blob: 2e3ebe6e70ec620d887295b0a455484bf0aa4843
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 = AV_CODEC_CAP_DR1, |
347 | .max_lowres = 3, |
348 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
349 | }; |
350 |