a3df343cda
For reading, this makes the operation branchless, although it still requires two shifts. For writing, this makes the operation as fast as writing an unsigned value, branchlessly. This is also how other codecs typically code signed, non-arithcoded bitstream elements. See issue 1039. Change-Id: I6a8182cc88a16842fb431688c38f6b52d7f24ead
39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
/*
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* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VPX_DSP_BITWRITER_BUFFER_H_
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#define VPX_DSP_BITWRITER_BUFFER_H_
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#include "vpx/vpx_integer.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct vpx_write_bit_buffer {
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uint8_t *bit_buffer;
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size_t bit_offset;
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};
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size_t vpx_wb_bytes_written(const struct vpx_write_bit_buffer *wb);
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void vpx_wb_write_bit(struct vpx_write_bit_buffer *wb, int bit);
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void vpx_wb_write_literal(struct vpx_write_bit_buffer *wb, int data, int bits);
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void vpx_wb_write_inv_signed_literal(struct vpx_write_bit_buffer *wb, int data,
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int bits);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_DSP_BITWRITER_BUFFER_H_
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