                                            name, args, NULL, fg->graph);
466         if (ret < 0)
467             return ret;
468
469         ret = avfilter_link(volume, 0, first_filter, pad_idx);
470         if (ret < 0)
471             return ret;
472
473         first_filter = volume;
474         pad_idx = 0;
475     }
476     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
477         return ret;
478
479     return 0;
480 }
481
482 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
483                                   AVFilterInOut *in)
484 {
485     av_freep(&ifilter->name);
486     DESCRIBE_FILTER_LINK(ifilter, in, 1);
487
488     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
489     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
490     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
491     default: av_assert0(0);
492     }
493 }
494
495 int configure_filtergraph(FilterGraph *fg)
496 {
497     AVFilterInOut *inputs, *outputs, *cur;
498     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
499     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
500                                       fg->graph_desc;
501
502     avfilter_graph_free(&fg->graph);
503     if (!(fg->graph = avfilter_graph_alloc()))
504         return AVERROR(ENOMEM);
505
506     if (simple) {
507         OutputStream *ost = fg->outputs[0]->ost;
508         char args[512];
509         AVDictionaryEntry *e = NULL;
510
511         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
512         fg->graph->scale_sws_opts = av_strdup(args);
513
514         args[0] = '\0';
515         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
516                                 AV_DICT_IGNORE_SUFFIX))) {
517             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
518         }
519         if (strlen(args))
520             args[strlen(args) - 1] = '\0';
521         fg->graph->resample_lavr_opts = av_strdup(args);
522     }
523
524     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
525         return ret;
526
527     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
528         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
529                "exactly one input and output.\n", graph_desc);
530         return AVERROR(EINVAL);
531     }
532
533     for (cur = inputs; !simple && init && cur; cur = cur->next)
534         init_input_filter(fg, cur);
535
536     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
537         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
538             return ret;
539     avfilter_inout_free(&inputs);
540
541     if (!init || simple) {
542         /* we already know the mappings between lavfi outputs and output streams,
543          * so we can finish the setup */
544         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
545             configure_output_filter(fg, fg->outputs[i], cur);
546         avfilter_inout_free(&outputs);
547
548         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
549             return ret;
550     } else {
551         /* wait until output mappings are processed */
552         for (cur = outputs; cur;) {
553             GROW_ARRAY(fg->outputs, fg->nb_outputs);
554             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
555                 exit(1);
556             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
557             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
558             cur = cur->next;
559             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
560         }
561     }
562
563     return 0;
564 }
565
566 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
567 {
568     int i;
569     for (i = 0; i < fg->nb_inputs; i++)
570         if (fg->inputs[i]->ist == ist)
571             return 1;
572     return 0;
573 }
574