| 1 | /* |
| 2 | * DPX (.dpx) image decoder |
| 3 | * Copyright (c) 2009 Jimmy Christensen |
| 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 | #include "libavutil/intreadwrite.h" |
| 23 | #include "libavutil/intfloat.h" |
| 24 | #include "libavutil/imgutils.h" |
| 25 | #include "bytestream.h" |
| 26 | #include "avcodec.h" |
| 27 | #include "internal.h" |
| 28 | |
| 29 | static unsigned int read16(const uint8_t **ptr, int is_big) |
| 30 | { |
| 31 | unsigned int temp; |
| 32 | if (is_big) { |
| 33 | temp = AV_RB16(*ptr); |
| 34 | } else { |
| 35 | temp = AV_RL16(*ptr); |
| 36 | } |
| 37 | *ptr += 2; |
| 38 | return temp; |
| 39 | } |
| 40 | |
| 41 | static unsigned int read32(const uint8_t **ptr, int is_big) |
| 42 | { |
| 43 | unsigned int temp; |
| 44 | if (is_big) { |
| 45 | temp = AV_RB32(*ptr); |
| 46 | } else { |
| 47 | temp = AV_RL32(*ptr); |
| 48 | } |
| 49 | *ptr += 4; |
| 50 | return temp; |
| 51 | } |
| 52 | |
| 53 | static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf, |
| 54 | int * n_datum, int is_big) |
| 55 | { |
| 56 | if (*n_datum) |
| 57 | (*n_datum)--; |
| 58 | else { |
| 59 | *lbuf = read32(ptr, is_big); |
| 60 | *n_datum = 2; |
| 61 | } |
| 62 | |
| 63 | *lbuf = (*lbuf << 10) | (*lbuf >> 22); |
| 64 | |
| 65 | return *lbuf & 0x3FF; |
| 66 | } |
| 67 | |
| 68 | static int decode_frame(AVCodecContext *avctx, |
| 69 | void *data, |
| 70 | int *got_frame, |
| 71 | AVPacket *avpkt) |
| 72 | { |
| 73 | const uint8_t *buf = avpkt->data; |
| 74 | int buf_size = avpkt->size; |
| 75 | AVFrame *const p = data; |
| 76 | uint8_t *ptr[AV_NUM_DATA_POINTERS]; |
| 77 | |
| 78 | unsigned int offset; |
| 79 | int magic_num, endian; |
| 80 | int x, y, stride, i, ret; |
| 81 | int w, h, bits_per_color, descriptor, elements, packing; |
| 82 | int encoding, need_align = 0; |
| 83 | |
| 84 | unsigned int rgbBuffer = 0; |
| 85 | int n_datum = 0; |
| 86 | |
| 87 | if (avpkt->size <= 1634) { |
| 88 | av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n"); |
| 89 | return AVERROR_INVALIDDATA; |
| 90 | } |
| 91 | |
| 92 | magic_num = AV_RB32(buf); |
| 93 | buf += 4; |
| 94 | |
| 95 | /* Check if the files "magic number" is "SDPX" which means it uses |
| 96 | * big-endian or XPDS which is for little-endian files */ |
| 97 | if (magic_num == AV_RL32("SDPX")) { |
| 98 | endian = 0; |
| 99 | } else if (magic_num == AV_RB32("SDPX")) { |
| 100 | endian = 1; |
| 101 | } else { |
| 102 | av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n"); |
| 103 | return AVERROR_INVALIDDATA; |
| 104 | } |
| 105 | |
| 106 | offset = read32(&buf, endian); |
| 107 | if (avpkt->size <= offset) { |
| 108 | av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n"); |
| 109 | return AVERROR_INVALIDDATA; |
| 110 | } |
| 111 | |
| 112 | // Check encryption |
| 113 | buf = avpkt->data + 660; |
| 114 | ret = read32(&buf, endian); |
| 115 | if (ret != 0xFFFFFFFF) { |
| 116 | avpriv_report_missing_feature(avctx, "Encryption"); |
| 117 | av_log(avctx, AV_LOG_WARNING, "The image is encrypted and may " |
| 118 | "not properly decode.\n"); |
| 119 | } |
| 120 | |
| 121 | // Need to end in 0x304 offset from start of file |
| 122 | buf = avpkt->data + 0x304; |
| 123 | w = read32(&buf, endian); |
| 124 | h = read32(&buf, endian); |
| 125 | |
| 126 | if ((ret = ff_set_dimensions(avctx, w, h)) < 0) |
| 127 | return ret; |
| 128 | |
| 129 | // Need to end in 0x320 to read the descriptor |
| 130 | buf += 20; |
| 131 | descriptor = buf[0]; |
| 132 | |
| 133 | // Need to end in 0x323 to read the bits per color |
| 134 | buf += 3; |
| 135 | avctx->bits_per_raw_sample = |
| 136 | bits_per_color = buf[0]; |
