| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MD STUDIO audio demuxer | ||
| 3 | * | ||
| 4 | * Copyright (c) 2009 Benjamin Larsson | ||
| 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 "libavutil/channel_layout.h" | ||
| 24 | #include "libavutil/intreadwrite.h" | ||
| 25 | #include "avformat.h" | ||
| 26 | #include "avio_internal.h" | ||
| 27 | #include "demux.h" | ||
| 28 | #include "internal.h" | ||
| 29 | #include "pcm.h" | ||
| 30 | |||
| 31 | #define AT1_SU_SIZE 212 | ||
| 32 | |||
| 33 | 7128 | static int aea_read_probe(const AVProbeData *p) | |
| 34 | { | ||
| 35 |
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7128 | if (p->buf_size <= 2048+AT1_SU_SIZE) |
| 36 | 3940 | return 0; | |
| 37 | |||
| 38 | /* Magic is '00 08 00 00' in little-endian*/ | ||
| 39 |
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3188 | if (AV_RL32(p->buf)==0x800) { |
| 40 | 4 | int ch, block_size, score = 0; | |
| 41 | 4 | ch = p->buf[264]; | |
| 42 | |||
| 43 |
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4 | if (ch != 1 && ch != 2) |
| 44 | ✗ | return 0; | |
| 45 | |||
| 46 | 4 | block_size = ch * AT1_SU_SIZE; | |
| 47 | /* Check so that the redundant bsm bytes and info bytes are valid | ||
| 48 | * the block size mode bytes have to be the same | ||
| 49 | * the info bytes have to be the same | ||
| 50 | */ | ||
| 51 |
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16 | for (int i = 2048 + block_size; i + block_size <= p->buf_size; i += block_size) { |
| 52 |
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12 | if (AV_RN16(p->buf+i) != AV_RN16(p->buf+i+AT1_SU_SIZE)) |
| 53 | ✗ | return 0; | |
| 54 | 12 | score++; | |
| 55 | } | ||
| 56 | 4 | return FFMIN(AVPROBE_SCORE_MAX / 4 + score, AVPROBE_SCORE_MAX); | |
| 57 | } | ||
| 58 | 3184 | return 0; | |
| 59 | } | ||
| 60 | |||
| 61 | 6 | static int aea_read_header(AVFormatContext *s) | |
| 62 | { | ||
| 63 | 6 | AVStream *st = avformat_new_stream(s, NULL); | |
| 64 | char title[256 + 1]; | ||
| 65 | int channels, ret; | ||
| 66 |
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6 | if (!st) |
| 67 | ✗ | return AVERROR(ENOMEM); | |
| 68 | |||
| 69 | /* Read the title, parse the number of channels and skip to pos 2048(0x800) */ | ||
| 70 | 6 | avio_rl32(s->pb); // magic | |
| 71 | 6 | ret = ffio_read_size(s->pb, title, sizeof(title) - 1); | |
| 72 |
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6 | if (ret < 0) |
| 73 | ✗ | return ret; | |
| 74 | 6 | title[sizeof(title) - 1] = '\0'; | |
| 75 |
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6 | if (title[0] != '\0') |
| 76 | 6 | av_dict_set(&st->metadata, "title", title, 0); | |
| 77 | 6 | avio_rl32(s->pb); // Block count | |
| 78 | 6 | channels = avio_r8(s->pb); | |
| 79 | 6 | avio_skip(s->pb, 1783); | |
| 80 | |||
| 81 | |||
| 82 | 6 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 83 | 6 | st->codecpar->codec_id = AV_CODEC_ID_ATRAC1; | |
| 84 | 6 | st->codecpar->sample_rate = 44100; | |
| 85 | 6 | st->codecpar->bit_rate = 146000 * channels; | |
| 86 | |||
| 87 |
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6 | if (channels != 1 && channels != 2) { |
| 88 | ✗ | av_log(s, AV_LOG_ERROR, "Channels %d not supported!\n", channels); | |
| 89 | ✗ | return AVERROR_INVALIDDATA; | |
| 90 | } | ||
| 91 | |||
| 92 | 6 | av_channel_layout_default(&st->codecpar->ch_layout, channels); | |
| 93 | |||
| 94 | 6 | st->codecpar->block_align = AT1_SU_SIZE * st->codecpar->ch_layout.nb_channels; | |
| 95 | 6 | avpriv_set_pts_info(st, 64, 1, 44100); | |
| 96 | 6 | return 0; | |
| 97 | } | ||
| 98 | |||
| 99 | 3608 | static int aea_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 100 | { | ||
| 101 | 3608 | return av_get_packet(s->pb, pkt, s->streams[0]->codecpar->block_align); | |
| 102 | } | ||
| 103 | |||
| 104 | const FFInputFormat ff_aea_demuxer = { | ||
| 105 | .p.name = "aea", | ||
| 106 | .p.long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"), | ||
| 107 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 108 | .p.extensions = "aea", | ||
| 109 | .read_probe = aea_read_probe, | ||
| 110 | .read_header = aea_read_header, | ||
| 111 | .read_packet = aea_read_packet, | ||
| 112 | .read_seek = ff_pcm_read_seek, | ||
| 113 | }; | ||
| 114 |