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 int decode_frame(AVCodecContext *avctx,
49 const uint8_t *buf = avpkt->data;
50 const uint8_t *buf_end = avpkt->data + avpkt->size;
51 int buf_size = avpkt->size;
52 DPXContext *const s = avctx->priv_data;
53 AVFrame *picture = data;
54 AVFrame *const p = &s->picture;
55 uint8_t *ptr[AV_NUM_DATA_POINTERS];
58 int magic_num, endian;
60 int w, h, stride, bits_per_color, descriptor, elements, target_packet_size, source_packet_size;
63 unsigned int rgbBuffer;
65 if (avpkt->size <= 1634) {
66 av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
67 return AVERROR_INVALIDDATA;
70 magic_num = AV_RB32(buf);
73 /* Check if the files "magic number" is "SDPX" which means it uses
74 * big-endian or XPDS which is for little-endian files */
75 if (magic_num == AV_RL32("SDPX")) {
77 } else if (magic_num == AV_RB32("SDPX")) {
80 av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
84 offset = read32(&buf, endian);
85 if (avpkt->size <= offset) {
86 av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
87 return AVERROR_INVALIDDATA;
89 // Need to end in 0x304 offset from start of file
90 buf = avpkt->data + 0x304;
91 w = read32(&buf, endian);
92 h = read32(&buf, endian);
94 // Need to end in 0x320 to read the descriptor
98 // Need to end in 0x323 to read the bits per color
100 avctx->bits_per_raw_sample =
101 bits_per_color = buf[0];
104 avctx->sample_aspect_ratio.num = read32(&buf, endian);
105 avctx->sample_aspect_ratio.den = read32(&buf, endian);
106 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
107 av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
108 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
111 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
113 switch (descriptor) {
121 av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
125 switch (bits_per_color) {
128 avctx->pix_fmt = PIX_FMT_RGBA;
130 avctx->pix_fmt = PIX_FMT_RGB24;
132 source_packet_size = elements;
133 target_packet_size = elements;
137 avctx->pix_fmt = PIX_FMT_GBRP10;
138 target_packet_size = 6;
139 source_packet_size = 4;
144 avctx->pix_fmt = elements == 4 ? PIX_FMT_GBRP12BE : PIX_FMT_GBRP12BE;
146 avctx->pix_fmt = elements == 4 ? PIX_FMT_GBRP12LE : PIX_FMT_GBRP12LE;
148 target_packet_size = 6;
149 source_packet_size = 6;
154 avctx->pix_fmt = elements == 4 ? PIX_FMT_RGBA64BE : PIX_FMT_RGB48BE;
156 avctx->pix_fmt = elements == 4 ? PIX_FMT_RGBA64LE : PIX_FMT_RGB48LE;
159 source_packet_size = elements * 2;
163 av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
167 if (s->picture.data[0])
168 avctx->release_buffer(avctx, &s->picture);
169 if (av_image_check_size(w, h, 0, avctx))
171 if (w != avctx->width || h != avctx->height)
172 avcodec_set_dimensions(avctx, w, h);
173 if (avctx->get_buffer(avctx, p) < 0) {
174 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
178 // Move pointer to offset from start of file
179 buf = avpkt->data + offset;
181 for (i=0; i<AV_NUM_DATA_POINTERS; i++)
183 stride = p->linesize[0];
185 if (source_packet_size*avctx->width*avctx->height > buf_end - buf) {
186 av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
189 switch (bits_per_color) {
191 for (x = 0; x < avctx->height; x++) {
192 uint16_t *dst[3] = {(uint16_t*)ptr[0],
195 for (y = 0; y < avctx->width; y++) {
196 rgbBuffer = read32(&buf, endian);
197 *dst[0]++ = (rgbBuffer >> 12) & 0x3FF;
198 *dst[1]++ = (rgbBuffer >> 2) & 0x3FF;
199 *dst[2]++ = (rgbBuffer >> 22) & 0x3FF;
202 ptr[i] += p->linesize[i];
209 int source_bpc = target_packet_size / elements;
210 int target_bpc = target_packet_size / elements;
211 for (x = 0; x < avctx->height; x++) {
212 uint8_t *dst[AV_NUM_DATA_POINTERS];
213 for (i=0; i<elements; i++)
215 for (y = 0; y < avctx->width; y++) {
216 for (i=0; i<3; i++) {
217 memcpy(dst[i], buf, FFMIN(source_bpc, target_bpc));
218 dst[i] += target_bpc;
222 for (i=0; i<elements; i++)
223 ptr[i] += p->linesize[i];
226 if (source_packet_size == target_packet_size) {
227 for (x = 0; x < avctx->height; x++) {
228 memcpy(ptr[0], buf, target_packet_size*avctx->width);
230 buf += source_packet_size*avctx->width;
233 for (x = 0; x < avctx->height; x++) {
234 uint8_t *dst = ptr[0];
235 for (y = 0; y < avctx->width; y++) {
236 memcpy(dst, buf, target_packet_size);
237 dst += target_packet_size;
238 buf += source_packet_size;
247 *picture = s->picture;
248 *data_size = sizeof(AVPicture);
253 static av_cold int decode_init(AVCodecContext *avctx)
255 DPXContext *s = avctx->priv_data;
256 avcodec_get_frame_defaults(&s->picture);
257 avctx->coded_frame = &s->picture;
261 static av_cold int decode_end(AVCodecContext *avctx)
263 DPXContext *s = avctx->priv_data;
264 if (s->picture.data[0])
265 avctx->release_buffer(avctx, &s->picture);
270 AVCodec ff_dpx_decoder = {
272 .type = AVMEDIA_TYPE_VIDEO,
273 .id = AV_CODEC_ID_DPX,
274 .priv_data_size = sizeof(DPXContext),
277 .decode = decode_frame,
278 .capabilities = CODEC_CAP_DR1,
279 .long_name = NULL_IF_CONFIG_SMALL("DPX image"),