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dvbsubdec: add version checking 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
JULIAN GARDNER 2011-10-14 16:41:21 +02:00 committed by Michael Niedermayer
parent 1fc7b0ed5a
commit 0f8d77199a
1 changed files with 27 additions and 1 deletions
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28
libavcodec/dvbsubdec.c
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@ -154,6 +154,7 @@ static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
typedef struct DVBSubCLUT {
int id;
int version;
uint32_t clut4[4];
uint32_t clut16[16];
@ -180,6 +181,7 @@ typedef struct DVBSubObjectDisplay {
typedef struct DVBSubObject {
int id;
int version;
int type;
@ -199,6 +201,7 @@ typedef struct DVBSubRegionDisplay {
typedef struct DVBSubRegion {
int id;
int version;
int width;
int height;
@ -229,6 +232,7 @@ typedef struct DVBSubContext {
int composition_id;
int ancillary_id;
int version;
int time_out;
DVBSubRegion *region_list;
DVBSubCLUT *clut_list;
@ -375,6 +379,8 @@ static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
}
ctx->version = -1;
default_clut.id = -1;
default_clut.next = NULL;
@ -928,6 +934,7 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
const uint8_t *buf_end = buf + buf_size;
int i, clut_id;
int version;
DVBSubCLUT *clut;
int entry_id, depth , full_range;
int y, cr, cb, alpha;
@ -945,6 +952,7 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
av_dlog(avctx, "\n");
clut_id = *buf++;
version = ((*buf)>>4)&15;
buf += 1;
clut = get_clut(ctx, clut_id);
@ -955,11 +963,16 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
clut->id = clut_id;
clut->version = -1;
clut->next = ctx->clut_list;
ctx->clut_list = clut;
}
if (clut->version != version) {
clut->version = version;
while (buf + 4 < buf_end) {
entry_id = *buf++;
@ -1001,6 +1014,7 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
if (depth & 0x20)
clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
}
}
}
@ -1011,6 +1025,7 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
const uint8_t *buf_end = buf + buf_size;
int region_id, object_id;
int version;
DVBSubRegion *region;
DVBSubObject *object;
DVBSubObjectDisplay *display;
@ -1027,11 +1042,13 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
region = av_mallocz(sizeof(DVBSubRegion));
region->id = region_id;
region->version = -1;
region->next = ctx->region_list;
ctx->region_list = region;
}
version = ((*buf)>>4) & 15;
fill = ((*buf++) >> 3) & 1;
region->width = AV_RB16(buf);
@ -1127,13 +1144,21 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
const uint8_t *buf_end = buf + buf_size;
int region_id;
int page_state;
int timeout;
int version;
if (buf_size < 1)
return;
ctx->time_out = *buf++;
timeout = *buf++;
version = ((*buf)>>4) & 15;
page_state = ((*buf++) >> 2) & 3;
if (ctx->version != version) {
ctx->time_out = timeout;
ctx->version = version;
av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
if (page_state == 1 || page_state == 2) {
@ -1184,6 +1209,7 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
av_free(display);
}
}
}