static int encode_dvb_subtitles(DVBSubtitleContext *s, uint8_t *outbuf, const 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 */ bytestream_put_be16(&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 << 4) | (page_state << 2) | 3; for (region_id = 0; region_id < h->num_rects; region_id++) { *q++ = region_id; *q++ = 0xff; /* reserved */ bytestream_put_be16(&q, h->rects[region_id]->x); /* left pos */ bytestream_put_be16(&q, h->rects[region_id]->y); /* top pos */ } bytestream_put_be16(&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 */ bytestream_put_be16(&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; uint32_t x= ((uint32_t*)h->rects[clut_id]->pict.data[1])[i]; a = (x >> 24) & 0xff; r = (x >> 16) & 0xff; g = (x >> 8) & 0xff; b = (x >> 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; } } bytestream_put_be16(&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 */ bytestream_put_be16(&q, page_id); pseg_len = q; q += 2; /* segment length */ *q++ = region_id; *q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */ bytestream_put_be16(&q, h->rects[region_id]->w); /* region width */ bytestream_put_be16(&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) { bytestream_put_be16(&q, region_id); /* object_id == region_id */ *q++ = (0 << 6) | (0 << 4); *q++ = 0; *q++ = 0xf0; *q++ = 0; } bytestream_put_be16(&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[object_id]->nb_colors <= 4) { /* 2 bpp, some decoders do not support it correctly */ bpp_index = 0; } else if (h->rects[object_id]->nb_colors <= 16) { /* 4 bpp, standard encoding */ bpp_index = 1; } else { return -1; } *q++ = 0x0f; /* sync byte */ *q++ = 0x13; bytestream_put_be16(&q, page_id); pseg_len = q; q += 2; /* segment length */ bytestream_put_be16(&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]->pict.data[0], 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]->pict.data[0] + h->rects[object_id]->w, h->rects[object_id]->w * 2, h->rects[object_id]->w, h->rects[object_id]->h >> 1); bytestream_put_be16(&ptop_field_len, bottom_ptr - top_ptr); bytestream_put_be16(&pbottom_field_len, q - bottom_ptr); } bytestream_put_be16(&pseg_len, q - pseg_len - 2); } } /* end of display set segment */ *q++ = 0x0f; /* sync_byte */ *q++ = 0x80; /* segment_type */ bytestream_put_be16(&q, page_id); pseg_len = q; q += 2; /* segment length */ bytestream_put_be16(&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; }