avconv: split configuring filter configuration to a separate file.
[libav.git] / avconv_filter.c
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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 "libavutil/audioconvert.h"
27#include "libavutil/avassert.h"
28#include "libavutil/pixdesc.h"
29#include "libavutil/pixfmt.h"
30#include "libavutil/samplefmt.h"
31
32/**
33 * Define a function for building a string containing a list of
34 * allowed formats,
35 */
36#define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
37static char *choose_ ## var ## s(OutputStream *ost) \
38{ \
39 if (ost->st->codec->var != none) { \
40 get_name(ost->st->codec->var); \
41 return av_strdup(name); \
42 } else if (ost->enc->supported_list) { \
43 const type *p; \
44 AVIOContext *s = NULL; \
45 uint8_t *ret; \
46 int len; \
47 \
48 if (avio_open_dyn_buf(&s) < 0) \
49 exit_program(1); \
50 \
51 for (p = ost->enc->supported_list; *p != none; p++) { \
52 get_name(*p); \
53 avio_printf(s, "%s" separator, name); \
54 } \
55 len = avio_close_dyn_buf(s, &ret); \
56 ret[len - 1] = 0; \
57 return ret; \
58 } else \
59 return NULL; \
60}
61
62#define GET_PIX_FMT_NAME(pix_fmt)\
63 const char *name = av_get_pix_fmt_name(pix_fmt);
64
65DEF_CHOOSE_FORMAT(enum PixelFormat, pix_fmt, pix_fmts, PIX_FMT_NONE,
66 GET_PIX_FMT_NAME, ":")
67
68#define GET_SAMPLE_FMT_NAME(sample_fmt)\
69 const char *name = av_get_sample_fmt_name(sample_fmt)
70
71DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
72 AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
73
74#define GET_SAMPLE_RATE_NAME(rate)\
75 char name[16];\
76 snprintf(name, sizeof(name), "%d", rate);
77
78DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
79 GET_SAMPLE_RATE_NAME, ",")
80
81#define GET_CH_LAYOUT_NAME(ch_layout)\
82 char name[16];\
83 snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
84
85DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
86 GET_CH_LAYOUT_NAME, ",")
87
88FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
89{
90 FilterGraph *fg = av_mallocz(sizeof(*fg));
91
92 if (!fg)
93 exit_program(1);
94 fg->index = nb_filtergraphs;
95
96 fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
97 fg->nb_outputs + 1);
98 if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
99 exit_program(1);
100 fg->outputs[0]->ost = ost;
101 fg->outputs[0]->graph = fg;
102
103 ost->filter = fg->outputs[0];
104
105 fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
106 fg->nb_inputs + 1);
107 if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
108 exit_program(1);
109 fg->inputs[0]->ist = ist;
110 fg->inputs[0]->graph = fg;
111
112 ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
113 &ist->nb_filters, ist->nb_filters + 1);
114 ist->filters[ist->nb_filters - 1] = fg->inputs[0];
115
116 filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
117 &nb_filtergraphs, nb_filtergraphs + 1);
118 filtergraphs[nb_filtergraphs - 1] = fg;
119
120 return fg;
121}
122
123static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
124{
125 InputStream *ist = NULL;
126 enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
127 int i;
128
129 // TODO: support other filter types
130 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
131 av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
132 "currently.\n");
133 exit_program(1);
134 }
135
136 if (in->name) {
137 AVFormatContext *s;
138 AVStream *st = NULL;
139 char *p;
140 int file_idx = strtol(in->name, &p, 0);
141
142 if (file_idx < 0 || file_idx >= nb_input_files) {
