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/imgutils.h"
24 #include "bytestream.h"
27 typedef struct DPXContext {
32 static unsigned int read32(const uint8_t **ptr, int is_big)
44 static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
45 int * n_datum, int is_big)
50 *lbuf = read32(ptr, is_big);
54 *lbuf = (*lbuf << 10) | (*lbuf >> 22);
59 static int decode_frame(AVCodecContext *avctx,
64 const uint8_t *buf = avpkt->data;
65 int buf_size = avpkt->size;
66 DPXContext *const s = avctx->priv_data;
67 AVFrame *picture = data;
68 AVFrame *const p = &s->picture;
69 uint8_t *ptr[AV_NUM_DATA_POINTERS];
72 int magic_num, endian;
74 int w, h, bits_per_color, descriptor, elements, packing, total_size;
76 unsigned int rgbBuffer = 0;
79 if (avpkt->size <= 1634) {
80 av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
81 return AVERROR_INVALIDDATA;
84 magic_num = AV_RB32(buf);
87 /* Check if the files "magic number" is "SDPX" which means it uses
88 * big-endian or XPDS which is for little-endian files */
89 if (magic_num == AV_RL32("SDPX")) {
91 } else if (magic_num == AV_RB32("SDPX")) {
94 av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
98 offset = read32(&buf, endian);
99 if (avpkt->size <= offset) {
100 av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
101 return AVERROR_INVALIDDATA;
103 // Need to end in 0x304 offset from start of file
104 buf = avpkt->data + 0x304;
105 w = read32(&buf, endian);
106 h = read32(&buf, endian);
108 // Need to end in 0x320 to read the descriptor
112 // Need to end in 0x323 to read the bits per color
114 avctx->bits_per_raw_sample =
115 bits_per_color = buf[0];
117 packing = *((uint16_t*)buf);
120 avctx->sample_aspect_ratio.num = read32(&buf, endian);
121 avctx->sample_aspect_ratio.den = read32(&buf, endian);
122 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
123 av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
124 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
127 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
129 switch (descriptor) {
137 av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
141 switch (bits_per_color) {
144 avctx->pix_fmt = AV_PIX_FMT_RGBA;
146 avctx->pix_fmt = AV_PIX_FMT_RGB24;
148 total_size = avctx->width * avctx->height * elements;
152 av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
155 avctx->pix_fmt = AV_PIX_FMT_GBRP10;
156 total_size = (4 * avctx->width * avctx->height * elements) / 3;
160 av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
164 avctx->pix_fmt = AV_PIX_FMT_GBRP12BE;
166 avctx->pix_fmt = AV_PIX_FMT_GBRP12LE;
168 total_size = 2 * avctx->width * avctx->height * elements;
172 avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGB48BE;
174 avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE;
176 total_size = 2 * avctx->width * avctx->height * elements;
179 av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
183 if (s->picture.data[0])
184 avctx->release_buffer(avctx, &s->picture);
185 if (av_image_check_size(w, h, 0, avctx))
187 if (w != avctx->width || h != avctx->height)
188 avcodec_set_dimensions(avctx, w, h);
189 if (avctx->get_buffer(avctx, p) < 0) {
190 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
194 // Move pointer to offset from start of file
195 buf = avpkt->data + offset;
197 for (i=0; i<AV_NUM_DATA_POINTERS; i++)
200 if (total_size > avpkt->size) {
201 av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
204 switch (bits_per_color) {
206 for (x = 0; x < avctx->height; x++) {
207 uint16_t *dst[3] = {(uint16_t*)ptr[0],
210 for (y = 0; y < avctx->width; y++) {
211 *dst[2]++ = read10in32(&buf, &rgbBuffer,
213 *dst[0]++ = read10in32(&buf, &rgbBuffer,
215 *dst[1]++ = read10in32(&buf, &rgbBuffer,
217 // For 10 bit, ignore alpha
219 read10in32(&buf, &rgbBuffer,
222 for (i = 0; i < 3; i++)
223 ptr[i] += p->linesize[i];
227 for (x = 0; x < avctx->height; x++) {
228 uint16_t *dst[3] = {(uint16_t*)ptr[0],
231 for (y = 0; y < avctx->width; y++) {
232 *dst[2] = *((uint16_t*)buf);
233 *dst[2] = (*dst[2] >> 4) | (*dst[2] << 12);
236 *dst[0] = *((uint16_t*)buf);
237 *dst[0] = (*dst[0] >> 4) | (*dst[0] << 12);
240 *dst[1] = *((uint16_t*)buf);
241 *dst[1] = (*dst[1] >> 4) | (*dst[1] << 12);
244 // For 12 bit, ignore alpha
248 for (i = 0; i < 3; i++)
249 ptr[i] += p->linesize[i];
255 for (x = 0; x < avctx->height; x++) {
256 memcpy(ptr[0], buf, elements*avctx->width);
257 ptr[0] += p->linesize[0];
258 buf += elements*avctx->width;
263 *picture = s->picture;
264 *data_size = sizeof(AVPicture);
269 static av_cold int decode_init(AVCodecContext *avctx)
271 DPXContext *s = avctx->priv_data;
272 avcodec_get_frame_defaults(&s->picture);
273 avctx->coded_frame = &s->picture;
277 static av_cold int decode_end(AVCodecContext *avctx)
279 DPXContext *s = avctx->priv_data;
280 if (s->picture.data[0])
281 avctx->release_buffer(avctx, &s->picture);
286 AVCodec ff_dpx_decoder = {
288 .type = AVMEDIA_TYPE_VIDEO,
289 .id = AV_CODEC_ID_DPX,
290 .priv_data_size = sizeof(DPXContext),
293 .decode = decode_frame,
294 .capabilities = CODEC_CAP_DR1,
295 .long_name = NULL_IF_CONFIG_SMALL("DPX image"),