| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Audio and Video frame extraction | ||
| 3 | * Copyright (c) 2003 Fabrice Bellard | ||
| 4 | * Copyright (c) 2003 Michael Niedermayer | ||
| 5 | * Copyright (c) 2009 Alex Converse | ||
| 6 | * | ||
| 7 | * This file is part of FFmpeg. | ||
| 8 | * | ||
| 9 | * FFmpeg is free software; you can redistribute it and/or | ||
| 10 | * modify it under the terms of the GNU Lesser General Public | ||
| 11 | * License as published by the Free Software Foundation; either | ||
| 12 | * version 2.1 of the License, or (at your option) any later version. | ||
| 13 | * | ||
| 14 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 17 | * Lesser General Public License for more details. | ||
| 18 | * | ||
| 19 | * You should have received a copy of the GNU Lesser General Public | ||
| 20 | * License along with FFmpeg; if not, write to the Free Software | ||
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 22 | */ | ||
| 23 | |||
| 24 | #include "adts_header.h" | ||
| 25 | #include "adts_parser.h" | ||
| 26 | #include "get_bits.h" | ||
| 27 | #include "mpeg4audio.h" | ||
| 28 | #include "libavutil/avassert.h" | ||
| 29 | |||
| 30 | 51276 | int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr) | |
| 31 | { | ||
| 32 | int size, rdb, ch, sr; | ||
| 33 | int aot, crc_abs; | ||
| 34 | |||
| 35 | 51276 | memset(hdr, 0, sizeof(*hdr)); | |
| 36 | |||
| 37 |
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51276 | if (get_bits(gbc, 12) != 0xfff) |
| 38 | 35158 | return AAC_PARSE_ERROR_SYNC; | |
| 39 | |||
| 40 | 16118 | skip_bits1(gbc); /* id */ | |
| 41 | 16118 | skip_bits(gbc, 2); /* layer */ | |
| 42 | 16118 | crc_abs = get_bits1(gbc); /* protection_absent */ | |
| 43 | 16118 | aot = get_bits(gbc, 2); /* profile_objecttype */ | |
| 44 | 16118 | sr = get_bits(gbc, 4); /* sample_frequency_index */ | |
| 45 |
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16118 | if (!ff_mpeg4audio_sample_rates[sr]) |
| 46 | ✗ | return AAC_PARSE_ERROR_SAMPLE_RATE; | |
| 47 | 16118 | skip_bits1(gbc); /* private_bit */ | |
| 48 | 16118 | ch = get_bits(gbc, 3); /* channel_configuration */ | |
| 49 | |||
| 50 | 16118 | skip_bits1(gbc); /* original/copy */ | |
| 51 | 16118 | skip_bits1(gbc); /* home */ | |
| 52 | |||
| 53 | /* adts_variable_header */ | ||
| 54 | 16118 | skip_bits1(gbc); /* copyright_identification_bit */ | |
| 55 | 16118 | skip_bits1(gbc); /* copyright_identification_start */ | |
| 56 | 16118 | size = get_bits(gbc, 13); /* aac_frame_length */ | |
| 57 |
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16118 | if (size < AV_AAC_ADTS_HEADER_SIZE) |
| 58 | ✗ | return AAC_PARSE_ERROR_FRAME_SIZE; | |
| 59 | |||
| 60 | 16118 | skip_bits(gbc, 11); /* adts_buffer_fullness */ | |
| 61 | 16118 | rdb = get_bits(gbc, 2); /* number_of_raw_data_blocks_in_frame */ | |
| 62 | |||
| 63 | 16118 | hdr->object_type = aot + 1; | |
| 64 | 16118 | hdr->chan_config = ch; | |
| 65 | 16118 | hdr->crc_absent = crc_abs; | |
| 66 | 16118 | hdr->num_aac_frames = rdb + 1; | |
| 67 | 16118 | hdr->sampling_index = sr; | |
| 68 | 16118 | hdr->sample_rate = ff_mpeg4audio_sample_rates[sr]; | |
| 69 | 16118 | hdr->samples = (rdb + 1) * 1024; | |
| 70 | 16118 | hdr->bit_rate = size * 8 * hdr->sample_rate / hdr->samples; | |
| 71 | 16118 | hdr->frame_length = size; | |
| 72 | |||
| 73 | 16118 | return size; | |
| 74 | } | ||
| 75 | |||
| 76 | 47162 | int ff_adts_header_parse_buf(const uint8_t buf[AV_AAC_ADTS_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE], | |
| 77 | AACADTSHeaderInfo *hdr) | ||
| 78 | { | ||
| 79 | GetBitContext gb; | ||
| 80 | 47162 | av_unused int ret = init_get_bits8(&gb, buf, AV_AAC_ADTS_HEADER_SIZE); | |
| 81 | av_assert1(ret >= 0); | ||
| 82 | 47162 | return ff_adts_header_parse(&gb, hdr); | |
| 83 | } | ||
| 84 |