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Made an effort to support zoned tracks, at least.

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This commit is contained in:
Thomas Harte 2016-07-10 18:07:53 -04:00
parent ada2f073e0
commit 19ee430d4a
1 changed files with 27 additions and 2 deletions
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29
Storage/Disk/Formats/G64.cpp
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@ -36,6 +36,8 @@ G64::G64(const char *file_name)
_number_of_tracks = (uint8_t)fgetc(_file);
_maximum_track_size = (uint16_t)fgetc(_file);
_maximum_track_size |= (uint16_t)fgetc(_file) << 8;
get_track_at_position(0);
}
G64::~G64()
@ -105,13 +107,36 @@ std::shared_ptr<Track> G64::get_track_at_position(unsigned int position)
uint8_t speed_zone_contents[speed_zone_length];
fread(speed_zone_contents, 1, speed_zone_length, _file);
// TODO: divide into individual PCMSegments (per byte, if necessary), shove into a PCMTrack
// divide track into appropriately timed PCMSegments
std::vector<PCMSegment> segments;
unsigned int current_speed = speed_zone_contents[0] >> 6;
unsigned int start_byte_in_current_speed = 0;
for(unsigned int byte = 0; byte < track_length; byte ++)
{
unsigned int byte_speed = speed_zone_contents[byte >> 2] >> (6 - (byte&3)*2);
if(byte_speed != current_speed || byte == (track_length-1))
{
unsigned int number_of_bytes = byte - start_byte_in_current_speed;
PCMSegment segment;
segment.duration.length = number_of_bytes * 8;
segment.duration.clock_rate = current_speed;
segment.data.reset(new uint8_t[number_of_bytes]);
memcpy(segment.data.get(), &track_contents.get()[start_byte_in_current_speed], number_of_bytes);
segments.push_back(std::move(segment));
current_speed = byte_speed;
start_byte_in_current_speed = byte;
}
}
resulting_track.reset(new PCMTrack(std::move(segments)));
}
else
{
PCMSegment segment;
segment.duration.length = track_length * 8;
segment.duration.clock_rate = track_length * 8;
segment.duration.clock_rate = 1; // this is arbitrary; if supplying only one PCMSegment then it'll naturally fill the track
segment.data = std::move(track_contents);
resulting_track.reset(new PCMTrack(std::move(segment)));