* DVD subtitle decoding
* Copyright (c) 2005 Fabrice Bellard
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "libavutil/colorspace.h"
+#include "libavutil/imgutils.h"
//#define DEBUG
+typedef struct DVDSubContext
+{
+ uint32_t palette[16];
+ int has_palette;
+ uint8_t colormap[4];
+ uint8_t alpha[256];
+} DVDSubContext;
+
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
{
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
}
static void guess_palette(uint32_t *rgba_palette,
- uint8_t *colormap,
- uint8_t *alpha,
+ DVDSubContext* ctx,
uint32_t subtitle_color)
{
+ static const uint8_t level_map[4][4] = {
+ // this configuration (full range, lowest to highest) in tests
+ // seemed most common, so assume this
+ {0xff},
+ {0x00, 0xff},
+ {0x00, 0x80, 0xff},
+ {0x00, 0x55, 0xaa, 0xff},
+ };
uint8_t color_used[16] = { 0 };
int nb_opaque_colors, i, level, j, r, g, b;
+ uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
+
+ if(ctx->has_palette) {
+ for(i = 0; i < 4; i++)
+ rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
+ | ((alpha[i] * 17) << 24);
+ return;
+ }
for(i = 0; i < 4; i++)
rgba_palette[i] = 0;
if (nb_opaque_colors == 0)
return;
- j = nb_opaque_colors;
+ j = 0;
memset(color_used, 0, 16);
for(i = 0; i < 4; i++) {
if (alpha[i] != 0) {
if (!color_used[colormap[i]]) {
- level = (0xff * j) / nb_opaque_colors;
+ level = level_map[nb_opaque_colors][j];
r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);
color_used[colormap[i]] = (i + 1);
- j--;
+ j++;
} else {
rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
((alpha[i] * 17) << 24);
#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
-static int decode_dvd_subtitles(AVSubtitle *sub_header,
+static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
const uint8_t *buf, int buf_size)
{
int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
int big_offsets, offset_size, is_8bit = 0;
const uint8_t *yuv_palette = 0;
- uint8_t colormap[4], alpha[256];
+ uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
int date;
int i;
int is_menu = 0;
if (buf_size < 10)
return -1;
- memset(sub_header, 0, sizeof(*sub_header));
if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
big_offsets = 1;
yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);
} else {
sub_header->rects[0]->nb_colors = 4;
- guess_palette((uint32_t*)sub_header->rects[0]->pict.data[1],
- colormap, alpha, 0xffff00);
+ guess_palette((uint32_t*)sub_header->rects[0]->pict.data[1], ctx,
+ 0xffff00);
}
sub_header->rects[0]->x = x1;
sub_header->rects[0]->y = y1;
sub_header->rects[0]->h = h;
sub_header->rects[0]->type = SUBTITLE_BITMAP;
sub_header->rects[0]->pict.linesize[0] = w;
+ sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
}
}
+ if (next_cmd_pos < cmd_pos) {
+ av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n");
+ break;
+ }
if (next_cmd_pos == cmd_pos)
break;
cmd_pos = next_cmd_pos;
void *data, int *data_size,
AVPacket *avpkt)
{
+ DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVSubtitle *sub = data;
int is_menu;
- is_menu = decode_dvd_subtitles(sub, buf, buf_size);
+ is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
if (is_menu < 0) {
no_subtitle:
return buf_size;
}
+static int dvdsub_init(AVCodecContext *avctx)
+{
+ DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
+ char *dataorig, *data;
+
+ if (!avctx->extradata || !avctx->extradata_size)
+ return 1;
+
+ dataorig = data = av_malloc(avctx->extradata_size+1);
+ if (!data)
+ return AVERROR(ENOMEM);
+ memcpy(data, avctx->extradata, avctx->extradata_size);
+ data[avctx->extradata_size] = '\0';
+
+ for(;;) {
+ int pos = strcspn(data, "\n\r");
+ if (pos==0 && *data==0)
+ break;
+
+ if (strncmp("palette:", data, 8) == 0) {
+ int i;
+ char *p = data+8;
+ ctx->has_palette = 1;
+ for(i=0;i<16;i++) {
+ ctx->palette[i] = strtoul(p, &p, 16);
+ while(*p == ',' || isspace(*p))
+ p++;
+ }
+ } else if (strncmp("size:", data, 5) == 0) {
+ int w, h;
+ if (sscanf(data + 5, "%dx%d", &w, &h) == 2 &&
+ av_image_check_size(w, h, 0, avctx) >= 0)
+ avcodec_set_dimensions(avctx, w, h);
+ }
+
+ data += pos;
+ data += strspn(data, "\n\r");
+ }
+
+ if (ctx->has_palette) {
+ int i;
+ av_log(avctx, AV_LOG_DEBUG, "palette:");
+ for(i=0;i<16;i++)
+ av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);
+ av_log(avctx, AV_LOG_DEBUG, "\n");
+ }
+
+ av_free(dataorig);
+ return 1;
+}
+
AVCodec ff_dvdsub_decoder = {
.name = "dvdsub",
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_DVD_SUBTITLE,
+ .priv_data_size = sizeof(DVDSubContext),
+ .init = dvdsub_init,
.decode = dvdsub_decode,
.long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
};
projects / ffmpeg / blobdiff