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611 lines
21 KiB
C
611 lines
21 KiB
C
/*
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* gstjpegparser.c - JPEG parser
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*
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* Copyright (C) 2011-2012 Intel Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <gst/base/gstbytereader.h>
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#include "gstjpegparser.h"
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#ifndef GST_DISABLE_GST_DEBUG
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#define GST_CAT_DEFAULT ensure_debug_category()
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static GstDebugCategory *
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ensure_debug_category (void)
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{
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static gsize cat_gonce = 0;
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if (g_once_init_enter (&cat_gonce)) {
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gsize cat_done;
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cat_done = (gsize) _gst_debug_category_new ("codecparsers_jpeg", 0,
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"GstJpegCodecParser");
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g_once_init_leave (&cat_gonce, cat_done);
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}
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return (GstDebugCategory *) cat_gonce;
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}
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#else
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#define ensure_debug_category() /* NOOP */
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#endif /* GST_DISABLE_GST_DEBUG */
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#define DEBUG_PRINT_COMMENT 0
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#define READ_UINT8(reader, val) G_STMT_START { \
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if (!gst_byte_reader_get_uint8 ((reader), &(val))) { \
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GST_WARNING ("failed to read uint8"); \
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goto failed; \
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} \
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} G_STMT_END
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#define READ_UINT16(reader, val) G_STMT_START { \
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if (!gst_byte_reader_get_uint16_be ((reader), &(val))) { \
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GST_WARNING ("failed to read uint16"); \
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goto failed; \
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} \
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} G_STMT_END
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#define READ_BYTES(reader, buf, length) G_STMT_START { \
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const guint8 *vals; \
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if (!gst_byte_reader_get_data (reader, length, &vals)) { \
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GST_WARNING ("failed to read bytes, size:%d", length); \
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goto failed; \
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} \
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memcpy (buf, vals, length); \
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} G_STMT_END
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#define U_READ_UINT8(reader, val) G_STMT_START { \
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(val) = gst_byte_reader_get_uint8_unchecked(reader); \
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} G_STMT_END
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#define U_READ_UINT16(reader, val) G_STMT_START { \
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(val) = gst_byte_reader_get_uint16_be_unchecked(reader); \
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} G_STMT_END
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/* Table used to address an 8x8 matrix in zig-zag order */
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/* *INDENT-OFF* */
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static const guint8 zigzag_index[64] = {
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0, 1, 8, 16, 9, 2, 3, 10,
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17, 24, 32, 25, 18, 11, 4, 5,
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12, 19, 26, 33, 40, 48, 41, 34,
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27, 20, 13, 6, 7, 14, 21, 28,
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35, 42, 49, 56, 57, 50, 43, 36,
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29, 22, 15, 23, 30, 37, 44, 51,
