Hi,
See attached.
From 3c26a0554397d623ab61671beaf2879d61911024 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <one...@gmail.com>
Date: Sat, 24 Oct 2015 20:41:32 +0200
Subject: [PATCH] avcodec: add SDX2 DPCM decoder
Signed-off-by: Paul B Mahol <one...@gmail.com>
---
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 2 ++
libavcodec/codec_desc.c | 7 +++++++
libavcodec/dpcm.c | 32 ++++++++++++++++++++++++++++----
libavformat/aiff.h | 1 +
libavformat/aiffdec.c | 1 +
libavformat/genh.c | 4 ++++
8 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index f85fc18..4afb473 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -458,6 +458,7 @@ OBJS-$(CONFIG_S302M_DECODER) += s302m.o
OBJS-$(CONFIG_S302M_ENCODER) += s302menc.o
OBJS-$(CONFIG_SANM_DECODER) += sanm.o
OBJS-$(CONFIG_SCREENPRESSO_DECODER) += screenpresso.o
+OBJS-$(CONFIG_SDX2_DPCM_DECODER) += dpcm.o
OBJS-$(CONFIG_SGI_DECODER) += sgidec.o
OBJS-$(CONFIG_SGI_ENCODER) += sgienc.o rle.o
OBJS-$(CONFIG_SGIRLE_DECODER) += sgirledec.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 7279620..52606a3 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -287,6 +287,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (S302M, s302m);
REGISTER_DECODER(SANM, sanm);
REGISTER_DECODER(SCREENPRESSO, screenpresso);
+ REGISTER_DECODER(SDX2_DPCM, sdx2_dpcm);
REGISTER_ENCDEC (SGI, sgi);
REGISTER_DECODER(SGIRLE, sgirle);
REGISTER_DECODER(SMACKER, smacker);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7d47698..490bcd2 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -410,6 +410,8 @@ enum AVCodecID {
AV_CODEC_ID_XAN_DPCM,
AV_CODEC_ID_SOL_DPCM,
+ AV_CODEC_ID_SDX2_DPCM = 0x14800,
+
/* audio codecs */
AV_CODEC_ID_MP2 = 0x15000,
AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 2f5cefd..61a9986 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -2054,6 +2054,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("DPCM Sol"),
.props = AV_CODEC_PROP_LOSSY,
},
+ {
+ .id = AV_CODEC_ID_SDX2_DPCM,
+ .type = AVMEDIA_TYPE_AUDIO,
+ .name = "sdx2_dpcm",
+ .long_name = NULL_IF_CONFIG_SMALL("DPCM SDX2"),
+ .props = AV_CODEC_PROP_LOSSY,
+ },
/* audio codecs */
{
diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c
index c13945e..0770e19 100644
--- a/libavcodec/dpcm.c
+++ b/libavcodec/dpcm.c
@@ -44,7 +44,7 @@
#include "mathops.h"
typedef struct DPCMContext {
- int16_t roq_square_array[256];
+ int16_t square_array[256];
int sample[2]; ///< previous sample (for SOL_DPCM)
const int8_t *sol_table; ///< delta table for SOL_DPCM
} DPCMContext;
@@ -130,8 +130,8 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx)
/* initialize square table */
for (i = 0; i < 128; i++) {
int16_t square = i * i;
- s->roq_square_array[i ] = square;
- s->roq_square_array[i + 128] = -square;
+ s->square_array[i ] = square;
+ s->square_array[i + 128] = -square;
}
break;
@@ -153,6 +153,13 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx)
}
break;
+ case AV_CODEC_ID_SDX2_DPCM:
+ for (i = -128; i < 128; i++) {
+ int16_t square = i * i * 2;
+ s->square_array[i+128] = i < 0 ? -square: square;
+ }
+ break;
+
default:
break;
}
@@ -200,6 +207,9 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
else
out = buf_size;
break;
+ case AV_CODEC_ID_SDX2_DPCM:
+ out = buf_size;
+ break;
}
if (out <= 0) {
av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
@@ -230,7 +240,7 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
/* decode the samples */
while (output_samples < samples_end) {
- predictor[ch] += s->roq_square_array[bytestream2_get_byteu(&gb)];
+ predictor[ch] += s->square_array[bytestream2_get_byteu(&gb)];
predictor[ch] = av_clip_int16(predictor[ch]);
*output_samples++ = predictor[ch];
@@ -318,6 +328,19 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
}
}
break;
+
+ case AV_CODEC_ID_SDX2_DPCM:
+ while (output_samples < samples_end) {
+ int8_t n = bytestream2_get_byteu(&gb);
+
+ if (!(n & 1))
+ s->sample[ch] = 0;
+ s->sample[ch] += s->square_array[n + 128];
+ s->sample[ch] = av_clip_int16(s->sample[ch]);
+ *output_samples++ = s->sample[ch];
+ ch ^= stereo;
+ }
+ break;
}
*got_frame_ptr = 1;
@@ -338,6 +361,7 @@ AVCodec ff_ ## name_ ## _decoder = { \
}
DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay");
+DPCM_DECODER(AV_CODEC_ID_SDX2_DPCM, sdx2_dpcm, "DPCM SDX2");
DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ");
DPCM_DECODER(AV_CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol");
DPCM_DECODER(AV_CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan");
diff --git a/libavformat/aiff.h b/libavformat/aiff.h
index 4470254..392f326 100644
--- a/libavformat/aiff.h
+++ b/libavformat/aiff.h
@@ -52,6 +52,7 @@ static const AVCodecTag ff_codec_aiff_tags[] = {
{ AV_CODEC_ID_ADPCM_IMA_QT, MKTAG('i','m','a','4') },
{ AV_CODEC_ID_QDM2, MKTAG('Q','D','M','2') },
{ AV_CODEC_ID_QCELP, MKTAG('Q','c','l','p') },
+ { AV_CODEC_ID_SDX2_DPCM, MKTAG('S','D','X','2') },
{ AV_CODEC_ID_NONE, 0 },
};
diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index f26951d..679afcd 100644
--- a/libavformat/aiffdec.c
+++ b/libavformat/aiffdec.c
@@ -154,6 +154,7 @@ static int get_aiff_header(AVFormatContext *s, int size,
codec->bits_per_coded_sample = 5;
case AV_CODEC_ID_ADPCM_G722:
case AV_CODEC_ID_MACE6:
+ case AV_CODEC_ID_SDX2_DPCM:
codec->block_align = 1*codec->channels;
break;
case AV_CODEC_ID_GSM:
diff --git a/libavformat/genh.c b/libavformat/genh.c
index 6e4abae..97068b4 100644
--- a/libavformat/genh.c
+++ b/libavformat/genh.c
@@ -84,6 +84,7 @@ static int genh_read_header(AVFormatContext *s)
case 5: st->codec->codec_id = st->codec->block_align > 0 ?
AV_CODEC_ID_PCM_S8_PLANAR :
AV_CODEC_ID_PCM_S8; break;
+ case 6: st->codec->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
case 7: ret = ff_alloc_extradata(st->codec, 2);
if (ret < 0)
return ret;
@@ -168,6 +169,9 @@ static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
}
}
ret = 0;
+ } else if (codec->codec_id == AV_CODEC_ID_SDX2_DPCM) {
+ ret = av_get_packet(s->pb, pkt, codec->block_align * 1024);
+
} else {
ret = av_get_packet(s->pb, pkt, codec->block_align ? codec->block_align : 1024 * codec->channels);
}
--
1.9.1
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