aboutsummaryrefslogtreecommitdiffstats
path: root/tools/ismindex.c
blob: 7601f62e06ff51299ac29be23bc9696794e2847f (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
/*
 * Copyright (c) 2012 Martin Storsjo
 *
 * 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
 */

/*
 * To create a simple file for smooth streaming:
 * ffmpeg <normal input/transcoding options> -movflags frag_keyframe foo.ismv
 * ismindex -n foo foo.ismv
 * This step creates foo.ism and foo.ismc that is required by IIS for
 * serving it.
 *
 * With -ismf, it also creates foo.ismf, which maps fragment names to
 * start-end offsets in the ismv, for use in your own streaming server.
 *
 * By adding -path-prefix path/, the produced foo.ism will refer to the
 * files foo.ismv as "path/foo.ismv" - the prefix for the generated ismc
 * file can be set with the -ismc-prefix option similarly.
 *
 * To pre-split files for serving as static files by a web server without
 * any extra server support, create the ismv file as above, and split it:
 * ismindex -split foo.ismv
 * This step creates a file Manifest and directories QualityLevel(...),
 * that can be read directly by a smooth streaming player.
 *
 * The -output dir option can be used to request that output files
 * (both .ism/.ismc, or Manifest/QualityLevels* when splitting)
 * should be written to this directory instead of in the current directory.
 * (The directory itself isn't created if it doesn't already exist.)
 */

#include <stdio.h>
#include <string.h>

#include "libavformat/avformat.h"
#include "libavformat/isom.h"
#include "libavformat/os_support.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"

static int usage(const char *argv0, int ret)
{
    fprintf(stderr, "%s [-split] [-ismf] [-n basename] [-path-prefix prefix] "
                    "[-ismc-prefix prefix] [-output dir] file1 [file2] ...\n", argv0);
    return ret;
}

struct MoofOffset {
    int64_t time;
    int64_t offset;
    int64_t duration;
};

struct Track {
    const char *name;
    int64_t duration;
    int bitrate;
    int track_id;
    int is_audio, is_video;
    int width, height;
    int chunks;
    int sample_rate, channels;
    uint8_t *codec_private;
    int codec_private_size;
    struct MoofOffset *offsets;
    int timescale;
    const char *fourcc;
    int blocksize;
    int tag;
};

struct Tracks {
    int nb_tracks;
    int64_t duration;
    struct Track **tracks;
    int video_track, audio_track;
    int nb_video_tracks, nb_audio_tracks;
};

static int expect_tag(int32_t got_tag, int32_t expected_tag) {
    if (got_tag != expected_tag) {
        char got_tag_str[4], expected_tag_str[4];
        AV_WB32(got_tag_str, got_tag);
        AV_WB32(expected_tag_str, expected_tag);
        fprintf(stderr, "wanted tag %.4s, got %.4s\n", expected_tag_str,
                got_tag_str);
        return -1;
    }
    return 0;
}

static int copy_tag(AVIOContext *in, AVIOContext *out, int32_t tag_name)
{
    int32_t size, tag;

    size = avio_rb32(in);
    tag  = avio_rb32(in);
    avio_wb32(out, size);
    avio_wb32(out, tag);
    if (expect_tag(tag, tag_name) != 0)
        return -1;
    size -= 8;
    while (size > 0) {
        char buf[1024];
        int len = FFMIN(sizeof(buf), size);
        int got;
        if ((got = avio_read(in, buf, len)) != len) {
            fprintf(stderr, "short read, wanted %d, got %d\n", len, got);
            break;
        }
        avio_write(out, buf, len);
        size -= len;
    }
    return 0;
}

static int skip_tag(AVIOContext *in, int32_t tag_name)
{
    int64_t pos = avio_tell(in);
    int32_t size, tag;

    size = avio_rb32(in);
    tag  = avio_rb32(in);
    if (expect_tag(tag, tag_name) != 0)
        return -1;
    avio_seek(in, pos + size, SEEK_SET);
    return 0;
}

static int write_fragment(const char *filename, AVIOContext *in)
{
    AVIOContext *out = NULL;
    int ret;

