aboutsummaryrefslogtreecommitdiffstats
path: root/ffprobe.c
blob: e00805afa2b1c55e4e9dc2c27be13160f2959fec (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
/*
 * ffprobe : Simple Media Prober based on the FFmpeg libraries
 * Copyright (c) 2007-2010 Stefano Sabatini
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config.h"

#include "libavformat/avformat.h"
#include "libavcodec/avcodec.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/dict.h"
#include "libavdevice/avdevice.h"
#include "cmdutils.h"

const char program_name[] = "ffprobe";
const int program_birth_year = 2007;

static int do_show_format  = 0;
static int do_show_packets = 0;
static int do_show_streams = 0;

static int show_value_unit              = 0;
static int use_value_prefix             = 0;
static int use_byte_value_binary_prefix = 0;
static int use_value_sexagesimal_format = 0;

static char *print_format;

static const OptionDef options[];

/* FFprobe context */
static const char *input_filename;
static AVInputFormat *iformat = NULL;

static const char *binary_unit_prefixes [] = { "", "Ki", "Mi", "Gi", "Ti", "Pi" };
static const char *decimal_unit_prefixes[] = { "", "K" , "M" , "G" , "T" , "P"  };

static const char *unit_second_str          = "s"    ;
static const char *unit_hertz_str           = "Hz"   ;
static const char *unit_byte_str            = "byte" ;
static const char *unit_bit_per_second_str  = "bit/s";

void exit_program(int ret)
{
    exit(ret);
}

static char *value_string(char *buf, int buf_size, double val, const char *unit)
{
    if (unit == unit_second_str && use_value_sexagesimal_format) {
        double secs;
        int hours, mins;
        secs  = val;
        mins  = (int)secs / 60;
        secs  = secs - mins * 60;
        hours = mins / 60;
        mins %= 60;
        snprintf(buf, buf_size, "%d:%02d:%09.6f", hours, mins, secs);
    } else if (use_value_prefix) {
        const char *prefix_string;
        int index;

        if (unit == unit_byte_str && use_byte_value_binary_prefix) {
            index = (int) (log(val)/log(2)) / 10;
            index = av_clip(index, 0, FF_ARRAY_ELEMS(binary_unit_prefixes) -1);
            val /= pow(2, index*10);
            prefix_string = binary_unit_prefixes[index];
        } else {
            index = (int) (log10(val)) / 3;
            index = av_clip(index, 0, FF_ARRAY_ELEMS(decimal_unit_prefixes) -1);
            val /= pow(10, index*3);
            prefix_string = decimal_unit_prefixes[index];
        }

        snprintf(buf, buf_size, "%.3f%s%s%s", val, prefix_string || show_value_unit ? " " : "",
                 prefix_string, show_value_unit ? unit : "");
    } else {
        snprintf(buf, buf_size, "%f%s%s", val, show_value_unit ? " " : "",
                 show_value_unit ? unit : "");
    }

    return buf;
}

static char *time_value_string(char *buf, int buf_size, int64_t val, const AVRational *time_base)
{
    if (val == AV_NOPTS_VALUE) {
        snprintf(buf, buf_size, "N/A");
    } else {
        value_string(buf, buf_size, val * av_q2d(*time_base), unit_second_str);
    }

    return buf;
}

static char *ts_value_string (char *buf, int buf_size, int64_t ts)
{
    if (ts == AV_NOPTS_VALUE) {
        snprintf(buf, buf_size, "N/A");
    } else {
        snprintf(buf, buf_size, "%"PRId64, ts);
    }

    return buf;
}

/* WRITERS API */

typedef struct WriterContext WriterContext;

typedef struct Writer {
    int priv_size;                  ///< private size for the writer context
    const char *name;

    int  (*init)  (WriterContext *wctx, const char *args, void *opaque);
    void (*uninit)(WriterContext *wctx);

    void (*print_header)(WriterContext *ctx);
    void (*print_footer)(WriterContext *ctx);

