lavf/avformat_seek_file: fix harmless integer overflow
[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/avfiltergraph.h"
25 #include "libavfilter/buffersink.h"
26
27 #include "libavutil/audioconvert.h"
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/bprint.h"
31 #include "libavutil/pixdesc.h"
32 #include "libavutil/pixfmt.h"
33 #include "libavutil/imgutils.h"
34 #include "libavutil/samplefmt.h"
35
36 enum PixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum PixelFormat target)
37 {
38     if (codec && codec->pix_fmts) {
39         const enum PixelFormat *p = codec->pix_fmts;
40         int has_alpha= av_pix_fmt_descriptors[target].nb_components % 2 == 0;
41         enum PixelFormat best= PIX_FMT_NONE;
42         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
43             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
44                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE };
45             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
46                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUV420P,
47                                                  PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_BGRA, PIX_FMT_NONE };
48             }
49         }
50         for (; *p != PIX_FMT_NONE; p++) {
51             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
52             if (*p == target)
53                 break;
54         }
55         if (*p == PIX_FMT_NONE) {
56             if (target != PIX_FMT_NONE)
57                 av_log(NULL, AV_LOG_WARNING,
58                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
59                        av_pix_fmt_descriptors[target].name,
60                        codec->name,
61                        av_pix_fmt_descriptors[best].name);
62             return best;
63         }
64     }
65     return target;
66 }
67
68 void choose_sample_fmt(AVStream *st, AVCodec *codec)
69 {
70     if (codec && codec->sample_fmts) {
71         const enum AVSampleFormat *p = codec->sample_fmts;
72         for (; *p != -1; p++) {
73             if (*p == st->codec->sample_fmt)
74                 break;
75         }
76         if (*p == -1) {
77             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
78                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
79             if(av_get_sample_fmt_name(st->codec->sample_fmt))
80             av_log(NULL, AV_LOG_WARNING,
81                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
82                    av_get_sample_fmt_name(st->codec->sample_fmt),
83                    codec->name,
84                    av_get_sample_fmt_name(codec->sample_fmts[0]));
85             st->codec->sample_fmt = codec->sample_fmts[0];
86         }
87     }
88 }
89
90 static char *choose_pix_fmts(OutputStream *ost)
91 {
92      if (ost->keep_pix_fmt) {
93         if (ost->filter)
94             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
95                                             AVFILTER_AUTO_CONVERT_NONE);
96         if (ost->st->codec->pix_fmt == PIX_FMT_NONE)
97             return NULL;
98         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
99     }
100     if (ost->st->codec->pix_fmt != PIX_FMT_NONE) {
101         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
102     } else if (ost->enc && ost->enc->pix_fmts) {
103         const enum PixelFormat *p;
104         AVIOContext *s = NULL;
105         uint8_t *ret;
106         int len;
107
108         if (avio_open_dyn_buf(&s) < 0)
109             exit_program(1);
110
111         p = ost->enc->pix_fmts;
112         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
113             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
114                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE };
115             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
116                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUV420P,
117                                                     PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_BGRA, PIX_FMT_NONE };
118             }
119         }
120
121         for (; *p != PIX_FMT_NONE; p++) {
122             const char *name = av_get_pix_fmt_name(*p);
123             avio_printf(s, "%s:", name);
124         }
125         len = avio_close_dyn_buf(s, &ret);
126         ret[len - 1] = 0;
127         return ret;
128     } else
129         return NULL;
130 }
131
132 /**
133  * Define a function for building a string containing a list of
134  * allowed formats,
135  */
136 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
137 static char *choose_ ## var ## s(OutputStream *ost)                            \
138 {                                                                              \
139     if (ost->st->codec->var != none) {                                         \
140         get_name(ost->st->codec->var);                                         \
141         return av_strdup(name);                                                \
142     } else if (ost->enc->supported_list) {                                     \
143         const type *p;                                                         \
144         AVIOContext *s = NULL;                                                 \
145         uint8_t *ret;                                                          \
146         int len;                                                               \
147                                                                                \
148         if (avio_open_dyn_buf(&s) < 0)                                         \
149             exit_program(1);                                                   \
150                                                                                \
151         for (p = ost->enc->supported_list; *p != none; p++) {                  \
152             get_name(*p);                                                      \
153             avio_printf(s, "%s" separator, name);                              \
154         }                                                                      \
155         len = avio_close_dyn_buf(s, &ret);                                     \
156         ret[len - 1] = 0;                                                      \
157         return ret;                                                            \
158     } else                                                                     \
159         return NULL;                                                           \
160 }
161
162 // DEF_CHOOSE_FORMAT(enum PixelFormat, pix_fmt, pix_fmts, PIX_FMT_NONE,
163 //                   GET_PIX_FMT_NAME, ":")
164
165 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
166                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
167
168 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
169                   GET_SAMPLE_RATE_NAME, ",")
170
171 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
172                   GET_CH_LAYOUT_NAME, ",")
173
174 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
175 {
176     FilterGraph *fg = av_mallocz(sizeof(*fg));
177
178     if (!fg)
179         exit_program(1);
180     fg->index = nb_filtergraphs;
181
182     fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
183                              fg->nb_outputs + 1);
184     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
185         exit_program(1);
186     fg->outputs[0]->ost   = ost;
187     fg->outputs[0]->graph = fg;
188
189     ost->filter = fg->outputs[0];
190
191     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
192                             fg->nb_inputs + 1);
193     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
194         exit_program(1);
195     fg->inputs[0]->ist   = ist;
196     fg->inputs[0]->graph = fg;
197
198     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
199                               &ist->nb_filters, ist->nb_filters + 1);
200     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
201
202     filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
203                               &nb_filtergraphs, nb_filtergraphs + 1);
204     filtergraphs[nb_filtergraphs - 1] = fg;
205
206     return fg;
207 }
208
209 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
210 {
211     InputStream *ist = NULL;
212     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
213     int i;
214
215     // TODO: support other filter types
216     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
217         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
218                "currently.\n");
219         exit_program(1);
220     }
221
222     if (in->name) {
223         AVFormatContext *s;
224         AVStream       *st = NULL;
225         char *p;
226         int file_idx = strtol(in->name, &p, 0);
227
228         if (file_idx < 0 || file_idx >= nb_input_files) {
229             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
230                    file_idx, fg->graph_desc);
231             exit_program(1);
232         }
233         s = input_files[file_idx]->ctx;
234
235         for (i = 0; i < s->nb_streams; i++) {
236             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
237             if (stream_type != type &&
238                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
239                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
240                 continue;
241             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
242                 st = s->streams[i];
243                 break;
244             }
245         }
246         if (!st) {
247             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
248                    "matches no streams.\n", p, fg->graph_desc);
249             exit_program(1);
250         }
251         ist = input_streams[input_files[file_idx]->ist_index + st->index];
252     } else {
253         /* find the first unused stream of corresponding type */
254         for (i = 0; i < nb_input_streams; i++) {
255             ist = input_streams[i];
256             if (ist->st->codec->codec_type == type && ist->discard)
257                 break;
258         }
259         if (i == nb_input_streams) {
260             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
261                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
262                    in->filter_ctx->name);
263             exit_program(1);
264         }
265     }
266     av_assert0(ist);
267
268     ist->discard         = 0;
269     ist->decoding_needed++;
270     ist->st->discard = AVDISCARD_NONE;
271
272     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
273                             &fg->nb_inputs, fg->nb_inputs + 1);
274     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
275         exit_program(1);
276     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
277     fg->inputs[fg->nb_inputs - 1]->graph = fg;
278
279     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
280                               &ist->nb_filters, ist->nb_filters + 1);
281     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
282 }
283
284 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
285 {
286     char *pix_fmts;
287     OutputStream *ost = ofilter->ost;
288     AVCodecContext *codec = ost->st->codec;
289     AVFilterContext *last_filter = out->filter_ctx;
290     int pad_idx = out->pad_idx;
291     int ret;
292     char name[255];
293     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
294
295     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
296     ret = avfilter_graph_create_filter(&ofilter->filter,
297                                        avfilter_get_by_name("ffbuffersink"),
298                                        name, NULL, NULL/*buffersink_params*/, fg->graph);
299     av_freep(&buffersink_params);
300
301     if (ret < 0)
302         return ret;
303
304     if (codec->width || codec->height) {
305         char args[255];
306         AVFilterContext *filter;
307
308         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
309                  codec->width,
310                  codec->height,
311                  (unsigned)ost->sws_flags);
312         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
313                  ost->file_index, ost->index);
314         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
315                                                 name, args, NULL, fg->graph)) < 0)
316             return ret;
317         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
318             return ret;
319
320         last_filter = filter;
321         pad_idx = 0;
322     }
323
324     if ((pix_fmts = choose_pix_fmts(ost))) {
325         AVFilterContext *filter;
326         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
327                  ost->file_index, ost->index);
328         if ((ret = avfilter_graph_create_filter(&filter,
329                                                 avfilter_get_by_name("format"),
330                                                 "format", pix_fmts, NULL,
331                                                 fg->graph)) < 0)
332             return ret;
333         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
334             return ret;
335
336         last_filter = filter;
337         pad_idx     = 0;
338         av_freep(&pix_fmts);
339     }
340
341     if (ost->frame_rate.num && 0) {
342         AVFilterContext *fps;
343         char args[255];
344
345         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
346                  ost->frame_rate.den);
347         snprintf(name, sizeof(name), "fps for output stream %d:%d",
