1 files changed, 357 insertions, 0 deletions

diff --git a/apps/codecs/demac/libdemac/parser.c b/apps/codecs/demac/libdemac/parser.c
new file mode 100644
index 0000000000..bcb542dbb6
--- /dev/null
+++ b/apps/codecs/demac/libdemac/parser.c
@@ -0,0 +1,357 @@
+/*
+
+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
+
+*/
+
+#include <inttypes.h>
+#include <string.h>
+#ifndef ROCKBOX
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#endif
+
+#include "parser.h"
+
+
+static inline int16_t get_int16(unsigned char* buf)
+{
+    return(buf[0] | (buf[1] << 8));
+}
+
+static inline uint16_t get_uint16(unsigned char* buf)
+{
+    return(buf[0] | (buf[1] << 8));
+}
+
+static inline uint32_t get_uint32(unsigned char* buf)
+{
+    return(buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24));
+}
+
+
+int ape_parseheaderbuf(unsigned char* buf, struct ape_ctx_t* ape_ctx)
+{
+    unsigned char* header;
+
+    memset(ape_ctx,0,sizeof(struct ape_ctx_t));
+    /* TODO: Skip any leading junk such as id3v2 tags */
+    ape_ctx->junklength = 0;
+
+    memcpy(ape_ctx->magic, buf, 4);
+    if (memcmp(ape_ctx->magic,"MAC ",4)!=0)
+    {
+        return -1;
+    }
+
+    ape_ctx->fileversion = get_int16(buf + 4);
+
+    if (ape_ctx->fileversion >= 3980)
+    {
+    ape_ctx->padding1 = get_int16(buf + 6);
+    ape_ctx->descriptorlength = get_uint32(buf + 8);
+    ape_ctx->headerlength = get_uint32(buf + 12);
+    ape_ctx->seektablelength = get_uint32(buf + 16);
+    ape_ctx->wavheaderlength = get_uint32(buf + 20);
+    ape_ctx->audiodatalength = get_uint32(buf + 24);
+    ape_ctx->audiodatalength_high = get_uint32(buf + 28);
+    ape_ctx->wavtaillength = get_uint32(buf + 32);
+    memcpy(ape_ctx->md5, buf + 36, 16);
+
+    header = buf + ape_ctx->descriptorlength;
+
+    /* Read header data */
+    ape_ctx->compressiontype = get_uint16(header + 0);
+    ape_ctx->formatflags = get_uint16(header + 2);
+    ape_ctx->blocksperframe = get_uint32(header + 4);
+    ape_ctx->finalframeblocks = get_uint32(header + 8);
+    ape_ctx->totalframes = get_uint32(header + 12);
+    ape_ctx->bps = get_uint16(header + 16);
+    ape_ctx->channels = get_uint16(header + 18);
+    ape_ctx->samplerate = get_uint32(header + 20);
+
+    ape_ctx->firstframe = ape_ctx->junklength + ape_ctx->descriptorlength +
+                           ape_ctx->headerlength + ape_ctx->seektablelength +
+                           ape_ctx->wavheaderlength;
+    } else {
+        ape_ctx->compressiontype = get_uint16(buf + 6);
+        ape_ctx->formatflags = get_uint16(buf + 8);
+        ape_ctx->channels = get_uint16(buf + 10);
+        ape_ctx->samplerate = get_uint32(buf + 14);
+        ape_ctx->wavheaderlength = get_uint32(buf + 18);
+        ape_ctx->totalframes = get_uint32(buf + 26);
+        ape_ctx->finalframeblocks = get_uint32(buf + 30);
+    }
+
+    ape_ctx->totalsamples = ape_ctx->finalframeblocks;
+    if (ape_ctx->totalframes > 1)
+        ape_ctx->totalsamples += ape_ctx->blocksperframe * (ape_ctx->totalframes-1);
+
+    /* TODO: Parse and store seektable */
+
+    return 0;
+}
+
+
+#ifndef ROCKBOX
+/* Helper functions */
+
+static int read_uint16(int fd, uint16_t* x)
+{
+    unsigned char tmp[2];
+    int n;
+
+    n = read(fd,tmp,2);
+
+    if (n != 2)
+        return -1;
+
+    *x = tmp[0] | (tmp[1] << 8);
+
+    return 0;
+}
+
+static int read_int16(int fd, int16_t* x)
+{
+    return read_uint16(fd, (uint16_t*)x);
+}
+
+static int read_uint32(int fd, uint32_t* x)
+{
+    unsigned char tmp[4];
+    int n;
+
+    n = read(fd,tmp,4);
+
+    if (n != 4)
+        return -1;
+
