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authorZane van Iperen <zane@zanevaniperen.com>2020-10-21 16:20:20 +0300
committerZane van Iperen <zane@zanevaniperen.com>2020-10-25 16:44:26 +0300
commit7a11cc29d6e798c1a068d799867ba1004f896dfa (patch)
tree0bd106386ba3b76c5cea2022f2ccdc975e8e63eb /libavformat/alp.c
parent40a8d438850dcc31a89762a8f13b5073f4369ceb (diff)
avformat: add alp muxer
Diffstat (limited to 'libavformat/alp.c')
-rw-r--r--libavformat/alp.c148
1 files changed, 147 insertions, 1 deletions
diff --git a/libavformat/alp.c b/libavformat/alp.c
index e1da312b8c..f2b0c37730 100644
--- a/libavformat/alp.c
+++ b/libavformat/alp.c
@@ -1,5 +1,5 @@
/*
- * LEGO Racers ALP (.tun & .pcm) demuxer
+ * LEGO Racers ALP (.tun & .pcm) (de)muxer
*
* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
*
@@ -21,8 +21,10 @@
*/
#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
@@ -36,6 +38,18 @@ typedef struct ALPHeader {
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;
@@ -144,3 +158,135 @@ AVInputFormat ff_alp_demuxer = {
.read_header = alp_read_header,
.read_packet = alp_read_packet
};
+#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
+};
+
+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