348                  ost->file_index, ost->index);
349         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
350                                            name, args, NULL, fg->graph);
351         if (ret < 0)
352             return ret;
353
354         ret = avfilter_link(last_filter, pad_idx, fps, 0);
355         if (ret < 0)
356             return ret;
357         last_filter = fps;
358         pad_idx = 0;
359     }
360
361     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
362         return ret;
363
364     return 0;
365 }
366
367 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
368 {
369     OutputStream *ost = ofilter->ost;
370     AVCodecContext *codec  = ost->st->codec;
371     AVFilterContext *last_filter = out->filter_ctx;
372     int pad_idx = out->pad_idx;
373     char *sample_fmts, *sample_rates, *channel_layouts;
374     char name[255];
375     int ret;
376
377
378     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
379     ret = avfilter_graph_create_filter(&ofilter->filter,
380                                        avfilter_get_by_name("ffabuffersink"),
381                                        name, NULL, NULL, fg->graph);
382     if (ret < 0)
383         return ret;
384
385 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
386     AVFilterContext *filt_ctx;                                              \
387                                                                             \
388     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
389            "similarly to -af " filter_name "=%s.\n", arg);                  \
390                                                                             \
391     ret = avfilter_graph_create_filter(&filt_ctx,                           \
392                                        avfilter_get_by_name(filter_name),   \
393                                        filter_name, arg, NULL, fg->graph);  \
394     if (ret < 0)                                                            \
395         return ret;                                                         \
396                                                                             \
397     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
398     if (ret < 0)                                                            \
399         return ret;                                                         \
400                                                                             \
401     last_filter = filt_ctx;                                                 \
402     pad_idx = 0;                                                            \
403 } while (0)
404     if (ost->audio_channels_mapped) {
405         int i;
406         AVBPrint pan_buf;
407         av_bprint_init(&pan_buf, 256, 8192);
408         av_bprintf(&pan_buf, "0x%"PRIx64,
409                    av_get_default_channel_layout(ost->audio_channels_mapped));
410         for (i = 0; i < ost->audio_channels_mapped; i++)
411             if (ost->audio_channels_map[i] != -1)
412                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
413
414         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
415         av_bprint_finalize(&pan_buf, NULL);
416     }
417
418     if (codec->channels && !codec->channel_layout)
419         codec->channel_layout = av_get_default_channel_layout(codec->channels);
420
421     sample_fmts     = choose_sample_fmts(ost);
422     sample_rates    = choose_sample_rates(ost);
423     channel_layouts = choose_channel_layouts(ost);
424     if (sample_fmts || sample_rates || channel_layouts) {
425         AVFilterContext *format;
426         char args[256];
427         args[0] = 0;
428
429         if (sample_fmts)
430             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
431                             sample_fmts);
432         if (sample_rates)
433             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
434                             sample_rates);
435         if (channel_layouts)
436             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
437                             channel_layouts);
438
439         av_freep(&sample_fmts);
440         av_freep(&sample_rates);
441         av_freep(&channel_layouts);
442
443         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
444                  ost->file_index, ost->index);
445         ret = avfilter_graph_create_filter(&format,
446                                            avfilter_get_by_name("aformat"),
447                                            name, args, NULL, fg->graph);
448         if (ret < 0)
449             return ret;
450
451         ret = avfilter_link(last_filter, pad_idx, format, 0);
452         if (ret < 0)
453             return ret;
454
455         last_filter = format;
456         pad_idx = 0;
457     }
458
459     if (audio_volume != 256 && 0) {
460         char args[256];
461
462         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
463         AUTO_INSERT_FILTER("-vol", "volume", args);
464     }
465
466     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
467         return ret;
468
469     return 0;
470 }
471
472 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
473 {                                                                  \
474     AVFilterContext *ctx = inout->filter_ctx;                      \
475     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
476     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
477     AVIOContext *pb;                                               \
478                                                                    \
479     if (avio_open_dyn_buf(&pb) < 0)                                \
480         exit_program(1);                                           \
481                                                                    \
482     avio_printf(pb, "%s", ctx->filter->name);                      \
483     if (nb_pads > 1)                                               \
484         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
485     avio_w8(pb, 0);                                                \
486     avio_close_dyn_buf(pb, &f->name);                              \
487 }
488
489 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
490 {
491     av_freep(&ofilter->name);
492     DESCRIBE_FILTER_LINK(ofilter, out, 0);
493
494     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
495     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
496     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
497     default: av_assert0(0);
498     }
499 }
500
501 static int sub2video_prepare(InputStream *ist)
502 {
503     AVFormatContext *avf = input_files[ist->file_index]->ctx;
504     int i, ret, w, h;
505     uint8_t *image[4];
506     int linesize[4];
507
508     /* Compute the size of the canvas for the subtitles stream.
