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tinfoil patch: validate motion vectors and do not free frame on exit if

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frame is NULL; also removed some ancient MC code that did not perform
half-pel C-plane MC

Originally committed as revision 4514 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2005-08-13 18:25:17 +00:00
parent a06c7e07d7
commit b9029997d4
1 changed files with 18 additions and 45 deletions
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63
libavcodec/roqvideo.c
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@ -143,6 +143,14 @@ static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
mx = x + 8 - (mv >> 4) - mean_x;
my = y + 8 - (mv & 0xf) - mean_y;
/* check MV against frame boundaries */
if ((mx < 0) || (mx > ri->avctx->width - 4) ||
(my < 0) || (my > ri->avctx->height - 4)) {
av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
mx, my, ri->avctx->width, ri->avctx->height);
return;
}
pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
for(i = 0; i < 4; i++) {
@ -154,25 +162,6 @@ static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
pb += ri->y_stride;
}
#if 0
pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
for(i = 0; i < 2; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa += ri->c_stride;
pb += ri->c_stride;
}
pa = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
pb = ri->last_frame.data[2] + (my/2) * (ri->c_stride) + (mx + 1)/2;
for(i = 0; i < 2; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa += ri->c_stride;
pb += ri->c_stride;
}
#else
hw = ri->y_stride/2;
pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
@ -212,7 +201,6 @@ static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
#endif
}
static void apply_motion_8x8(RoqContext *ri, int x, int y,
@ -224,6 +212,14 @@ static void apply_motion_8x8(RoqContext *ri, int x, int y,
mx = x + 8 - (mv >> 4) - mean_x;
my = y + 8 - (mv & 0xf) - mean_y;
/* check MV against frame boundaries */
if ((mx < 0) || (mx > ri->avctx->width - 8) ||
(my < 0) || (my > ri->avctx->height - 8)) {
av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
mx, my, ri->avctx->width, ri->avctx->height);
return;
}
pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
for(i = 0; i < 8; i++) {
@ -239,29 +235,6 @@ static void apply_motion_8x8(RoqContext *ri, int x, int y,
pb += ri->y_stride;
}
#if 0
pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
for(i = 0; i < 4; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
pa += ri->c_stride;
pb += ri->c_stride;
}
pa = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
pb = ri->last_frame.data[2] + (my/2) * (ri->c_stride) + (mx + 1)/2;
for(i = 0; i < 4; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
pa += ri->c_stride;
pb += ri->c_stride;
}
#else
hw = ri->c_stride;
pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
@ -304,7 +277,6 @@ static void apply_motion_8x8(RoqContext *ri, int x, int y,
pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
#endif
}
static void roqvideo_decode_frame(RoqContext *ri)
@ -481,7 +453,8 @@ static int roq_decode_end(AVCodecContext *avctx)
RoqContext *s = avctx->priv_data;
/* release the last frame */
avctx->release_buffer(avctx, &s->last_frame);
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);
return 0;
}