    void (*print_chapter_header)(WriterContext *wctx, const char *);
    void (*print_chapter_footer)(WriterContext *wctx, const char *);
    void (*print_section_header)(WriterContext *wctx, const char *);
    void (*print_section_footer)(WriterContext *wctx, const char *);
    void (*print_integer)       (WriterContext *wctx, const char *, int);
    void (*print_string)        (WriterContext *wctx, const char *, const char *);
    void (*show_tags)           (WriterContext *wctx, AVDictionary *dict);
} Writer;

struct WriterContext {
    const AVClass *class;           ///< class of the writer
    const Writer *writer;           ///< the Writer of which this is an instance
    char *name;                     ///< name of this writer instance
    void *priv;                     ///< private data for use by the filter
    unsigned int nb_item;           ///< number of the item printed in the given section, starting at 0
    unsigned int nb_section;        ///< number of the section printed in the given section sequence, starting at 0
    unsigned int nb_chapter;        ///< number of the chapter, starting at 0
};

static const char *writer_get_name(void *p)
{
    WriterContext *wctx = p;
    return wctx->writer->name;
}

static const AVClass writer_class = {
    "Writer",
    writer_get_name,
    NULL,
    LIBAVUTIL_VERSION_INT,
};

static void writer_close(WriterContext **wctx)
{
    if (*wctx && (*wctx)->writer->uninit)
        (*wctx)->writer->uninit(*wctx);

    av_freep(&((*wctx)->priv));
    av_freep(wctx);
}

static int writer_open(WriterContext **wctx, const Writer *writer,
                       const char *args, void *opaque)
{
    int ret = 0;

    if (!(*wctx = av_malloc(sizeof(WriterContext)))) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    if (!((*wctx)->priv = av_mallocz(writer->priv_size))) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    (*wctx)->class = &writer_class;
    (*wctx)->writer = writer;
    if ((*wctx)->writer->init)
        ret = (*wctx)->writer->init(*wctx, args, opaque);
    if (ret < 0)
        goto fail;

    return 0;

fail:
    writer_close(wctx);
    return ret;
}

static inline void writer_print_header(WriterContext *wctx)
{
    if (wctx->writer->print_header)
        wctx->writer->print_header(wctx);
    wctx->nb_chapter = 0;
}

static inline void writer_print_footer(WriterContext *wctx)
{
    if (wctx->writer->print_footer)
        wctx->writer->print_footer(wctx);
}

static inline void writer_print_chapter_header(WriterContext *wctx,
                                               const char *header)
{
    if (wctx->writer->print_chapter_header)
        wctx->writer->print_chapter_header(wctx, header);
    wctx->nb_section = 0;
}

static inline void writer_print_chapter_footer(WriterContext *wctx,
                                               const char *footer)
{
    if (wctx->writer->print_chapter_footer)
        wctx->writer->print_chapter_footer(wctx, footer);
    wctx->nb_chapter++;
}

static inline void writer_print_section_header(WriterContext *wctx,
                                               const char *header)
{
    if (wctx->writer->print_section_header)
        wctx->writer->print_section_header(wctx, header);
    wctx->nb_item = 0;
}

static inline void writer_print_section_footer(WriterContext *wctx,
                                               const char *footer)
{
    if (wctx->writer->print_section_footer)
        wctx->writer->print_section_footer(wctx, footer);
    wctx->nb_section++;
}

static inline void writer_print_integer(WriterContext *wctx,
                                        const char *key, int val)
{
    wctx->writer->print_integer(wctx, key, val);
    wctx->nb_item++;
}

static inline void writer_print_string(WriterContext *wctx,
                                       const char *key, const char *val)
{
    wctx->writer->print_string(wctx, key, val);
    wctx->nb_item++;
}

static inline void writer_show_tags(WriterContext *wctx, AVDictionary *dict)
{
    wctx->writer->show_tags(wctx, dict);
}

