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2d764069be
In C, qualifiers for arrays are broken: const VLC_TYPE (*foo)[2] is a pointer to an array of two const VLC_TYPE elements and unfortunately this is not compatible with a pointer to a const array of two VLC_TYPE, because the latter does not exist as array types are never qualified (the qualifier applies to the base type instead). This is the reason why get_vlc2() doesn't accept a const VLC table despite not modifying the table at all, as there is no automatic conversion from VLC_TYPE (*)[2] to const VLC_TYPE (*)[2]. Fix this by using a structure VLCElem for the VLC table. This also has the advantage of making it clear which element is which. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
80 lines
3.1 KiB
C
80 lines
3.1 KiB
C
/*
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* Helpers for generating hard-coded VLC tables
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*
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* Copyright (c) 2014 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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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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#ifndef AVCODEC_TABLEPRINT_VLC_H
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#define AVCODEC_TABLEPRINT_VLC_H
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#define AVUTIL_LOG_H
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#define av_log(a, ...) while(0)
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#define ff_dlog(a, ...) while(0)
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#define AVUTIL_MEM_H
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#define av_malloc(s) NULL
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#define av_malloc_array(a, b) NULL
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#define av_realloc_f(p, o, n) NULL
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#define av_free(p) while(0)
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#define av_freep(p) while(0)
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#define AVUTIL_INTERNAL_H
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#define avpriv_request_sample(...)
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#include "tableprint.h"
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#include "vlc.h"
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#include "libavutil/reverse.c"
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#include "vlc.c"
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// The following will have to be modified if VLCBaseType changes.
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WRITE_1D_FUNC_ARGV(VLCElem, 3, "{ .sym =%5" PRId16 ", .len =%2"PRIi16 " }",
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data[i].sym, data[i].len)
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static void write_vlc_type(const VLC *vlc, const VLCElem *base_table, const char *base_table_name)
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{
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printf(" .bits = %i,\n", vlc->bits);
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// Unfortunately need to cast away const currently
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printf(" .table = (VLCElem *)(%s + 0x%x),\n", base_table_name, (int)(vlc->table - base_table));
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printf(" .table_size = 0x%x,\n", vlc->table_size);
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printf(" .table_allocated = 0x%x,\n", vlc->table_allocated);
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}
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#define WRITE_VLC_TABLE(prefix, name) \
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WRITE_ARRAY(prefix, VLCElem, name)
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#define WRITE_VLC_TYPE(prefix, name, base_table) \
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do { \
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printf(prefix" VLC "#name" = {\n"); \
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write_vlc_type(&name, base_table, #base_table); \
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printf("};\n"); \
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} while(0)
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#define WRITE_VLC_ARRAY(prefix, name, base_table) \
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do { \
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int i; \
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const size_t array_size = FF_ARRAY_ELEMS(name); \
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printf(prefix" VLC "#name"[%"FMT"] = {{\n", \
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array_size); \
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for (i = 0; i < array_size; i++) { \
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write_vlc_type(name + i, \
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base_table, #base_table); \
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if (i != array_size - 1) printf("}, {\n"); \
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} \
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printf("}};\n"); \
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} while(0)
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#endif /* AVCODEC_TABLEPRINT_VLC_H */
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