GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mxpegdec.c Lines: 134 179 74.9 %
Date: 2020-04-04 00:26:16 Branches: 63 104 60.6 %

Line Branch Exec Source
1
/*
2
 * MxPEG decoder
3
 * Copyright (c) 2011 Anatoly Nenashev
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
17
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
23
/**
24
 * @file
25
 * MxPEG decoder
26
 */
27
28
#include "internal.h"
29
#include "mjpeg.h"
30
#include "mjpegdec.h"
31
32
typedef struct MXpegDecodeContext {
33
    MJpegDecodeContext jpg;
34
    AVFrame *picture[2]; /* pictures array */
35
    int picture_index; /* index of current picture */
36
    int got_sof_data; /* true if SOF data successfully parsed */
37
    int got_mxm_bitmask; /* true if MXM bitmask available */
38
    uint8_t *mxm_bitmask; /* bitmask buffer */
39
    unsigned bitmask_size; /* size of bitmask */
40
    int has_complete_frame; /* true if has complete frame */
41
    uint8_t *completion_bitmask; /* completion bitmask of macroblocks */
42
    unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */
43
} MXpegDecodeContext;
44
45
2
static av_cold int mxpeg_decode_end(AVCodecContext *avctx)
46
{
47
2
    MXpegDecodeContext *s = avctx->priv_data;
48
2
    MJpegDecodeContext *jpg = &s->jpg;
49
    int i;
50
51
2
    jpg->picture_ptr = NULL;
52
2
    ff_mjpeg_decode_end(avctx);
53
54
6
    for (i = 0; i < 2; ++i)
55
4
        av_frame_free(&s->picture[i]);
56
57
2
    s->bitmask_size = 0;
58
2
    av_freep(&s->mxm_bitmask);
59
2
    av_freep(&s->completion_bitmask);
60
61
2
    return 0;
62
}
63
64
2
static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
65
{
66
2
    MXpegDecodeContext *s = avctx->priv_data;
67
68
2
    s->picture[0] = av_frame_alloc();
69
2
    s->picture[1] = av_frame_alloc();
70

2
    if (!s->picture[0] || !s->picture[1]) {
71
        mxpeg_decode_end(avctx);
72
        return AVERROR(ENOMEM);
73
    }
74
75
2
    s->jpg.picture_ptr      = s->picture[0];
76
2
    return ff_mjpeg_decode_init(avctx);
77
}
78
79
31
static int mxpeg_decode_app(MXpegDecodeContext *s,
80
                            const uint8_t *buf_ptr, int buf_size)
81
{
82
    int len;
83
31
    if (buf_size < 2)
84
        return 0;
85
31
    len = AV_RB16(buf_ptr);
86
31
    skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
87
88
31
    return 0;
89
}
90
91
31
static int mxpeg_decode_mxm(MXpegDecodeContext *s,
92
                            const uint8_t *buf_ptr, int buf_size)
93
{
94
    unsigned bitmask_size, mb_count;
95
    int i;
96
97
31
    s->mb_width  = AV_RL16(buf_ptr+4);
98
31
    s->mb_height = AV_RL16(buf_ptr+6);
99
31
    mb_count = s->mb_width * s->mb_height;
100
101
31
    bitmask_size = (mb_count + 7) >> 3;
102
31
    if (bitmask_size > buf_size - 12) {
103
        av_log(s->jpg.avctx, AV_LOG_ERROR,
104
               "MXM bitmask is not complete\n");
105
        return AVERROR(EINVAL);
106
    }
107
108
31
    if (s->bitmask_size != bitmask_size) {
109
2
        s->bitmask_size = 0;
110
2
        av_freep(&s->mxm_bitmask);
111
2
        s->mxm_bitmask = av_malloc(bitmask_size);
112
2
        if (!s->mxm_bitmask) {
113
            av_log(s->jpg.avctx, AV_LOG_ERROR,
114
                   "MXM bitmask memory allocation error\n");
115
            return AVERROR(ENOMEM);
116
        }
117
118
2
        av_freep(&s->completion_bitmask);
119
2
        s->completion_bitmask = av_mallocz(bitmask_size);
120
2
        if (!s->completion_bitmask) {
121
            av_log(s->jpg.avctx, AV_LOG_ERROR,
122
                   "Completion bitmask memory allocation error\n");
123
            return AVERROR(ENOMEM);
124
        }
125
126
2
        s->bitmask_size = bitmask_size;
127
    }
128
129
31
    memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size);
130
31
    s->got_mxm_bitmask = 1;
131
132
31
    if (!s->has_complete_frame) {
133
2
        uint8_t completion_check = 0xFF;
134
1202
        for (i = 0; i < bitmask_size; ++i) {
135
1200
            s->completion_bitmask[i] |= s->mxm_bitmask[i];
136
1200
            completion_check &= s->completion_bitmask[i];
137
        }
138
2
        s->has_complete_frame = !(completion_check ^ 0xFF);
139
    }
140
141
31
    return 0;
142
}
143
144
64
static int mxpeg_decode_com(MXpegDecodeContext *s,
145
                            const uint8_t *buf_ptr, int buf_size)
146
{
147
64
    int len, ret = 0;
148
64
    if (buf_size < 2)
149
        return 0;
150
64
    len = AV_RB16(buf_ptr);
151