#define MAX_REGISTERED_WRITERS_NB 64

static Writer *registered_writers[MAX_REGISTERED_WRITERS_NB + 1];

static int writer_register(Writer *writer)
{
    static int next_registered_writer_idx = 0;

    if (next_registered_writer_idx == MAX_REGISTERED_WRITERS_NB)
        return AVERROR(ENOMEM);

    registered_writers[next_registered_writer_idx++] = writer;
    return 0;
}

static Writer *writer_get_by_name(const char *name)
{
    int i;

    for (i = 0; registered_writers[i]; i++)
        if (!strcmp(registered_writers[i]->name, name))
            return registered_writers[i];

    return NULL;
}

/* Print helpers */

struct print_buf {
    char *s;
    int len;
};

static char *fast_asprintf(struct print_buf *pbuf, const char *fmt, ...)
{
    va_list va;
    int len;

    va_start(va, fmt);
    len = vsnprintf(NULL, 0, fmt, va);
    va_end(va);
    if (len < 0)
        goto fail;

    if (pbuf->len < len) {
        char *p = av_realloc(pbuf->s, len + 1);
        if (!p)
            goto fail;
        pbuf->s   = p;
        pbuf->len = len;
    }

    va_start(va, fmt);
    len = vsnprintf(pbuf->s, len + 1, fmt, va);
    va_end(va);
    if (len < 0)
        goto fail;
    return pbuf->s;

fail:
    av_freep(&pbuf->s);
    pbuf->len = 0;
    return NULL;
}

#define ESCAPE_INIT_BUF_SIZE 256

#define ESCAPE_CHECK_SIZE(src, size, max_size)                          \
    if (size > max_size) {                                              \
        char buf[64];                                                   \
        snprintf(buf, sizeof(buf), "%s", src);                          \
        av_log(log_ctx, AV_LOG_WARNING,                                 \
               "String '%s...' with is too big\n", buf);                \
        return "FFPROBE_TOO_BIG_STRING";                                \
    }

#define ESCAPE_REALLOC_BUF(dst_size_p, dst_p, src, size)                \
    if (*dst_size_p < size) {                                           \
        char *q = av_realloc(*dst_p, size);                             \
        if (!q) {                                                       \
            char buf[64];                                               \
            snprintf(buf, sizeof(buf), "%s", src);                      \
            av_log(log_ctx, AV_LOG_WARNING,                             \
                   "String '%s...' could not be escaped\n", buf);       \
            return "FFPROBE_THIS_STRING_COULD_NOT_BE_ESCAPED";          \
        }                                                               \
        *dst_size_p = size;                                             \
        *dst = q;                                                       \
    }

/* WRITERS */

/* Default output */

static void default_print_footer(WriterContext *wctx)
{
    printf("\n");
}

static void default_print_chapter_header(WriterContext *wctx, const char *chapter)
{
    if (wctx->nb_chapter)
        printf("\n");
}

/* lame uppercasing routine, assumes the string is lower case ASCII */
static inline char *upcase_string(char *dst, size_t dst_size, const char *src)
{
    int i;
    for (i = 0; src[i] && i < dst_size-1; i++)
        dst[i] = src[i]-32;
    dst[i] = 0;
    return dst;
}

static void default_print_section_header(WriterContext *wctx, const char *section)
{
    char buf[32];

    if (wctx->nb_section)
        printf("\n");
    printf("[%s]\n", upcase_string(buf, sizeof(buf), section));
}

static void default_print_section_footer(WriterContext *wctx, const char *section)
{
    char buf[32];

    printf("[/%s]", upcase_string(buf, sizeof(buf), section));
}

static void default_print_str(WriterContext *wctx, const char *key, const char *value)
{
    printf("%s=%s\n", key, value);
}

static void default_print_int(WriterContext *wctx, const char *key, int value)
{
    printf("%s=%d\n", key, value);
}

static void default_show_tags(WriterContext *wctx, AVDictionary *dict)
{
    AVDictionaryEntry *tag = NULL;
    while ((tag = av_dict_get(dict, "", tag, AV_DICT_IGNORE_SUFFIX))) {
        printf("TAG:");
        writer_print_string(wctx, tag->key, tag->value);
    }
}

static Writer default_writer = {
    .name                  = "default",
    .print_footer          = default_print_footer,
    .print_chapter_header  = default_print_chapter_header,
    .print_section_header  = default_print_section_header,
    .print_section_footer  = default_print_section_footer,
    .print_integer         = default_print_int,
    .print_string          = default_print_str,
    .show_tags             = default_show_tags
};

