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avcodec/mpeg4videodec: Fix undefined shifts in mpeg4_decode_sprite_trajectory()

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Fixes: part of 670190.ogg

Found-by: Matt Wolenetz <wolenetz@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-12-09 17:01:14 +01:00
parent ee2a6f5df8
commit 8258e36385
1 changed files with 6 additions and 6 deletions
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12
libavcodec/mpeg4videodec.c
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@ -315,13 +315,13 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
min_ab = FFMIN(alpha, beta);
w3 = w2 >> min_ab;
h3 = h2 >> min_ab;
s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
s->sprite_offset[0][0] = (sprite_ref[0][0] * (1<<(alpha + beta + rho - min_ab))) +
(-r * sprite_ref[0][0] + virtual_ref[0][0]) *
h3 * (-vop_ref[0][0]) +
(-r * sprite_ref[0][0] + virtual_ref[1][0]) *
w3 * (-vop_ref[0][1]) +
(1 << (alpha + beta + rho - min_ab - 1));
s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
(-r * sprite_ref[0][1] + virtual_ref[0][1]) *
h3 * (-vop_ref[0][0]) +
(-r * sprite_ref[0][1] + virtual_ref[1][1]) *
@ -368,10 +368,10 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
int shift_y = 16 - ctx->sprite_shift[0];
int shift_c = 16 - ctx->sprite_shift[1];
for (i = 0; i < 2; i++) {
s->sprite_offset[0][i] <<= shift_y;
s->sprite_offset[1][i] <<= shift_c;
s->sprite_delta[0][i] <<= shift_y;
s->sprite_delta[1][i] <<= shift_y;
s->sprite_offset[0][i] *= 1 << shift_y;
s->sprite_offset[1][i] *= 1 << shift_c;
s->sprite_delta[0][i] *= 1 << shift_y;
s->sprite_delta[1][i] *= 1 << shift_y;
ctx->sprite_shift[i] = 16;
}
s->real_sprite_warping_points = ctx->num_sprite_warping_points;