blob: 08dd9282fa4a6f9be12ee2b32f4707ef1a794ff1
| 1 | /* |
| 2 | * ACM demuxer |
| 3 | * Copyright (c) 2015 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 "rawdec.h" |
| 25 | #include "internal.h" |
| 26 | |
| 27 | static int acm_probe(AVProbeData *p) |
| 28 | { |
| 29 | if (AV_RB32(p->buf) != 0x97280301) |
| 30 | return 0; |
| 31 | |
| 32 | return AVPROBE_SCORE_MAX / 3 * 2; |
| 33 | } |
| 34 | |
| 35 | static int acm_read_header(AVFormatContext *s) |
| 36 | { |
| 37 | AVStream *st; |
| 38 | int ret; |
| 39 | |
| 40 | st = avformat_new_stream(s, NULL); |
| 41 | if (!st) |
| 42 | return AVERROR(ENOMEM); |
| 43 | |
| 44 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| 45 | st->codecpar->codec_id = AV_CODEC_ID_INTERPLAY_ACM; |
| 46 | |
| 47 | ff_alloc_extradata(st->codecpar, 14); |
| 48 | if (!st->codecpar->extradata) |
| 49 | return AVERROR(ENOMEM); |
| 50 | ret = avio_read(s->pb, st->codecpar->extradata, 14); |
| 51 | if (ret < 10) |
| 52 | return ret < 0 ? ret : AVERROR_EOF; |
| 53 | |
| 54 | st->codecpar->channels = AV_RL16(st->codecpar->extradata + 8); |
| 55 | st->codecpar->sample_rate = AV_RL16(st->codecpar->extradata + 10); |
| 56 | if (st->codecpar->channels <= 0 || st->codecpar->sample_rate <= 0) |
| 57 | return AVERROR_INVALIDDATA; |
| 58 | st->start_time = 0; |
| 59 | st->duration = AV_RL32(st->codecpar->extradata + 4) / st->codecpar->channels; |
| 60 | st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
| 61 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | AVInputFormat ff_acm_demuxer = { |
| 67 | .name = "acm", |
| 68 | .long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"), |
| 69 | .read_probe = acm_probe, |
| 70 | .read_header = acm_read_header, |
| 71 | .read_packet = ff_raw_read_partial_packet, |
| 72 | .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, |
| 73 | .extensions = "acm", |
| 74 | .raw_codec_id = AV_CODEC_ID_INTERPLAY_ACM, |
| 75 | }; |
| 76 |