143 av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
144 file_idx, fg->graph_desc);
145 exit_program(1);
146 }
147 s = input_files[file_idx]->ctx;
148
149 for (i = 0; i < s->nb_streams; i++) {
150 if (s->streams[i]->codec->codec_type != type)
151 continue;
152 if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
153 st = s->streams[i];
154 break;
155 }
156 }
157 if (!st) {
158 av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
159 "matches no streams.\n", p, fg->graph_desc);
160 exit_program(1);
161 }
162 ist = input_streams[input_files[file_idx]->ist_index + st->index];
163 } else {
164 /* find the first unused stream of corresponding type */
165 for (i = 0; i < nb_input_streams; i++) {
166 ist = input_streams[i];
167 if (ist->st->codec->codec_type == type && ist->discard)
168 break;
169 }
170 if (i == nb_input_streams) {
171 av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
172 "unlabeled input pad %d on filter %s", in->pad_idx,
173 in->filter_ctx->name);
174 exit_program(1);
175 }
176 }
177 av_assert0(ist);
178
179 ist->discard = 0;
180 ist->decoding_needed = 1;
181 ist->st->discard = AVDISCARD_NONE;
182
183 fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
184 &fg->nb_inputs, fg->nb_inputs + 1);
185 if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
186 exit_program(1);
187 fg->inputs[fg->nb_inputs - 1]->ist = ist;
188 fg->inputs[fg->nb_inputs - 1]->graph = fg;
189
190 ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
191 &ist->nb_filters, ist->nb_filters + 1);
192 ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
193}
194
195static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
196{
197 char *pix_fmts;
198 OutputStream *ost = ofilter->ost;
199 AVCodecContext *codec = ost->st->codec;
200 AVFilterContext *last_filter = out->filter_ctx;
201 int pad_idx = out->pad_idx;
202 int ret;
203 char name[255];
204
205 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
206 ret = avfilter_graph_create_filter(&ofilter->filter,
207 avfilter_get_by_name("buffersink"),
208 name, NULL, pix_fmts, fg->graph);
209 if (ret < 0)
210 return ret;
211
212 if (codec->width || codec->height) {
213 char args[255];
214 AVFilterContext *filter;
215
216 snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
217 codec->width,
218 codec->height,
219 (unsigned)ost->sws_flags);
220 snprintf(name, sizeof(name), "scaler for output stream %d:%d",
221 ost->file_index, ost->index);
222 if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
223 name, args, NULL, fg->graph)) < 0)
224 return ret;
225 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
226 return ret;
227
228 last_filter = filter;
229 pad_idx = 0;
230 }
231
232 if ((pix_fmts = choose_pix_fmts(ost))) {
233 AVFilterContext *filter;
234 snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
235 ost->file_index, ost->index);
236 if ((ret = avfilter_graph_create_filter(&filter,
237 avfilter_get_by_name("format"),
238 "format", pix_fmts, NULL,
239 fg->graph)) < 0)
240 return ret;
241 if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
242 return ret;
243
244 last_filter = filter;
245 pad_idx = 0;
246 av_freep(&pix_fmts);
247 }
248
249 if (ost->frame_rate.num) {
250 AVFilterContext *fps;
251 char args[255];
252
253 snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
254 ost->frame_rate.den);
255 snprintf(name, sizeof(name), "fps for output stream %d:%d",
256 ost->file_index, ost->index);
257 ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
258 name, args, NULL, fg->graph);
