VLC: include/vlc_codecs.h Source File

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00001 /*****************************************************************************
00002  * vlc_codecs.h: codec related structures needed by the demuxers and decoders
00003  *****************************************************************************
00004  * Copyright (C) 1999-2001 VLC authors and VideoLAN
00005  * $Id: 6daa57cf903cb8d564d5a7b9e9f1a387598e6b42 $
00006  *
00007  * Author: Gildas Bazin <gbazin@videolan.org>
00008  *
00009  * This program is free software; you can redistribute it and/or modify it
00010  * under the terms of the GNU Lesser General Public License as published by
00011  * the Free Software Foundation; either version 2.1 of the License, or
00012  * (at your option) any later version.
00013  *
00014  * This program is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
00017  * GNU Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public License
00020  * along with this program; if not, write to the Free Software Foundation,
00021  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
00022  *****************************************************************************/
00023 
00024 #ifndef VLC_CODECS_H
00025 #define VLC_CODECS_H 1
00026 
00027 #include <vlc_fourcc.h>
00028 /**
00029  * \file
00030  * This file defines codec related structures needed by the demuxers and decoders
00031  */
00032 
00033 /* Structures exported to the demuxers and decoders */
00034 
00035 #if !(defined _GUID_DEFINED || defined GUID_DEFINED)
00036 #define GUID_DEFINED
00037 typedef struct _GUID
00038 {
00039     uint32_t Data1;
00040     uint16_t Data2;
00041     uint16_t Data3;
00042     uint8_t  Data4[8];
00043 } GUID, *REFGUID, *LPGUID;
00044 #endif /* GUID_DEFINED */
00045 
00046 typedef GUID guid_t;
00047 
00048 #ifdef HAVE_ATTRIBUTE_PACKED
00049 #   define ATTR_PACKED __attribute__((__packed__))
00050 #elif defined(__SUNPRO_C)
00051 #   pragma pack(1)
00052 #   define ATTR_PACKED
00053 #elif defined(__APPLE__)
00054 #   pragma pack(push, 1)
00055 #   define ATTR_PACKED
00056 #else
00057 #   error FIXME
00058 #endif
00059 
00060 #ifndef _WAVEFORMATEX_
00061 #define _WAVEFORMATEX_
00062 typedef struct
00063 ATTR_PACKED
00064 _WAVEFORMATEX {
00065     uint16_t   wFormatTag;
00066     uint16_t   nChannels;
00067     uint32_t   nSamplesPerSec;
00068     uint32_t   nAvgBytesPerSec;
00069     uint16_t   nBlockAlign;
00070     uint16_t   wBitsPerSample;
00071     uint16_t   cbSize;
00072 } WAVEFORMATEX, *PWAVEFORMATEX, *NPWAVEFORMATEX, *LPWAVEFORMATEX;
00073 #endif /* _WAVEFORMATEX_ */
00074 
00075 #ifndef _WAVEFORMATEXTENSIBLE_
00076 #define _WAVEFORMATEXTENSIBLE_
00077 typedef struct
00078 ATTR_PACKED
00079 _WAVEFORMATEXTENSIBLE {
00080     WAVEFORMATEX Format;
00081     union {
00082         uint16_t wValidBitsPerSample;
00083         uint16_t wSamplesPerBlock;
00084         uint16_t wReserved;
00085     } Samples;
00086     uint32_t     dwChannelMask;
00087     GUID SubFormat;
00088 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
00089 #endif /* _WAVEFORMATEXTENSIBLE_ */
00090 
00091 #ifndef _WAVEHEADER_
00092 #define _WAVEHEADER_
00093 typedef struct
00094 ATTR_PACKED
00095 _WAVEHEADER {
00096     uint32_t MainChunkID;
