add SMAF codec (.mmf extension)(FS#10432)

This codec supports only wave data (ADPCM and PCM).
It does not support MIDI, picture, and movie.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24878 a1c6a512-1295-4272-9138-f99709370657

9 files changed, 821 insertions, 1 deletions

diff --git a/apps/SOURCES b/apps/SOURCES
index d86bb11fab..39159d639b 100644
--- a/apps/SOURCES
+++ b/apps/SOURCES
@@ -186,6 +186,7 @@ metadata/asap.c
 metadata/rm.c
 metadata/nsf.c
 metadata/oma.c
+metadata/smaf.c
 #endif
 #ifdef HAVE_TAGCACHE
 tagcache.c
diff --git a/apps/codecs/SOURCES b/apps/codecs/SOURCES
index 4c847c23e0..9787caa122 100644
--- a/apps/codecs/SOURCES
+++ b/apps/codecs/SOURCES
@@ -27,6 +27,7 @@ shorten.c
 aiff.c
 speex.c
 adx.c
+smaf.c
 #if defined(HAVE_RECORDING) && !defined(SIMULATOR)
 /* encoders */
 aiff_enc.c
diff --git a/apps/codecs/codecs.make b/apps/codecs/codecs.make
index 633f35b273..6a86517119 100644
--- a/apps/codecs/codecs.make
+++ b/apps/codecs/codecs.make
@@ -90,6 +90,7 @@ $(CODECDIR)/atrac3_rm.codec : $(CODECDIR)/libatrac.a $(CODECDIR)/librm.a
 $(CODECDIR)/atrac3_oma.codec : $(CODECDIR)/libatrac.a
 $(CODECDIR)/aiff.codec : $(CODECDIR)/libpcm.a
 $(CODECDIR)/wav.codec : $(CODECDIR)/libpcm.a
+$(CODECDIR)/smaf.codec : $(CODECDIR)/libpcm.a
 
 $(CODECS): $(CODECLIB) # this must be last in codec dependency list
 
diff --git a/apps/codecs/smaf.c b/apps/codecs/smaf.c
new file mode 100644
index 0000000000..227227ada8
--- /dev/null
+++ b/apps/codecs/smaf.c
@@ -0,0 +1,435 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (c) 2010 Yoshihisa Uchida
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "codeclib.h"
+#include "codecs/libpcm/support_formats.h"
+
+CODEC_HEADER
+
+/*
+ * SMAF (Synthetic music Mobile Application Format)
+ *
+ * References
+ * [1] YAMAHA Corporation, Synthetic music Mobile Application Format Ver.3.05, 2002
+ */
+
+enum {
+    SMAF_TRACK_CHUNK_SCORE = 0, /* Score Track */
+    SMAF_TRACK_CHUNK_AUDIO,     /* PCM Audio Track */
+};
+
+/* SMAF supported codec formats */
+enum {
+    SMAF_FORMAT_UNSUPPORT = 0,  /* unsupported format */
+    SMAF_FORMAT_SIGNED_PCM,     /* 2's complement PCM */
+    SMAF_FORMAT_UNSIGNED_PCM,   /* Offset Binary PCM */
+    SMAF_FORMAT_ADPCM,          /* YAMAHA ADPCM */
+};
+
+static int support_formats[2][3] = {
+    {SMAF_FORMAT_SIGNED_PCM, SMAF_FORMAT_UNSIGNED_PCM, SMAF_FORMAT_ADPCM     },
+    {SMAF_FORMAT_SIGNED_PCM, SMAF_FORMAT_ADPCM,        SMAF_FORMAT_UNSUPPORT },
+};
+
+static const struct pcm_entry pcm_codecs[] = {
+    { SMAF_FORMAT_SIGNED_PCM,   get_linear_pcm_codec   },
+    { SMAF_FORMAT_UNSIGNED_PCM, get_linear_pcm_codec   },
+    { SMAF_FORMAT_ADPCM,        get_yamaha_adpcm_codec },
+};
+
+#define NUM_FORMATS 3
+
+static int basebits[4] = { 4, 8, 12, 16 };
+
+#define PCM_SAMPLE_SIZE (2048*2)
+
+static int32_t samples[PCM_SAMPLE_SIZE] IBSS_ATTR;
+
+static const struct pcm_codec *get_codec(uint32_t formattag)
+{
+    int i;
+
+    for (i = 0; i < NUM_FORMATS; i++)
+    {
+        if (pcm_codecs[i].format_tag == formattag)
+        {
+            if (pcm_codecs[i].get_codec)
+                return pcm_codecs[i].get_codec();
+            return 0;
+        }
+    }
+    return 0;
+}
+
+static unsigned int get_be32(uint8_t *buf)
+{
+    return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
+}
+
+static int convert_smaf_audio_format(int track_chunk, unsigned int audio_format)
+{
+    if (audio_format > 3)
+        return SMAF_FORMAT_UNSUPPORT;
+
+    return support_formats[track_chunk][audio_format];
+}
+
+static int convert_smaf_audio_basebit(unsigned int basebit)
+{
+    if (basebit > 4)
+        return 0;
