Function ipvideo_decode_block_opcode_0x9

libavcodec/interplayvideo.c:330–398

}

static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s, AVFrame *frame)
{
    int x, y;
    unsigned char P[4];

    if (bytestream2_get_bytes_left(&s->stream_ptr) < 8) {
        av_log(s->avctx, AV_LOG_ERROR, "too little data for opcode 0x9\n");
        return AVERROR_INVALIDDATA;
    }

    /* 4-color encoding */
    bytestream2_get_buffer(&s->stream_ptr, P, 4);

    if (P[0] <= P[1]) {
        if (P[2] <= P[3]) {

            /* 1 of 4 colors for each pixel, need 16 more bytes */
            for (y = 0; y < 8; y++) {
                /* get the next set of 8 2-bit flags */
                int flags = bytestream2_get_le16(&s->stream_ptr);
                for (x = 0; x < 8; x++, flags >>= 2)
                    *s->pixel_ptr++ = P[flags & 0x03];
                s->pixel_ptr += s->line_inc;
            }

        } else {
            uint32_t flags;

            /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
            flags = bytestream2_get_le32(&s->stream_ptr);

            for (y = 0; y < 8; y += 2) {
                for (x = 0; x < 8; x += 2, flags >>= 2) {
                    s->pixel_ptr[x                ] =
                    s->pixel_ptr[x + 1            ] =
                    s->pixel_ptr[x +     s->stride] =
                    s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
                }
                s->pixel_ptr += s->stride * 2;
            }

        }
    } else {
        uint64_t flags;

        /* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */
        flags = bytestream2_get_le64(&s->stream_ptr);
        if (P[2] <= P[3]) {
            for (y = 0; y < 8; y++) {
                for (x = 0; x < 8; x += 2, flags >>= 2) {
                    s->pixel_ptr[x    ] =
                    s->pixel_ptr[x + 1] = P[flags & 0x03];
                }
                s->pixel_ptr += s->stride;
            }
        } else {
            for (y = 0; y < 8; y += 2) {
                for (x = 0; x < 8; x++, flags >>= 2) {