00097     uint32_t Length;
00098     uint32_t ChunkTypeID;
00099     uint32_t SubChunkID;
00100     uint32_t SubChunkLength;
00101     uint16_t Format;
00102     uint16_t Modus;
00103     uint32_t SampleFreq;
00104     uint32_t BytesPerSec;
00105     uint16_t BytesPerSample;
00106     uint16_t BitsPerSample;
00107     uint32_t DataChunkID;
00108     uint32_t DataLength;
00109 } WAVEHEADER;
00110 #endif /* _WAVEHEADER_ */
00111 
00112 #ifndef _VLC_BITMAPINFOHEADER_
00113 #define _VLC_BITMAPINFOHEADER_
00114 
00115 typedef struct
00116 ATTR_PACKED
00117 {
00118     uint32_t   biSize;
00119     uint32_t   biWidth;
00120     uint32_t   biHeight;
00121     uint16_t   biPlanes;
00122     uint16_t   biBitCount;
00123     uint32_t   biCompression;
00124     uint32_t   biSizeImage;
00125     uint32_t   biXPelsPerMeter;
00126     uint32_t   biYPelsPerMeter;
00127     uint32_t   biClrUsed;
00128     uint32_t   biClrImportant;
00129 } VLC_BITMAPINFOHEADER, *VLC_PBITMAPINFOHEADER, *VLC_LPBITMAPINFOHEADER;
00130 
00131 typedef struct
00132 ATTR_PACKED
00133 {
00134     VLC_BITMAPINFOHEADER bmiHeader;
00135     int                  bmiColors[1];
00136 } VLC_BITMAPINFO, *VLC_LPBITMAPINFO;
00137 #endif
00138 
00139 #ifndef _RECT32_
00140 #define _RECT32_
00141 typedef struct
00142 ATTR_PACKED
00143 {
00144     int left, top, right, bottom;
00145 } RECT32;
00146 #endif
00147 
00148 #ifndef _REFERENCE_TIME_
00149 #define _REFERENCE_TIME_
00150 typedef int64_t REFERENCE_TIME;
00151 #endif
00152 
00153 #ifndef _VIDEOINFOHEADER_
00154 #define _VIDEOINFOHEADER_
00155 typedef struct
00156 ATTR_PACKED
00157 {
00158     RECT32                  rcSource;
00159     RECT32                  rcTarget;
00160     uint32_t                dwBitRate;
00161     uint32_t                dwBitErrorRate;
00162     REFERENCE_TIME          AvgTimePerFrame;
00163     VLC_BITMAPINFOHEADER    bmiHeader;
00164 } VIDEOINFOHEADER;
00165 #endif
00166 
00167 #ifndef _RGBQUAD_
00168 #define _RGBQUAD_
00169 typedef struct
00170 ATTR_PACKED
00171 {
00172     uint8_t rgbBlue;
00173     uint8_t rgbGreen;
00174     uint8_t rgbRed;
00175     uint8_t rgbReserved;
00176 } RGBQUAD1;
00177 #endif
00178 
00179 #ifndef _TRUECOLORINFO_
00180 #define _TRUECOLORINFO_
00181 typedef struct
00182 ATTR_PACKED
00183 {
00184     uint32_t dwBitMasks[3];
00185     RGBQUAD1 bmiColors[256];
00186 } TRUECOLORINFO;
00187 #endif
00188 
00189 #ifndef _VIDEOINFO_
00190 #define _VIDEOINFO_
00191 typedef struct
00192 ATTR_PACKED
00193 {
00194     RECT32                  rcSource;
00195     RECT32                  rcTarget;
00196     uint32_t                dwBitRate;
00197     uint32_t                dwBitErrorRate;
00198     REFERENCE_TIME          AvgTimePerFrame;
00199     VLC_BITMAPINFOHEADER    bmiHeader;
00200 
00201     union
00202     {
00203         RGBQUAD1 bmiColors[256]; /* Colour palette */
00204         uint32_t dwBitMasks[3]; /* True colour masks */
00205         TRUECOLORINFO TrueColorInfo; /* Both of the above */
00206     };
00207 
00208 } VIDEOINFO;
00209 #endif
00210 
00211 #if defined(__SUNPRO_C)
00212 #   pragma pack()
00213 #elif defined(__APPLE__) && !HAVE_ATTRIBUTE_PACKED
00214 #   pragma pack(pop)
00215 #endif
00216 
00217 /* WAVE format wFormatTag IDs */
