From 1b8e3801b2444f6e466e1b7c09cfc51605e80fb3 Mon Sep 17 00:00:00 2001
From: Frederik M J Vestre <freqmod@gmail.com>
Date: Thu, 26 Jul 2012 14:38:32 +0200
Subject: Initial opus codec support Synchronised with opus repo on github
 (https://github.com/freqmod/rockbox-opus)

Status:
* Seeking ported from speex, but fails on some cases (e.g. seek to granule 0)
* ReplayGain parsing needs to be reworked, we do vorbis-style replaygain now.
  http://wiki.xiph.org/OggOpus#Comment_Header explicitly forbids these in
  favour of R128_TRACK_GAIN tag.
* No optimisation yet, source files still nearly identical to opus upstream
* Multi-stream opus files may not be parsed correctly

Change-Id: Ia66f1027dc1d288083e3c57b2816700078376f9a
Reviewed-on: http://gerrit.rockbox.org/300
Reviewed-by: Bertrik Sikken <bertrik@sikken.nl>
Tested-by: Bertrik Sikken <bertrik@sikken.nl>
---
 lib/rbcodec/metadata/metadata.c |  3 +++
 lib/rbcodec/metadata/metadata.h |  1 +
 lib/rbcodec/metadata/ogg.c      | 14 ++++++++++++++
 lib/rbcodec/metadata/vorbis.c   | 18 +++++++++++++++++-
 4 files changed, 35 insertions(+), 1 deletion(-)

(limited to 'lib/rbcodec/metadata')

diff --git a/lib/rbcodec/metadata/metadata.c b/lib/rbcodec/metadata/metadata.c
index 668ece97cf..5caf933b55 100644
--- a/lib/rbcodec/metadata/metadata.c
+++ b/lib/rbcodec/metadata/metadata.c
@@ -233,6 +233,9 @@ const struct afmt_entry audio_formats[AFMT_NUM_CODECS] =
     /* KSS (MSX computer KSS Music File) */
     [AFMT_KSS] =
         AFMT_ENTRY("KSS", "kss", NULL, get_kss_metadata,   "kss\0"),
+    /* Opus */
+    [AFMT_OPUS] =
+        AFMT_ENTRY("Opus", "opus", NULL, get_ogg_metadata,   "opus\0"),
 #endif
 };
 
diff --git a/lib/rbcodec/metadata/metadata.h b/lib/rbcodec/metadata/metadata.h
index 4b4a8337fb..18cfce7523 100644
--- a/lib/rbcodec/metadata/metadata.h
+++ b/lib/rbcodec/metadata/metadata.h
@@ -89,6 +89,7 @@ enum
     AFMT_SGC,          /* SGC (Sega Master System, Game Gear, Coleco Vision Sound Format) */
     AFMT_VGM,         /* VGM (Video Game Music Format) */
     AFMT_KSS,          /* KSS (MSX computer KSS Music File) */
+    AFMT_OPUS,         /* Opus (see http://www.opus-codec.org ) */
 #endif
 
     /* add new formats at any index above this line to have a sensible order -
diff --git a/lib/rbcodec/metadata/ogg.c b/lib/rbcodec/metadata/ogg.c
index f3231c6f8a..5d302442ed 100644
--- a/lib/rbcodec/metadata/ogg.c
+++ b/lib/rbcodec/metadata/ogg.c
@@ -102,6 +102,20 @@ bool get_ogg_metadata(int fd, struct mp3entry* id3)
             return false;
         }
     }
+    else if (memcmp(&buf[28], "OpusHead", 8) == 0)
+    {
+        id3->codectype = AFMT_OPUS;
+        id3->frequency = 48000;
+        id3->vbr = true;
+
+// FIXME handle an actual channel mapping table
+        /* Comments are in second Ogg page (byte 108 onwards for Speex) */
+        if (lseek(fd, 47, SEEK_SET) < 0)
+        {
+            DEBUGF("Couldnotseektoogg");
+            return false;
+        }
+    }
     else
     {
         /* Unsupported format, try to print the marker, catches Ogg/FLAC at least */
diff --git a/lib/rbcodec/metadata/vorbis.c b/lib/rbcodec/metadata/vorbis.c
index d020808c56..66aa85022f 100644
--- a/lib/rbcodec/metadata/vorbis.c
+++ b/lib/rbcodec/metadata/vorbis.c
@@ -250,7 +250,7 @@ static bool file_init(struct file* file, int fd, int type, int remaining)
     memset(file, 0, sizeof(*file));
     file->fd = fd;
     
-    if (type == AFMT_OGG_VORBIS || type == AFMT_SPEEX)
+    if (type == AFMT_OGG_VORBIS || type == AFMT_SPEEX || type == AFMT_OPUS)
     {
         if (!file_read_page_header(file))
         {
@@ -276,6 +276,22 @@ static bool file_init(struct file* file, int fd, int type, int remaining)
             return false;
         }
     }
+    else if (type == AFMT_OPUS)
+    {
+        char buffer[8];
+
+        /* Read comment header */
+        if (file_read(file, buffer, sizeof(buffer)) < (ssize_t) sizeof(buffer))
+        {
+            return false;
+        }
+
+        /* Should be equal to "OpusTags" */
+        if (memcmp(buffer, "OpusTags", 8) != 0)
+        {
+            return false;
+        }
+    }
     else if (type == AFMT_FLAC)
     {
         file->packet_remaining = remaining;
-- 
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