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cmdutils: avoid setting data pointers to invalid values in alloc_buffer()
Fixes bug 352.
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@ -1316,7 +1316,7 @@ static int alloc_buffer(FrameBuffer **pool, AVCodecContext *s, FrameBuffer **pbu
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const int v_shift = i==0 ? 0 : v_chroma_shift;
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if (s->flags & CODEC_FLAG_EMU_EDGE)
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buf->data[i] = buf->base[i];
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else
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else if (buf->base[i])
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buf->data[i] = buf->base[i] +
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FFALIGN((buf->linesize[i]*edge >> v_shift) +
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(pixel_size*edge >> h_shift), 32);
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