    if ((ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, NULL, NULL)) < 0) {
        char errbuf[100];
        av_strerror(ret, errbuf, sizeof(errbuf));
        fprintf(stderr, "Unable to open %s: %s\n", filename, errbuf);
        return ret;
    }
    ret = copy_tag(in, out, MKBETAG('m', 'o', 'o', 'f'));
    if (!ret)
        ret = copy_tag(in, out, MKBETAG('m', 'd', 'a', 't'));

    avio_flush(out);
    avio_close(out);

    return ret;
}

static int skip_fragment(AVIOContext *in)
{
    int ret;
    ret = skip_tag(in, MKBETAG('m', 'o', 'o', 'f'));
    if (!ret)
        ret = skip_tag(in, MKBETAG('m', 'd', 'a', 't'));
    return ret;
}

static int write_fragments(struct Tracks *tracks, int start_index,
                           AVIOContext *in, const char *basename,
                           int split, int ismf, const char* output_prefix)
{
    char dirname[2048], filename[2048], idxname[2048];
    int i, j, ret = 0, fragment_ret;
    FILE* out = NULL;

    if (ismf) {
        snprintf(idxname, sizeof(idxname), "%s%s.ismf", output_prefix, basename);
        out = fopen(idxname, "w");
        if (!out) {
            ret = AVERROR(errno);
            perror(idxname);
            goto fail;
        }
    }
    for (i = start_index; i < tracks->nb_tracks; i++) {
        struct Track *track = tracks->tracks[i];
        const char *type    = track->is_video ? "video" : "audio";
        snprintf(dirname, sizeof(dirname), "%sQualityLevels(%d)", output_prefix, track->bitrate);
        if (split) {
            if (mkdir(dirname, 0777) == -1 && errno != EEXIST) {
                ret = AVERROR(errno);
                perror(dirname);
                goto fail;
            }
        }
        for (j = 0; j < track->chunks; j++) {
            snprintf(filename, sizeof(filename), "%s/Fragments(%s=%"PRId64")",
                     dirname, type, track->offsets[j].time);
            avio_seek(in, track->offsets[j].offset, SEEK_SET);
            if (ismf)
                fprintf(out, "%s %"PRId64, filename, avio_tell(in));
            if (split)
                fragment_ret = write_fragment(filename, in);
            else
                fragment_ret = skip_fragment(in);
            if (ismf)
                fprintf(out, " %"PRId64"\n", avio_tell(in));
            if (fragment_ret != 0) {
                fprintf(stderr, "failed fragment %d in track %d (%s)\n", j,
                        track->track_id, track->name);
                ret = fragment_ret;
            }
        }
    }
fail:
    if (out)
        fclose(out);
    return ret;
}

static int64_t read_trun_duration(AVIOContext *in, int default_duration,
                                  int64_t end)
{
    int64_t dts = 0;
    int64_t pos;
    int flags, i;
    int entries;
    int64_t first_pts = 0;
    int64_t max_pts = 0;
    avio_r8(in); /* version */
    flags = avio_rb24(in);
    if (default_duration <= 0 && !(flags & MOV_TRUN_SAMPLE_DURATION)) {
        fprintf(stderr, "No sample duration in trun flags\n");
        return -1;
    }
    entries = avio_rb32(in);

    if (flags & MOV_TRUN_DATA_OFFSET)        avio_rb32(in);
    if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) avio_rb32(in);

    pos = avio_tell(in);
    for (i = 0; i < entries && pos < end; i++) {
        int sample_duration = default_duration;
        int64_t pts = dts;
        if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(in);
        if (flags & MOV_TRUN_SAMPLE_SIZE)     avio_rb32(in);
        if (flags & MOV_TRUN_SAMPLE_FLAGS)    avio_rb32(in);
        if (flags & MOV_TRUN_SAMPLE_CTS)      pts += avio_rb32(in);
        if (sample_duration < 0) {
            fprintf(stderr, "Negative sample duration %d\n", sample_duration);
            return -1;
        }
        if (i == 0)
            first_pts = pts;
        max_pts = FFMAX(max_pts, pts + sample_duration);
        dts += sample_duration;
        pos = avio_tell(in);
    }

