DVB subtitle decoder by (Ian Caulfield: imc25, cam ac uk)
Originally committed as revision 4448 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
@@ -225,18 +225,9 @@ static int encode_dvb_subtitles(DVBSubtitleContext *s,
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q = outbuf;
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page_id = 1;
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region_id = 0;
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clut_id = 0;
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object_id = 0;
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if (h->nb_colors <= 4) {
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/* 2 bpp, some decoders do not support it correctly */
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bpp_index = 0;
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} else if (h->nb_colors <= 16) {
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/* 4 bpp, standard encoding */
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bpp_index = 1;
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} else {
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if (h->num_rects == 0 || h->rects == NULL)
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return -1;
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}
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*q++ = 0x00; /* subtitle_stream_id */
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@@ -254,108 +245,153 @@ static int encode_dvb_subtitles(DVBSubtitleContext *s,
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page_state = 2; /* mode change */
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/* page_version = 0 + page_state */
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*q++ = s->object_version | (page_state << 2) | 3;
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*q++ = region_id;
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*q++ = 0xff; /* reserved */
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putbe16(&q, 0); /* left pos */
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putbe16(&q, 0); /* top pos */
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for (region_id = 0; region_id < h->num_rects; region_id++) {
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*q++ = region_id;
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*q++ = 0xff; /* reserved */
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putbe16(&q, h->rects[region_id].x); /* left pos */
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putbe16(&q, h->rects[region_id].y); /* top pos */
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}
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putbe16(&pseg_len, q - pseg_len - 2);
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if (!s->hide_state) {
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/* CLUT segment */
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for (clut_id = 0; clut_id < h->num_rects; clut_id++) {
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/* CLUT segment */
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if (h->rects[clut_id].nb_colors <= 4) {
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/* 2 bpp, some decoders do not support it correctly */
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bpp_index = 0;
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} else if (h->rects[clut_id].nb_colors <= 16) {
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/* 4 bpp, standard encoding */
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bpp_index = 1;
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} else {
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return -1;
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}
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*q++ = 0x0f; /* sync byte */
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*q++ = 0x12; /* CLUT definition segment */
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putbe16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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*q++ = clut_id;
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*q++ = (0 << 4) | 0xf; /* version = 0 */
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for(i = 0; i < h->rects[clut_id].nb_colors; i++) {
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*q++ = i; /* clut_entry_id */
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*q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
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{
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int a, r, g, b;
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a = (h->rects[clut_id].rgba_palette[i] >> 24) & 0xff;
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r = (h->rects[clut_id].rgba_palette[i] >> 16) & 0xff;
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g = (h->rects[clut_id].rgba_palette[i] >> 8) & 0xff;
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b = (h->rects[clut_id].rgba_palette[i] >> 0) & 0xff;
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*q++ = RGB_TO_Y_CCIR(r, g, b);
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*q++ = RGB_TO_V_CCIR(r, g, b, 0);
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*q++ = RGB_TO_U_CCIR(r, g, b, 0);
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*q++ = 255 - a;
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}
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}
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putbe16(&pseg_len, q - pseg_len - 2);
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}
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}
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for (region_id = 0; region_id < h->num_rects; region_id++) {
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/* region composition segment */
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*q++ = 0x0f; /* sync byte */
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*q++ = 0x12; /* CLUT definition segment */
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if (h->rects[region_id].nb_colors <= 4) {
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/* 2 bpp, some decoders do not support it correctly */
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bpp_index = 0;
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} else if (h->rects[region_id].nb_colors <= 16) {
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/* 4 bpp, standard encoding */
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bpp_index = 1;
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} else {
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return -1;
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}
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*q++ = 0x0f; /* sync_byte */
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*q++ = 0x11; /* segment_type */
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putbe16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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*q++ = clut_id;
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*q++ = (0 << 4) | 0xf; /* version = 0 */
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for(i = 0; i < h->nb_colors; i++) {
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*q++ = i; /* clut_entry_id */
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*q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
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{
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int a, r, g, b;
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a = (h->rgba_palette[i] >> 24) & 0xff;
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r = (h->rgba_palette[i] >> 16) & 0xff;
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g = (h->rgba_palette[i] >> 8) & 0xff;
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b = (h->rgba_palette[i] >> 0) & 0xff;
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*q++ = RGB_TO_Y_CCIR(r, g, b);
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*q++ = RGB_TO_V_CCIR(r, g, b, 0);
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*q++ = RGB_TO_U_CCIR(r, g, b, 0);
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*q++ = 255 - a;
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}
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*q++ = region_id;
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*q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
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putbe16(&q, h->rects[region_id].w); /* region width */
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putbe16(&q, h->rects[region_id].h); /* region height */
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*q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
