/*
- * LEGO Racers ALP (.tun & .pcm) demuxer
+ * LEGO Racers ALP (.tun & .pcm) (de)muxer
*
* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
*
*/
#include "avformat.h"
#include "internal.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
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 (strncmp("ADPCM", p->buf + 8, 6) != 0)
return 0;
- return AVPROBE_SCORE_EXTENSION + 1;
+ return AVPROBE_SCORE_MAX - 1;
}
static int alp_read_header(AVFormatContext *s)
{
int ret;
AVStream *st;
- ALPHeader hdr;
+ ALPHeader *hdr = s->priv_data;
AVCodecParameters *par;
- if ((hdr.magic = avio_rl32(s->pb)) != ALP_TAG)
+ if ((hdr->magic = avio_rl32(s->pb)) != ALP_TAG)
return AVERROR_INVALIDDATA;
- hdr.header_size = avio_rl32(s->pb);
+ hdr->header_size = avio_rl32(s->pb);
- if (hdr.header_size != 8 && hdr.header_size != 12) {
+ if (hdr->header_size != 8 && hdr->header_size != 12) {
return AVERROR_INVALIDDATA;
}
- if ((ret = avio_read(s->pb, hdr.adpcm, sizeof(hdr.adpcm))) < 0)
+ if ((ret = avio_read(s->pb, hdr->adpcm, sizeof(hdr->adpcm))) < 0)
return ret;
- else if (ret != sizeof(hdr.adpcm))
+ else if (ret != sizeof(hdr->adpcm))
return AVERROR(EIO);
- if (strncmp("ADPCM", hdr.adpcm, sizeof(hdr.adpcm)) != 0)
+ 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);
+ hdr->unk1 = avio_r8(s->pb);
+ hdr->num_channels = avio_r8(s->pb);
- if (hdr.header_size == 8) {
+ if (hdr->header_size == 8) {
/* .TUN music file */
- hdr.sample_rate = 11025 * hdr.num_channels;
+ hdr->sample_rate = 22050;
+
} else {
/* .PCM sound file */
- hdr.sample_rate = avio_rl32(s->pb);
+ hdr->sample_rate = avio_rl32(s->pb);
}
- if (hdr.sample_rate > 44100) {
+ if (hdr->sample_rate > 44100) {
avpriv_request_sample(s, "Sample Rate > 44100");
return AVERROR_PATCHWELCOME;
}
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;
- par->channels = hdr.num_channels;
+ par->sample_rate = hdr->sample_rate;
+ par->channels = hdr->num_channels;
- if (hdr.num_channels == 1)
+ if (hdr->num_channels == 1)
par->channel_layout = AV_CH_LAYOUT_MONO;
- else if (hdr.num_channels == 2)
+ else if (hdr->num_channels == 2)
par->channel_layout = AV_CH_LAYOUT_STEREO;
else
return AVERROR_INVALIDDATA;
return 0;
}
-AVInputFormat ff_alp_demuxer = {
+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 AVInputFormat ff_alp_demuxer = {
.name = "alp",
.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_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;
+ }
+
+ if (s->nb_streams != 1) {
+ av_log(s, AV_LOG_ERROR, "Too many streams\n");
+ return AVERROR(EINVAL);
+ }
+
+ par = s->streams[0]->codecpar;
+
+ if (par->codec_id != AV_CODEC_ID_ADPCM_IMA_ALP) {
+ av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
+ avcodec_get_name(par->codec_id));
+ return AVERROR(EINVAL);
+ }
+
+ if (par->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->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 AVOutputFormat ff_alp_muxer = {
+ .name = "alp",
+ .long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
+ .extensions = "tun,pcm",
+ .audio_codec = AV_CODEC_ID_ADPCM_IMA_ALP,
+ .video_codec = AV_CODEC_ID_NONE,
+ .init = alp_write_init,
+ .write_header = alp_write_header,
+ .write_packet = ff_raw_write_packet,
+ .priv_class = &alp_muxer_class,
+ .priv_data_size = sizeof(ALPMuxContext)
};
+#endif
projects / ffmpeg / blobdiff