fixed apedec (mac plugin) license; moved libdemac; started work on demac plugin

1 files changed, 137 insertions, 0 deletions

diff --git a/plugins/demac/libdemac/parser.h b/plugins/demac/libdemac/parser.h
new file mode 100644
index 00000000..0cfa665d
--- /dev/null
+++ b/plugins/demac/libdemac/parser.h
@@ -0,0 +1,137 @@
+/*
+
+libdemac - A Monkey's Audio decoder
+
+$Id: parser.h 19552 2008-12-21 23:49:02Z amiconn $
+
+Copyright (C) Dave Chapman 2007
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
+
+*/
+
+#ifndef _APE_PARSER_H
+#define _APE_PARSER_H
+
+#include <inttypes.h>
+#include "demac_config.h"
+
+/* The earliest and latest file formats supported by this library */
+#define APE_MIN_VERSION 3970
+#define APE_MAX_VERSION 3990
+
+#define MAC_FORMAT_FLAG_8_BIT                 1    // is 8-bit [OBSOLETE]
+#define MAC_FORMAT_FLAG_CRC                   2    // uses the new CRC32 error detection [OBSOLETE]
+#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL        4    // uint32 nPeakLevel after the header [OBSOLETE]
+#define MAC_FORMAT_FLAG_24_BIT                8    // is 24-bit [OBSOLETE]
+#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS    16    // has the number of seek elements after the peak level
+#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER    32    // create the wave header on decompression (not stored)
+
+
+/* Special frame codes:
+
+   MONO_SILENCE - All PCM samples in frame are zero (mono streams only)
+   LEFT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
+   RIGHT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
+   PSEUDO_STEREO - Left and Right channels are identical
+
+*/
+
+#define APE_FRAMECODE_MONO_SILENCE    1
+#define APE_FRAMECODE_LEFT_SILENCE    1 /* same as mono */
+#define APE_FRAMECODE_RIGHT_SILENCE   2
+#define APE_FRAMECODE_STEREO_SILENCE  3 /* combined */
+#define APE_FRAMECODE_PSEUDO_STEREO   4
+
+#define PREDICTOR_ORDER 8
+/* Total size of all predictor histories - 50 * sizeof(int32_t) */
+#define PREDICTOR_SIZE 50
+
+
+/* NOTE: This struct is used in predictor-arm.S - any updates need to
+   be reflected there. */
+
+struct predictor_t
+{
+    /* Filter histories */
+    int32_t* buf;
+
+    int32_t YlastA;
+    int32_t XlastA;
+
+    /* NOTE: The order of the next four fields is important for
+       predictor-arm.S */
+    int32_t YfilterB;
+    int32_t XfilterA;
+    int32_t XfilterB;
+    int32_t YfilterA;
+
+    /* Adaption co-efficients */
+    int32_t YcoeffsA[4];
+    int32_t XcoeffsA[4];
+    int32_t YcoeffsB[5];
+    int32_t XcoeffsB[5];
+    int32_t historybuffer[PREDICTOR_HISTORY_SIZE + PREDICTOR_SIZE];
+};
+
+struct ape_ctx_t
+{
+    /* Derived fields */
+    uint32_t      junklength;
+    uint32_t      firstframe;
+    uint32_t      totalsamples;
+
+    /* Info from Descriptor Block */
+    char          magic[4];
+    int16_t       fileversion;
+    int16_t       padding1;
+    uint32_t      descriptorlength;
+    uint32_t      headerlength;
+    uint32_t      seektablelength;
+    uint32_t      wavheaderlength;
+    uint32_t      audiodatalength;
+    uint32_t      audiodatalength_high;
+    uint32_t      wavtaillength;
+    uint8_t       md5[16];
+
+    /* Info from Header Block */
+    uint16_t      compressiontype;
+    uint16_t      formatflags;
+    uint32_t      blocksperframe;
+    uint32_t      finalframeblocks;
+    uint32_t      totalframes;
+    uint16_t      bps;
+    uint16_t      channels;
+    uint32_t      samplerate;
+
+    /* Seektable */
+    uint32_t*     seektable;        /* Seektable buffer */
+    uint32_t      maxseekpoints;    /* Max seekpoints we can store (size of seektable buffer) */
+    uint32_t      numseekpoints;    /* Number of seekpoints */
+    int           seektablefilepos; /* Location in .ape file of seektable */
+
+    /* Decoder state */
+    uint32_t      CRC;
+    int           frameflags;
+    int           currentframeblocks;
+    int           blocksdecoded;
+    struct predictor_t predictor;
+};
+
+int ape_parseheader(int fd, struct ape_ctx_t* ape_ctx);
+int ape_parseheaderbuf(unsigned char* buf, struct ape_ctx_t* ape_ctx);
+void ape_dumpinfo(struct ape_ctx_t* ape_ctx);
+
+#endif