[FFmpeg-cvslog] avformat/g728dec: raw G.728 demuxer

[Peter Ross]

ffmpeg | branch: master | Peter Ross <pross at xvid.org> | Thu Dec 19 22:57:20 2024 +1100| [52f62468aa1b7a63304524c3aca3e3c0e75ec8d0] | committer: Peter Ross

avformat/g728dec: raw G.728 demuxer

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=52f62468aa1b7a63304524c3aca3e3c0e75ec8d0
---

 doc/general_contents.texi |  1 +
 libavformat/Makefile      |  1 +
 libavformat/allformats.c  |  1 +
 libavformat/g728dec.c     | 58 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 61 insertions(+)

diff --git a/doc/general_contents.texi b/doc/general_contents.texi
index a877b173ba..052ccdf109 100644
--- a/doc/general_contents.texi
+++ b/doc/general_contents.texi
@@ -638,6 +638,7 @@ library:
 @item raw E-AC-3                @tab X @tab X
 @item raw EVC                   @tab X @tab X
 @item raw FLAC                  @tab X @tab X
+ at item raw G.728                 @tab   @tab X
 @item raw GSM                   @tab   @tab X
 @item raw H.261                 @tab X @tab X
 @item raw H.263                 @tab X @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 9884b4a4cb..2e73f1325e 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -247,6 +247,7 @@ OBJS-$(CONFIG_G726_DEMUXER)              += g726.o
 OBJS-$(CONFIG_G726_MUXER)                += rawenc.o
 OBJS-$(CONFIG_G726LE_DEMUXER)            += g726.o
 OBJS-$(CONFIG_G726LE_MUXER)              += rawenc.o
+OBJS-$(CONFIG_G728_DEMUXER)              += g728dec.o
 OBJS-$(CONFIG_G729_DEMUXER)              += g729dec.o
 OBJS-$(CONFIG_GDV_DEMUXER)               += gdv.o
 OBJS-$(CONFIG_GENH_DEMUXER)              += genh.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 17215d733d..4e9958bd18 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -191,6 +191,7 @@ extern const FFInputFormat  ff_g726_demuxer;
 extern const FFOutputFormat ff_g726_muxer;
 extern const FFInputFormat  ff_g726le_demuxer;
 extern const FFOutputFormat ff_g726le_muxer;
+extern const FFInputFormat  ff_g728_demuxer;
 extern const FFInputFormat  ff_g729_demuxer;
 extern const FFInputFormat  ff_gdv_demuxer;
 extern const FFInputFormat  ff_genh_demuxer;
diff --git a/libavformat/g728dec.c b/libavformat/g728dec.c
new file mode 100644
index 0000000000..dbf5e64d05
--- /dev/null
+++ b/libavformat/g728dec.c
@@ -0,0 +1,58 @@
+/*
+ * G.728 raw demuxer
+ *
+ * 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 "avformat.h"
+#include "demux.h"
+#include "internal.h"
+
+static int g728_read_header(AVFormatContext *s)
+{
+    AVStream *st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codecpar->codec_id    = ffifmt(s->iformat)->raw_codec_id;
+    st->codecpar->sample_rate = 8000;
+    st->codecpar->bit_rate    = 16000;
+    st->codecpar->block_align = 5;
+    st->codecpar->ch_layout   = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
+    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+
+    return 0;
+}
+
+static int g728_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret = av_get_packet(s->pb, pkt, 1020); // a size similar to RAW_PACKET_SIZE divisible by 5
+    pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
+    pkt->duration = (pkt->size / 5) * 20;
+    return ret;
+}
+
+const FFInputFormat ff_g728_demuxer = {
+    .p.name         = "g728",
+    .p.long_name    = NULL_IF_CONFIG_SMALL("raw G.728"),
+    .p.extensions   = "g728",
+    .p.flags        = AVFMT_GENERIC_INDEX,
+    .read_header    = g728_read_header,
+    .read_packet    = g728_read_packet,
+    .raw_codec_id   = AV_CODEC_ID_G728,
+};