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Faster, 8-bit bitswap by Magnus Holmgren

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1819 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2002-08-20 14:22:11 +00:00
parent ef3a3e7093
commit bfc8d0ac44
3 changed files with 104 additions and 61 deletions
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62
firmware/mpeg.c
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@ -35,6 +35,8 @@
#include "file.h"
#endif
extern void bitswap(unsigned short *data, int length);
#define MPEG_CHUNKSIZE 0x180000
#define MPEG_SWAP_CHUNKSIZE 0x8000
#define MPEG_HIGH_WATER 2
@ -347,44 +349,6 @@ static unsigned int prescale_table[] =
};
#endif
static unsigned char fliptable[] =
{
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
static unsigned short big_fliptable[65536];
static struct event_queue mpeg_queue;
static char mpeg_stack[DEFAULT_STACK_SIZE + 0x1000];
static char mpeg_thread_name[] = "mpeg";
@ -407,16 +371,6 @@ static bool filling; /* We are filling the buffer with data from disk */
static int mpeg_file;
static void create_fliptable(void)
{
int i;
for(i = 0;i < 65536;i++)
{
big_fliptable[i] = fliptable[i & 0xff] | (fliptable[i >> 8] << 8);
}
}
static void mas_poll_start(int interval_in_ms)
{
unsigned int count;
@ -518,16 +472,6 @@ static void dma_tick(void)
}
}
static void bitswap(unsigned short *data, int length) __attribute__ ((section (".icode")));
static void bitswap(unsigned short *data, int length)
{
int i = length;
while(i--)
{
data[i] = big_fliptable[data[i]];
}
}
static void reset_mp3_buffer(void)
{
mp3buf_read = 0;
@ -1621,8 +1565,6 @@ void mpeg_init(int volume, int bass, int treble, int balance, int loudness, int
mp3buflen = mp3end - mp3buf;
create_fliptable();
queue_init(&mpeg_queue);
create_thread(mpeg_thread, mpeg_stack,
sizeof(mpeg_stack), mpeg_thread_name);