308 lines
8.7 KiB
C
308 lines
8.7 KiB
C
/*
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* LEGO Racers ALP (.tun & .pcm) (de)muxer
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*
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* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
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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 "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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#include "rawenc.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#define ALP_TAG MKTAG('A', 'L', 'P', ' ')
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#define ALP_MAX_READ_SIZE 4096
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typedef struct ALPHeader {
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uint32_t magic; /*< Magic Number, {'A', 'L', 'P', ' '} */
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uint32_t header_size; /*< Header size (after this). */
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char adpcm[6]; /*< "ADPCM" */
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uint8_t unk1; /*< Unknown */
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uint8_t num_channels; /*< Channel Count. */
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uint32_t sample_rate; /*< Sample rate, only if header_size >= 12. */
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} ALPHeader;
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typedef enum ALPType {
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ALP_TYPE_AUTO = 0, /*< Autodetect based on file extension. */
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ALP_TYPE_TUN = 1, /*< Force a .TUN file. */
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ALP_TYPE_PCM = 2, /*< Force a .PCM file. */
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} ALPType;
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typedef struct ALPMuxContext {
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const AVClass *class;
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ALPType type;
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} ALPMuxContext;
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#if CONFIG_ALP_DEMUXER
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static int alp_probe(const AVProbeData *p)
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{
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uint32_t i;
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if (AV_RL32(p->buf) != ALP_TAG)
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return 0;
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/* Only allowed header sizes are 8 and 12. */
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i = AV_RL32(p->buf + 4);
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if (i != 8 && i != 12)
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return 0;
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if (strncmp("ADPCM", p->buf + 8, 6) != 0)
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return 0;
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return AVPROBE_SCORE_MAX - 1;
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}
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static int alp_read_header(AVFormatContext *s)
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{
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int ret;
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AVStream *st;
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ALPHeader *hdr = s->priv_data;
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AVCodecParameters *par;
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if ((hdr->magic = avio_rl32(s->pb)) != ALP_TAG)
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return AVERROR_INVALIDDATA;
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hdr->header_size = avio_rl32(s->pb);
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if (hdr->header_size != 8 && hdr->header_size != 12) {
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return AVERROR_INVALIDDATA;
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}
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if ((ret = avio_read(s->pb, hdr->adpcm, sizeof(hdr->adpcm))) < 0)
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return ret;
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else if (ret != sizeof(hdr->adpcm))
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return AVERROR(EIO);
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if (strncmp("ADPCM", hdr->adpcm, sizeof(hdr->adpcm)) != 0)
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return AVERROR_INVALIDDATA;
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hdr->unk1 = avio_r8(s->pb);
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hdr->num_channels = avio_r8(s->pb);
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if (hdr->header_size == 8) {
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/* .TUN music file */
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hdr->sample_rate = 22050;
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} else {
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/* .PCM sound file */
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hdr->sample_rate = avio_rl32(s->pb);
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}
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if (hdr->sample_rate > 44100) {
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avpriv_request_sample(s, "Sample Rate > 44100");
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return AVERROR_PATCHWELCOME;
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}
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if (!(st = avformat_new_stream(s, NULL)))
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return AVERROR(ENOMEM);
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par = st->codecpar;
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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par->codec_id = AV_CODEC_ID_ADPCM_IMA_ALP;
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par->format = AV_SAMPLE_FMT_S16;
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par->sample_rate = hdr->sample_rate;
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par->channels = hdr->num_channels;
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if (hdr->num_channels == 1)
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par->channel_layout = AV_CH_LAYOUT_MONO;
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else if (hdr->num_channels == 2)
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par->channel_layout = AV_CH_LAYOUT_STEREO;
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else
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return AVERROR_INVALIDDATA;
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par->bits_per_coded_sample = 4;
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par->block_align = 1;
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par->bit_rate = par->channels *
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par->sample_rate *
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par->bits_per_coded_sample;
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avpriv_set_pts_info(st, 64, 1, par->sample_rate);
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return 0;
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}
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static int alp_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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AVCodecParameters *par = s->streams[0]->codecpar;
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if ((ret = av_get_packet(s->pb, pkt, ALP_MAX_READ_SIZE)) < 0)
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return ret;
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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pkt->stream_index = 0;
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pkt->duration = ret * 2 / par->channels;
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return 0;
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}
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static int alp_seek(AVFormatContext *s, int stream_index,
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int64_t pts, int flags)
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{
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const ALPHeader *hdr = s->priv_data;
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if (pts != 0)
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return AVERROR(EINVAL);
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return avio_seek(s->pb, hdr->header_size + 8, SEEK_SET);
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}
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const AVInputFormat ff_alp_demuxer = {
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.name = "alp",
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.long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
