static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
                                const uint8_t *buf, int buf_size)
{
    ParseContext *pc = &dctx->pc;
    uint64_t state = pc->state64;
    int pic_found = pc->frame_start_found;
    int i = 0;
    int interlaced = dctx->interlaced;
    int cur_field = dctx->cur_field;

    if (!pic_found) {
        for (i = 0; i < buf_size; i++) {
            state = (state << 8) | buf[i];
            if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) {
                i++;
                pic_found = 1;
                interlaced = (state&2)>>1; /* byte following the 5-byte header prefix */
                cur_field = state&1;
                dctx->cur_byte = 0;
                dctx->remaining = 0;
                break;
            }
        }
    }

    if (pic_found && !dctx->remaining) {
        if (!buf_size) /* EOF considered as end of frame */
            return 0;
        for (; i < buf_size; i++) {
            dctx->cur_byte++;
            state = (state << 8) | buf[i];

            if (dctx->cur_byte == 24) {
                dctx->h = (state >> 32) & 0xFFFF;
            } else if (dctx->cur_byte == 26) {
                dctx->w = (state >> 32) & 0xFFFF;
            } else if (dctx->cur_byte == 42) {
                int cid = (state >> 32) & 0xFFFFFFFF;
                int remaining;

                if (cid <= 0)
                    continue;

                remaining = avpriv_dnxhd_get_frame_size(cid);
                if (remaining <= 0) {
                    remaining = dnxhd_get_hr_frame_size(cid, dctx->w, dctx->h);
                    if (remaining <= 0)
                        continue;
                }
                dctx->remaining = remaining;
                if (buf_size - i >= dctx->remaining && (!dctx->interlaced || dctx->cur_field)) {
                    int remaining = dctx->remaining;

                    pc->frame_start_found = 0;
                    pc->state64 = -1;
                    dctx->interlaced = interlaced;
                    dctx->cur_field = 0;
                    dctx->cur_byte = 0;
                    dctx->remaining = 0;
                    return remaining;
                } else {
                    dctx->remaining -= buf_size;
                }
            }
        }
    } else if (pic_found) {
        if (dctx->remaining > buf_size) {
            dctx->remaining -= buf_size;
        } else {
            int remaining = dctx->remaining;

            pc->frame_start_found = 0;
            pc->state64 = -1;
            dctx->interlaced = interlaced;
            dctx->cur_field = 0;
            dctx->cur_byte = 0;
            dctx->remaining = 0;
            return remaining;
        }
    }
    pc->frame_start_found = pic_found;
    pc->state64 = state;
    dctx->interlaced = interlaced;
    dctx->cur_field = cur_field;
    return END_NOT_FOUND;
}
static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
                                const uint8_t *buf, int buf_size)
{
    ParseContext *pc = &dctx->pc;
    uint64_t state = pc->state64;
    int pic_found = pc->frame_start_found;
    int i = 0;
    int interlaced = dctx->interlaced;
    int cur_field = dctx->cur_field;

    if (!pic_found) {
        for (i = 0; i < buf_size; i++) {
            state = (state << 8) | buf[i];
            if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) {
                i++;
                pic_found = 1;
                interlaced = (state&2)>>1;  
                cur_field = state&1;
                dctx->cur_byte = 0;
                dctx->remaining = 0;
                break;
            }
        }
    }

    if (pic_found && !dctx->remaining) {
        if (!buf_size)  
            return 0;
        for (; i < buf_size; i++) {
            dctx->cur_byte++;
            state = (state << 8) | buf[i];

            if (dctx->cur_byte == 24) {
                dctx->h = (state >> 32) & 0xFFFF;
            } else if (dctx->cur_byte == 26) {
                dctx->w = (state >> 32) & 0xFFFF;
            } else if (dctx->cur_byte == 42) {
                int cid = (state >> 32) & 0xFFFFFFFF;
                int remaining;

                if (cid <= 0)
                    continue;

                remaining = avpriv_dnxhd_get_frame_size(cid);
                if (remaining <= 0) {
                    remaining = dnxhd_get_hr_frame_size(cid, dctx->w, dctx->h);
                    if (remaining <= 0)
                        continue;
                }
                dctx->remaining = remaining;
                if (buf_size - i >= dctx->remaining && (!dctx->interlaced || dctx->cur_field)) {
                    int remaining = dctx->remaining;

                    pc->frame_start_found = 0;
                    pc->state64 = -1;
                    dctx->interlaced = interlaced;
                    dctx->cur_field = 0;
                    dctx->cur_byte = 0;
                    dctx->remaining = 0;
                    return remaining;
                } else {
                    dctx->remaining -= buf_size;
                }
            }
        }
    } else if (pic_found) {
        if (dctx->remaining > buf_size) {
            dctx->remaining -= buf_size;
        } else {
            int remaining = dctx->remaining;

            pc->frame_start_found = 0;
            pc->state64 = -1;
            dctx->interlaced = interlaced;
            dctx->cur_field = 0;
            dctx->cur_byte = 0;
            dctx->remaining = 0;
            return remaining;
        }
    }
    pc->frame_start_found = pic_found;
    pc->state64 = state;
    dctx->interlaced = interlaced;
    dctx->cur_field = cur_field;
    return END_NOT_FOUND;
}