+    *x = tmp[0] | (tmp[1] << 8) | (tmp[2] << 16) | (tmp[3] << 24);
+
+    return 0;
+}
+
+int ape_parseheader(int fd, struct ape_ctx_t* ape_ctx)
+{
+    int i,n;
+
+    /* TODO: Skip any leading junk such as id3v2 tags */
+    ape_ctx->junklength = 0;
+
+    lseek(fd,ape_ctx->junklength,SEEK_SET);
+
+    n = read(fd,&ape_ctx->magic,4);
+    if (n != 4) return -1;
+
+    if (memcmp(ape_ctx->magic,"MAC ",4)!=0)
+    {
+        return -1;
+    }
+
+    if (read_int16(fd,&ape_ctx->fileversion) < 0)
+        return -1;
+
+    if (ape_ctx->fileversion >= 3980)
+    {
+        if (read_int16(fd,&ape_ctx->padding1) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->descriptorlength) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->headerlength) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->seektablelength) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->wavheaderlength) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->audiodatalength) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->audiodatalength_high) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->wavtaillength) < 0)
+            return -1;
+        if (read(fd,&ape_ctx->md5,16) != 16)
+            return -1;
+
+        /* Skip any unknown bytes at the end of the descriptor.  This is for future
+           compatibility */
+        if (ape_ctx->descriptorlength > 52)
+            lseek(fd,ape_ctx->descriptorlength - 52, SEEK_CUR);
+
+        /* Read header data */
+        if (read_uint16(fd,&ape_ctx->compressiontype) < 0)
+            return -1;
+        if (read_uint16(fd,&ape_ctx->formatflags) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->blocksperframe) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->finalframeblocks) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->totalframes) < 0)
+            return -1;
+        if (read_uint16(fd,&ape_ctx->bps) < 0)
+            return -1;
+        if (read_uint16(fd,&ape_ctx->channels) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->samplerate) < 0)
+            return -1;
+    } else {
+        ape_ctx->descriptorlength = 0;
+        ape_ctx->headerlength = 32;
+
+        if (read_uint16(fd,&ape_ctx->compressiontype) < 0)
+            return -1;
+        if (read_uint16(fd,&ape_ctx->formatflags) < 0)
+            return -1;
+        if (read_uint16(fd,&ape_ctx->channels) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->samplerate) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->wavheaderlength) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->wavtaillength) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->totalframes) < 0)
+            return -1;
+        if (read_uint32(fd,&ape_ctx->finalframeblocks) < 0)
+            return -1;
+
+        if (ape_ctx->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL)
+        {
+            lseek(fd, 4, SEEK_CUR);   /* Skip the peak level */
+            ape_ctx->headerlength += 4;
+        }
+
+        if (ape_ctx->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS)
+        {
+            if (read_uint32(fd,&ape_ctx->seektablelength) < 0)
+                return -1;
+            ape_ctx->headerlength += 4;
+            ape_ctx->seektablelength *= sizeof(int32_t);
+        } else {
+            ape_ctx->seektablelength = ape_ctx->totalframes * sizeof(int32_t);
+        }
+
+        if (ape_ctx->formatflags & MAC_FORMAT_FLAG_8_BIT)
+            ape_ctx->bps = 8;
+        else if (ape_ctx->formatflags & MAC_FORMAT_FLAG_24_BIT)
+            ape_ctx->bps = 24;
+        else
+            ape_ctx->bps = 16;
+
+        if (ape_ctx->fileversion >= 3950)
