| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * HCOM demuxer | ||
| 3 | * Copyright (c) 2019 Paul B Mahol | ||
| 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 "avformat.h" | ||
| 24 | #include "demux.h" | ||
| 25 | #include "internal.h" | ||
| 26 | #include "pcm.h" | ||
| 27 | |||
| 28 | 7186 | static int hcom_probe(const AVProbeData *p) | |
| 29 | { | ||
| 30 |
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7186 | if (p->buf_size < 132) |
| 31 | 8 | return 0; | |
| 32 |
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7178 | if (!memcmp(p->buf+65, "FSSD", 4) && |
| 33 | ✗ | !memcmp(p->buf+128, "HCOM", 4)) | |
| 34 | ✗ | return AVPROBE_SCORE_MAX; | |
| 35 | 7178 | return 0; | |
| 36 | } | ||
| 37 | |||
| 38 | ✗ | static int hcom_read_header(AVFormatContext *s) | |
| 39 | { | ||
| 40 | AVStream *st; | ||
| 41 | av_unused unsigned data_size, rsrc_size, huffcount; | ||
| 42 | unsigned compresstype, divisor; | ||
| 43 | unsigned dict_entries; | ||
| 44 | int ret; | ||
| 45 | |||
| 46 | ✗ | avio_skip(s->pb, 83); | |
| 47 | ✗ | data_size = avio_rb32(s->pb); | |
| 48 | ✗ | rsrc_size = avio_rb32(s->pb); | |
| 49 | ✗ | avio_skip(s->pb, 128-91+4); | |
| 50 | ✗ | huffcount = avio_rb32(s->pb); | |
| 51 | ✗ | avio_skip(s->pb, 4); | |
| 52 | ✗ | compresstype = avio_rb32(s->pb); | |
| 53 | ✗ | if (compresstype > 1) | |
| 54 | ✗ | return AVERROR_INVALIDDATA; | |
| 55 | ✗ | divisor = avio_rb32(s->pb); | |
| 56 | ✗ | if (divisor == 0 || divisor > 4) | |
| 57 | ✗ | return AVERROR_INVALIDDATA; | |
| 58 | ✗ | dict_entries = avio_rb16(s->pb); | |
| 59 | |||
| 60 | ✗ | st = avformat_new_stream(s, NULL); | |
| 61 | ✗ | if (!st) | |
| 62 | ✗ | return AVERROR(ENOMEM); | |
| 63 | |||
| 64 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 65 | ✗ | st->codecpar->ch_layout.nb_channels = 1; | |
| 66 | ✗ | st->codecpar->sample_rate = 22050 / divisor; | |
| 67 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_HCOM; | |
| 68 | ✗ | st->codecpar->bits_per_coded_sample = 8; | |
| 69 | ✗ | st->codecpar->block_align = 4; | |
| 70 | |||
| 71 | ✗ | ret = ff_alloc_extradata(st->codecpar, dict_entries * 4 + 7); | |
| 72 | ✗ | if (ret < 0) | |
| 73 | ✗ | return ret; | |
| 74 | ✗ | AV_WB16(st->codecpar->extradata, dict_entries); | |
| 75 | ✗ | AV_WB32(st->codecpar->extradata + 2, compresstype); | |
| 76 | ✗ | avio_read(s->pb, st->codecpar->extradata + 6, dict_entries * 4); | |
| 77 | ✗ | avio_skip(s->pb, 1); | |
| 78 | ✗ | st->codecpar->extradata[dict_entries * 4 + 6] = avio_r8(s->pb); | |
| 79 | |||
| 80 | ✗ | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 81 | |||
| 82 | ✗ | return 0; | |
| 83 | } | ||
| 84 | |||
| 85 | const FFInputFormat ff_hcom_demuxer = { | ||
| 86 | .p.name = "hcom", | ||
| 87 | .p.long_name = NULL_IF_CONFIG_SMALL("Macintosh HCOM"), | ||
| 88 | .read_probe = hcom_probe, | ||
| 89 | .read_header = hcom_read_header, | ||
| 90 | .read_packet = ff_pcm_read_packet, | ||
| 91 | }; | ||
| 92 |