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58, 59, 52, 45, 38, 31, 39, 46,
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53, 60, 61, 54, 47, 55, 62, 63
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};
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/* *INDENT-ON* */
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/* Table K.1 - Luminance quantization table */
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/* *INDENT-OFF* */
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static const guint8 default_luminance_quant_table[64] = {
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16, 11, 10, 16, 24, 40, 51, 61,
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12, 12, 14, 19, 26, 58, 60, 55,
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14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62,
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18, 22, 37, 56, 68, 109, 103, 77,
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24, 35, 55, 64, 81, 104, 113, 92,
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49, 64, 78, 87, 103, 121, 120, 101,
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72, 92, 95, 98, 112, 100, 103, 99
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};
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/* *INDENT-ON* */
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/* Table K.2 - Chrominance quantization table */
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/* *INDENT-OFF* */
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static const guint8 default_chrominance_quant_table[64] = {
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17, 18, 24, 47, 99, 99, 99, 99,
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18, 21, 26, 66, 99, 99, 99, 99,
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24, 26, 56, 99, 99, 99, 99, 99,
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47, 66, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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};
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/* *INDENT-ON* */
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typedef struct _GstJpegHuffmanTableEntry GstJpegHuffmanTableEntry;
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struct _GstJpegHuffmanTableEntry
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{
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guint8 value; /* category */
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guint8 length; /* code length in bits */
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};
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/* Table K.3 - Table for luminance DC coefficient differences */
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static const GstJpegHuffmanTableEntry default_luminance_dc_table[] = {
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{0x00, 2}, {0x01, 3}, {0x02, 3}, {0x03, 3}, {0x04, 3}, {0x05, 3},
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{0x06, 4}, {0x07, 5}, {0x08, 6}, {0x09, 7}, {0x0a, 8}, {0x0b, 9}
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};
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/* Table K.4 - Table for chrominance DC coefficient differences */
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static const GstJpegHuffmanTableEntry default_chrominance_dc_table[] = {
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{0x00, 2}, {0x01, 2}, {0x02, 2}, {0x03, 3}, {0x04, 4}, {0x05, 5},
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{0x06, 6}, {0x07, 7}, {0x08, 8}, {0x09, 9}, {0x0a, 10}, {0x0b, 11}
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};
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/* Table K.5 - Table for luminance AC coefficients */
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/* *INDENT-OFF* */
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static const GstJpegHuffmanTableEntry default_luminance_ac_table[] = {
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{0x00, 4}, {0x01, 2}, {0x02, 2}, {0x03, 3}, {0x04, 4}, {0x05, 5},
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{0x06, 7}, {0x07, 8}, {0x08, 10}, {0x09, 16}, {0x0a, 16}, {0x11, 4},
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{0x12, 5}, {0x13, 7}, {0x14, 9}, {0x15, 11}, {0x16, 16}, {0x17, 16},
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{0x18, 16}, {0x19, 16}, {0x1a, 16}, {0x21, 5}, {0x22, 8}, {0x23, 10},
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{0x24, 12}, {0x25, 16}, {0x26, 16}, {0x27, 16}, {0x28, 16}, {0x29, 16},
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{0x2a, 16}, {0x31, 6}, {0x32, 9}, {0x33, 12}, {0x34, 16}, {0x35, 16},
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{0x36, 16}, {0x37, 16}, {0x38, 16}, {0x39, 16}, {0x3a, 16}, {0x41, 6},
