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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 "codec_internal.h" | ||
29 | #include "decode.h" | ||
30 | #include "mjpeg.h" | ||
31 | #include "mjpegdec.h" | ||
32 | |||
33 | typedef struct MXpegDecodeContext { | ||
34 | MJpegDecodeContext jpg; | ||
35 | AVFrame *picture[2]; /* pictures array */ | ||
36 | int picture_index; /* index of current picture */ | ||
37 | int got_sof_data; /* true if SOF data successfully parsed */ | ||
38 | int got_mxm_bitmask; /* true if MXM bitmask available */ | ||
39 | uint8_t *mxm_bitmask; /* bitmask buffer */ | ||
40 | unsigned bitmask_size; /* size of bitmask */ | ||
41 | int has_complete_frame; /* true if has complete frame */ | ||
42 | uint8_t *completion_bitmask; /* completion bitmask of macroblocks */ | ||
43 | unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */ | ||
44 | } MXpegDecodeContext; | ||
45 | |||
46 | 2 | static av_cold int mxpeg_decode_end(AVCodecContext *avctx) | |
47 | { | ||
48 | 2 | MXpegDecodeContext *s = avctx->priv_data; | |
49 | 2 | MJpegDecodeContext *jpg = &s->jpg; | |
50 | int i; | ||
51 | |||
52 | 2 | jpg->picture_ptr = NULL; | |
53 | 2 | ff_mjpeg_decode_end(avctx); | |
54 | |||
55 |
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6 | for (i = 0; i < 2; ++i) |
56 | 4 | av_frame_free(&s->picture[i]); | |
57 | |||
58 | 2 | s->bitmask_size = 0; | |
59 | 2 | av_freep(&s->mxm_bitmask); | |
60 | 2 | av_freep(&s->completion_bitmask); | |
61 | |||
62 | 2 | return 0; | |
63 | } | ||
64 | |||
65 | 2 | static av_cold int mxpeg_decode_init(AVCodecContext *avctx) | |
66 | { | ||
67 | 2 | MXpegDecodeContext *s = avctx->priv_data; | |
68 | |||
69 | 2 | s->picture[0] = av_frame_alloc(); | |
70 | 2 | s->picture[1] = av_frame_alloc(); | |
71 |
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2 | if (!s->picture[0] || !s->picture[1]) |
72 | ✗ | return AVERROR(ENOMEM); | |
73 | |||
74 | 2 | s->jpg.picture_ptr = s->picture[0]; | |
75 | 2 | return ff_mjpeg_decode_init(avctx); | |
76 | } | ||
77 | |||
78 | 31 | static int mxpeg_decode_app(MXpegDecodeContext *s, | |
79 | const uint8_t *buf_ptr, int buf_size) | ||
80 | { | ||
81 | int len; | ||
82 |
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31 | if (buf_size < 2) |
83 | ✗ | return 0; | |
84 | 31 | len = AV_RB16(buf_ptr); | |
85 | 31 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); | |
86 | |||
87 | 31 | return 0; | |
88 | } | ||
89 | |||
90 | 31 | static int mxpeg_decode_mxm(MXpegDecodeContext *s, | |
91 | const uint8_t *buf_ptr, int buf_size) | ||
92 | { | ||
93 | unsigned bitmask_size, mb_count; | ||
94 | int i; | ||
95 | |||
96 | 31 | s->mb_width = AV_RL16(buf_ptr+4); | |
97 | 31 | s->mb_height = AV_RL16(buf_ptr+6); | |
98 | 31 | mb_count = s->mb_width * s->mb_height; | |
99 | |||
100 | 31 | bitmask_size = (mb_count + 7) >> 3; | |
101 |
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31 | if (bitmask_size > buf_size - 12) { |
102 | ✗ | av_log(s->jpg.avctx, AV_LOG_ERROR, | |
103 | "MXM bitmask is not complete\n"); | ||
104 | ✗ | return AVERROR(EINVAL); | |
105 | } | ||
106 | |||
107 |
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31 | if (s->bitmask_size != bitmask_size) { |
108 | 2 | s->bitmask_size = 0; | |
109 | 2 | av_freep(&s->mxm_bitmask); | |
110 | 2 | s->mxm_bitmask = av_malloc(bitmask_size); | |
111 |
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2 | if (!s->mxm_bitmask) { |
112 | ✗ | av_log(s->jpg.avctx, AV_LOG_ERROR, | |
113 | "MXM bitmask memory allocation error\n"); | ||
114 | ✗ | return AVERROR(ENOMEM); | |
115 | } | ||
116 | |||
117 | 2 | av_freep(&s->completion_bitmask); | |
118 | 2 | s->completion_bitmask = av_mallocz(bitmask_size); | |
119 |
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2 | if (!s->completion_bitmask) { |
120 | ✗ | av_log(s->jpg.avctx, AV_LOG_ERROR, | |
121 | "Completion bitmask memory allocation error\n"); | ||
122 | ✗ | return AVERROR(ENOMEM); | |
123 | } | ||
124 | |||
125 | 2 | s->bitmask_size = bitmask_size; | |
126 | } | ||
127 | |||
128 | 31 | memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size); | |
129 | 31 | s->got_mxm_bitmask = 1; | |
130 | |||
131 |
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31 | if (!s->has_complete_frame) { |
132 | 2 | uint8_t completion_check = 0xFF; | |
133 |
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1202 | for (i = 0; i < bitmask_size; ++i) { |
134 | 1200 | s->completion_bitmask[i] |= s->mxm_bitmask[i]; | |
135 | 1200 | completion_check &= s->completion_bitmask[i]; | |
136 | } | ||
137 | 2 | s->has_complete_frame = !(completion_check ^ 0xFF); | |
138 | } | ||
139 | |||
140 | 31 | return 0; | |
141 | } | ||
142 | |||
143 | 64 | static int mxpeg_decode_com(MXpegDecodeContext *s, | |
144 | const uint8_t *buf_ptr, int buf_size) | ||
145 | { | ||
146 | 64 | int len, ret = 0; | |
147 |
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64 | if (buf_size < 2) |
148 | ✗ | return 0; | |
149 | 64 | len = AV_RB16(buf_ptr); | |
150 |
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64 | if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) { |
151 | 31 | ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2); | |
152 | } | ||
153 | 64 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); | |
154 | |||
155 | 64 | return ret; | |
156 | } | ||
157 | |||
158 | 31 | static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg, | |
159 | AVFrame *reference_ptr) | ||
160 | { | ||
161 |
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31 | if ((jpg->width + 0x0F)>>4 != s->mb_width || |
162 |
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31 | (jpg->height + 0x0F)>>4 != s->mb_height) { |
163 | ✗ | av_log(jpg->avctx, AV_LOG_ERROR, | |
164 | "Picture dimensions stored in SOF and MXM mismatch\n"); | ||
165 | ✗ | return AVERROR(EINVAL); | |
166 | } | ||
167 | |||
168 |
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31 | if (reference_ptr->data[0]) { |
169 | int i; | ||
170 |
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145 | for (i = 0; i < MAX_COMPONENTS; ++i) { |
171 |
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116 | if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) || |
172 |
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116 | reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) { |
173 | ✗ | av_log(jpg->avctx, AV_LOG_ERROR, | |
174 | "Dimensions of current and reference picture mismatch\n"); | ||
175 | ✗ | return AVERROR(EINVAL); | |
176 | } | ||
177 | } | ||
178 | } | ||
179 | |||
180 | 31 | return 0; | |
181 | } | ||
182 | |||
183 | 31 | static int mxpeg_decode_frame(AVCodecContext *avctx, AVFrame *rframe, | |
184 | int *got_frame, 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 |
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31 | if (avctx->skip_frame == AVDISCARD_ALL) |
197 | ✗ | return AVERROR_PATCHWELCOME; | |
198 | |||
199 | 31 | buf_ptr = buf; | |
200 | 31 | buf_end = buf + buf_size; | |
201 | 31 | jpg->got_picture = 0; | |
202 | 31 | s->got_mxm_bitmask = 0; | |
203 | 31 | s->got_sof_data = !!s->got_sof_data; | |
204 |
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202 | while (buf_ptr < buf_end) { |
205 | 202 | start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end, | |
206 | &unescaped_buf_ptr, &unescaped_buf_size); | ||
207 |
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202 | if (start_code < 0) |
208 | ✗ | goto the_end; | |
209 | { | ||
210 | 202 | init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8); | |
211 | |||
212 |
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202 | if (start_code >= APP0 && start_code <= APP15) { |
213 | 31 | mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size); | |
214 | } | ||
215 | |||
216 |
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202 | switch (start_code) { |
217 | 31 | case SOI: | |
218 |
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31 | if (jpg->got_picture) //emulating EOI |
219 | ✗ | goto the_end; | |
220 | 31 | break; | |
221 | 31 | case EOI: | |
222 | 31 | goto the_end; | |
223 | 4 | case DQT: | |
224 | 4 | ret = ff_mjpeg_decode_dqt(jpg); | |
225 |
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4 | if (ret < 0) { |
226 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
227 | "quantization table decode error\n"); | ||
228 | ✗ | return ret; | |
229 | } | ||
230 | 4 | break; | |
231 | 8 | case DHT: | |
232 | 8 | ret = ff_mjpeg_decode_dht(jpg); | |
233 |
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8 | if (ret < 0) { |
234 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
235 | "huffman table decode error\n"); | ||
236 | ✗ | return ret; | |
237 | } | ||
238 | 8 | break; | |
239 | 64 | case COM: | |
240 | 64 | ret = mxpeg_decode_com(s, unescaped_buf_ptr, | |
241 | unescaped_buf_size); | ||
242 |
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64 | if (ret < 0) |
243 | ✗ | return ret; | |
244 | 64 | break; | |
245 | 2 | case SOF0: | |
246 |
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2 | if (s->got_sof_data > 1) { |
247 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
248 | "Multiple SOF in a frame\n"); | ||
249 | ✗ | return AVERROR_INVALIDDATA; | |
