Hi!
Attached patch allows to read files produced by the "ITU compatible
binary G726 encoder" attached to ticket #6596.
Please comment, Carl Eugen
From a145fb0c3bade64d1aca40ea02a651f4e65ffb2f Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <ceffm...@gmail.com>
Date: Fri, 18 Aug 2017 19:10:56 +0200
Subject: [PATCH] lavf/g726: Demuxer for raw little-endian G.726 streams
Compatible with the binary encoder attached to ticket #6596.
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/g726.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++
libavformat/version.h | 2 +-
4 files changed, 85 insertions(+), 1 deletion(-)
create mode 100644 libavformat/g726.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index b0ef82c..5cc529b 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -188,6 +188,7 @@ OBJS-$(CONFIG_GSM_MUXER) += rawenc.o
OBJS-$(CONFIG_GXF_DEMUXER) += gxf.o
OBJS-$(CONFIG_GXF_MUXER) += gxfenc.o audiointerleave.o
OBJS-$(CONFIG_G722_DEMUXER) += g722.o rawdec.o
+OBJS-$(CONFIG_G726LE_DEMUXER) += g726.o
OBJS-$(CONFIG_G722_MUXER) += rawenc.o
OBJS-$(CONFIG_G723_1_DEMUXER) += g723_1.o
OBJS-$(CONFIG_G723_1_MUXER) += rawenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 1ebc142..5fce02a 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -132,6 +132,7 @@ static void register_all(void)
REGISTER_DEMUXER (FRM, frm);
REGISTER_DEMUXER (FSB, fsb);
REGISTER_MUXDEMUX(G722, g722);
+ REGISTER_DEMUXER (G726LE, g726le);
REGISTER_MUXDEMUX(G723_1, g723_1);
REGISTER_DEMUXER (G729, g729);
REGISTER_DEMUXER (GDV, gdv);
diff --git a/libavformat/g726.c b/libavformat/g726.c
new file mode 100644
index 0000000..7ee6313
--- /dev/null
+++ b/libavformat/g726.c
@@ -0,0 +1,82 @@
+/*
+ * G.726 raw demuxer
+ * Copyright 2017 Carl Eugen Hoyos
+ *
+ * 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 "internal.h"
+#include "libavutil/opt.h"
+
+typedef struct G726Context {
+ AVClass *class;
+ int code_size;
+ int sample_rate;
+} G726Context;
+
+static int g726_read_header(AVFormatContext *s)
+{
+ G726Context *c = s->priv_data;
+ AVStream *st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->codec_id = s->iformat->raw_codec_id;
+
+ st->codecpar->sample_rate = c->sample_rate;
+ st->codecpar->bits_per_coded_sample = c->code_size;
+ st->codecpar->channels = 1;
+
+ return 0;
+}
+
+static int g726_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int res;
+ res = av_get_packet(s->pb, pkt, 1020); // a size similar to RAW_PACKET_SIZE divisible by all code_size values
+ if (res < 0)
+ return res;
+ return 0;
+}
+
+#define OFFSET(x) offsetof(G726Context, x)
+static const AVOption options[] = {
+ { "code_size", "Bits per G.726 code",
+ OFFSET(code_size), AV_OPT_TYPE_INT, {.i64 = 4}, 2, 5, AV_OPT_FLAG_DECODING_PARAM },
+ { "sample_rate", "",
+ OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 8000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+ { NULL },
+};
+
+static const AVClass g726le_demuxer_class = {
+ .class_name = "G.726 little-endian demuxer",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_g726le_demuxer = {
+ .name = "g726le",
+ .long_name = NULL_IF_CONFIG_SMALL("raw little-endian G.726"),
+ .read_header = g726_read_header,
+ .read_packet = g726_read_packet,
+ .priv_data_size = sizeof(G726Context),
+ .priv_class = &g726le_demuxer_class,
+ .raw_codec_id = AV_CODEC_ID_ADPCM_G726LE,
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index 48b81f2..a8cf4c1 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -32,7 +32,7 @@
// Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
// Also please add any ticket numbers that you believe might be affected here
#define LIBAVFORMAT_VERSION_MAJOR 57
-#define LIBAVFORMAT_VERSION_MINOR 76
+#define LIBAVFORMAT_VERSION_MINOR 77
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
--
1.7.10.4
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