GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mxpegdec.c Lines: 133 179 74.3 %
Date: 2021-04-20 04:37:23 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
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 * 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.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * 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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 *
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 * 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
        return AVERROR(ENOMEM);
72
73
2
    s->jpg.picture_ptr      = s->picture[0];
74
2
    return ff_mjpeg_decode_init(avctx);
75
}
76
77
31
static int mxpeg_decode_app(MXpegDecodeContext *s,
78
                            const uint8_t *buf_ptr, int buf_size)
79
{
80
    int len;
81
31
    if (buf_size < 2)
82
        return 0;
83
31
    len = AV_RB16(buf_ptr);
84
31
    skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
85
86
31
    return 0;
87
}
88
89
31
static int mxpeg_decode_mxm(MXpegDecodeContext *s,
90
                            const uint8_t *buf_ptr, int buf_size)
91
{
92
    unsigned bitmask_size, mb_count;
93
    int i;
94
95
31
    s->mb_width  = AV_RL16(buf_ptr+4);
96
31
    s->mb_height = AV_RL16(buf_ptr+6);
97
31
    mb_count = s->mb_width * s->mb_height;
98
99
31
    bitmask_size = (mb_count + 7) >> 3;
100
31
    if (bitmask_size > buf_size - 12) {
101
        av_log(s->jpg.avctx, AV_LOG_ERROR,
102
               "MXM bitmask is not complete\n");
103
        return AVERROR(EINVAL);
104
    }
105
106
31
    if (s->bitmask_size != bitmask_size) {
107
2
        s->bitmask_size = 0;
108
2
        av_freep(&s->mxm_bitmask);
109
2
        s->mxm_bitmask = av_malloc(bitmask_size);
110
2
        if (!s->mxm_bitmask) {
111
            av_log(s->jpg.avctx, AV_LOG_ERROR,
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                   "MXM bitmask memory allocation error\n");
113
            return AVERROR(ENOMEM);
114
        }
115
116
2
        av_freep(&s->completion_bitmask);
117
2
        s->completion_bitmask = av_mallocz(bitmask_size);
118
2
        if (!s->completion_bitmask) {
119
            av_log(s->jpg.avctx, AV_LOG_ERROR,
120
                   "Completion bitmask memory allocation error\n");
121
            return AVERROR(ENOMEM);
122
        }
123
124
2
        s->bitmask_size = bitmask_size;
125
    }
126
127
31
    memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size);
128
31
    s->got_mxm_bitmask = 1;
129
130
31
    if (!s->has_complete_frame) {
131
2
        uint8_t completion_check = 0xFF;
132
1202
        for (i = 0; i < bitmask_size; ++i) {
133
1200
            s->completion_bitmask[i] |= s->mxm_bitmask[i];
134
1200
            completion_check &= s->completion_bitmask[i];
135
        }
136
2
        s->has_complete_frame = !(completion_check ^ 0xFF);
137
    }
138
139
31
    return 0;
140
}
141
142
64
static int mxpeg_decode_com(MXpegDecodeContext *s,
143
                            const uint8_t *buf_ptr, int buf_size)
144
{
145
64
    int len, ret = 0;
146
64
    if (buf_size < 2)
147
        return 0;
148
64
    len = AV_RB16(buf_ptr);
149

64
    if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) {
150
31
        ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2);
151
    }
152
64
    skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
153
154
64
    return ret;
155
}
156
157
31
static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg,
158
                                  AVFrame *reference_ptr)
159
{
160
31
    if ((jpg->width + 0x0F)>>4 != s->mb_width ||
161
31
        (jpg->height + 0x0F)>>4 != s->mb_height) {
162
        av_log(jpg->avctx, AV_LOG_ERROR,
163
               "Picture dimensions stored in SOF and MXM mismatch\n");
164
        return AVERROR(EINVAL);
165
    }
166
167
31
    if (reference_ptr->data[0]) {
168
        int i;
169
145
        for (i = 0; i < MAX_COMPONENTS; ++i) {
170
116
            if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
171
116
                 reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) {
172
                av_log(jpg->avctx, AV_LOG_ERROR,
173
                       "Dimensions of current and reference picture mismatch\n");
174
                return AVERROR(EINVAL);
175
            }
176
        }
177
    }
178
179
31
    return 0;
180
}
181
182
31
static int mxpeg_decode_frame(AVCodecContext *avctx,
183
                          void *data, int *got_frame,
184
                          AVPacket *avpkt)
185
{
186
31
    const uint8_t *buf = avpkt->data;
187
31
    int buf_size = avpkt->size;
188
31
    MXpegDecodeContext *s = avctx->priv_data;
189
31
    MJpegDecodeContext *jpg = &s->jpg;
190
    const uint8_t *buf_end, *buf_ptr;
191
    const uint8_t *unescaped_buf_ptr;
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    int unescaped_buf_size;
193
    int start_code;
194
    int ret;
195
196
31
    buf_ptr = buf;
197
31
    buf_end = buf + buf_size;
198
31
    jpg->got_picture = 0;
199
31
    s->got_mxm_bitmask = 0;
200
31
    s->got_sof_data = !!s->got_sof_data;
201
202
    while (buf_ptr < buf_end) {
202
202
        start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
203
                                          &unescaped_buf_ptr, &unescaped_buf_size);
204
202
        if (start_code < 0)
205
            goto the_end;
206
        {
207
202
            init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);
208
209

