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ffmpeg/libavformat/alp.c

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/*
* LEGO Racers ALP (.tun & .pcm) (de)muxer
*
* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config_components.h"
#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "mux.h"
#include "rawenc.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#define ALP_TAG MKTAG('A', 'L', 'P', ' ')
#define ALP_MAX_READ_SIZE 4096
typedef struct ALPHeader {
uint32_t magic; /*< Magic Number, {'A', 'L', 'P', ' '} */
uint32_t header_size; /*< Header size (after this). */
char adpcm[6]; /*< "ADPCM" */
uint8_t unk1; /*< Unknown */
uint8_t num_channels; /*< Channel Count. */
uint32_t sample_rate; /*< Sample rate, only if header_size >= 12. */
} ALPHeader;
typedef enum ALPType {
ALP_TYPE_AUTO = 0, /*< Autodetect based on file extension. */
ALP_TYPE_TUN = 1, /*< Force a .TUN file. */
ALP_TYPE_PCM = 2, /*< Force a .PCM file. */
} ALPType;
typedef struct ALPMuxContext {
const AVClass *class;
ALPType type;
} ALPMuxContext;
#if CONFIG_ALP_DEMUXER
static int alp_probe(const AVProbeData *p)
{
uint32_t i;
if (AV_RL32(p->buf) != ALP_TAG)
return 0;
/* Only allowed header sizes are 8 and 12. */
i = AV_RL32(p->buf + 4);
if (i != 8 && i != 12)
return 0;
if (strncmp("ADPCM", p->buf + 8, 6) != 0)
return 0;
return AVPROBE_SCORE_MAX - 1;
}
static int alp_read_header(AVFormatContext *s)
{
int ret;
AVStream *st;
ALPHeader *hdr = s->priv_data;
AVCodecParameters *par;
if ((hdr->magic = avio_rl32(s->pb)) != ALP_TAG)
return AVERROR_INVALIDDATA;
hdr->header_size = avio_rl32(s->pb);
if (hdr->header_size != 8 && hdr->header_size != 12) {
return AVERROR_INVALIDDATA;
}
if ((ret = avio_read(s->pb, hdr->adpcm, sizeof(hdr->adpcm))) < 0)
return ret;
else if (ret != sizeof(hdr->adpcm))
return AVERROR(EIO);
if (strncmp("ADPCM", hdr->adpcm, sizeof(hdr->adpcm)) != 0)
return AVERROR_INVALIDDATA;
hdr->unk1 = avio_r8(s->pb);
hdr->num_channels = avio_r8(s->pb);
if (hdr->header_size == 8) {
/* .TUN music file */
hdr->sample_rate = 22050;
} else {
/* .PCM sound file */
hdr->sample_rate = avio_rl32(s->pb);
}
if (hdr->sample_rate > 44100) {
avpriv_request_sample(s, "Sample Rate > 44100");
return AVERROR_PATCHWELCOME;
}
if (!(st = avformat_new_stream(s, NULL)))
return AVERROR(ENOMEM);
par = st->codecpar;
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->codec_id = AV_CODEC_ID_ADPCM_IMA_ALP;
par->format = AV_SAMPLE_FMT_S16;
par->sample_rate = hdr->sample_rate;
if (hdr->num_channels > 2 || hdr->num_channels == 0)
return AVERROR_INVALIDDATA;
av_channel_layout_default(&par->ch_layout, hdr->num_channels);
par->bits_per_coded_sample = 4;
par->block_align = 1;
par->bit_rate = par->ch_layout.nb_channels *
par->sample_rate *
par->bits_per_coded_sample;
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
return 0;
}
static int alp_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret;
AVCodecParameters *par = s->streams[0]->codecpar;
if ((ret = av_get_packet(s->pb, pkt, ALP_MAX_READ_SIZE)) < 0)
return ret;
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
pkt->stream_index = 0;
pkt->duration = ret * 2 / par->ch_layout.nb_channels;
return 0;
}