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*q++ = region_id; /* clut_id == region_id */
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*q++ = 0; /* 8 bit fill colors */
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*q++ = 0x03; /* 4 bit and 2 bit fill colors */
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if (!s->hide_state) {
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putbe16(&q, region_id); /* object_id == region_id */
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*q++ = (0 << 6) | (0 << 4);
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*q++ = 0;
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*q++ = 0xf0;
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*q++ = 0;
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}
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putbe16(&pseg_len, q - pseg_len - 2);
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}
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/* region composition segment */
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*q++ = 0x0f; /* sync_byte */
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*q++ = 0x11; /* segment_type */
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putbe16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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*q++ = region_id;
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*q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
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putbe16(&q, 720); /* region width */
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putbe16(&q, 576); /* region height */
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*q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
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*q++ = clut_id;
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*q++ = 0; /* 8 bit fill colors */
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*q++ = 0x03; /* 4 bit and 2 bit fill colors */
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if (!s->hide_state) {
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putbe16(&q, object_id);
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*q++ = (0 << 6) | (0 << 4) | ((h->x >> 8) & 0xf);
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*q++ = h->x;
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*q++ = 0xf0 | ((h->y >> 8) & 0xf);
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*q++ = h->y;
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}
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putbe16(&pseg_len, q - pseg_len - 2);
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if (!s->hide_state) {
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/* Object Data segment */
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for (object_id = 0; object_id < h->num_rects; object_id++) {
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/* Object Data segment */
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*q++ = 0x0f; /* sync byte */
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*q++ = 0x13;
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putbe16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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putbe16(&q, object_id);
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*q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
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onject_coding_method,
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non_modifying_color_flag */
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{
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uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
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void (*dvb_encode_rle)(uint8_t **pq,
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const uint8_t *bitmap, int linesize,
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int w, int h);
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ptop_field_len = q;
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q += 2;
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pbottom_field_len = q;
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q += 2;
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if (h->rects[region_id].nb_colors <= 4) {
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/* 2 bpp, some decoders do not support it correctly */
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bpp_index = 0;
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} else if (h->rects[region_id].nb_colors <= 16) {
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/* 4 bpp, standard encoding */
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bpp_index = 1;
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} else {
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return -1;
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}
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if (bpp_index == 0)
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dvb_encode_rle = dvb_encode_rle2;
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else
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dvb_encode_rle = dvb_encode_rle4;
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top_ptr = q;
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dvb_encode_rle(&q, h->bitmap, h->w * 2, h->w, h->h >> 1);
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bottom_ptr = q;
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dvb_encode_rle(&q, h->bitmap + h->w, h->w * 2, h->w, h->h >> 1);
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*q++ = 0x0f; /* sync byte */
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*q++ = 0x13;
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putbe16(&q, page_id);
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pseg_len = q;
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q += 2; /* segment length */
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putbe16(&ptop_field_len, bottom_ptr - top_ptr);
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putbe16(&pbottom_field_len, q - bottom_ptr);
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}
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putbe16(&q, object_id);
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*q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
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onject_coding_method,
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non_modifying_color_flag */
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{
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uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
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void (*dvb_encode_rle)(uint8_t **pq,
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const uint8_t *bitmap, int linesize,
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int w, int h);
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ptop_field_len = q;
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q += 2;
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pbottom_field_len = q;
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q += 2;
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putbe16(&pseg_len, q - pseg_len - 2);
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if (bpp_index == 0)
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dvb_encode_rle = dvb_encode_rle2;
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else
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dvb_encode_rle = dvb_encode_rle4;
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top_ptr = q;
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dvb_encode_rle(&q, h->rects[object_id].bitmap, h->rects[object_id].w * 2,
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h->rects[object_id].w, h->rects[object_id].h >> 1);
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bottom_ptr = q;
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dvb_encode_rle(&q, h->rects[object_id].bitmap + h->rects[object_id].w,
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h->rects[object_id].w * 2, h->rects[object_id].w,
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h->rects[object_id].h >> 1);
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putbe16(&ptop_field_len, bottom_ptr - top_ptr);
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putbe16(&pbottom_field_len, q - bottom_ptr);
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}
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putbe16(&pseg_len, q - pseg_len - 2);
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}
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}
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/* end of display set segment */
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