Initial commit of Monkey's Audio (.ape/.mac) support. Note that Monkey's is an extremely CPU-intensive codec, and that the decoding speed is directly related to the compression level (-c1000, -c2000, -c3000, -c4000 or -c5000) used when encoding the file. Current performance is: -c1000 to -c3000 are realtime on a Gigabeat, -c1000 is realtime on Coldfire targets (H100, H300 and Cowon), and nothing is realtime on PortalPlayer targets (iPods, H10, Sansa). Hopefully this can be improved. More information at FS #7256.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13562 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 137 insertions, 0 deletions

diff --git a/apps/codecs/demac/libdemac/parser.h b/apps/codecs/demac/libdemac/parser.h
new file mode 100644
index 0000000000..edf4222fd5
--- /dev/null
+++ b/apps/codecs/demac/libdemac/parser.h
@@ -0,0 +1,137 @@
+/*
+
+libdemac - A Monkey's Audio decoder
+
+$Id:$
+
+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>
+
+#ifdef ROCKBOX
+/* Include the Rockbox Codec API when building for Rockbox */
+#define APE_OUTPUT_DEPTH 29
+#ifndef ROCKBOX_PLUGIN
+#include "../lib/codeclib.h"
+#include <codecs.h>
+#endif
+#else
+#define APE_OUTPUT_DEPTH (ape_ctx->bps)
+#define IBSS_ATTR
+#define ICONST_ATTR
+#define ICODE_ATTR
+#endif
+
+/* 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_STEREO_SILENCE  3
+#define APE_FRAMECODE_PSEUDO_STEREO   4
+
+#define HISTORY_SIZE 512
+#define PREDICTOR_ORDER 8
+
+struct predictor_t
+{
+    /* Adaption co-efficients */
+    int32_t coeffsA[4];
+    int32_t coeffsB[5];
+
+    /* Filter histories */
+    int32_t historybuffer[HISTORY_SIZE + PREDICTOR_ORDER * 4];
+    int32_t* delayA;
+    int32_t* delayB;
+    int32_t* adaptcoeffsA;
+    int32_t* adaptcoeffsB;
+
+    int32_t lastA;
+
+    int32_t filterA;
+    int32_t filterB;
+};
+
+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;
+
+    /* Decoder state */
+    uint32_t      CRC;
+    int           frameflags;
+    int           currentframeblocks;
+    int           blocksdecoded;
+    struct predictor_t predictorY;
+    struct predictor_t predictorX;
+};
+
+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