/* JSON output */

typedef struct {
    int multiple_entries; ///< tells if the given chapter requires multiple entries
    char *buf;
    size_t buf_size;
} JSONContext;

static av_cold int json_init(WriterContext *wctx, const char *args, void *opaque)
{
    JSONContext *json = wctx->priv;

    json->buf_size = ESCAPE_INIT_BUF_SIZE;
    if (!(json->buf = av_malloc(json->buf_size)))
        return AVERROR(ENOMEM);

    return 0;
}

static av_cold void json_uninit(WriterContext *wctx)
{
    JSONContext *json = wctx->priv;
    av_freep(&json->buf);
}

static const char *json_escape_str(char **dst, size_t *dst_size, const char *src,
                                   void *log_ctx)
{
    static const char json_escape[] = {'"', '\\', '\b', '\f', '\n', '\r', '\t', 0};
    static const char json_subst[]  = {'"', '\\',  'b',  'f',  'n',  'r',  't', 0};
    const char *p;
    char *q;
    size_t size = 1;

    // compute the length of the escaped string
    for (p = src; *p; p++) {
        ESCAPE_CHECK_SIZE(src, size, SIZE_MAX-6);
        if (strchr(json_escape, *p))     size += 2; // simple escape
        else if ((unsigned char)*p < 32) size += 6; // handle non-printable chars
        else                             size += 1; // char copy
    }
    ESCAPE_REALLOC_BUF(dst_size, dst, src, size);

    q = *dst;
    for (p = src; *p; p++) {
        char *s = strchr(json_escape, *p);
        if (s) {
            *q++ = '\\';
            *q++ = json_subst[s - json_escape];
        } else if ((unsigned char)*p < 32) {
            snprintf(q, 7, "\\u00%02x", *p & 0xff);
            q += 6;
        } else {
            *q++ = *p;
        }
    }
    *q = 0;
    return *dst;
}

static void json_print_header(WriterContext *wctx)
{
    printf("{");
}

static void json_print_footer(WriterContext *wctx)
{
    printf("\n}\n");
}

static void json_print_chapter_header(WriterContext *wctx, const char *chapter)
{
    JSONContext *json = wctx->priv;

    if (wctx->nb_chapter)
        printf(",");
    json->multiple_entries = !strcmp(chapter, "packets") || !strcmp(chapter, "streams");
    printf("\n  \"%s\":%s", json_escape_str(&json->buf, &json->buf_size, chapter, wctx),
           json->multiple_entries ? " [" : " ");
}

static void json_print_chapter_footer(WriterContext *wctx, const char *chapter)
{
    JSONContext *json = wctx->priv;

    if (json->multiple_entries)
        printf("]");
}

static void json_print_section_header(WriterContext *wctx, const char *section)
{
    if (wctx->nb_section) printf(",");
    printf("{\n");
}

static void json_print_section_footer(WriterContext *wctx, const char *section)
{
    printf("\n  }");
}

static inline void json_print_item_str(WriterContext *wctx,
                                       const char *key, const char *value,
                                       const char *indent)
{
    JSONContext *json = wctx->priv;

    printf("%s\"%s\":", indent, json_escape_str(&json->buf, &json->buf_size, key,   wctx));
    printf(" \"%s\"",           json_escape_str(&json->buf, &json->buf_size, value, wctx));
}

