FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mxpegdec.c
Date: 2025-04-25 22:50:00
Exec Total Coverage
Lines: 132 179 73.7%
Functions: 7 7 100.0%
Branches: 64 106 60.4%
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
10 * 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
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * 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 "libavutil/mem.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31 #include "mjpeg.h"
32 #include "mjpegdec.h"
33
34 typedef struct MXpegDecodeContext {
35 MJpegDecodeContext jpg;
36 AVFrame *picture[2]; /* pictures array */
37 int picture_index; /* index of current picture */
38 int got_sof_data; /* true if SOF data successfully parsed */
39 int got_mxm_bitmask; /* true if MXM bitmask available */
40 uint8_t *mxm_bitmask; /* bitmask buffer */
41 unsigned bitmask_size; /* size of bitmask */
42 int has_complete_frame; /* true if has complete frame */
43 uint8_t *completion_bitmask; /* completion bitmask of macroblocks */
44 unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */
45 } MXpegDecodeContext;
46
47 2 static av_cold int mxpeg_decode_end(AVCodecContext *avctx)
48 {
49 2 MXpegDecodeContext *s = avctx->priv_data;
50 int i;
51
52 2 ff_mjpeg_decode_end(avctx);
53
54
2/2
✓ Branch 0 taken 4 times.
✓ Branch 1 taken 2 times.
 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
2/4
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 2 times.
 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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 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
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 29 times.
 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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (!s->mxm_bitmask) {
111 ✗ av_log(s->jpg.avctx, AV_LOG_ERROR,
112 "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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 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
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 29 times.
 31 if (!s->has_complete_frame) {
131 2 uint8_t completion_check = 0xFF;
132
2/2
✓ Branch 0 taken 1200 times.
✓ Branch 1 taken 2 times.
 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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 64 times.
 64 if (buf_size < 2)
147 ✗ return 0;
148 64 len = AV_RB16(buf_ptr);
149
4/6
✓ Branch 0 taken 64 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 64 times.
✗ Branch 3 not taken.
✓ Branch 4 taken 31 times.
✓ Branch 5 taken 33 times.
 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
1/2
✓ Branch 0 taken 31 times.
✗ Branch 1 not taken.
 31 if ((jpg->width + 0x0F)>>4 != s->mb_width ||
161
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 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
2/2
✓ Branch 0 taken 29 times.
✓ Branch 1 taken 2 times.
 31 if (reference_ptr->data[0]) {
168 int i;
169
2/2
✓ Branch 0 taken 116 times.
✓ Branch 1 taken 29 times.
 145 for (i = 0; i < MAX_COMPONENTS; ++i) {
170
1/2
✓ Branch 0 taken 116 times.
✗ Branch 1 not taken.
 116 if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
171
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 116 times.
 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, AVFrame *rframe,
183 int *got_frame, AVPacket *avpkt)
184 {
185 31 const uint8_t *buf = avpkt->data;
186 31 int buf_size = avpkt->size;
187 31 MXpegDecodeContext *s = avctx->priv_data;
188 31 MJpegDecodeContext *jpg = &s->jpg;
189 const uint8_t *buf_end, *buf_ptr;
190 const uint8_t *unescaped_buf_ptr;
191 int unescaped_buf_size;
192 int start_code;
193 int ret;
194
195
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 31 if (avctx->skip_frame == AVDISCARD_ALL)
196 ✗ return AVERROR_PATCHWELCOME;
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
1/2
✓ Branch 0 taken 202 times.
✗ Branch 1 not taken.
 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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 202 times.
 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
4/4
✓ Branch 0 taken 95 times.
✓ Branch 1 taken 107 times.
✓ Branch 2 taken 31 times.
✓ Branch 3 taken 64 times.
 202 if (start_code >= APP0 && start_code <= APP15) {
212 31 mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
213 }
214
215
8/8
✓ Branch 0 taken 31 times.
✓ Branch 1 taken 31 times.
✓ Branch 2 taken 4 times.
✓ Branch 3 taken 8 times.
✓ Branch 4 taken 64 times.
✓ Branch 5 taken 2 times.
✓ Branch 6 taken 31 times.
✓ Branch 7 taken 31 times.
 202 switch (start_code) {
216 31 case SOI:
217
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 31 if (jpg->got_picture) //emulating EOI
218 ✗ goto the_end;
219 31 break;
220 31 case EOI:
221 31 goto the_end;
222 4 case DQT:
223 4 ret = ff_mjpeg_decode_dqt(jpg);
224
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4 times.