static int alp_seek(AVFormatContext *s, int stream_index,
int64_t pts, int flags)
{
const ALPHeader *hdr = s->priv_data;
if (pts != 0)
return AVERROR(EINVAL);
return avio_seek(s->pb, hdr->header_size + 8, SEEK_SET);
}
const FFInputFormat ff_alp_demuxer = {
.p.name = "alp",
.p.long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
.priv_data_size = sizeof(ALPHeader),
.read_probe = alp_probe,
.read_header = alp_read_header,
.read_packet = alp_read_packet,
.read_seek = alp_seek,
};
#endif
#if CONFIG_ALP_MUXER
static int alp_write_init(AVFormatContext *s)
{
ALPMuxContext *alp = s->priv_data;
AVCodecParameters *par;
if (alp->type == ALP_TYPE_AUTO) {
if (av_match_ext(s->url, "pcm"))
alp->type = ALP_TYPE_PCM;
else
alp->type = ALP_TYPE_TUN;
}
par = s->streams[0]->codecpar;
if (par->ch_layout.nb_channels > 2) {
av_log(s, AV_LOG_ERROR, "A maximum of 2 channels are supported\n");
return AVERROR(EINVAL);
}
if (par->sample_rate > 44100) {
av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
return AVERROR(EINVAL);
}
if (alp->type == ALP_TYPE_TUN && par->sample_rate != 22050) {
av_log(s, AV_LOG_ERROR, "Sample rate must be 22050 for TUN files\n");
return AVERROR(EINVAL);
}
return 0;
}
static int alp_write_header(AVFormatContext *s)
{
ALPMuxContext *alp = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
avio_wl32(s->pb, ALP_TAG);
avio_wl32(s->pb, alp->type == ALP_TYPE_PCM ? 12 : 8);
avio_write(s->pb, "ADPCM", 6);
avio_w8(s->pb, 0);
avio_w8(s->pb, par->ch_layout.nb_channels);
if (alp->type == ALP_TYPE_PCM)
avio_wl32(s->pb, par->sample_rate);
return 0;
}
enum { AE = AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM };
static const AVOption alp_options[] = {
{
.name = "type",
.help = "set file type",
.offset = offsetof(ALPMuxContext, type),
.type = AV_OPT_TYPE_INT,
.default_val = {.i64 = ALP_TYPE_AUTO},
.min = ALP_TYPE_AUTO,
.max = ALP_TYPE_PCM,
.flags = AE,
.unit = "type",
},
{
.name = "auto",
.help = "autodetect based on file extension",
.offset = 0,
.type = AV_OPT_TYPE_CONST,
.default_val = {.i64 = ALP_TYPE_AUTO},
.min = 0,
.max = 0,
.flags = AE,
.unit = "type"
},
{
.name = "tun",
.help = "force .tun, used for music",
.offset = 0,
.type = AV_OPT_TYPE_CONST,
.default_val = {.i64 = ALP_TYPE_TUN},
.min = 0,
.max = 0,
.flags = AE,
.unit = "type"
},
{
.name = "pcm",
.help = "force .pcm, used for sfx",
.offset = 0,
.type = AV_OPT_TYPE_CONST,
.default_val = {.i64 = ALP_TYPE_PCM},
.min = 0,
.max = 0,
.flags = AE,
.unit = "type"
},
{ NULL }
};
static const AVClass alp_muxer_class = {
.class_name = "alp",
.item_name = av_default_item_name,
.option = alp_options,
.version = LIBAVUTIL_VERSION_INT
};
const FFOutputFormat ff_alp_muxer = {
.p.name = "alp",
.p.long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
.p.extensions = "tun,pcm",
.p.audio_codec = AV_CODEC_ID_ADPCM_IMA_ALP,
.p.video_codec = AV_CODEC_ID_NONE,
.p.subtitle_codec = AV_CODEC_ID_NONE,
.p.priv_class = &alp_muxer_class,
.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
.init = alp_write_init,
.write_header = alp_write_header,
.write_packet = ff_raw_write_packet,
.priv_data_size = sizeof(ALPMuxContext)
};
#endif
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