    return max_pts - first_pts;
}

static int64_t read_moof_duration(AVIOContext *in, int64_t offset)
{
    int64_t ret = -1;
    int32_t moof_size, size, tag;
    int64_t pos = 0;
    int default_duration = 0;

    avio_seek(in, offset, SEEK_SET);
    moof_size = avio_rb32(in);
    tag  = avio_rb32(in);
    if (expect_tag(tag, MKBETAG('m', 'o', 'o', 'f')) != 0)
        goto fail;
    while (pos < offset + moof_size) {
        pos = avio_tell(in);
        size = avio_rb32(in);
        tag  = avio_rb32(in);
        if (tag == MKBETAG('t', 'r', 'a', 'f')) {
            int64_t traf_pos = pos;
            int64_t traf_size = size;
            while (pos < traf_pos + traf_size) {
                pos = avio_tell(in);
                size = avio_rb32(in);
                tag  = avio_rb32(in);
                if (tag == MKBETAG('t', 'f', 'h', 'd')) {
                    int flags = 0;
                    avio_r8(in); /* version */
                    flags = avio_rb24(in);
                    avio_rb32(in); /* track_id */
                    if (flags & MOV_TFHD_BASE_DATA_OFFSET)
                        avio_rb64(in);
                    if (flags & MOV_TFHD_STSD_ID)
                        avio_rb32(in);
                    if (flags & MOV_TFHD_DEFAULT_DURATION)
                        default_duration = avio_rb32(in);
                }
                if (tag == MKBETAG('t', 'r', 'u', 'n')) {
                    return read_trun_duration(in, default_duration,
                                              pos + size);
                }
                avio_seek(in, pos + size, SEEK_SET);
            }
            fprintf(stderr, "Couldn't find trun\n");
            goto fail;
        }
        avio_seek(in, pos + size, SEEK_SET);
    }
    fprintf(stderr, "Couldn't find traf\n");

fail:
    return ret;
}

static int read_tfra(struct Tracks *tracks, int start_index, AVIOContext *f)
{
    int ret = AVERROR_EOF, track_id;
    int version, fieldlength, i, j;
    int64_t pos   = avio_tell(f);
    uint32_t size = avio_rb32(f);
    struct Track *track = NULL;

    if (avio_rb32(f) != MKBETAG('t', 'f', 'r', 'a'))
        goto fail;
    version = avio_r8(f);
    avio_rb24(f);
    track_id = avio_rb32(f); /* track id */
    for (i = start_index; i < tracks->nb_tracks && !track; i++)
        if (tracks->tracks[i]->track_id == track_id)
            track = tracks->tracks[i];
    if (!track) {
        /* Ok, continue parsing the next atom */
        ret = 0;
        goto fail;
    }
    fieldlength = avio_rb32(f);
    track->chunks  = avio_rb32(f);
    track->offsets = av_mallocz_array(track->chunks, sizeof(*track->offsets));
    if (!track->offsets) {
        track->chunks = 0;
        ret = AVERROR(ENOMEM);
        goto fail;
    }
    // The duration here is always the difference between consecutive
    // start times.
    for (i = 0; i < track->chunks; i++) {
        if (version == 1) {
            track->offsets[i].time   = avio_rb64(f);
            track->offsets[i].offset = avio_rb64(f);
        } else {
            track->offsets[i].time   = avio_rb32(f);
            track->offsets[i].offset = avio_rb32(f);
        }
        for (j = 0; j < ((fieldlength >> 4) & 3) + 1; j++)
            avio_r8(f);
        for (j = 0; j < ((fieldlength >> 2) & 3) + 1; j++)
            avio_r8(f);
        for (j = 0; j < ((fieldlength >> 0) & 3) + 1; j++)
            avio_r8(f);
        if (i > 0)
            track->offsets[i - 1].duration = track->offsets[i].time -
                                             track->offsets[i - 1].time;
    }
    if (track->chunks > 0) {
        track->offsets[track->chunks - 1].duration = track->offsets[0].time +
                                                     track->duration -
                                                     track->offsets[track->chunks - 1].time;
    }
    // Now try to read the actual durations from the trun sample data.
    for (i = 0; i < track->chunks; i++) {
        int64_t duration = read_moof_duration(f, track->offsets[i].offset);
        if (duration > 0 && llabs(duration - track->offsets[i].duration) > 3) {
            // 3 allows for integer duration to drift a few units,
            // e.g., for 1/3 durations
            track->offsets[i].duration = duration;
        }
    }
    if (track->chunks > 0) {
        if (track->offsets[track->chunks - 1].duration <= 0) {
            fprintf(stderr, "Calculated last chunk duration for track %d "
                    "was non-positive (%"PRId64"), probably due to missing "
                    "fragments ", track->track_id,
                    track->offsets[track->chunks - 1].duration);
            if (track->chunks > 1) {
                track->offsets[track->chunks - 1].duration =
                    track->offsets[track->chunks - 2].duration;
            } else {
                track->offsets[track->chunks - 1].duration = 1;
            }
            fprintf(stderr, "corrected to %"PRId64"\n",
                    track->offsets[track->chunks - 1].duration);
            track->duration = track->offsets[track->chunks - 1].time +
                              track->offsets[track->chunks - 1].duration -
                              track->offsets[0].time;
            fprintf(stderr, "Track duration corrected to %"PRId64"\n",
                    track->duration);
        }
    }
    ret = 0;