+    return basebits[basebit];
+}
+
+static bool parse_audio_track(struct pcm_format *fmt,
+                              unsigned char **stbuf, unsigned char *endbuf)
+{
+    unsigned char *buf = *stbuf;
+    int chunksize;
+
+    buf += 8;
+    fmt->channels = ((buf[2] & 0x80) >> 7) + 1;
+    fmt->formattag = convert_smaf_audio_format(SMAF_TRACK_CHUNK_AUDIO,
+                                               (buf[2] >> 4) & 0x07);
+    if (fmt->formattag == SMAF_FORMAT_UNSUPPORT)
+    {
+        DEBUGF("CODEC_ERROR: unsupport pcm data format : %d\n", (buf[2] >> 4) & 0x07);
+        return false;
+    }
+    fmt->bitspersample = convert_smaf_audio_basebit(buf[3] >> 4);
+    if (fmt->bitspersample == 0)
+    {
+        DEBUGF("CODEC_ERROR: unsupport pcm data basebit : %d\n", buf[3] >> 4);
+        return false;
+    }
+    buf += 6;
+    while (buf < endbuf)
+    {
+        chunksize = get_be32(buf + 4) + 8;
+        if (memcmp(buf, "Awa", 3) == 0)
+        {
+            fmt->numbytes = get_be32(buf + 4);
+            buf += 8;
+            return true;
+        }
+        buf += chunksize;
+    }
+    DEBUGF("CODEC_ERROR: smaf does not include stream pcm data\n");
+    return false;
+}
+
+static bool parse_score_track(struct pcm_format *fmt,
+                              unsigned char **stbuf, unsigned char *endbuf)
+{
+    unsigned char *buf = *stbuf;
+    int chunksize;
+
+    if (buf[9] != 0x00)
+    {
+        DEBUGF("CODEC_ERROR: score track chunk unsupport sequence type %d\n", buf[9]);
+        return false;
+    }
+
+    /*
+     * skip to the next chunk.
+     *    MA-2/MA-3/MA-5: padding 16 bytes
+     *    MA-7:           padding 32 bytes
+     */
+    if (buf[3] < 7)
+        buf += 28;
+    else
+        buf += 44;
+
+    while (buf < endbuf)
+    {
+        chunksize = get_be32(buf + 4) + 8;
+        if (memcmp(buf, "Mtsp", 4) == 0)
+        {
+            buf += 8;
+            if (memcmp(buf, "Mwa", 3) != 0)
+            {
+                DEBUGF("CODEC_ERROR: smaf does not include stream pcm data\n");
+                return false;
+            }
+            fmt->numbytes = get_be32(buf + 4) - 3;
+            fmt->channels = ((buf[8] & 0x80) >> 7) + 1;
+            fmt->formattag = convert_smaf_audio_format(SMAF_TRACK_CHUNK_SCORE,
+                                                       (buf[8] >> 4) & 0x07);
+            if (fmt->formattag == SMAF_FORMAT_UNSUPPORT)
+            {
+                DEBUGF("CODEC_ERROR: unsupport pcm data format : %d\n",
+                                                       (buf[8] >> 4) & 0x07);
+                return false;
+            }
+            fmt->bitspersample = convert_smaf_audio_basebit(buf[8] & 0x0f);
+            if (fmt->bitspersample == 0)
+            {
+                DEBUGF("CODEC_ERROR: unsupport pcm data basebit : %d\n",
+                                                           buf[8] & 0x0f);
+                return false;
+            }
+            buf += 11;
+            return true;
+        }
+        buf += chunksize;
+    }
+
+    DEBUGF("CODEC_ERROR: smaf does not include stream pcm data\n");
+    return false;
+}
+
+static bool parse_header(struct pcm_format *fmt, size_t *pos)
+{
+    unsigned char *buf, *stbuf, *endbuf;
+    size_t chunksize;
+
+    ci->memset(fmt, 0, sizeof(struct pcm_format));
+
+    /* assume the SMAF pcm data position is less than 1024 bytes */
+    stbuf = ci->request_buffer(&chunksize, 1024);
+    if (chunksize < 1024)
+        return false;
+
+    buf = stbuf;
+    endbuf = stbuf + chunksize;
+ 
+    if (memcmp(buf, "MMMD", 4) != 0)
+    {