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{0x42, 10}, {0x43, 16}, {0x44, 16}, {0x45, 16}, {0x46, 16}, {0x47, 16},
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{0x48, 16}, {0x49, 16}, {0x4a, 16}, {0x51, 7}, {0x52, 11}, {0x53, 16},
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{0x54, 16}, {0x55, 16}, {0x56, 16}, {0x57, 16}, {0x58, 16}, {0x59, 16},
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{0x5a, 16}, {0x61, 7}, {0x62, 12}, {0x63, 16}, {0x64, 16}, {0x65, 16},
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{0x66, 16}, {0x67, 16}, {0x68, 16}, {0x69, 16}, {0x6a, 16}, {0x71, 8},
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{0x72, 12}, {0x73, 16}, {0x74, 16}, {0x75, 16}, {0x76, 16}, {0x77, 16},
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{0x78, 16}, {0x79, 16}, {0x7a, 16}, {0x81, 9}, {0x82, 15}, {0x83, 16},
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{0x84, 16}, {0x85, 16}, {0x86, 16}, {0x87, 16}, {0x88, 16}, {0x89, 16},
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{0x8a, 16}, {0x91, 9}, {0x92, 16}, {0x93, 16}, {0x94, 16}, {0x95, 16},
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{0x96, 16}, {0x97, 16}, {0x98, 16}, {0x99, 16}, {0x9a, 16}, {0xa1, 9},
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{0xa2, 16}, {0xa3, 16}, {0xa4, 16}, {0xa5, 16}, {0xa6, 16}, {0xa7, 16},
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{0xa8, 16}, {0xa9, 16}, {0xaa, 16}, {0xb1, 10}, {0xb2, 16}, {0xb3, 16},
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{0xb4, 16}, {0xb5, 16}, {0xb6, 16}, {0xb7, 16}, {0xb8, 16}, {0xb9, 16},
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{0xba, 16}, {0xc1, 10}, {0xc2, 16}, {0xc3, 16}, {0xc4, 16}, {0xc5, 16},
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{0xc6, 16}, {0xc7, 16}, {0xc8, 16}, {0xc9, 16}, {0xca, 16}, {0xd1, 11},
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{0xd2, 16}, {0xd3, 16}, {0xd4, 16}, {0xd5, 16}, {0xd6, 16}, {0xd7, 16},
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{0xd8, 16}, {0xd9, 16}, {0xda, 16}, {0xe1, 16}, {0xe2, 16}, {0xe3, 16},
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{0xe4, 16}, {0xe5, 16}, {0xe6, 16}, {0xe7, 16}, {0xe8, 16}, {0xe9, 16},
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{0xea, 16}, {0xf0, 11}, {0xf1, 16}, {0xf2, 16}, {0xf3, 16}, {0xf4, 16},
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{0xf5, 16}, {0xf6, 16}, {0xf7, 16}, {0xf8, 16}, {0xf9, 16}, {0xfa, 16}
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};
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/* *INDENT-ON* */
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/* Table K.6 - Table for chrominance AC coefficients */
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/* *INDENT-OFF* */
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static const GstJpegHuffmanTableEntry default_chrominance_ac_table[] = {
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{0x00, 2}, {0x01, 2}, {0x02, 3}, {0x03, 4}, {0x04, 5}, {0x05, 5},
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{0x06, 6}, {0x07, 7}, {0x08, 9}, {0x09, 10}, {0x0a, 12}, {0x11, 4},
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{0x12, 6}, {0x13, 8}, {0x14, 9}, {0x15, 11}, {0x16, 12}, {0x17, 16},
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{0x18, 16}, {0x19, 16}, {0x1a, 16}, {0x21, 5}, {0x22, 8}, {0x23, 10},
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{0x24, 12}, {0x25, 15}, {0x26, 16}, {0x27, 16}, {0x28, 16}, {0x29, 16},
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{0x2a, 16}, {0x31, 5}, {0x32, 8}, {0x33, 10}, {0x34, 12}, {0x35, 16},
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{0x36, 16}, {0x37, 16}, {0x38, 16}, {0x39, 16}, {0x3a, 16}, {0x41, 6},
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{0x42, 9}, {0x43, 16}, {0x44, 16}, {0x45, 16}, {0x46, 16}, {0x47, 16},
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{0x48, 16}, {0x49, 16}, {0x4a, 16}, {0x51, 6}, {0x52, 10}, {0x53, 16},
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{0x54, 16}, {0x55, 16}, {0x56, 16}, {0x57, 16}, {0x58, 16}, {0x59, 16},
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{0x5a, 16}, {0x61, 7}, {0x62, 11}, {0x63, 16}, {0x64, 16}, {0x65, 16},
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{0x66, 16}, {0x67, 16}, {0x68, 16}, {0x69, 16}, {0x6a, 16}, {0x71, 7},
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{0x72, 11}, {0x73, 16}, {0x74, 16}, {0x75, 16}, {0x76, 16}, {0x77, 16},
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{0x78, 16}, {0x79, 16}, {0x7a, 16}, {0x81, 8}, {0x82, 16}, {0x83, 16},
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{0x84, 16}, {0x85, 16}, {0x86, 16}, {0x87, 16}, {0x88, 16}, {0x89, 16},
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{0x8a, 16}, {0x91, 9}, {0x92, 16}, {0x93, 16}, {0x94, 16}, {0x95, 16},
