ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavformat/sol.c

@@ -0,0 +1,148 @@
+/*
+ * Sierra SOL demuxer
+ * Copyright Konstantin Shishkov
+ *
+ * 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
+ */
+
+/*
+ * Based on documents from Game Audio Player and own research
+ */
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+#include "pcm.h"
+
+/* if we don't know the size in advance */
+#define AU_UNKNOWN_SIZE ((uint32_t)(~0))
+
+static int sol_probe(AVProbeData *p)
+{
+    /* check file header */
+    uint16_t magic = AV_RL32(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 enum AVCodecID sol_codec_id(int magic, int type)
+{
+    if (type & SOL_DPCM)
+        return AV_CODEC_ID_SOL_DPCM;
+
+    if (magic == 0x0B8D)
+        return AV_CODEC_ID_PCM_U8;
+
+    if (type & SOL_16BIT)
+        return AV_CODEC_ID_PCM_S16LE;
+
+    return AV_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)
+{
+    unsigned int magic,tag;
+    AVIOContext *pb = s->pb;
+    unsigned int id, channels, rate, type;
+    enum AVCodecID codec;
+    AVStream *st;
+
+    /* check ".snd" header */
+    magic = avio_rl16(pb);
+    tag = avio_rl32(pb);
+    if (tag != MKTAG('S', 'O', 'L', 0))
+        return -1;
+    rate = avio_rl16(pb);
+    type = avio_r8(pb);
+    avio_skip(pb, 4); /* size */
+    if (magic != 0x0B8D)
+        avio_r8(pb); /* newer SOLs contain padding byte */
+
+    codec = sol_codec_id(magic, type);
+    channels = sol_channels(magic, type);
+
+    if (codec == AV_CODEC_ID_SOL_DPCM)
+        id = sol_codec_type(magic, type);
+    else id = 0;
+
+    /* now we are ready: build format streams */
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return -1;
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_tag = id;
+    st->codec->codec_id = codec;
+    st->codec->channels = channels;
+    st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
+                                                AV_CH_LAYOUT_STEREO;
+    st->codec->sample_rate = rate;
+    avpriv_set_pts_info(st, 64, 1, rate);
+    return 0;
+}
+
+#define MAX_SIZE 4096
+
+static int sol_read_packet(AVFormatContext *s,
+                          AVPacket *pkt)
+{
+    int ret;
+
+    if (avio_feof(s->pb))
+        return AVERROR(EIO);
+    ret= av_get_packet(s->pb, pkt, MAX_SIZE);
+    if (ret < 0)
+        return ret;
+    pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
+    pkt->stream_index = 0;
+    return 0;
+}
+
+AVInputFormat ff_sol_demuxer = {
+    .name           = "sol",
+    .long_name      = NULL_IF_CONFIG_SMALL("Sierra SOL"),
+    .read_probe     = sol_probe,
+    .read_header    = sol_read_header,
+    .read_packet    = sol_read_packet,
+    .read_seek      = ff_pcm_read_seek,
+};