 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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 8 times.
 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
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 64 times.
 64 if (ret < 0)
242 ✗ return ret;
243 64 break;
244 2 case SOF0:
245
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 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 ret = ff_mjpeg_decode_sof(jpg);
251
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (ret < 0) {
252 ✗ av_log(avctx, AV_LOG_ERROR,
253 "SOF data decode error\n");
254 ✗ s->got_sof_data = 0;
255 ✗ return ret;
256 }
257
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (jpg->interlaced) {
258 ✗ av_log(avctx, AV_LOG_ERROR,
259 "Interlaced mode not supported in MxPEG\n");
260 ✗ s->got_sof_data = 0;
261 ✗ return AVERROR(EINVAL);
262 }
263 2 s->got_sof_data ++;
264 2 break;
265 31 case SOS:
266
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 31 if (!s->got_sof_data) {
267 ✗ av_log(avctx, AV_LOG_WARNING,
268 "Can not process SOS without SOF data, skipping\n");
269 ✗ break;
270 }
271
2/2
✓ Branch 0 taken 29 times.
✓ Branch 1 taken 2 times.
 31 if (!jpg->got_picture) {
272
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 29 times.
 29 if (jpg->first_picture) {
273 ✗ av_log(avctx, AV_LOG_WARNING,
274 "First picture has no SOF, skipping\n");
275 ✗ break;
276 }
277
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 29 times.
 29 if (!s->got_mxm_bitmask){
278 ✗ av_log(avctx, AV_LOG_WARNING,
279 "Non-key frame has no MXM, skipping\n");
280 ✗ break;
281 }
282 /* use stored SOF data to allocate current picture */
283 29 av_frame_unref(jpg->picture_ptr);
284
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 29 times.
 29 if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
285 AV_GET_BUFFER_FLAG_REF)) < 0)
286 ✗ return ret;
287 29 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
288 29 jpg->picture_ptr->flags &= ~AV_FRAME_FLAG_KEY;
289 29 jpg->got_picture = 1;
290 } else {
291 2 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
292 2 jpg->picture_ptr->flags |= AV_FRAME_FLAG_KEY;
293 }
294
295
1/2
✓ Branch 0 taken 31 times.
✗ Branch 1 not taken.
 31 if (s->got_mxm_bitmask) {
296 31 AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
297
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 31 times.
 31 if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
298 ✗ break;
299
300 /* allocate dummy reference picture if needed */
301
3/4
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 29 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2 times.
 33 if (!reference_ptr->data[0] &&
302 2 (ret = ff_get_buffer(avctx, reference_ptr,
303 AV_GET_BUFFER_FLAG_REF)) < 0)
304 ✗ return ret;
305
306 31 ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
307
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 31 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
308 ✗ return ret;
309 } else {
310 ✗ ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
311 ✗ if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
312 ✗ return ret;
313 }
314
315 31 break;
316 }
317
318 171 buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
319 }
320
321 }
322
323 ✗ the_end:
324
1/2
✓ Branch 0 taken 31 times.
✗ Branch 1 not taken.
 31 if (jpg->got_picture) {
325 31 int ret = av_frame_ref(rframe, jpg->picture_ptr);
326
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 31 if (ret < 0)
327 ✗ return ret;
328 31 *got_frame = 1;
329
330 31 s->picture_index ^= 1;
331 31 jpg->picture_ptr = s->picture[s->picture_index];
332
333
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 31 times.
 31 if (!s->has_complete_frame) {
334 ✗ if (!s->got_mxm_bitmask)
335 ✗ s->has_complete_frame = 1;
336 else
337 ✗ *got_frame = 0;
338 }
339 }
340
341 31 return buf_ptr - buf;
342 }
343
344 const FFCodec ff_mxpeg_decoder = {
345 .p.name = "mxpeg",
346 CODEC_LONG_NAME("Mobotix MxPEG video"),
347 .p.type = AVMEDIA_TYPE_VIDEO,
348 .p.id = AV_CODEC_ID_MXPEG,
349 .priv_data_size = sizeof(MXpegDecodeContext),
350 .init = mxpeg_decode_init,
351 .close = mxpeg_decode_end,
352 FF_CODEC_DECODE_CB(mxpeg_decode_frame),
353 .p.capabilities = AV_CODEC_CAP_DR1,
354 .p.max_lowres = 3,
355 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
356 };
357