| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MD STUDIO audio muxer | ||
| 3 | * | ||
| 4 | * Copyright (c) 2024 asivery | ||
| 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 "avformat.h" | ||
| 24 | #include "avio_internal.h" | ||
| 25 | #include "rawenc.h" | ||
| 26 | #include "mux.h" | ||
| 27 | |||
| 28 | 1 | static int aea_write_header(AVFormatContext *s) | |
| 29 | { | ||
| 30 | const AVDictionaryEntry *title_entry; | ||
| 31 | 1 | size_t title_length = 0; | |
| 32 | 1 | AVStream *st = s->streams[0]; | |
| 33 | |||
| 34 |
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1 | if (st->codecpar->ch_layout.nb_channels != 1 && st->codecpar->ch_layout.nb_channels != 2) { |
| 35 | ✗ | av_log(s, AV_LOG_ERROR, "Only maximum 2 channels are supported in the audio" | |
| 36 | ✗ | " stream, %d channels were found.\n", st->codecpar->ch_layout.nb_channels); | |
| 37 | ✗ | return AVERROR(EINVAL); | |
| 38 | } | ||
| 39 | |||
| 40 |
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1 | if (st->codecpar->sample_rate != 44100) { |
| 41 | ✗ | av_log(s, AV_LOG_ERROR, "Invalid sample rate (%d) AEA only supports 44.1kHz.\n", st->codecpar->sample_rate); | |
| 42 | ✗ | return AVERROR(EINVAL); | |
| 43 | } | ||
| 44 | |||
| 45 | /* Write magic */ | ||
| 46 | 1 | avio_wl32(s->pb, 2048); | |
| 47 | |||
| 48 | /* Write AEA title */ | ||
| 49 | 1 | title_entry = av_dict_get(st->metadata, "title", NULL, 0); | |
| 50 |
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1 | if (title_entry) { |
| 51 | 1 | const char *title_contents = title_entry->value; | |
| 52 | 1 | title_length = strlen(title_contents); | |
| 53 |
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1 | if (title_length > 256) { |
| 54 | ✗ | av_log(s, AV_LOG_WARNING, "Title too long, truncated to 256 bytes.\n"); | |
| 55 | ✗ | title_length = 256; | |
| 56 | } | ||
| 57 | 1 | avio_write(s->pb, title_contents, title_length); | |
| 58 | } | ||
| 59 | |||
| 60 | 1 | ffio_fill(s->pb, 0, 256 - title_length); | |
| 61 | |||
| 62 | /* Write number of frames (zero at header-writing time, will seek later), number of channels */ | ||
| 63 | 1 | avio_wl32(s->pb, 0); | |
| 64 | 1 | avio_w8(s->pb, st->codecpar->ch_layout.nb_channels); | |
| 65 | 1 | avio_w8(s->pb, 0); | |
| 66 | |||
| 67 | /* Pad the header to 2048 bytes */ | ||
| 68 | 1 | ffio_fill(s->pb, 0, 1782); | |
| 69 | |||
| 70 | 1 | return 0; | |
| 71 | } | ||
| 72 | |||
| 73 | 1 | static int aea_write_trailer(struct AVFormatContext *s) | |
| 74 | { | ||
| 75 | int64_t total_blocks; | ||
| 76 | 1 | AVIOContext *pb = s->pb; | |
| 77 | 1 | AVStream *st = s->streams[0]; | |
| 78 |
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1 | if (pb->seekable & AVIO_SEEKABLE_NORMAL) { |
| 79 | /* Seek to rewrite the block count. */ | ||
| 80 | 1 | avio_seek(pb, 260, SEEK_SET); | |
| 81 | 1 | total_blocks = st->nb_frames * st->codecpar->ch_layout.nb_channels; | |
| 82 |
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1 | if (total_blocks > UINT32_MAX) { |
| 83 | ✗ | av_log(s, AV_LOG_WARNING, "Too many frames in the file to properly encode the header (%"PRId64")." | |
| 84 | " Block count in the header will be truncated.\n", total_blocks); | ||
| 85 | ✗ | total_blocks = UINT32_MAX; | |
| 86 | } | ||
| 87 | 1 | avio_wl32(pb, total_blocks); | |
| 88 | } else { | ||
| 89 | ✗ | av_log(s, AV_LOG_WARNING, "Unable to rewrite AEA header.\n"); | |
| 90 | } | ||
| 91 | |||
| 92 | 1 | return 0; | |
| 93 | } | ||
| 94 | |||
| 95 | const FFOutputFormat ff_aea_muxer = { | ||
| 96 | .p.name = "aea", | ||
| 97 | .p.long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"), | ||
| 98 | .p.extensions = "aea", | ||
| 99 | .p.audio_codec = AV_CODEC_ID_ATRAC1, | ||
| 100 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 101 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 102 | |||
| 103 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 104 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 105 | .write_header = aea_write_header, | ||
| 106 | .write_packet = ff_raw_write_packet, | ||
| 107 | .write_trailer = aea_write_trailer, | ||
| 108 | }; | ||
| 109 |