mirror of https://git.videolan.org/git/ffmpeg.git
109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/*
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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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