509        If the subtitles codec has set a size, use it. Otherwise use the
510        maximum dimensions of the video streams in the same file. */
511     w = ist->st->codec->width;
512     h = ist->st->codec->height;
513     if (!(w && h)) {
514         for (i = 0; i < avf->nb_streams; i++) {
515             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
516                 w = FFMAX(w, avf->streams[i]->codec->width);
517                 h = FFMAX(h, avf->streams[i]->codec->height);
518             }
519         }
520         if (!(w && h)) {
521             w = FFMAX(w, 720);
522             h = FFMAX(h, 576);
523         }
524         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
525     }
526     ist->sub2video.w = ist->st->codec->width  = w;
527     ist->sub2video.h = ist->st->codec->height = h;
528
529     /* rectangles are PIX_FMT_PAL8, but we have no guarantee that the
530        palettes for all rectangles are identical or compatible */
531     ist->st->codec->pix_fmt = PIX_FMT_RGB32;
532
533     ret = av_image_alloc(image, linesize, w, h, PIX_FMT_RGB32, 32);
534     if (ret < 0)
535         return ret;
536     memset(image[0], 0, h * linesize[0]);
537     ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
538             image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
539             w, h, PIX_FMT_RGB32);
540     if (!ist->sub2video.ref) {
541         av_free(image[0]);
542         return AVERROR(ENOMEM);
543     }
544     return 0;
545 }
546
547 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
548                                         AVFilterInOut *in)
549 {
550     AVFilterContext *first_filter = in->filter_ctx;
551     AVFilter *filter = avfilter_get_by_name("buffer");
552     InputStream *ist = ifilter->ist;
553     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
554                                          ist->st->time_base;
555     AVRational fr = ist->framerate.num ? ist->framerate :
556                                          ist->st->r_frame_rate;
557     AVRational sar;
558     AVBPrint args;
559     char name[255];
560     int pad_idx = in->pad_idx;
561     int ret;
562
563     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
564         ret = sub2video_prepare(ist);
565         if (ret < 0)
566             return ret;
567     }
568
569     sar = ist->st->sample_aspect_ratio.num ?
