| /* |
| * QuickTime palette handling |
| * Copyright (c) 2001 Fabrice Bellard |
| * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com> |
| * Copyright (c) 2015 Mats Peterson |
| * |
| * 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 <stdio.h> |
| #include <stdint.h> |
| |
| #include "avformat.h" |
| #include "libavutil/intreadwrite.h" |
| #include "qtpalette.h" |
| |
| int ff_get_qtpalette(int codec_id, AVIOContext *pb, uint32_t *palette) |
| { |
| int tmp, bit_depth, color_table_id, greyscale, i; |
| |
| avio_seek(pb, 82, SEEK_CUR); |
| |
| /* Get the bit depth and greyscale state */ |
| tmp = avio_rb16(pb); |
| bit_depth = tmp & 0x1F; |
| greyscale = tmp & 0x20; |
| |
| /* Get the color table ID */ |
| color_table_id = avio_rb16(pb); |
| |
| /* Do not create a greyscale palette for Cinepak */ |
| if (greyscale && codec_id == AV_CODEC_ID_CINEPAK) |
| return 0; |
| |
| /* If the depth is 1, 2, 4, or 8 bpp, file is palettized. */ |
| if ((bit_depth == 1 || bit_depth == 2 || bit_depth == 4 || bit_depth == 8)) { |
| uint32_t color_count, color_start, color_end; |
| uint32_t r, g, b; |
| |
| /* Ignore the greyscale bit for 1-bit video and sample |
| * descriptions containing a color table. */ |
| if (greyscale && bit_depth > 1 && color_table_id) { |
| int color_index, color_dec; |
| /* compute the greyscale palette */ |
| color_count = 1 << bit_depth; |
| color_index = 255; |
| color_dec = 256 / (color_count - 1); |
| for (i = 0; i < color_count; i++) { |
| r = g = b = color_index; |
| palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b); |
| color_index -= color_dec; |
| if (color_index < 0) |
| color_index = 0; |
| } |
| } else if (color_table_id) { |
| /* The color table ID is non-zero. Interpret this as |
| * being -1, which means use the default Macintosh |
| * color table */ |
| const uint8_t *color_table; |
| color_count = 1 << bit_depth; |
| if (bit_depth == 1) |
| color_table = ff_qt_default_palette_2; |
| else if (bit_depth == 2) |
| color_table = ff_qt_default_palette_4; |
| else if (bit_depth == 4) |
| color_table = ff_qt_default_palette_16; |
| else |
| color_table = ff_qt_default_palette_256; |
| for (i = 0; i < color_count; i++) { |
| r = color_table[i * 3 + 0]; |
| g = color_table[i * 3 + 1]; |
| b = color_table[i * 3 + 2]; |
| palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b); |
| } |
| } else { |
| /* The color table ID is 0; the color table is in the sample |
| * description */ |
| color_start = avio_rb32(pb); |
| avio_rb16(pb); /* color table flags */ |
| color_end = avio_rb16(pb); |
| if ((color_start <= 255) && (color_end <= 255)) { |
| for (i = color_start; i <= color_end; i++) { |
| /* Each color is made of four unsigned 16 bit integers. The |
| * first integer is 0, the remaining integers are the red, |
| * the green and the blue values. We only use the top 8 bit. */ |
| avio_skip(pb, 2); |
| r = avio_r8(pb); |
| avio_r8(pb); |
| g = avio_r8(pb); |
| avio_r8(pb); |
| b = avio_r8(pb); |
| avio_r8(pb); |
| palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b); |
| } |
| } |
| } |
| |
| return 1; |
| } |
| |
| return 0; |
| } |