| 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 | }; |