50a6ca39ad
This is to a) to cleanup firmware/common and firmware/include a bit, but also b) for Rockbox as an application which should use the host system's c library and headers, separating makes it easy to exclude our files from the build. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25850 a1c6a512-1295-4272-9138-f99709370657
402 lines
13 KiB
C
402 lines
13 KiB
C
/*
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libdemac - A Monkey's Audio decoder
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$Id$
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Copyright (C) Dave Chapman 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
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*/
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#include <inttypes.h>
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#include <string.h>
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#ifndef ROCKBOX
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#include <stdio.h>
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#include <stdlib.h>
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#include "inttypes.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#endif
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#include "parser.h"
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#ifdef APE_MAX
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#undef APE_MAX
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#endif
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#define APE_MAX(a,b) ((a)>(b)?(a):(b))
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static inline int16_t get_int16(unsigned char* buf)
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{
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return(buf[0] | (buf[1] << 8));
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}
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static inline uint16_t get_uint16(unsigned char* buf)
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{
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return(buf[0] | (buf[1] << 8));
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}
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static inline uint32_t get_uint32(unsigned char* buf)
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{
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return(buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24));
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}
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int ape_parseheaderbuf(unsigned char* buf, struct ape_ctx_t* ape_ctx)
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{
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unsigned char* header;
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memset(ape_ctx,0,sizeof(struct ape_ctx_t));
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/* TODO: Skip any leading junk such as id3v2 tags */
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ape_ctx->junklength = 0;
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memcpy(ape_ctx->magic, buf, 4);
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if (memcmp(ape_ctx->magic,"MAC ",4)!=0)
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{
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return -1;
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}
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ape_ctx->fileversion = get_int16(buf + 4);
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if (ape_ctx->fileversion >= 3980)
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{
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ape_ctx->padding1 = get_int16(buf + 6);
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ape_ctx->descriptorlength = get_uint32(buf + 8);
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ape_ctx->headerlength = get_uint32(buf + 12);
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ape_ctx->seektablelength = get_uint32(buf + 16);
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ape_ctx->wavheaderlength = get_uint32(buf + 20);
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ape_ctx->audiodatalength = get_uint32(buf + 24);
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ape_ctx->audiodatalength_high = get_uint32(buf + 28);
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ape_ctx->wavtaillength = get_uint32(buf + 32);
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memcpy(ape_ctx->md5, buf + 36, 16);
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header = buf + ape_ctx->descriptorlength;
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/* Read header data */
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ape_ctx->compressiontype = get_uint16(header + 0);
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ape_ctx->formatflags = get_uint16(header + 2);
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ape_ctx->blocksperframe = get_uint32(header + 4);
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ape_ctx->finalframeblocks = get_uint32(header + 8);
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ape_ctx->totalframes = get_uint32(header + 12);
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ape_ctx->bps = get_uint16(header + 16);
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ape_ctx->channels = get_uint16(header + 18);
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ape_ctx->samplerate = get_uint32(header + 20);
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ape_ctx->seektablefilepos = ape_ctx->junklength +
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ape_ctx->descriptorlength +
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ape_ctx->headerlength;
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ape_ctx->firstframe = ape_ctx->junklength + ape_ctx->descriptorlength +
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ape_ctx->headerlength + ape_ctx->seektablelength +
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ape_ctx->wavheaderlength;
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} else {
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ape_ctx->headerlength = 32;
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ape_ctx->compressiontype = get_uint16(buf + 6);
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ape_ctx->formatflags = get_uint16(buf + 8);
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ape_ctx->channels = get_uint16(buf + 10);
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ape_ctx->samplerate = get_uint32(buf + 12);
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ape_ctx->wavheaderlength = get_uint32(buf + 16);
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ape_ctx->totalframes = get_uint32(buf + 24);
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ape_ctx->finalframeblocks = get_uint32(buf + 28);
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if (ape_ctx->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL)
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{
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ape_ctx->headerlength += 4;
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}
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if (ape_ctx->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS)
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{
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ape_ctx->seektablelength = get_uint32(buf + ape_ctx->headerlength);
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ape_ctx->seektablelength *= sizeof(int32_t);
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ape_ctx->headerlength += 4;
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} else {
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ape_ctx->seektablelength = ape_ctx->totalframes * sizeof(int32_t);
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}
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if (ape_ctx->formatflags & MAC_FORMAT_FLAG_8_BIT)
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ape_ctx->bps = 8;
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else if (ape_ctx->formatflags & MAC_FORMAT_FLAG_24_BIT)
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ape_ctx->bps = 24;
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else
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ape_ctx->bps = 16;
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if (ape_ctx->fileversion >= 3950)