+        DEBUGF("CODEC_ERROR: does not smaf format %c%c%c%c\n",
+                                  buf[0], buf[1], buf[2], buf[3]);
+        return false;
+    }
+    buf += 8;
+
+    while (buf < endbuf)
+    {
+        chunksize = get_be32(buf + 4) + 8;
+        if (memcmp(buf, "ATR", 3) == 0)
+        {
+            if (!parse_audio_track(fmt, &buf, endbuf))
+                return false;
+            break;
+        }
+        if (memcmp(buf, "MTR", 3) == 0)
+        {
+            if (!parse_score_track(fmt, &buf, endbuf))
+                return false;
+            break;
+        }
+        buf += chunksize;
+    }
+
+    if (buf >= endbuf)
+    {
+        DEBUGF("CODEC_ERROR: unsupported smaf format\n");
+        return false;
+    }
+
+    /* blockalign */
+    if (fmt->formattag == SMAF_FORMAT_SIGNED_PCM ||
+        fmt->formattag == SMAF_FORMAT_UNSIGNED_PCM)
+        fmt->blockalign = fmt->channels * fmt->bitspersample >> 3;
+
+    /* data signess (default signed) */
+    fmt->is_signed = (fmt->formattag != SMAF_FORMAT_UNSIGNED_PCM);
+
+    fmt->is_little_endian = false;
+
+    /* sets pcm data position */
+    *pos = buf - stbuf;
+
+    return true;
+}
+
+static struct pcm_format format;
+static uint32_t bytesdone;
+
+static uint8_t *read_buffer(size_t *realsize)
+{
+    uint8_t *buffer = (uint8_t *)ci->request_buffer(realsize, format.chunksize);
+    if (bytesdone + (*realsize) > format.numbytes)
+        *realsize = format.numbytes - bytesdone;
+    bytesdone += *realsize;
+    ci->advance_buffer(*realsize);
+    return buffer;
+}
+
+enum codec_status codec_main(void)
+{
+    int status = CODEC_OK;
+    uint32_t decodedsamples;
+    uint32_t i = CODEC_OK;
+    size_t n;
+    int bufcount;
+    int endofstream;
+    uint8_t *smafbuf;
+    off_t firstblockposn;     /* position of the first block in file */
+    const struct pcm_codec *codec;
+
+    /* Generic codec initialisation */
+    ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
+  
+next_track:
+    if (codec_init()) {
+        i = CODEC_ERROR;
+        goto exit;
+    }
+
+    while (!*ci->taginfo_ready && !ci->stop_codec)
+        ci->sleep(1);
+
+    codec_set_replaygain(ci->id3);
+
+    ci->memset(&format, 0, sizeof(struct pcm_format));
+    format.is_signed = true;
+    format.is_little_endian = false;
+
+    decodedsamples = 0;
+    codec = 0;
+
+    if (!parse_header(&format, &n))
+    {
+        i = CODEC_ERROR;
+        goto done;
+    }
+
+    codec = get_codec(format.formattag);
+    if (codec == 0)
+    {
+        DEBUGF("CODEC_ERROR: unsupport audio format: 0x%lx\n", format.formattag);
+        i = CODEC_ERROR;
+        goto done;
+    }
+
+    if (!codec->set_format(&format))
+    {
+        i = CODEC_ERROR;
+        goto done;
+    }
+
+    /* common format check */
+    if (format.channels == 0) {
+        DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-channels file\n");
+        status = CODEC_ERROR;
+        goto done;
+    }
+    if (format.samplesperblock == 0) {
+        DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-wSamplesPerBlock file\n");
+        status = CODEC_ERROR;
+        goto done;
+    }
+    if (format.blockalign == 0)
+    {
+        DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-blockalign file\n");
+        i = CODEC_ERROR;
+        goto done;
+    }
+    if (format.numbytes == 0) {
+        DEBUGF("CODEC_ERROR: 'data' chunk not found or has zero-length\n");
+        status = CODEC_ERROR;
+        goto done;
+    }
+
+    /* check chunksize */
+    if ((format.chunksize / format.blockalign) * format.samplesperblock * format.channels
+           > PCM_SAMPLE_SIZE)
