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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 "libavutil/mem.h" | ||
29 | #include "codec_internal.h" | ||
30 | #include "decode.h" | ||
31 | #include "hpeldsp.h" | ||
32 | #include "mjpeg.h" | ||
33 | #include "mjpegdec.h" | ||
34 | |||
35 | typedef struct MXpegDecodeContext { | ||
36 | MJpegDecodeContext jpg; | ||
37 | AVFrame *picture[2]; /* pictures array */ | ||
38 | int picture_index; /* index of current picture */ | ||
39 | int got_sof_data; /* true if SOF data successfully parsed */ | ||
40 | int got_mxm_bitmask; /* true if MXM bitmask available */ | ||
41 | uint8_t *mxm_bitmask; /* bitmask buffer */ | ||
42 | unsigned bitmask_size; /* size of bitmask */ | ||
43 | int has_complete_frame; /* true if has complete frame */ | ||
44 | uint8_t *completion_bitmask; /* completion bitmask of macroblocks */ | ||
45 | unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */ | ||
46 | } MXpegDecodeContext; | ||
47 | |||
48 | 2 | static av_cold int mxpeg_decode_end(AVCodecContext *avctx) | |
49 | { | ||
50 | 2 | MXpegDecodeContext *s = avctx->priv_data; | |
51 | int i; | ||
52 | |||
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 | HpelDSPContext hdsp; | ||
69 | |||
70 | 2 | ff_hpeldsp_init(&hdsp, avctx->flags); | |
71 | 2 | s->jpg.copy_block = hdsp.put_pixels_tab[1][0]; | |
72 | |||
73 | 2 | s->picture[0] = av_frame_alloc(); | |
74 | 2 | s->picture[1] = av_frame_alloc(); | |
75 |
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2 | if (!s->picture[0] || !s->picture[1]) |
76 | ✗ | return AVERROR(ENOMEM); | |
77 | |||
78 | 2 | s->jpg.picture_ptr = s->picture[0]; | |
79 | 2 | return ff_mjpeg_decode_init(avctx); | |
80 | } | ||
81 | |||
82 | 31 | static int mxpeg_decode_app(MXpegDecodeContext *s, | |
83 | const uint8_t *buf_ptr, int buf_size) | ||
84 | { | ||
85 | int len; | ||
86 |
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31 | if (buf_size < 2) |
87 | ✗ | return 0; | |
88 | 31 | len = AV_RB16(buf_ptr); | |
89 | 31 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); | |
90 | |||
91 | 31 | return 0; | |
92 | } | ||
93 | |||
94 | 31 | static int mxpeg_decode_mxm(MXpegDecodeContext *s, | |
95 | const uint8_t *buf_ptr, int buf_size) | ||
96 | { | ||
97 | unsigned bitmask_size, mb_count; | ||
98 | int i; | ||
99 | |||
100 | 31 | s->mb_width = AV_RL16(buf_ptr+4); | |
101 | 31 | s->mb_height = AV_RL16(buf_ptr+6); | |
102 | 31 | mb_count = s->mb_width * s->mb_height; | |
103 | |||
104 | 31 | bitmask_size = (mb_count + 7) >> 3; | |
105 |
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31 | if (bitmask_size > buf_size - 12) { |
106 | ✗ | av_log(s->jpg.avctx, AV_LOG_ERROR, | |
107 | "MXM bitmask is not complete\n"); | ||
108 | ✗ | return AVERROR(EINVAL); | |
109 | } | ||
110 | |||
111 |
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31 | if (s->bitmask_size != bitmask_size) { |
112 | 2 | s->bitmask_size = 0; | |
113 | 2 | av_freep(&s->mxm_bitmask); | |
114 | 2 | s->mxm_bitmask = av_malloc(bitmask_size); | |
115 |
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2 | if (!s->mxm_bitmask) { |
116 | ✗ | av_log(s->jpg.avctx, AV_LOG_ERROR, | |
117 | "MXM bitmask memory allocation error\n"); | ||
118 | ✗ | return AVERROR(ENOMEM); | |
119 | } | ||
120 | |||
121 | 2 | av_freep(&s->completion_bitmask); | |
122 | 2 | s->completion_bitmask = av_mallocz(bitmask_size); | |
123 |
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2 | if (!s->completion_bitmask) { |
124 | ✗ | av_log(s->jpg.avctx, AV_LOG_ERROR, | |
125 | "Completion bitmask memory allocation error\n"); | ||