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ape_ctx->blocksperframe = 73728 * 4;
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else if ((ape_ctx->fileversion >= 3900) || (ape_ctx->fileversion >= 3800 && ape_ctx->compressiontype >= 4000))
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ape_ctx->blocksperframe = 73728;
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else
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ape_ctx->blocksperframe = 9216;
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ape_ctx->seektablefilepos = ape_ctx->junklength + ape_ctx->headerlength +
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ape_ctx->wavheaderlength;
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ape_ctx->firstframe = ape_ctx->junklength + ape_ctx->headerlength +
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ape_ctx->wavheaderlength + ape_ctx->seektablelength;
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}
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ape_ctx->totalsamples = ape_ctx->finalframeblocks;
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if (ape_ctx->totalframes > 1)
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ape_ctx->totalsamples += ape_ctx->blocksperframe * (ape_ctx->totalframes-1);
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ape_ctx->numseekpoints = APE_MAX(ape_ctx->maxseekpoints,
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ape_ctx->seektablelength / sizeof(int32_t));
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return 0;
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}
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#ifndef ROCKBOX
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/* Helper functions */
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static int read_uint16(int fd, uint16_t* x)
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{
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unsigned char tmp[2];
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int n;
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n = read(fd,tmp,2);
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if (n != 2)
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return -1;
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*x = tmp[0] | (tmp[1] << 8);
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return 0;
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}
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static int read_int16(int fd, int16_t* x)
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{
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return read_uint16(fd, (uint16_t*)x);
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}
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static int read_uint32(int fd, uint32_t* x)
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{
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unsigned char tmp[4];
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int n;
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n = read(fd,tmp,4);
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if (n != 4)
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return -1;
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*x = tmp[0] | (tmp[1] << 8) | (tmp[2] << 16) | (tmp[3] << 24);
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return 0;
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}
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int ape_parseheader(int fd, struct ape_ctx_t* ape_ctx)
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{
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int i,n;
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/* TODO: Skip any leading junk such as id3v2 tags */
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ape_ctx->junklength = 0;
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lseek(fd,ape_ctx->junklength,SEEK_SET);
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n = read(fd,&ape_ctx->magic,4);
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if (n != 4) return -1;
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if (memcmp(ape_ctx->magic,"MAC ",4)!=0)
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{
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return -1;
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}
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if (read_int16(fd,&ape_ctx->fileversion) < 0)
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return -1;
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if (ape_ctx->fileversion >= 3980)
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{
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if (read_int16(fd,&ape_ctx->padding1) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->descriptorlength) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->headerlength) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->seektablelength) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->wavheaderlength) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->audiodatalength) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->audiodatalength_high) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->wavtaillength) < 0)
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return -1;
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if (read(fd,&ape_ctx->md5,16) != 16)
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return -1;
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/* Skip any unknown bytes at the end of the descriptor. This is for future
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compatibility */
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if (ape_ctx->descriptorlength > 52)
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lseek(fd,ape_ctx->descriptorlength - 52, SEEK_CUR);
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/* Read header data */
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if (read_uint16(fd,&ape_ctx->compressiontype) < 0)
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return -1;
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if (read_uint16(fd,&ape_ctx->formatflags) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->blocksperframe) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->finalframeblocks) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->totalframes) < 0)
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return -1;
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if (read_uint16(fd,&ape_ctx->bps) < 0)
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return -1;
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if (read_uint16(fd,&ape_ctx->channels) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->samplerate) < 0)
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return -1;
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} else {
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ape_ctx->descriptorlength = 0;
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ape_ctx->headerlength = 32;
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if (read_uint16(fd,&ape_ctx->compressiontype) < 0)
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return -1;
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if (read_uint16(fd,&ape_ctx->formatflags) < 0)
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return -1;
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if (read_uint16(fd,&ape_ctx->channels) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->samplerate) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->wavheaderlength) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->wavtaillength) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->totalframes) < 0)
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return -1;
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if (read_uint32(fd,&ape_ctx->finalframeblocks) < 0)
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return -1;
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if (ape_ctx->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL)
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{
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lseek(fd, 4, SEEK_CUR); /* Skip the peak level */
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ape_ctx->headerlength += 4;
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}
