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/*
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* DCA compatible decoder
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* Copyright (C) 2004 Gildas Bazin
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* Copyright (C) 2004 Benjamin Zores
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* Copyright (C) 2006 Benjamin Larsson
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* Copyright (C) 2007 Konstantin Shishkov
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* Copyright (C) 2016 foo86
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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_DCA_H
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#define AVCODEC_DCA_H
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#include <stdint.h>
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#include "libavutil/common.h"
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Add support for building shared libraries with MSVC
This requires the makedef perl script by Derek, from the
c89-to-c99 repo. That scripts produces a .def file, listing
the symbols to be exported, based on the gcc version scripts
and the built object files.
To properly load non-function symbols from DLL files, the
data symbol declarations need to have the attribute
__declspec(dllimport) when building the calling code. (On mingw,
the linker can fix this up automatically, which is why it has not
been an issue so far. If this attribute is omitted, linking
actually succeeds, but reads from the table will not produce the
desired results at runtime.)
MSVC seems to manage to link DLLs (and run properly) even if
this attribute is present while building the library itself
(which normally isn't recommended) - other object files in the
same library manage to link to the symbol (with a small warning
at link time, like "warning LNK4049: locally defined symbol
_avpriv_mpa_bitrate_tab imported" - it doesn't seem to be possible
to squelch this warning), and the definition of the tables
themselves produce a warning that can be squelched ("warning C4273:
'avpriv_mpa_bitrate_tab' : inconsistent dll linkage, see previous
definition of 'avpriv_mpa_bitrate_tab').
In this setup, mingw isn't able to link object files that refer to
data symbols with __declspec(dllimport) without those symbols
actually being linked via a DLL (linking avcodec.dll ends up with
errors like "undefined reference to `__imp__avpriv_mpa_freq_tab'").
The dllimport declspec isn't needed at all in mingw, so we simply
choose not to declare it for other compilers than MSVC that requires
it. (If ICL support later requires it, the condition can be extended
later to include both of them.)
This also implies that code that is built to link to a certain
library as a DLL can't link to the same library as a static library.
Therefore, we only allow building either static or shared but not
both at the same time. (That is, static libraries as such can be,
and actually are, built - this is used for linking the test tools to
internal symbols in the libraries - but e.g. libavformat built to
link to libavcodec as a DLL cannot link statically to libavcodec.)
Also, linking to DLLs is slightly different from linking to shared
libraries on other platforms. DLLs use a thing called import
libraries, which is basically a stub library allowing the linker
to know which symbols exist in the DLL and what name the DLL will
have at runtime.
In mingw/gcc, the import library is usually named libfoo.dll.a,
which goes next to a static library named libfoo.a. This allows
gcc to pick the dynamic one, if available, from the normal -lfoo
switches, just as it does for libfoo.a vs libfoo.so on Unix. On
MSVC however, you need to literally specify the name of the import
library instead of the static library.
Signed-off-by: Martin Storsjö <martin@martin.st>
12 years ago
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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enum DCASpeaker {
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DCA_SPEAKER_C, DCA_SPEAKER_L, DCA_SPEAKER_R, DCA_SPEAKER_Ls,
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DCA_SPEAKER_Rs, DCA_SPEAKER_LFE1, DCA_SPEAKER_Cs, DCA_SPEAKER_Lsr,
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DCA_SPEAKER_Rsr, DCA_SPEAKER_Lss, DCA_SPEAKER_Rss, DCA_SPEAKER_Lc,
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DCA_SPEAKER_Rc, DCA_SPEAKER_Lh, DCA_SPEAKER_Ch, DCA_SPEAKER_Rh,
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DCA_SPEAKER_LFE2, DCA_SPEAKER_Lw, DCA_SPEAKER_Rw, DCA_SPEAKER_Oh,
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DCA_SPEAKER_Lhs, DCA_SPEAKER_Rhs, DCA_SPEAKER_Chr, DCA_SPEAKER_Lhr,
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DCA_SPEAKER_Rhr, DCA_SPEAKER_Cl, DCA_SPEAKER_Ll, DCA_SPEAKER_Rl,
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DCA_SPEAKER_RSV1, DCA_SPEAKER_RSV2, DCA_SPEAKER_RSV3, DCA_SPEAKER_RSV4,
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DCA_SPEAKER_COUNT
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};
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enum DCASpeakerMask {
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DCA_SPEAKER_MASK_C = 0x00000001,
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DCA_SPEAKER_MASK_L = 0x00000002,
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DCA_SPEAKER_MASK_R = 0x00000004,
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DCA_SPEAKER_MASK_Ls = 0x00000008,
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DCA_SPEAKER_MASK_Rs = 0x00000010,
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DCA_SPEAKER_MASK_LFE1 = 0x00000020,
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DCA_SPEAKER_MASK_Cs = 0x00000040,
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DCA_SPEAKER_MASK_Lsr = 0x00000080,