+        format.chunksize = (PCM_SAMPLE_SIZE / format.blockalign) * format.blockalign;
+    if (format.chunksize == 0)
+    {
+        DEBUGF("CODEC_ERROR: chunksize is 0\n");
+        i = CODEC_ERROR;
+        goto done;
+    }
+
+    ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
+
+    if (format.channels == 2) {
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
+    } else if (format.channels == 1) {
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
+    } else {
+        DEBUGF("CODEC_ERROR: more than 2 channels unsupported\n");
+        i = CODEC_ERROR;
+        goto done;
+    }
+
+    firstblockposn = 1024 - n;
+    ci->advance_buffer(firstblockposn);
+
+    /* The main decoder loop */
+    bytesdone = 0;
+    ci->set_elapsed(0);
+    endofstream = 0;
+
+    while (!endofstream) {
+        ci->yield();
+        if (ci->stop_codec || ci->new_track)
+            break;
+
+        if (ci->seek_time) {
+            struct pcm_pos *newpos = codec->get_seek_pos(ci->seek_time, &read_buffer);
+
+            decodedsamples = newpos->samples;
+            if (newpos->pos > format.numbytes)
+                break;
+            if (ci->seek_buffer(firstblockposn + newpos->pos))
+            {
+                bytesdone = newpos->pos;
+            }
+            ci->seek_complete();
+        }
+        smafbuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
+
+        if (n == 0)
+            break; /* End of stream */
+
+        if (bytesdone + n > format.numbytes) {
+            n = format.numbytes - bytesdone;
+            endofstream = 1;
+        }
+
+        status = codec->decode(smafbuf, n, samples, &bufcount);
+        if (status == CODEC_ERROR)
+        {
+            DEBUGF("codec error\n");
+            goto done;
+        }
+
+        ci->pcmbuf_insert(samples, NULL, bufcount);
+
+        ci->advance_buffer(n);
+        bytesdone += n;
+        decodedsamples += bufcount;
+        if (bytesdone >= format.numbytes)
+            endofstream = 1;
+
+        ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
+    }
+    i = CODEC_OK;
+
+done:
+    if (ci->request_next_track())
+        goto next_track;
+
+exit:
+    return i;
+}
+
diff --git a/apps/filetypes.c b/apps/filetypes.c
index 49ae4afde2..17a1f0345f 100644
--- a/apps/filetypes.c
+++ b/apps/filetypes.c
@@ -101,6 +101,7 @@ static const struct filetype inbuilt_filetypes[] = {
     { "oma", FILE_ATTR_AUDIO, Icon_Audio, VOICE_EXT_MPA },
     { "aa3", FILE_ATTR_AUDIO, Icon_Audio, VOICE_EXT_MPA },
     { "at3", FILE_ATTR_AUDIO, Icon_Audio, VOICE_EXT_MPA },
+    { "mmf", FILE_ATTR_AUDIO, Icon_Audio, VOICE_EXT_MPA },
 #endif
     { "m3u", FILE_ATTR_M3U, Icon_Playlist, LANG_PLAYLIST },
     { "m3u8",FILE_ATTR_M3U, Icon_Playlist, LANG_PLAYLIST },
diff --git a/apps/metadata.c b/apps/metadata.c
index ce3a4ec22a..36e97268ea 100644
--- a/apps/metadata.c
+++ b/apps/metadata.c
@@ -165,6 +165,9 @@ const struct afmt_entry audio_formats[AFMT_NUM_CODECS] =
     /* Atrac3 in Sony OMA Container */
     [AFMT_OMA_ATRAC3] =
         AFMT_ENTRY("ATRAC3",  "atrac3_oma",     NULL,          "oma\0aa3\0"      ), 
+    /* SMAF (Synthetic music Mobile Application Format) */
+    [AFMT_SMAF] =
+        AFMT_ENTRY("SMAF",  "smaf",   NULL,          "mmf\0"      ),
 #endif
 };
 
@@ -447,6 +450,14 @@ bool get_metadata(struct mp3entry* id3, int fd, const char* trackname)
             return false;
         }
         break;
+
+    case AFMT_SMAF:
+        if (!get_smaf_metadata(fd, id3))
+        {
+            DEBUGF("get_smaf_metadata error\n");
+            return false;
+        }
+        break;
         
