Merge commit '38f0c0781a6e099f11c0acec07f9b8be742190c4'
[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 "ffmpeg.h"
22
23 #include "libavfilter/avfilter.h"
24 #include "libavfilter/buffersink.h"
25
26 #include "libavresample/avresample.h"
27
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/bprint.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/pixfmt.h"
35 #include "libavutil/imgutils.h"
36 #include "libavutil/samplefmt.h"
37
38 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
39 {
40     if (codec && codec->pix_fmts) {
41         const enum AVPixelFormat *p = codec->pix_fmts;
42         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
43         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
44         enum AVPixelFormat best= AV_PIX_FMT_NONE;
45         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
46             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
47                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
48             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
49                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
50                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
51             }
52         }
53         for (; *p != AV_PIX_FMT_NONE; p++) {
54             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
55             if (*p == target)
56                 break;
57         }
58         if (*p == AV_PIX_FMT_NONE) {
59             if (target != AV_PIX_FMT_NONE)
60                 av_log(NULL, AV_LOG_WARNING,
61                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
62                        av_get_pix_fmt_name(target),
63                        codec->name,
64                        av_get_pix_fmt_name(best));
65             return best;
66         }
67     }
68     return target;
69 }
70
71 void choose_sample_fmt(AVStream *st, AVCodec *codec)
72 {
73     if (codec && codec->sample_fmts) {
74         const enum AVSampleFormat *p = codec->sample_fmts;
75         for (; *p != -1; p++) {
76             if (*p == st->codec->sample_fmt)
77                 break;
78         }
79         if (*p == -1) {
80             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
81                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
82             if(av_get_sample_fmt_name(st->codec->sample_fmt))
83             av_log(NULL, AV_LOG_WARNING,
84                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
85                    av_get_sample_fmt_name(st->codec->sample_fmt),
86                    codec->name,
87                    av_get_sample_fmt_name(codec->sample_fmts[0]));
88             st->codec->sample_fmt = codec->sample_fmts[0];
89         }
90     }
91 }
92
93 static char *choose_pix_fmts(OutputStream *ost)
94 {
95      if (ost->keep_pix_fmt) {
96         if (ost->filter)
97             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
98                                             AVFILTER_AUTO_CONVERT_NONE);
99         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
100             return NULL;
101         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
102     }
103     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
104         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
105     } else if (ost->enc && ost->enc->pix_fmts) {
106         const enum AVPixelFormat *p;
107         AVIOContext *s = NULL;
108         uint8_t *ret;
109         int len;
110
111         if (avio_open_dyn_buf(&s) < 0)
112             exit(1);
113
114         p = ost->enc->pix_fmts;
115         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
116             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
117                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
118             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
119                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
120                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
121             }
122         }
123
124         for (; *p != AV_PIX_FMT_NONE; p++) {
125             const char *name = av_get_pix_fmt_name(*p);
126             avio_printf(s, "%s|", name);
127         }
128         len = avio_close_dyn_buf(s, &ret);
129         ret[len - 1] = 0;
130         return ret;
131     } else
132         return NULL;
133 }
134
135 /* Define a function for building a string containing a list of
136  * allowed formats. */
137 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
138 static char *choose_ ## var ## s(OutputStream *ost)                            \
139 {                                                                              \
140     if (ost->st->codec->var != none) {                                         \
141         get_name(ost->st->codec->var);                                         \
142         return av_strdup(name);                                                \
143     } else if (ost->enc && ost->enc->supported_list) {                         \
144         const type *p;                                                         \
145         AVIOContext *s = NULL;                                                 \
146         uint8_t *ret;                                                          \
147         int len;                                                               \
148                                                                                \
149         if (avio_open_dyn_buf(&s) < 0)                                         \
150             exit(1);                                                           \
151                                                                                \
152         for (p = ost->enc->supported_list; *p != none; p++) {                  \
153             get_name(*p);                                                      \
154             avio_printf(s, "%s" separator, name);                              \
155         }                                                                      \
156         len = avio_close_dyn_buf(s, &ret);                                     \
157         ret[len - 1] = 0;                                                      \
158         return ret;                                                            \
159     } else                                                                     \
160         return NULL;                                                           \
161 }
162
163 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
164 //                   GET_PIX_FMT_NAME, ":")
165
166 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
167                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, "|")