fail:
    avio_seek(f, pos + size, SEEK_SET);
    return ret;
}

static int read_mfra(struct Tracks *tracks, int start_index,
                     const char *file, int split, int ismf,
                     const char *basename, const char* output_prefix)
{
    int err = 0;
    const char* err_str = "";
    AVIOContext *f = NULL;
    int32_t mfra_size;

    if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
        goto fail;
    avio_seek(f, avio_size(f) - 4, SEEK_SET);
    mfra_size = avio_rb32(f);
    avio_seek(f, -mfra_size, SEEK_CUR);
    if (avio_rb32(f) != mfra_size) {
        err = AVERROR_INVALIDDATA;
        err_str = "mfra size mismatch";
        goto fail;
    }
    if (avio_rb32(f) != MKBETAG('m', 'f', 'r', 'a')) {
        err = AVERROR_INVALIDDATA;
        err_str = "mfra tag mismatch";
        goto fail;
    }
    while (!read_tfra(tracks, start_index, f)) {
        /* Empty */
    }

    if (split || ismf)
        err = write_fragments(tracks, start_index, f, basename, split, ismf,
                              output_prefix);
    err_str = "error in write_fragments";

fail:
    if (f)
        avio_close(f);
    if (err)
        fprintf(stderr, "Unable to read the MFRA atom in %s (%s)\n", file, err_str);
    return err;
}

static int get_private_data(struct Track *track, AVCodecParameters *codecpar)
{
    track->codec_private_size = 0;
    track->codec_private      = av_mallocz(codecpar->extradata_size);
    if (!track->codec_private)
        return AVERROR(ENOMEM);
    track->codec_private_size = codecpar->extradata_size;
    memcpy(track->codec_private, codecpar->extradata, codecpar->extradata_size);
    return 0;
}

static int get_video_private_data(struct Track *track, AVCodecParameters *codecpar)
{
    AVIOContext *io = NULL;
    uint16_t sps_size, pps_size;
    int err;

    if (codecpar->codec_id == AV_CODEC_ID_VC1)
        return get_private_data(track, codecpar);

    if ((err = avio_open_dyn_buf(&io)) < 0)
        goto fail;
    err = AVERROR(EINVAL);
    if (codecpar->extradata_size < 11 || codecpar->extradata[0] != 1)
        goto fail;
    sps_size = AV_RB16(&codecpar->extradata[6]);
    if (11 + sps_size > codecpar->extradata_size)
        goto fail;
    avio_wb32(io, 0x00000001);
    avio_write(io, &codecpar->extradata[8], sps_size);
    pps_size = AV_RB16(&codecpar->extradata[9 + sps_size]);
    if (11 + sps_size + pps_size > codecpar->extradata_size)
        goto fail;
    avio_wb32(io, 0x00000001);
    avio_write(io, &codecpar->extradata[11 + sps_size], pps_size);
    err = 0;

fail:
    track->codec_private_size = avio_close_dyn_buf(io, &track->codec_private);
    return err;
}

