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dvdsubdec: Support palette information for vobsub's stored as text in extradata 

This is how mkv's store palette information for vobsubs

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Joakim Plate 2011-09-11 19:02:09 +02:00 committed by Michael Niedermayer
parent 9765caec1b
commit 7009b96511
1 changed files with 66 additions and 3 deletions
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69
libavcodec/dvdsubdec.c
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@ -25,6 +25,12 @@
//#define DEBUG
typedef struct DVDSubContext
{
uint32_t palette[16];
int has_palette;
} 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;
@ -116,6 +122,7 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
}
static void guess_palette(uint32_t *rgba_palette,
DVDSubContext* ctx,
uint8_t *colormap,
uint8_t *alpha,
uint32_t subtitle_color)
@ -131,6 +138,13 @@ static void guess_palette(uint32_t *rgba_palette,
uint8_t color_used[16];
int nb_opaque_colors, i, level, j, r, g, b;
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;
@ -168,7 +182,7 @@ static void guess_palette(uint32_t *rgba_palette,
#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;
@ -333,7 +347,7 @@ static int decode_dvd_subtitles(AVSubtitle *sub_header,
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],
guess_palette((uint32_t*)sub_header->rects[0]->pict.data[1], ctx,
colormap, alpha, 0xffff00);
}
sub_header->rects[0]->x = x1;
@ -469,12 +483,13 @@ static int dvdsub_decode(AVCodecContext *avctx,
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:
@ -497,10 +512,58 @@ static int dvdsub_decode(AVCodecContext *avctx,
return buf_size;
}
static int dvdsub_init(AVCodecContext *avctx)
{
DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
char *data;
if (!avctx->extradata || !avctx->extradata_size)
return 1;
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++;
}
}
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(data);
return 1;
}
AVCodec ff_dvdsub_decoder = {
.name = "dvdsub",
.type = AVMEDIA_TYPE_SUBTITLE,
.id = CODEC_ID_DVD_SUBTITLE,
.priv_data_size = sizeof(DVDSubContext),
.init = dvdsub_init,
.decode = dvdsub_decode,
.long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
};