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.priv_data_size = sizeof(ALPHeader),
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.read_probe = alp_probe,
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.read_header = alp_read_header,
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.read_packet = alp_read_packet,
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.read_seek = alp_seek,
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};
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#endif
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#if CONFIG_ALP_MUXER
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static int alp_write_init(AVFormatContext *s)
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{
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ALPMuxContext *alp = s->priv_data;
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AVCodecParameters *par;
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if (alp->type == ALP_TYPE_AUTO) {
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if (av_match_ext(s->url, "pcm"))
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alp->type = ALP_TYPE_PCM;
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else
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alp->type = ALP_TYPE_TUN;
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}
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if (s->nb_streams != 1) {
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av_log(s, AV_LOG_ERROR, "Too many streams\n");
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return AVERROR(EINVAL);
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}
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par = s->streams[0]->codecpar;
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if (par->codec_id != AV_CODEC_ID_ADPCM_IMA_ALP) {
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av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
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avcodec_get_name(par->codec_id));
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return AVERROR(EINVAL);
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}
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if (par->channels > 2) {
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av_log(s, AV_LOG_ERROR, "A maximum of 2 channels are supported\n");
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return AVERROR(EINVAL);
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}
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if (par->sample_rate > 44100) {
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av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
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return AVERROR(EINVAL);
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}
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if (alp->type == ALP_TYPE_TUN && par->sample_rate != 22050) {
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av_log(s, AV_LOG_ERROR, "Sample rate must be 22050 for TUN files\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int alp_write_header(AVFormatContext *s)
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{
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ALPMuxContext *alp = s->priv_data;
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AVCodecParameters *par = s->streams[0]->codecpar;
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avio_wl32(s->pb, ALP_TAG);
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avio_wl32(s->pb, alp->type == ALP_TYPE_PCM ? 12 : 8);
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avio_write(s->pb, "ADPCM", 6);
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avio_w8(s->pb, 0);
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avio_w8(s->pb, par->channels);
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if (alp->type == ALP_TYPE_PCM)
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avio_wl32(s->pb, par->sample_rate);
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return 0;
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}
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enum { AE = AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM };
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static const AVOption alp_options[] = {
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{
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.name = "type",
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.help = "set file type",
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.offset = offsetof(ALPMuxContext, type),
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.type = AV_OPT_TYPE_INT,
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.default_val = {.i64 = ALP_TYPE_AUTO},
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.min = ALP_TYPE_AUTO,
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.max = ALP_TYPE_PCM,
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.flags = AE,
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.unit = "type",
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},
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{
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.name = "auto",
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.help = "autodetect based on file extension",
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.offset = 0,
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.type = AV_OPT_TYPE_CONST,
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.default_val = {.i64 = ALP_TYPE_AUTO},
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.min = 0,
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.max = 0,
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.flags = AE,
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.unit = "type"
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},
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{
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.name = "tun",
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.help = "force .tun, used for music",
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.offset = 0,
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.type = AV_OPT_TYPE_CONST,
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.default_val = {.i64 = ALP_TYPE_TUN},
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.min = 0,
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.max = 0,
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.flags = AE,
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.unit = "type"
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},
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{
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.name = "pcm",
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.help = "force .pcm, used for sfx",
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.offset = 0,
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.type = AV_OPT_TYPE_CONST,
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.default_val = {.i64 = ALP_TYPE_PCM},
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.min = 0,
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.max = 0,
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.flags = AE,
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.unit = "type"
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},
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{ NULL }
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};
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static const AVClass alp_muxer_class = {
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.class_name = "alp",
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.item_name = av_default_item_name,
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.option = alp_options,
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.version = LIBAVUTIL_VERSION_INT
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};
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const AVOutputFormat ff_alp_muxer = {
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.name = "alp",
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.long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
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.extensions = "tun,pcm",
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.audio_codec = AV_CODEC_ID_ADPCM_IMA_ALP,
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.video_codec = AV_CODEC_ID_NONE,
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.init = alp_write_init,
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.write_header = alp_write_header,
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.write_packet = ff_raw_write_packet,
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.priv_class = &alp_muxer_class,
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.priv_data_size = sizeof(ALPMuxContext)
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};
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#endif
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