202
            if (start_code >= APP0 && start_code <= APP15) {
210
31
                mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
211
            }
212
213


202
            switch (start_code) {
214
31
            case SOI:
215
31
                if (jpg->got_picture) //emulating EOI
216
                    goto the_end;
217
31
                break;
218
31
            case EOI:
219
31
                goto the_end;
220
4
            case DQT:
221
4
                ret = ff_mjpeg_decode_dqt(jpg);
222
4
                if (ret < 0) {
223
                    av_log(avctx, AV_LOG_ERROR,
224
                           "quantization table decode error\n");
225
                    return ret;
226
                }
227
4
                break;
228
8
            case DHT:
229
8
                ret = ff_mjpeg_decode_dht(jpg);
230
8
                if (ret < 0) {
231
                    av_log(avctx, AV_LOG_ERROR,
232
                           "huffman table decode error\n");
233
                    return ret;
234
                }
235
8
                break;
236
64
            case COM:
237
64
                ret = mxpeg_decode_com(s, unescaped_buf_ptr,
238
                                       unescaped_buf_size);
239
64
                if (ret < 0)
240
                    return ret;
241
64
                break;
242
2
            case SOF0:
243
2
                if (s->got_sof_data > 1) {
244
                    av_log(avctx, AV_LOG_ERROR,
245
                           "Multiple SOF in a frame\n");
246
                    return AVERROR_INVALIDDATA;
247
                }
248
2
                ret = ff_mjpeg_decode_sof(jpg);
249
2
                if (ret < 0) {
250
                    av_log(avctx, AV_LOG_ERROR,
251
                           "SOF data decode error\n");
252
                    s->got_sof_data = 0;
253
                    return ret;
254
                }
255
2
                if (jpg->interlaced) {
256
                    av_log(avctx, AV_LOG_ERROR,
257
                           "Interlaced mode not supported in MxPEG\n");
258
                    s->got_sof_data = 0;
259
                    return AVERROR(EINVAL);
260
                }
261
2
                s->got_sof_data ++;
262
2
                break;
263
31
            case SOS:
264
31
                if (!s->got_sof_data) {
265
                    av_log(avctx, AV_LOG_WARNING,
266
                           "Can not process SOS without SOF data, skipping\n");
267
                    break;
268
                }
269
31
                if (!jpg->got_picture) {
270
29
                    if (jpg->first_picture) {
271
                        av_log(avctx, AV_LOG_WARNING,
272
                               "First picture has no SOF, skipping\n");
273
                        break;
274
                    }
275
29
                    if (!s->got_mxm_bitmask){
276
                        av_log(avctx, AV_LOG_WARNING,
277
                               "Non-key frame has no MXM, skipping\n");
278
                        break;
279
                    }
280
                    /* use stored SOF data to allocate current picture */
281
29
                    av_frame_unref(jpg->picture_ptr);
282
29
                    if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
283
                                             AV_GET_BUFFER_FLAG_REF)) < 0)
284
                        return ret;
285
29
                    jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
286
29
                    jpg->picture_ptr->key_frame = 0;
287
29
                    jpg->got_picture = 1;
288
                } else {
289
2
                    jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
290
2
                    jpg->picture_ptr->key_frame = 1;
291
                }
292
293
31
                if (s->got_mxm_bitmask) {
294
31
                    AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
295
31
                    if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
296
                        break;
297
298
                    /* allocate dummy reference picture if needed */
299

33
                    if (!reference_ptr->data[0] &&
300
2
                        (ret = ff_get_buffer(avctx, reference_ptr,
301
                                             AV_GET_BUFFER_FLAG_REF)) < 0)
302
                        return ret;
303
304
31
                    ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
305

31
                    if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
306
                        return ret;
307
                } else {
308
                    ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
309
                    if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
310
                        return ret;
311
                }
312
313
31
                break;
314
            }
315
316
171
            buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
317
        }
318
319
    }
320
321
the_end:
322
31
    if (jpg->got_picture) {
323
31
        int ret = av_frame_ref(data, jpg->picture_ptr);
324
31
        if (ret < 0)
325
            return ret;
326
31
        *got_frame = 1;
327
328
31
        s->picture_index ^= 1;
329
31
        jpg->picture_ptr = s->picture[s->picture_index];
330
331
31
        if (!s->has_complete_frame) {
332
            if (!s->got_mxm_bitmask)
333
                s->has_complete_frame = 1;
334
            else
335
                *got_frame = 0;
336
        }
337
    }
338
339
31
    return buf_ptr - buf;
340
}
341
342
AVCodec ff_mxpeg_decoder = {
343
    .name           = "mxpeg",
344
    .long_name      = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"),
345
    .type           = AVMEDIA_TYPE_VIDEO,
346
    .id             = AV_CODEC_ID_MXPEG,
347
    .priv_data_size = sizeof(MXpegDecodeContext),
348
    .init           = mxpeg_decode_init,
349
    .close          = mxpeg_decode_end,
350
    .decode         = mxpeg_decode_frame,
351
    .capabilities   = AV_CODEC_CAP_DR1,
352
    .max_lowres     = 3,
353
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
354
};