| 1 | /* |
| 2 | * LOAS AudioSyncStream demuxer |
| 3 | * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/intreadwrite.h" |
| 23 | #include "libavutil/internal.h" |
| 24 | #include "avformat.h" |
| 25 | #include "internal.h" |
| 26 | #include "rawdec.h" |
| 27 | |
| 28 | #define LOAS_SYNC_WORD 0x2b7 |
| 29 | |
| 30 | static int loas_probe(AVProbeData *p) |
| 31 | { |
| 32 | int max_frames = 0, first_frames = 0; |
| 33 | int fsize, frames; |
| 34 | const uint8_t *buf0 = p->buf; |
| 35 | const uint8_t *buf2; |
| 36 | const uint8_t *buf; |
| 37 | const uint8_t *end = buf0 + p->buf_size - 3; |
| 38 | buf = buf0; |
| 39 | |
| 40 | for (; buf < end; buf = buf2 + 1) { |
| 41 | buf2 = buf; |
| 42 | |
| 43 | for (frames = 0; buf2 < end; frames++) { |
| 44 | uint32_t header = AV_RB24(buf2); |
| 45 | if ((header >> 13) != LOAS_SYNC_WORD) |
| 46 | break; |
| 47 | fsize = (header & 0x1FFF) + 3; |
| 48 | if (fsize < 7) |
| 49 | break; |
| 50 | fsize = FFMIN(fsize, end - buf2); |
| 51 | buf2 += fsize; |
| 52 | } |
| 53 | max_frames = FFMAX(max_frames, frames); |
| 54 | if (buf == buf0) |
| 55 | first_frames = frames; |
| 56 | } |
| 57 | |
| 58 | if (first_frames >= 3) |
| 59 | return AVPROBE_SCORE_EXTENSION + 1; |
| 60 | else if (max_frames > 100) |
| 61 | return AVPROBE_SCORE_EXTENSION; |
| 62 | else if (max_frames >= 3) |
| 63 | return AVPROBE_SCORE_EXTENSION / 2; |
| 64 | else |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | static int loas_read_header(AVFormatContext *s) |
| 69 | { |
| 70 | AVStream *st; |
| 71 | |
| 72 | st = avformat_new_stream(s, NULL); |
| 73 | if (!st) |
| 74 | return AVERROR(ENOMEM); |
| 75 | |
| 76 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 77 | st->codec->codec_id = s->iformat->raw_codec_id; |
| 78 | st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
| 79 | |
| 80 | //LCM of all possible AAC sample rates |
| 81 | avpriv_set_pts_info(st, 64, 1, 28224000); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | AVInputFormat ff_loas_demuxer = { |
| 87 | .name = "loas", |
| 88 | .long_name = NULL_IF_CONFIG_SMALL("LOAS AudioSyncStream"), |
| 89 | .read_probe = loas_probe, |
| 90 | .read_header = loas_read_header, |
| 91 | .read_packet = ff_raw_read_partial_packet, |
| 92 | .flags= AVFMT_GENERIC_INDEX, |
| 93 | .raw_codec_id = AV_CODEC_ID_AAC_LATM, |
| 94 | }; |