summaryrefslogtreecommitdiff
path: root/ffmpeg/libavcodec/dpx.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg/libavcodec/dpx.c')
-rw-r--r--ffmpeg/libavcodec/dpx.c266
1 files changed, 266 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/dpx.c b/ffmpeg/libavcodec/dpx.c
new file mode 100644
index 0000000..0d60a7e
--- /dev/null
+++ b/ffmpeg/libavcodec/dpx.c
@@ -0,0 +1,266 @@
+/*
+ * DPX (.dpx) image decoder
+ * Copyright (c) 2009 Jimmy Christensen
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "bytestream.h"
+#include "avcodec.h"
+#include "internal.h"
+
+static unsigned int read32(const uint8_t **ptr, int is_big)
+{
+ unsigned int temp;
+ if (is_big) {
+ temp = AV_RB32(*ptr);
+ } else {
+ temp = AV_RL32(*ptr);
+ }
+ *ptr += 4;
+ return temp;
+}
+
+static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
+ int * n_datum, int is_big)
+{
+ if (*n_datum)
+ (*n_datum)--;
+ else {
+ *lbuf = read32(ptr, is_big);
+ *n_datum = 2;
+ }
+
+ *lbuf = (*lbuf << 10) | (*lbuf >> 22);
+
+ return *lbuf & 0x3FF;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+ void *data,
+ int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ AVFrame *const p = data;
+ uint8_t *ptr[AV_NUM_DATA_POINTERS];
+
+ unsigned int offset;
+ int magic_num, endian;
+ int x, y, i, ret;
+ int w, h, bits_per_color, descriptor, elements, packing, total_size;
+
+ unsigned int rgbBuffer = 0;
+ int n_datum = 0;
+
+ if (avpkt->size <= 1634) {
+ av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ magic_num = AV_RB32(buf);
+ buf += 4;
+
+ /* Check if the files "magic number" is "SDPX" which means it uses
+ * big-endian or XPDS which is for little-endian files */
+ if (magic_num == AV_RL32("SDPX")) {
+ endian = 0;
+ } else if (magic_num == AV_RB32("SDPX")) {
+ endian = 1;
+ } else {
+ av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ offset = read32(&buf, endian);
+ if (avpkt->size <= offset) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
+ return AVERROR_INVALIDDATA;
+ }
+ // Need to end in 0x304 offset from start of file
+ buf = avpkt->data + 0x304;
+ w = read32(&buf, endian);
+ h = read32(&buf, endian);
+ if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
+ return ret;
+
+ if (w != avctx->width || h != avctx->height)
+ avcodec_set_dimensions(avctx, w, h);
+
+ // Need to end in 0x320 to read the descriptor
+ buf += 20;
+ descriptor = buf[0];
+
+ // Need to end in 0x323 to read the bits per color
+ buf += 3;
+ avctx->bits_per_raw_sample =
+ bits_per_color = buf[0];
+ buf++;
+ packing = *((uint16_t*)buf);
+
+ buf += 824;
+ avctx->sample_aspect_ratio.num = read32(&buf, endian);
+ avctx->sample_aspect_ratio.den = read32(&buf, endian);
+ if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
+ av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
+ avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
+ 0x10000);
+ else
+ avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
+
+ switch (descriptor) {
+ case 51: // RGBA
+ elements = 4;
+ break;
+ case 50: // RGB
+ elements = 3;
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
+ return AVERROR_INVALIDDATA;
+ }
+
+ switch (bits_per_color) {
+ case 8:
+ if (elements == 4) {
+ avctx->pix_fmt = AV_PIX_FMT_RGBA;
+ } else {
+ avctx->pix_fmt = AV_PIX_FMT_RGB24;
+ }
+ total_size = avctx->width * avctx->height * elements;
+ break;
+ case 10:
+ if (!packing) {
+ av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
+ return -1;
+ }
+ avctx->pix_fmt = AV_PIX_FMT_GBRP10;
+ total_size = (avctx->width * avctx->height * elements + 2) / 3 * 4;
+ break;
+ case 12:
+ if (!packing) {
+ av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
+ return -1;
+ }
+ if (endian) {
+ avctx->pix_fmt = AV_PIX_FMT_GBRP12BE;
+ } else {
+ avctx->pix_fmt = AV_PIX_FMT_GBRP12LE;
+ }
+ total_size = 2 * avctx->width * avctx->height * elements;
+ break;
+ case 16:
+ if (endian) {
+ avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGB48BE;
+ } else {
+ avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE;
+ }
+ total_size = 2 * avctx->width * avctx->height * elements;
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+ return ret;
+
+ // Move pointer to offset from start of file
+ buf = avpkt->data + offset;
+
+ for (i=0; i<AV_NUM_DATA_POINTERS; i++)
+ ptr[i] = p->data[i];
+
+ if (total_size + (int64_t)offset > avpkt->size) {
+ av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
+ return AVERROR_INVALIDDATA;
+ }
+ switch (bits_per_color) {
+ case 10:
+ for (x = 0; x < avctx->height; x++) {
+ uint16_t *dst[3] = {(uint16_t*)ptr[0],
+ (uint16_t*)ptr[1],
+ (uint16_t*)ptr[2]};
+ for (y = 0; y < avctx->width; y++) {
+ *dst[2]++ = read10in32(&buf, &rgbBuffer,
+ &n_datum, endian);
+ *dst[0]++ = read10in32(&buf, &rgbBuffer,
+ &n_datum, endian);
+ *dst[1]++ = read10in32(&buf, &rgbBuffer,
+ &n_datum, endian);
+ // For 10 bit, ignore alpha
+ if (elements == 4)
+ read10in32(&buf, &rgbBuffer,
+ &n_datum, endian);
+ }
+ for (i = 0; i < 3; i++)
+ ptr[i] += p->linesize[i];
+ }
+ break;
+ case 12:
+ for (x = 0; x < avctx->height; x++) {
+ uint16_t *dst[3] = {(uint16_t*)ptr[0],
+ (uint16_t*)ptr[1],
+ (uint16_t*)ptr[2]};
+ for (y = 0; y < avctx->width; y++) {
+ *dst[2] = *((uint16_t*)buf);
+ *dst[2] = (*dst[2] >> 4) | (*dst[2] << 12);
+ dst[2]++;
+ buf += 2;
+ *dst[0] = *((uint16_t*)buf);
+ *dst[0] = (*dst[0] >> 4) | (*dst[0] << 12);
+ dst[0]++;
+ buf += 2;
+ *dst[1] = *((uint16_t*)buf);
+ *dst[1] = (*dst[1] >> 4) | (*dst[1] << 12);
+ dst[1]++;
+ buf += 2;
+ // For 12 bit, ignore alpha
+ if (elements == 4)
+ buf += 2;
+ }
+ for (i = 0; i < 3; i++)
+ ptr[i] += p->linesize[i];
+ }
+ break;
+ case 16:
+ elements *= 2;
+ case 8:
+ for (x = 0; x < avctx->height; x++) {
+ memcpy(ptr[0], buf, elements*avctx->width);
+ ptr[0] += p->linesize[0];
+ buf += elements*avctx->width;
+ }
+ break;
+ }
+
+ *got_frame = 1;
+
+ return buf_size;
+}
+
+AVCodec ff_dpx_decoder = {
+ .name = "dpx",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_DPX,
+ .decode = decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
+ .capabilities = CODEC_CAP_DR1,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 14:23:18 +0000