2 * DPX (.dpx) image decoder
3 * Copyright (c) 2009 Jimmy Christensen
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/intfloat.h"
24 #include "libavutil/imgutils.h"
25 #include "bytestream.h"
29 static unsigned int read16(const uint8_t **ptr, int is_big)
41 static unsigned int read32(const uint8_t **ptr, int is_big)
53 static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
54 int * n_datum, int is_big, int shift)
59 *lbuf = read32(ptr, is_big);
63 *lbuf = *lbuf << 10 | *lbuf >> shift & 0x3FFFFF;
68 static uint16_t read12in32(const uint8_t **ptr, uint32_t * lbuf,
69 int * n_datum, int is_big)
74 *lbuf = read32(ptr, is_big);
79 case 7: return *lbuf & 0xFFF;
80 case 6: return (*lbuf >> 12) & 0xFFF;
82 uint32_t c = *lbuf >> 24;
83 *lbuf = read32(ptr, is_big);
87 case 4: return (*lbuf >> 4) & 0xFFF;
88 case 3: return (*lbuf >> 16) & 0xFFF;
90 uint32_t c = *lbuf >> 28;
91 *lbuf = read32(ptr, is_big);
95 case 1: return (*lbuf >> 8) & 0xFFF;
96 default: return *lbuf >> 20;
100 static int decode_frame(AVCodecContext *avctx,
105 const uint8_t *buf = avpkt->data;
106 int buf_size = avpkt->size;
107 AVFrame *const p = data;
108 uint8_t *ptr[AV_NUM_DATA_POINTERS];
109 uint32_t header_version, version = 0;
112 int magic_num, endian;
113 int x, y, stride, i, ret;
114 int w, h, bits_per_color, descriptor, elements, packing;
115 int encoding, need_align = 0;
117 unsigned int rgbBuffer = 0;
120 if (avpkt->size <= 1634) {
121 av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
122 return AVERROR_INVALIDDATA;
125 magic_num = AV_RB32(buf);
128 /* Check if the files "magic number" is "SDPX" which means it uses
129 * big-endian or XPDS which is for little-endian files */
130 if (magic_num == AV_RL32("SDPX")) {
132 } else if (magic_num == AV_RB32("SDPX")) {
135 av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
136 return AVERROR_INVALIDDATA;
139 offset = read32(&buf, endian);
140 if (avpkt->size <= offset) {
141 av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
142 return AVERROR_INVALIDDATA;
145 header_version = read32(&buf, 0);
146 if (header_version == MKTAG('V','1','.','0'))
148 if (header_version == MKTAG('V','2','.','0'))
151 av_log(avctx, AV_LOG_WARNING, "Unknown header format version %s.\n",
152 av_fourcc2str(header_version));
155 buf = avpkt->data + 660;
156 ret = read32(&buf, endian);
157 if (ret != 0xFFFFFFFF) {
158 avpriv_report_missing_feature(avctx, "Encryption");
159 av_log(avctx, AV_LOG_WARNING, "The image is encrypted and may "
160 "not properly decode.\n");
163 // Need to end in 0x304 offset from start of file
164 buf = avpkt->data + 0x304;
165 w = read32(&buf, endian);
166 h = read32(&buf, endian);
168 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
171 // Need to end in 0x320 to read the descriptor
175 // Need to end in 0x323 to read the bits per color
177 avctx->bits_per_raw_sample =
178 bits_per_color = buf[0];
180 packing = read16(&buf, endian);
181 encoding = read16(&buf, endian);
184 avpriv_report_missing_feature(avctx, "Encoding %d", encoding);
185 return AVERROR_PATCHWELCOME;
189 avctx->sample_aspect_ratio.num = read32(&buf, endian);
190 avctx->sample_aspect_ratio.den = read32(&buf, endian);
191 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
192 av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
193 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
196 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
198 if (offset >= 1724 + 4) {
199 buf = avpkt->data + 1724;
200 i = read32(&buf, endian);
202 AVRational q = av_d2q(av_int2float(i), 4096);
203 if (q.num > 0 && q.den > 0)
204 avctx->framerate = q;
208 switch (descriptor) {
214 case 103: // UYVA4444
225 avpriv_report_missing_feature(avctx, "Descriptor %d", descriptor);
226 return AVERROR_PATCHWELCOME;
229 switch (bits_per_color) {
231 stride = avctx->width * elements;
235 av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
238 stride = (avctx->width * elements + 2) / 3 * 4;
241 stride = avctx->width * elements;
255 stride = 2 * avctx->width * elements;
260 avpriv_report_missing_feature(avctx, "Depth %d", bits_per_color);
261 return AVERROR_PATCHWELCOME;
263 return AVERROR_INVALIDDATA;
266 // Table 3c: Runs will always break at scan line boundaries. Packing
267 // will always break to the next 32-bit word at scan-line boundaries.
