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avformat/dvdvideodec: implement seeking

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Player applications can now enjoy seeking while playing back
a title. Accuracy is at the mercy of what libdvdnav exposes,
which is currently dvdnav_time_search().

Signed-off-by: Marth64 <marth64@proxyid.net>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Marth64 2024-09-13 00:37:44 -05:00 committed by Anton Khirnov
parent e66f977494
commit 8707c8660d
1 changed files with 72 additions and 5 deletions
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77
libavformat/dvdvideodec.c
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@ -110,6 +110,7 @@ typedef struct DVDVideoPlaybackState {
int in_pgc; /* if our navigator is in the PGC */
int in_ps; /* if our navigator is in the program stream */
int in_vts; /* if our navigator is in the VTS */
int is_seeking; /* relax navigation path while seeking */
int64_t nav_pts; /* PTS according to IFO, not frame-accurate */
uint64_t pgc_duration_est; /* estimated duration as reported by IFO */
uint64_t pgc_elapsed; /* the elapsed time of the PGC, cell-relative */
@ -167,6 +168,7 @@ typedef struct DVDVideoDemuxContext {
int play_end; /* signal EOF to the parent demuxer */
DVDVideoPlaybackState play_state; /* the active playback state */
int play_started; /* signal that playback has started */
int seek_warned; /* signal that we warned about seeking limits */
int segment_started; /* signal that subdemuxer is on a segment */
} DVDVideoDemuxContext;
@ -715,7 +717,8 @@ static int dvdvideo_play_next_ps_block(AVFormatContext *s, DVDVideoPlaybackState
state->in_pgc = 1;
}
} else if (state->celln >= e_cell->cellN || state->pgn > cur_pgn) {
} else if (!state->is_seeking &&
(state->celln >= e_cell->cellN || state->pgn > cur_pgn)) {
return AVERROR_EOF;
}
@ -728,7 +731,7 @@ static int dvdvideo_play_next_ps_block(AVFormatContext *s, DVDVideoPlaybackState
if (!state->in_pgc)
continue;
if ((state->ptt > 0 && state->ptt > cur_ptt) ||
if ((!state->is_seeking && state->ptt > 0 && state->ptt > cur_ptt) ||
(c->opt_chapter_end > 0 && cur_ptt > c->opt_chapter_end)) {
return AVERROR_EOF;
}
@ -811,6 +814,8 @@ static int dvdvideo_play_next_ps_block(AVFormatContext *s, DVDVideoPlaybackState
(*p_nav_event) = nav_event;
state->is_seeking = 0;
return nav_len;
case DVDNAV_WAIT:
if (dvdnav_wait_skip(state->dvdnav) != DVDNAV_STATUS_OK) {
@ -1688,6 +1693,67 @@ static int dvdvideo_close(AVFormatContext *s)
return 0;
}
static int dvdvideo_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
DVDVideoDemuxContext *c = s->priv_data;
int64_t new_nav_pts;
pci_t* new_nav_pci;
dsi_t* new_nav_dsi;
if (c->opt_menu || c->opt_chapter_start > 1) {
av_log(s, AV_LOG_ERROR, "Seeking is not compatible with menus or chapter extraction\n");
return AVERROR_PATCHWELCOME;
}
if ((flags & AVSEEK_FLAG_BYTE))
return AVERROR(ENOSYS);
if (timestamp < 0)
return AVERROR(EINVAL);
if (!c->seek_warned) {
av_log(s, AV_LOG_WARNING, "Seeking is inherently unreliable and will result "
"in imprecise timecodes from this point\n");
c->seek_warned = 1;
}
/* XXX(PATCHWELCOME): use dvdnav_jump_to_sector_by_time(c->play_state.dvdnav, timestamp, 0)
* when it is available in a released version of libdvdnav; it is more accurate */
if (dvdnav_time_search(c->play_state.dvdnav, timestamp) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "libdvdnav: seeking to %" PRId64 " failed\n", timestamp);
return AVERROR_EXTERNAL;
}
new_nav_pts = dvdnav_get_current_time (c->play_state.dvdnav);
new_nav_pci = dvdnav_get_current_nav_pci(c->play_state.dvdnav);
new_nav_dsi = dvdnav_get_current_nav_dsi(c->play_state.dvdnav);
if (new_nav_pci == NULL || new_nav_dsi == NULL) {
av_log(s, AV_LOG_ERROR, "Invalid NAV packet after seeking\n");
return AVERROR_INVALIDDATA;
}
c->play_state.in_pgc = 1;
c->play_state.in_ps = 0;
c->play_state.is_seeking = 1;
c->play_state.nav_pts = timestamp;
c->play_state.ts_offset = timestamp;
c->play_state.vobu_e_ptm = new_nav_pci->pci_gi.vobu_s_ptm;
c->first_pts = 0;
c->play_started = 0;
dvdvideo_subdemux_flush(s);
av_log(s, AV_LOG_DEBUG, "seeking: requested_nav_pts=%" PRId64 " new_nav_pts=%" PRId64 "\n",
timestamp, new_nav_pts);
return 0;
}
#define OFFSET(x) offsetof(DVDVideoDemuxContext, x)
static const AVOption dvdvideo_options[] = {
{"angle", "playback angle number", OFFSET(opt_angle), AV_OPT_TYPE_INT, { .i64=1 }, 1, 9, AV_OPT_FLAG_DECODING_PARAM },
@ -1716,11 +1782,12 @@ const FFInputFormat ff_dvdvideo_demuxer = {
.p.name = "dvdvideo",
.p.long_name = NULL_IF_CONFIG_SMALL("DVD-Video"),
.p.priv_class = &dvdvideo_class,
.p.flags = AVFMT_NOFILE | AVFMT_SHOW_IDS | AVFMT_TS_DISCONT |
AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH,
.p.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT | AVFMT_SEEK_TO_PTS |
AVFMT_NOFILE | AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH,
.priv_data_size = sizeof(DVDVideoDemuxContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_close = dvdvideo_close,
.read_header = dvdvideo_read_header,
.read_packet = dvdvideo_read_packet
.read_packet = dvdvideo_read_packet,
.read_seek = dvdvideo_read_seek
};