00218 /* See http://msdn.microsoft.com/en-us/library/aa904731%28v=vs.80%29.aspx */
00219 #define WAVE_FORMAT_UNKNOWN             0x0000 /* Microsoft Corporation */
00220 #define WAVE_FORMAT_PCM                 0x0001 /* Microsoft Corporation */
00221 #define WAVE_FORMAT_ADPCM               0x0002 /* Microsoft Corporation */
00222 #define WAVE_FORMAT_IEEE_FLOAT          0x0003 /* Microsoft Corporation */
00223 #define WAVE_FORMAT_ALAW                0x0006 /* Microsoft Corporation */
00224 #define WAVE_FORMAT_MULAW               0x0007 /* Microsoft Corporation */
00225 #define WAVE_FORMAT_DTS_MS              0x0008 /* Microsoft Corporation */
00226 #define WAVE_FORMAT_WMAS                0x000a /* WMA 9 Speech */
00227 #define WAVE_FORMAT_IMA_ADPCM           0x0011 /* Intel Corporation */
00228 #define WAVE_FORMAT_YAMAHA_ADPCM        0x0020 /* Yamaha */
00229 #define WAVE_FORMAT_TRUESPEECH          0x0022 /* TrueSpeech */
00230 #define WAVE_FORMAT_GSM610              0x0031 /* Microsoft Corporation */
00231 #define WAVE_FORMAT_MSNAUDIO            0x0032 /* Microsoft Corporation */
00232 #define WAVE_FORMAT_G726                0x0045 /* ITU-T standard  */
00233 #define WAVE_FORMAT_MPEG                0x0050 /* Microsoft Corporation */
00234 #define WAVE_FORMAT_MPEGLAYER3          0x0055 /* ISO/MPEG Layer3 Format Tag */
00235 #define WAVE_FORMAT_AMR_NB              0x0057 /* AMR NB */
00236 #define WAVE_FORMAT_AMR_WB              0x0058 /* AMR Wideband */
00237 #define WAVE_FORMAT_DOLBY_AC3_SPDIF     0x0092 /* Sonic Foundry */
00238 
00239 #define WAVE_FORMAT_AAC                 0x00FF /* */
00240 #define WAVE_FORMAT_SIPRO               0x0130 /* Sipro Lab Telecom Inc. */
00241 
00242 #define WAVE_FORMAT_WMA1                0x0160 /* WMA version 1 */
00243 #define WAVE_FORMAT_WMA2                0x0161 /* WMA (v2) 7, 8, 9 Series */
00244 #define WAVE_FORMAT_WMAP                0x0162 /* WMA 9 Professional */
00245 #define WAVE_FORMAT_WMAL                0x0163 /* WMA 9 Lossless */
00246 
00247 #define WAVE_FORMAT_ATRAC3              0x0270 /* Atrac3, != from MSDN doc */
00248 #define WAVE_FORMAT_SONY_ATRAC3         0x0272 /* Atrac3, != from MSDN doc */
00249 
00250 #define WAVE_FORMAT_AAC_2               0x1601 /* Other AAC */
00251 #define WAVE_FORMAT_AAC_LATM            0x1602 /* AAC/LATM */
00252 
00253 #define WAVE_FORMAT_A52                 0x2000 /* a52 */
00254 #define WAVE_FORMAT_DTS                 0x2001 /* DTS */
00255 #define WAVE_FORMAT_FFMPEG_AAC          0x706D
00256 #define WAVE_FORMAT_DIVIO_AAC           0x4143 /* Divio's AAC */
00257 
00258 /* Need to check these */
00259 #define WAVE_FORMAT_DK3                 0x0061
00260 #define WAVE_FORMAT_DK4                 0x0062
00261 
00262 /* At least FFmpeg use that ID: from libavformat/riff.c ('Vo' == 0x566f)
00263  * { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
00264  */
00265 #define WAVE_FORMAT_VORBIS              0x566f
00266 
00267 /* It seems that these IDs are used by braindead & obsolete VorbisACM encoder
00268  * (Windows only)
00269  * A few info is available except VorbisACM source (remember, Windows only)
00270  * (available on http://svn.xiph.org), but it seems that vo3+ at least is
00271  * made of Vorbis data encapsulated in Ogg container...