 #endif /* CONFIG_CODEC == SWCODEC */
         
diff --git a/apps/metadata.h b/apps/metadata.h
index bd9cd27eca..7f6843f6d9 100644
--- a/apps/metadata.h
+++ b/apps/metadata.h
@@ -78,6 +78,7 @@ enum
     AFMT_TM8,          /* Atari 8bit tm8 format */
     AFMT_TM2,          /* Atari 8bit tm2 format */
     AFMT_OMA_ATRAC3,   /* Atrac3 in Sony OMA container */
+    AFMT_SMAF,         /* SMAF */
 #endif
 
     /* add new formats at any index above this line to have a sensible order -
diff --git a/apps/metadata/metadata_parsers.h b/apps/metadata/metadata_parsers.h
index aa07101269..1e439c807b 100644
--- a/apps/metadata/metadata_parsers.h
+++ b/apps/metadata/metadata_parsers.h
@@ -42,4 +42,4 @@ bool get_asap_metadata(int fd, struct mp3entry* id3);
 bool get_rm_metadata(int fd, struct mp3entry* id3);
 bool get_nsf_metadata(int fd, struct mp3entry* id3);
 bool get_oma_metadata(int fd, struct mp3entry* id3);
-
+bool get_smaf_metadata(int fd, struct mp3entry* id3);
diff --git a/apps/metadata/smaf.c b/apps/metadata/smaf.c
new file mode 100644
index 0000000000..f7d825c96a
--- /dev/null
+++ b/apps/metadata/smaf.c
@@ -0,0 +1,369 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2010 Yoshihisa Uchida
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <inttypes.h>
+
+#include "system.h"
+#include "metadata.h"
+#include "metadata_common.h"
+#include "metadata_parsers.h"
+#include "rbunicode.h"
+#include "logf.h"
+
+static int basebits[4] = { 4, 8, 12, 16 };
+
+static int frequency[5] = { 4000, 8000, 11025, 22050, 44100 };
+
+static int support_codepages[7] = {
+    SJIS, ISO_8859_1, -1, GB_2312, BIG_5, -1, -1,
+};
+
+/* extra codepage */
+#define UCS_2  (NUM_CODEPAGES + 1)
+#define UTF_16 (NUM_CODEPAGES + 2)
+
+/* support id3 tag */
+#define TAG_TITLE    (('S'<<8)|'T')
+#define TAG_ARTIST   (('A'<<8)|'N')
+#define TAG_COMPOSER (('S'<<8)|'W')
+
+static unsigned char smafbuf[1024];
+
+static bool read_datachunk(unsigned char *src, int size, unsigned short tag,
+                           int codepage, unsigned char *dst)
+{
+    int datasize = 0;
+    unsigned char *utf8;
+
+    while(size > datasize + 4)
+    {
+        datasize = (src[2] << 8) | src[3];
+        if (tag == ((src[0] << 8) | src[1]))
+        {
+            src += 4;
+            if (codepage < NUM_CODEPAGES)
+                utf8 = iso_decode(src, dst, codepage, datasize);
+            else /* codepage == UTF_16, UCS_2 */
+                utf8 = utf16BEdecode(src, dst, datasize);
+            *utf8 = '\0';
+
+            return true;
+        }
+        src += (datasize + 4);
+    }
+    return false;
+}
+
+static bool read_option(unsigned char *src, int size, unsigned short tag,
+                        int codepage, unsigned char *dst)
+{
+    int datasize = 0;
+    unsigned char *endsrc = src + size;
+    unsigned char *utf8;
+
+    while(src < endsrc)
+    {
+        utf8 = src;
+        src += 3;
+        datasize = 0;
+        while (*src != ',' || *(src-1) == '\\')
+        {
+            datasize++;
+            src++;
+        }
+        if (tag == ((utf8[0] << 8) | utf8[1]) && utf8[2] == ':')
+        {
+            utf8 += 3;
+            if (codepage < NUM_CODEPAGES)
+                utf8 = iso_decode(utf8, dst, codepage, datasize);
+            else /* codepage == UTF_16, UCS_2 */
+                utf8 = utf16BEdecode(utf8, dst, datasize);
+            *utf8 = '\0';
+
+            return true;
+        }
+        src++;
+    }
+    return false;
+}
+
+static int convert_smaf_audio_frequency(unsigned int freq)
+{
+    if (freq > 4)
+        return 0;
+    return frequency[freq];
+}
+
+static int convert_smaf_audio_basebit(unsigned int basebit)
