G.723.1 demuxer and decoder

[ffmpeg] / libavformat / g723_1.c

diff --git a/libavformat/g723_1.c b/libavformat/g723_1.c
new file mode 100644 (file)
index 0000000..415d01b
--- /dev/null
+++ b/libavformat/g723_1.c
@@ -0,0 +1,85 @@
+/*
+ * G.723.1 demuxer
+ * Copyright (c) 2010 Mohamed Naufal Basheer
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * G.723.1 demuxer
+ */
+
+#include "libavutil/audioconvert.h"
+#include "avformat.h"
+#include "internal.h"
+
+static const uint8_t frame_size[4] = { 24, 20, 4, 1 };
+
+static int g723_1_init(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       = CODEC_ID_G723_1;
+    st->codec->channel_layout = AV_CH_LAYOUT_MONO;
+    st->codec->channels       = 1;
+    st->codec->sample_rate    = 8000;
+
+    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+    st->start_time = 0;
+
+    return 0;
+}
+
+static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int size, byte, ret;
+
+    pkt->pos = avio_tell(s->pb);
+    byte     = avio_r8(s->pb);
+    size     = frame_size[byte & 3];
+
+    ret = av_new_packet(pkt, size);
+    if (ret < 0)
+        return ret;
+
+    pkt->data[0]      = byte;
+    pkt->duration     = 240;
+    pkt->stream_index = 0;
+
+    ret = avio_read(s->pb, pkt->data + 1, size - 1);
+    if (ret < size - 1) {
+        av_free_packet(pkt);
+        return ret < 0 ? ret : AVERROR_EOF;
+    }
+
+    return pkt->size;
+}
+
+AVInputFormat ff_g723_1_demuxer = {
+    .name        = "g723_1",
+    .long_name   = NULL_IF_CONFIG_SMALL("G.723.1 format"),
+    .read_header = g723_1_init,
+    .read_packet = g723_1_read_packet,
+    .extensions  = "tco",
+    .flags       = AVFMT_GENERIC_INDEX
+};