00272  */
00273 #define WAVE_FORMAT_VORB_1              0x674f
00274 #define WAVE_FORMAT_VORB_2              0x6750
00275 #define WAVE_FORMAT_VORB_3              0x6751
00276 #define WAVE_FORMAT_VORB_1PLUS          0x676f
00277 #define WAVE_FORMAT_VORB_2PLUS          0x6770
00278 #define WAVE_FORMAT_VORB_3PLUS          0x6771
00279 
00280 #define WAVE_FORMAT_SPEEX               0xa109 /* Speex audio */
00281 #define WAVE_FORMAT_FLAC                0xf1ac /* Xiph Flac */
00282 
00283 #if !defined(WAVE_FORMAT_EXTENSIBLE)
00284   #define WAVE_FORMAT_EXTENSIBLE          0xFFFE /* Microsoft */
00285 #endif
00286 
00287 /* GUID SubFormat IDs */
00288 /* We need both b/c const variables are not compile-time constants in C, giving
00289  * us an error if we use the const GUID in an enum */
00290 
00291 #ifndef _KSDATAFORMAT_SUBTYPE_PCM_
00292 #define _KSDATAFORMAT_SUBTYPE_PCM_ {0x00000001, 0x0000, 0x0010, {0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}}
00293 static const GUID VLC_KSDATAFORMAT_SUBTYPE_PCM = {0xE923AABF, 0xCB58, 0x4471, {0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62}};
00294 #define KSDATAFORMAT_SUBTYPE_PCM VLC_KSDATAFORMAT_SUBTYPE_PCM
00295 #endif
00296 
00297 #ifndef _KSDATAFORMAT_SUBTYPE_UNKNOWN_
00298 #define _KSDATAFORMAT_SUBTYPE_UNKNOWN_ {0x00000000, 0x0000, 0x0000, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}
00299 static const GUID VLC_KSDATAFORMAT_SUBTYPE_UNKNOWN = {0x00000000, 0x0000, 0x0000, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}};
00300 #define KSDATAFORMAT_SUBTYPE_UNKNOWN VLC_KSDATAFORMAT_SUBTYPE_UNKNOWN
00301 #endif
00302 
00303 /* Microsoft speaker definitions */
00304 #define WAVE_SPEAKER_FRONT_LEFT             0x1
00305 #define WAVE_SPEAKER_FRONT_RIGHT            0x2
00306 #define WAVE_SPEAKER_FRONT_CENTER           0x4
00307 #define WAVE_SPEAKER_LOW_FREQUENCY          0x8
00308 #define WAVE_SPEAKER_BACK_LEFT              0x10
00309 #define WAVE_SPEAKER_BACK_RIGHT             0x20
00310 #define WAVE_SPEAKER_FRONT_LEFT_OF_CENTER   0x40
00311 #define WAVE_SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
00312 #define WAVE_SPEAKER_BACK_CENTER            0x100
00313 #define WAVE_SPEAKER_SIDE_LEFT              0x200
00314 #define WAVE_SPEAKER_SIDE_RIGHT             0x400
00315 #define WAVE_SPEAKER_TOP_CENTER             0x800
00316 #define WAVE_SPEAKER_TOP_FRONT_LEFT         0x1000
00317 #define WAVE_SPEAKER_TOP_FRONT_CENTER       0x2000
00318 #define WAVE_SPEAKER_TOP_FRONT_RIGHT        0x4000
00319 #define WAVE_SPEAKER_TOP_BACK_LEFT          0x8000
00320 #define WAVE_SPEAKER_TOP_BACK_CENTER        0x10000
00321 #define WAVE_SPEAKER_TOP_BACK_RIGHT         0x20000
00322 #define WAVE_SPEAKER_RESERVED               0x80000000
00323 
00324 static const struct
00325 {
00326     uint16_t     i_tag;
00327     vlc_fourcc_t i_fourcc;
00328     const char  *psz_name;
00329 }
00330 wave_format_tag_to_fourcc[] =
00331 {
00332     { WAVE_FORMAT_PCM,        VLC_FOURCC( 'a', 'r', 'a', 'w' ), "Raw audio" },
00333     { WAVE_FORMAT_PCM,        VLC_CODEC_S8,                     "PCM S8 audio" },
00334     { WAVE_FORMAT_PCM,        VLC_CODEC_S16L,                   "PCM S16L audio" },