+{
+    if (basebit > 4)
+        return 0;
+    return basebits[basebit];
+}
+
+static int convert_smaf_codetype(unsigned int codetype)
+{
+    if (codetype < 7)
+        return support_codepages[codetype];
+    else if (codetype < 0x20)
+        return -1;
+    else if (codetype == 0x20)
+        return UCS_2;
+    else if (codetype == 0x23)
+        return UTF_8;
+    else if (codetype == 0x24)
+        return UTF_16;
+    else if (codetype == 0xff)
+        return ISO_8859_1;
+    return -1;
+}
+
+static bool get_smaf_metadata_audio_track(struct mp3entry *id3,
+                                          unsigned char* buf, unsigned char *endbuf)
+{
+    int bitspersample;
+    int channels;
+    int chunksize;
+    long numbytes;
+    unsigned long totalsamples;
+
+    channels = ((buf[10] & 0x80) >> 7) + 1;
+    bitspersample = convert_smaf_audio_basebit(buf[11] >> 4);
+    if (bitspersample == 0)
+    {
+        DEBUGF("metada error: smaf unsupport basebit %d\n", buf[11] >> 4);
+        return false;
+    }
+    id3->frequency = convert_smaf_audio_frequency(buf[10] & 0x0f);
+
+    buf += 14;
+    while (buf < endbuf)
+    {
+        chunksize = get_long_be(buf + 4) + 8;
+        if (memcmp(buf, "Awa", 3) == 0)
+        {
+            numbytes = get_long_be(buf + 4) - 3;
+            totalsamples = (numbytes << 3) / (bitspersample * channels);
+
+            /* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
+            id3->length = ((int64_t)totalsamples * 1000LL) / id3->frequency;
+
+            return true;
+        }
+        buf += chunksize;
+    }
+    DEBUGF("metada error: smaf does not include pcm audio data\n");
+    return false;
+}
+
+static bool get_smaf_metadata_score_track(struct mp3entry *id3,
+                                          unsigned char* buf, unsigned char *endbuf)
+{
+    int bitspersample;
+    int channels;
+    int chunksize;
+    long numbytes;
+    unsigned long totalsamples;
+
+    /*
+     * skip to the next chunk.
+     *    MA-2/MA-3/MA-5: padding 16 bytes
+     *    MA-7:           padding 32 bytes
+     */
+    if (buf[3] < 7)
+        buf += 28;
+    else
+        buf += 44;
+
+    while (buf + 10 < endbuf)
+    {
+        chunksize = get_long_be(buf + 4) + 8;
+        if (memcmp(buf, "Mtsp", 4) == 0)
+        {
+            buf += 8;
+            if (memcmp(buf, "Mwa", 3) != 0)
+            {
+                DEBUGF("metada error: smaf unsupport format: %c%c%c%c\n",
+                       buf[0], buf[1], buf[2], buf[3]);
+                return false;
+            }
+
+            channels = ((buf[8] & 0x80) >> 7) + 1;
+            bitspersample = convert_smaf_audio_basebit(buf[8] & 0x0f);
+            if (bitspersample == 0)
+            {
+                DEBUGF("metada error: smaf unsupport basebit %d\n", buf[8] & 0x0f);
+                return false;
+            }
+
+            numbytes = get_long_be(buf + 4) - 3;
+            totalsamples = numbytes * 8 / (bitspersample * channels);
+
+            id3->frequency = (buf[9] << 8) | buf[10];
+
+            /* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
+            id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
+
+            return true;
+        }
+        buf += chunksize;
+    }
+    DEBUGF("metada error: smaf does not include pcm audio data\n");
+    return false;
+}
+
+bool get_smaf_metadata(int fd, struct mp3entry* id3)
+{
+    /* Use the trackname part of the id3 structure as a temporary buffer */
+    unsigned char* buf = (unsigned char *)id3->path;
+    unsigned char *endbuf = smafbuf + 1024;
+    int i;
