repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
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 + FF_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 | }; |