| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "demux.h" | ||
| 26 | #include "internal.h" | ||
| 27 | #include "rawdec.h" | ||
| 28 | |||
| 29 | #define LOAS_SYNC_WORD 0x2b7 | ||
| 30 | |||
| 31 | 7186 | static int loas_probe(const AVProbeData *p) | |
| 32 | { | ||
| 33 | 7186 | int max_frames = 0, first_frames = 0; | |
| 34 | int fsize, frames; | ||
| 35 | 7186 | const uint8_t *buf0 = p->buf; | |
| 36 | const uint8_t *buf2; | ||
| 37 | const uint8_t *buf; | ||
| 38 | 7186 | const uint8_t *end = buf0 + p->buf_size - 3; | |
| 39 | 7186 | buf = buf0; | |
| 40 | |||
| 41 |
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203211984 | for (; buf < end; buf = buf2 + 1) { |
| 42 | 203204798 | buf2 = buf; | |
| 43 | |||
| 44 |
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203251456 | for (frames = 0; buf2 < end; frames++) { |
| 45 | 203248757 | uint32_t header = AV_RB24(buf2); | |
| 46 |
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203248757 | if ((header >> 13) != LOAS_SYNC_WORD) |
| 47 | 203202097 | break; | |
| 48 | 46660 | fsize = (header & 0x1FFF) + 3; | |
| 49 |
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46660 | if (fsize < 7) |
| 50 | 2 | break; | |
| 51 | 46658 | fsize = FFMIN(fsize, end - buf2); | |
| 52 | 46658 | buf2 += fsize; | |
| 53 | } | ||
| 54 | 203204798 | max_frames = FFMAX(max_frames, frames); | |
| 55 |
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203204798 | if (buf == buf0) |
| 56 | 7186 | first_frames = frames; | |
| 57 | } | ||
| 58 | |||
| 59 |
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7186 | if (first_frames >= 3) |
| 60 | 6 | return AVPROBE_SCORE_EXTENSION + 1; | |
| 61 |
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7180 | else if (max_frames > 100) |
| 62 | ✗ | return AVPROBE_SCORE_EXTENSION; | |
| 63 |
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7180 | else if (max_frames >= 3) |
| 64 | ✗ | return AVPROBE_SCORE_EXTENSION / 2; | |
| 65 | else | ||
| 66 | 7180 | return 0; | |
| 67 | } | ||
| 68 | |||
| 69 | 1 | static int loas_read_header(AVFormatContext *s) | |
| 70 | { | ||
| 71 | AVStream *st; | ||
| 72 | |||
| 73 | 1 | st = avformat_new_stream(s, NULL); | |
| 74 |
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1 | if (!st) |
| 75 | ✗ | return AVERROR(ENOMEM); | |
| 76 | |||
| 77 | 1 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 78 | 1 | st->codecpar->codec_id = AV_CODEC_ID_AAC_LATM; | |
| 79 | 1 | ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW; | |
| 80 | |||
| 81 | //LCM of all possible AAC sample rates | ||
| 82 | 1 | avpriv_set_pts_info(st, 64, 1, 28224000); | |
| 83 | |||
| 84 | 1 | return 0; | |
| 85 | } | ||
| 86 | |||
| 87 | const FFInputFormat ff_loas_demuxer = { | ||
| 88 | .p.name = "loas", | ||
| 89 | .p.long_name = NULL_IF_CONFIG_SMALL("LOAS AudioSyncStream"), | ||
| 90 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 91 | .p.priv_class = &ff_raw_demuxer_class, | ||
| 92 | .read_probe = loas_probe, | ||
| 93 | .read_header = loas_read_header, | ||
| 94 | .read_packet = ff_raw_read_partial_packet, | ||
| 95 | .raw_codec_id = AV_CODEC_ID_AAC_LATM, | ||
| 96 | .priv_data_size = sizeof(FFRawDemuxerContext), | ||
| 97 | }; | ||
| 98 |