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Don't start decoding video before keyframe

This commit is contained in:
Bernat Arlandis 2025-02-11 11:24:05 +01:00
parent 8e7b47840f
commit 69baa6de16
1 changed files with 22 additions and 12 deletions
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34
modules/theora/video_stream_theora.cpp
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@ -214,14 +214,14 @@ int64_t VideoStreamPlaybackTheora::seek_streams(double p_time, int64_t &cur_vide
audio_catch = cur_audio_granulepos != -1;
}
if (cur_video_granulepos == -1) {
if (cur_video_granulepos < (1LL << ti.keyframe_granule_shift)) {
video_seek_pos = stream_data_offset;
cur_video_granulepos = 1LL << ti.keyframe_granule_shift;
}
if (has_audio) {
if (cur_audio_granulepos == -1) {
audio_seek_pos = stream_data_offset;
cur_audio_granulepos = 1LL << ti.keyframe_granule_shift;
cur_audio_granulepos = 0;
}
seek_pos = MIN(video_seek_pos, audio_seek_pos);
} else {
@ -682,15 +682,13 @@ void VideoStreamPlaybackTheora::seek(double p_time) {
time = p_time;
// We need to reset video granulepos in case decoding has to start from the beginning.
int64_t granulepos = 0;
th_decode_ctl(td, TH_DECCTL_SET_GRANPOS, &granulepos, sizeof(granulepos));
double last_audio_time = 0;
double last_video_time = 0;
bool first_frame_decoded = false;
bool start_audio = false;
bool start_video = false;
bool keyframe_found = false;
uint64_t current_frame = 0;
// Read from the streams skipping pages until we reach the granules we want. We won't skip pages from both video and
// audio streams, only one of them, until decoding of both starts.
// video_granulepos and audio_granulepos are guaranteed to be found by checking the granulepos in the packets, no
@ -722,15 +720,27 @@ void VideoStreamPlaybackTheora::seek(double p_time) {
}
while (last_video_time <= p_time && ogg_stream_packetout(&to, &op) > 0) {
if (!start_video && (op.granulepos >= video_granulepos || video_granulepos == (1LL << ti.keyframe_granule_shift))) {
if (op.granulepos > 0) {
current_frame = th_granule_frame(td, op.granulepos);
}
start_video = true;
th_decode_ctl(td, TH_DECCTL_SET_GRANPOS, &op.granulepos, sizeof(op.granulepos));
}
// Don't start decoding until a keyframe is found, but count frames.
if (start_video) {
int64_t videobuf_granulepos;
int ret = th_decode_packetin(td, &op, &videobuf_granulepos);
if (ret == 0 || ret == TH_DUPFRAME) {
last_video_time = th_granule_time(td, videobuf_granulepos);
first_frame_decoded = true;
if (!keyframe_found && th_packet_iskeyframe(&op)) {
keyframe_found = true;
int64_t cur_granulepos = (current_frame + 1) << ti.keyframe_granule_shift;
th_decode_ctl(td, TH_DECCTL_SET_GRANPOS, &cur_granulepos, sizeof(cur_granulepos));
}
if (keyframe_found) {
int64_t videobuf_granulepos;
int ret = th_decode_packetin(td, &op, &videobuf_granulepos);
if (ret == 0 || ret == TH_DUPFRAME) {
last_video_time = th_granule_time(td, videobuf_granulepos);
first_frame_decoded = true;
}
} else {
current_frame++;
}
}
}