diff options
Diffstat (limited to 'thirdparty/libvpx/vpx_dsp/bitreader.c')
-rw-r--r-- | thirdparty/libvpx/vpx_dsp/bitreader.c | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/thirdparty/libvpx/vpx_dsp/bitreader.c b/thirdparty/libvpx/vpx_dsp/bitreader.c deleted file mode 100644 index 8140e78e70..0000000000 --- a/thirdparty/libvpx/vpx_dsp/bitreader.c +++ /dev/null @@ -1,103 +0,0 @@ -/* - * Copyright (c) 2010 The WebM project authors. All Rights Reserved. - * - * Use of this source code is governed by a BSD-style license - * that can be found in the LICENSE file in the root of the source - * tree. An additional intellectual property rights grant can be found - * in the file PATENTS. All contributing project authors may - * be found in the AUTHORS file in the root of the source tree. - */ -#include <stdlib.h> - -#include "./vpx_config.h" - -#include "vpx_dsp/bitreader.h" -#include "vpx_dsp/prob.h" -#include "vpx_dsp/vpx_dsp_common.h" -#include "vpx_ports/mem.h" -#include "vpx_mem/vpx_mem.h" -#include "vpx_util/endian_inl.h" - -int vpx_reader_init(vpx_reader *r, - const uint8_t *buffer, - size_t size, - vpx_decrypt_cb decrypt_cb, - void *decrypt_state) { - if (size && !buffer) { - return 1; - } else { - r->buffer_end = buffer + size; - r->buffer = buffer; - r->value = 0; - r->count = -8; - r->range = 255; - r->decrypt_cb = decrypt_cb; - r->decrypt_state = decrypt_state; - vpx_reader_fill(r); - return vpx_read_bit(r) != 0; // marker bit - } -} - -void vpx_reader_fill(vpx_reader *r) { - const uint8_t *const buffer_end = r->buffer_end; - const uint8_t *buffer = r->buffer; - const uint8_t *buffer_start = buffer; - BD_VALUE value = r->value; - int count = r->count; - const size_t bytes_left = buffer_end - buffer; - const size_t bits_left = bytes_left * CHAR_BIT; - int shift = BD_VALUE_SIZE - CHAR_BIT - (count + CHAR_BIT); - - if (r->decrypt_cb) { - size_t n = VPXMIN(sizeof(r->clear_buffer), bytes_left); - r->decrypt_cb(r->decrypt_state, buffer, r->clear_buffer, (int)n); - buffer = r->clear_buffer; - buffer_start = r->clear_buffer; - } - if (bits_left > BD_VALUE_SIZE) { - const int bits = (shift & 0xfffffff8) + CHAR_BIT; - BD_VALUE nv; - BD_VALUE big_endian_values; - memcpy(&big_endian_values, buffer, sizeof(BD_VALUE)); -#if SIZE_MAX == 0xffffffffffffffffULL - big_endian_values = HToBE64(big_endian_values); -#else - big_endian_values = HToBE32(big_endian_values); -#endif - nv = big_endian_values >> (BD_VALUE_SIZE - bits); - count += bits; - buffer += (bits >> 3); - value = r->value | (nv << (shift & 0x7)); - } else { - const int bits_over = (int)(shift + CHAR_BIT - (int)bits_left); - int loop_end = 0; - if (bits_over >= 0) { - count += LOTS_OF_BITS; - loop_end = bits_over; - } - - if (bits_over < 0 || bits_left) { - while (shift >= loop_end) { - count += CHAR_BIT; - value |= (BD_VALUE)*buffer++ << shift; - shift -= CHAR_BIT; - } - } - } - - // NOTE: Variable 'buffer' may not relate to 'r->buffer' after decryption, - // so we increase 'r->buffer' by the amount that 'buffer' moved, rather than - // assign 'buffer' to 'r->buffer'. - r->buffer += buffer - buffer_start; - r->value = value; - r->count = count; -} - -const uint8_t *vpx_reader_find_end(vpx_reader *r) { - // Find the end of the coded buffer - while (r->count > CHAR_BIT && r->count < BD_VALUE_SIZE) { - r->count -= CHAR_BIT; - r->buffer--; - } - return r->buffer; -} |