126 | ✗ | return AVERROR(ENOMEM); | |
127 | } | ||
128 | |||
129 | 2 | s->bitmask_size = bitmask_size; | |
130 | } | ||
131 | |||
132 | 31 | memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size); | |
133 | 31 | s->got_mxm_bitmask = 1; | |
134 | |||
135 |
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31 | if (!s->has_complete_frame) { |
136 | 2 | uint8_t completion_check = 0xFF; | |
137 |
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1202 | for (i = 0; i < bitmask_size; ++i) { |
138 | 1200 | s->completion_bitmask[i] |= s->mxm_bitmask[i]; | |
139 | 1200 | completion_check &= s->completion_bitmask[i]; | |
140 | } | ||
141 | 2 | s->has_complete_frame = !(completion_check ^ 0xFF); | |
142 | } | ||
143 | |||
144 | 31 | return 0; | |
145 | } | ||
146 | |||
147 | 64 | static int mxpeg_decode_com(MXpegDecodeContext *s, | |
148 | const uint8_t *buf_ptr, int buf_size) | ||
149 | { | ||
150 | 64 | int len, ret = 0; | |
151 |
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64 | if (buf_size < 2) |
152 | ✗ | return 0; | |
153 | 64 | len = AV_RB16(buf_ptr); | |
154 |
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64 | if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) { |
155 | 31 | ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2); | |
156 | } | ||
157 | 64 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); | |
158 | |||
159 | 64 | return ret; | |
160 | } | ||
161 | |||
162 | 31 | static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg, | |
163 | AVFrame *reference_ptr) | ||
164 | { | ||
165 |
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31 | if ((jpg->width + 0x0F)>>4 != s->mb_width || |
166 |
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31 | (jpg->height + 0x0F)>>4 != s->mb_height) { |
167 | ✗ | av_log(jpg->avctx, AV_LOG_ERROR, | |
168 | "Picture dimensions stored in SOF and MXM mismatch\n"); | ||
169 | ✗ | return AVERROR(EINVAL); | |
170 | } | ||
171 | |||
172 |
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31 | if (reference_ptr->data[0]) { |
173 | int i; | ||
174 |
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145 | for (i = 0; i < MAX_COMPONENTS; ++i) { |
175 |
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116 | if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) || |
176 |
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116 | reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) { |
177 | ✗ | av_log(jpg->avctx, AV_LOG_ERROR, | |
178 | "Dimensions of current and reference picture mismatch\n"); | ||
179 | ✗ | return AVERROR(EINVAL); | |
180 | } | ||
181 | } | ||
182 |
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29 | if (reference_ptr->width != jpg->picture_ptr->width || |
183 |
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29 | reference_ptr->height != jpg->picture_ptr->height || |
184 |
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29 | reference_ptr->format != jpg->picture_ptr->format) { |
185 | ✗ | av_log(jpg->avctx, AV_LOG_ERROR, "Reference mismatching\n"); | |
186 | ✗ | return AVERROR_INVALIDDATA; | |
187 | } | ||
188 | } | ||
189 | |||
190 | 31 | return 0; | |
191 | } | ||
192 | |||
193 | 31 | static int mxpeg_decode_frame(AVCodecContext *avctx, AVFrame *rframe, | |
194 | int *got_frame, AVPacket *avpkt) | ||
195 | { | ||
196 | 31 | const uint8_t *buf = avpkt->data; | |
197 | 31 | int buf_size = avpkt->size; | |
198 | 31 | MXpegDecodeContext *s = avctx->priv_data; | |
199 | 31 | MJpegDecodeContext *jpg = &s->jpg; | |
200 | const uint8_t *buf_end, *buf_ptr; | ||
201 | const uint8_t *unescaped_buf_ptr; | ||
