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e96c3b81ca
The rationale is that you have a packed format in form <greyscale sample> <alpha sample> <greyscale sample> <alpha sample> and shortening greyscale to 'G' might make one thing about Greenscale instead. An alias pixel format and color space name are provided for compatibility.
295 lines
10 KiB
C
295 lines
10 KiB
C
/*
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* BRender PIX (.pix) image decoder
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* Copyright (c) 2012 Aleksi Nurmi
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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/* Tested against samples from I-War / Independence War and Defiance. */
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#define HEADER1_CHUNK 0x03
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#define HEADER2_CHUNK 0x3D
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#define IMAGE_DATA_CHUNK 0x21
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/* In 8-bit colour mode, 256 colours are available at any time. Which 256
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* colours are available is determined by the contents of the hardware palette
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* (or CLUT). In this case, the palette supplied with BRender (std.pal) has
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* been loaded into the CLUT.
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*
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* The 256 colours in std.pal are divided into seven ranges, or `colour ramps'.
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* The first 64 colours represent shades of grey ranging from very dark grey
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* (black) to very light grey (white). The following colours are 32-element
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* ramps for six colours as shown below.
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*/
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static const uint32_t std_pal_table[256] = {
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// gray
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0xFF000000, 0xFF030303, 0xFF060606, 0xFF090909, 0xFF0C0C0C, 0xFF0F0F0F,
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0xFF121212, 0xFF151515, 0xFF181818, 0xFF1B1B1B, 0xFF1E1E1E, 0xFF212121,
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0xFF242424, 0xFF272727, 0xFF2A2A2A, 0xFF2D2D2D, 0xFF313131, 0xFF343434,
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0xFF373737, 0xFF3A3A3A, 0xFF3D3D3D, 0xFF404040, 0xFF434343, 0xFF464646,
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0xFF494949, 0xFF4C4C4C, 0xFF4F4F4F, 0xFF525252, 0xFF555555, 0xFF585858,
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0xFF5B5B5B, 0xFF5E5E5E, 0xFF626262, 0xFF656565, 0xFF686868, 0xFF6B6B6B,
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0xFF6E6E6E, 0xFF717171, 0xFF747474, 0xFF777777, 0xFF7A7A7A, 0xFF7D7D7D,
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0xFF808080, 0xFF838383, 0xFF868686, 0xFF898989, 0xFF8C8C8C, 0xFF8F8F8F,
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0xFF939393, 0xFF999999, 0xFFA0A0A0, 0xFFA7A7A7, 0xFFAEAEAE, 0xFFB4B4B4,
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0xFFBBBBBB, 0xFFC2C2C2, 0xFFC9C9C9, 0xFFCFCFCF, 0xFFD6D6D6, 0xFFDDDDDD,
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0xFFE4E4E4, 0xFFEAEAEA, 0xFFF1F1F1, 0xFFF8F8F8,
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// blue
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0xFF000000, 0xFF020209, 0xFF050513, 0xFF07071D, 0xFF0A0A27, 0xFF0C0C31,
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0xFF0F0F3B, 0xFF111145, 0xFF14144F, 0xFF161659, 0xFF181863, 0xFF1B1B6D,
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0xFF1E1E77, 0xFF202080, 0xFF22228A, 0xFF252594, 0xFF28289E, 0xFF2A2AA8,
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0xFF2D2DB2, 0xFF2F2FBC, 0xFF3131C6, 0xFF3434D0, 0xFF3737DA, 0xFF3939E4,
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0xFF3C3CEE, 0xFF5454F0, 0xFF6C6CF2, 0xFF8585F4, 0xFF9D9DF6, 0xFFB5B5F8,
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0xFFCECEFA, 0xFFE6E6FC,
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// green
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0xFF000000, 0xFF020902, 0xFF051305, 0xFF071D07, 0xFF0A270A, 0xFF0C310C,
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0xFF0F3B0F, 0xFF114511, 0xFF144F14, 0xFF165916, 0xFF186318, 0xFF1B6D1B,
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0xFF1E771E, 0xFF208020, 0xFF228A22, 0xFF259425, 0xFF289E28, 0xFF2AA82A,
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0xFF2DB22D, 0xFF2FBC2F, 0xFF31C631, 0xFF34D034, 0xFF37DA37, 0xFF39E439,
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0xFF3CEE3C, 0xFF54F054, 0xFF6CF26C, 0xFF85F485, 0xFF9DF69D, 0xFFB5F8B5,
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0xFFCEFACE, 0xFFE6FCE6,
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// cyan
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0xFF000000, 0xFF020909, 0xFF051313, 0xFF071D1D, 0xFF0A2727, 0xFF0C3131,
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0xFF0F3B3B, 0xFF114545, 0xFF144F4F, 0xFF165959, 0xFF186363, 0xFF1B6D6D,
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0xFF1E7777, 0xFF208080, 0xFF228A8A, 0xFF259494, 0xFF289E9E, 0xFF2AA8A8,
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0xFF2DB2B2, 0xFF2FBCBC, 0xFF31C6C6, 0xFF34D0D0, 0xFF37DADA, 0xFF39E4E4,
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0xFF3CEEEE, 0xFF54F0F0, 0xFF6CF2F2, 0xFF85F4F4, 0xFF9DF6F6, 0xFFB5F8F8,
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0xFFCEFAFA, 0xFFE6FCFC,
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// red
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0xFF000000, 0xFF090202, 0xFF130505, 0xFF1D0707, 0xFF270A0A, 0xFF310C0C,
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0xFF3B0F0F, 0xFF451111, 0xFF4F1414, 0xFF591616, 0xFF631818, 0xFF6D1B1B,
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0xFF771E1E, 0xFF802020, 0xFF8A2222, 0xFF942525, 0xFF9E2828, 0xFFA82A2A,
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0xFFB22D2D, 0xFFBC2F2F, 0xFFC63131, 0xFFD03434, 0xFFDA3737, 0xFFE43939,
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0xFFEE3C3C, 0xFFF05454, 0xFFF26C6C, 0xFFF48585, 0xFFF69D9D, 0xFFF8B5B5,
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0xFFFACECE, 0xFFFCE6E6,
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// magenta
