CRYO APC demuxer

patch by Anssi Hannula, anssi.hannula gmail com

Originally committed as revision 8656 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -79,6 +79,7 @@ version <next>
 - Blackfin optimizations
 - Interplay C93 demuxer and video decoder
 - Bethsoft VID demuxer and video decoder
+- CRYO APC demuxer
 
 version 0.4.9-pre1:
 

doc/ffmpeg-doc.texi

@@ -907,6 +907,8 @@ different game cutscenes repacked for use with ScummVM.
 @tab Used in the game Cyberia from Interplay.
 @item Bethsoft VID @tab    @tab X
 @tab Used in some games from Bethesda Softworks.
+@item CRYO APC @tab    @tab X
+@tab Audio format used in some games by CRYO Interactive Entertainment.
 @end multitable
 
 @code{X} means that encoding (resp. decoding) is supported.

libavcodec/adpcm.c

@@ -612,6 +612,12 @@ static int adpcm_decode_init(AVCodecContext * avctx)
     case CODEC_ID_ADPCM_CT:
         c->status[0].step = c->status[1].step = 511;
         break;
+    case CODEC_ID_ADPCM_IMA_WS:
+        if (avctx->extradata && avctx->extradata_size == 2 * 4) {
+            c->status[0].predictor = AV_RL32(avctx->extradata);
+            c->status[1].predictor = AV_RL32(avctx->extradata + 4);
+        }
+        break;
     default:
         break;
     }

libavformat/Makefile

@@ -17,6 +17,7 @@ OBJS-$(CONFIG_AIFF_DEMUXER)              += aiff.o riff.o
 OBJS-$(CONFIG_AIFF_MUXER)                += aiff.o riff.o
 OBJS-$(CONFIG_AMR_DEMUXER)               += amr.o
 OBJS-$(CONFIG_AMR_MUXER)                 += amr.o
+OBJS-$(CONFIG_APC_DEMUXER)               += apc.o
 OBJS-$(CONFIG_ASF_DEMUXER)               += asf.o riff.o
 OBJS-$(CONFIG_ASF_MUXER)                 += asf-enc.o riff.o
 OBJS-$(CONFIG_ASF_STREAM_MUXER)          += asf-enc.o riff.o

libavformat/allformats.c

@@ -49,6 +49,7 @@ void av_register_all(void)
     REGISTER_MUXER   (ADTS, adts);
     REGISTER_MUXDEMUX(AIFF, aiff);
     REGISTER_MUXDEMUX(AMR, amr);
+    REGISTER_DEMUXER (APC, apc);
     REGISTER_MUXDEMUX(ASF, asf);
     REGISTER_MUXER   (ASF_STREAM, asf_stream);
     REGISTER_MUXDEMUX(AU, au);

libavformat/allformats.h

@@ -26,6 +26,7 @@ extern AVInputFormat aac_demuxer;
 extern AVInputFormat ac3_demuxer;
 extern AVInputFormat aiff_demuxer;
 extern AVInputFormat amr_demuxer;
+extern AVInputFormat apc_demuxer;
 extern AVInputFormat asf_demuxer;
 extern AVInputFormat au_demuxer;
 extern AVInputFormat audio_demuxer;

libavformat/apc.c

@@ -0,0 +1,93 @@
+/*
+ * CRYO APC audio format demuxer
+ * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
+ *
+ * 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"
+#include "string.h"
+
+static int apc_probe(AVProbeData *p)
+{
+    if (p->buf_size < 8)
+        return 0;
+
+    if (!strncmp(p->buf, "CRYO_APC", 8))
+        return AVPROBE_SCORE_MAX;
+
+    return 0;
+}
+
+static int apc_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+
+    get_le32(pb); /* CRYO */
+    get_le32(pb); /* _APC */
+    get_le32(pb); /* 1.20 */
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+
+    st->codec->codec_type = CODEC_TYPE_AUDIO;
+    st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
+
+    get_le32(pb); /* number of samples */
+    st->codec->sample_rate = get_le32(pb);
+
+    st->codec->extradata_size = 2 * 4;
+    st->codec->extradata = av_malloc(st->codec->extradata_size +
+                                     FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!st->codec->extradata)
+        return AVERROR_NOMEM;
+
+    /* initial predictor values for adpcm decoder */
+    get_buffer(pb, st->codec->extradata, 2 * 4);
+
+    st->codec->channels = 1;
+    if (get_le32(pb))
+        st->codec->channels = 2;
+
+    st->codec->bits_per_sample = 4;
+    st->codec->bit_rate = st->codec->bits_per_sample * st->codec->channels
+                          * st->codec->sample_rate;
+    st->codec->block_align = 1;
+
+    return 0;
+}
+
+#define MAX_READ_SIZE 4096
+
+static int apc_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    if (av_get_packet(&s->pb, pkt, MAX_READ_SIZE) <= 0)
+        return AVERROR_IO;
+    pkt->stream_index = 0;
+    return 0;
+}
+
+AVInputFormat apc_demuxer = {
+    "apc",
+    "CRYO APC format",
+    0,
+    apc_probe,
+    apc_read_header,
+    apc_read_packet,
+};