00335     { WAVE_FORMAT_PCM,        VLC_CODEC_S24L,                   "PCM S24L audio" },
00336     { WAVE_FORMAT_PCM,        VLC_CODEC_S32L,                   "PCM S32L audio" },
00337     { WAVE_FORMAT_ADPCM,      VLC_CODEC_ADPCM_MS,               "ADPCM" },
00338     { WAVE_FORMAT_IEEE_FLOAT, VLC_FOURCC( 'a', 'f', 'l', 't' ), "IEEE Float audio" },
00339     { WAVE_FORMAT_IEEE_FLOAT, VLC_CODEC_F32L,                   "PCM 32 (Float) audio" },
00340     { WAVE_FORMAT_IEEE_FLOAT, VLC_CODEC_F64L,                   "PCM 64 (Float) audio" },
00341     { WAVE_FORMAT_ALAW,       VLC_CODEC_ALAW,                   "A-Law" },
00342     { WAVE_FORMAT_MULAW,      VLC_CODEC_MULAW,                  "Mu-Law" },
00343     { WAVE_FORMAT_IMA_ADPCM,  VLC_CODEC_ADPCM_IMA_WAV,          "Ima-ADPCM" },
00344     { WAVE_FORMAT_YAMAHA_ADPCM, VLC_CODEC_ADPCM_YAMAHA,         "Yamaha ADPCM" },
00345     { WAVE_FORMAT_TRUESPEECH, VLC_FOURCC(0x22, 0x0, 0x0, 0x0 ), "Truespeech" },
00346     { WAVE_FORMAT_GSM610,     VLC_CODEC_GSM_MS,                 "Microsoft WAV GSM" },
00347     { WAVE_FORMAT_G726,       VLC_CODEC_ADPCM_G726,             "G.726 ADPCM" },
00348     { WAVE_FORMAT_MPEGLAYER3, VLC_CODEC_MPGA,                   "Mpeg Audio" },
00349     { WAVE_FORMAT_MPEG,       VLC_CODEC_MPGA,                   "Mpeg Audio" },
00350     { WAVE_FORMAT_AMR_NB,     VLC_CODEC_AMR_NB,                 "AMR NB" },
00351     { WAVE_FORMAT_AMR_WB,     VLC_CODEC_AMR_WB,                 "AMR Wideband" },
00352     { WAVE_FORMAT_SIPRO,      VLC_CODEC_SIPR,                   "Sipr Audio" },
00353     { WAVE_FORMAT_A52,        VLC_CODEC_A52,                    "A/52" },
00354     { WAVE_FORMAT_WMA1,       VLC_CODEC_WMA1,                   "Window Media Audio v1" },
00355     { WAVE_FORMAT_WMA2,       VLC_CODEC_WMA2,                   "Window Media Audio v2" },
00356     { WAVE_FORMAT_WMAP,       VLC_CODEC_WMAP,                   "Window Media Audio 9 Professional" },
00357     { WAVE_FORMAT_WMAL,       VLC_CODEC_WMAL,                   "Window Media Audio 9 Lossless" },
00358     { WAVE_FORMAT_WMAS,       VLC_CODEC_WMAS,                   "Window Media Audio 9 Speech" },
00359     { WAVE_FORMAT_ATRAC3,     VLC_CODEC_ATRAC3,                 "Sony Atrac3" },
00360     { WAVE_FORMAT_SONY_ATRAC3,VLC_CODEC_ATRAC3,                 "Sony Atrac3" },
00361     { WAVE_FORMAT_DK3,        VLC_FOURCC( 'm', 's', 0x00,0x61), "Duck DK3" },
00362     { WAVE_FORMAT_DK4,        VLC_FOURCC( 'm', 's', 0x00,0x62), "Duck DK4" },
00363     { WAVE_FORMAT_DTS,        VLC_CODEC_DTS,                    "DTS Coherent Acoustics" },
00364     { WAVE_FORMAT_DTS_MS,     VLC_CODEC_DTS,                    "DTS Coherent Acoustics" },
00365     { WAVE_FORMAT_DIVIO_AAC,  VLC_CODEC_MP4A,                   "MPEG-4 Audio (Divio)" },
00366     { WAVE_FORMAT_AAC,        VLC_CODEC_MP4A,                   "MPEG-4 Audio" },
00367     { WAVE_FORMAT_AAC_2,      VLC_CODEC_MP4A,                   "MPEG-4 Audio" },
00368     { WAVE_FORMAT_AAC_LATM,   VLC_CODEC_MP4A,                   "MPEG-4 Audio" },
00369     { WAVE_FORMAT_FFMPEG_AAC, VLC_CODEC_MP4A,                   "MPEG-4 Audio" },
00370     { WAVE_FORMAT_VORBIS,     VLC_CODEC_VORBIS,                 "Vorbis Audio" },