168
169 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
170                   GET_SAMPLE_RATE_NAME, "|")
171
172 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
173                   GET_CH_LAYOUT_NAME, "|")
174
175 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
176 {
177     FilterGraph *fg = av_mallocz(sizeof(*fg));
178
179     if (!fg)
180         exit(1);
181     fg->index = nb_filtergraphs;
182
183     GROW_ARRAY(fg->outputs, fg->nb_outputs);
184     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
185         exit(1);
186     fg->outputs[0]->ost   = ost;
187     fg->outputs[0]->graph = fg;
188
189     ost->filter = fg->outputs[0];
190
191     GROW_ARRAY(fg->inputs, fg->nb_inputs);
192     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
193         exit(1);
194     fg->inputs[0]->ist   = ist;
195     fg->inputs[0]->graph = fg;
196
197     GROW_ARRAY(ist->filters, ist->nb_filters);
198     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
199
200     GROW_ARRAY(filtergraphs, nb_filtergraphs);
201     filtergraphs[nb_filtergraphs - 1] = fg;
202
203     return fg;
204 }
205
206 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
207 {
208     InputStream *ist = NULL;
209     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
210     int i;
211
212     // TODO: support other filter types
213     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
214         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
215                "currently.\n");
216         exit(1);
217     }
218
219     if (in->name) {
220         AVFormatContext *s;
221         AVStream       *st = NULL;
222         char *p;
223         int file_idx = strtol(in->name, &p, 0);
224
225         if (file_idx < 0 || file_idx >= nb_input_files) {
226             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
227                    file_idx, fg->graph_desc);
228             exit(1);
229         }
230         s = input_files[file_idx]->ctx;
231
232         for (i = 0; i < s->nb_streams; i++) {
233             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
234             if (stream_type != type &&
235                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
236                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
237                 continue;
238             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
239                 st = s->streams[i];
240                 break;
241             }
242         }
243         if (!st) {
244             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
245                    "matches no streams.\n", p, fg->graph_desc);
246             exit(1);
247         }
248         ist = input_streams[input_files[file_idx]->ist_index + st->index];
249     } else {
250         /* find the first unused stream of corresponding type */
251         for (i = 0; i < nb_input_streams; i++) {
252             ist = input_streams[i];
253             if (ist->st->codec->codec_type == type && ist->discard)
254                 break;
255         }
256         if (i == nb_input_streams) {
257             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
258                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
259                    in->filter_ctx->name);
260             exit(1);
261         }
262     }
263     av_assert0(ist);
264
265     ist->discard         = 0;
266     ist->decoding_needed++;
267     ist->st->discard = AVDISCARD_NONE;
268
269     GROW_ARRAY(fg->inputs, fg->nb_inputs);
270     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
271         exit(1);
272     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
273     fg->inputs[fg->nb_inputs - 1]->graph = fg;
274
275     GROW_ARRAY(ist->filters, ist->nb_filters);
276     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
277 }
278
279 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
280 {
281     char *pix_fmts;
282     OutputStream *ost = ofilter->ost;
283     AVCodecContext *codec = ost->st->codec;
284     AVFilterContext *last_filter = out->filter_ctx;
285     int pad_idx = out->pad_idx;
286     int ret;
287     char name[255];
288     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
289
290     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
291     ret = avfilter_graph_create_filter(&ofilter->filter,
292                                        avfilter_get_by_name("buffersink"),
293                                        name, NULL, NULL, fg->graph);
294     av_freep(&buffersink_params);
295
296     if (ret < 0)
297         return ret;
298
299     if (codec->width || codec->height) {
300         char args[255];
301         AVFilterContext *filter;
302
303         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
304                  codec->width,
305                  codec->height,
306                  (unsigned)ost->sws_flags);
307         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
308                  ost->file_index, ost->index);
309         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
310                                                 name, args, NULL, fg->graph)) < 0)
311             return ret;
312         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
313             return ret;
314
315         last_filter = filter;
316         pad_idx = 0;
317     }
318
319     if ((pix_fmts = choose_pix_fmts(ost))) {
320         AVFilterContext *filter;
321         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
322                  ost->file_index, ost->index);
323         if ((ret = avfilter_graph_create_filter(&filter,
324                                                 avfilter_get_by_name("format"),
325                                                 "format", pix_fmts, NULL,
326                                                 fg->graph)) < 0)
327             return ret;
328         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
329             return ret;
330
331         last_filter = filter;
332         pad_idx     = 0;
333         av_freep(&pix_fmts);
334     }
335
336     if (ost->frame_rate.num && 0) {
337         AVFilterContext *fps;
338         char args[255];
339
340         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
341                  ost->frame_rate.den);
342         snprintf(name, sizeof(name), "fps for output stream %d:%d",
343                  ost->file_index, ost->index);
344         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
345                                            name, args, NULL, fg->graph);
346         if (ret < 0)
347             return ret;
348
349         ret = avfilter_link(last_filter, pad_idx, fps, 0);