202 | int unescaped_buf_size; | ||
203 | int start_code; | ||
204 | int ret; | ||
205 | |||
206 |
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31 | if (avctx->skip_frame == AVDISCARD_ALL) |
207 | ✗ | return AVERROR_PATCHWELCOME; | |
208 | |||
209 | 31 | buf_ptr = buf; | |
210 | 31 | buf_end = buf + buf_size; | |
211 | 31 | jpg->got_picture = 0; | |
212 | 31 | s->got_mxm_bitmask = 0; | |
213 | 31 | s->got_sof_data = !!s->got_sof_data; | |
214 |
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202 | while (buf_ptr < buf_end) { |
215 | 202 | start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end, | |
216 | &unescaped_buf_ptr, &unescaped_buf_size); | ||
217 |
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202 | if (start_code < 0) |
218 | ✗ | goto the_end; | |
219 | { | ||
220 | 202 | init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8); | |
221 | |||
222 |
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202 | if (start_code >= APP0 && start_code <= APP15) { |
223 | 31 | mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size); | |
224 | } | ||
225 | |||
226 |
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202 | switch (start_code) { |
227 | 31 | case SOI: | |
228 |
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31 | if (jpg->got_picture) //emulating EOI |
229 | ✗ | goto the_end; | |
230 | 31 | break; | |
231 | 31 | case EOI: | |
232 | 31 | goto the_end; | |
233 | 4 | case DQT: | |
234 | 4 | ret = ff_mjpeg_decode_dqt(jpg); | |
235 |
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4 | if (ret < 0) { |
236 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
237 | "quantization table decode error\n"); | ||
238 | ✗ | return ret; | |
239 | } | ||
240 | 4 | break; | |
241 | 8 | case DHT: | |
242 | 8 | ret = ff_mjpeg_decode_dht(jpg); | |
243 |
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8 | if (ret < 0) { |
244 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
245 | "huffman table decode error\n"); | ||
246 | ✗ | return ret; | |
247 | } | ||
248 | 8 | break; | |
249 | 64 | case COM: | |
250 | 64 | ret = mxpeg_decode_com(s, unescaped_buf_ptr, | |
251 | unescaped_buf_size); | ||
252 |
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64 | if (ret < 0) |
253 | ✗ | return ret; | |
254 | 64 | break; | |
255 | 2 | case SOF0: | |
256 |
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2 | if (s->got_sof_data > 1) { |
257 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
258 | "Multiple SOF in a frame\n"); | ||
259 | ✗ | return AVERROR_INVALIDDATA; | |
260 | } | ||
261 | 2 | ret = ff_mjpeg_decode_sof(jpg); | |
262 |
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2 | if (ret < 0) { |
263 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
264 | "SOF data decode error\n"); | ||
265 | ✗ | s->got_sof_data = 0; | |
266 | ✗ | return ret; | |
267 | } | ||
268 |
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2 | if (jpg->interlaced) { |
269 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
270 | "Interlaced mode not supported in MxPEG\n"); | ||
271 | ✗ | s->got_sof_data = 0; | |
272 | ✗ | return AVERROR(EINVAL); | |
273 | } | ||
274 | 2 | s->got_sof_data ++; | |
275 | 2 | break; | |
276 | 31 | case SOS: | |
277 |
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31 | if (!s->got_sof_data) { |
278 | ✗ | av_log(avctx, AV_LOG_WARNING, | |
279 | "Can not process SOS without SOF data, skipping\n"); | ||
280 | ✗ | break; | |
281 | } | ||
282 |
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31 | if (!jpg->got_picture) { |
283 |
