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];
111 int magic_num, endian;
112 int x, y, stride, i, ret;
113 int w, h, bits_per_color, descriptor, elements, packing;
114 int encoding, need_align = 0;
116 unsigned int rgbBuffer = 0;
119 if (avpkt->size <= 1634) {
120 av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
121 return AVERROR_INVALIDDATA;
124 magic_num = AV_RB32(buf);
127 /* Check if the files "magic number" is "SDPX" which means it uses
128 * big-endian or XPDS which is for little-endian files */
129 if (magic_num == AV_RL32("SDPX")) {
131 } else if (magic_num == AV_RB32("SDPX")) {
134 av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
135 return AVERROR_INVALIDDATA;
138 offset = read32(&buf, endian);
139 if (avpkt->size <= offset) {
140 av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
141 return AVERROR_INVALIDDATA;
145 buf = avpkt->data + 660;
146 ret = read32(&buf, endian);
147 if (ret != 0xFFFFFFFF) {
148 avpriv_report_missing_feature(avctx, "Encryption");
149 av_log(avctx, AV_LOG_WARNING, "The image is encrypted and may "
150 "not properly decode.\n");
153 // Need to end in 0x304 offset from start of file
154 buf = avpkt->data + 0x304;
155 w = read32(&buf, endian);
156 h = read32(&buf, endian);
158 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
161 // Need to end in 0x320 to read the descriptor
165 // Need to end in 0x323 to read the bits per color
167 avctx->bits_per_raw_sample =
168 bits_per_color = buf[0];
170 packing = read16(&buf, endian);
171 encoding = read16(&buf, endian);
174 avpriv_report_missing_feature(avctx, "Encoding %d", encoding);
175 return AVERROR_PATCHWELCOME;
179 avctx->sample_aspect_ratio.num = read32(&buf, endian);
180 avctx->sample_aspect_ratio.den = read32(&buf, endian);
181 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
182 av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
183 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
186 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
188 if (offset >= 1724 + 4) {
189 buf = avpkt->data + 1724;
190 i = read32(&buf, endian);
192 AVRational q = av_d2q(av_int2float(i), 4096);
193 if (q.num > 0 && q.den > 0)
194 avctx->framerate = q;
198 switch (descriptor) {
204 case 103: // UYVA4444
215 avpriv_report_missing_feature(avctx, "Descriptor %d", descriptor);
216 return AVERROR_PATCHWELCOME;
219 switch (bits_per_color) {
221 stride = avctx->width * elements;
225 av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
228 stride = (avctx->width * elements + 2) / 3 * 4;
231 stride = avctx->width * elements;
245 stride = 2 * avctx->width * elements;
250 avpriv_report_missing_feature(avctx, "Depth %d", bits_per_color);
251 return AVERROR_PATCHWELCOME;
253 return AVERROR_INVALIDDATA;
256 // Table 3c: Runs will always break at scan line boundaries. Packing
257 // will always break to the next 32-bit word at scan-line boundaries.
