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implement smooth seeking acceleration for audio playback and mpegplayer

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17843 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Marcoen Hirschberg 2008-06-28 17:55:53 +00:00
parent bcf9b5dfa6
commit 2fb70bcabb
4 changed files with 78 additions and 20 deletions
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14
apps/gui/gwps-common.c
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@ -196,10 +196,10 @@ bool ffwd_rew(int button)
unsigned int max_step = 0; /* maximum ff/rewind step */
int ff_rewind_count = 0; /* current ff/rewind count (in ticks) */
int direction = -1; /* forward=1 or backward=-1 */
long accel_tick = 0; /* next time at which to bump the step size */
bool exit = false;
bool usb = false;
int i = 0;
const long ff_rw_accel = (global_settings.ff_rewind_accel + 3);
if (button == ACTION_NONE)
{
@ -237,13 +237,8 @@ bool ffwd_rew(int button)
ff_rewind_count += step * direction;
if (global_settings.ff_rewind_accel != 0 &&
current_tick >= accel_tick)
{
step *= 2;
accel_tick = current_tick +
global_settings.ff_rewind_accel*HZ;
}
/* smooth seeking by multiplying step by: 1 + (2 ^ -accel) */
step += step >> ff_rw_accel;
}
else
{
@ -268,9 +263,6 @@ bool ffwd_rew(int button)
wps_state.ff_rewind = true;
step = 1000 * global_settings.ff_rewind_min_step;
accel_tick = current_tick +
global_settings.ff_rewind_accel*HZ;
}
else
break;