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DCA_SPEAKER_MASK_Rsr = 0x00000100,
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DCA_SPEAKER_MASK_Lss = 0x00000200,
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DCA_SPEAKER_MASK_Rss = 0x00000400,
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DCA_SPEAKER_MASK_Lc = 0x00000800,
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DCA_SPEAKER_MASK_Rc = 0x00001000,
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DCA_SPEAKER_MASK_Lh = 0x00002000,
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DCA_SPEAKER_MASK_Ch = 0x00004000,
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DCA_SPEAKER_MASK_Rh = 0x00008000,
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DCA_SPEAKER_MASK_LFE2 = 0x00010000,
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DCA_SPEAKER_MASK_Lw = 0x00020000,
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DCA_SPEAKER_MASK_Rw = 0x00040000,
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DCA_SPEAKER_MASK_Oh = 0x00080000,
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DCA_SPEAKER_MASK_Lhs = 0x00100000,
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DCA_SPEAKER_MASK_Rhs = 0x00200000,
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DCA_SPEAKER_MASK_Chr = 0x00400000,
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DCA_SPEAKER_MASK_Lhr = 0x00800000,
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DCA_SPEAKER_MASK_Rhr = 0x01000000,
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DCA_SPEAKER_MASK_Cl = 0x02000000,
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DCA_SPEAKER_MASK_Ll = 0x04000000,
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DCA_SPEAKER_MASK_Rl = 0x08000000,
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};
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#define DCA_SPEAKER_LAYOUT_MONO (DCA_SPEAKER_MASK_C)
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#define DCA_SPEAKER_LAYOUT_STEREO (DCA_SPEAKER_MASK_L | DCA_SPEAKER_MASK_R)
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#define DCA_SPEAKER_LAYOUT_2POINT1 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_LFE1)
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#define DCA_SPEAKER_LAYOUT_3_0 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_C)
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#define DCA_SPEAKER_LAYOUT_2_1 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_Cs)
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#define DCA_SPEAKER_LAYOUT_3_1 (DCA_SPEAKER_LAYOUT_3_0 | DCA_SPEAKER_MASK_Cs)
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#define DCA_SPEAKER_LAYOUT_2_2 (DCA_SPEAKER_LAYOUT_STEREO | DCA_SPEAKER_MASK_Ls | DCA_SPEAKER_MASK_Rs)
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#define DCA_SPEAKER_LAYOUT_5POINT0 (DCA_SPEAKER_LAYOUT_3_0 | DCA_SPEAKER_MASK_Ls | DCA_SPEAKER_MASK_Rs)
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#define DCA_SPEAKER_LAYOUT_5POINT1 (DCA_SPEAKER_LAYOUT_5POINT0 | DCA_SPEAKER_MASK_LFE1)
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#define DCA_SPEAKER_LAYOUT_7POINT0_WIDE (DCA_SPEAKER_LAYOUT_5POINT0 | DCA_SPEAKER_MASK_Lw | DCA_SPEAKER_MASK_Rw)
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#define DCA_SPEAKER_LAYOUT_7POINT1_WIDE (DCA_SPEAKER_LAYOUT_7POINT0_WIDE | DCA_SPEAKER_MASK_LFE1)
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#define DCA_HAS_STEREO(mask) \
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((mask & DCA_SPEAKER_LAYOUT_STEREO) == DCA_SPEAKER_LAYOUT_STEREO)
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enum DCASpeakerPair {
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DCA_SPEAKER_PAIR_C = 0x0001,
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DCA_SPEAKER_PAIR_LR = 0x0002,
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DCA_SPEAKER_PAIR_LsRs = 0x0004,
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DCA_SPEAKER_PAIR_LFE1 = 0x0008,
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DCA_SPEAKER_PAIR_Cs = 0x0010,
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DCA_SPEAKER_PAIR_LhRh = 0x0020,
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DCA_SPEAKER_PAIR_LsrRsr = 0x0040,
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DCA_SPEAKER_PAIR_Ch = 0x0080,
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DCA_SPEAKER_PAIR_Oh = 0x0100,
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DCA_SPEAKER_PAIR_LcRc = 0x0200,
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DCA_SPEAKER_PAIR_LwRw = 0x0400,
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DCA_SPEAKER_PAIR_LssRss = 0x0800,
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DCA_SPEAKER_PAIR_LFE2 = 0x1000,
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DCA_SPEAKER_PAIR_LhsRhs = 0x2000,
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DCA_SPEAKER_PAIR_Chr = 0x4000,
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DCA_SPEAKER_PAIR_LhrRhr = 0x8000
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};
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/**
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* Return number of individual channels in DCASpeakerPair mask
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*/
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static inline int ff_dca_count_chs_for_mask(unsigned int mask)
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{
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return av_popcount((mask & 0xffff) | ((mask & 0xae66) << 16));
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}
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enum DCARepresentationType {
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DCA_REPR_TYPE_LtRt = 2,
