FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mxpegdec.c
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 133 179 74.3%
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
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 "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
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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
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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
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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
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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
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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
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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
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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
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31 if (!s->has_complete_frame) {
131 2 uint8_t completion_check = 0xFF;
132
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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
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64 if (buf_size < 2)
147 return 0;
148 64 len = AV_RB16(buf_ptr);
149
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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
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31 if ((jpg->width + 0x0F)>>4 != s->mb_width ||
161
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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
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31 if (reference_ptr->data[0]) {
168 int i;
169
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145 for (i = 0; i < MAX_COMPONENTS; ++i) {
170
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116 if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
171
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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;
192 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
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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
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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
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202 if (start_code >= APP0 && start_code <= APP15) {
210 31 mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
211 }
212
213
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202 switch (start_code) {
214 31 case SOI:
215
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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
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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
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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
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64 if (ret < 0)
240 return ret;
241 64 break;
242 2 case SOF0:
243
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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
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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
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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
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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
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31 if (!jpg->got_picture) {
270
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29 if (jpg->first_picture) {
271 av_log(avctx, AV_LOG_WARNING,
272 "First picture has no SOF, skipping\n");
273 break;
274 }
275
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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
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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
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31 if (s->got_mxm_bitmask) {
294 31 AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
295
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31 if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
296 break;
297
298 /* allocate dummy reference picture if needed */
299
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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
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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
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31 if (jpg->got_picture) {
323 31 int ret = av_frame_ref(data, jpg->picture_ptr);
324
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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
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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 const 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 };
355