350         if (ret < 0)
351             return ret;
352         last_filter = fps;
353         pad_idx = 0;
354     }
355
356     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
357         return ret;
358
359     return 0;
360 }
361
362 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
363 {
364     OutputStream *ost = ofilter->ost;
365     AVCodecContext *codec  = ost->st->codec;
366     AVFilterContext *last_filter = out->filter_ctx;
367     int pad_idx = out->pad_idx;
368     char *sample_fmts, *sample_rates, *channel_layouts;
369     char name[255];
370     int ret;
371     AVABufferSinkParams *params = av_abuffersink_params_alloc();
372
373     if (!params)
374         return AVERROR(ENOMEM);
375     params->all_channel_counts = 1;
376     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
377     ret = avfilter_graph_create_filter(&ofilter->filter,
378                                        avfilter_get_by_name("abuffersink"),
379                                        name, NULL, params, fg->graph);
380     av_freep(&params);
381     if (ret < 0)
382         return ret;
383
384 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
385     AVFilterContext *filt_ctx;                                              \
386                                                                             \
387     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
388            "similarly to -af " filter_name "=%s.\n", arg);                  \
389                                                                             \
390     ret = avfilter_graph_create_filter(&filt_ctx,                           \
391                                        avfilter_get_by_name(filter_name),   \
392                                        filter_name, arg, NULL, fg->graph);  \
393     if (ret < 0)                                                            \
394         return ret;                                                         \
395                                                                             \
396     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
397     if (ret < 0)                                                            \
398         return ret;                                                         \
399                                                                             \
400     last_filter = filt_ctx;                                                 \
401     pad_idx = 0;                                                            \
402 } while (0)
403     if (ost->audio_channels_mapped) {
404         int i;
405         AVBPrint pan_buf;
406         av_bprint_init(&pan_buf, 256, 8192);
407         av_bprintf(&pan_buf, "0x%"PRIx64,
408                    av_get_default_channel_layout(ost->audio_channels_mapped));
409         for (i = 0; i < ost->audio_channels_mapped; i++)
410             if (ost->audio_channels_map[i] != -1)
411                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
412
413         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
414         av_bprint_finalize(&pan_buf, NULL);
415     }
416
417     if (codec->channels && !codec->channel_layout)
418         codec->channel_layout = av_get_default_channel_layout(codec->channels);
419
420     sample_fmts     = choose_sample_fmts(ost);
421     sample_rates    = choose_sample_rates(ost);
422     channel_layouts = choose_channel_layouts(ost);
423     if (sample_fmts || sample_rates || channel_layouts) {
424         AVFilterContext *format;
425         char args[256];
426         args[0] = 0;
427
428         if (sample_fmts)
429             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
430                             sample_fmts);
431         if (sample_rates)
432             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
433                             sample_rates);
434         if (channel_layouts)
435             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
436                             channel_layouts);
437
438         av_freep(&sample_fmts);
439         av_freep(&sample_rates);
440         av_freep(&channel_layouts);
441
442         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
443                  ost->file_index, ost->index);
444         ret = avfilter_graph_create_filter(&format,
445                                            avfilter_get_by_name("aformat"),
446                                            name, args, NULL, fg->graph);
447         if (ret < 0)
448             return ret;
449
450         ret = avfilter_link(last_filter, pad_idx, format, 0);
451         if (ret < 0)
452             return ret;
453
454         last_filter = format;
455         pad_idx = 0;
456     }
457
458     if (audio_volume != 256 && 0) {
459         char args[256];
460
461         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
462         AUTO_INSERT_FILTER("-vol", "volume", args);
463     }
464
465     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
466         return ret;
467
468     return 0;
469 }
470
471 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
472 {                                                                  \
473     AVFilterContext *ctx = inout->filter_ctx;                      \
474     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
475     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
476     AVIOContext *pb;                                               \
477                                                                    \
478     if (avio_open_dyn_buf(&pb) < 0)                                \
479         exit(1);                                                   \
480                                                                    \
481     avio_printf(pb, "%s", ctx->filter->name);                      \
482     if (nb_pads > 1)                                               \
483         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
484     avio_w8(pb, 0);                                                \
485     avio_close_dyn_buf(pb, &f->name);                              \
486 }
487
488 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
489 {
490     av_freep(&ofilter->name);
491     DESCRIBE_FILTER_LINK(ofilter, out, 0);
492
493     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
494     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
495     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
496     default: av_assert0(0);
497     }
498 }
499
500 static int sub2video_prepare(InputStream *ist)
501 {
502     AVFormatContext *avf = input_files[ist->file_index]->ctx;
503     int i, w, h;
504
505     /* Compute the size of the canvas for the subtitles stream.
