New ID3 and MP3 stream parser, plus not-yet-ready Xing header generation code

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3410 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 71 insertions, 5 deletions

diff --git a/firmware/export/id3.h b/firmware/export/id3.h
index 55ce002..30be4bf 100644
--- a/firmware/export/id3.h
+++ b/firmware/export/id3.h
@@ -39,15 +39,18 @@ struct mp3entry {
     unsigned int first_frame_offset; /* Byte offset to first real MP3 frame.
                                         Used for skipping leading garbage to
                                         avoid gaps between tracks. */
+    unsigned int xing_header_pos;
     unsigned int filesize; /* in bytes */
     unsigned int length;   /* song length */
     unsigned int elapsed;  /* ms played */
+
+    /* MP3 stream specific info */
     long bpf;              /* bytes per frame */
     long tpf;              /* time per frame */
 
     /* Xing VBR fields */
     bool vbr;
-    unsigned char vbrflags;
+    bool has_toc;    /* True if there is a VBR header in the file */
     unsigned char toc[100];/* table of contents */
 
     /* these following two fields are used for local buffering */
@@ -59,10 +62,6 @@ struct mp3entry {
     int index;             /* playlist index */
 };
 
-#define VBR_FRAMES_FLAG 0x01
-#define VBR_BYTES_FLAG  0x02
-#define VBR_TOC_FLAG    0x04
-
 enum {
     ID3_VER_1_0 = 1,
     ID3_VER_1_1,
diff --git a/firmware/export/mp3data.h b/firmware/export/mp3data.h
new file mode 100644
index 0000000..a1018eb
--- /dev/null
+++ b/firmware/export/mp3data.h
@@ -0,0 +1,66 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef _MP3DATA_H_
+#define _MP3DATA_H_
+
+#define MPEG_VERSION2_5 0
+#define MPEG_VERSION1   1
+#define MPEG_VERSION2   2
+
+struct mp3info {
+    /* Standard MP3 frame header fields */
+    int version;
+    int layer;
+    bool protection;
+    int bitrate;
+    int frequency;
+    int padding;
+    int channel_mode;
+    int mode_extension;
+    int emphasis;
+    int frame_size; /* Frame size in bytes */
+    int frame_time; /* Frame duration in milliseconds */
+
+    bool is_vbr;     /* True if the file is VBR */
+    bool has_toc;    /* True if there is a VBR header in the file */
+    bool is_xing_vbr; /* True if the VBR header is of Xing type */
+    bool is_vbri_vbr; /* True if the VBR header is of VBRI type */
+    unsigned char toc[100];
+    int frame_count; /* Number of frames in the file (if VBR) */
+    int byte_count;  /* File size in bytes */
+    int file_time;   /* Length of the whole file in milliseconds */
+    int xing_header_pos;
+};
+
+/* Xing header information */
+#define VBR_FRAMES_FLAG 0x01
+#define VBR_BYTES_FLAG  0x02
+#define VBR_TOC_FLAG    0x04
+
+
+unsigned long find_next_frame(int fd, int *offset, int max_offset, unsigned long last_header);
+int get_mp3file_info(int fd, struct mp3info *info);
+int count_mp3_frames(int fd, int startpos, int filesize,
+                     void (*progressfunc)(int));
+int create_xing_header(int fd, int startpos, int filesize,
+                       unsigned char *buf, int num_frames,
+                       void (*progressfunc)(int));
+
+#endif
diff --git a/firmware/export/mpeg.h b/firmware/export/mpeg.h
index 6b44363..9ce03da 100644
--- a/firmware/export/mpeg.h
+++ b/firmware/export/mpeg.h
@@ -90,6 +90,7 @@ unsigned long mpeg_num_recorded_bytes(void);
 #endif
 void mpeg_get_debugdata(struct mpeg_debug *dbgdata);
 void mpeg_set_buffer_margin(int seconds);
+int mpeg_create_xing_header(char *filename, void (*progressfunc)(int));
 
 #define SOUND_VOLUME 0
 #define SOUND_BASS 1