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108 lines
3.6 KiB
108 lines
3.6 KiB
/* |
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* MD STUDIO audio muxer |
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* |
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* Copyright (c) 2024 asivery |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "rawenc.h" |
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#include "mux.h" |
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static int aea_write_header(AVFormatContext *s) |
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{ |
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const AVDictionaryEntry *title_entry; |
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size_t title_length = 0; |
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AVStream *st = s->streams[0]; |
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if (st->codecpar->ch_layout.nb_channels != 1 && st->codecpar->ch_layout.nb_channels != 2) { |
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av_log(s, AV_LOG_ERROR, "Only maximum 2 channels are supported in the audio" |
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" stream, %d channels were found.\n", st->codecpar->ch_layout.nb_channels); |
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return AVERROR(EINVAL); |
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} |
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if (st->codecpar->sample_rate != 44100) { |
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av_log(s, AV_LOG_ERROR, "Invalid sample rate (%d) AEA only supports 44.1kHz.\n", st->codecpar->sample_rate); |
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return AVERROR(EINVAL); |
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} |
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/* Write magic */ |
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avio_wl32(s->pb, 2048); |
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/* Write AEA title */ |
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title_entry = av_dict_get(st->metadata, "title", NULL, 0); |
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if (title_entry) { |
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const char *title_contents = title_entry->value; |
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title_length = strlen(title_contents); |
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if (title_length > 256) { |
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av_log(s, AV_LOG_WARNING, "Title too long, truncated to 256 bytes.\n"); |
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title_length = 256; |
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} |
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avio_write(s->pb, title_contents, title_length); |
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} |
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ffio_fill(s->pb, 0, 256 - title_length); |
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/* Write number of frames (zero at header-writing time, will seek later), number of channels */ |
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avio_wl32(s->pb, 0); |
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avio_w8(s->pb, st->codecpar->ch_layout.nb_channels); |
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avio_w8(s->pb, 0); |
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/* Pad the header to 2048 bytes */ |
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ffio_fill(s->pb, 0, 1782); |
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return 0; |
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} |
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static int aea_write_trailer(struct AVFormatContext *s) |
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{ |
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int64_t total_blocks; |
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AVIOContext *pb = s->pb; |
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AVStream *st = s->streams[0]; |
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if (pb->seekable & AVIO_SEEKABLE_NORMAL) { |
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/* Seek to rewrite the block count. */ |
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avio_seek(pb, 260, SEEK_SET); |
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total_blocks = st->nb_frames * st->codecpar->ch_layout.nb_channels; |
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if (total_blocks > UINT32_MAX) { |
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av_log(s, AV_LOG_WARNING, "Too many frames in the file to properly encode the header (%"PRId64")." |
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" Block count in the header will be truncated.\n", total_blocks); |
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total_blocks = UINT32_MAX; |
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} |
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avio_wl32(pb, total_blocks); |
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} else { |
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av_log(s, AV_LOG_WARNING, "Unable to rewrite AEA header.\n"); |
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} |
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return 0; |
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} |
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const FFOutputFormat ff_aea_muxer = { |
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.p.name = "aea", |
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.p.long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"), |
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.p.extensions = "aea", |
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.p.audio_codec = AV_CODEC_ID_ATRAC1, |
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.p.video_codec = AV_CODEC_ID_NONE, |
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.p.subtitle_codec = AV_CODEC_ID_NONE, |
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.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | |
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FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, |
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.write_header = aea_write_header, |
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.write_packet = ff_raw_write_packet, |
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.write_trailer = aea_write_trailer, |
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};
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