506        If the subtitles codec has set a size, use it. Otherwise use the
507        maximum dimensions of the video streams in the same file. */
508     w = ist->st->codec->width;
509     h = ist->st->codec->height;
510     if (!(w && h)) {
511         for (i = 0; i < avf->nb_streams; i++) {
512             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
513                 w = FFMAX(w, avf->streams[i]->codec->width);
514                 h = FFMAX(h, avf->streams[i]->codec->height);
515             }
516         }
517         if (!(w && h)) {
518             w = FFMAX(w, 720);
519             h = FFMAX(h, 576);
520         }
521         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
522     }
523     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
524     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
525
526     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
527        palettes for all rectangles are identical or compatible */
528     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
529
530     ist->sub2video.frame = av_frame_alloc();
531     if (!ist->sub2video.frame)
532         return AVERROR(ENOMEM);
533     return 0;
534 }
535
536 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
537                                         AVFilterInOut *in)
538 {
539     AVFilterContext *first_filter = in->filter_ctx;
540     AVFilter *filter = avfilter_get_by_name("buffer");
541     InputStream *ist = ifilter->ist;
542     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
543                                          ist->st->time_base;
544     AVRational fr = ist->framerate;
545     AVRational sar;
546     AVBPrint args;
547     char name[255];
548     int pad_idx = in->pad_idx;
549     int ret;
550
551     if (!fr.num)
552         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
553
554     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
555         ret = sub2video_prepare(ist);
556         if (ret < 0)
557             return ret;
558     }
559
560     sar = ist->st->sample_aspect_ratio.num ?
561           ist->st->sample_aspect_ratio :
562           ist->st->codec->sample_aspect_ratio;
563     if(!sar.den)
564         sar = (AVRational){0,1};
565     av_bprint_init(&args, 0, 1);
566     av_bprintf(&args,
567              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
568              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
569              ist->resample_height, ist->resample_pix_fmt,
570              tb.num, tb.den, sar.num, sar.den,
571              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
572     if (fr.num && fr.den)
573         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
574     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
575              ist->file_index, ist->st->index);
576
577     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
578                                             args.str, NULL, fg->graph)) < 0)
579         return ret;
580
581     if (ist->framerate.num) {
582         AVFilterContext *setpts;
583
584         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
585                  ist->file_index, ist->st->index);
586         if ((ret = avfilter_graph_create_filter(&setpts,
587                                                 avfilter_get_by_name("setpts"),
588                                                 name, "N", NULL,
589                                                 fg->graph)) < 0)
590             return ret;
591
592         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
593             return ret;
594
595         first_filter = setpts;
596         pad_idx = 0;
597     }
598
599     if (do_deinterlace) {
600         AVFilterContext *yadif;
601
602         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
603                  ist->file_index, ist->st->index);
604         if ((ret = avfilter_graph_create_filter(&yadif,
605                                                 avfilter_get_by_name("yadif"),
606                                                 name, "", NULL,
607                                                 fg->graph)) < 0)
608             return ret;
609
610         if ((ret = avfilter_link(yadif, 0, first_filter, pad_idx)) < 0)
611             return ret;
612
613         first_filter = yadif;
614         pad_idx = 0;
615     }
616
617     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
618         return ret;
619     return 0;
620 }
621
622 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
623                                         AVFilterInOut *in)
624 {
625     AVFilterContext *first_filter = in->filter_ctx;
626     AVFilter *filter = avfilter_get_by_name("abuffer");
627     InputStream *ist = ifilter->ist;
628     int pad_idx = in->pad_idx;
629     AVBPrint args;
630     char name[255];
631     int ret;
632
633     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
634     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
635              1, ist->st->codec->sample_rate,
636              ist->st->codec->sample_rate,
637              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
638     if (ist->st->codec->channel_layout)
639         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
640                    ist->st->codec->channel_layout);
641     else
642         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
643     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
644              ist->file_index, ist->st->index);
645
646     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
647                                             name, args.str, NULL,
648                                             fg->graph)) < 0)
649         return ret;
650
651 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
652     AVFilterContext *filt_ctx;                                              \
653                                                                             \
654     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
655            "similarly to -af " filter_name "=%s.\n", arg);                  \
656                                                                             \
657     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