#define INDENT "    "

static void json_print_str(WriterContext *wctx, const char *key, const char *value)
{
    if (wctx->nb_item) printf(",\n");
    json_print_item_str(wctx, key, value, INDENT);
}

static void json_print_int(WriterContext *wctx, const char *key, int value)
{
    JSONContext *json = wctx->priv;

    if (wctx->nb_item) printf(",\n");
    printf(INDENT "\"%s\": %d",
           json_escape_str(&json->buf, &json->buf_size, key, wctx), value);
}

static void json_show_tags(WriterContext *wctx, AVDictionary *dict)
{
    AVDictionaryEntry *tag = NULL;
    int is_first = 1;
    if (!dict)
        return;
    printf(",\n" INDENT "\"tags\": {\n");
    while ((tag = av_dict_get(dict, "", tag, AV_DICT_IGNORE_SUFFIX))) {
        if (is_first) is_first = 0;
        else          printf(",\n");
        json_print_item_str(wctx, tag->key, tag->value, INDENT INDENT);
    }
    printf("\n    }");
}

static Writer json_writer = {
    .name         = "json",
    .priv_size    = sizeof(JSONContext),

    .init                 = json_init,
    .uninit               = json_uninit,
    .print_header         = json_print_header,
    .print_footer         = json_print_footer,
    .print_chapter_header = json_print_chapter_header,
    .print_chapter_footer = json_print_chapter_footer,
    .print_section_header = json_print_section_header,
    .print_section_footer = json_print_section_footer,
    .print_integer        = json_print_int,
    .print_string         = json_print_str,
    .show_tags            = json_show_tags,
};

static void writer_register_all(void)
{
    static int initialized;

    if (initialized)
        return;
    initialized = 1;

    writer_register(&default_writer);
    writer_register(&json_writer);
}

#define print_fmt(k, f, ...) do {              \
    if (fast_asprintf(&pbuf, f, __VA_ARGS__))  \
        writer_print_string(w, k, pbuf.s);     \
} while (0)

#define print_int(k, v)         writer_print_integer(w, k, v)
#define print_str(k, v)         writer_print_string(w, k, v)
#define print_section_header(s) writer_print_section_header(w, s)
#define print_section_footer(s) writer_print_section_footer(w, s)
#define show_tags(metadata)     writer_show_tags(w, metadata)

static void show_packet(WriterContext *w, AVFormatContext *fmt_ctx, AVPacket *pkt, int packet_idx)
{
    char val_str[128];
    AVStream *st = fmt_ctx->streams[pkt->stream_index];
    struct print_buf pbuf = {.s = NULL};

    print_section_header("packet");
    print_str("codec_type",       av_x_if_null(av_get_media_type_string(st->codec->codec_type), "unknown"));
    print_int("stream_index",     pkt->stream_index);
    print_str("pts",              ts_value_string  (val_str, sizeof(val_str), pkt->pts));
    print_str("pts_time",         time_value_string(val_str, sizeof(val_str), pkt->pts, &st->time_base));
    print_str("dts",              ts_value_string  (val_str, sizeof(val_str), pkt->dts));
    print_str("dts_time",         time_value_string(val_str, sizeof(val_str), pkt->dts, &st->time_base));
    print_str("duration",         ts_value_string  (val_str, sizeof(val_str), pkt->duration));
    print_str("duration_time",    time_value_string(val_str, sizeof(val_str), pkt->duration, &st->time_base));
    print_str("size",             value_string     (val_str, sizeof(val_str), pkt->size, unit_byte_str));
    print_fmt("pos",   "%"PRId64, pkt->pos);
    print_fmt("flags", "%c",      pkt->flags & AV_PKT_FLAG_KEY ? 'K' : '_');
    print_section_footer("packet");

    av_free(pbuf.s);
    fflush(stdout);
}

static void show_packets(WriterContext *w, AVFormatContext *fmt_ctx)
{
    AVPacket pkt;
    int i = 0;

    av_init_packet(&pkt);

    while (!av_read_frame(fmt_ctx, &pkt))
        show_packet(w, fmt_ctx, &pkt, i++);
}

