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core: track current chapter for relative chapter seeks

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Due to inexact seeks, chapter seek commands may result in a playback
position that's inside the previous chapter. This causes problems when
the user does repeated next-chapter/previous-chapter seeks, because
the code will use the wrong base for calculating 'next' or
'previous'. Improve the behavior by adding a heuristic that keeps
track of what chapter the user last wanted to seek to and adjusts the
"current chapter" value based on that.
This commit is contained in:
Uoti Urpala 2010-04-25 23:20:34 +03:00
parent 823b989f0f
commit d2e25a90c4
2 changed files with 25 additions and 4 deletions
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6
mp_core.h
View File

@ -154,6 +154,12 @@ typedef struct MPContext {
double rel_seek_secs;
int abs_seek_pos;
/* Heuristic for relative chapter seeks: keep track which chapter
* the user wanted to go to, even if we aren't exactly within the
* boundaries of that chapter due to an inaccurate seek. */
int last_chapter_seek;
double last_chapter_pts;
float begin_skip; ///< start time of the current skip while on edlout mode
// audio is muted if either EDL or user activates mute
short edl_muted; ///< Stores whether EDL is currently in muted mode.

23
mplayer.c
View File

@ -2750,6 +2750,10 @@ static int seek(MPContext *mpctx, double amount, int style)
current_module = "seek";
if (mpctx->stop_play == AT_END_OF_FILE)
mpctx->stop_play = KEEP_PLAYING;
if (style & SEEK_FACTOR
|| style & SEEK_ABSOLUTE && amount < mpctx->last_chapter_pts
|| amount < 0)
mpctx->last_chapter_seek = -1;
if (mpctx->timeline && style & SEEK_FACTOR) {
amount *= mpctx->timeline[mpctx->num_timeline_parts].start;
style &= ~SEEK_FACTOR;
@ -2795,14 +2799,15 @@ static int seek(MPContext *mpctx, double amount, int style)
int get_current_chapter(struct MPContext *mpctx)
{
if (!mpctx->chapters || !mpctx->sh_video)
return demuxer_get_current_chapter(mpctx->demuxer);
return FFMAX(mpctx->last_chapter_seek,
demuxer_get_current_chapter(mpctx->demuxer));
int i;
double current_pts = mpctx->sh_video->pts;
for (i = 1; i < mpctx->num_chapters; i++)
if (current_pts < mpctx->chapters[i].start)
break;
return i - 1;
return FFMAX(mpctx->last_chapter_seek, i - 1);
}
// currently returns a string allocated with malloc, not talloc
@ -2816,11 +2821,18 @@ char *chapter_display_name(struct MPContext *mpctx, int chapter)
int seek_chapter(struct MPContext *mpctx, int chapter, double *seek_pts,
char **chapter_name)
{
mpctx->last_chapter_seek = -1;
if (!mpctx->chapters || !mpctx->sh_video) {
int res = demuxer_seek_chapter(mpctx->demuxer, chapter, seek_pts,
chapter_name);
if (res >= 0 && *seek_pts == -1)
seek_reset(mpctx);
if (res >= 0) {
if (*seek_pts == -1)
seek_reset(mpctx);
else {
mpctx->last_chapter_seek = res;
mpctx->last_chapter_pts = *seek_pts;
}
}
return res;
}
@ -2829,6 +2841,8 @@ int seek_chapter(struct MPContext *mpctx, int chapter, double *seek_pts,
if (chapter < 0)
chapter = 0;
*seek_pts = mpctx->chapters[chapter].start;
mpctx->last_chapter_seek = chapter;
mpctx->last_chapter_pts = *seek_pts;
if (chapter_name)
*chapter_name = talloc_strdup(NULL, mpctx->chapters[chapter].name);
return chapter;
@ -4085,6 +4099,7 @@ if (mpctx->stream->type == STREAMTYPE_DVDNAV) {
mpctx->drop_message_shown = 0;
mpctx->update_video_immediately = true;
mpctx->total_avsync_change = 0;
mpctx->last_chapter_seek = -1;
// Make sure VO knows current pause state
if (mpctx->sh_video)
vo_control(mpctx->video_out, mpctx->paused ? VOCTRL_PAUSE : VOCTRL_RESUME,