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