147 lines
4.4 KiB
C
147 lines
4.4 KiB
C
/*
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* LEGO Racers ALP (.tun & .pcm) demuxer
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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 "avformat.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/internal.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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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;
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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 = 11025 * hdr.num_channels;
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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->bits_per_raw_sample = 16;
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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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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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.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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};
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