lavf: Raw G.729 demuxer

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Changelog

@@ -56,6 +56,7 @@ version <next>:
 - VAAPI-accelerate H.264/HEVC/MJPEG encoding
 - Generic OpenMAX IL encoder with support for Raspberry Pi
 - MMAL-accelerated MPEG-2 and VC-1 decoding
+- G.729 raw demuxer
 
 
 version 11:

libavformat/Makefile

@@ -140,6 +140,7 @@ OBJS-$(CONFIG_G722_DEMUXER)              += g722.o rawdec.o
 OBJS-$(CONFIG_G722_MUXER)                += rawenc.o
 OBJS-$(CONFIG_G723_1_DEMUXER)            += g723_1.o
 OBJS-$(CONFIG_G723_1_MUXER)              += rawenc.o
+OBJS-$(CONFIG_G729_DEMUXER)              += g729dec.o
 OBJS-$(CONFIG_GIF_MUXER)                 += gif.o
 OBJS-$(CONFIG_GSM_DEMUXER)               += gsmdec.o
 OBJS-$(CONFIG_GXF_DEMUXER)               += gxf.o

libavformat/allformats.c

@@ -105,6 +105,7 @@ void av_register_all(void)
     REGISTER_MUXER   (FRAMEMD5,         framemd5);
     REGISTER_MUXDEMUX(G722,             g722);
     REGISTER_MUXDEMUX(G723_1,           g723_1);
+    REGISTER_DEMUXER (G729,             g729);
     REGISTER_MUXER   (GIF,              gif);
     REGISTER_DEMUXER (GSM,              gsm);
     REGISTER_MUXDEMUX(GXF,              gxf);

libavformat/g729dec.c

@@ -0,0 +1,105 @@
+/*
+ * G.729 raw format demuxer
+ * Copyright (c) 2011 Vladimir Voroshilov
+ *
+ * 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
+ */
+
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
+
+#include "avformat.h"
+#include "internal.h"
+
+typedef struct G729DemuxerContext {
+    AVClass *class;
+
+    int bit_rate;
+} G729DemuxerContext;
+
+static int g729_read_header(AVFormatContext *s)
+{
+    AVStream* st;
+    G729DemuxerContext *s1 = s->priv_data;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codecpar->codec_id    = AV_CODEC_ID_G729;
+    st->codecpar->sample_rate = 8000;
+    st->codecpar->channels    = 1;
+
+    if (s1 && s1->bit_rate)
+        s->bit_rate = s1->bit_rate;
+
+    switch(s->bit_rate) {
+    case 6400:
+        st->codecpar->block_align = 8;
+        break;
+    case 8000:
+        st->codecpar->block_align = 10;
+        break;
+    default:
+        av_log(s, AV_LOG_ERROR, "Invalid bit_rate value %d. "
+               "Only 6400 and 8000 b/s are supported.", s->bit_rate);
+        return AVERROR(EINVAL);
+    }
+
+    avpriv_set_pts_info(st, st->codecpar->block_align << 3, 1,
+                        st->codecpar->sample_rate);
+
+    return 0;
+}
+
+static int g729_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVStream *st = s->streams[0];
+    int ret = av_get_packet(s->pb, pkt, st->codecpar->block_align);
+    if (ret < 0)
+        return ret;
+
+    pkt->stream_index = 0;
+    pkt->dts = pkt->pts = pkt->pos / st->codecpar->block_align;
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(G729DemuxerContext, x)
+static const AVOption g729_options[] = {
+    { "bit_rate", "", OFFSET(bit_rate), AV_OPT_TYPE_INT, { .i64 = 8000 }, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+    { NULL },
+};
+
+static const AVClass g729_demuxer_class = {
+    .class_name = "g729 demuxer",
+    .item_name  = av_default_item_name,
+    .option     = g729_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_g729_demuxer = {
+    .name           = "g729",
+    .long_name      = NULL_IF_CONFIG_SMALL("G.729 raw format demuxer"),
+    .priv_data_size = sizeof(G729DemuxerContext),
+    .read_header    = g729_read_header,
+    .read_packet    = g729_read_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "g729",
+    .priv_class     = &g729_demuxer_class,
+};

libavformat/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 57
-#define LIBAVFORMAT_VERSION_MINOR  5
-#define LIBAVFORMAT_VERSION_MICRO  2
+#define LIBAVFORMAT_VERSION_MINOR  6
+#define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \