From c48af23c7ea13d91a3514b342bf0f6ec1fb3b5d4 Mon Sep 17 00:00:00 2001
From: Marcoen Hirschberg <marcoen@gmail.com>
Date: Tue, 6 Oct 2009 13:47:12 +0000
Subject: add gapless playback for Nero encoded AAC files

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22984 a1c6a512-1295-4272-9138-f99709370657
---
 apps/metadata/metadata_common.c | 15 +++++++++++++++
 apps/metadata/metadata_common.h |  2 ++
 apps/metadata/mp4.c             | 21 +++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/apps/metadata/metadata_common.c b/apps/metadata/metadata_common.c
index 5947098f12..318399693c 100644
--- a/apps/metadata/metadata_common.c
+++ b/apps/metadata/metadata_common.c
@@ -124,6 +124,21 @@ int read_uint32be(int fd, uint32_t* buf)
   *buf = betoh32(*buf);
   return n;
 }
+/* Read an unsigned 64-bit integer from a big-endian file. */
+int read_uint64be(int fd, uint64_t* buf)
+{
+  size_t n;
+  uint8_t data[8];
+  int i;
+
+  n = read(fd, data, 8);
+
+  for (i=0, *buf=0; i<=7; i++) {
+       *buf <<= 8;
+       *buf |= data[i];
+  }
+  return n;
+}
 #else
 /* Read unsigned integers from a little-endian file. */
 int read_uint16le(int fd, uint16_t* buf)
diff --git a/apps/metadata/metadata_common.h b/apps/metadata/metadata_common.h
index 1bfa6b09e4..f7539950e1 100644
--- a/apps/metadata/metadata_common.h
+++ b/apps/metadata/metadata_common.h
@@ -42,12 +42,14 @@ int read_uint8(int fd, uint8_t* buf);
 #ifdef ROCKBOX_BIG_ENDIAN
 #define read_uint16be(fd,buf) read((fd), (buf), 2)
 #define read_uint32be(fd,buf) read((fd), (buf), 4)
+#define read_uint64be(fd,buf) read((fd), (buf), 8)
 int read_uint16le(int fd, uint16_t* buf);
 int read_uint32le(int fd, uint32_t* buf);
 int read_uint64le(int fd, uint64_t* buf);
 #else
 int read_uint16be(int fd, uint16_t* buf);
 int read_uint32be(int fd, uint32_t* buf);
+int read_uint64be(int fd, uint64_t* buf);
 #define read_uint16le(fd,buf) read((fd), (buf), 2)
 #define read_uint32le(fd,buf) read((fd), (buf), 4)
 #define read_uint64le(fd,buf) read((fd), (buf), 8)
diff --git a/apps/metadata/mp4.c b/apps/metadata/mp4.c
index 00f0bf9d4c..a520597972 100644
--- a/apps/metadata/mp4.c
+++ b/apps/metadata/mp4.c
@@ -42,6 +42,7 @@
 #define MP4_cART MP4_ID(0xa9, 'A', 'R', 'T')
 #define MP4_cgrp MP4_ID(0xa9, 'g', 'r', 'p')
 #define MP4_cgen MP4_ID(0xa9, 'g', 'e', 'n')
+#define MP4_chpl MP4_ID('c', 'h', 'p', 'l')
 #define MP4_cnam MP4_ID(0xa9, 'n', 'a', 'm')
 #define MP4_cwrt MP4_ID(0xa9, 'w', 'r', 't')
 #define MP4_ccmt MP4_ID(0xa9, 'c', 'm', 't')
@@ -681,6 +682,26 @@ static bool read_mp4_container(int fd, struct mp3entry* id3,
             id3->filesize = size;
             break;
 
+        case MP4_chpl:
+            {
+                /* ADDME: add support for real chapters. Right now it's only
+                 * used for Nero's gapless hack */
+                uint8_t chapters;
+                uint64_t timestamp;
+
+                lseek(fd, 8, SEEK_CUR);
+                read_uint8(fd, &chapters);
+                size -= 9;
+
+                /* the first chapter will be used as the lead_trim */
+                if (chapters > 0) {
+                    read_uint64be(fd, &timestamp);
+                    id3->lead_trim = (timestamp * id3->frequency) / 10000000;
+                    size -= 8;
+                }
+            }
+            break;
+
         default:
             break;
         }
-- 
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