258 // Unfortunately, the encoder produced invalid files, so attempt
260 need_align = FFALIGN(stride, 4);
261 if (need_align*avctx->height + (int64_t)offset > avpkt->size) {
262 // Alignment seems unappliable, try without
263 if (stride*avctx->height + (int64_t)offset > avpkt->size) {
264 av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
265 return AVERROR_INVALIDDATA;
267 av_log(avctx, AV_LOG_INFO, "Decoding DPX without scanline "
272 need_align -= stride;
273 stride = FFALIGN(stride, 4);
276 switch (1000 * descriptor + 10 * bits_per_color + endian) {
279 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
283 avctx->pix_fmt = AV_PIX_FMT_GRAY12;
287 avctx->pix_fmt = AV_PIX_FMT_RGB24;
291 avctx->pix_fmt = AV_PIX_FMT_ABGR;
295 avctx->pix_fmt = AV_PIX_FMT_RGBA;
299 avctx->pix_fmt = AV_PIX_FMT_GBRP10;
303 avctx->pix_fmt = AV_PIX_FMT_GBRAP10;
307 avctx->pix_fmt = AV_PIX_FMT_GBRP12;
311 avctx->pix_fmt = AV_PIX_FMT_GBRAP12;
314 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
317 avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
320 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
323 avctx->pix_fmt = AV_PIX_FMT_RGB48LE;
326 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
329 avctx->pix_fmt = AV_PIX_FMT_RGBA64LE;
332 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
335 avctx->pix_fmt = AV_PIX_FMT_YUV444P;
338 avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
341 av_log(avctx, AV_LOG_ERROR, "Unsupported format\n");
342 return AVERROR_PATCHWELCOME;
345 ff_set_sar(avctx, avctx->sample_aspect_ratio);
347 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
350 // Move pointer to offset from start of file
351 buf = avpkt->data + offset;
353 for (i=0; i<AV_NUM_DATA_POINTERS; i++)
356 switch (bits_per_color) {
358 for (x = 0; x < avctx->height; x++) {
359 uint16_t *dst[4] = {(uint16_t*)ptr[0],
363 int shift = packing == 1 ? 22 : 20;
364 for (y = 0; y < avctx->width; y++) {
365 *dst[2]++ = read10in32(&buf, &rgbBuffer,
366 &n_datum, endian, shift);
367 *dst[0]++ = read10in32(&buf, &rgbBuffer,
368 &n_datum, endian, shift);
369 *dst[1]++ = read10in32(&buf, &rgbBuffer,
370 &n_datum, endian, shift);
373 read10in32(&buf, &rgbBuffer,
374 &n_datum, endian, shift);
377 for (i = 0; i < elements; i++)
378 ptr[i] += p->linesize[i];
382 for (x = 0; x < avctx->height; x++) {
383 uint16_t *dst[4] = {(uint16_t*)ptr[0],
387 int shift = packing == 1 ? 4 : 0;
388 for (y = 0; y < avctx->width; y++) {
391 *dst[2]++ = read16(&buf, endian) >> shift & 0xFFF;
392 *dst[0]++ = read16(&buf, endian) >> shift & 0xFFF;
394 *dst[1]++ = read16(&buf, endian) >> shift & 0xFFF;
396 *dst[3]++ = read16(&buf, endian) >> shift & 0xFFF;
399 *dst[2]++ = read12in32(&buf, &rgbBuffer,
401 *dst[0]++ = read12in32(&buf, &rgbBuffer,
404 *dst[1]++ = read12in32(&buf, &rgbBuffer,
407 *dst[3]++ = read12in32(&buf, &rgbBuffer,
412 for (i = 0; i < elements; i++)
413 ptr[i] += p->linesize[i];
414 // Jump to next aligned position
421 if ( avctx->pix_fmt == AV_PIX_FMT_YUVA444P
422 || avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
423 for (x = 0; x < avctx->height; x++) {
424 ptr[0] = p->data[0] + x * p->linesize[0];
425 ptr[1] = p->data[1] + x * p->linesize[1];
426 ptr[2] = p->data[2] + x * p->linesize[2];
427 ptr[3] = p->data[3] + x * p->linesize[3];
428 for (y = 0; y < avctx->width; y++) {
432 if (avctx->pix_fmt == AV_PIX_FMT_YUVA444P)
437 av_image_copy_plane(ptr[0], p->linesize[0],
439 elements * avctx->width, avctx->height);
449 AVCodec ff_dpx_decoder = {
451 .long_name = NULL_IF_CONFIG_SMALL("DPX (Digital Picture Exchange) image"),
452 .type = AVMEDIA_TYPE_VIDEO,
453 .id = AV_CODEC_ID_DPX,
454 .decode = decode_frame,
455 .capabilities = AV_CODEC_CAP_DR1,