support for Sierra Online audio files and Apple QuickDraw codec,

courtesy of Konstantin Shishkov

Originally committed as revision 3529 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 166 insertions, 0 deletions

diff --git a/libavformat/sol.c b/libavformat/sol.c
new file mode 100644
index 0000000000..2631310c9b
--- /dev/null
+++ b/libavformat/sol.c
@@ -0,0 +1,166 @@
+/* 
+ * Sierra SOL decoder
+ * Copyright Konstantin Shishkov.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/* 
+ * Based on documents from Game Audio Player and own research
+ */
+
+#include "avformat.h"
+#include "avi.h"
+#include "bswap.h"
+
+/* if we don't know the size in advance */
+#define AU_UNKOWN_SIZE ((uint32_t)(~0))
+
+static int sol_probe(AVProbeData *p)
+{
+    /* check file header */
+    uint16_t magic;
+    if (p->buf_size <= 14)
+        return 0;
+    magic=le2me_16(*((uint16_t*)p->buf));
+    if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
+        p->buf[2] == 'S' && p->buf[3] == 'O' &&
+        p->buf[4] == 'L' && p->buf[5] == 0)
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+#define SOL_DPCM    1
+#define SOL_16BIT   4
+#define SOL_STEREO 16
+
+static int sol_codec_id(int magic, int type)
+{
+    if (magic == 0x0B8D)
+    {
+        if (type & SOL_DPCM) return CODEC_ID_SOL_DPCM;
+        else return CODEC_ID_PCM_U8;
+    }
+    if (type & SOL_DPCM)
+    {
+        if (type & SOL_16BIT) return CODEC_ID_SOL_DPCM;
+        else if (magic == 0x0C8D) return CODEC_ID_SOL_DPCM;
+        else return CODEC_ID_SOL_DPCM;
+    }
+    if (type & SOL_16BIT) return CODEC_ID_PCM_S16LE;
+    return CODEC_ID_PCM_U8;
+}
+
+static int sol_codec_type(int magic, int type)
+{
+    if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
+    if (type & SOL_DPCM)
+    {
+        if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
+        else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
+        else return 2;//SOL_DPCM_NEW8;
+    }
+    return -1;
+}
+
+static int sol_channels(int magic, int type)
+{
+    if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
+    return 2;
+}
+    
+static int sol_read_header(AVFormatContext *s,
+                          AVFormatParameters *ap)
+{
+    int size;
+    unsigned int magic,tag;
+    ByteIOContext *pb = &s->pb;
+    unsigned int id, codec, channels, rate, type;
+    AVStream *st;
+
+    /* check ".snd" header */
+    magic = get_le16(pb);
+    tag = get_le32(pb);
+    if (tag != MKTAG('S', 'O', 'L', 0))
+        return -1;
+    rate = get_le16(pb);
+    type = get_byte(pb);
+    size = get_le32(pb);
+    if (magic != 0x0B8D)
+        get_byte(pb); /* newer SOLs contain padding byte */
+    
+    codec = sol_codec_id(magic, type);
+    channels = sol_channels(magic, type);
+    
+    if (codec == CODEC_ID_SOL_DPCM)
+        id = sol_codec_type(magic, type);
+    else id = 0;
+    
+    /* now we are ready: build format streams */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return -1;
+    st->codec.codec_type = CODEC_TYPE_AUDIO;
+    st->codec.codec_tag = id;
+    st->codec.codec_id = codec;
+    st->codec.channels = channels;
+    st->codec.sample_rate = rate;
+    return 0;
+}
+
+#define MAX_SIZE 4096
+
+static int sol_read_packet(AVFormatContext *s,
+                          AVPacket *pkt)
+{
+    int ret;
+
+    if (url_feof(&s->pb))
+        return -EIO;
+    if (av_new_packet(pkt, MAX_SIZE))
+        return -EIO;
+    pkt->stream_index = 0;
+
+    ret = get_buffer(&s->pb, pkt->data, pkt->size);
+    if (ret < 0)
+        av_free_packet(pkt);
+    /* note: we need to modify the packet size here to handle the last
+       packet */
+    pkt->size = ret;
+    return 0;
+}
+
+static int sol_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+static AVInputFormat sol_iformat = {
+    "sol",
+    "Sierra SOL Format",
+    0,
+    sol_probe,
+    sol_read_header,
+    sol_read_packet,
+    sol_read_close,
+    pcm_read_seek,
+};
+
+int sol_init(void)
+{
+    av_register_input_format(&sol_iformat);
+    return 0;
+}