diff options
Diffstat (limited to 'third_party/aom/tools/obu_parser.cc')
| -rw-r--r-- | third_party/aom/tools/obu_parser.cc | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/third_party/aom/tools/obu_parser.cc b/third_party/aom/tools/obu_parser.cc deleted file mode 100644 index 7d71386ce..000000000 --- a/third_party/aom/tools/obu_parser.cc +++ /dev/null @@ -1,190 +0,0 @@ -/* - * Copyright (c) 2017, 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 <string.h> - -#include <cstdio> -#include <string> - -#include "aom/aom_codec.h" -#include "aom/aom_integer.h" -#include "aom_ports/mem_ops.h" -#include "av1/common/obu_util.h" -#include "tools/obu_parser.h" - -namespace aom_tools { - -// Basic OBU syntax -// 8 bits: Header -// 7 -// forbidden bit -// 6,5,4,3 -// type bits -// 2 -// extension flag bit -// 1 -// has size field bit -// 0 -// reserved bit -const uint32_t kObuForbiddenBitMask = 0x1; -const uint32_t kObuForbiddenBitShift = 7; -const uint32_t kObuTypeBitsMask = 0xF; -const uint32_t kObuTypeBitsShift = 3; -const uint32_t kObuExtensionFlagBitMask = 0x1; -const uint32_t kObuExtensionFlagBitShift = 2; -const uint32_t kObuHasSizeFieldBitMask = 0x1; -const uint32_t kObuHasSizeFieldBitShift = 1; - -// When extension flag bit is set: -// 8 bits: extension header -// 7,6,5 -// temporal ID -// 4,3 -// spatial ID -// 2,1,0 -// reserved bits -const uint32_t kObuExtTemporalIdBitsMask = 0x7; -const uint32_t kObuExtTemporalIdBitsShift = 5; -const uint32_t kObuExtSpatialIdBitsMask = 0x3; -const uint32_t kObuExtSpatialIdBitsShift = 3; - -bool ValidObuType(int obu_type) { - 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: return true; - } - return false; -} - -bool ParseObuHeader(uint8_t obu_header_byte, ObuHeader *obu_header) { - const int forbidden_bit = - (obu_header_byte >> kObuForbiddenBitShift) & kObuForbiddenBitMask; - if (forbidden_bit) { - fprintf(stderr, "Invalid OBU, forbidden bit set.\n"); - return false; - } - - obu_header->type = static_cast<OBU_TYPE>( - (obu_header_byte >> kObuTypeBitsShift) & kObuTypeBitsMask); - if (!ValidObuType(obu_header->type)) { - fprintf(stderr, "Invalid OBU type: %d.\n", obu_header->type); - return false; - } - - obu_header->has_extension = - (obu_header_byte >> kObuExtensionFlagBitShift) & kObuExtensionFlagBitMask; - obu_header->has_size_field = - (obu_header_byte >> kObuHasSizeFieldBitShift) & kObuHasSizeFieldBitMask; - return true; -} - -bool ParseObuExtensionHeader(uint8_t ext_header_byte, ObuHeader *obu_header) { - obu_header->temporal_layer_id = - (ext_header_byte >> kObuExtTemporalIdBitsShift) & - kObuExtTemporalIdBitsMask; - obu_header->spatial_layer_id = - (ext_header_byte >> kObuExtSpatialIdBitsShift) & kObuExtSpatialIdBitsMask; - - return true; -} - -void PrintObuHeader(const ObuHeader *header) { - printf( - " OBU type: %s\n" - " extension: %s\n", - aom_obu_type_to_string(static_cast<OBU_TYPE>(header->type)), - header->has_extension ? "yes" : "no"); - if (header->has_extension) { - printf( - " temporal_id: %d\n" - " spatial_id: %d\n", - header->temporal_layer_id, header->temporal_layer_id); - } -} - -bool DumpObu(const uint8_t *data, int length, int *obu_overhead_bytes) { - const int kObuHeaderSizeBytes = 1; - const int kMinimumBytesRequired = 1 + kObuHeaderSizeBytes; - int consumed = 0; - int obu_overhead = 0; - ObuHeader obu_header; - while (consumed < length) { - const int remaining = length - consumed; - if (remaining < kMinimumBytesRequired) { - fprintf(stderr, - "OBU parse error. Did not consume all data, %d bytes remain.\n", - remaining); - return false; - } - - int obu_header_size = 0; - - memset(&obu_header, 0, sizeof(obu_header)); - const uint8_t obu_header_byte = *(data + consumed); - if (!ParseObuHeader(obu_header_byte, &obu_header)) { - fprintf(stderr, "OBU parsing failed at offset %d.\n", consumed); - return false; - } - - ++obu_overhead; - ++obu_header_size; - - if (obu_header.has_extension) { - const uint8_t obu_ext_header_byte = - *(data + consumed + kObuHeaderSizeBytes); - if (!ParseObuExtensionHeader(obu_ext_header_byte, &obu_header)) { - fprintf(stderr, "OBU extension parsing failed at offset %d.\n", - consumed + kObuHeaderSizeBytes); - return false; - } - - ++obu_overhead; - ++obu_header_size; - } - - PrintObuHeader(&obu_header); - - uint64_t obu_size = 0; - size_t length_field_size = 0; - if (aom_uleb_decode(data + consumed + obu_header_size, - remaining - obu_header_size, &obu_size, - &length_field_size) != 0) { - fprintf(stderr, "OBU size parsing failed at offset %d.\n", - consumed + obu_header_size); - return false; - } - int current_obu_length = static_cast<int>(obu_size); - if (obu_header_size + static_cast<int>(length_field_size) + - current_obu_length > - remaining) { - fprintf(stderr, "OBU parsing failed: not enough OBU data.\n"); - return false; - } - consumed += obu_header_size + static_cast<int>(length_field_size) + - current_obu_length; - printf(" length: %d\n", - static_cast<int>(obu_header_size + length_field_size + - current_obu_length)); - } - - if (obu_overhead_bytes != nullptr) *obu_overhead_bytes = obu_overhead; - printf(" TU size: %d\n", consumed); - - return true; -} - -} // namespace aom_tools |