static void decode_interframe_v4a(AVCodecContext *avctx, uint8_t *src,
                                  uint32_t size)
{
    Hnm4VideoContext *hnm = avctx->priv_data;
    GetByteContext gb;
    uint32_t writeoffset = 0, offset;
    uint8_t tag, count, previous, delta;

    bytestream2_init(&gb, src, size);

    while (bytestream2_tell(&gb) < size) {
        count = bytestream2_peek_byte(&gb) & 0x3F;
        if (count == 0) {
            tag = bytestream2_get_byte(&gb) & 0xC0;
            tag = tag >> 6;
            if (tag == 0) {
                writeoffset += bytestream2_get_byte(&gb);
            } else if (tag == 1) {
                if (writeoffset + hnm->width >= hnm->width * hnm->height) {
                    av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
                    break;
                }
                hnm->current[writeoffset]              = bytestream2_get_byte(&gb);
                hnm->current[writeoffset + hnm->width] = bytestream2_get_byte(&gb);
                writeoffset++;
            } else if (tag == 2) {
                writeoffset += hnm->width;
            } else if (tag == 3) {
                break;
            }
            if (writeoffset > hnm->width * hnm->height) {
                av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
                break;
            }
        } else {
            delta    = bytestream2_peek_byte(&gb) & 0x80;
            previous = bytestream2_peek_byte(&gb) & 0x40;
            bytestream2_skip(&gb, 1);

            offset  = writeoffset;
            offset += bytestream2_get_le16(&gb);

            if (delta)
                offset -= 0x10000;

            if (offset + hnm->width + count >= hnm->width * hnm->height) {
                av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
                break;
            } else if (writeoffset + hnm->width + count >= hnm->width * hnm->height) {
                av_log(avctx, AV_LOG_ERROR, "Attempting to write out of bounds\n");
                break;
            }

            if (previous) {
                while (count > 0) {
                    hnm->current[writeoffset]              = hnm->previous[offset];
                    hnm->current[writeoffset + hnm->width] = hnm->previous[offset + hnm->width];
                    writeoffset++;
                    offset++;
                    count--;
                }
            } else {
                while (count > 0) {
                    hnm->current[writeoffset]              = hnm->current[offset];
                    hnm->current[writeoffset + hnm->width] = hnm->current[offset + hnm->width];
                    writeoffset++;
                    offset++;
                    count--;
                }
            }
        }
    }
}