268 // Unfortunately, the encoder produced invalid files, so attempt
270 need_align = FFALIGN(stride, 4);
271 if (need_align*avctx->height + (int64_t)offset > avpkt->size) {
272 // Alignment seems unappliable, try without
273 if (stride*avctx->height + (int64_t)offset > avpkt->size) {
274 av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
275 return AVERROR_INVALIDDATA;
277 av_log(avctx, AV_LOG_INFO, "Decoding DPX without scanline "
282 need_align -= stride;
283 stride = FFALIGN(stride, 4);
286 switch (1000 * descriptor + 10 * bits_per_color + endian) {
289 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
293 avctx->pix_fmt = AV_PIX_FMT_GRAY12;
297 avctx->pix_fmt = AV_PIX_FMT_RGB24;
301 avctx->pix_fmt = AV_PIX_FMT_ABGR;
305 avctx->pix_fmt = AV_PIX_FMT_RGBA;
309 avctx->pix_fmt = AV_PIX_FMT_GBRP10;
313 avctx->pix_fmt = AV_PIX_FMT_GBRAP10;
317 avctx->pix_fmt = AV_PIX_FMT_GBRP12;
321 avctx->pix_fmt = AV_PIX_FMT_GBRAP12;
324 avctx->pix_fmt = AV_PIX_FMT_GRAY10;
327 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
330 avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
333 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
336 avctx->pix_fmt = AV_PIX_FMT_RGB48LE;
339 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
342 avctx->pix_fmt = AV_PIX_FMT_RGBA64LE;
345 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
348 avctx->pix_fmt = AV_PIX_FMT_YUV444P;
351 avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
354 av_log(avctx, AV_LOG_ERROR, "Unsupported format\n");
355 return AVERROR_PATCHWELCOME;
358 ff_set_sar(avctx, avctx->sample_aspect_ratio);
360 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
363 // Move pointer to offset from start of file
364 buf = avpkt->data + offset;
366 for (i=0; i<AV_NUM_DATA_POINTERS; i++)
369 switch (bits_per_color) {
371 for (x = 0; x < avctx->height; x++) {
372 uint16_t *dst[4] = {(uint16_t*)ptr[0],
376 int shift = packing == 1 ? 22 : 20;
377 for (y = 0; y < avctx->width; y++) {
379 *dst[2]++ = read10in32(&buf, &rgbBuffer,
380 &n_datum, endian, shift);
381 *dst[0]++ = read10in32(&buf, &rgbBuffer,
382 &n_datum, endian, shift);
384 *dst[1]++ = read10in32(&buf, &rgbBuffer,
385 &n_datum, endian, shift);
388 read10in32(&buf, &rgbBuffer,
389 &n_datum, endian, shift);
392 for (i = 0; i < elements; i++)
393 ptr[i] += p->linesize[i];
397 for (x = 0; x < avctx->height; x++) {
398 uint16_t *dst[4] = {(uint16_t*)ptr[0],
402 int shift = packing == 1 ? 4 : 0;
403 for (y = 0; y < avctx->width; y++) {
406 *dst[2]++ = read16(&buf, endian) >> shift & 0xFFF;
407 *dst[0]++ = read16(&buf, endian) >> shift & 0xFFF;
409 *dst[1]++ = read16(&buf, endian) >> shift & 0xFFF;
411 *dst[3]++ = read16(&buf, endian) >> shift & 0xFFF;
414 *dst[2]++ = read12in32(&buf, &rgbBuffer,
416 *dst[0]++ = read12in32(&buf, &rgbBuffer,
419 *dst[1]++ = read12in32(&buf, &rgbBuffer,
422 *dst[3]++ = read12in32(&buf, &rgbBuffer,
427 for (i = 0; i < elements; i++)
428 ptr[i] += p->linesize[i];
429 // Jump to next aligned position
436 if ( avctx->pix_fmt == AV_PIX_FMT_YUVA444P
437 || avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
438 for (x = 0; x < avctx->height; x++) {
439 ptr[0] = p->data[0] + x * p->linesize[0];
440 ptr[1] = p->data[1] + x * p->linesize[1];
441 ptr[2] = p->data[2] + x * p->linesize[2];
442 ptr[3] = p->data[3] + x * p->linesize[3];
443 for (y = 0; y < avctx->width; y++) {
447 if (avctx->pix_fmt == AV_PIX_FMT_YUVA444P)
452 av_image_copy_plane(ptr[0], p->linesize[0],
454 elements * avctx->width, avctx->height);
464 AVCodec ff_dpx_decoder = {
466 .long_name = NULL_IF_CONFIG_SMALL("DPX (Digital Picture Exchange) image"),
467 .type = AVMEDIA_TYPE_VIDEO,
468 .id = AV_CODEC_ID_DPX,
469 .decode = decode_frame,
470 .capabilities = AV_CODEC_CAP_DR1,