blob: 0b868edcb25213293ab9d4c591887e6706c0fec6
1 | /* |
2 | * Audio and Video frame extraction |
3 | * Copyright (c) 2003 Fabrice Bellard |
4 | * Copyright (c) 2003 Michael Niedermayer |
5 | * |
6 | * This file is part of FFmpeg. |
7 | * |
8 | * FFmpeg is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU Lesser General Public |
10 | * License as published by the Free Software Foundation; either |
11 | * version 2.1 of the License, or (at your option) any later version. |
12 | * |
13 | * FFmpeg is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * Lesser General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU Lesser General Public |
19 | * License along with FFmpeg; if not, write to the Free Software |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
21 | */ |
22 | |
23 | #include "parser.h" |
24 | #include "aac_ac3_parser.h" |
25 | #include "aacadtsdec.h" |
26 | #include "get_bits.h" |
27 | #include "mpeg4audio.h" |
28 | |
29 | static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info, |
30 | int *need_next_header, int *new_frame_start) |
31 | { |
32 | GetBitContext bits; |
33 | AACADTSHeaderInfo hdr; |
34 | int size; |
35 | union { |
36 | uint64_t u64; |
37 | uint8_t u8[8 + AV_INPUT_BUFFER_PADDING_SIZE]; |
38 | } tmp; |
39 | |
40 | tmp.u64 = av_be2ne64(state); |
41 | init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8); |
42 | |
43 | if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0) |
44 | return 0; |
45 | *need_next_header = 0; |
46 | *new_frame_start = 1; |
47 | hdr_info->sample_rate = hdr.sample_rate; |
48 | hdr_info->channels = ff_mpeg4audio_channels[hdr.chan_config]; |
49 | hdr_info->samples = hdr.samples; |
50 | hdr_info->bit_rate = hdr.bit_rate; |
51 | return size; |
52 | } |
53 | |
54 | static av_cold int aac_parse_init(AVCodecParserContext *s1) |
55 | { |
56 | AACAC3ParseContext *s = s1->priv_data; |
57 | s->header_size = AAC_ADTS_HEADER_SIZE; |
58 | s->sync = aac_sync; |
59 | return 0; |
60 | } |
61 | |
62 | |
63 | AVCodecParser ff_aac_parser = { |
64 | .codec_ids = { AV_CODEC_ID_AAC }, |
65 | .priv_data_size = sizeof(AACAC3ParseContext), |
66 | .parser_init = aac_parse_init, |
67 | .parser_parse = ff_aac_ac3_parse, |
68 | .parser_close = ff_parse_close, |
69 | }; |
70 |