570           ist->st->sample_aspect_ratio :
571           ist->st->codec->sample_aspect_ratio;
572     if(!sar.den)
573         sar = (AVRational){0,1};
574     av_bprint_init(&args, 0, 1);
575     av_bprintf(&args,
576              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
577              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->st->codec->width,
578              ist->st->codec->height, ist->st->codec->pix_fmt,
579              tb.num, tb.den, sar.num, sar.den,
580              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
581     if (fr.num && fr.den)
582         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
583     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
584              ist->file_index, ist->st->index);
585
586     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
587                                             args.str, NULL, fg->graph)) < 0)
588         return ret;
589
590     if (ist->framerate.num) {
591         AVFilterContext *setpts;
592
593         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
594                  ist->file_index, ist->st->index);
595         if ((ret = avfilter_graph_create_filter(&setpts,
596                                                 avfilter_get_by_name("setpts"),
597                                                 name, "N", NULL,
598                                                 fg->graph)) < 0)
599             return ret;
600
601         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
602             return ret;
603
604         first_filter = setpts;
605         pad_idx = 0;
606     }
607
608     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
609         return ret;
610     return 0;
611 }
612
613 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
614                                         AVFilterInOut *in)
615 {
616     AVFilterContext *first_filter = in->filter_ctx;
617     AVFilter *filter = avfilter_get_by_name("abuffer");
618     InputStream *ist = ifilter->ist;
619     int pad_idx = in->pad_idx;
620     char args[255], name[255];
621     int ret;
622
623     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
624              ":channel_layout=0x%"PRIx64,
625              1, ist->st->codec->sample_rate,
626              ist->st->codec->sample_rate,
627              av_get_sample_fmt_name(ist->st->codec->sample_fmt),
628              ist->st->codec->channel_layout);
629     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
630              ist->file_index, ist->st->index);
631
632     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
633                                             name, args, NULL,
634                                             fg->graph)) < 0)
635         return ret;
636
637 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
638     AVFilterContext *filt_ctx;                                              \
639                                                                             \
640     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
641            "similarly to -af " filter_name "=%s.\n", arg);                  \
642                                                                             \
643     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
644                 fg->index, filter_name, ist->file_index, ist->st->index);   \
645     ret = avfilter_graph_create_filter(&filt_ctx,                           \
646                                        avfilter_get_by_name(filter_name),   \
647                                        name, arg, NULL, fg->graph);         \
648     if (ret < 0)                                                            \
649         return ret;                                                         \
650                                                                             \
651     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
652     if (ret < 0)                                                            \
653         return ret;                                                         \
654                                                                             \
655     first_filter = filt_ctx;                                                  \
656 } while (0)
657
658     if (audio_sync_method > 0) {
659         char args[256] = {0};
660
661         av_strlcatf(args, sizeof(args), "min_comp=0.001:min_hard_comp=%f", audio_drift_threshold);
662         if (audio_sync_method > 1)
663             av_strlcatf(args, sizeof(args), ":max_soft_comp=%f", audio_sync_method/(double)ist->st->codec->sample_rate);
664         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
665     }
666
667 //     if (ost->audio_channels_mapped) {
668 //         int i;
669 //         AVBPrint pan_buf;
670 //         av_bprint_init(&pan_buf, 256, 8192);
671 //         av_bprintf(&pan_buf, "0x%"PRIx64,
672 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
673 //         for (i = 0; i < ost->audio_channels_mapped; i++)
674 //             if (ost->audio_channels_map[i] != -1)
675 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
676 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
677 //         av_bprint_finalize(&pan_buf, NULL);
678 //     }
679
680     if (audio_volume != 256) {
681         char args[256];
682
683         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
684         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
685     }
686     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
687         return ret;
688
689     return 0;
690 }
691
692 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
693                                   AVFilterInOut *in)
694 {
695     av_freep(&ifilter->name);
696     DESCRIBE_FILTER_LINK(ifilter, in, 1);
697
698     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
699     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
700     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
701     default: av_assert0(0);
702     }
703 }
704
705 int configure_filtergraph(FilterGraph *fg)
706 {
707     AVFilterInOut *inputs, *outputs, *cur;
708     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
709     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
710                                       fg->graph_desc;
711
712     avfilter_graph_free(&fg->graph);
713     if (!(fg->graph = avfilter_graph_alloc()))
714         return AVERROR(ENOMEM);
715
716     if (simple) {
717         OutputStream *ost = fg->outputs[0]->ost;
718         char args[255];
719         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
720         fg->graph->scale_sws_opts = av_strdup(args);
721     }
722
723     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
724         return ret;
725
726     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
727         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
728                "exactly one input and output.\n", graph_desc);
729         return AVERROR(EINVAL);
730     }
731
732     for (cur = inputs; !simple && init && cur; cur = cur->next)
733         init_input_filter(fg, cur);
734
735     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
736         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
737             return ret;
738     avfilter_inout_free(&inputs);
739
740     if (!init || simple) {
741         /* we already know the mappings between lavfi outputs and output streams,
742          * so we can finish the setup */
743         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
744             configure_output_filter(fg, fg->outputs[i], cur);
745         avfilter_inout_free(&outputs);
746
747         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
748             return ret;
749     } else {
750         /* wait until output mappings are processed */
751         for (cur = outputs; cur;) {
752             fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
753                                      &fg->nb_outputs, fg->nb_outputs + 1);
754             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
755                 exit_program(1);
756             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
757             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
758             cur = cur->next;
759             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
760         }
761     }
762
763     return 0;
764 }
765
766 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
767 {
768     int i;
769     for (i = 0; i < fg->nb_inputs; i++)
770         if (fg->inputs[i]->ist == ist)
771             return 1;
772     return 0;
773 }
774