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{0x96, 16}, {0x97, 16}, {0x98, 16}, {0x99, 16}, {0x9a, 16}, {0xa1, 9},
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{0xa2, 16}, {0xa3, 16}, {0xa4, 16}, {0xa5, 16}, {0xa6, 16}, {0xa7, 16},
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{0xa8, 16}, {0xa9, 16}, {0xaa, 16}, {0xb1, 9}, {0xb2, 16}, {0xb3, 16},
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{0xb4, 16}, {0xb5, 16}, {0xb6, 16}, {0xb7, 16}, {0xb8, 16}, {0xb9, 16},
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{0xba, 16}, {0xc1, 9}, {0xc2, 16}, {0xc3, 16}, {0xc4, 16}, {0xc5, 16},
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{0xc6, 16}, {0xc7, 16}, {0xc8, 16}, {0xc9, 16}, {0xca, 16}, {0xd1, 11},
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{0xd2, 16}, {0xd3, 16}, {0xd4, 16}, {0xd5, 16}, {0xd6, 16}, {0xd7, 16},
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{0xd8, 16}, {0xd9, 16}, {0xda, 16}, {0xe1, 14}, {0xe2, 16}, {0xe3, 16},
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{0xe4, 16}, {0xe5, 16}, {0xe6, 16}, {0xe7, 16}, {0xe8, 16}, {0xe9, 16},
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{0xea, 16}, {0xf0, 10}, {0xf1, 15}, {0xf2, 16}, {0xf3, 16}, {0xf4, 16},
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{0xf5, 16}, {0xf6, 16}, {0xf7, 16}, {0xf8, 16}, {0xf9, 16}, {0xfa, 16}
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};
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/* *INDENT-ON* */
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static inline gboolean
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jpeg_parse_to_next_marker (GstByteReader * br, guint8 * marker)
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{
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gint ofs;
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ofs = gst_jpeg_scan_for_marker_code (br->data, br->size, br->byte);
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if (ofs < 0)
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return FALSE;
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if (marker)
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*marker = br->data[ofs + 1];
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gst_byte_reader_skip (br, ofs - br->byte + 2);
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return TRUE;
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}
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gint
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gst_jpeg_scan_for_marker_code (const guint8 * data, gsize size, guint offset)
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{
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guint i;
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g_return_val_if_fail (data != NULL, -1);
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g_return_val_if_fail (size > offset, -1);
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for (i = offset; i < size - 1;) {
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if (data[i] != 0xff)
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i++;
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else {
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const guint8 v = data[i + 1];
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if (v >= 0xc0 && v <= 0xfe)
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return i;
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i += 2;
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}
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}
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return -1;
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}
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gboolean
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gst_jpeg_parse_frame_hdr (GstJpegFrameHdr * frame_hdr,
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const guint8 * data, gsize size, guint offset)
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{
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GstByteReader br;
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guint16 length;
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guint8 val;
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guint i;
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g_return_val_if_fail (frame_hdr != NULL, FALSE);
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g_return_val_if_fail (data != NULL, FALSE);
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g_return_val_if_fail (size > offset, FALSE);
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size -= offset;
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gst_byte_reader_init (&br, &data[offset], size);
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g_return_val_if_fail (size >= 8, FALSE);
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U_READ_UINT16 (&br, length); /* Lf */
