aac_parser: add required padding for GetBitContext buffer
[libav.git] / libavcodec / aac_parser.c
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1/*
2 * Audio and Video frame extraction
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3 * Copyright (c) 2003 Fabrice Bellard
4 * Copyright (c) 2003 Michael Niedermayer
99ff31dc 5 *
2912e87a 6 * This file is part of Libav.
99ff31dc 7 *
2912e87a 8 * Libav 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
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 *
2912e87a 13 * Libav 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
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
2912e87a 19 * License along with Libav; if not, write to the Free Software
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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"
3cac899a 25#include "aacadtsdec.h"
9106a698 26#include "get_bits.h"
bac47ae6 27#include "mpeg4audio.h"
99ff31dc 28
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29static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
30 int *need_next_header, int *new_frame_start)
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31{
32 GetBitContext bits;
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33 AACADTSHeaderInfo hdr;
34 int size;
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35 union {
36 uint64_t u64;
fb147308 37 uint8_t u8[8 + FF_INPUT_BUFFER_PADDING_SIZE];
cb56b440 38 } tmp;
99ff31dc 39
8fc0162a 40 tmp.u64 = av_be2ne64(state);
ee373ddf 41 init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8);
99ff31dc 42
73ae27e1 43 if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0)
99ff31dc 44 return 0;
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45 *need_next_header = 0;
46 *new_frame_start = 1;
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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;
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51 return size;
52}
53
98a6fff9 54static av_cold int aac_parse_init(AVCodecParserContext *s1)
99ff31dc 55{
679c2294 56 AACAC3ParseContext *s = s1->priv_data;
ee373ddf 57 s->header_size = AAC_ADTS_HEADER_SIZE;
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58 s->sync = aac_sync;
59 return 0;
60}
61
62
d36beb3f 63AVCodecParser ff_aac_parser = {
36ef5369 64 .codec_ids = { AV_CODEC_ID_AAC },
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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,
99ff31dc 69};