658                 fg->index, filter_name, ist->file_index, ist->st->index);   \
659     ret = avfilter_graph_create_filter(&filt_ctx,                           \
660                                        avfilter_get_by_name(filter_name),   \
661                                        name, arg, NULL, fg->graph);         \
662     if (ret < 0)                                                            \
663         return ret;                                                         \
664                                                                             \
665     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
666     if (ret < 0)                                                            \
667         return ret;                                                         \
668                                                                             \
669     first_filter = filt_ctx;                                                  \
670 } while (0)
671
672     if (audio_sync_method > 0) {
673         char args[256] = {0};
674
675         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
676         if (audio_drift_threshold != 0.1)
677             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
678         if (!fg->reconfiguration)
679             av_strlcatf(args, sizeof(args), ":first_pts=0");
680         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
681     }
682
683 //     if (ost->audio_channels_mapped) {
684 //         int i;
685 //         AVBPrint pan_buf;
686 //         av_bprint_init(&pan_buf, 256, 8192);
687 //         av_bprintf(&pan_buf, "0x%"PRIx64,
688 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
689 //         for (i = 0; i < ost->audio_channels_mapped; i++)
690 //             if (ost->audio_channels_map[i] != -1)
691 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
692 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
693 //         av_bprint_finalize(&pan_buf, NULL);
694 //     }
695
696     if (audio_volume != 256) {
697         char args[256];
698
699         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
700                "audio filter instead.\n");
701
702         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
703         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
704     }
705     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
706         return ret;
707
708     return 0;
709 }
710
711 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
712                                   AVFilterInOut *in)
713 {
714     av_freep(&ifilter->name);
715     DESCRIBE_FILTER_LINK(ifilter, in, 1);
716
717     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
718     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
719     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
720     default: av_assert0(0);
721     }
722 }
723
724 int configure_filtergraph(FilterGraph *fg)
725 {
726     AVFilterInOut *inputs, *outputs, *cur;
727     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
728     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
729                                       fg->graph_desc;
730
731     avfilter_graph_free(&fg->graph);
732     if (!(fg->graph = avfilter_graph_alloc()))
733         return AVERROR(ENOMEM);
734
735     if (simple) {
736         OutputStream *ost = fg->outputs[0]->ost;
737         char args[512];
738         AVDictionaryEntry *e = NULL;
739
740         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
741         fg->graph->scale_sws_opts = av_strdup(args);
742
743         args[0] = 0;
744         while ((e = av_dict_get(ost->swr_opts, "", e,
745                                 AV_DICT_IGNORE_SUFFIX))) {
746             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
747         }
748         if (strlen(args))
749             args[strlen(args)-1] = 0;
750         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
751
752         args[0] = '\0';
753         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
754                                 AV_DICT_IGNORE_SUFFIX))) {
755             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
756         }
757         if (strlen(args))
758             args[strlen(args) - 1] = '\0';
759         fg->graph->resample_lavr_opts = av_strdup(args);
760     }
761
762     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
763         return ret;
764
765     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
766         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
767                "exactly one input and output.\n", graph_desc);
768         return AVERROR(EINVAL);
769     }
770
771     for (cur = inputs; !simple && init && cur; cur = cur->next)
772         init_input_filter(fg, cur);
773
774     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
775         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
776             return ret;
777     avfilter_inout_free(&inputs);
778
779     if (!init || simple) {
780         /* we already know the mappings between lavfi outputs and output streams,
781          * so we can finish the setup */
782         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
783             configure_output_filter(fg, fg->outputs[i], cur);
784         avfilter_inout_free(&outputs);
785
786         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
787             return ret;
788     } else {
789         /* wait until output mappings are processed */
790         for (cur = outputs; cur;) {
791             GROW_ARRAY(fg->outputs, fg->nb_outputs);
792             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
793                 exit(1);
794             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
795             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
796             cur = cur->next;
797             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
798         }
799     }
800
801     fg->reconfiguration = 1;
802     return 0;
803 }
804
805 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
806 {
807     int i;
808     for (i = 0; i < fg->nb_inputs; i++)
809         if (fg->inputs[i]->ist == ist)
810             return 1;
811     return 0;
812 }
813