FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mxpegdec.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 134 181 74.0%
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 2 MJpegDecodeContext *jpg = &s->jpg;
51 int i;
52
53 2 jpg->picture_ptr = NULL;
54 2 ff_mjpeg_decode_end(avctx);
55
56
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 6 for (i = 0; i < 2; ++i)
57 4 av_frame_free(&s->picture[i]);
58
59 2 s->bitmask_size = 0;
60 2 av_freep(&s->mxm_bitmask);
61 2 av_freep(&s->completion_bitmask);
62
63 2 return 0;
64 }
65
66 2 static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
67 {
68 2 MXpegDecodeContext *s = avctx->priv_data;
69
70 2 s->picture[0] = av_frame_alloc();
71 2 s->picture[1] = av_frame_alloc();
72
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 2 if (!s->picture[0] || !s->picture[1])
73 ✗ return AVERROR(ENOMEM);
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
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 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
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 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
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 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
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 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
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 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
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 31 if (!s->has_complete_frame) {
133 2 uint8_t completion_check = 0xFF;
134
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 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
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 64 if (buf_size < 2)
149 ✗ return 0;
150 64 len = AV_RB16(buf_ptr);
151
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 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
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 31 if ((jpg->width + 0x0F)>>4 != s->mb_width ||
163
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 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
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 31 if (reference_ptr->data[0]) {
170 int i;
171
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 145 for (i = 0; i < MAX_COMPONENTS; ++i) {
172
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 116 if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
173
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 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, AVFrame *rframe,
185 int *got_frame, AVPacket *avpkt)
186 {
187 31 const uint8_t *buf = avpkt->data;
188 31 int buf_size = avpkt->size;
189 31 MXpegDecodeContext *s = avctx->priv_data;
190 31 MJpegDecodeContext *jpg = &s->jpg;
191 const uint8_t *buf_end, *buf_ptr;
192 const uint8_t *unescaped_buf_ptr;
193 int unescaped_buf_size;
194 int start_code;
195 int ret;
196
197
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 31 if (avctx->skip_frame == AVDISCARD_ALL)
198 ✗ return AVERROR_PATCHWELCOME;
199
200 31 buf_ptr = buf;
201 31 buf_end = buf + buf_size;
202 31 jpg->got_picture = 0;
203 31 s->got_mxm_bitmask = 0;
204 31 s->got_sof_data = !!s->got_sof_data;
205
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 202 while (buf_ptr < buf_end) {
206 202 start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
207 &unescaped_buf_ptr, &unescaped_buf_size);
208
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 202 if (start_code < 0)
209 ✗ goto the_end;
210 {
211 202 init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);
212
213
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 202 if (start_code >= APP0 && start_code <= APP15) {
214 31 mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
215 }
216
217
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 202 switch (start_code) {
218 31 case SOI:
219
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 31 if (jpg->got_picture) //emulating EOI
220 ✗ goto the_end;
221 31 break;
222 31 case EOI:
223 31 goto the_end;
224 4 case DQT:
225 4 ret = ff_mjpeg_decode_dqt(jpg);
226
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 4 if (ret < 0) {
227 ✗ av_log(avctx, AV_LOG_ERROR,
228 "quantization table decode error\n");
229 ✗ return ret;
230 }
231 4 break;
232 8 case DHT:
233 8 ret = ff_mjpeg_decode_dht(jpg);
