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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Audio and Video frame extraction |
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| 3 | * Copyright (c) 2003 Fabrice Bellard |
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| 4 | * Copyright (c) 2003 Michael Niedermayer |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #include "parser.h" |
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| 24 | #include "aac_ac3_parser.h" |
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| 25 | #include "aacadtsdec.h" |
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| 26 | #include "get_bits.h" |
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| 27 | #include "mpeg4audio.h" |
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| 28 | |||
| 29 | static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info, |
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| 30 | int *need_next_header, int *new_frame_start) |
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| 31 | { |
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| 32 | GetBitContext bits; |
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| 33 | AACADTSHeaderInfo hdr; |
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| 34 | int size; |
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| 35 | union { |
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| 36 | uint64_t u64; |
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| 37 | uint8_t u8[8]; |
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| 38 | } tmp; |
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| 39 | |||
| 40 | tmp.u64 = av_be2ne64(state); |
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| 41 | init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8); |
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| 42 | |||
| 43 | if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0) |
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| 44 | return 0; |
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| 45 | *need_next_header = 0; |
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| 46 | *new_frame_start = 1; |
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| 47 | hdr_info->sample_rate = hdr.sample_rate; |
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| 48 | hdr_info->channels = ff_mpeg4audio_channels[hdr.chan_config]; |
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| 49 | hdr_info->samples = hdr.samples; |
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| 50 | hdr_info->bit_rate = hdr.bit_rate; |
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| 51 | return size; |
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| 52 | } |
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| 53 | |||
| 54 | static av_cold int aac_parse_init(AVCodecParserContext *s1) |
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| 55 | { |
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| 56 | AACAC3ParseContext *s = s1->priv_data; |
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| 57 | s->header_size = AAC_ADTS_HEADER_SIZE; |
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| 58 | s->sync = aac_sync; |
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| 59 | return 0; |
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| 60 | } |
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| 61 | |||
| 62 | |||
| 63 | AVCodecParser ff_aac_parser = { |
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| 64 | .codec_ids = { AV_CODEC_ID_AAC }, |
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| 65 | .priv_data_size = sizeof(AACAC3ParseContext), |
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| 66 | .parser_init = aac_parse_init, |
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| 67 | .parser_parse = ff_aac_ac3_parse, |
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| 68 | .parser_close = ff_parse_close, |
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| 69 | }; |