Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/apps/codecs/demac/libdemac/parser.c

357 lines
11 KiB
C
Raw Blame History

/*
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 */
Reference in a new issue View git blame Copy permalink