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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 "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 | static av_cold int mxpeg_decode_end(AVCodecContext *avctx) | |
46 | { | |
47 | MXpegDecodeContext *s = avctx->priv_data; | |
48 | MJpegDecodeContext *jpg = &s->jpg; | |
49 | int i; | |
50 | ||
51 | jpg->picture_ptr = NULL; | |
52 | ff_mjpeg_decode_end(avctx); | |
53 | ||
54 | for (i = 0; i < 2; ++i) | |
55 | av_frame_free(&s->picture[i]); | |
56 | ||
57 | s->bitmask_size = 0; | |
58 | av_freep(&s->mxm_bitmask); | |
59 | av_freep(&s->completion_bitmask); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | static av_cold int mxpeg_decode_init(AVCodecContext *avctx) | |
65 | { | |
66 | MXpegDecodeContext *s = avctx->priv_data; | |
67 | ||
68 | s->picture[0] = av_frame_alloc(); | |
69 | s->picture[1] = av_frame_alloc(); | |
70 | if (!s->picture[0] || !s->picture[1]) { | |
71 | mxpeg_decode_end(avctx); | |
72 | return AVERROR(ENOMEM); | |
73 | } | |
74 | ||
75 | s->jpg.picture_ptr = s->picture[0]; | |
76 | return ff_mjpeg_decode_init(avctx); | |
77 | } | |
78 | ||
79 | static int mxpeg_decode_app(MXpegDecodeContext *s, | |
80 | const uint8_t *buf_ptr, int buf_size) | |
81 | { | |
82 | int len; | |
83 | if (buf_size < 2) | |
84 | return 0; | |
85 | len = AV_RB16(buf_ptr); | |
86 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | 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 | s->mb_width = AV_RL16(buf_ptr+4); | |
98 | s->mb_height = AV_RL16(buf_ptr+6); | |
99 | mb_count = s->mb_width * s->mb_height; | |
100 | ||
101 | bitmask_size = (mb_count + 7) >> 3; | |
102 | 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 | if (s->bitmask_size != bitmask_size) { | |
109 | s->bitmask_size = 0; | |
110 | av_freep(&s->mxm_bitmask); | |
111 | s->mxm_bitmask = av_malloc(bitmask_size); | |
112 | 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 | av_freep(&s->completion_bitmask); | |
119 | s->completion_bitmask = av_mallocz(bitmask_size); | |
120 | 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 | s->bitmask_size = bitmask_size; | |
127 | } | |
128 | ||
129 | memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size); | |
130 | s->got_mxm_bitmask = 1; | |
131 | ||
132 | if (!s->has_complete_frame) { | |
133 | uint8_t completion_check = 0xFF; | |
134 | for (i = 0; i < bitmask_size; ++i) { | |
135 | s->completion_bitmask[i] |= s->mxm_bitmask[i]; | |
136 | completion_check &= s->completion_bitmask[i]; | |
137 | } | |
138 | s->has_complete_frame = !(completion_check ^ 0xFF); | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int mxpeg_decode_com(MXpegDecodeContext *s, | |
145 | const uint8_t *buf_ptr, int buf_size) | |
146 | { | |
147 | int len, ret = 0; | |
148 | if (buf_size < 2) | |
149 | return 0; | |
150 | len = AV_RB16(buf_ptr); | |
151 | if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) { | |
152 | ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2); | |
153 | } | |
154 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg, | |
160 | AVFrame *reference_ptr) | |
161 | { | |
162 | if ((jpg->width + 0x0F)>>4 != s->mb_width || | |
163 | (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 | if (reference_ptr->data[0]) { | |
170 | int i; | |
171 | for (i = 0; i < MAX_COMPONENTS; ++i) { | |
172 | if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) || | |
173 | 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 | return 0; | |
182 | } | |
183 | ||
184 | static int mxpeg_decode_frame(AVCodecContext *avctx, | |
185 | void *data, int *got_frame, | |
186 | AVPacket *avpkt) | |
187 | { | |
188 | const uint8_t *buf = avpkt->data; | |
189 | int buf_size = avpkt->size; | |
190 | MXpegDecodeContext *s = avctx->priv_data; | |
191 | MJpegDecodeContext *jpg = &s->jpg; | |
192 | const uint8_t *buf_end, *buf_ptr; | |
193 | const uint8_t *unescaped_buf_ptr; | |
194 | int unescaped_buf_size; | |
195 | int start_code; | |
196 | int ret; | |
197 | ||
198 | buf_ptr = buf; | |
199 | buf_end = buf + buf_size; | |
200 | jpg->got_picture = 0; | |
201 | s->got_mxm_bitmask = 0; | |
202 | while (buf_ptr < buf_end) { | |
203 | start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end, | |
204 | &unescaped_buf_ptr, &unescaped_buf_size); | |
205 | if (start_code < 0) | |
206 | goto the_end; | |
207 | { | |
208 | init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8); | |
