[FFmpeg-devel] [PATCH] avcodec: add CBD2 DPCM decoder

[Paul B Mahol <onemda@gmail.com>]

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Hi,

Patch attached.

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From 0c4254ed685660fe1bb714a32ea378ddbb23e64e Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Tue, 24 Jan 2023 16:14:25 +0100
Subject: [PATCH] avcodec: add CBD2 DPCM decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavcodec/Makefile     |  1 +
 libavcodec/allcodecs.c  |  1 +
 libavcodec/codec_desc.c |  7 +++++++
 libavcodec/codec_id.h   |  1 +
 libavcodec/dpcm.c       | 10 ++++++++++
 libavformat/aiff.c      |  1 +
 libavformat/aiffdec.c   |  1 +
 7 files changed, 22 insertions(+)

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index bfa8132580..e691c8d180 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -277,6 +277,7 @@ OBJS-$(CONFIG_BRENDER_PIX_DECODER)     += brenderpix.o
 OBJS-$(CONFIG_C93_DECODER)             += c93.o
 OBJS-$(CONFIG_CAVS_DECODER)            += cavs.o cavsdec.o cavsdsp.o \
                                           cavsdata.o
+OBJS-$(CONFIG_CBD2_DECODER)            += dpcm.o
 OBJS-$(CONFIG_CCAPTION_DECODER)        += ccaption_dec.o ass.o
 OBJS-$(CONFIG_CDGRAPHICS_DECODER)      += cdgraphics.o
 OBJS-$(CONFIG_CDTOONS_DECODER)         += cdtoons.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index a5ab0cb4fe..74e1b00e96 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -621,6 +621,7 @@ extern const FFCodec ff_pcm_vidc_encoder;
 extern const FFCodec ff_pcm_vidc_decoder;
 
 /* DPCM codecs */
+extern const FFCodec ff_cbd2_dpcm_decoder;
 extern const FFCodec ff_derf_dpcm_decoder;
 extern const FFCodec ff_gremlin_dpcm_decoder;
 extern const FFCodec ff_interplay_dpcm_decoder;
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index f4cbdf744b..6ecdf1002b 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -2626,6 +2626,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("DPCM Marble WADY"),
         .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_CBD2_DPCM,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "cbd2_dpcm",
+        .long_name = NULL_IF_CONFIG_SMALL("DPCM Cuberoot-Delta-Exact"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+    },
 
     /* audio codecs */
     {
diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
index 60e36cc8a9..ba3b432387 100644
--- a/libavcodec/codec_id.h
+++ b/libavcodec/codec_id.h
@@ -431,6 +431,7 @@ enum AVCodecID {
     AV_CODEC_ID_GREMLIN_DPCM,
     AV_CODEC_ID_DERF_DPCM,
     AV_CODEC_ID_WADY_DPCM,
+    AV_CODEC_ID_CBD2_DPCM,
 
     /* audio codecs */
     AV_CODEC_ID_MP2 = 0x15000,
diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c
index 86cb9134f8..6ea9e2c065 100644
--- a/libavcodec/dpcm.c
+++ b/libavcodec/dpcm.c
@@ -194,6 +194,13 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx)
         }
         break;
 
+    case AV_CODEC_ID_CBD2_DPCM:
+        for (i = -128; i < 128; i++) {
+            int16_t cube = (i * i * i) / 64;
+            s->array[i+128] = cube;
+        }
+        break;
+
     case AV_CODEC_ID_GREMLIN_DPCM: {
         int delta = 0;
         int code = 64;
@@ -265,6 +272,7 @@ static int dpcm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     case AV_CODEC_ID_WADY_DPCM:
     case AV_CODEC_ID_DERF_DPCM:
     case AV_CODEC_ID_GREMLIN_DPCM:
+    case AV_CODEC_ID_CBD2_DPCM:
     case AV_CODEC_ID_SDX2_DPCM:
         out = buf_size;
         break;
@@ -386,6 +394,7 @@ static int dpcm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
         }
         break;
 
+    case AV_CODEC_ID_CBD2_DPCM:
     case AV_CODEC_ID_SDX2_DPCM:
         while (output_samples < samples_end) {
             int8_t n = bytestream2_get_byteu(&gb);
@@ -468,6 +477,7 @@ const FFCodec ff_ ## name_ ## _decoder = {                  \
     FF_CODEC_DECODE_CB(dpcm_decode_frame),                  \
 }
 
+DPCM_DECODER(AV_CODEC_ID_CBD2_DPCM,      cbd2_dpcm,      "DPCM Cuberoot-Delta-Exact");
 DPCM_DECODER(AV_CODEC_ID_DERF_DPCM,      derf_dpcm,      "DPCM Xilam DERF");
 DPCM_DECODER(AV_CODEC_ID_GREMLIN_DPCM,   gremlin_dpcm,   "DPCM Gremlin");
 DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay");
diff --git a/libavformat/aiff.c b/libavformat/aiff.c
index 0f25b436bd..1ceac69a70 100644
--- a/libavformat/aiff.c
+++ b/libavformat/aiff.c
@@ -46,6 +46,7 @@ const AVCodecTag ff_codec_aiff_tags[] = {
     { AV_CODEC_ID_QDMC,         MKTAG('Q','D','M','C') },
     { AV_CODEC_ID_QDM2,         MKTAG('Q','D','M','2') },
     { AV_CODEC_ID_QCELP,        MKTAG('Q','c','l','p') },
+    { AV_CODEC_ID_CBD2_DPCM,    MKTAG('C','B','D','2') },
     { AV_CODEC_ID_SDX2_DPCM,    MKTAG('S','D','X','2') },
     { AV_CODEC_ID_ADPCM_IMA_WS, MKTAG('A','D','P','4') },
     { AV_CODEC_ID_NONE,         0 },
diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index 80733e5801..1cde12c193 100644
--- a/libavformat/aiffdec.c
+++ b/libavformat/aiffdec.c
@@ -164,6 +164,7 @@ static int get_aiff_header(AVFormatContext *s, int64_t size,
         case AV_CODEC_ID_ADPCM_IMA_WS:
         case AV_CODEC_ID_ADPCM_G722:
         case AV_CODEC_ID_MACE6:
+        case AV_CODEC_ID_CBD2_DPCM:
         case AV_CODEC_ID_SDX2_DPCM:
             par->block_align = 1 * channels;
             break;
-- 
2.39.1


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