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player: simplify mp_seek()

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wm4 2016-02-28 19:43:07 +01:00
parent 92ba630796
commit 9001083685
1 changed files with 46 additions and 55 deletions
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131
player/playloop.c
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@ -185,7 +185,7 @@ static int mp_seek(MPContext *mpctx, struct seek_params seek)
{
struct MPOpts *opts = mpctx->opts;
if (!mpctx->demuxer)
if (!mpctx->demuxer || seek.type == MPSEEK_NONE || seek.amount == MP_NOPTS_VALUE)
return -1;
if (!mpctx->demuxer->seekable) {
@ -193,108 +193,99 @@ static int mp_seek(MPContext *mpctx, struct seek_params seek)
return -1;
}
if (mpctx->stop_play == AT_END_OF_FILE)
mpctx->stop_play = KEEP_PLAYING;
double hr_seek_offset = opts->hr_seek_demuxer_offset;
bool hr_seek_very_exact = seek.exact == MPSEEK_VERY_EXACT;
double current_time = get_current_time(mpctx);
if (current_time == MP_NOPTS_VALUE)
current_time = 0;
double seek_pts = MP_NOPTS_VALUE;
int demux_flags = 0;
switch (seek.type) {
case MPSEEK_ABSOLUTE:
seek_pts = seek.amount;
break;
case MPSEEK_BACKSTEP:
seek_pts = current_time;
hr_seek_very_exact = true;
break;
case MPSEEK_RELATIVE:
demux_flags = seek.amount > 0 ? SEEK_FORWARD : SEEK_BACKWARD;
seek_pts = current_time + seek.amount;
break;
case MPSEEK_FACTOR: ;
double len = get_time_length(mpctx);
if (len >= 0)
seek_pts = seek.amount * len;
demux_flags = seek_pts > current_time ? SEEK_FORWARD : SEEK_BACKWARD;
break;
default: abort();
}
double demux_pts = seek_pts;
bool hr_seek = opts->correct_pts && seek.exact != MPSEEK_KEYFRAME &&
((opts->hr_seek == 0 && seek.type == MPSEEK_ABSOLUTE) ||
opts->hr_seek > 0 || seek.exact >= MPSEEK_EXACT) &&
seek_pts != MP_NOPTS_VALUE;
if (seek.type == MPSEEK_FACTOR || seek.amount < 0 ||
(seek.type == MPSEEK_ABSOLUTE && seek.amount < mpctx->last_chapter_pts))
mpctx->last_chapter_seek = -2;
// Under certain circumstances, prefer SEEK_FACTOR.
if (seek.type == MPSEEK_FACTOR && !hr_seek &&
(mpctx->demuxer->ts_resets_possible || seek_pts == MP_NOPTS_VALUE))
{
demux_pts = seek.amount;
demux_flags |= SEEK_FACTOR;
}
if (hr_seek) {
double hr_seek_offset = opts->hr_seek_demuxer_offset;
// Always try to compensate for possibly bad demuxers in "special"
// situations where we need more robustness from the hr-seek code, even
// if the user doesn't use --hr-seek-demuxer-offset.
// The value is arbitrary, but should be "good enough" in most situations.
if (hr_seek_very_exact)
hr_seek_offset = MPMAX(hr_seek_offset, 0.5); // arbitrary
double target_time = MP_NOPTS_VALUE;
int direction = 0;
bool backstep = false;
switch (seek.type) {
case MPSEEK_ABSOLUTE:
target_time = seek.amount;
break;
case MPSEEK_BACKSTEP:
seek.type = MPSEEK_ABSOLUTE;
seek.amount = get_current_time(mpctx);
if (seek.amount == MP_NOPTS_VALUE)
seek.amount = 0;
target_time = seek.amount;
backstep = true;
break;
case MPSEEK_RELATIVE:
direction = seek.amount > 0 ? 1 : -1;
double cur = get_current_time(mpctx);
target_time = seek.amount + (cur == MP_NOPTS_VALUE ? 0 : cur);
break;
case MPSEEK_FACTOR: ;
double len = get_time_length(mpctx);
if (len >= 0)
target_time = seek.amount * len;
break;
demux_pts -= hr_seek_offset;
demux_flags = (demux_flags | SEEK_HR | SEEK_BACKWARD) & ~SEEK_FORWARD;
}
bool hr_seek = opts->correct_pts && seek.exact != MPSEEK_KEYFRAME;
hr_seek &= (opts->hr_seek == 0 && seek.type == MPSEEK_ABSOLUTE) ||
opts->hr_seek > 0 || seek.exact >= MPSEEK_EXACT;
if (seek.type == MPSEEK_FACTOR || seek.amount < 0 ||
(seek.type == MPSEEK_ABSOLUTE && seek.amount < mpctx->last_chapter_pts))
mpctx->last_chapter_seek = -2;
// Prefer doing absolute seeks, unless not possible.
if ((seek.type == MPSEEK_FACTOR && !mpctx->demuxer->ts_resets_possible &&
target_time != MP_NOPTS_VALUE) || seek.type == MPSEEK_RELATIVE)
{
seek.type = MPSEEK_ABSOLUTE;
seek.amount = target_time;
}
hr_seek &= seek.type == MPSEEK_ABSOLUTE; // otherwise, no target PTS known
double demuxer_amount = seek.amount;
int demuxer_style = seek.type == MPSEEK_FACTOR ? SEEK_FACTOR : 0;
if (hr_seek || direction < 0) {
demuxer_style |= SEEK_BACKWARD;
} else if (direction > 0) {
demuxer_style |= SEEK_FORWARD;
}
if (hr_seek)
demuxer_style |= SEEK_HR;
if (hr_seek)
demuxer_amount -= hr_seek_offset;
demux_seek(mpctx->demuxer, demuxer_amount, demuxer_style);
demux_seek(mpctx->demuxer, demux_pts, demux_flags);
// Seek external, extra files too:
for (int t = 0; t < mpctx->num_tracks; t++) {
struct track *track = mpctx->tracks[t];
if (track->selected && track->is_external && track->demuxer) {
double main_new_pos = demuxer_amount;
if (seek.type != MPSEEK_ABSOLUTE)
main_new_pos = target_time;
double main_new_pos = demux_pts;
if (demux_flags & SEEK_FACTOR)
main_new_pos = seek_pts;
demux_seek(track->demuxer, main_new_pos, 0);
}
}
clear_audio_output_buffers(mpctx);
reset_playback_state(mpctx);
/* Use the target time as "current position" for further relative
* seeks etc until a new video frame has been decoded */
mpctx->last_seek_pts = target_time;
mpctx->last_seek_pts = seek_pts;
if (hr_seek) {
mpctx->hrseek_active = true;
mpctx->hrseek_framedrop = !hr_seek_very_exact && opts->hr_seek_framedrop;
mpctx->hrseek_backstep = backstep;
mpctx->hrseek_pts = seek.amount;
mpctx->hrseek_backstep = seek.type == MPSEEK_BACKSTEP;
mpctx->hrseek_pts = seek_pts;
MP_VERBOSE(mpctx, "hr-seek, skipping to %f%s%s\n", mpctx->hrseek_pts,
mpctx->hrseek_framedrop ? "" : " (no framedrop)",
mpctx->hrseek_backstep ? " (backstep)" : "");
}
if (mpctx->stop_play == AT_END_OF_FILE)
mpctx->stop_play = KEEP_PLAYING;
mpctx->start_timestamp = mp_time_sec();
mpctx->sleeptime = 0;