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0xFF000000, 0xFF090209, 0xFF130513, 0xFF1D071D, 0xFF270A27, 0xFF310C31,
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0xFF3B0F3B, 0xFF451145, 0xFF4F144F, 0xFF591659, 0xFF631863, 0xFF6D1B6D,
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0xFF771E77, 0xFF802080, 0xFF8A228A, 0xFF942594, 0xFF9E289E, 0xFFA82AA8,
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0xFFB22DB2, 0xFFBC2FBC, 0xFFC631C6, 0xFFD034D0, 0xFFDA37DA, 0xFFE439E4,
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0xFFEE3CEE, 0xFFF054F0, 0xFFF26CF2, 0xFFF485F4, 0xFFF69DF6, 0xFFF8B5F8,
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0xFFFACEFA, 0xFFFCE6FC,
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// yellow
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0xFF000000, 0xFF090902, 0xFF131305, 0xFF1D1D07, 0xFF27270A, 0xFF31310C,
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0xFF3B3B0F, 0xFF454511, 0xFF4F4F14, 0xFF595916, 0xFF636318, 0xFF6D6D1B,
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0xFF77771E, 0xFF808020, 0xFF8A8A22, 0xFF949425, 0xFF9E9E28, 0xFFA8A82A,
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0xFFB2B22D, 0xFFBCBC2F, 0xFFC6C631, 0xFFD0D034, 0xFFDADA37, 0xFFE4E439,
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0xFFEEEE3C, 0xFFF0F054, 0xFFF2F26C, 0xFFF4F485, 0xFFF6F69D, 0xFFF8F8B5,
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0xFFFAFACE, 0xFFFCFCE6,
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};
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typedef struct PixHeader {
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int width;
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int height;
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int format;
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} PixHeader;
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static int pix_decode_header(PixHeader *out, GetByteContext *pgb)
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{
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unsigned int header_len = bytestream2_get_be32(pgb);
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out->format = bytestream2_get_byte(pgb);
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bytestream2_skip(pgb, 2);
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out->width = bytestream2_get_be16(pgb);
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out->height = bytestream2_get_be16(pgb);
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// the header is at least 11 bytes long; we read the first 7
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if (header_len < 11)
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return AVERROR_INVALIDDATA;
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// skip the rest of the header
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bytestream2_skip(pgb, header_len - 7);
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return 0;
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}
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static int pix_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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AVFrame *frame = data;
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int ret, i, j;
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GetByteContext gb;
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unsigned int bytes_pp;
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unsigned int magic[4];
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unsigned int chunk_type;
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unsigned int data_len;
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unsigned int bytes_per_scanline;
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PixHeader hdr;
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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magic[0] = bytestream2_get_be32(&gb);
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magic[1] = bytestream2_get_be32(&gb);
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magic[2] = bytestream2_get_be32(&gb);
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magic[3] = bytestream2_get_be32(&gb);
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if (magic[0] != 0x12 ||
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magic[1] != 0x08 ||
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magic[2] != 0x02 ||
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magic[3] != 0x02) {
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av_log(avctx, AV_LOG_ERROR, "Not a BRender PIX file.\n");
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return AVERROR_INVALIDDATA;
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}
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chunk_type = bytestream2_get_be32(&gb);
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if (chunk_type != HEADER1_CHUNK && chunk_type != HEADER2_CHUNK) {
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av_log(avctx, AV_LOG_ERROR, "Invalid chunk type %d.\n", chunk_type);
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return AVERROR_INVALIDDATA;
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}
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ret = pix_decode_header(&hdr, &gb);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid header length.\n");
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return AVERROR_INVALIDDATA;
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}
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switch (hdr.format) {
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case 3:
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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bytes_pp = 1;
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break;
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case 4:
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avctx->pix_fmt = AV_PIX_FMT_RGB555BE;
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bytes_pp = 2;
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break;
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case 5:
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avctx->pix_fmt = AV_PIX_FMT_RGB565BE;
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bytes_pp = 2;
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break;
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case 6:
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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bytes_pp = 3;
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break;
