Andreas Rheinhardt:
> 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,
> };
>
Will apply this patchset tomorrow unless there are objections.
- Andreas
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