250 | } | ||
251 | 2 | ret = ff_mjpeg_decode_sof(jpg); | |
252 |
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2 | if (ret < 0) { |
253 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
254 | "SOF data decode error\n"); | ||
255 | ✗ | s->got_sof_data = 0; | |
256 | ✗ | return ret; | |
257 | } | ||
258 |
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2 | if (jpg->interlaced) { |
259 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
260 | "Interlaced mode not supported in MxPEG\n"); | ||
261 | ✗ | s->got_sof_data = 0; | |
262 | ✗ | return AVERROR(EINVAL); | |
263 | } | ||
264 | 2 | s->got_sof_data ++; | |
265 | 2 | break; | |
266 | 31 | case SOS: | |
267 |
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31 | if (!s->got_sof_data) { |
268 | ✗ | av_log(avctx, AV_LOG_WARNING, | |
269 | "Can not process SOS without SOF data, skipping\n"); | ||
270 | ✗ | break; | |
271 | } | ||
272 |
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31 | if (!jpg->got_picture) { |
273 |
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29 | if (jpg->first_picture) { |
274 | ✗ | av_log(avctx, AV_LOG_WARNING, | |
275 | "First picture has no SOF, skipping\n"); | ||
276 | ✗ | break; | |
277 | } | ||
278 |
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29 | if (!s->got_mxm_bitmask){ |
279 | ✗ | av_log(avctx, AV_LOG_WARNING, | |
280 | "Non-key frame has no MXM, skipping\n"); | ||
281 | ✗ | break; | |
282 | } | ||
283 | /* use stored SOF data to allocate current picture */ | ||
284 | 29 | av_frame_unref(jpg->picture_ptr); | |
285 |
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29 | if ((ret = ff_get_buffer(avctx, jpg->picture_ptr, |
286 | AV_GET_BUFFER_FLAG_REF)) < 0) | ||
287 | ✗ | return ret; | |
288 | 29 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P; | |
289 | 29 | jpg->picture_ptr->flags &= ~AV_FRAME_FLAG_KEY; | |
290 | 29 | jpg->got_picture = 1; | |
291 | } else { | ||
292 | 2 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I; | |
293 | 2 | jpg->picture_ptr->flags |= AV_FRAME_FLAG_KEY; | |
294 | } | ||
295 | |||
296 |
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31 | if (s->got_mxm_bitmask) { |
297 | 31 | AVFrame *reference_ptr = s->picture[s->picture_index ^ 1]; | |
298 |
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31 | if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0) |
299 | ✗ | break; | |
300 | |||
301 | /* allocate dummy reference picture if needed */ | ||
302 |
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33 | if (!reference_ptr->data[0] && |
303 | 2 | (ret = ff_get_buffer(avctx, reference_ptr, | |
304 | AV_GET_BUFFER_FLAG_REF)) < 0) | ||
305 | ✗ | return ret; | |
306 | |||
307 | 31 | ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr); | |
308 |
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31 | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) |
309 | ✗ | return ret; | |
310 | } else { | ||
311 | ✗ | ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL); | |
312 | ✗ | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) | |
313 | ✗ | return ret; | |
314 | } | ||
315 | |||
316 | 31 | break; | |
317 | } | ||
318 | |||
319 | 171 | buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3; | |
320 | } | ||
321 | |||
322 | } | ||
323 | |||
324 | ✗ | the_end: | |
325 |
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31 | if (jpg->got_picture) { |
326 | 31 | int ret = av_frame_ref(rframe, jpg->picture_ptr); | |
327 |
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31 | if (ret < 0) |
328 | ✗ | return ret; | |
329 | 31 | *got_frame = 1; | |
330 | |||
331 | 31 | s->picture_index ^= 1; | |
332 | 31 | jpg->picture_ptr = s->picture[s->picture_index]; | |
333 | |||
334 |
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31 | if (!s->has_complete_frame) { |
335 | ✗ | if (!s->got_mxm_bitmask) | |
336 | ✗ | s->has_complete_frame = 1; | |
337 | else | ||
338 | ✗ | *got_frame = 0; | |
339 | } | ||
340 | } | ||
341 | |||
342 | 31 | return buf_ptr - buf; | |
343 | } | ||
344 | |||
345 | const FFCodec ff_mxpeg_decoder = { | ||
346 | .p.name = "mxpeg", | ||
347 | CODEC_LONG_NAME("Mobotix MxPEG video"), | ||
348 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
349 | .p.id = AV_CODEC_ID_MXPEG, | ||
350 | .priv_data_size = sizeof(MXpegDecodeContext), | ||
351 | .init = mxpeg_decode_init, | ||
352 | .close = mxpeg_decode_end, | ||
353 | FF_CODEC_DECODE_CB(mxpeg_decode_frame), | ||
354 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
355 | .p.max_lowres = 3, | ||
356 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
357 | }; | ||
358 |