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avformat/aea: add aea muxer
Signed-off-by: asivery <asivery@protonmail.com>
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@ -32,6 +32,7 @@ version <next>:
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- DVD-Video demuxer, powered by libdvdnav and libdvdread
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- ffprobe -show_stream_groups option
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- ffprobe (with -export_side_data film_grain) now prints film grain metadata
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- AEA muxer
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version 6.1:
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@ -684,6 +684,16 @@ Enable to set MPEG version bit in the ADTS frame header to 1 which
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indicates MPEG-2. Default is 0, which indicates MPEG-4.
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@end table
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@anchor{aea}
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@section aea
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MD STUDIO audio muxer.
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This muxer accepts a single ATRAC1 audio stream with either one or two channels
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and a sample rate of 44100Hz.
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As AEA supports storing the track title, this muxer will also write
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the title from stream's metadata to the container.
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@anchor{aiff}
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@section aiff
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Audio Interchange File Format muxer.
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@ -91,7 +91,8 @@ OBJS-$(CONFIG_ADTS_MUXER) += adtsenc.o apetag.o img2.o \
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id3v2enc.o
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OBJS-$(CONFIG_ADX_DEMUXER) += adxdec.o
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OBJS-$(CONFIG_ADX_MUXER) += rawenc.o
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OBJS-$(CONFIG_AEA_DEMUXER) += aea.o pcm.o
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OBJS-$(CONFIG_AEA_DEMUXER) += aeadec.o pcm.o
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OBJS-$(CONFIG_AEA_MUXER) += aeaenc.o rawenc.o
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OBJS-$(CONFIG_AFC_DEMUXER) += afc.o
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OBJS-$(CONFIG_AIFF_DEMUXER) += aiffdec.o aiff.o pcm.o \
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mov_chan.o replaygain.o
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115
libavformat/aeaenc.c
Normal file
115
libavformat/aeaenc.c
Normal file
@ -0,0 +1,115 @@
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/*
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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;
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if (s->nb_streams > 1) {
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av_log(s, AV_LOG_ERROR, "Got more than one stream to encode. This is not supported.\n");
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return AVERROR(EINVAL);
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}
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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->codec_id != AV_CODEC_ID_ATRAC1) {
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av_log(s, AV_LOG_ERROR, "AEA can only store ATRAC1 streams, %s was found.\n", avcodec_get_name(st->codecpar->codec_id));
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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 (%ld)."
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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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.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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@ -47,6 +47,7 @@ extern const FFOutputFormat ff_adts_muxer;
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extern const FFInputFormat ff_adx_demuxer;
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extern const FFOutputFormat ff_adx_muxer;
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extern const FFInputFormat ff_aea_demuxer;
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extern const FFOutputFormat ff_aea_muxer;
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extern const FFInputFormat ff_afc_demuxer;
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extern const FFInputFormat ff_aiff_demuxer;
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extern const FFOutputFormat ff_aiff_muxer;
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