summaryrefslogtreecommitdiff
path: root/libavformat/mlvdec.c
blob: a980ed6218cd938ddc2af29d5effc835240aa019 (plain)
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
/*
 * Magic Lantern Video (MLV) demuxer
 * Copyright (c) 2014 Peter Ross
 *
 * 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
 */

/**
 * @file
 * Magic Lantern Video (MLV) demuxer
 */

#include "libavutil/eval.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/rational.h"
#include "avformat.h"
#include "internal.h"
#include "riff.h"

#define MLV_VERSION "v2.0"

#define MLV_VIDEO_CLASS_RAW  1
#define MLV_VIDEO_CLASS_YUV  2
#define MLV_VIDEO_CLASS_JPEG 3
#define MLV_VIDEO_CLASS_H264 4

#define MLV_AUDIO_CLASS_WAV  1

#define MLV_CLASS_FLAG_DELTA 0x40
#define MLV_CLASS_FLAG_LZMA  0x80

typedef struct {
    AVIOContext *pb[101];
    int class[2];
    int stream_index;
    uint64_t pts;
} MlvContext;

static int probe(AVProbeData *p)
{
    if (AV_RL32(p->buf) == MKTAG('M','L','V','I') &&
        AV_RL32(p->buf + 4) >= 52 &&
        !memcmp(p->buf + 8, MLV_VERSION, 5))
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int check_file_header(AVIOContext *pb, uint64_t guid)
{
    unsigned int size;
    uint8_t version[8];

    avio_skip(pb, 4);
    size = avio_rl32(pb);
    if (size < 52)
        return AVERROR_INVALIDDATA;
    avio_read(pb, version, 8);
    if (memcmp(version, MLV_VERSION, 5) || avio_rl64(pb) != guid)
        return AVERROR_INVALIDDATA;
    avio_skip(pb, size - 24);
    return 0;
}

static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, int size)
{
    char * value = av_malloc(size + 1);
    if (!value) {
        avio_skip(pb, size);
        return;
    }

    avio_read(pb, value, size);
    if (!value[0]) {
        av_free(value);
        return;
    }

    value[size] = 0;
    av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
}

static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
    char value[4];
    snprintf(value, sizeof(value), "%i", avio_r8(pb));
    av_dict_set(&avctx->metadata, tag, value, 0);
}

static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
    char value[8];
    snprintf(value, sizeof(value), "%i", avio_rl16(pb));
    av_dict_set(&avctx->metadata, tag, value, 0);
}

static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
    char value[16];
    snprintf(value, sizeof(value), fmt, avio_rl32(pb));
    av_dict_set(&avctx->metadata, tag, value, 0);
}

static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
    char value[32];
    snprintf(value, sizeof(value), fmt, avio_rl64(pb));
    av_dict_set(&avctx->metadata, tag, value, 0);
}

