[vlc-devel] [PATCH 07/17] codec: add S/PDIF pass-through decoder

[Thomas Guillem]

---
 modules/MODULES_LIST      |  1 +
 modules/codec/Makefile.am |  2 +
 modules/codec/spdif.c     | 99 +++++++++++++++++++++++++++++++++++++++++++++++
 po/POTFILES.in            |  1 +
 4 files changed, 103 insertions(+)
 create mode 100644 modules/codec/spdif.c

diff --git a/modules/MODULES_LIST b/modules/MODULES_LIST
index 3fd8103..d3579c1 100644
--- a/modules/MODULES_LIST
+++ b/modules/MODULES_LIST
@@ -353,6 +353,7 @@ $Id$
  * sndio: OpenBSD sndio audio output
  * soxr: SoX Resampler library audio filter
  * spatializer: A spatializer audio filter
+ * spdif: S/PDIF audio pass-through decoder
  * speex: a speex audio decoder/packetizer using the libspeex library
  * speex_resampler: audio resampler using the libspeexdsp library
  * spudec: RLE DVD subtitles decoder
diff --git a/modules/codec/Makefile.am b/modules/codec/Makefile.am
index a77476c..6703091 100644
--- a/modules/codec/Makefile.am
+++ b/modules/codec/Makefile.am
@@ -13,6 +13,8 @@ endif
 
 
 ### Audio codecs ###
+libspdif_plugin_la_SOURCES = codec/spdif.c
+codec_LTLIBRARIES += libspdif_plugin.la
 
 liba52_plugin_la_SOURCES = codec/a52.c codec/a52.h
 codec_LTLIBRARIES += liba52_plugin.la
diff --git a/modules/codec/spdif.c b/modules/codec/spdif.c
new file mode 100644
index 0000000..bbd0e4d
--- /dev/null
+++ b/modules/codec/spdif.c
@@ -0,0 +1,99 @@
+/*****************************************************************************
+ * spdif.c: S/PDIF pass-though decoder
+ *****************************************************************************
+ * Copyright (C) 2016 VLC authors and VideoLAN
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_aout.h>
+#include <vlc_codec.h>
+#include <vlc_modules.h>
+
+static int OpenDecoder(vlc_object_t *);
+
+vlc_module_begin()
+    set_category(CAT_INPUT)
+    set_subcategory(SUBCAT_INPUT_ACODEC)
+    set_description(N_("S/PDIF pass-through decoder"))
+    set_capability("decoder", 120)
+    set_callbacks(OpenDecoder, NULL)
+vlc_module_end()
+
+static block_t *
+DecodeBlock(decoder_t *p_dec, block_t **pp_block)
+{
+    (void) p_dec;
+    if (pp_block != NULL)
+    {
+        block_t *p_block = *pp_block;
+        *pp_block = NULL;
+        return p_block;
+    }
+    else
+        return NULL;
+}
+
+static int
+OpenDecoder(vlc_object_t *p_this)
+{
+    decoder_t *p_dec = (decoder_t*)p_this;
+
+    switch (p_dec->fmt_in.i_codec)
+    {
+    case VLC_CODEC_MPGA:
+    case VLC_CODEC_MP3:
+        /* Disabled by default */
+        if (!p_dec->obj.force)
+            return VLC_EGENERIC;
+        break;
+    case VLC_CODEC_A52:
+    case VLC_CODEC_EAC3:
+    case VLC_CODEC_DTS:
+    case VLC_CODEC_SPDIFL:
+    case VLC_CODEC_SPDIFB:
+        /* Enabled by default */
+        break;
+    default:
+        return VLC_EGENERIC;
+    }
+
+    /* Set output properties */
+    p_dec->fmt_out.i_cat = AUDIO_ES;
+    p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
+    p_dec->fmt_out.audio = p_dec->fmt_in.audio;
+    p_dec->fmt_out.audio.i_format = p_dec->fmt_out.i_codec;
+
+    if (p_dec->fmt_out.audio.i_physical_channels == 0
+     || p_dec->fmt_out.audio.i_original_channels == 0
+     || p_dec->fmt_out.audio.i_bytes_per_frame == 0
+     || p_dec->fmt_out.audio.i_frame_length == 0
+     || decoder_UpdateAudioFormat(p_dec))
+    {
+        es_format_Init(&p_dec->fmt_out, UNKNOWN_ES, 0);
+        return VLC_EGENERIC;
+    }
+
+    p_dec->pf_decode_audio = DecodeBlock;
+    p_dec->pf_flush        = NULL;
+
+    return VLC_SUCCESS;
+}
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 95e8915..6d5801c 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -395,6 +395,7 @@ modules/codec/scte18.c
 modules/codec/scte18.h
 modules/codec/sdl_image.c
 modules/codec/shine.c
+modules/codec/spdif.c
 modules/codec/speex.c
 modules/codec/spudec/parse.c
 modules/codec/spudec/spudec.c
-- 
2.8.1