259 if (ret < 0)
260 return ret;
261
262 ret = avfilter_link(last_filter, pad_idx, fps, 0);
263 if (ret < 0)
264 return ret;
265 last_filter = fps;
266 pad_idx = 0;
267 }
268
269 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
270 return ret;
271
272 return 0;
273}
274
275static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
276{
277 OutputStream *ost = ofilter->ost;
278 AVCodecContext *codec = ost->st->codec;
279 AVFilterContext *last_filter = out->filter_ctx;
280 int pad_idx = out->pad_idx;
281 char *sample_fmts, *sample_rates, *channel_layouts;
282 char name[255];
283 int ret;
284
285
286 snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
287 ret = avfilter_graph_create_filter(&ofilter->filter,
288 avfilter_get_by_name("abuffersink"),
289 name, NULL, NULL, fg->graph);
290 if (ret < 0)
291 return ret;
292
293 if (codec->channels && !codec->channel_layout)
294 codec->channel_layout = av_get_default_channel_layout(codec->channels);
295
296 sample_fmts = choose_sample_fmts(ost);
297 sample_rates = choose_sample_rates(ost);
298 channel_layouts = choose_channel_layouts(ost);
299 if (sample_fmts || sample_rates || channel_layouts) {
300 AVFilterContext *format;
301 char args[256];
302 int len = 0;
303
304 if (sample_fmts)
305 len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
306 sample_fmts);
307 if (sample_rates)
308 len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
309 sample_rates);
310 if (channel_layouts)
311 len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
312 channel_layouts);
313 args[len - 1] = 0;
314
315 av_freep(&sample_fmts);
316 av_freep(&sample_rates);
317 av_freep(&channel_layouts);
318
319 snprintf(name, sizeof(name), "audio format for output stream %d:%d",
320 ost->file_index, ost->index);
321 ret = avfilter_graph_create_filter(&format,
322 avfilter_get_by_name("aformat"),
323 name, args, NULL, fg->graph);
324 if (ret < 0)
325 return ret;
326
327 ret = avfilter_link(last_filter, pad_idx, format, 0);
328 if (ret < 0)
329 return ret;
330
331 last_filter = format;
332 pad_idx = 0;
333 }
334
335 if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
336 return ret;
337
338 return 0;
339}
340
341#define DESCRIBE_FILTER_LINK(f, inout, in) \
342{ \
343 AVFilterContext *ctx = inout->filter_ctx; \
344 AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
345 int nb_pads = in ? ctx->input_count : ctx->output_count; \
346 AVIOContext *pb; \
347 \
348 if (avio_open_dyn_buf(&pb) < 0) \
349 exit_program(1); \
350 \
351 avio_printf(pb, "%s", ctx->filter->name); \
352 if (nb_pads > 1) \
353 avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
354 avio_w8(pb, 0); \
355 avio_close_dyn_buf(pb, &f->name); \
356}
357
358int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
359{
360 av_freep(&ofilter->name);
361 DESCRIBE_FILTER_LINK(ofilter, out, 0);
362
363 switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
364 case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
365 case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
366 default: av_assert0(0);
367 }
368}
369
370static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
371 AVFilterInOut *in)
372{
373 AVFilterContext *first_filter = in->filter_ctx;
374 AVFilter *filter = avfilter_get_by_name("buffer");
375 InputStream *ist = ifilter->ist;
376 AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
377 ist->st->time_base;
378 AVRational sar;
379 char args[255], name[255];
380 int pad_idx = in->pad_idx;
381 int ret;
382
383 sar = ist->st->sample_aspect_ratio.num ?
