diff options
Diffstat (limited to '')
-rw-r--r-- | third_party/aom/aom_dsp/bitreader.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/bitreader.c b/third_party/aom/aom_dsp/bitreader.c new file mode 100644 index 0000000000..4c70a91712 --- /dev/null +++ b/third_party/aom/aom_dsp/bitreader.c @@ -0,0 +1,41 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +#include "aom_dsp/bitreader.h" + +int aom_reader_init(aom_reader *r, const uint8_t *buffer, size_t size) { + if (size && !buffer) { + return 1; + } + r->buffer_end = buffer + size; + r->buffer = buffer; + od_ec_dec_init(&r->ec, buffer, (uint32_t)size); +#if CONFIG_ACCOUNTING + r->accounting = NULL; +#endif + return 0; +} + +const uint8_t *aom_reader_find_begin(aom_reader *r) { return r->buffer; } + +const uint8_t *aom_reader_find_end(aom_reader *r) { return r->buffer_end; } + +uint32_t aom_reader_tell(const aom_reader *r) { return od_ec_dec_tell(&r->ec); } + +uint32_t aom_reader_tell_frac(const aom_reader *r) { + return od_ec_dec_tell_frac(&r->ec); +} + +int aom_reader_has_overflowed(const aom_reader *r) { + const uint32_t tell_bits = aom_reader_tell(r); + const uint32_t tell_bytes = (tell_bits + 7) >> 3; + return ((ptrdiff_t)tell_bytes > r->buffer_end - r->buffer); +} |