static int handle_file(struct Tracks *tracks, const char *file, int split,
                       int ismf, const char *basename,
                       const char* output_prefix)
{
    AVFormatContext *ctx = NULL;
    int err = 0, i, orig_tracks = tracks->nb_tracks;
    char errbuf[50], *ptr;
    struct Track *track;

    err = avformat_open_input(&ctx, file, NULL, NULL);
    if (err < 0) {
        av_strerror(err, errbuf, sizeof(errbuf));
        fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
        return 1;
    }

    err = avformat_find_stream_info(ctx, NULL);
    if (err < 0) {
        av_strerror(err, errbuf, sizeof(errbuf));
        fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
        goto fail;
    }

    if (ctx->nb_streams < 1) {
        fprintf(stderr, "No streams found in %s\n", file);
        goto fail;
    }

    for (i = 0; i < ctx->nb_streams; i++) {
        struct Track **temp;
        AVStream *st = ctx->streams[i];

        if (st->codecpar->bit_rate == 0) {
            fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
                    st->id, file);
            continue;
        }

        track = av_mallocz(sizeof(*track));
        if (!track) {
            err = AVERROR(ENOMEM);
            goto fail;
        }
        temp = av_realloc_array(tracks->tracks,
                                tracks->nb_tracks + 1,
                                sizeof(*tracks->tracks));
        if (!temp) {
            av_free(track);
            err = AVERROR(ENOMEM);
            goto fail;
        }
        tracks->tracks = temp;
        tracks->tracks[tracks->nb_tracks] = track;

        track->name = file;
        if ((ptr = strrchr(file, '/')))
            track->name = ptr + 1;

        track->bitrate   = st->codecpar->bit_rate;
        track->track_id  = st->id;
        track->timescale = st->time_base.den;
        track->duration  = st->duration;
        track->is_audio  = st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
        track->is_video  = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;

        if (!track->is_audio && !track->is_video) {
            fprintf(stderr,
                    "Track %d in %s is neither video nor audio, skipping\n",
                    track->track_id, file);
            av_freep(&tracks->tracks[tracks->nb_tracks]);
            continue;
        }

        tracks->duration = FFMAX(tracks->duration,
                                 av_rescale_rnd(track->duration, AV_TIME_BASE,
                                                track->timescale, AV_ROUND_UP));

        if (track->is_audio) {
            if (tracks->audio_track < 0)
                tracks->audio_track = tracks->nb_tracks;
            tracks->nb_audio_tracks++;
            track->channels    = st->codecpar->channels;
            track->sample_rate = st->codecpar->sample_rate;
            if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
                track->fourcc    = "AACL";
                track->tag       = 255;
                track->blocksize = 4;
            } else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
                track->fourcc    = "WMAP";
                track->tag       = st->codecpar->codec_tag;
                track->blocksize = st->codecpar->block_align;
            }
            get_private_data(track, st->codecpar);
        }
        if (track->is_video) {
            if (tracks->video_track < 0)
                tracks->video_track = tracks->nb_tracks;
            tracks->nb_video_tracks++;
            track->width  = st->codecpar->width;
            track->height = st->codecpar->height;
            if (st->codecpar->codec_id == AV_CODEC_ID_H264)
                track->fourcc = "H264";
            else if (st->codecpar->codec_id == AV_CODEC_ID_VC1)
                track->fourcc = "WVC1";
            get_video_private_data(track, st->codecpar);
        }

        tracks->nb_tracks++;
    }

    avformat_close_input(&ctx);

    err = read_mfra(tracks, orig_tracks, file, split, ismf, basename,
                    output_prefix);

fail:
    if (ctx)
        avformat_close_input(&ctx);
    return err;
}

static void output_server_manifest(struct Tracks *tracks, const char *basename,
                                   const char *output_prefix,
                                   const char *path_prefix,
                                   const char *ismc_prefix)
{
    char filename[1000];
    FILE *out;
    int i;

