CD+G demuxer and decoder

Patch by Michael Tison (gmail address: blackspike@....)

Originally committed as revision 20890 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -44,6 +44,7 @@ version <next>:
 - MPEG-4 Audio Lossless Coding (ALS) decoder
 - -formats option split into -formats, -codecs, -bsfs, and -protocols
 - IV8 demuxer
+- CDG demuxer and decoder
 
 
 

doc/general.texi

@@ -63,6 +63,8 @@ library:
     @tab Used in the game Cyberia from Interplay.
 @item Delphine Software International CIN @tab   @tab X
     @tab Multimedia format used by Delphine Software games.
+@item CD+G                      @tab   @tab X
+    @tab Video format used by CD+G karaoke disks
 @item Core Audio Format         @tab   @tab X
     @tab Apple Core Audio Format
 @item CRC testing format        @tab X @tab
@@ -329,6 +331,8 @@ following image formats are supported:
     @tab Codec used in Cyberia game.
 @item CamStudio              @tab     @tab  X
     @tab fourcc: CSCD
+@item CD+G                   @tab     @tab  X
+    @tab Video codec for CD+G karaoke disks
 @item Chinese AVS video      @tab     @tab  X
     @tab AVS1-P2, JiZhun profile
 @item Delphine Software International CIN video  @tab     @tab  X

libavcodec/Makefile

@@ -68,6 +68,7 @@ OBJS-$(CONFIG_BMP_ENCODER)             += bmpenc.o
 OBJS-$(CONFIG_C93_DECODER)             += c93.o
 OBJS-$(CONFIG_CAVS_DECODER)            += cavs.o cavsdec.o cavsdsp.o \
                                           mpeg12data.o mpegvideo.o
+OBJS-$(CONFIG_CDGRAPHICS_DECODER)      += cdgraphics.o
 OBJS-$(CONFIG_CINEPAK_DECODER)         += cinepak.o
 OBJS-$(CONFIG_CLJR_DECODER)            += cljr.o
 OBJS-$(CONFIG_CLJR_ENCODER)            += cljr.o

libavcodec/allcodecs.c

@@ -71,6 +71,7 @@ void avcodec_register_all(void)
     REGISTER_ENCDEC  (BMP, bmp);
     REGISTER_DECODER (C93, c93);
     REGISTER_DECODER (CAVS, cavs);
+    REGISTER_DECODER (CDGRAPHICS, cdgraphics);
     REGISTER_DECODER (CINEPAK, cinepak);
     REGISTER_DECODER (CLJR, cljr);
     REGISTER_DECODER (CSCD, cscd);

libavcodec/avcodec.h

@@ -200,6 +200,7 @@ enum CodecID {
     CODEC_ID_MAD,
     CODEC_ID_FRWU,
     CODEC_ID_FLASHSV2,
+    CODEC_ID_CDGRAPHICS,
 
     /* various PCM "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,

libavformat/Makefile

@@ -44,6 +44,7 @@ OBJS-$(CONFIG_BFI_DEMUXER)               += bfi.o
 OBJS-$(CONFIG_C93_DEMUXER)               += c93.o vocdec.o voc.o
 OBJS-$(CONFIG_CAF_DEMUXER)               += cafdec.o caf.o mov.o riff.o isom.o
 OBJS-$(CONFIG_CAVSVIDEO_DEMUXER)         += raw.o
+OBJS-$(CONFIG_CDG_DEMUXER)               += cdg.o
 OBJS-$(CONFIG_CRC_MUXER)                 += crcenc.o
 OBJS-$(CONFIG_DAUD_DEMUXER)              += daud.o
 OBJS-$(CONFIG_DAUD_MUXER)                += daud.o

libavformat/allformats.c

@@ -68,6 +68,7 @@ void av_register_all(void)
     REGISTER_DEMUXER  (C93, c93);
     REGISTER_DEMUXER  (CAF, caf);
     REGISTER_DEMUXER  (CAVSVIDEO, cavsvideo);
+    REGISTER_DEMUXER  (CDG, cdg);
     REGISTER_MUXER    (CRC, crc);
     REGISTER_MUXDEMUX (DAUD, daud);
     REGISTER_MUXDEMUX (DIRAC, dirac);

libavformat/avformat.h

@@ -22,7 +22,7 @@
 #define AVFORMAT_AVFORMAT_H
 
 #define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 43
+#define LIBAVFORMAT_VERSION_MINOR 44
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \

libavformat/cdg.c

+/*
+ * CD Graphics Demuxer
+ * Copyright (c) 2009 Michael Tison
+ *
+ * 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 "avformat.h"
+
+#define CDG_PACKET_SIZE    24
+
+static int read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    AVStream *vst;
+    int ret;
+
+    vst = av_new_stream(s, 0);
+    if (!vst)
+        return AVERROR(ENOMEM);
+
+    vst->codec->codec_type = CODEC_TYPE_VIDEO;
+    vst->codec->codec_id   = CODEC_ID_CDGRAPHICS;
+
+    /// 75 sectors/sec * 4 packets/sector = 300 packets/sec
+    av_set_pts_info(vst, 32, 1, 300);
+
+    ret = url_fsize(s->pb);
+    if (ret > 0)
+        vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300);
+
+    return 0;
+}
+
+static int read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret;
+
+    ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
+
+    pkt->stream_index = 0;
+    return ret;
+}
+
+AVInputFormat cdg_demuxer = {
+    "cdg",
+    NULL_IF_CONFIG_SMALL("CD Graphics Format"),
+    0,
+    NULL,
+    read_header,
+    read_packet,
+    .extensions = "cdg"
+};