64
    if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) {
152
31
        ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2);
153
    }
154
64
    skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
155
156
64
    return ret;
157
}
158
159
31
static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg,
160
                                  AVFrame *reference_ptr)
161
{
162
31
    if ((jpg->width + 0x0F)>>4 != s->mb_width ||
163
31
        (jpg->height + 0x0F)>>4 != s->mb_height) {
164
        av_log(jpg->avctx, AV_LOG_ERROR,
165
               "Picture dimensions stored in SOF and MXM mismatch\n");
166
        return AVERROR(EINVAL);
167
    }
168
169
31
    if (reference_ptr->data[0]) {
170
        int i;
171
145
        for (i = 0; i < MAX_COMPONENTS; ++i) {
172
116
            if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
173
116
                 reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) {
174
                av_log(jpg->avctx, AV_LOG_ERROR,
175
                       "Dimensions of current and reference picture mismatch\n");
176
                return AVERROR(EINVAL);
177
            }
178
        }
179
    }
180
181
31
    return 0;
182
}
183
184
31
static int mxpeg_decode_frame(AVCodecContext *avctx,
185
                          void *data, int *got_frame,
186
                          AVPacket *avpkt)
187
{
188
31
    const uint8_t *buf = avpkt->data;
189
31
    int buf_size = avpkt->size;
190
31
    MXpegDecodeContext *s = avctx->priv_data;
191
31
    MJpegDecodeContext *jpg = &s->jpg;
192
    const uint8_t *buf_end, *buf_ptr;
193
    const uint8_t *unescaped_buf_ptr;
194
    int unescaped_buf_size;
195
    int start_code;
196
    int ret;
197
198
31
    buf_ptr = buf;
199
31
    buf_end = buf + buf_size;
200
31
    jpg->got_picture = 0;
201
31
    s->got_mxm_bitmask = 0;
202
31
    s->got_sof_data = !!s->got_sof_data;
203
202
    while (buf_ptr < buf_end) {
204
202
        start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
205
                                          &unescaped_buf_ptr, &unescaped_buf_size);
206
202
        if (start_code < 0)
207
            goto the_end;
208
        {
209
202
            init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);
210
211

202
            if (start_code >= APP0 && start_code <= APP15) {
212
31
                mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
213
            }
214
215