+    int contents_size;
+    int codepage = ISO_8859_1;
+
+    id3->title = NULL;
+    id3->artist = NULL;
+    id3->composer = NULL;
+
+    id3->vbr = false;   /* All SMAF files are CBR */
+    id3->filesize = filesize(fd);
+
+    /* get RIFF chunk header */
+    if ((lseek(fd, 0, SEEK_SET) < 0) || (read(fd, buf, 21) < 21))
+    {
+        return false;
+    }
+
+    if ((memcmp(buf, "MMMD", 4) != 0) || (memcmp(&buf[8], "CNTI", 4) != 0))
+    {
+        DEBUGF("metada error: does not smaf format\n");
+        return false;
+    }
+
+    contents_size = get_long_be(buf + 12);
+    if (contents_size < 5)
+    {
+        DEBUGF("metada error: CNTI chunk size is small %d\n", contents_size);
+        return false;
+    }
+
+    contents_size -= 5;
+    i = contents_size;
+    if (i == 0)
+    {
+        read(fd, buf, 16);
+        if (memcmp(buf, "OPDA", 4) != 0)
+        {
+            DEBUGF("metada error: smaf does not include OPDA chunk\n");
+            return false;
+        }
+        contents_size = get_long_be(buf + 4) - 8;
+
+        if (memcmp(buf + 8, "Dch", 3) != 0)
+        {
+            DEBUGF("metada error: smaf does not include Dch chunk\n");
+            return false;
+        }
+        codepage = convert_smaf_codetype(buf[11]);
+        if (codepage < 0)
+        {
+            DEBUGF("metada error: smaf unsupport codetype: %d\n", buf[11]);
+            return false;
+        }
+
+        i = get_long_be(buf + 12);
+
+        if (i > MAX_PATH)
+        {
+            DEBUGF("metada warning: smaf contents size is big %d\n", i);
+            i = MAX_PATH;
+        }
+        if (read(fd, buf, i) < i)
+            return false;
+
+        /* title */
+        if (read_datachunk(buf, i, TAG_TITLE, codepage, id3->id3v1buf[0]))
+            id3->title = id3->id3v1buf[0];
+
+        /* artist */
+        if (read_datachunk(buf, i, TAG_ARTIST, codepage, id3->id3v1buf[1]))
+            id3->artist = id3->id3v1buf[1];
+
+        /* composer */
+        if (read_datachunk(buf, i, TAG_COMPOSER, codepage, id3->id3v1buf[2]))
+            id3->composer = id3->id3v1buf[2];
+    }
+    else
+    {
+        codepage = convert_smaf_codetype(buf[14]);
+        if (codepage < 0)
+        {
+            DEBUGF("metada error: smaf unsupport codetype: %d\n", buf[11]);
+            return false;
+        }
+
+        if (i > MAX_PATH)
+        {
+            DEBUGF("metada warning: smaf contents size is big %d\n", i);
+            i = MAX_PATH;
+        }
+        if (read(fd, buf, i) < i)
+            return false;
+
+        /* title */
+        if (read_option(buf, i, TAG_TITLE, codepage, id3->id3v1buf[0]))
+            id3->title = id3->id3v1buf[0];
+
+        /* artist */
+        if (read_option(buf, i, TAG_ARTIST, codepage, id3->id3v1buf[1]))
+            id3->artist = id3->id3v1buf[1];
+
+        /* composer */
+        if (read_option(buf, i, TAG_COMPOSER, codepage, id3->id3v1buf[2]))
+            id3->composer = id3->id3v1buf[2];
+    }
+
+    if (contents_size > i)
+        lseek(fd, contents_size - i, SEEK_CUR);
+
+    /* assume the SMAF pcm data position is less than 1024 bytes */
+    if (read(fd, smafbuf, 1024) < 1024)
+        return false;
+
+    buf = smafbuf;
+    while (buf + 8 < endbuf)
+    {
+        i = get_long_be(buf + 4) + 8;
+
+        if (memcmp(buf, "ATR", 3) == 0)
+            return get_smaf_metadata_audio_track(id3, buf, endbuf);
+        else if (memcmp(buf, "MTR", 3) == 0)
+            return get_smaf_metadata_score_track(id3, buf, endbuf);
+
+        buf += i;
+    }
+
+    DEBUGF("metada error: smaf does not include track chunk\n");
+    return false;
+}