384 ist->st->sample_aspect_ratio :
385 ist->st->codec->sample_aspect_ratio;
386 snprintf(args, sizeof(args), "%d:%d:%d:%d:%d:%d:%d", ist->st->codec->width,
387 ist->st->codec->height, ist->st->codec->pix_fmt,
388 tb.num, tb.den, sar.num, sar.den);
389 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
390 ist->file_index, ist->st->index);
391
392 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
393 args, NULL, fg->graph)) < 0)
394 return ret;
395
396 if (ist->framerate.num) {
397 AVFilterContext *setpts;
398
399 snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
400 ist->file_index, ist->st->index);
401 if ((ret = avfilter_graph_create_filter(&setpts,
402 avfilter_get_by_name("setpts"),
403 name, "N", NULL,
404 fg->graph)) < 0)
405 return ret;
406
407 if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
408 return ret;
409
410 first_filter = setpts;
411 pad_idx = 0;
412 }
413
414 if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
415 return ret;
416 return 0;
417}
418
419static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
420 AVFilterInOut *in)
421{
422 AVFilterContext *first_filter = in->filter_ctx;
423 AVFilter *filter = avfilter_get_by_name("abuffer");
424 InputStream *ist = ifilter->ist;
425 int pad_idx = in->pad_idx;
426 char args[255], name[255];
427 int ret;
428
429 snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
430 ":channel_layout=0x%"PRIx64,
431 1, ist->st->codec->sample_rate,
432 ist->st->codec->sample_rate,
433 av_get_sample_fmt_name(ist->st->codec->sample_fmt),
434 ist->st->codec->channel_layout);
435 snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
436 ist->file_index, ist->st->index);
437
438 if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
439 name, args, NULL,
440 fg->graph)) < 0)
441 return ret;
442
443 if (audio_sync_method > 0) {
444 AVFilterContext *async;
445 char args[256];
446 int len = 0;
447
448 av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
449 "asyncts audio filter instead.\n");
450
451 if (audio_sync_method > 1)
452 len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
453 "max_comp=%d:", audio_sync_method);
454 snprintf(args + len, sizeof(args) - len, "min_delta=%f",
455 audio_drift_threshold);
456
457 snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
458 fg->index, ist->file_index, ist->st->index);
459 ret = avfilter_graph_create_filter(&async,
460 avfilter_get_by_name("asyncts"),
461 name, args, NULL, fg->graph);
462 if (ret < 0)
463 return ret;
464
465 ret = avfilter_link(async, 0, first_filter, pad_idx);
466 if (ret < 0)
467 return ret;
468
469 first_filter = async;
470 pad_idx = 0;
471 }
472 if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
473 return ret;
474
475 return 0;
476}
477
478static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
479 AVFilterInOut *in)
480{
481 av_freep(&ifilter->name);
482 DESCRIBE_FILTER_LINK(ifilter, in, 1);
483
484 switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
485 case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
486 case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
487 default: av_assert0(0);
488 }
489}
490
491int configure_filtergraph(FilterGraph *fg)
492{
493 AVFilterInOut *inputs, *outputs, *cur;
494 int ret, i, init = !fg->graph, simple = !fg->graph_desc;
495 const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
496 fg->graph_desc;
497
498 avfilter_graph_free(&fg->graph);
499 if (!(fg->graph = avfilter_graph_alloc()))
500 return AVERROR(ENOMEM);
501
502 if (simple) {
503 OutputStream *ost = fg->outputs[0]->ost;
504 char args[255];
505 snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
506 fg->graph->scale_sws_opts = av_strdup(args);
507 }
508
509 if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
510 return ret;
511
512 if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
513 av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
514 "exactly one input and output.\n", graph_desc);
515 return AVERROR(EINVAL);
516 }
517
518 for (cur = inputs; !simple && init && cur; cur = cur->next)
519 init_input_filter(fg, cur);
520
521 for (cur = inputs, i = 0; cur; cur = cur->next, i++)
522 if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
523 return ret;
524 avfilter_inout_free(&inputs);
525
526 if (!init || simple) {
527 /* we already know the mappings between lavfi outputs and output streams,
528 * so we can finish the setup */
529 for (cur = outputs, i = 0; cur; cur = cur->next, i++)
530 configure_output_filter(fg, fg->outputs[i], cur);
531 avfilter_inout_free(&outputs);
532
533 if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
534 return ret;
535 } else {
536 /* wait until output mappings are processed */
537 for (cur = outputs; cur;) {
538 fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
539 &fg->nb_outputs, fg->nb_outputs + 1);
540 if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
541 exit_program(1);
542 fg->outputs[fg->nb_outputs - 1]->graph = fg;
543 fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
544 cur = cur->next;
545 fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
546 }
547 }
548
549 return 0;
550}
551
552int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
553{
554 int i;
555 for (i = 0; i < fg->nb_inputs; i++)
556 if (fg->inputs[i]->ist == ist)
557 return 1;
558 return 0;
559}
560