From: Timotej Lazar <timotej.la...@araneo.si>
Add .read_seek function to the smacker demuxer for the special case of
seeking to ts=0. This is useful because smacker – like bink, with a
similar implementation – was mostly used to encode clips in video
games, where random seeks are rare but looping media are common.
Signed-off-by: Timotej Lazar <timotej.la...@araneo.si>
---
libavformat/smacker.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/libavformat/smacker.c b/libavformat/smacker.c
index 0ca5a87b8f..5507e7c169 100644
--- a/libavformat/smacker.c
+++ b/libavformat/smacker.c
@@ -349,6 +349,31 @@ next_frame:
return ret;
}
+static int smacker_read_seek(AVFormatContext *s, int stream_index,
+ int64_t timestamp, int flags)
+{
+ SmackerContext *smk = s->priv_data;
+ int64_t ret;
+
+ /* only rewinding to start is supported */
+ if (timestamp != 0) {
+ av_log(s, AV_LOG_ERROR,
+ "Random seeks are not supported (can only seek to start).\n");
+ return AVERROR(EINVAL);
+ }
+
+ if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0)
+ return ret;
+
+ smk->cur_frame = 0;
+ smk->next_audio_index = 0;
+ smk->new_palette = 0;
+ memset(smk->pal, 0, sizeof(smk->pal));
+ memset(smk->aud_pts, 0, sizeof(smk->aud_pts));
+
+ return 0;
+}
+
AVInputFormat ff_smacker_demuxer = {
.name = "smk",
.long_name = NULL_IF_CONFIG_SMALL("Smacker"),
@@ -356,4 +381,5 @@ AVInputFormat ff_smacker_demuxer = {
.read_probe = smacker_probe,
.read_header = smacker_read_header,
.read_packet = smacker_read_packet,
+ .read_seek = smacker_read_seek,
};
--
2.20.1
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