202
            switch (start_code) {
216
31
            case SOI:
217
31
                if (jpg->got_picture) //emulating EOI
218
                    goto the_end;
219
31
                break;
220
31
            case EOI:
221
31
                goto the_end;
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4
            case DQT:
223
4
                ret = ff_mjpeg_decode_dqt(jpg);
224
4
                if (ret < 0) {
225
                    av_log(avctx, AV_LOG_ERROR,
226
                           "quantization table decode error\n");
227
                    return ret;
228
                }
229
4
                break;
230
8
            case DHT:
231
8
                ret = ff_mjpeg_decode_dht(jpg);
232
8
                if (ret < 0) {
233
                    av_log(avctx, AV_LOG_ERROR,
234
                           "huffman table decode error\n");
235
                    return ret;
236
                }
237
8
                break;
238
64
            case COM:
239
64
                ret = mxpeg_decode_com(s, unescaped_buf_ptr,
240
                                       unescaped_buf_size);
241
64
                if (ret < 0)
242
                    return ret;
243
64
                break;
244
2
            case SOF0:
245
2
                if (s->got_sof_data > 1) {
246
                    av_log(avctx, AV_LOG_ERROR,
247
                           "Multiple SOF in a frame\n");
248
                    return AVERROR_INVALIDDATA;
249
                }
250
2
                s->got_sof_data = 0;
251
2
                ret = ff_mjpeg_decode_sof(jpg);
252
2
                if (ret < 0) {
253
                    av_log(avctx, AV_LOG_ERROR,
254
                           "SOF data decode error\n");
255
                    return ret;
256
                }
257
2
                if (jpg->interlaced) {
258
                    av_log(avctx, AV_LOG_ERROR,
259
                           "Interlaced mode not supported in MxPEG\n");
260
                    return AVERROR(EINVAL);
261
                }
262
2
                s->got_sof_data ++;
263
2
                break;
264
31
            case SOS:
265
31
                if (!s->got_sof_data) {
266
                    av_log(avctx, AV_LOG_WARNING,
267
                           "Can not process SOS without SOF data, skipping\n");
268
                    break;
269
                }
270
31
                if (!jpg->got_picture) {
271
29
                    if (jpg->first_picture) {
272
                        av_log(avctx, AV_LOG_WARNING,
273
                               "First picture has no SOF, skipping\n");
274
                        break;
275
                    }
276
29
                    if (!s->got_mxm_bitmask){
277
                        av_log(avctx, AV_LOG_WARNING,
278
                               "Non-key frame has no MXM, skipping\n");
279
                        break;
280
                    }
281
                    /* use stored SOF data to allocate current picture */
282
29
                    av_frame_unref(jpg->picture_ptr);
283
29
                    if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
284
                                             AV_GET_BUFFER_FLAG_REF)) < 0)
285
                        return ret;
286
29
                    jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
287
29
                    jpg->picture_ptr->key_frame = 0;
288
29
                    jpg->got_picture = 1;
289
                } else {
290
2
                    jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
291
2
                    jpg->picture_ptr->key_frame = 1;
292
                }
293
294
31
                if (s->got_mxm_bitmask) {
295
31
                    AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
296
31
                    if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
297
                        break;
298
299
                    /* allocate dummy reference picture if needed */
300

33
                    if (!reference_ptr->data[0] &&
301
2
                        (ret = ff_get_buffer(avctx, reference_ptr,
302
                                             AV_GET_BUFFER_FLAG_REF)) < 0)
303
                        return ret;
304
305
31
                    ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
306

31
                    if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
307
                        return ret;
308
                } else {
309
                    ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
310
                    if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
311
                        return ret;
312
                }
313
314
31
                break;
315
            }
316
317
171
            buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
318
        }
319
320
    }
321
322
the_end:
323
31
    if (jpg->got_picture) {
324
31
        int ret = av_frame_ref(data, jpg->picture_ptr);
325
31
        if (ret < 0)
326
            return ret;
327
31
        *got_frame = 1;
328
329
31
        s->picture_index ^= 1;
330
31
        jpg->picture_ptr = s->picture[s->picture_index];
331
332
31
        if (!s->has_complete_frame) {
333
            if (!s->got_mxm_bitmask)
334
                s->has_complete_frame = 1;
335
            else
336
                *got_frame = 0;
337
        }
338
    }
339
340
31
    return buf_ptr - buf;
341
}
342
343
AVCodec ff_mxpeg_decoder = {
344
    .name           = "mxpeg",
345
    .long_name      = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"),
346
    .type           = AVMEDIA_TYPE_VIDEO,
347
    .id             = AV_CODEC_ID_MXPEG,
348
    .priv_data_size = sizeof(MXpegDecodeContext),
349
    .init           = mxpeg_decode_init,
350
    .close          = mxpeg_decode_end,
351
    .decode         = mxpeg_decode_frame,
352
    .capabilities   = AV_CODEC_CAP_DR1,
353
    .max_lowres     = 3,
354
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
355
};