[FFmpeg-devel] [PATCH] avcodec: add PhotoCD decoder

[Paul B Mahol]

On 8/29/20, Paul B Mahol <onemda at gmail.com> wrote:
> Signed-Goff-by: Paul B Mahol <onemda at gmail.com>
> ---
> Probably need to be applied on top of moflex v2 patch set.
> ---

[...]

> +
> +static av_cold int photocd_decode_init(AVCodecContext *avctx)
> +{
> +    avctx->pix_fmt         = AV_PIX_FMT_YUV420P;
> +    avctx->colorspace      = AVCOL_SPC_BT709;
> +    avctx->color_primaries = AVCOL_PRI_BT709;
> +    avctx->color_trc       = AVCOL_TRC_IEC61966_2_4;
> +    avctx->color_range     = AVCOL_RANGE_MPEG;

Locally changed to JPEG color range, as that is much better looking.

> +
> +    return 0;
> +}
> +
> +static av_cold int photocd_decode_close(AVCodecContext *avctx)
> +{
> +    PhotoCDContext *s = avctx->priv_data;
> +
> +    for (int i = 0; i < 3; i++)
> +        ff_free_vlc(&s->vlc[i]);
> +
> +    return 0;
> +}
> +
> +#define OFFSET(x) offsetof(PhotoCDContext, x)
> +#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
> +
> +static const AVOption options[] = {
> +    { "lowres",  "Lower the decoding resolution by a power of two",
> +        OFFSET(lowres), AV_OPT_TYPE_INT,  { .i64 = 0 }, 0, 4, VD },
> +    { NULL },
> +};
> +
> +static const AVClass photocd_class = {
> +    .class_name = "photocd",
> +    .item_name  = av_default_item_name,
> +    .option     = options,
> +    .version    = LIBAVUTIL_VERSION_INT,
> +};
> +
> +AVCodec ff_photocd_decoder = {
> +    .name           = "photocd",
> +    .type           = AVMEDIA_TYPE_VIDEO,
> +    .id             = AV_CODEC_ID_PHOTOCD,
> +    .priv_data_size = sizeof (PhotoCDContext),
> +    .priv_class     = &photocd_class,
> +    .init           = photocd_decode_init,
> +    .close          = photocd_decode_close,
> +    .decode         = photocd_decode_frame,
> +    .capabilities   = AV_CODEC_CAP_DR1,
> +    .long_name      = NULL_IF_CONFIG_SMALL("Kodak Photo CD"),
> +};
> diff --git a/libavformat/img2.c b/libavformat/img2.c
> index d243d6c125..db37aa7228 100644
> --- a/libavformat/img2.c
> +++ b/libavformat/img2.c
> @@ -55,6 +55,7 @@ const IdStrMap ff_img_tags[] = {
>      { AV_CODEC_ID_TIFF,       "dng"      },
>      { AV_CODEC_ID_SGI,        "sgi"      },
>      { AV_CODEC_ID_PTX,        "ptx"      },
> +    { AV_CODEC_ID_PHOTOCD,    "pcd"      },
>      { AV_CODEC_ID_PCX,        "pcx"      },
>      { AV_CODEC_ID_QDRAW,      "pic"      },
>      { AV_CODEC_ID_QDRAW,      "pct"      },
> --
> 2.17.1
>
>