Add the G723.1 demuxer and decoder

libavformat/g723_1.c

@@ -0,0 +1,83 @@
+/*
+ * G.723.1 demuxer
+ * Copyright (c) 2010 Mohamed Naufal Basheer
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * G.723.1 demuxer
+ */
+
+#include "avformat.h"
+
+static const uint8_t frame_size[4] = {24, 20, 4, 1};
+
+static int g723_1_init(AVFormatContext *s, AVFormatParameters *ap)
+{
+    AVStream *st;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id    = CODEC_ID_G723_1;
+    st->codec->channels    = 1;
+    st->codec->sample_rate = 8000;
+
+    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+    return 0;
+}
+
+static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int size, byte, ret;
+
+    pkt->pos = url_ftell(s->pb);
+    byte     = get_byte(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 = get_buffer(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 = {
+    "g723_1",
+    NULL_IF_CONFIG_SMALL("G.723.1 format"),
+    0,
+    NULL,
+    g723_1_init,
+    g723_1_read_packet,
+    .extensions = "tco",
+    .flags = AVFMT_GENERIC_INDEX
+};