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g_return_val_if_fail (size >= length, FALSE);
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U_READ_UINT8 (&br, frame_hdr->sample_precision);
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U_READ_UINT16 (&br, frame_hdr->height);
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U_READ_UINT16 (&br, frame_hdr->width);
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U_READ_UINT8 (&br, frame_hdr->num_components);
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g_return_val_if_fail (frame_hdr->num_components <=
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GST_JPEG_MAX_SCAN_COMPONENTS, FALSE);
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length -= 8;
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g_return_val_if_fail (length >= 3 * frame_hdr->num_components, FALSE);
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for (i = 0; i < frame_hdr->num_components; i++) {
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U_READ_UINT8 (&br, frame_hdr->components[i].identifier);
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U_READ_UINT8 (&br, val);
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frame_hdr->components[i].horizontal_factor = (val >> 4) & 0x0F;
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frame_hdr->components[i].vertical_factor = (val & 0x0F);
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U_READ_UINT8 (&br, frame_hdr->components[i].quant_table_selector);
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g_return_val_if_fail ((frame_hdr->components[i].horizontal_factor <= 4 &&
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frame_hdr->components[i].vertical_factor <= 4 &&
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frame_hdr->components[i].quant_table_selector < 4), FALSE);
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length -= 3;
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}
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g_assert (length == 0);
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return TRUE;
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}
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gboolean
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gst_jpeg_parse_scan_hdr (GstJpegScanHdr * scan_hdr,
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const guint8 * data, gsize size, guint offset)
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{
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GstByteReader br;
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guint16 length;
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guint8 val;
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guint i;
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g_return_val_if_fail (scan_hdr != NULL, FALSE);
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g_return_val_if_fail (data != NULL, FALSE);
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g_return_val_if_fail (size > offset, FALSE);
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size -= offset;
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gst_byte_reader_init (&br, &data[offset], size);
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g_return_val_if_fail (size >= 3, FALSE);
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U_READ_UINT16 (&br, length); /* Ls */
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g_return_val_if_fail (size >= length, FALSE);
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U_READ_UINT8 (&br, scan_hdr->num_components);
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g_return_val_if_fail (scan_hdr->num_components <=
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GST_JPEG_MAX_SCAN_COMPONENTS, FALSE);
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length -= 3;
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g_return_val_if_fail (length >= 2 * scan_hdr->num_components, FALSE);
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for (i = 0; i < scan_hdr->num_components; i++) {
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U_READ_UINT8 (&br, scan_hdr->components[i].component_selector);
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U_READ_UINT8 (&br, val);
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scan_hdr->components[i].dc_selector = (val >> 4) & 0x0F;
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scan_hdr->components[i].ac_selector = val & 0x0F;
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g_return_val_if_fail ((scan_hdr->components[i].dc_selector < 4 &&
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scan_hdr->components[i].ac_selector < 4), FALSE);
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length -= 2;
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}
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/* FIXME: Ss, Se, Ah, Al */
