ffmpeg-2.8.5

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

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

@@ -0,0 +1,98 @@
+/*
+ * ADP demuxer
+ * Copyright (c) 2013 James Almer
+ *
+ * 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 "libavutil/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+
+static int adp_probe(AVProbeData *p)
+{
+    int i, changes = 0;
+    char last = 0;
+
+    if (p->buf_size < 32)
+        return 0;
+
+    for (i = 0; i < p->buf_size - 3; i+=32) {
+        if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3])
+            return 0;
+        if (p->buf[i] != last)
+            changes++;
+        last = p->buf[i];
+    }
+    if (changes <= 1)
+        return 0;
+
+    return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4;
+}
+
+static int adp_read_header(AVFormatContext *s)
+{
+    AVStream *st;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id       = AV_CODEC_ID_ADPCM_DTK;
+    st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
+    st->codec->channels       = 2;
+    st->codec->sample_rate    = 48000;
+    st->start_time            = 0;
+    if (s->pb->seekable)
+        st->duration          = av_get_audio_frame_duration(st->codec, avio_size(s->pb));
+
+    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+    return 0;
+}
+
+static int adp_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret, size = 1024;
+
+    if (avio_feof(s->pb))
+        return AVERROR_EOF;
+
+    ret = av_get_packet(s->pb, pkt, size);
+
+    if (ret != size) {
+        if (ret < 0) {
+            av_free_packet(pkt);
+            return ret;
+        }
+        av_shrink_packet(pkt, ret);
+    }
+    pkt->stream_index = 0;
+
+    return ret;
+}
+
+AVInputFormat ff_adp_demuxer = {
+    .name           = "adp",
+    .long_name      = NULL_IF_CONFIG_SMALL("ADP"),
+    .read_probe     = adp_probe,
+    .read_header    = adp_read_header,
+    .read_packet    = adp_read_packet,
+    .extensions     = "adp,dtk",
+};