| 137 | buf++; |
| 138 | packing = read16(&buf, endian); |
| 139 | encoding = read16(&buf, endian); |
| 140 | |
| 141 | if (packing > 1) { |
| 142 | avpriv_report_missing_feature(avctx, "Packing %d", packing); |
| 143 | return AVERROR_PATCHWELCOME; |
| 144 | } |
| 145 | if (encoding) { |
| 146 | avpriv_report_missing_feature(avctx, "Encoding %d", encoding); |
| 147 | return AVERROR_PATCHWELCOME; |
| 148 | } |
| 149 | |
| 150 | buf += 820; |
| 151 | avctx->sample_aspect_ratio.num = read32(&buf, endian); |
| 152 | avctx->sample_aspect_ratio.den = read32(&buf, endian); |
| 153 | if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) |
| 154 | av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den, |
| 155 | avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, |
| 156 | 0x10000); |
| 157 | else |
| 158 | avctx->sample_aspect_ratio = (AVRational){ 0, 1 }; |
| 159 | |
| 160 | if (offset >= 1724 + 4) { |
| 161 | buf = avpkt->data + 1724; |
| 162 | i = read32(&buf, endian); |
| 163 | if(i) { |
| 164 | AVRational q = av_d2q(av_int2float(i), 4096); |
| 165 | if (q.num > 0 && q.den > 0) |
| 166 | avctx->framerate = q; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | switch (descriptor) { |
| 171 | case 6: // Y |
| 172 | elements = 1; |
| 173 | break; |
| 174 | case 52: // ABGR |
| 175 | case 51: // RGBA |
| 176 | elements = 4; |
| 177 | break; |
| 178 | case 50: // RGB |
| 179 | elements = 3; |
| 180 | break; |
| 181 | default: |
| 182 | avpriv_report_missing_feature(avctx, "Descriptor %d", descriptor); |
| 183 | return AVERROR_PATCHWELCOME; |
| 184 | } |
| 185 | |
| 186 | switch (bits_per_color) { |
| 187 | case 8: |
| 188 | stride = avctx->width * elements; |
| 189 | break; |
| 190 | case 10: |
| 191 | if (!packing) { |
| 192 | av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n"); |
| 193 | return -1; |
| 194 | } |
| 195 | stride = (avctx->width * elements + 2) / 3 * 4; |
| 196 | break; |
| 197 | case 12: |
| 198 | if (!packing) { |
| 199 | av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n"); |
| 200 | return -1; |
| 201 | } |
| 202 | stride = 2 * avctx->width * elements; |
| 203 | break; |
| 204 | case 16: |
| 205 | stride = 2 * avctx->width * elements; |
| 206 | break; |
| 207 | case 1: |
| 208 | case 32: |
| 209 | case 64: |
| 210 | avpriv_report_missing_feature(avctx, "Depth %d", bits_per_color); |
| 211 | return AVERROR_PATCHWELCOME; |
| 212 | default: |
| 213 | return AVERROR_INVALIDDATA; |
| 214 | } |
| 215 | |
| 216 | // Table 3c: Runs will always break at scan line boundaries. Packing |
| 217 | // will always break to the next 32-bit word at scan-line boundaries. |
| 218 | // Unfortunately, the encoder produced invalid files, so attempt |
| 219 | // to detect it |
| 220 | need_align = FFALIGN(stride, 4); |
| 221 | if (need_align*avctx->height + (int64_t)offset > avpkt->size) { |
| 222 | // Alignment seems unappliable, try without |
| 223 | if (stride*avctx->height + (int64_t)offset > avpkt->size) { |
| 224 | av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n"); |
| 225 | return AVERROR_INVALIDDATA; |
| 226 | } else { |
| 227 | av_log(avctx, AV_LOG_INFO, "Decoding DPX without scanline " |
| 228 | "alignment.\n"); |
| 229 | need_align = 0; |
| 230 | } |
| 231 | } else { |
| 232 | need_align -= stride; |
| 233 | stride = FFALIGN(stride, 4); |
| 234 | } |
| 235 | |
| 236 | switch (1000 * descriptor + 10 * bits_per_color + endian) { |
| 237 | case 6081: |
| 238 | case 6080: |
| 239 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
| 240 | break; |
| 241 | case 50081: |
| 242 | case 50080: |
| 243 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 244 | break; |
