mirror of
https://github.com/FFmpeg/FFmpeg.git
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229 lines
6.4 KiB
C
229 lines
6.4 KiB
C
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/*
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* DPX (.dpx) image decoder
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* Copyright (c) 2009 Jimmy Christensen
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "bytestream.h"
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#include "avcodec.h"
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typedef struct DPXContext {
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AVFrame picture;
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} DPXContext;
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static unsigned int read32(const uint8_t **ptr, int is_big)
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{
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unsigned int temp;
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if (is_big) {
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temp = AV_RB32(*ptr);
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} else {
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temp = AV_RL32(*ptr);
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}
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*ptr += 4;
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return temp;
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}
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static inline unsigned make_16bit(unsigned value)
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{
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// mask away invalid bits
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value &= 0xFFC0;
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// correctly expand to 16 bits
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return value + (value >> 10);
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data,
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int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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DPXContext *const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame *const p = &s->picture;
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uint8_t *ptr;
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int magic_num, offset, endian;
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int x, y;
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int w, h, stride, bits_per_color, descriptor, elements, target_packet_size, source_packet_size;
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unsigned int rgbBuffer;
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magic_num = AV_RB32(buf);
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buf += 4;
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/* Check if the files "magic number" is "SDPX" which means it uses
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* big-endian or XPDS which is for little-endian files */
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if (magic_num == AV_RL32("SDPX")) {
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endian = 0;
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} else if (magic_num == AV_RB32("SDPX")) {
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endian = 1;
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} else {
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av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
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return -1;
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}
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offset = read32(&buf, endian);
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// Need to end in 0x304 offset from start of file
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buf = avpkt->data + 0x304;
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w = read32(&buf, endian);
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h = read32(&buf, endian);
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// Need to end in 0x320 to read the descriptor
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buf += 20;
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descriptor = buf[0];
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// Need to end in 0x323 to read the bits per color
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buf += 3;
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bits_per_color = buf[0];
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switch (descriptor) {
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case 51: // RGBA
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elements = 4;
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break;
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case 50: // RGB
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elements = 3;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
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return -1;
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}
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switch (bits_per_color) {
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case 8:
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if (elements == 4) {
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avctx->pix_fmt = PIX_FMT_RGBA;
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} else {
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avctx->pix_fmt = PIX_FMT_RGB24;
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}
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source_packet_size = elements;
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target_packet_size = elements;
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break;
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case 10:
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avctx->pix_fmt = PIX_FMT_RGB48;
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target_packet_size = 6;
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source_packet_size = elements * 2;
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break;
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case 12:
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case 16:
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if (endian) {
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avctx->pix_fmt = PIX_FMT_RGB48BE;
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} else {
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avctx->pix_fmt = PIX_FMT_RGB48LE;
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}
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target_packet_size = 6;
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source_packet_size = elements * 2;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
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return -1;
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}
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if (s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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if (avcodec_check_dimensions(avctx, w, h))
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return -1;
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if (w != avctx->width || h != avctx->height)
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avcodec_set_dimensions(avctx, w, h);
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if (avctx->get_buffer(avctx, p) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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// Move pointer to offset from start of file
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buf = avpkt->data + offset;
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ptr = p->data[0];
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stride = p->linesize[0];
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switch (bits_per_color) {
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case 10:
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for (x = 0; x < avctx->height; x++) {
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uint16_t *dst = (uint16_t*)ptr;
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for (y = 0; y < avctx->width; y++) {
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rgbBuffer = read32(&buf, endian);
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// Read out the 10-bit colors and convert to 16-bit
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*dst++ = make_16bit(rgbBuffer >> 16);
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*dst++ = make_16bit(rgbBuffer >> 6);
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*dst++ = make_16bit(rgbBuffer << 4);
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}
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ptr += stride;
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}
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break;
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case 8:
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case 12: // Treat 12-bit as 16-bit
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case 16:
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if (source_packet_size == target_packet_size) {
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for (x = 0; x < avctx->height; x++) {
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memcpy(ptr, buf, target_packet_size*avctx->width);
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ptr += stride;
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buf += source_packet_size*avctx->width;
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}
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} else {
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for (x = 0; x < avctx->height; x++) {
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uint8_t *dst = ptr;
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for (y = 0; y < avctx->width; y++) {
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memcpy(dst, buf, target_packet_size);
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dst += target_packet_size;
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buf += source_packet_size;
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}
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ptr += stride;
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}
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}
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break;
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}
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*picture = s->picture;
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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DPXContext *s = avctx->priv_data;
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avcodec_get_frame_defaults(&s->picture);
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avctx->coded_frame = &s->picture;
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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DPXContext *s = avctx->priv_data;
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if (s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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return 0;
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}
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AVCodec dpx_decoder = {
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"dpx",
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CODEC_TYPE_VIDEO,
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CODEC_ID_DPX,
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sizeof(DPXContext),
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decode_init,
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NULL,
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decode_end,
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decode_frame,
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0,
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NULL,
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.long_name = NULL_IF_CONFIG_SMALL("DPX image"),
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};
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