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CDROM: Implement fast forward/rewind

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This commit is contained in:
Connor McLaughlin 2020-10-29 20:57:10 +10:00
parent 29467d40c8
commit a6947fbc70
2 changed files with 58 additions and 1 deletions
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55
src/core/cdrom.cpp
View file

@ -198,6 +198,10 @@ bool CDROM::DoState(StateWrapper& sw)
sw.Do(&m_last_cdda_report_frame_nibble);
sw.Do(&m_play_track_number_bcd);
sw.Do(&m_async_command_parameter);
// TODO: Uncomment on the next save state version bump.
//sw.Do(&m_fast_forward_rate);
sw.Do(&m_cd_audio_volume_matrix);
sw.Do(&m_next_cd_audio_volume_matrix);
sw.Do(&m_xa_last_samples);
@ -228,6 +232,7 @@ bool CDROM::DoState(StateWrapper& sw)
m_reader.QueueReadSector(requested_sector);
UpdateCommandEvent();
m_drive_event->SetState(!IsDriveIdle());
m_fast_forward_rate = 0;
}
return !sw.HasError();
@ -946,6 +951,7 @@ void CDROM::ExecuteCommand()
(m_drive_state == DriveState::Playing || (IsSeeking() && m_play_after_seek)))
{
Log_DevPrintf("Ignoring play command with no/same setloc, already playing/playing after seek");
m_fast_forward_rate = 0;
}
else
{
@ -960,6 +966,48 @@ void CDROM::ExecuteCommand()
return;
}
case Command::Forward:
{
if (m_drive_state != DriveState::Playing || !CanReadMedia())
{
SendErrorResponse(STAT_ERROR, ERROR_REASON_NOT_READY);
}
else
{
SendACKAndStat();
if (m_fast_forward_rate < 0)
m_fast_forward_rate = 0;
m_fast_forward_rate += static_cast<s8>(FAST_FORWARD_RATE_STEP);
m_fast_forward_rate = std::min<s8>(m_fast_forward_rate, static_cast<s8>(MAX_FAST_FORWARD_RATE));
}
EndCommand();
return;
}
case Command::Backward:
{
if (m_drive_state != DriveState::Playing || !CanReadMedia())
{
SendErrorResponse(STAT_ERROR, ERROR_REASON_NOT_READY);
}
else
{
SendACKAndStat();
if (m_fast_forward_rate > 0)
m_fast_forward_rate = 0;
m_fast_forward_rate -= static_cast<s8>(FAST_FORWARD_RATE_STEP);
m_fast_forward_rate = std::max<s8>(m_fast_forward_rate, -static_cast<s8>(MAX_FAST_FORWARD_RATE));
}
EndCommand();
return;
}
case Command::Pause:
{
if (m_secondary_status.seeking)
@ -1392,6 +1440,7 @@ void CDROM::BeginPlaying(u8 track_bcd, TickCount ticks_late /* = 0 */, bool afte
Log_DebugPrintf("Starting playing CDDA track %x", track_bcd);
m_last_cdda_report_frame_nibble = 0xFF;
m_play_track_number_bcd = track_bcd;
m_fast_forward_rate = 0;
// if track zero, start from current position
if (track_bcd != 0)
@ -1779,6 +1828,7 @@ void CDROM::DoSectorRead()
ProcessDataSectorHeader(m_reader.GetSectorBuffer().data());
}
u32 next_sector = m_current_lba + 1u;
if (is_data_sector && m_drive_state == DriveState::Reading)
{
ProcessDataSector(m_reader.GetSectorBuffer().data(), subq);
@ -1787,6 +1837,9 @@ void CDROM::DoSectorRead()
(m_drive_state == DriveState::Playing || (m_drive_state == DriveState::Reading && m_mode.cdda)))
{
ProcessCDDASector(m_reader.GetSectorBuffer().data(), subq);
if (m_fast_forward_rate != 0)
next_sector = m_current_lba + SignExtend32(m_fast_forward_rate);
}
else if (m_drive_state != DriveState::Reading && m_drive_state != DriveState::Playing)
{
@ -1798,7 +1851,7 @@ void CDROM::DoSectorRead()
is_data_sector ? "data" : "audio", is_data_sector ? "reading" : "playing");
}
m_reader.QueueReadSector(m_current_lba + 1u);
m_reader.QueueReadSector(next_sector);
}
void CDROM::ProcessDataSectorHeader(const u8* raw_sector)

4
src/core/cdrom.h
View file

@ -69,6 +69,9 @@ private:
AUDIO_FIFO_LOW_WATERMARK = 5,
BASE_RESET_TICKS = 400000,
MAX_FAST_FORWARD_RATE = 12,
FAST_FORWARD_RATE_STEP = 4
};
static constexpr u8 INTERRUPT_REGISTER_MASK = 0x1F;
@ -314,6 +317,7 @@ private:
u8 m_last_cdda_report_frame_nibble = 0xFF;
u8 m_play_track_number_bcd = 0xFF;
u8 m_async_command_parameter = 0x00;
s8 m_fast_forward_rate = 0;
std::array<std::array<u8, 2>, 2> m_cd_audio_volume_matrix{};
std::array<std::array<u8, 2>, 2> m_next_cd_audio_volume_matrix{};