Quoting Tomas Härdin (2022-05-31 11:58:39)
>
>
> From fedd7f9ae2c691a25c37be935d7547be61d46017 Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?Tomas=20H=C3=A4rdin?= <g...@haerdin.se>
> Date: Fri, 20 May 2022 11:38:25 +0200
> Subject: [PATCH 1/8] libavcodec/jpeg2000_parser: Speed up long skips
>
> ---
> libavcodec/jpeg2000_parser.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/libavcodec/jpeg2000_parser.c b/libavcodec/jpeg2000_parser.c
> index 2975e71482..9fac958dfa 100644
> --- a/libavcodec/jpeg2000_parser.c
> +++ b/libavcodec/jpeg2000_parser.c
> @@ -95,6 +95,17 @@ static int find_frame_end(JPEG2000ParserContext *m, const
> uint8_t *buf, int buf_
> state64 = state64 << 8 | buf[i];
> m->bytes_read++;
> if (m->skip_bytes) {
> + // handle long skips
> + if (m->skip_bytes > 8) {
> + // need -9 else buf_size - i == 8 ==> i == buf_size after
> this,
> + // and thus i == buf_size + 1 after the loop
> + int64_t skip = FFMIN(m->skip_bytes - 8, buf_size - i - 9);
> + if (skip > 0) {
> + m->skip_bytes -= skip;
> + i += skip;
> + m->bytes_read += skip;
Shouldn't you also update state(64)?
--
Anton Khirnov
_______________________________________________
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".