| 245 | case 52081: |
| 246 | case 52080: |
| 247 | avctx->pix_fmt = AV_PIX_FMT_ABGR; |
| 248 | break; |
| 249 | case 51081: |
| 250 | case 51080: |
| 251 | avctx->pix_fmt = AV_PIX_FMT_RGBA; |
| 252 | break; |
| 253 | case 50100: |
| 254 | case 51100: |
| 255 | case 50101: |
| 256 | case 51101: |
| 257 | avctx->pix_fmt = AV_PIX_FMT_GBRP10; |
| 258 | break; |
| 259 | case 50120: |
| 260 | case 51120: |
| 261 | case 50121: |
| 262 | case 51121: |
| 263 | avctx->pix_fmt = AV_PIX_FMT_GBRP12; |
| 264 | break; |
| 265 | case 6161: |
| 266 | avctx->pix_fmt = AV_PIX_FMT_GRAY16BE; |
| 267 | break; |
| 268 | case 6160: |
| 269 | avctx->pix_fmt = AV_PIX_FMT_GRAY16LE; |
| 270 | break; |
| 271 | case 50161: |
| 272 | avctx->pix_fmt = AV_PIX_FMT_RGB48BE; |
| 273 | break; |
| 274 | case 50160: |
| 275 | avctx->pix_fmt = AV_PIX_FMT_RGB48LE; |
| 276 | break; |
| 277 | case 51161: |
| 278 | avctx->pix_fmt = AV_PIX_FMT_RGBA64BE; |
| 279 | break; |
| 280 | case 51160: |
| 281 | avctx->pix_fmt = AV_PIX_FMT_RGBA64LE; |
| 282 | break; |
| 283 | default: |
| 284 | av_log(avctx, AV_LOG_ERROR, "Unsupported format\n"); |
| 285 | return AVERROR_PATCHWELCOME; |
| 286 | } |
| 287 | |
| 288 | ff_set_sar(avctx, avctx->sample_aspect_ratio); |
| 289 | |
| 290 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 291 | return ret; |
| 292 | |
| 293 | // Move pointer to offset from start of file |
| 294 | buf = avpkt->data + offset; |
| 295 | |
| 296 | for (i=0; i<AV_NUM_DATA_POINTERS; i++) |
| 297 | ptr[i] = p->data[i]; |
| 298 | |
| 299 | switch (bits_per_color) { |
| 300 | case 10: |
| 301 | for (x = 0; x < avctx->height; x++) { |
| 302 | uint16_t *dst[3] = {(uint16_t*)ptr[0], |
| 303 | (uint16_t*)ptr[1], |
| 304 | (uint16_t*)ptr[2]}; |
| 305 | for (y = 0; y < avctx->width; y++) { |
| 306 | *dst[2]++ = read10in32(&buf, &rgbBuffer, |
| 307 | &n_datum, endian); |
| 308 | *dst[0]++ = read10in32(&buf, &rgbBuffer, |
| 309 | &n_datum, endian); |
| 310 | *dst[1]++ = read10in32(&buf, &rgbBuffer, |
| 311 | &n_datum, endian); |
| 312 | // For 10 bit, ignore alpha |
| 313 | if (elements == 4) |
| 314 | read10in32(&buf, &rgbBuffer, |
| 315 | &n_datum, endian); |
| 316 | } |
| 317 | n_datum = 0; |
| 318 | for (i = 0; i < 3; i++) |
| 319 | ptr[i] += p->linesize[i]; |
| 320 | } |
| 321 | break; |
| 322 | case 12: |
| 323 | for (x = 0; x < avctx->height; x++) { |
| 324 | uint16_t *dst[3] = {(uint16_t*)ptr[0], |
| 325 | (uint16_t*)ptr[1], |
| 326 | (uint16_t*)ptr[2]}; |
| 327 | for (y = 0; y < avctx->width; y++) { |
| 328 | *dst[2] = read16(&buf, endian) >> 4; |
| 329 | dst[2]++; |
| 330 | *dst[0] = read16(&buf, endian) >> 4; |
| 331 | dst[0]++; |
| 332 | *dst[1] = read16(&buf, endian) >> 4; |
| 333 | dst[1]++; |
| 334 | // For 12 bit, ignore alpha |
| 335 | if (elements == 4) |
| 336 | buf += 2; |
| 337 | // Jump to next aligned position |
| 338 | buf += need_align; |
| 339 | } |
| 340 | for (i = 0; i < 3; i++) |
| 341 | ptr[i] += p->linesize[i]; |
| 342 | } |
| 343 | break; |
| 344 | case 16: |
| 345 | elements *= 2; |
| 346 | case 8: |
| 347 | av_image_copy_plane(ptr[0], p->linesize[0], |
| 348 | buf, stride, |
| 349 | elements * avctx->width, avctx->height); |
| 350 | break; |
| 351 | } |
| 352 | |
| 353 | *got_frame = 1; |
| 354 | |
| 355 | return buf_size; |
| 356 | } |
| 357 | |
| 358 | AVCodec ff_dpx_decoder = { |
| 359 | .name = "dpx", |
| 360 | .long_name = NULL_IF_CONFIG_SMALL("DPX (Digital Picture Exchange) image"), |
| 361 | .type = AVMEDIA_TYPE_VIDEO, |
| 362 | .id = AV_CODEC_ID_DPX, |
| 363 | .decode = decode_frame, |
| 364 | .capabilities = CODEC_CAP_DR1, |
| 365 | }; |