    snprintf(filename, sizeof(filename), "%s%s.ism", output_prefix, basename);
    out = fopen(filename, "w");
    if (!out) {
        perror(filename);
        return;
    }
    fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
    fprintf(out, "<smil xmlns=\"http://www.w3.org/2001/SMIL20/Language\">\n");
    fprintf(out, "\t<head>\n");
    fprintf(out, "\t\t<meta name=\"clientManifestRelativePath\" "
                 "content=\"%s%s.ismc\" />\n", ismc_prefix, basename);
    fprintf(out, "\t</head>\n");
    fprintf(out, "\t<body>\n");
    fprintf(out, "\t\t<switch>\n");
    for (i = 0; i < tracks->nb_tracks; i++) {
        struct Track *track = tracks->tracks[i];
        const char *type    = track->is_video ? "video" : "audio";
        fprintf(out, "\t\t\t<%s src=\"%s%s\" systemBitrate=\"%d\">\n",
                type, path_prefix, track->name, track->bitrate);
        fprintf(out, "\t\t\t\t<param name=\"trackID\" value=\"%d\" "
                     "valueType=\"data\" />\n", track->track_id);
        fprintf(out, "\t\t\t</%s>\n", type);
    }
    fprintf(out, "\t\t</switch>\n");
    fprintf(out, "\t</body>\n");
    fprintf(out, "</smil>\n");
    fclose(out);
}

static void print_track_chunks(FILE *out, struct Tracks *tracks, int main,
                               const char *type)
{
    int i, j;
    int64_t pos = 0;
    struct Track *track = tracks->tracks[main];
    int should_print_time_mismatch = 1;

    for (i = 0; i < track->chunks; i++) {
        for (j = main + 1; j < tracks->nb_tracks; j++) {
            if (tracks->tracks[j]->is_audio == track->is_audio) {
                if (track->offsets[i].duration != tracks->tracks[j]->offsets[i].duration) {
                    fprintf(stderr, "Mismatched duration of %s chunk %d in %s (%d) and %s (%d)\n",
                            type, i, track->name, main, tracks->tracks[j]->name, j);
                    should_print_time_mismatch = 1;
                }
                if (track->offsets[i].time != tracks->tracks[j]->offsets[i].time) {
                    if (should_print_time_mismatch)
                        fprintf(stderr, "Mismatched (start) time of %s chunk %d in %s (%d) and %s (%d)\n",
                                type, i, track->name, main, tracks->tracks[j]->name, j);
                    should_print_time_mismatch = 0;
                }
            }
        }
        fprintf(out, "\t\t<c n=\"%d\" d=\"%"PRId64"\" ",
                i, track->offsets[i].duration);
        if (pos != track->offsets[i].time) {
            fprintf(out, "t=\"%"PRId64"\" ", track->offsets[i].time);
            pos = track->offsets[i].time;
        }
        pos += track->offsets[i].duration;
        fprintf(out, "/>\n");
    }
}

static void output_client_manifest(struct Tracks *tracks, const char *basename,
                                   const char *output_prefix, int split)
{
    char filename[1000];
    FILE *out;
    int i, j;

