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demux: move a seek helper to a separate function

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It makes some slight sense and helps with one of the following commits.

Also rename that other function to make it sound less similar to
find_seek_target().
This commit is contained in:
wm4 2019-07-07 17:40:33 +02:00
parent 7893ab5a7e
commit b55b9cb98c
1 changed files with 47 additions and 35 deletions
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82
demux/demux.c
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@ -3461,9 +3461,10 @@ static struct demux_packet *find_seek_target(struct demux_queue *queue,
return target;
}
// Return a cache range for the given pts/flags, or NULL if none available.
// must be called locked
static struct demux_cached_range *find_cache_seek_target(struct demux_internal *in,
double pts, int flags)
static struct demux_cached_range *find_cache_seek_range(struct demux_internal *in,
double pts, int flags)
{
// Note about queued low level seeks: in->seeking can be true here, and it
// might come from a previous resume seek to the current range. If we end
@ -3472,6 +3473,8 @@ static struct demux_cached_range *find_cache_seek_target(struct demux_internal *
if ((flags & SEEK_FACTOR) || !in->seekable_cache)
return NULL;
struct demux_cached_range *res = NULL;
for (int n = 0; n < in->num_ranges; n++) {
struct demux_cached_range *r = in->ranges[n];
if (r->seek_start != MP_NOPTS_VALUE) {
@ -3482,50 +3485,59 @@ static struct demux_cached_range *find_cache_seek_target(struct demux_internal *
(pts <= r->seek_end || r->is_eof))
{
MP_VERBOSE(in, "...using this range for in-cache seek.\n");
return r;
res = r;
break;
}
}
}
return NULL;
return res;
}
// Adjust the seek target to the found video key frames. Otherwise the
// video will undershoot the seek target, while audio will be closer to it.
// The player frontend will play the additional video without audio, so
// you get silent audio for the amount of "undershoot". Adjusting the seek
// target will make the audio seek to the video target or before.
// (If hr-seeks are used, it's better to skip this, as it would only mean
// that more audio data than necessary would have to be decoded.)
static void adjust_cache_seek_target(struct demux_internal *in,
struct demux_cached_range *range,
double *pts, int *flags)
{
if (*flags & SEEK_HR)
return;
for (int n = 0; n < in->num_streams; n++) {
struct demux_stream *ds = in->streams[n]->ds;
struct demux_queue *queue = range->streams[n];
if (ds->selected && ds->type == STREAM_VIDEO) {
struct demux_packet *target = find_seek_target(queue, *pts, *flags);
if (target) {
double target_pts;
compute_keyframe_times(target, &target_pts, NULL);
if (target_pts != MP_NOPTS_VALUE) {
MP_VERBOSE(in, "adjust seek target %f -> %f\n",
*pts, target_pts);
// (We assume the find_seek_target() call will return
// the same target for the video stream.)
*pts = target_pts;
*flags &= ~SEEK_FORWARD;
}
}
break;
}
}
}
// must be called locked
// range must be non-NULL and from find_cache_seek_target() using the same pts
// range must be non-NULL and from find_cache_seek_range() using the same pts
// and flags, before any other changes to the cached state
static void execute_cache_seek(struct demux_internal *in,
struct demux_cached_range *range,
double pts, int flags)
{
// Adjust the seek target to the found video key frames. Otherwise the
// video will undershoot the seek target, while audio will be closer to it.
// The player frontend will play the additional video without audio, so
// you get silent audio for the amount of "undershoot". Adjusting the seek
// target will make the audio seek to the video target or before.
// (If hr-seeks are used, it's better to skip this, as it would only mean
// that more audio data than necessary would have to be decoded.)
if (!(flags & SEEK_HR)) {
for (int n = 0; n < in->num_streams; n++) {
struct demux_stream *ds = in->streams[n]->ds;
struct demux_queue *queue = range->streams[n];
if (ds->selected && ds->type == STREAM_VIDEO) {
struct demux_packet *target = find_seek_target(queue, pts, flags);
if (target) {
double target_pts;
compute_keyframe_times(target, &target_pts, NULL);
if (target_pts != MP_NOPTS_VALUE) {
MP_VERBOSE(in, "adjust seek target %f -> %f\n",
pts, target_pts);
// (We assume the find_seek_target() call will return
// the same target for the video stream.)
pts = target_pts;
flags &= ~SEEK_FORWARD;
}
}
break;
}
}
}
adjust_cache_seek_target(in, range, &pts, &flags);
for (int n = 0; n < in->num_streams; n++) {
struct demux_stream *ds = in->streams[n]->ds;
@ -3624,7 +3636,7 @@ static bool queue_seek(struct demux_internal *in, double seek_pts, int flags,
flags &= ~(unsigned)SEEK_SATAN;
struct demux_cached_range *cache_target =
find_cache_seek_target(in, seek_pts, flags);
find_cache_seek_range(in, seek_pts, flags);
if (!cache_target) {
if (require_cache) {