[FFmpeg-devel] [PATCH] cllc: Implement YUYV support
Michael Niedermayer
michaelni at gmx.at
Mon Jun 24 04:09:51 CEST 2013
On Sun, Jun 23, 2013 at 07:40:53PM -0400, Derek Buitenhuis wrote:
> Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>
> ---
> libavcodec/cllc.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 100 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c
> index 6378c79..13e35d9 100644
> --- a/libavcodec/cllc.c
> +++ b/libavcodec/cllc.c
> @@ -1,7 +1,7 @@
> /*
> * Canopus Lossless Codec decoder
> *
> - * Copyright (c) 2012 Derek Buitenhuis
> + * Copyright (c) 2012-2013 Derek Buitenhuis
> *
> * This file is part of FFmpeg.
> *
> @@ -179,6 +179,40 @@ static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb,
> return 0;
> }
>
> +static int read_yuv_component_line(CLLCContext *ctx, GetBitContext *gb,
> + int *top_left, VLC *vlc, uint8_t *outbuf,
> + int luma)
> +{
> + uint8_t *dst;
> + int pred, code;
> + int i;
> + int step;
> +
> + OPEN_READER(bits, gb);
> +
> + dst = outbuf;
> + pred = *top_left;
> +
> + step = luma ? 4 : 2;
> +
> + /* Simultaneously read and restore the line */
> + for (i = 0; i < ctx->avctx->width / (step / 2); i++) {
> + UPDATE_CACHE(bits, gb);
> + GET_VLC(code, bits, gb, vlc->table, 7, 2);
> +
> + pred += code;
> + dst[0] = pred;
> + dst += step;
> + }
> +
> + CLOSE_READER(bits, gb);
> +
> + /* Stash the first pixel */
> + *top_left = dst[-2 * ctx->avctx->width];
> +
> + return 0;
> +}
does this codec need any width % 2 != 0 or width > 1 check ?
LGTM otherwise
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
He who knows, does not speak. He who speaks, does not know. -- Lao Tsu
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