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 "bytestream.h"
26 typedef struct DPXContext {
31 static unsigned int read32(const uint8_t **ptr, int is_big)
43 static inline unsigned make_16bit(unsigned value)
45 // mask away invalid bits
47 // correctly expand to 16 bits
48 return value + (value >> 10);
51 static int decode_frame(AVCodecContext *avctx,
56 const uint8_t *buf = avpkt->data;
57 int buf_size = avpkt->size;
58 DPXContext *const s = avctx->priv_data;
59 AVFrame *picture = data;
60 AVFrame *const p = &s->picture;
63 int magic_num, offset, endian;
65 int w, h, stride, bits_per_color, descriptor, elements, target_packet_size, source_packet_size;
67 unsigned int rgbBuffer;
69 magic_num = AV_RB32(buf);
72 /* Check if the files "magic number" is "SDPX" which means it uses
73 * big-endian or XPDS which is for little-endian files */
74 if (magic_num == AV_RL32("SDPX")) {
76 } else if (magic_num == AV_RB32("SDPX")) {
79 av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
83 offset = read32(&buf, endian);
84 // Need to end in 0x304 offset from start of file
85 buf = avpkt->data + 0x304;
86 w = read32(&buf, endian);
87 h = read32(&buf, endian);
89 // Need to end in 0x320 to read the descriptor
93 // Need to end in 0x323 to read the bits per color
95 bits_per_color = buf[0];
105 av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
109 switch (bits_per_color) {
112 avctx->pix_fmt = PIX_FMT_RGBA;
114 avctx->pix_fmt = PIX_FMT_RGB24;
116 source_packet_size = elements;
117 target_packet_size = elements;
120 avctx->pix_fmt = PIX_FMT_RGB48;
121 target_packet_size = 6;
122 source_packet_size = elements * 2;
127 avctx->pix_fmt = PIX_FMT_RGB48BE;
129 avctx->pix_fmt = PIX_FMT_RGB48LE;
131 target_packet_size = 6;
132 source_packet_size = elements * 2;
135 av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
139 if (s->picture.data[0])
140 avctx->release_buffer(avctx, &s->picture);
141 if (avcodec_check_dimensions(avctx, w, h))
143 if (w != avctx->width || h != avctx->height)
144 avcodec_set_dimensions(avctx, w, h);
145 if (avctx->get_buffer(avctx, p) < 0) {
146 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
150 // Move pointer to offset from start of file
151 buf = avpkt->data + offset;
154 stride = p->linesize[0];
156 switch (bits_per_color) {
158 for (x = 0; x < avctx->height; x++) {
159 uint16_t *dst = (uint16_t*)ptr;
160 for (y = 0; y < avctx->width; y++) {
161 rgbBuffer = read32(&buf, endian);
162 // Read out the 10-bit colors and convert to 16-bit
163 *dst++ = make_16bit(rgbBuffer >> 16);
164 *dst++ = make_16bit(rgbBuffer >> 6);
165 *dst++ = make_16bit(rgbBuffer << 4);
171 case 12: // Treat 12-bit as 16-bit
173 if (source_packet_size == target_packet_size) {
174 for (x = 0; x < avctx->height; x++) {
175 memcpy(ptr, buf, target_packet_size*avctx->width);
177 buf += source_packet_size*avctx->width;
180 for (x = 0; x < avctx->height; x++) {
182 for (y = 0; y < avctx->width; y++) {
183 memcpy(dst, buf, target_packet_size);
184 dst += target_packet_size;
185 buf += source_packet_size;
193 *picture = s->picture;
194 *data_size = sizeof(AVPicture);
199 static av_cold int decode_init(AVCodecContext *avctx)
201 DPXContext *s = avctx->priv_data;
202 avcodec_get_frame_defaults(&s->picture);
203 avctx->coded_frame = &s->picture;
207 static av_cold int decode_end(AVCodecContext *avctx)
209 DPXContext *s = avctx->priv_data;
210 if (s->picture.data[0])
211 avctx->release_buffer(avctx, &s->picture);
216 AVCodec dpx_decoder = {
227 .long_name = NULL_IF_CONFIG_SMALL("DPX image"),