static void show_stream(WriterContext *w, AVFormatContext *fmt_ctx, int stream_idx)
{
    AVStream *stream = fmt_ctx->streams[stream_idx];
    AVCodecContext *dec_ctx;
    AVCodec *dec;
    char val_str[128];
    AVRational display_aspect_ratio;
    struct print_buf pbuf = {.s = NULL};

    print_section_header("stream");

    print_int("index", stream->index);

    if ((dec_ctx = stream->codec)) {
        if ((dec = dec_ctx->codec)) {
            print_str("codec_name",      dec->name);
            print_str("codec_long_name", dec->long_name);
        } else {
            print_str("codec_name",      "unknown");
        }

        print_str("codec_type", av_x_if_null(av_get_media_type_string(dec_ctx->codec_type), "unknown"));
        print_fmt("codec_time_base", "%d/%d", dec_ctx->time_base.num, dec_ctx->time_base.den);

        /* print AVI/FourCC tag */
        av_get_codec_tag_string(val_str, sizeof(val_str), dec_ctx->codec_tag);
        print_str("codec_tag_string",    val_str);
        print_fmt("codec_tag", "0x%04x", dec_ctx->codec_tag);

        switch (dec_ctx->codec_type) {
        case AVMEDIA_TYPE_VIDEO:
            print_int("width",        dec_ctx->width);
            print_int("height",       dec_ctx->height);
            print_int("has_b_frames", dec_ctx->has_b_frames);
            if (dec_ctx->sample_aspect_ratio.num) {
                print_fmt("sample_aspect_ratio", "%d:%d",
                          dec_ctx->sample_aspect_ratio.num,
                          dec_ctx->sample_aspect_ratio.den);
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
                          dec_ctx->width  * dec_ctx->sample_aspect_ratio.num,
                          dec_ctx->height * dec_ctx->sample_aspect_ratio.den,
                          1024*1024);
                print_fmt("display_aspect_ratio", "%d:%d",
                          display_aspect_ratio.num,
                          display_aspect_ratio.den);
            }
            print_str("pix_fmt", av_x_if_null(av_get_pix_fmt_name(dec_ctx->pix_fmt), "unknown"));
            print_int("level",   dec_ctx->level);
            break;

        case AVMEDIA_TYPE_AUDIO:
            print_str("sample_fmt",
                      av_x_if_null(av_get_sample_fmt_name(dec_ctx->sample_fmt), "unknown"));
            print_str("sample_rate",     value_string(val_str, sizeof(val_str), dec_ctx->sample_rate, unit_hertz_str));
            print_int("channels",        dec_ctx->channels);
            print_int("bits_per_sample", av_get_bits_per_sample(dec_ctx->codec_id));
            break;
        }
    } else {
        print_str("codec_type", "unknown");
    }
    if (dec_ctx->codec && dec_ctx->codec->priv_class) {
        const AVOption *opt = NULL;
        while (opt = av_opt_next(dec_ctx->priv_data,opt)) {
            uint8_t *str;
            if (opt->flags) continue;
            if (av_opt_get(dec_ctx->priv_data, opt->name, 0, &str) >= 0) {
                print_str(opt->name, str);
                av_free(str);
            }
        }
    }

    if (fmt_ctx->iformat->flags & AVFMT_SHOW_IDS)
        print_fmt("id", "0x%x", stream->id);
    print_fmt("r_frame_rate",   "%d/%d", stream->r_frame_rate.num,   stream->r_frame_rate.den);
    print_fmt("avg_frame_rate", "%d/%d", stream->avg_frame_rate.num, stream->avg_frame_rate.den);
    print_fmt("time_base",      "%d/%d", stream->time_base.num,      stream->time_base.den);
    print_str("start_time", time_value_string(val_str, sizeof(val_str), stream->start_time, &stream->time_base));
    print_str("duration",   time_value_string(val_str, sizeof(val_str), stream->duration,   &stream->time_base));
    if (stream->nb_frames)
        print_fmt("nb_frames", "%"PRId64, stream->nb_frames);