209 | ||
210 | if (start_code >= APP0 && start_code <= APP15) { | |
211 | mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size); | |
212 | } | |
213 | ||
214 | switch (start_code) { | |
215 | case SOI: | |
216 | if (jpg->got_picture) //emulating EOI | |
217 | goto the_end; | |
218 | break; | |
219 | case EOI: | |
220 | goto the_end; | |
221 | case DQT: | |
222 | ret = ff_mjpeg_decode_dqt(jpg); | |
223 | if (ret < 0) { | |
224 | av_log(avctx, AV_LOG_ERROR, | |
225 | "quantization table decode error\n"); | |
226 | return ret; | |
227 | } | |
228 | break; | |
229 | case DHT: | |
230 | ret = ff_mjpeg_decode_dht(jpg); | |
231 | if (ret < 0) { | |
232 | av_log(avctx, AV_LOG_ERROR, | |
233 | "huffman table decode error\n"); | |
234 | return ret; | |
235 | } | |
236 | break; | |
237 | case COM: | |
238 | ret = mxpeg_decode_com(s, unescaped_buf_ptr, | |
239 | unescaped_buf_size); | |
240 | if (ret < 0) | |
241 | return ret; | |
242 | break; | |
243 | case SOF0: | |
244 | s->got_sof_data = 0; | |
245 | ret = ff_mjpeg_decode_sof(jpg); | |
246 | if (ret < 0) { | |
247 | av_log(avctx, AV_LOG_ERROR, | |
248 | "SOF data decode error\n"); | |
249 | return ret; | |
250 | } | |
251 | if (jpg->interlaced) { | |
252 | av_log(avctx, AV_LOG_ERROR, | |
253 | "Interlaced mode not supported in MxPEG\n"); | |
254 | return AVERROR(EINVAL); | |
255 | } | |
256 | s->got_sof_data = 1; | |
257 | break; | |
258 | case SOS: | |
259 | if (!s->got_sof_data) { | |
260 | av_log(avctx, AV_LOG_WARNING, | |
261 | "Can not process SOS without SOF data, skipping\n"); | |
262 | break; | |
263 | } | |
264 | if (!jpg->got_picture) { | |
265 | if (jpg->first_picture) { | |
266 | av_log(avctx, AV_LOG_WARNING, | |
267 | "First picture has no SOF, skipping\n"); | |
268 | break; | |
269 | } | |
270 | if (!s->got_mxm_bitmask){ | |
271 | av_log(avctx, AV_LOG_WARNING, | |
272 | "Non-key frame has no MXM, skipping\n"); | |
273 | break; | |
274 | } | |
275 | /* use stored SOF data to allocate current picture */ | |
276 | av_frame_unref(jpg->picture_ptr); | |
277 | if ((ret = ff_get_buffer(avctx, jpg->picture_ptr, | |
278 | AV_GET_BUFFER_FLAG_REF)) < 0) | |
279 | return ret; | |
280 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P; | |
281 | jpg->picture_ptr->key_frame = 0; | |
282 | jpg->got_picture = 1; | |
283 | } else { | |
284 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I; | |
285 | jpg->picture_ptr->key_frame = 1; | |
286 | } | |
287 | ||
288 | if (s->got_mxm_bitmask) { | |
289 | AVFrame *reference_ptr = s->picture[s->picture_index ^ 1]; | |
290 | if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0) | |
291 | break; | |
292 | ||
293 | /* allocate dummy reference picture if needed */ | |
294 | if (!reference_ptr->data[0] && | |
295 | (ret = ff_get_buffer(avctx, reference_ptr, | |
296 | AV_GET_BUFFER_FLAG_REF)) < 0) | |
297 | return ret; | |
298 | ||
299 | ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr); | |
300 | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) | |
301 | return ret; | |
302 | } else { | |
303 | ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL); | |
304 | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) | |
305 | return ret; | |
306 | } | |
307 | ||
308 | break; | |
309 | } | |
310 | ||
311 | buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3; | |
312 | } | |
313 | ||
314 | } | |
315 | ||
316 | the_end: | |
317 | if (jpg->got_picture) { | |
318 | int ret = av_frame_ref(data, jpg->picture_ptr); | |
319 | if (ret < 0) | |
320 | return ret; | |
321 | *got_frame = 1; | |
322 | ||
323 | s->picture_index ^= 1; | |
324 | jpg->picture_ptr = s->picture[s->picture_index]; | |
325 | ||
326 | if (!s->has_complete_frame) { | |
327 | if (!s->got_mxm_bitmask) | |
328 | s->has_complete_frame = 1; | |
329 | else | |
330 | *got_frame = 0; | |
331 | } | |
332 | } | |
333 | ||
334 | return buf_ptr - buf; | |
335 | } | |
336 | ||
337 | AVCodec ff_mxpeg_decoder = { | |
338 | .name = "mxpeg", | |
339 | .long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"), | |
340 | .type = AVMEDIA_TYPE_VIDEO, | |
341 | .id = AV_CODEC_ID_MXPEG, | |
342 | .priv_data_size = sizeof(MXpegDecodeContext), | |
343 | .init = mxpeg_decode_init, | |
344 | .close = mxpeg_decode_end, | |
345 | .decode = mxpeg_decode_frame, | |
346 | .capabilities = CODEC_CAP_DR1, | |
347 | .max_lowres = 3, | |
348 | }; |