Re: [FFmpeg-devel] [PATCH 1/4] avcodec/mdec: DC reading for STRv1 is like STRv2

[Michael Niedermayer <michael@niedermayer.cc>]

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On Tue, Jan 02, 2024 at 02:49:26AM +0000, aybe aybe wrote:
> Hi,
> 
> As I understand, support for .STR files is broken for almost 10 years now (since 161442ff2c4b0dd8a5072c6bbe6bf55303fffccf it seems).
> 
> Currently, ffmpeg fails with tons of errors like this on version 1 STRs, e.g. Wipeout 1:
> [mdec @ 00000000027c72c0] ac-tex damaged at 1 9
> 
> What happens is that only the audio is present in the video file.
> 
> Anyway, that one character patch fixes the problem, video is now rendered.
> 
> Signed-off-by: aybe <aybe@users.noreply.github.com>
> ---
>   libavcodec/mdec.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c
> index 44b12471a9..c4904216b8 100644
> --- a/libavcodec/mdec.c
> +++ b/libavcodec/mdec.c
> @@ -68,7 +68,7 @@ static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
>       const int qscale = a->qscale;
> 
>       /* DC coefficient */
> -    if (a->version == 2) {
> +    if (a->version <= 2) {
>           block[0] = 2 * get_sbits(&a->gb, 10) + 1024;
>       } else {
>           component = (n <= 3 ? 0 : n - 4 + 1);

This seems not to apply automatically here

Applying: avcodec/mdec: DC reading for STRv1 is like STRv2
Using index info to reconstruct a base tree...
error: patch failed: libavcodec/mdec.c:68
error: libavcodec/mdec.c: patch does not apply
error: Did you hand edit your patch?

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Asymptotically faster algorithms should always be preferred if you have
asymptotical amounts of data

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