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case 7: // XRGB
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case 8: // ARGB
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avctx->pix_fmt = AV_PIX_FMT_ARGB;
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bytes_pp = 4;
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break;
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case 18:
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avctx->pix_fmt = AV_PIX_FMT_YA8;
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bytes_pp = 2;
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break;
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default:
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avpriv_request_sample(avctx, "Format %d", hdr.format);
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return AVERROR_PATCHWELCOME;
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}
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if ((ret = ff_set_dimensions(avctx, hdr.width, hdr.height)) < 0)
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return ret;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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chunk_type = bytestream2_get_be32(&gb);
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
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(chunk_type == HEADER1_CHUNK ||
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chunk_type == HEADER2_CHUNK)) {
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/* read palette data from data[1] */
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PixHeader palhdr;
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uint32_t *pal_out = (uint32_t *)frame->data[1];
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ret = pix_decode_header(&palhdr, &gb);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid palette header length.\n");
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return AVERROR_INVALIDDATA;
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}
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if (palhdr.format != 7)
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avpriv_request_sample(avctx, "Palette not in RGB format");
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chunk_type = bytestream2_get_be32(&gb);
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data_len = bytestream2_get_be32(&gb);
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if (chunk_type != IMAGE_DATA_CHUNK ||
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bytestream2_get_bytes_left(&gb) < data_len) {
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av_log(avctx, AV_LOG_ERROR, "Invalid palette data.\n");
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return AVERROR_INVALIDDATA;
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}
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// palette data is surrounded by 8 null bytes (both top and bottom)
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bytestream2_skip(&gb, 8);
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// convert to machine endian format (ARGB)
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for (i = 0; i < 256; ++i)
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*pal_out++ = (0xFFU << 24) | bytestream2_get_be32u(&gb);
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bytestream2_skip(&gb, 8);
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frame->palette_has_changed = 1;
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chunk_type = bytestream2_get_be32(&gb);
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} else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
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/* no palette supplied, use the default one */
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uint32_t *pal_out = (uint32_t *)frame->data[1];
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// TODO: add an AVOption to load custom palette files
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av_log(avctx, AV_LOG_WARNING,
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"Using default palette, colors might be off.\n");
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memcpy(pal_out, std_pal_table, sizeof(uint32_t) * 256);
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frame->palette_has_changed = 1;
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}
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data_len = bytestream2_get_be32(&gb);
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bytestream2_skip(&gb, 8);
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// read the image data to the buffer
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bytes_per_scanline = bytes_pp * hdr.width;
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if (chunk_type != IMAGE_DATA_CHUNK ||
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data_len < bytes_per_scanline * hdr.height ||
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bytestream2_get_bytes_left(&gb) < data_len) {
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av_log(avctx, AV_LOG_ERROR, "Invalid image data.\n");
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return AVERROR_INVALIDDATA;
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}
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av_image_copy_plane(frame->data[0], frame->linesize[0],
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avpkt->data + bytestream2_tell(&gb),
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bytes_per_scanline,
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bytes_per_scanline, hdr.height);
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// make alpha opaque for XRGB
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if (hdr.format == 7)
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for (j = 0; j < frame->height; j++)
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for (i = 0; i < frame->linesize[0]; i += 4)
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frame->data[0][j * frame->linesize[0] + i] = 0xFF;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_brender_pix_decoder = {
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.name = "brender_pix",
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.long_name = NULL_IF_CONFIG_SMALL("BRender PIX image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_BRENDER_PIX,
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.decode = pix_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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