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g_assert (length == 3);
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return TRUE;
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}
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gboolean
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gst_jpeg_parse_huffman_table (GstJpegHuffmanTables * huf_tables,
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const guint8 * data, gsize size, guint offset)
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{
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GstByteReader br;
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GstJpegHuffmanTable *huf_table;
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guint16 length;
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guint8 val, table_class, table_index;
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guint32 value_count;
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guint i;
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g_return_val_if_fail (huf_tables != NULL, FALSE);
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g_return_val_if_fail (data != NULL, FALSE);
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g_return_val_if_fail (size > offset, FALSE);
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size -= offset;
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gst_byte_reader_init (&br, &data[offset], size);
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g_return_val_if_fail (size >= 2, FALSE);
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U_READ_UINT16 (&br, length); /* Lh */
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g_return_val_if_fail (size >= length, FALSE);
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while (gst_byte_reader_get_remaining (&br)) {
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U_READ_UINT8 (&br, val);
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|
table_class = ((val >> 4) & 0x0F);
|
|
table_index = (val & 0x0F);
|
|
g_return_val_if_fail (table_index < GST_JPEG_MAX_SCAN_COMPONENTS, FALSE);
|
|
if (table_class == 0) {
|
|
huf_table = &huf_tables->dc_tables[table_index];
|
|
} else {
|
|
huf_table = &huf_tables->ac_tables[table_index];
|
|
}
|
|
READ_BYTES (&br, huf_table->huf_bits, 16);
|
|
value_count = 0;
|
|
for (i = 0; i < 16; i++)
|
|
value_count += huf_table->huf_bits[i];
|
|
READ_BYTES (&br, huf_table->huf_values, value_count);
|
|
huf_table->valid = TRUE;
|
|
}
|
|
return TRUE;
|
|
|
|
failed:
|
|
return FALSE;
|
|
}
|
|
|
|
gboolean
|
|
gst_jpeg_parse_quant_table (GstJpegQuantTables * quant_tables,
|
|
const guint8 * data, gsize size, guint offset)
|
|
{
|
|
GstByteReader br;
|
|
GstJpegQuantTable *quant_table;
|
|
guint16 length;
|
|
guint8 val, table_index;
|
|
guint i;
|
|
|
|
g_return_val_if_fail (quant_tables != NULL, FALSE);
|
|
g_return_val_if_fail (data != NULL, FALSE);
|
|
g_return_val_if_fail (size > offset, FALSE);
|
|
|
|
size -= offset;
|
|
gst_byte_reader_init (&br, &data[offset], size);
|
|
g_return_val_if_fail (size >= 2, FALSE);
|
|
|
|
U_READ_UINT16 (&br, length); /* Lq */
|
|
g_return_val_if_fail (size >= length, FALSE);
|
|
|
|
while (gst_byte_reader_get_remaining (&br)) {
|
|
U_READ_UINT8 (&br, val);
|
|
table_index = (val & 0x0f);
|
|
g_return_val_if_fail (table_index < GST_JPEG_MAX_SCAN_COMPONENTS, FALSE);
|
|
quant_table = &quant_tables->quant_tables[table_index];
|
|
quant_table->quant_precision = ((val >> 4) & 0x0f);
|
|
|
|
g_return_val_if_fail (gst_byte_reader_get_remaining (&br) >=
|
|
GST_JPEG_MAX_QUANT_ELEMENTS * (1 + ! !quant_table->quant_precision),
|
|
FALSE);
|
|
for (i = 0; i < GST_JPEG_MAX_QUANT_ELEMENTS; i++) {
|
|
if (!quant_table->quant_precision) { /* 8-bit values */
|
|
U_READ_UINT8 (&br, val);
|
|
quant_table->quant_table[i] = val;
|
|
} else { /* 16-bit values */
|
|
U_READ_UINT16 (&br, quant_table->quant_table[i]);
|
|
}
|
|
}
|
|
quant_table->valid = TRUE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
gst_jpeg_parse_restart_interval (guint * interval,
|
|
const guint8 * data, gsize size, guint offset)
|
|
{
|
|
GstByteReader br;
|
|
guint16 length, val;
|
|
|
|
g_return_val_if_fail (interval != NULL, FALSE);
|
|
g_return_val_if_fail (data != NULL, FALSE);
|
|
g_return_val_if_fail (size > offset, FALSE);
|
|
|
|
size -= offset;
|
|
gst_byte_reader_init (&br, &data[offset], size);
|
|
g_return_val_if_fail (size >= 4, FALSE);
|
|
|
|
U_READ_UINT16 (&br, length); /* Lr */
|
|
g_return_val_if_fail (size >= length, FALSE);
|
|
|
|
U_READ_UINT16 (&br, val);
|
|
*interval = val;
|
|
return TRUE;
|
|
}
|
|
|
|
static int
|
|
compare_huffman_table_entry (const void *a, const void *b)
|
|
{
|
|
const GstJpegHuffmanTableEntry *const e1 = *(GstJpegHuffmanTableEntry **) a;
|
|
const GstJpegHuffmanTableEntry *const e2 = *(GstJpegHuffmanTableEntry **) b;
|
|
|
|
if (e1->length == e2->length)
|
|
