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b6411ae74c
For each lib we build export its own API in headers when we're building it, otherwise import the API from the headers. This fixes linker warnings on Windows when building with MSVC. The problem was that we had defined all GST_*_API decorators unconditionally to GST_EXPORT. This was intentional and only supposed to be temporary, but caused linker warnings because we tell the linker that we want to export all symbols even those from externall DLLs, and when the linker notices that they were in external DLLS and not present locally it warns. What we need to do when building each library is: export the library's own symbols and import all other symbols. To this end we define e.g. BUILDING_GST_FOO and then we define the GST_FOO_API decorator either to export or to import symbols depending on whether BUILDING_GST_FOO is set or not. That way external users of each library API automatically get the import. While we're at it, add new GST_API_EXPORT in config.h and use that for GST_*_API decorators instead of GST_EXPORT. The right export define depends on the toolchain and whether we're using -fvisibility=hidden or not, so it's better to set it to the right thing directly than hard-coding a compiler whitelist in the public header. We put the export define into config.h instead of passing it via the command line to the compiler because it might contain spaces and brackets and in the autotools scenario we'd have to pass that through multiple layers of plumbing and Makefile/shell escaping and we're just not going to be *that* lucky. The export define is only used if we're compiling our lib, not by external users of the lib headers, so it's not a problem to put it into config.h Also, this means all .c files of libs need to include config.h to get the export marker defined, so fix up a few that didn't include config.h. This commit depends on a common submodule commit that makes gst-glib-gen.mak add an #include "config.h" to generated enum/marshal .c files for the autotools build. https://bugzilla.gnome.org/show_bug.cgi?id=797185
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "dboolhuff.h"
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int
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vp8dx_start_decode (BOOL_DECODER * br,
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const unsigned char *source,
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unsigned int source_sz, vp8_decrypt_cb * decrypt_cb, void *decrypt_state)
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{
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br->user_buffer_end = source + source_sz;
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br->user_buffer = source;
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br->value = 0;
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br->count = -8;
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br->range = 255;
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br->decrypt_cb = decrypt_cb;
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br->decrypt_state = decrypt_state;
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if (source_sz && !source)
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return 1;
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/* Populate the buffer */
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vp8dx_bool_decoder_fill (br);
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return 0;
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}
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void
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vp8dx_bool_decoder_fill (BOOL_DECODER * br)
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{
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const unsigned char *bufptr = br->user_buffer;
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VP8_BD_VALUE value = br->value;
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int count = br->count;
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int shift = VP8_BD_VALUE_SIZE - 8 - (count + 8);
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size_t bytes_left = br->user_buffer_end - bufptr;
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size_t bits_left = bytes_left * CHAR_BIT;
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int x = (int) (shift + CHAR_BIT - bits_left);
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int loop_end = 0;
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unsigned char decrypted[sizeof (VP8_BD_VALUE) + 1];
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if (br->decrypt_cb) {
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size_t n =
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bytes_left > sizeof (decrypted) ? sizeof (decrypted) : bytes_left;
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br->decrypt_cb (br->decrypt_state, bufptr, decrypted, (int) n);
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bufptr = decrypted;
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}
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if (x >= 0) {
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count += VP8_LOTS_OF_BITS;
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loop_end = x;
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}
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if (x < 0 || bits_left) {
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while (shift >= loop_end) {
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count += CHAR_BIT;
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value |= (VP8_BD_VALUE) * bufptr << shift;
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++bufptr;
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++br->user_buffer;
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shift -= CHAR_BIT;
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}
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}
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br->value = value;
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br->count = count;
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}
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