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Merge pull request #5345 from AmatCoder/AmatCoder-tzx_cas-3

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tzx_cas.cpp: Fix pulses on Standard Data blocks
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ajrhacker 2019-07-14 18:15:37 -04:00 committed by GitHub
commit 8202a700c2
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1 changed files with 3 additions and 17 deletions
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20
src/lib/formats/tzx_cas.cpp
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@ -25,18 +25,6 @@ TODO:
case 0x34: Emulation info
case 0x40: Snapshot block
Notes:
TZX format specification lists
8064 pulses for a header block and 3220 for a data block
but the documentation on worldofspectrum lists
8063 pulses for a header block and 3223 for a data block
see http://www.worldofspectrum.org/faq/reference/48kreference.htm#TapeDataStructure
We are currently using the numbers from the TZX specification...
*/
#include <assert.h>
@ -537,7 +525,7 @@ static int tzx_cas_do_work( int16_t **buffer )
case 0x10: /* Standard Speed Data Block (.TAP block) */
pause_time = cur_block[1] + (cur_block[2] << 8);
data_size = cur_block[3] + (cur_block[4] << 8);
pilot_length = (cur_block[5] == 0x00) ? 8064 : 3220;
pilot_length = (cur_block[5] < 128) ? 8063 : 3223;
size += tzx_cas_handle_block(buffer, &cur_block[5], pause_time, data_size, 2168, pilot_length, 667, 735, 855, 1710, 8);
current_block++;
break;
@ -815,8 +803,7 @@ static int tap_cas_to_wav_size( const uint8_t *casdata, int caslen )
while (p < casdata + caslen)
{
int data_size = p[0] + (p[1] << 8);
int pilot_length = (p[2] == 0x00) ? 8064 : 3220; /* TZX specification */
// int pilot_length = (p[2] == 0x00) ? 8063 : 3223; /* worldofspectrum */
int pilot_length = (p[2] == 0x00) ? 8063 : 3223;
LOG_FORMATS("tap_cas_to_wav_size: Handling TAP block containing 0x%X bytes", data_size);
p += 2;
size += tzx_cas_handle_block(nullptr, p, 1000, data_size, 2168, pilot_length, 667, 735, 855, 1710, 8);
@ -834,8 +821,7 @@ static int tap_cas_fill_wave( int16_t *buffer, int length, uint8_t *bytes )
while (size < length)
{
int data_size = bytes[0] + (bytes[1] << 8);
int pilot_length = (bytes[2] == 0x00) ? 8064 : 3220; /* TZX specification */
// int pilot_length = (bytes[2] == 0x00) ? 8063 : 3223; /* worldofspectrum */
int pilot_length = (bytes[2] == 0x00) ? 8063 : 3223;
LOG_FORMATS("tap_cas_fill_wave: Handling TAP block containing 0x%X bytes\n", data_size);
bytes += 2;
size += tzx_cas_handle_block(&p, bytes, 1000, data_size, 2168, pilot_length, 667, 735, 855, 1710, 8);