    show_tags(stream->metadata);

    print_section_footer("stream");
    av_free(pbuf.s);
    fflush(stdout);
}

static void show_streams(WriterContext *w, AVFormatContext *fmt_ctx)
{
    int i;
    for (i = 0; i < fmt_ctx->nb_streams; i++)
        show_stream(w, fmt_ctx, i);
}

static void show_format(WriterContext *w, AVFormatContext *fmt_ctx)
{
    char val_str[128];
    int64_t size = avio_size(fmt_ctx->pb);
    struct print_buf pbuf = {.s = NULL};

    print_section_header("format");
    print_str("filename",         fmt_ctx->filename);
    print_int("nb_streams",       fmt_ctx->nb_streams);
    print_str("format_name",      fmt_ctx->iformat->name);
    print_str("format_long_name", fmt_ctx->iformat->long_name);
    print_str("start_time",       time_value_string(val_str, sizeof(val_str), fmt_ctx->start_time, &AV_TIME_BASE_Q));
    print_str("duration",         time_value_string(val_str, sizeof(val_str), fmt_ctx->duration,   &AV_TIME_BASE_Q));
    if (size >= 0)
        print_str("size",         value_string(val_str, sizeof(val_str), size,               unit_byte_str));
    print_str("bit_rate",         value_string(val_str, sizeof(val_str), fmt_ctx->bit_rate,  unit_bit_per_second_str));
    show_tags(fmt_ctx->metadata);
    print_section_footer("format");
    av_free(pbuf.s);
    fflush(stdout);
}

static int open_input_file(AVFormatContext **fmt_ctx_ptr, const char *filename)
{
    int err, i;
    AVFormatContext *fmt_ctx = NULL;
    AVDictionaryEntry *t;

    if ((err = avformat_open_input(&fmt_ctx, filename, iformat, &format_opts)) < 0) {
        print_error(filename, err);
        return err;
    }
    if ((t = av_dict_get(format_opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
        av_log(NULL, AV_LOG_ERROR, "Option %s not found.\n", t->key);
        return AVERROR_OPTION_NOT_FOUND;
    }


    /* fill the streams in the format context */
    if ((err = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
        print_error(filename, err);
        return err;
    }

    av_dump_format(fmt_ctx, 0, filename, 0);

    /* bind a decoder to each input stream */
    for (i = 0; i < fmt_ctx->nb_streams; i++) {
        AVStream *stream = fmt_ctx->streams[i];
        AVCodec *codec;

        if (!(codec = avcodec_find_decoder(stream->codec->codec_id))) {
            fprintf(stderr, "Unsupported codec with id %d for input stream %d\n",
                    stream->codec->codec_id, stream->index);
        } else if (avcodec_open2(stream->codec, codec, NULL) < 0) {
            fprintf(stderr, "Error while opening codec for input stream %d\n",
                    stream->index);
        }
    }

    *fmt_ctx_ptr = fmt_ctx;
    return 0;
}

#define PRINT_CHAPTER(name) do {                                        \
    if (do_show_ ## name) {                                             \
        writer_print_chapter_header(wctx, #name);                       \
        show_ ## name (wctx, fmt_ctx);                                  \
        writer_print_chapter_footer(wctx, #name);                       \
    }                                                                   \
} while (0)

static int probe_file(const char *filename)
{
    AVFormatContext *fmt_ctx;
    int ret;
    Writer *w;
    char *buf;
    char *w_name = NULL, *w_args = NULL;
    WriterContext *wctx;

    writer_register_all();

    if (!print_format)
        print_format = av_strdup("default");
    w_name = av_strtok(print_format, "=", &buf);
    w_args = buf;

    w = writer_get_by_name(w_name);
    if (!w) {
        av_log(NULL, AV_LOG_ERROR, "Unknown output format with name '%s'\n", w_name);
        ret = AVERROR(EINVAL);
        goto end;
    }

