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  • Committer: Package Import Robot
  • Author(s): Reinhard Tartler
  • Date: 2013-10-22 23:24:08 UTC
  • mfrom: (1.3.36 sid)
  • Revision ID: package-import@ubuntu.com-20131022232408-b8tvvn4pyzri9mi3
Tags: 6:9.10-1ubuntu1
https://launchpad.net/bugs/1243235
https://launchpad.net/bugs/1180288
https://launchpad.net/bugs/1242802
* Build all -extra flavors from this source package, as libav got demoted
  from main to universe, cf LP: #1243235
* Simplify debian/rules to follow exactly the code that debian executes
* New upstream (LP: #1180288) fixes lots of security issues (LP: #1242802)
* Merge from unstable, remaining changes:
  - build-depend on libtiff5-dev rather than libtiff4-dev,
    avoids FTBFS caused by imlib
  - follow the regular debian codepaths

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