diff options
Diffstat (limited to 'third_party/aom/av1/common/obu_util.c')
| -rw-r--r-- | third_party/aom/av1/common/obu_util.c | 147 |
1 files changed, 0 insertions, 147 deletions
diff --git a/third_party/aom/av1/common/obu_util.c b/third_party/aom/av1/common/obu_util.c deleted file mode 100644 index 823b700b1..000000000 --- a/third_party/aom/av1/common/obu_util.c +++ /dev/null @@ -1,147 +0,0 @@ -/* - * Copyright (c) 2018, 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 "av1/common/obu_util.h" - -#include "aom_dsp/bitreader_buffer.h" - -// Returns 1 when OBU type is valid, and 0 otherwise. -static int valid_obu_type(int obu_type) { - int valid_type = 0; - switch (obu_type) { - case OBU_SEQUENCE_HEADER: - case OBU_TEMPORAL_DELIMITER: - case OBU_FRAME_HEADER: - case OBU_TILE_GROUP: - case OBU_METADATA: - case OBU_FRAME: - case OBU_REDUNDANT_FRAME_HEADER: - case OBU_TILE_LIST: - case OBU_PADDING: valid_type = 1; break; - default: break; - } - return valid_type; -} - -static aom_codec_err_t read_obu_size(const uint8_t *data, - size_t bytes_available, - size_t *const obu_size, - size_t *const length_field_size) { - uint64_t u_obu_size = 0; - if (aom_uleb_decode(data, bytes_available, &u_obu_size, length_field_size) != - 0) { - return AOM_CODEC_CORRUPT_FRAME; - } - - if (u_obu_size > UINT32_MAX) return AOM_CODEC_CORRUPT_FRAME; - *obu_size = (size_t)u_obu_size; - return AOM_CODEC_OK; -} - -// Parses OBU header and stores values in 'header'. -static aom_codec_err_t read_obu_header(struct aom_read_bit_buffer *rb, - int is_annexb, ObuHeader *header) { - if (!rb || !header) return AOM_CODEC_INVALID_PARAM; - - const ptrdiff_t bit_buffer_byte_length = rb->bit_buffer_end - rb->bit_buffer; - if (bit_buffer_byte_length < 1) return AOM_CODEC_CORRUPT_FRAME; - - header->size = 1; - - if (aom_rb_read_bit(rb) != 0) { - // Forbidden bit. Must not be set. - return AOM_CODEC_CORRUPT_FRAME; - } - - header->type = (OBU_TYPE)aom_rb_read_literal(rb, 4); - - if (!valid_obu_type(header->type)) return AOM_CODEC_CORRUPT_FRAME; - - header->has_extension = aom_rb_read_bit(rb); - header->has_size_field = aom_rb_read_bit(rb); - - if (!header->has_size_field && !is_annexb) { - // section 5 obu streams must have obu_size field set. - return AOM_CODEC_UNSUP_BITSTREAM; - } - - if (aom_rb_read_bit(rb) != 0) { - // obu_reserved_1bit must be set to 0. - return AOM_CODEC_CORRUPT_FRAME; - } - - if (header->has_extension) { - if (bit_buffer_byte_length == 1) return AOM_CODEC_CORRUPT_FRAME; - - header->size += 1; - header->temporal_layer_id = aom_rb_read_literal(rb, 3); - header->spatial_layer_id = aom_rb_read_literal(rb, 2); - if (aom_rb_read_literal(rb, 3) != 0) { - // extension_header_reserved_3bits must be set to 0. - return AOM_CODEC_CORRUPT_FRAME; - } - } - - return AOM_CODEC_OK; -} - -aom_codec_err_t aom_read_obu_header(uint8_t *buffer, size_t buffer_length, - size_t *consumed, ObuHeader *header, - int is_annexb) { - if (buffer_length < 1 || !consumed || !header) return AOM_CODEC_INVALID_PARAM; - - // TODO(tomfinegan): Set the error handler here and throughout this file, and - // confirm parsing work done via aom_read_bit_buffer is successful. - struct aom_read_bit_buffer rb = { buffer, buffer + buffer_length, 0, NULL, - NULL }; - aom_codec_err_t parse_result = read_obu_header(&rb, is_annexb, header); - if (parse_result == AOM_CODEC_OK) *consumed = header->size; - return parse_result; -} - -aom_codec_err_t aom_read_obu_header_and_size(const uint8_t *data, - size_t bytes_available, - int is_annexb, - ObuHeader *obu_header, - size_t *const payload_size, - size_t *const bytes_read) { - size_t length_field_size = 0, obu_size = 0; - aom_codec_err_t status; - - if (is_annexb) { - // Size field comes before the OBU header, and includes the OBU header - status = - read_obu_size(data, bytes_available, &obu_size, &length_field_size); - - if (status != AOM_CODEC_OK) return status; - } - - struct aom_read_bit_buffer rb = { data + length_field_size, - data + bytes_available, 0, NULL, NULL }; - - status = read_obu_header(&rb, is_annexb, obu_header); - if (status != AOM_CODEC_OK) return status; - - if (is_annexb) { - // Derive the payload size from the data we've already read - if (obu_size < obu_header->size) return AOM_CODEC_CORRUPT_FRAME; - - *payload_size = obu_size - obu_header->size; - } else { - // Size field comes after the OBU header, and is just the payload size - status = read_obu_size(data + obu_header->size, - bytes_available - obu_header->size, payload_size, - &length_field_size); - if (status != AOM_CODEC_OK) return status; - } - - *bytes_read = length_field_size + obu_header->size; - return AOM_CODEC_OK; -} |