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DCA_REPR_TYPE_LhRh = 3
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};
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enum DCAExtensionMask {
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DCA_CSS_CORE = 0x001,
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DCA_CSS_XXCH = 0x002,
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DCA_CSS_X96 = 0x004,
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DCA_CSS_XCH = 0x008,
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DCA_CSS_MASK = 0x00f,
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DCA_EXSS_CORE = 0x010,
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DCA_EXSS_XBR = 0x020,
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DCA_EXSS_XXCH = 0x040,
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DCA_EXSS_X96 = 0x080,
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DCA_EXSS_LBR = 0x100,
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DCA_EXSS_XLL = 0x200,
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DCA_EXSS_RSV1 = 0x400,
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DCA_EXSS_RSV2 = 0x800,
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DCA_EXSS_MASK = 0xff0,
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};
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enum DCADownMixType {
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DCA_DMIX_TYPE_1_0,
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DCA_DMIX_TYPE_LoRo,
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DCA_DMIX_TYPE_LtRt,
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DCA_DMIX_TYPE_3_0,
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DCA_DMIX_TYPE_2_1,
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DCA_DMIX_TYPE_2_2,
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DCA_DMIX_TYPE_3_1,
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DCA_DMIX_TYPE_COUNT
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};
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Add support for building shared libraries with MSVC
This requires the makedef perl script by Derek, from the
c89-to-c99 repo. That scripts produces a .def file, listing
the symbols to be exported, based on the gcc version scripts
and the built object files.
To properly load non-function symbols from DLL files, the
data symbol declarations need to have the attribute
__declspec(dllimport) when building the calling code. (On mingw,
the linker can fix this up automatically, which is why it has not
been an issue so far. If this attribute is omitted, linking
actually succeeds, but reads from the table will not produce the
desired results at runtime.)
MSVC seems to manage to link DLLs (and run properly) even if
this attribute is present while building the library itself
(which normally isn't recommended) - other object files in the
same library manage to link to the symbol (with a small warning
at link time, like "warning LNK4049: locally defined symbol
_avpriv_mpa_bitrate_tab imported" - it doesn't seem to be possible
to squelch this warning), and the definition of the tables
themselves produce a warning that can be squelched ("warning C4273:
'avpriv_mpa_bitrate_tab' : inconsistent dll linkage, see previous
definition of 'avpriv_mpa_bitrate_tab').
In this setup, mingw isn't able to link object files that refer to
data symbols with __declspec(dllimport) without those symbols
actually being linked via a DLL (linking avcodec.dll ends up with
errors like "undefined reference to `__imp__avpriv_mpa_freq_tab'").
The dllimport declspec isn't needed at all in mingw, so we simply
choose not to declare it for other compilers than MSVC that requires
it. (If ICL support later requires it, the condition can be extended
later to include both of them.)
This also implies that code that is built to link to a certain
library as a DLL can't link to the same library as a static library.
Therefore, we only allow building either static or shared but not
both at the same time. (That is, static libraries as such can be,
and actually are, built - this is used for linking the test tools to
internal symbols in the libraries - but e.g. libavformat built to
link to libavcodec as a DLL cannot link statically to libavcodec.)
Also, linking to DLLs is slightly different from linking to shared
libraries on other platforms. DLLs use a thing called import
libraries, which is basically a stub library allowing the linker
to know which symbols exist in the DLL and what name the DLL will
have at runtime.
In mingw/gcc, the import library is usually named libfoo.dll.a,
which goes next to a static library named libfoo.a. This allows
gcc to pick the dynamic one, if available, from the normal -lfoo
switches, just as it does for libfoo.a vs libfoo.so on Unix. On
MSVC however, you need to literally specify the name of the import
library instead of the static library.
Signed-off-by: Martin Storsjö <martin@martin.st>
12 years ago
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extern av_export const uint32_t avpriv_dca_sample_rates[16];
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extern const uint32_t ff_dca_sampling_freqs[16];
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extern const uint8_t ff_dca_freq_ranges[16];
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/**
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* Convert bitstream to one representation based on sync marker
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*/
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int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
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int max_size);
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#endif /* AVCODEC_DCA_H */
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