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if (ape_ctx->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS)
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{
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if (read_uint32(fd,&ape_ctx->seektablelength) < 0)
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return -1;
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ape_ctx->headerlength += 4;
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ape_ctx->seektablelength *= sizeof(int32_t);
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} else {
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ape_ctx->seektablelength = ape_ctx->totalframes * sizeof(int32_t);
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}
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if (ape_ctx->formatflags & MAC_FORMAT_FLAG_8_BIT)
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ape_ctx->bps = 8;
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else if (ape_ctx->formatflags & MAC_FORMAT_FLAG_24_BIT)
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ape_ctx->bps = 24;
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else
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ape_ctx->bps = 16;
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if (ape_ctx->fileversion >= 3950)
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ape_ctx->blocksperframe = 73728 * 4;
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else if ((ape_ctx->fileversion >= 3900) || (ape_ctx->fileversion >= 3800 && ape_ctx->compressiontype >= 4000))
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ape_ctx->blocksperframe = 73728;
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else
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ape_ctx->blocksperframe = 9216;
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/* Skip any stored wav header */
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if (!(ape_ctx->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
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{
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lseek(fd, ape_ctx->wavheaderlength, SEEK_CUR);
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}
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}
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ape_ctx->totalsamples = ape_ctx->finalframeblocks;
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if (ape_ctx->totalframes > 1)
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ape_ctx->totalsamples += ape_ctx->blocksperframe * (ape_ctx->totalframes-1);
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if (ape_ctx->seektablelength > 0)
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{
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ape_ctx->seektable = malloc(ape_ctx->seektablelength);
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if (ape_ctx->seektable == NULL)
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return -1;
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for (i=0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++)
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{
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if (read_uint32(fd,&ape_ctx->seektable[i]) < 0)
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{
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free(ape_ctx->seektable);
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return -1;
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}
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}
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}
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ape_ctx->firstframe = ape_ctx->junklength + ape_ctx->descriptorlength +
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ape_ctx->headerlength + ape_ctx->seektablelength +
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ape_ctx->wavheaderlength;
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return 0;
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}
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void ape_dumpinfo(struct ape_ctx_t* ape_ctx)
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{
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int i;
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printf("Descriptor Block:\n\n");
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printf("magic = \"%c%c%c%c\"\n",
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ape_ctx->magic[0],ape_ctx->magic[1],
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ape_ctx->magic[2],ape_ctx->magic[3]);
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printf("fileversion = %d\n",ape_ctx->fileversion);
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printf("descriptorlength = %d\n",ape_ctx->descriptorlength);
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printf("headerlength = %d\n",ape_ctx->headerlength);
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printf("seektablelength = %d\n",ape_ctx->seektablelength);
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printf("wavheaderlength = %d\n",ape_ctx->wavheaderlength);
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printf("audiodatalength = %d\n",ape_ctx->audiodatalength);
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printf("audiodatalength_high = %d\n",ape_ctx->audiodatalength_high);
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printf("wavtaillength = %d\n",ape_ctx->wavtaillength);
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printf("md5 = ");
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for (i = 0; i < 16; i++)
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printf("%02x",ape_ctx->md5[i]);
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printf("\n");
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printf("\nHeader Block:\n\n");
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printf("compressiontype = %d\n",ape_ctx->compressiontype);
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printf("formatflags = %d\n",ape_ctx->formatflags);
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printf("blocksperframe = %d\n",ape_ctx->blocksperframe);
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printf("finalframeblocks = %d\n",ape_ctx->finalframeblocks);
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printf("totalframes = %d\n",ape_ctx->totalframes);
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printf("bps = %d\n",ape_ctx->bps);
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printf("channels = %d\n",ape_ctx->channels);
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printf("samplerate = %d\n",ape_ctx->samplerate);
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printf("\nSeektable\n\n");
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if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes)
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{
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printf("No seektable\n");
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}
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else
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{
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for ( i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t) ; i++)
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{
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if (i < ape_ctx->totalframes-1) {
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printf("%8d %d (%d bytes)\n",i,ape_ctx->seektable[i],ape_ctx->seektable[i+1]-ape_ctx->seektable[i]);
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} else {
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printf("%8d %d\n",i,ape_ctx->seektable[i]);
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}
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}
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}
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printf("\nCalculated information:\n\n");
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printf("junklength = %d\n",ape_ctx->junklength);
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printf("firstframe = %d\n",ape_ctx->firstframe);
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printf("totalsamples = %d\n",ape_ctx->totalsamples);
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}
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#endif /* !ROCKBOX */
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