    if ((ret = writer_open(&wctx, w, w_args, NULL)) < 0)
        goto end;
    if ((ret = open_input_file(&fmt_ctx, filename)))
        goto end;

    writer_print_header(wctx);
    PRINT_CHAPTER(packets);
    PRINT_CHAPTER(streams);
    PRINT_CHAPTER(format);
    writer_print_footer(wctx);

    av_close_input_file(fmt_ctx);
    writer_close(&wctx);

end:
    av_freep(&print_format);

    return ret;
}

static void show_usage(void)
{
    printf("Simple multimedia streams analyzer\n");
    printf("usage: %s [OPTIONS] [INPUT_FILE]\n", program_name);
    printf("\n");
}

static int opt_format(const char *opt, const char *arg)
{
    iformat = av_find_input_format(arg);
    if (!iformat) {
        fprintf(stderr, "Unknown input format: %s\n", arg);
        return AVERROR(EINVAL);
    }
    return 0;
}

static void opt_input_file(void *optctx, const char *arg)
{
    if (input_filename) {
        fprintf(stderr, "Argument '%s' provided as input filename, but '%s' was already specified.\n",
                arg, input_filename);
        exit(1);
    }
    if (!strcmp(arg, "-"))
        arg = "pipe:";
    input_filename = arg;
}

static int opt_help(const char *opt, const char *arg)
{
    av_log_set_callback(log_callback_help);
    show_usage();
    show_help_options(options, "Main options:\n", 0, 0);
    printf("\n");

    show_help_children(avformat_get_class(), AV_OPT_FLAG_DECODING_PARAM);

    return 0;
}

static int opt_pretty(const char *opt, const char *arg)
{
    show_value_unit              = 1;
    use_value_prefix             = 1;
    use_byte_value_binary_prefix = 1;
    use_value_sexagesimal_format = 1;
    return 0;
}

static const OptionDef options[] = {
#include "cmdutils_common_opts.h"
    { "f", HAS_ARG, {(void*)opt_format}, "force format", "format" },
    { "unit", OPT_BOOL, {(void*)&show_value_unit}, "show unit of the displayed values" },
    { "prefix", OPT_BOOL, {(void*)&use_value_prefix}, "use SI prefixes for the displayed values" },
    { "byte_binary_prefix", OPT_BOOL, {(void*)&use_byte_value_binary_prefix},
      "use binary prefixes for byte units" },
    { "sexagesimal", OPT_BOOL,  {(void*)&use_value_sexagesimal_format},
      "use sexagesimal format HOURS:MM:SS.MICROSECONDS for time units" },
    { "pretty", 0, {(void*)&opt_pretty},
      "prettify the format of displayed values, make it more human readable" },
    { "print_format", OPT_STRING | HAS_ARG, {(void*)&print_format}, "set the output printing format (available formats are: default, json)", "format" },
    { "show_format",  OPT_BOOL, {(void*)&do_show_format} , "show format/container info" },
    { "show_packets", OPT_BOOL, {(void*)&do_show_packets}, "show packets info" },
    { "show_streams", OPT_BOOL, {(void*)&do_show_streams}, "show streams info" },
    { "default", HAS_ARG | OPT_AUDIO | OPT_VIDEO | OPT_EXPERT, {(void*)opt_default}, "generic catch all option", "" },
    { "i", HAS_ARG, {(void *)opt_input_file}, "read specified file", "input_file"},
    { NULL, },
};

int main(int argc, char **argv)
{
    int ret;

    parse_loglevel(argc, argv, options);
    av_register_all();
    avformat_network_init();
    init_opts();
#if CONFIG_AVDEVICE
    avdevice_register_all();
#endif

    show_banner();
    parse_options(NULL, argc, argv, options, opt_input_file);

    if (!input_filename) {
        show_usage();
        fprintf(stderr, "You have to specify one input file.\n");
        fprintf(stderr, "Use -h to get full help or, even better, run 'man %s'.\n", program_name);
        exit(1);
    }

    ret = probe_file(input_filename);

    avformat_network_deinit();

    return ret;
}