On 9/24/2020 8:59 AM, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> libavcodec/Makefile | 1 +
> libavcodec/allcodecs.c | 1 +
> libavcodec/argo.c | 739 ++++++++++++++++++++++++++++++++++++++++
> libavcodec/codec_desc.c | 7 +
> libavcodec/codec_id.h | 1 +
> libavformat/argo_brp.c | 14 +-
> 6 files changed, 751 insertions(+), 12 deletions(-)
> create mode 100644 libavcodec/argo.c
[...]
> +static int decode_alcd(AVCodecContext *avctx, AVFrame *frame)
> +{
> + ArgoContext *s = avctx->priv_data;
> + GetByteContext *gb = &s->gb;
> + GetByteContext sb;
> + const int l = frame->linesize[0];
> + const uint8_t *map = gb->buffer;
> + uint8_t *dst = frame->data[0];
> + uint8_t codes = 0;
> + int count = 0;
> +
> + if (bytestream2_get_bytes_left(gb) < 1024 + (((frame->width / 2) *
> (frame->height / 2) + 7) >> 3))
> + return AVERROR_INVALIDDATA;
> +
> + bytestream2_skipu(gb, 1024);
> + sb = *gb;
> + bytestream2_skipu(gb, ((frame->width / 2) * (frame->height / 2) + 7) >>
> 3);
> +
> + for (int y = 0; y < frame->height; y += 2) {
> + for (int x = 0; x < frame->width; x += 2) {
> + const uint8_t *block;
> + int index;
> +
> + if (count == 0) {
> + codes = bytestream2_get_byteu(&sb);
> + count = 8;
> + }
> +
> + if (codes & 0x80) {
> + index = bytestream2_get_byte(gb);
> + block = map + index * 4;
> +
> + dst[x+0] = block[0];
> + dst[x+1] = block[1];
> + dst[x+l] = block[2];
> + dst[x+l+1] = block[3];
> + }
This doesn't look right.
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