+            ape_ctx->blocksperframe = 73728 * 4;
+        else if ((ape_ctx->fileversion >= 3900) || (ape_ctx->fileversion >= 3800 && ape_ctx->compressiontype >= 4000))
+            ape_ctx->blocksperframe = 73728;
+        else
+            ape_ctx->blocksperframe = 9216;
+
+        /* Skip any stored wav header */
+        if (!(ape_ctx->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
+        {
+            lseek(fd, ape_ctx->wavheaderlength, SEEK_CUR);
+        }
+    }
+
+    ape_ctx->totalsamples = ape_ctx->finalframeblocks;
+    if (ape_ctx->totalframes > 1)
+        ape_ctx->totalsamples += ape_ctx->blocksperframe * (ape_ctx->totalframes-1);
+
+    if (ape_ctx->seektablelength > 0)
+    {
+        ape_ctx->seektable = malloc(ape_ctx->seektablelength);
+        if (ape_ctx->seektable == NULL)
+            return -1;
+        for (i=0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++)
+        {
+            if (read_uint32(fd,&ape_ctx->seektable[i]) < 0)
+            {
+                 free(ape_ctx->seektable);
+                 return -1;
+            }
+        }
+    }
+
+    ape_ctx->firstframe = ape_ctx->junklength + ape_ctx->descriptorlength +
+                           ape_ctx->headerlength + ape_ctx->seektablelength +
+                           ape_ctx->wavheaderlength;
+
+    return 0;
+}
+
+void ape_dumpinfo(struct ape_ctx_t* ape_ctx)
+{
+  int i;
+
+    printf("Descriptor Block:\n\n");
+    printf("magic                = \"%c%c%c%c\"\n",
+            ape_ctx->magic[0],ape_ctx->magic[1],
+            ape_ctx->magic[2],ape_ctx->magic[3]);
+    printf("fileversion          = %d\n",ape_ctx->fileversion);
+    printf("descriptorlength     = %d\n",ape_ctx->descriptorlength);
+    printf("headerlength         = %d\n",ape_ctx->headerlength);
+    printf("seektablelength      = %d\n",ape_ctx->seektablelength);
+    printf("wavheaderlength      = %d\n",ape_ctx->wavheaderlength);
+    printf("audiodatalength      = %d\n",ape_ctx->audiodatalength);
+    printf("audiodatalength_high = %d\n",ape_ctx->audiodatalength_high);
+    printf("wavtaillength        = %d\n",ape_ctx->wavtaillength);
+    printf("md5                  = ");
+    for (i = 0; i < 16; i++)
+        printf("%02x",ape_ctx->md5[i]);
+    printf("\n");
+
+    printf("\nHeader Block:\n\n");
+
+    printf("compressiontype      = %d\n",ape_ctx->compressiontype);
+    printf("formatflags          = %d\n",ape_ctx->formatflags);
+    printf("blocksperframe       = %d\n",ape_ctx->blocksperframe);
+    printf("finalframeblocks     = %d\n",ape_ctx->finalframeblocks);
+    printf("totalframes          = %d\n",ape_ctx->totalframes);
+    printf("bps                  = %d\n",ape_ctx->bps);
+    printf("channels             = %d\n",ape_ctx->channels);
+    printf("samplerate           = %d\n",ape_ctx->samplerate);
+
+    printf("\nSeektable\n\n");
+    if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes)
+    {
+        printf("No seektable\n");
+    }
+    else
+    {
+        for ( i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t) ; i++)
+        {
+            if (i < ape_ctx->totalframes-1) {
+                printf("%8d   %d (%d bytes)\n",i,ape_ctx->seektable[i],ape_ctx->seektable[i+1]-ape_ctx->seektable[i]);
+            } else {
+                printf("%8d   %d\n",i,ape_ctx->seektable[i]);
+            }
+        }
+    }
+    printf("\nCalculated information:\n\n");
+    printf("junklength           = %d\n",ape_ctx->junklength);
+    printf("firstframe           = %d\n",ape_ctx->firstframe);
+    printf("totalsamples         = %d\n",ape_ctx->totalsamples);
+}
+
+#endif /* !ROCKBOX */