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29 | if (jpg->first_picture) { |
284 | ✗ | av_log(avctx, AV_LOG_WARNING, | |
285 | "First picture has no SOF, skipping\n"); | ||
286 | ✗ | break; | |
287 | } | ||
288 |
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29 | if (!s->got_mxm_bitmask){ |
289 | ✗ | av_log(avctx, AV_LOG_WARNING, | |
290 | "Non-key frame has no MXM, skipping\n"); | ||
291 | ✗ | break; | |
292 | } | ||
293 | /* use stored SOF data to allocate current picture */ | ||
294 | 29 | av_frame_unref(jpg->picture_ptr); | |
295 |
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29 | if ((ret = ff_get_buffer(avctx, jpg->picture_ptr, |
296 | AV_GET_BUFFER_FLAG_REF)) < 0) | ||
297 | ✗ | return ret; | |
298 | 29 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P; | |
299 | 29 | jpg->picture_ptr->flags &= ~AV_FRAME_FLAG_KEY; | |
300 | 29 | jpg->got_picture = 1; | |
301 | } else { | ||
302 | 2 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I; | |
303 | 2 | jpg->picture_ptr->flags |= AV_FRAME_FLAG_KEY; | |
304 | } | ||
305 | |||
306 |
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31 | if (s->got_mxm_bitmask) { |
307 | 31 | AVFrame *reference_ptr = s->picture[s->picture_index ^ 1]; | |
308 |
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31 | if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0) |
309 | ✗ | break; | |
310 | |||
311 | /* allocate dummy reference picture if needed */ | ||
312 |
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33 | if (!reference_ptr->data[0] && |
313 | 2 | (ret = ff_get_buffer(avctx, reference_ptr, | |
314 | AV_GET_BUFFER_FLAG_REF)) < 0) | ||
315 | ✗ | return ret; | |
316 | |||
317 | 31 | ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr); | |
318 |
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31 | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) |
319 | ✗ | return ret; | |
320 | } else { | ||
321 | ✗ | ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL); | |
322 | ✗ | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) | |
323 | ✗ | return ret; | |
324 | } | ||
325 | |||
326 | 31 | break; | |
327 | } | ||
328 | |||
329 | 171 | buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3; | |
330 | } | ||
331 | |||
332 | } | ||
333 | |||
334 | ✗ | the_end: | |
335 |
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31 | if (jpg->got_picture) { |
336 | 31 | int ret = av_frame_ref(rframe, jpg->picture_ptr); | |
337 |
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31 | if (ret < 0) |
338 | ✗ | return ret; | |
339 | 31 | *got_frame = 1; | |
340 | |||
341 | 31 | s->picture_index ^= 1; | |
342 | 31 | jpg->picture_ptr = s->picture[s->picture_index]; | |
343 | |||
344 |
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31 | if (!s->has_complete_frame) { |
345 | ✗ | if (!s->got_mxm_bitmask) | |
346 | ✗ | s->has_complete_frame = 1; | |
347 | else | ||
348 | ✗ | *got_frame = 0; | |
349 | } | ||
350 | } | ||
351 | |||
352 | 31 | return buf_ptr - buf; | |
353 | } | ||
354 | |||
355 | const FFCodec ff_mxpeg_decoder = { | ||
356 | .p.name = "mxpeg", | ||
357 | CODEC_LONG_NAME("Mobotix MxPEG video"), | ||
358 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
359 | .p.id = AV_CODEC_ID_MXPEG, | ||
360 | .priv_data_size = sizeof(MXpegDecodeContext), | ||
361 | .init = mxpeg_decode_init, | ||
362 | .close = mxpeg_decode_end, | ||
363 | FF_CODEC_DECODE_CB(mxpeg_decode_frame), | ||
364 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
365 | .p.max_lowres = 3, | ||
366 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
367 | }; | ||
368 |