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"
28 typedef struct DPXContext {
33 static unsigned int read32(const uint8_t **ptr, int is_big)
45 static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
46 int * n_datum, int is_big)
51 *lbuf = read32(ptr, is_big);
55 *lbuf = (*lbuf << 10) | (*lbuf >> 22);
60 static int decode_frame(AVCodecContext *avctx,
65 const uint8_t *buf = avpkt->data;
66 int buf_size = avpkt->size;
67 DPXContext *const s = avctx->priv_data;
68 AVFrame *picture = data;
69 AVFrame *const p = &s->picture;
70 uint8_t *ptr[AV_NUM_DATA_POINTERS];
73 int magic_num, endian;
75 int w, h, bits_per_color, descriptor, elements, packing, total_size;
77 unsigned int rgbBuffer = 0;
80 if (avpkt->size <= 1634) {
81 av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
82 return AVERROR_INVALIDDATA;
85 magic_num = AV_RB32(buf);
88 /* Check if the files "magic number" is "SDPX" which means it uses
89 * big-endian or XPDS which is for little-endian files */
90 if (magic_num == AV_RL32("SDPX")) {
92 } else if (magic_num == AV_RB32("SDPX")) {
95 av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
96 return AVERROR_INVALIDDATA;
99 offset = read32(&buf, endian);
100 if (avpkt->size <= offset) {
101 av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
102 return AVERROR_INVALIDDATA;
104 // Need to end in 0x304 offset from start of file
105 buf = avpkt->data + 0x304;
106 w = read32(&buf, endian);
107 h = read32(&buf, endian);
108 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
111 if (w != avctx->width || h != avctx->height)
112 avcodec_set_dimensions(avctx, w, h);
114 // Need to end in 0x320 to read the descriptor
118 // Need to end in 0x323 to read the bits per color
120 avctx->bits_per_raw_sample =
121 bits_per_color = buf[0];
123 packing = *((uint16_t*)buf);
126 avctx->sample_aspect_ratio.num = read32(&buf, endian);
127 avctx->sample_aspect_ratio.den = read32(&buf, endian);
128 if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
129 av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
130 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
133 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
135 switch (descriptor) {
143 av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
144 return AVERROR_INVALIDDATA;
147 switch (bits_per_color) {
150 avctx->pix_fmt = AV_PIX_FMT_RGBA;
152 avctx->pix_fmt = AV_PIX_FMT_RGB24;
154 total_size = avctx->width * avctx->height * elements;
158 av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
161 avctx->pix_fmt = AV_PIX_FMT_GBRP10;
162 total_size = (4 * avctx->width * avctx->height * elements) / 3;
166 av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
170 avctx->pix_fmt = AV_PIX_FMT_GBRP12BE;
172 avctx->pix_fmt = AV_PIX_FMT_GBRP12LE;
174 total_size = 2 * avctx->width * avctx->height * elements;
178 avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGB48BE;
180 avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE;
182 total_size = 2 * avctx->width * avctx->height * elements;
185 av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
186 return AVERROR_INVALIDDATA;
189 if (s->picture.data[0])
190 avctx->release_buffer(avctx, &s->picture);
191 if ((ret = ff_get_buffer(avctx, p)) < 0) {
192 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
196 // Move pointer to offset from start of file
197 buf = avpkt->data + offset;
199 for (i=0; i<AV_NUM_DATA_POINTERS; i++)
202 if (total_size > avpkt->size) {
203 av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
204 return AVERROR_INVALIDDATA;
206 switch (bits_per_color) {
208 for (x = 0; x < avctx->height; x++) {
209 uint16_t *dst[3] = {(uint16_t*)ptr[0],
212 for (y = 0; y < avctx->width; y++) {
213 *dst[2]++ = read10in32(&buf, &rgbBuffer,
215 *dst[0]++ = read10in32(&buf, &rgbBuffer,
217 *dst[1]++ = read10in32(&buf, &rgbBuffer,
219 // For 10 bit, ignore alpha
221 read10in32(&buf, &rgbBuffer,
224 for (i = 0; i < 3; i++)
225 ptr[i] += p->linesize[i];
229 for (x = 0; x < avctx->height; x++) {
230 uint16_t *dst[3] = {(uint16_t*)ptr[0],
233 for (y = 0; y < avctx->width; y++) {
234 *dst[2] = *((uint16_t*)buf);
235 *dst[2] = (*dst[2] >> 4) | (*dst[2] << 12);
238 *dst[0] = *((uint16_t*)buf);
239 *dst[0] = (*dst[0] >> 4) | (*dst[0] << 12);
242 *dst[1] = *((uint16_t*)buf);
243 *dst[1] = (*dst[1] >> 4) | (*dst[1] << 12);
246 // For 12 bit, ignore alpha
250 for (i = 0; i < 3; i++)
251 ptr[i] += p->linesize[i];
257 for (x = 0; x < avctx->height; x++) {
258 memcpy(ptr[0], buf, elements*avctx->width);
259 ptr[0] += p->linesize[0];
260 buf += elements*avctx->width;
265 *picture = s->picture;
271 static av_cold int decode_init(AVCodecContext *avctx)
273 DPXContext *s = avctx->priv_data;
274 avcodec_get_frame_defaults(&s->picture);
275 avctx->coded_frame = &s->picture;
279 static av_cold int decode_end(AVCodecContext *avctx)
281 DPXContext *s = avctx->priv_data;
282 if (s->picture.data[0])
283 avctx->release_buffer(avctx, &s->picture);
288 AVCodec ff_dpx_decoder = {
290 .type = AVMEDIA_TYPE_VIDEO,
291 .id = AV_CODEC_ID_DPX,
292 .priv_data_size = sizeof(DPXContext),
295 .decode = decode_frame,
296 .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
297 .capabilities = CODEC_CAP_DR1,