    if (split)
        snprintf(filename, sizeof(filename), "%sManifest", output_prefix);
    else
        snprintf(filename, sizeof(filename), "%s%s.ismc", output_prefix, basename);
    out = fopen(filename, "w");
    if (!out) {
        perror(filename);
        return;
    }
    fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
    fprintf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" "
                 "Duration=\"%"PRId64 "\">\n", tracks->duration * 10);
    if (tracks->video_track >= 0) {
        struct Track *track = tracks->tracks[tracks->video_track];
        struct Track *first_track = track;
        int index = 0;
        fprintf(out,
                "\t<StreamIndex Type=\"video\" QualityLevels=\"%d\" "
                "Chunks=\"%d\" "
                "Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n",
                tracks->nb_video_tracks, track->chunks);
        for (i = 0; i < tracks->nb_tracks; i++) {
            track = tracks->tracks[i];
            if (!track->is_video)
                continue;
            fprintf(out,
                    "\t\t<QualityLevel Index=\"%d\" Bitrate=\"%d\" "
                    "FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" "
                    "CodecPrivateData=\"",
                    index, track->bitrate, track->fourcc, track->width, track->height);
            for (j = 0; j < track->codec_private_size; j++)
                fprintf(out, "%02X", track->codec_private[j]);
            fprintf(out, "\" />\n");
            index++;
            if (track->chunks != first_track->chunks)
                fprintf(stderr, "Mismatched number of video chunks in %s (id: %d, chunks %d) and %s (id: %d, chunks %d)\n",
                        track->name, track->track_id, track->chunks, first_track->name, first_track->track_id, first_track->chunks);
        }
        print_track_chunks(out, tracks, tracks->video_track, "video");
        fprintf(out, "\t</StreamIndex>\n");
    }
    if (tracks->audio_track >= 0) {
        struct Track *track = tracks->tracks[tracks->audio_track];
        struct Track *first_track = track;
        int index = 0;
        fprintf(out,
                "\t<StreamIndex Type=\"audio\" QualityLevels=\"%d\" "
                "Chunks=\"%d\" "
                "Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n",
                tracks->nb_audio_tracks, track->chunks);
        for (i = 0; i < tracks->nb_tracks; i++) {
            track = tracks->tracks[i];
            if (!track->is_audio)
                continue;
            fprintf(out,
                    "\t\t<QualityLevel Index=\"%d\" Bitrate=\"%d\" "
                    "FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" "
                    "BitsPerSample=\"16\" PacketSize=\"%d\" "
                    "AudioTag=\"%d\" CodecPrivateData=\"",
                    index, track->bitrate, track->fourcc, track->sample_rate,
                    track->channels, track->blocksize, track->tag);
            for (j = 0; j < track->codec_private_size; j++)
                fprintf(out, "%02X", track->codec_private[j]);
            fprintf(out, "\" />\n");
            index++;
            if (track->chunks != first_track->chunks)
                fprintf(stderr, "Mismatched number of audio chunks in %s and %s\n",
                        track->name, first_track->name);
        }
        print_track_chunks(out, tracks, tracks->audio_track, "audio");
        fprintf(out, "\t</StreamIndex>\n");
    }
    fprintf(out, "</SmoothStreamingMedia>\n");
    fclose(out);
}

static void clean_tracks(struct Tracks *tracks)
{
    int i;
    for (i = 0; i < tracks->nb_tracks; i++) {
        av_freep(&tracks->tracks[i]->codec_private);
        av_freep(&tracks->tracks[i]->offsets);
        av_freep(&tracks->tracks[i]);
    }
    av_freep(&tracks->tracks);
    tracks->nb_tracks = 0;
}

int main(int argc, char **argv)
{
    const char *basename = NULL;
    const char *path_prefix = "", *ismc_prefix = "";
    const char *output_prefix = "";
    char output_prefix_buf[2048];
    int split = 0, ismf = 0, i;
    struct Tracks tracks = { 0, .video_track = -1, .audio_track = -1 };

    for (i = 1; i < argc; i++) {
        if (!strcmp(argv[i], "-n")) {
            basename = argv[i + 1];
            i++;
        } else if (!strcmp(argv[i], "-path-prefix")) {
            path_prefix = argv[i + 1];
            i++;
        } else if (!strcmp(argv[i], "-ismc-prefix")) {
            ismc_prefix = argv[i + 1];
            i++;
        } else if (!strcmp(argv[i], "-output")) {
            output_prefix = argv[i + 1];
            i++;
            if (output_prefix[strlen(output_prefix) - 1] != '/') {
                snprintf(output_prefix_buf, sizeof(output_prefix_buf),
                         "%s/", output_prefix);
                output_prefix = output_prefix_buf;
            }
        } else if (!strcmp(argv[i], "-split")) {
            split = 1;
        } else if (!strcmp(argv[i], "-ismf")) {
            ismf = 1;
        } else if (argv[i][0] == '-') {
            return usage(argv[0], 1);
        } else {
            if (!basename)
                ismf = 0;
            if (handle_file(&tracks, argv[i], split, ismf,
                            basename, output_prefix))
                return 1;
        }
    }
    if (!tracks.nb_tracks || (!basename && !split))
        return usage(argv[0], 1);

    if (!split)
        output_server_manifest(&tracks, basename, output_prefix,
                               path_prefix, ismc_prefix);
    output_client_manifest(&tracks, basename, output_prefix, split);

    clean_tracks(&tracks);

    return 0;
}