234
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 8 if (ret < 0) {
235 ✗ av_log(avctx, AV_LOG_ERROR,
236 "huffman table decode error\n");
237 ✗ return ret;
238 }
239 8 break;
240 64 case COM:
241 64 ret = mxpeg_decode_com(s, unescaped_buf_ptr,
242 unescaped_buf_size);
243
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 64 if (ret < 0)
244 ✗ return ret;
245 64 break;
246 2 case SOF0:
247
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 2 if (s->got_sof_data > 1) {
248 ✗ av_log(avctx, AV_LOG_ERROR,
249 "Multiple SOF in a frame\n");
250 ✗ return AVERROR_INVALIDDATA;
251 }
252 2 ret = ff_mjpeg_decode_sof(jpg);
253
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 2 if (ret < 0) {
254 ✗ av_log(avctx, AV_LOG_ERROR,
255 "SOF data decode error\n");
256 ✗ s->got_sof_data = 0;
257 ✗ return ret;
258 }
259
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 2 if (jpg->interlaced) {
260 ✗ av_log(avctx, AV_LOG_ERROR,
261 "Interlaced mode not supported in MxPEG\n");
262 ✗ s->got_sof_data = 0;
263 ✗ return AVERROR(EINVAL);
264 }
265 2 s->got_sof_data ++;
266 2 break;
267 31 case SOS:
268
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 31 if (!s->got_sof_data) {
269 ✗ av_log(avctx, AV_LOG_WARNING,
270 "Can not process SOS without SOF data, skipping\n");
271 ✗ break;
272 }
273
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 31 if (!jpg->got_picture) {
274
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 29 if (jpg->first_picture) {
275 ✗ av_log(avctx, AV_LOG_WARNING,
276 "First picture has no SOF, skipping\n");
277 ✗ break;
278 }
279
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 29 if (!s->got_mxm_bitmask){
280 ✗ av_log(avctx, AV_LOG_WARNING,
281 "Non-key frame has no MXM, skipping\n");
282 ✗ break;
283 }
284 /* use stored SOF data to allocate current picture */
285 29 av_frame_unref(jpg->picture_ptr);
286
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 29 if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
287 AV_GET_BUFFER_FLAG_REF)) < 0)
288 ✗ return ret;
289 29 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
290 29 jpg->picture_ptr->flags &= ~AV_FRAME_FLAG_KEY;
291 29 jpg->got_picture = 1;
292 } else {
293 2 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
294 2 jpg->picture_ptr->flags |= AV_FRAME_FLAG_KEY;
295 }
296
297
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 31 if (s->got_mxm_bitmask) {
298 31 AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
299
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 31 if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
300 ✗ break;
301
302 /* allocate dummy reference picture if needed */
303
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 33 if (!reference_ptr->data[0] &&
304 2 (ret = ff_get_buffer(avctx, reference_ptr,
305 AV_GET_BUFFER_FLAG_REF)) < 0)
306 ✗ return ret;
307
308 31 ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
309
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 31 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
310 ✗ return ret;
311 } else {
312 ✗ ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
313 ✗ if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
314 ✗ return ret;
315 }
316
317 31 break;
318 }
319
320 171 buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
321 }
322
323 }
324
325 ✗ the_end:
326
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 31 if (jpg->got_picture) {
327 31 int ret = av_frame_ref(rframe, jpg->picture_ptr);
328
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 31 if (ret < 0)
329 ✗ return ret;
330 31 *got_frame = 1;
331
332 31 s->picture_index ^= 1;
333 31 jpg->picture_ptr = s->picture[s->picture_index];
334
335
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 31 if (!s->has_complete_frame) {
336 ✗ if (!s->got_mxm_bitmask)
337 ✗ s->has_complete_frame = 1;
338 else
339 ✗ *got_frame = 0;
340 }
341 }
342
343 31 return buf_ptr - buf;
344 }
345
346 const FFCodec ff_mxpeg_decoder = {
347 .p.name = "mxpeg",
348 CODEC_LONG_NAME("Mobotix MxPEG video"),
349 .p.type = AVMEDIA_TYPE_VIDEO,
350 .p.id = AV_CODEC_ID_MXPEG,
351 .priv_data_size = sizeof(MXpegDecodeContext),
352 .init = mxpeg_decode_init,
353 .close = mxpeg_decode_end,
354 FF_CODEC_DECODE_CB(mxpeg_decode_frame),
355 .p.capabilities = AV_CODEC_CAP_DR1,
356 .p.max_lowres = 3,
357 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
358 };
359