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not yet correct (nw)

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This commit is contained in:
David Haywood 2015-10-28 19:35:16 +00:00
parent 7bc764f3fd
commit 5bafdbf6b4
1 changed files with 49 additions and 6 deletions
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55
src/lib/formats/tzx_cas.c
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@ -335,14 +335,14 @@ static int tzx_handle_direct(INT16 **buffer, const UINT8 *bytes, int pause, int
}
static int tzx_handle_symbol(INT16 **buffer, const UINT8 *symtable, UINT8 symbol, int maxp)
INLINE int tzx_handle_symbol(INT16 **buffer, const UINT8 *symtable, UINT8 symbol, int maxp)
{
int size = 0;
const UINT8 *cursymb = symtable + (2 * maxp + 1)*symbol;
UINT8 starttype = cursymb[0];
printf("start polarity %01x (max number of symbols is %d)\n", starttype, maxp);
// printf("start polarity %01x (max number of symbols is %d)\n", starttype, maxp);
switch (starttype)
{
@ -376,6 +376,8 @@ static int tzx_handle_symbol(INT16 **buffer, const UINT8 *symtable, UINT8 symbol
// shorter lists can be terminated with a pulse_length of 0
if (pulse_length != 0)
{
int samples = tcycles_to_samplecount(pulse_length);
tzx_output_wave(buffer, samples);
size += samples;
@ -384,16 +386,39 @@ static int tzx_handle_symbol(INT16 **buffer, const UINT8 *symtable, UINT8 symbol
}
else
{
toggle_wave_data(); // ?
toggle_wave_data();
i = maxp;
continue;
}
}
//toggle_wave_data();
return size;
}
INLINE int stream_get_bit(const UINT8 *bytes, UINT8 &stream_bit, UINT32 &stream_byte)
{
// get bit here
UINT8 retbit = 0;
UINT8 byte = bytes[stream_byte];
byte = byte << stream_bit;
if (byte & 0x80) retbit = 1;
stream_bit++;
if (stream_bit == 8)
{
stream_bit = 0;
stream_byte++;
}
return retbit;
}
static int tzx_handle_generalized(INT16 **buffer, const UINT8 *bytes, int pause, int data_size, UINT32 totp, int npp, int asp, UINT32 totd, int npd, int asd )
{
int size = 0;
@ -415,6 +440,7 @@ static int tzx_handle_generalized(INT16 **buffer, const UINT8 *bytes, int pause,
for (int j = 0; j < repetitions; j++)
{
size += tzx_handle_symbol(buffer, symtable, symbol, npp);
// toggle_wave_data();
}
@ -430,13 +456,30 @@ static int tzx_handle_generalized(INT16 **buffer, const UINT8 *bytes, int pause,
if (totd > 0)
{
printf("data block table %04x\n", totd);
printf("data block table %04x (has %0d symbols, max symbol length is %d)\n", totd, asd, npd);
// const UINT8 *symtable = bytes;
// const UINT8 *table2 = bytes + (2 * npd + 1)*asd;
const UINT8 *symtable = bytes;
const UINT8 *table2 = bytes + (2 * npd + 1)*asd;
int NB = ceil(compute_log2(asd)); // number of bits needed to represent each symbol
printf("NB is %d\n", NB);
UINT8 stream_bit = 0;
UINT32 stream_byte = 0;
for (int i = 0; i < totd; i++)
{
UINT8 symbol = 0;
for (int j = 0; j < NB; j++)
{
symbol |= stream_get_bit(table2, stream_bit, stream_byte) << j;
}
size += tzx_handle_symbol(buffer, symtable, symbol, npd);
//toggle_wave_data();
}
}
else
{