} else if (h->rects[region_id].nb_colors <= 16) {
} else if (h->rects[object_id].nb_colors <= 16) {
static int encode_dvb_subtitles(DVBSubtitleContext *s,                                 uint8_t *outbuf, AVSubtitle *h){    uint8_t *q, *pseg_len;    int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;    q = outbuf;    page_id = 1;    if (h->num_rects == 0 || h->rects == NULL)        return -1;    *q++ = 0x00; /* subtitle_stream_id */    /* page composition segment */    *q++ = 0x0f; /* sync_byte */    *q++ = 0x10; /* segment_type */    putbe16(&q, page_id);    pseg_len = q;    q += 2; /* segment length */    *q++ = 30; /* page_timeout (seconds) */    if (s->hide_state)        page_state = 0; /* normal case */    else        page_state = 2; /* mode change */    /* page_version = 0 + page_state */    *q++ = s->object_version | (page_state << 2) | 3;     for (region_id = 0; region_id < h->num_rects; region_id++) {        *q++ = region_id;        *q++ = 0xff; /* reserved */        putbe16(&q, h->rects[region_id].x); /* left pos */        putbe16(&q, h->rects[region_id].y); /* top pos */    }    putbe16(&pseg_len, q - pseg_len - 2);    if (!s->hide_state) {        for (clut_id = 0; clut_id < h->num_rects; clut_id++) {            /* CLUT segment */            if (h->rects[clut_id].nb_colors <= 4) {                /* 2 bpp, some decoders do not support it correctly */                bpp_index = 0;            } else if (h->rects[clut_id].nb_colors <= 16) {                /* 4 bpp, standard encoding */                bpp_index = 1;            } else {                return -1;            }            *q++ = 0x0f; /* sync byte */            *q++ = 0x12; /* CLUT definition segment */            putbe16(&q, page_id);            pseg_len = q;            q += 2; /* segment length */            *q++ = clut_id;            *q++ = (0 << 4) | 0xf; /* version = 0 */            for(i = 0; i < h->rects[clut_id].nb_colors; i++) {                *q++ = i; /* clut_entry_id */                *q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */                {                    int a, r, g, b;                    a = (h->rects[clut_id].rgba_palette[i] >> 24) & 0xff;                    r = (h->rects[clut_id].rgba_palette[i] >> 16) & 0xff;                    g = (h->rects[clut_id].rgba_palette[i] >> 8) & 0xff;                    b = (h->rects[clut_id].rgba_palette[i] >> 0) & 0xff;                    *q++ = RGB_TO_Y_CCIR(r, g, b);                    *q++ = RGB_TO_V_CCIR(r, g, b, 0);                    *q++ = RGB_TO_U_CCIR(r, g, b, 0);                    *q++ = 255 - a;                }            }            putbe16(&pseg_len, q - pseg_len - 2);        }    }    for (region_id = 0; region_id < h->num_rects; region_id++) {        /* region composition segment */                if (h->rects[region_id].nb_colors <= 4) {            /* 2 bpp, some decoders do not support it correctly */            bpp_index = 0;        } else if (h->rects[region_id].nb_colors <= 16) {            /* 4 bpp, standard encoding */            bpp_index = 1;        } else {            return -1;        }        *q++ = 0x0f; /* sync_byte */        *q++ = 0x11; /* segment_type */        putbe16(&q, page_id);        pseg_len = q;        q += 2; /* segment length */        *q++ = region_id;        *q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */        putbe16(&q, h->rects[region_id].w); /* region width */        putbe16(&q, h->rects[region_id].h); /* region height */        *q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;        *q++ = region_id; /* clut_id == region_id */        *q++ = 0; /* 8 bit fill colors */        *q++ = 0x03; /* 4 bit and 2 bit fill colors */        if (!s->hide_state) {            putbe16(&q, region_id); /* object_id == region_id */            *q++ = (0 << 6) | (0 << 4);            *q++ = 0;            *q++ = 0xf0;            *q++ = 0;        }        putbe16(&pseg_len, q - pseg_len - 2);    }    if (!s->hide_state) {                for (object_id = 0; object_id < h->num_rects; object_id++) {            /* Object Data segment */            if (h->rects[region_id].nb_colors <= 4) {                /* 2 bpp, some decoders do not support it correctly */                bpp_index = 0;            } else if (h->rects[region_id].nb_colors <= 16) {                /* 4 bpp, standard encoding */                bpp_index = 1;            } else {                return -1;            }            *q++ = 0x0f; /* sync byte */            *q++ = 0x13;            putbe16(&q, page_id);            pseg_len = q;            q += 2; /* segment length */            putbe16(&q, object_id);            *q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,                                                                       onject_coding_method,                                                                       non_modifying_color_flag */            {                uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;                void (*dvb_encode_rle)(uint8_t **pq,                                        const uint8_t *bitmap, int linesize,                                        int w, int h);                ptop_field_len = q;                q += 2;                pbottom_field_len = q;                q += 2;                if (bpp_index == 0)                    dvb_encode_rle = dvb_encode_rle2;                else                    dvb_encode_rle = dvb_encode_rle4;                top_ptr = q;                dvb_encode_rle(&q, h->rects[object_id].bitmap, h->rects[object_id].w * 2,                                    h->rects[object_id].w, h->rects[object_id].h >> 1);                bottom_ptr = q;                dvb_encode_rle(&q, h->rects[object_id].bitmap + h->rects[object_id].w,                                    h->rects[object_id].w * 2, h->rects[object_id].w,                                    h->rects[object_id].h >> 1);                putbe16(&ptop_field_len, bottom_ptr - top_ptr);                putbe16(&pbottom_field_len, q - bottom_ptr);            }            putbe16(&pseg_len, q - pseg_len - 2);        }    }    /* end of display set segment */    *q++ = 0x0f; /* sync_byte */    *q++ = 0x80; /* segment_type */    putbe16(&q, page_id);    pseg_len = q;    q += 2; /* segment length */    putbe16(&pseg_len, q - pseg_len - 2);    *q++ = 0xff; /* end of PES data */    s->object_version = (s->object_version + 1) & 0xf;    s->hide_state = !s->hide_state;    return q - outbuf;}