00371     { WAVE_FORMAT_VORB_1,     VLC_FOURCC( 'v', 'o', 'r', '1' ), "Vorbis 1 Audio" },
00372     { WAVE_FORMAT_VORB_1PLUS, VLC_FOURCC( 'v', 'o', '1', '+' ), "Vorbis 1+ Audio" },
00373     { WAVE_FORMAT_VORB_2,     VLC_FOURCC( 'v', 'o', 'r', '2' ), "Vorbis 2 Audio" },
00374     { WAVE_FORMAT_VORB_2PLUS, VLC_FOURCC( 'v', 'o', '2', '+' ), "Vorbis 2+ Audio" },
00375     { WAVE_FORMAT_VORB_3,     VLC_FOURCC( 'v', 'o', 'r', '3' ), "Vorbis 3 Audio" },
00376     { WAVE_FORMAT_VORB_3PLUS, VLC_FOURCC( 'v', 'o', '3', '+' ), "Vorbis 3+ Audio" },
00377     { WAVE_FORMAT_SPEEX,      VLC_CODEC_SPEEX,                  "Speex Audio" },
00378     { WAVE_FORMAT_FLAC,       VLC_CODEC_FLAC,                   "FLAC Audio" },
00379     { WAVE_FORMAT_UNKNOWN,    VLC_FOURCC( 'u', 'n', 'd', 'f' ), "Unknown" }
00380 };
00381 
00382 static inline void wf_tag_to_fourcc( uint16_t i_tag, vlc_fourcc_t *fcc,
00383                                      const char **ppsz_name )
00384 {
00385     int i;
00386     for( i = 0; wave_format_tag_to_fourcc[i].i_tag != 0; i++ )
00387     {
00388         if( wave_format_tag_to_fourcc[i].i_tag == i_tag ) break;
00389     }
00390     if( fcc ) *fcc = wave_format_tag_to_fourcc[i].i_fourcc;
00391     if( ppsz_name ) *ppsz_name = wave_format_tag_to_fourcc[i].psz_name;
00392 }
00393 
00394 static inline void fourcc_to_wf_tag( vlc_fourcc_t fcc, uint16_t *pi_tag )
00395 {
00396     int i;
00397     for( i = 0; wave_format_tag_to_fourcc[i].i_tag != 0; i++ )
00398     {
00399         if( wave_format_tag_to_fourcc[i].i_fourcc == fcc ) break;
00400     }
00401     if( pi_tag ) *pi_tag = wave_format_tag_to_fourcc[i].i_tag;
00402 }
00403 
00404 /* If wFormatTag is WAVEFORMATEXTENSIBLE, we must look at the SubFormat tag
00405  * to determine the actual format.  Microsoft has stopped giving out wFormatTag
00406  * assignments in lieu of letting 3rd parties generate their own GUIDs
00407  */
00408 static const struct
00409 {
00410     GUID         guid_tag;
00411     vlc_fourcc_t i_fourcc;
00412     const char  *psz_name;
00413 }
00414 sub_format_tag_to_fourcc[] =
00415 {
00416     { _KSDATAFORMAT_SUBTYPE_PCM_, VLC_FOURCC( 'p', 'c', 'm', ' ' ), "PCM" },
00417     { _KSDATAFORMAT_SUBTYPE_UNKNOWN_, VLC_FOURCC( 'u', 'n', 'd', 'f' ), "Unknown" }
00418 };
00419 
00420 /* compares two GUIDs, returns 1 if identical, 0 otherwise */
00421 static inline int guidcmp( const GUID *s1, const GUID *s2 )
00422 {
00423     return( s1->Data1 == s2->Data1 && s1->Data2 == s2->Data2 &&
00424             s1->Data3 == s2->Data3 && !memcmp( s1->Data4, s2->Data4, 8 ) );
00425 }
00426 
00427 static inline void sf_tag_to_fourcc( GUID *guid_tag,
00428                                      vlc_fourcc_t *fcc, const char **ppsz_name )
00429 {
00430     int i;
00431 
00432     for( i = 0; !guidcmp( &sub_format_tag_to_fourcc[i].guid_tag,
00433                           &KSDATAFORMAT_SUBTYPE_UNKNOWN ); i++ )
00434     {
00435         if( guidcmp( &sub_format_tag_to_fourcc[i].guid_tag, guid_tag ) ) break;
00436     }
00437     if( fcc ) *fcc = sub_format_tag_to_fourcc[i].i_fourcc;
00438     if( ppsz_name ) *ppsz_name = sub_format_tag_to_fourcc[i].psz_name;
00439 }
00440 
00441 #endif /* "codecs.h" */