static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
{
    MlvContext *mlv = avctx->priv_data;
    AVIOContext *pb = mlv->pb[file];
    int ret;
    while (!url_feof(pb)) {
        int type;
        unsigned int size;
        type = avio_rl32(pb);
        size = avio_rl32(pb);
        avio_skip(pb, 8); //timestamp
        if (size < 16)
            break;
        size -= 16;
        if (vst && type == MKTAG('R','A','W','I') && size >= 164) {
            vst->codec->width  = avio_rl16(pb);
            vst->codec->height = avio_rl16(pb);
            if (avio_rl32(pb) != 1)
                avpriv_request_sample(avctx, "raw api version");
            avio_skip(pb, 20); // pointer, width, height, pitch, frame_size
            vst->codec->bits_per_coded_sample = avio_rl32(pb);
            avio_skip(pb, 8 + 16 + 24); // black_level, white_level, xywh, active_area, exposure_bias
            if (avio_rl32(pb) != 0x2010100) /* RGGB */
                avpriv_request_sample(avctx, "cfa_pattern");
            avio_skip(pb, 80); // calibration_illuminant1, color_matrix1, dynamic_range
            vst->codec->pix_fmt  = AV_PIX_FMT_BAYER_RGGB16LE;
            vst->codec->codec_tag = MKTAG('B', 'I', 'T', 16);
            size -= 164;
        } else if (ast && type == MKTAG('W', 'A', 'V', 'I') && size >= 16) {
            ret = ff_get_wav_header(pb, ast->codec, 16);
            if (ret < 0)
                return ret;
            size -= 16;
        } else if (type == MKTAG('I','N','F','O')) {
            if (size > 0)
                read_string(avctx, pb, "info", size);
            continue;
        } else if (type == MKTAG('I','D','N','T') && size >= 36) {
            read_string(avctx, pb, "cameraName", 32);
            read_uint32(avctx, pb, "cameraModel", "0x%"PRIx32);
            size -= 36;
            if (size >= 32) {
                read_string(avctx, pb, "cameraSerial", 32);
                size -= 32;
            }
        } else if (type == MKTAG('L','E','N','S') && size >= 48) {
            read_uint16(avctx, pb, "focalLength", "%i");
            read_uint16(avctx, pb, "focalDist", "%i");
            read_uint16(avctx, pb, "aperture", "%i");
            read_uint8(avctx, pb, "stabilizerMode", "%i");
            read_uint8(avctx, pb, "autofocusMode", "%i");
            read_uint32(avctx, pb, "flags", "0x%"PRIx32);
            read_uint32(avctx, pb, "lensID", "%"PRIi32);
            read_string(avctx, pb, "lensName", 32);
            size -= 48;
            if (size >= 32) {
                read_string(avctx, pb, "lensSerial", 32);
                size -= 32;
            }
        } else if (vst && type == MKTAG('V', 'I', 'D', 'F') && size >= 4) {
            uint64_t pts = avio_rl32(pb);
            ff_add_index_entry(&vst->index_entries, &vst->nb_index_entries, &vst->index_entries_allocated_size,
                               avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
            size -= 4;
        } else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
            uint64_t pts = avio_rl32(pb);
            ff_add_index_entry(&ast->index_entries, &ast->nb_index_entries, &ast->index_entries_allocated_size,
                               avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
            size -= 4;
        } else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
            read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
            read_uint32(avctx, pb, "kelvin", "%"PRIi32);
            read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
            read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
            read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
            read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
            read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
            size -= 28;
        } else if (type == MKTAG('R','T','C','I') && size >= 20) {
            char str[32];
            struct tm time = { 0 };
            time.tm_sec    = avio_rl16(pb);
            time.tm_min    = avio_rl16(pb);
            time.tm_hour   = avio_rl16(pb);
            time.tm_mday   = avio_rl16(pb);
            time.tm_mon    = avio_rl16(pb);
            time.tm_year   = avio_rl16(pb);
            time.tm_wday   = avio_rl16(pb);
            time.tm_yday   = avio_rl16(pb);
            time.tm_isdst  = avio_rl16(pb);
            avio_skip(pb, 2);
            strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time);
            av_dict_set(&avctx->metadata, "time", str, 0);
            size -= 20;
        } else if (type == MKTAG('E','X','P','O') && size >= 16) {
            av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
            read_uint32(avctx, pb, "isoValue", "%"PRIi32);
            read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
            read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
            size -= 16;
            if (size >= 8) {
                read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
                size -= 8;
            }
        } else if (type == MKTAG('S','T','Y','L') && size >= 36) {
            read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
            read_uint32(avctx, pb, "contrast", "%"PRIi32);
            read_uint32(avctx, pb, "sharpness", "%"PRIi32);
            read_uint32(avctx, pb, "saturation", "%"PRIi32);
            read_uint32(avctx, pb, "colortone", "%"PRIi32);
            read_string(avctx, pb, "picStyleName", 16);
            size -= 36;
        } else if (type == MKTAG('M','A','R','K')) {
        } else if (type == MKTAG('N','U','L','L')) {
        } else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
        } else {
            av_log(avctx, AV_LOG_INFO, "unsupported tag %c%c%c%c, size %u\n", type&0xFF, (type>>8)&0xFF, (type>>16)&0xFF, (type>>24)&0xFF, size);
        }
        avio_skip(pb, size);
    }
    return 0;
}

static int read_header(AVFormatContext *avctx)
{
    MlvContext *mlv = avctx->priv_data;
    AVIOContext *pb = avctx->pb;
    AVStream *vst = NULL, *ast = NULL;
    int size, ret;
    uint64_t guid;
    char guidstr[32];

    avio_skip(pb, 4);
    size = avio_rl32(pb);
    if (size < 52)
        return AVERROR_INVALIDDATA;

    avio_skip(pb, 8);

    guid = avio_rl64(pb);
    snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
    av_dict_set(&avctx->metadata, "guid", guidstr, 0);

    avio_skip(pb, 8); //fileNum, fileCount, fileFlags

    mlv->class[0] = avio_rl16(pb);
    if (mlv->class[0]) {
        vst = avformat_new_stream(avctx, NULL);
        if (!vst)
            return AVERROR(ENOMEM);
        vst->id = 0;
        if ((mlv->class[0] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)))
            avpriv_request_sample(avctx, "compression");
        vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
        switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
        case MLV_VIDEO_CLASS_RAW:
            vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
            break;
        case MLV_VIDEO_CLASS_YUV:
            vst->codec->pix_fmt  = AV_PIX_FMT_YUV420P;
            vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
            vst->codec->codec_tag = 0;
            break;
        case MLV_VIDEO_CLASS_JPEG:
            vst->codec->codec_id = AV_CODEC_ID_MJPEG;
            vst->codec->codec_tag = 0;
            break;
        case MLV_VIDEO_CLASS_H264:
            vst->codec->codec_id = AV_CODEC_ID_H264;
            vst->codec->codec_tag = 0;
            break;
        default:
            avpriv_request_sample(avctx, "unknown video class");
        }
    }

    mlv->class[1] = avio_rl16(pb);
    if (mlv->class[1]) {
        ast = avformat_new_stream(avctx, NULL);
        if (!ast)
            return AVERROR(ENOMEM);
        ast->id = 1;
        if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
            avpriv_request_sample(avctx, "compression");
        if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
            avpriv_request_sample(avctx, "unknown audio class");

        ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
        avpriv_set_pts_info(ast, 33, 1, ast->codec->sample_rate);
    }

    if (vst)
       vst->nb_frames = avio_rl32(pb);
    else
       avio_skip(pb, 4);

    if (ast)
       ast->nb_frames = avio_rl32(pb);
    else
       avio_skip(pb, 4);

    if (vst) {
       AVRational framerate;
       framerate.num = avio_rl32(pb);
       framerate.den = avio_rl32(pb);
       avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
    } else
       avio_skip(pb, 8);

    avio_skip(pb, size - 52);

    /* scan primary file */
    mlv->pb[100] = avctx->pb;
    ret = scan_file(avctx, vst, ast, 100);
    if (ret < 0)
        return ret;

    /* scan secondary files */
    if (strlen(avctx->filename) > 2) {
        int i;
        char *filename = av_strdup(avctx->filename);
        if (!filename)
            return AVERROR(ENOMEM);
        for (i = 0; i < 100; i++) {
            snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
            if (avio_open2(&mlv->pb[i], filename, AVIO_FLAG_READ, &avctx->interrupt_callback, NULL) < 0)
                break;
            if (check_file_header(mlv->pb[i], guid) < 0) {
                av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
                avio_close(mlv->pb[i]);
                mlv->pb[i] = NULL;
                continue;
            }
            av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
            ret = scan_file(avctx, vst, ast, i);
            if (ret < 0) {
                av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
                avio_close(mlv->pb[i]);
                mlv->pb[i] = NULL;
                continue;
            }
        }
        av_free(filename);
    }

    if (vst)
        vst->duration = vst->nb_index_entries;
    if (ast)
        ast->duration = ast->nb_index_entries;

    if (vst && ast)
        avio_seek(pb, FFMIN(vst->index_entries[0].pos, ast->index_entries[0].pos), SEEK_SET);
    else if (vst)
        avio_seek(pb, vst->index_entries[0].pos, SEEK_SET);
    else if (ast)
        avio_seek(pb, ast->index_entries[0].pos, SEEK_SET);

    return 0;
}

static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
{
    MlvContext *mlv = avctx->priv_data;
    AVIOContext *pb;
    AVStream *st = avctx->streams[mlv->stream_index];
    int index, ret;
    unsigned int size, space;

    if (mlv->pts >= st->duration)
        return AVERROR_EOF;

    index = av_index_search_timestamp(st, mlv->pts, AVSEEK_FLAG_ANY);
    if (index < 0) {
        av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
        return AVERROR(EIO);
    }

    pb = mlv->pb[st->index_entries[index].size];
    avio_seek(pb, st->index_entries[index].pos, SEEK_SET);

    avio_skip(pb, 4); // blockType
    size = avio_rl32(pb);
    if (size < 16)
        return AVERROR_INVALIDDATA;
    avio_skip(pb, 12); //timestamp, frameNumber
    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
        avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
    space = avio_rl32(pb);
    avio_skip(pb, space);

    if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
        ret = AVERROR_PATCHWELCOME;
    } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
        ret = av_get_packet(pb, pkt, (st->codec->width * st->codec->height * st->codec->bits_per_coded_sample + 7) >> 3);
    } else { // AVMEDIA_TYPE_AUDIO
        if (space > UINT_MAX - 24 || size < (24 + space))
            return AVERROR_INVALIDDATA;
        ret = av_get_packet(pb, pkt, size - (24 + space));
    }

    if (ret < 0)
        return ret;

    pkt->stream_index = mlv->stream_index;
    pkt->pts = mlv->pts;

    mlv->stream_index++;
    if (mlv->stream_index == avctx->nb_streams) {
        mlv->stream_index = 0;
        mlv->pts++;
    }
    return 0;
}

static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
{
    MlvContext *mlv = avctx->priv_data;

    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
        return AVERROR(ENOSYS);

    if (!avctx->pb->seekable)
        return AVERROR(EIO);

    mlv->pts = timestamp;
    return 0;
}

static int read_close(AVFormatContext *s)
{
    MlvContext *mlv = s->priv_data;
    int i;
    for (i = 0; i < 100; i++)
        if (mlv->pb[i])
            avio_close(mlv->pb[i]);
    return 0;
}

AVInputFormat ff_mlv_demuxer = {
    .name           = "mlv",
    .long_name      = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
    .priv_data_size = sizeof(MlvContext),
    .read_probe     = probe,
    .read_header    = read_header,
    .read_packet    = read_packet,
    .read_close     = read_close,
    .read_seek      = read_seek,
};