return (gint) e1->value - (gint) e2->value;
|
|
return (gint) e1->length - (gint) e2->length;
|
|
}
|
|
|
|
static void
|
|
build_huffman_table (GstJpegHuffmanTable * huf_table,
|
|
const GstJpegHuffmanTableEntry * entries, guint num_entries)
|
|
{
|
|
const GstJpegHuffmanTableEntry *sorted_entries[256];
|
|
guint i, j, n;
|
|
|
|
g_assert (num_entries <= G_N_ELEMENTS (sorted_entries));
|
|
|
|
for (i = 0; i < num_entries; i++)
|
|
sorted_entries[i] = &entries[i];
|
|
qsort (sorted_entries, num_entries, sizeof (sorted_entries[0]),
|
|
compare_huffman_table_entry);
|
|
|
|
for (i = 0, j = 1, n = 0; i < num_entries; i++) {
|
|
const GstJpegHuffmanTableEntry *const e = sorted_entries[i];
|
|
if (e->length != j) {
|
|
huf_table->huf_bits[j++ - 1] = n;
|
|
for (; j < e->length; j++)
|
|
huf_table->huf_bits[j - 1] = 0;
|
|
n = 0;
|
|
}
|
|
huf_table->huf_values[i] = e->value;
|
|
n++;
|
|
}
|
|
|
|
for (; j < G_N_ELEMENTS (huf_table->huf_bits); j++)
|
|
huf_table->huf_bits[j] = 0;
|
|
for (; i < G_N_ELEMENTS (huf_table->huf_values); i++)
|
|
huf_table->huf_values[i] = 0;
|
|
huf_table->valid = TRUE;
|
|
}
|
|
|
|
void
|
|
gst_jpeg_get_default_huffman_tables (GstJpegHuffmanTables * huf_tables)
|
|
{
|
|
g_assert (huf_tables);
|
|
|
|
/* Build DC tables */
|
|
build_huffman_table (&huf_tables->dc_tables[0], default_luminance_dc_table,
|
|
G_N_ELEMENTS (default_luminance_dc_table));
|
|
build_huffman_table (&huf_tables->dc_tables[1], default_chrominance_dc_table,
|
|
G_N_ELEMENTS (default_chrominance_dc_table));
|
|
memcpy (&huf_tables->dc_tables[2], &huf_tables->dc_tables[1],
|
|
sizeof (huf_tables->dc_tables[2]));
|
|
|
|
/* Build AC tables */
|
|
build_huffman_table (&huf_tables->ac_tables[0], default_luminance_ac_table,
|
|
G_N_ELEMENTS (default_luminance_ac_table));
|
|
build_huffman_table (&huf_tables->ac_tables[1], default_chrominance_ac_table,
|
|
G_N_ELEMENTS (default_chrominance_ac_table));
|
|
memcpy (&huf_tables->ac_tables[2], &huf_tables->ac_tables[1],
|
|
sizeof (huf_tables->ac_tables[2]));
|
|
}
|
|
|
|
static void
|
|
build_quant_table (GstJpegQuantTable * quant_table, const guint8 values[64])
|
|
{
|
|
guint i;
|
|
|
|
for (i = 0; i < 64; i++)
|
|
quant_table->quant_table[i] = values[zigzag_index[i]];
|
|
quant_table->quant_precision = 0; /* Pq = 0 (8-bit precision) */
|
|
quant_table->valid = TRUE;
|
|
}
|
|
|
|
void
|
|
gst_jpeg_get_default_quantization_tables (GstJpegQuantTables * quant_tables)
|
|
{
|
|
g_assert (quant_tables);
|
|
|
|
build_quant_table (&quant_tables->quant_tables[0],
|
|
default_luminance_quant_table);
|
|
build_quant_table (&quant_tables->quant_tables[1],
|
|
default_chrominance_quant_table);
|
|
build_quant_table (&quant_tables->quant_tables[2],
|
|
default_chrominance_quant_table);
|
|
}
|
|
|
|
gboolean
|
|
gst_jpeg_parse (GstJpegMarkerSegment * seg,
|
|
const guint8 * data, gsize size, guint offset)
|
|
{
|
|
GstByteReader br;
|
|
guint16 length;
|
|
|
|
g_return_val_if_fail (seg != NULL, FALSE);
|
|
|
|
if (size <= offset) {
|
|
GST_DEBUG ("failed to parse from offset %u, buffer is too small", offset);
|
|
return FALSE;
|
|
}
|
|
|
|
size -= offset;
|
|
gst_byte_reader_init (&br, &data[offset], size);
|
|
|
|
if (!jpeg_parse_to_next_marker (&br, &seg->marker)) {
|
|
GST_DEBUG ("failed to find marker code");
|
|
return FALSE;
|
|
}
|
|
|
|
seg->offset = offset + gst_byte_reader_get_pos (&br);
|
|
seg->size = -1;
|
|
|
|
/* Try to find end of segment */
|
|
switch (seg->marker) {
|
|
case GST_JPEG_MARKER_SOI:
|
|
case GST_JPEG_MARKER_EOI:
|
|
fixed_size_segment:
|
|
seg->size = 2;
|
|
break;
|
|
|
|
case (GST_JPEG_MARKER_SOF_MIN + 0): /* Lf */
|
|
case (GST_JPEG_MARKER_SOF_MIN + 1): /* Lf */
|
|
case (GST_JPEG_MARKER_SOF_MIN + 2): /* Lf */
|
|
case (GST_JPEG_MARKER_SOF_MIN + 3): /* Lf */
|
|
case (GST_JPEG_MARKER_SOF_MIN + 9): /* Lf */
|
|
case (GST_JPEG_MARKER_SOF_MIN + 10): /* Lf */
|
|
case (GST_JPEG_MARKER_SOF_MIN + 11): /* Lf */
|
|
case GST_JPEG_MARKER_SOS: /* Ls */
|
|
case GST_JPEG_MARKER_DQT: /* Lq */
|
|
case GST_JPEG_MARKER_DHT: /* Lh */
|
|
case GST_JPEG_MARKER_DAC: /* La */
|
|
case GST_JPEG_MARKER_DRI: /* Lr */
|
|
case GST_JPEG_MARKER_COM: /* Lc */
|
|
case GST_JPEG_MARKER_DNL: /* Ld */
|
|
variable_size_segment:
|
|
READ_UINT16 (&br, length);
|
|
seg->size = length;
|
|
break;
|
|
|
|
default:
|
|
/* Application data segment length (Lp) */
|
|
if (seg->marker >= GST_JPEG_MARKER_APP_MIN &&
|
|
seg->marker <= GST_JPEG_MARKER_APP_MAX)
|
|
goto variable_size_segment;
|
|
|
|
/* Restart markers (fixed size, two bytes only) */
|
|
if (seg->marker >= GST_JPEG_MARKER_RST_MIN &&
|
|
seg->marker <= GST_JPEG_MARKER_RST_MAX)
|
|
goto fixed_size_segment;
|
|
|
|
/* Fallback: scan for next marker */
|
|
if (!jpeg_parse_to_next_marker (&br, NULL))
|
|
goto failed;
|
|
seg->size = gst_byte_reader_get_pos (&br) - seg->offset;
|
|
break;
|
|
}
|
|
return TRUE;
|
|
|
|
failed:
|
|
return FALSE;
|
|
}
|