update on wma decoder

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@41 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/stm32_radio/asf.c

+#include <rtthread.h>
+#include <dfs_posix.h>
+#include "libwma/asf.h"
+
+#define DEBUGF rt_kprintf
+
+/* always little endian */
+#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)
+
+/* TODO: Just read the GUIDs into a 16-byte array, and use memcmp to compare */
+struct guid_s {
+    rt_uint32_t v1;
+    rt_uint16_t v2;
+    rt_uint16_t v3;
+    rt_uint8_t  v4[8];
+};
+typedef struct guid_s guid_t;
+typedef long long rt_uint64_t;
+
+struct asf_object_s {
+    guid_t       	guid;
+    rt_uint64_t     size;
+    rt_uint64_t     datalen;
+};
+typedef struct asf_object_s asf_object_t;
+
+enum asf_error_e {
+    ASF_ERROR_INTERNAL       = -1,  /* incorrect input to API calls */
+    ASF_ERROR_OUTOFMEM       = -2,  /* some malloc inside program failed */
+    ASF_ERROR_EOF            = -3,  /* unexpected end of file */
+    ASF_ERROR_IO             = -4,  /* error reading or writing to file */
+    ASF_ERROR_INVALID_LENGTH = -5,  /* length value conflict in input data */
+    ASF_ERROR_INVALID_VALUE  = -6,  /* other value conflict in input data */
+    ASF_ERROR_INVALID_OBJECT = -7,  /* ASF object missing or in wrong place */
+    ASF_ERROR_OBJECT_SIZE    = -8,  /* invalid ASF object size (too small) */
+    ASF_ERROR_SEEKABLE       = -9,  /* file not seekable */
+    ASF_ERROR_SEEK           = -10, /* file is seekable but seeking failed */
+    ASF_ERROR_ENCRYPTED      = -11  /* file is encrypted */
+};
+
+static const guid_t asf_guid_null =
+{0x00000000, 0x0000, 0x0000, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}};
+
+/* top level object guids */
+
+static const guid_t asf_guid_header =
+{0x75B22630, 0x668E, 0x11CF, {0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C}};
+
+static const guid_t asf_guid_data =
+{0x75B22636, 0x668E, 0x11CF, {0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C}};
+
+static const guid_t asf_guid_index =
+{0x33000890, 0xE5B1, 0x11CF, {0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB}};
+
+/* header level object guids */
+
+static const guid_t asf_guid_file_properties =
+{0x8cabdca1, 0xa947, 0x11cf, {0x8E, 0xe4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65}};
+
+static const guid_t asf_guid_stream_properties =
+{0xB7DC0791, 0xA9B7, 0x11CF, {0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65}};
+
+static const guid_t asf_guid_content_description =
+{0x75B22633, 0x668E, 0x11CF, {0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C}};
+
+static const guid_t asf_guid_extended_content_description =
+{0xD2D0A440, 0xE307, 0x11D2, {0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50}};
+
+static const guid_t asf_guid_content_encryption =
+{0x2211b3fb, 0xbd23, 0x11d2, {0xb4, 0xb7, 0x00, 0xa0, 0xc9, 0x55, 0xfc, 0x6e}};
+
+static const guid_t asf_guid_extended_content_encryption =
+{0x298ae614, 0x2622, 0x4c17, {0xb9, 0x35, 0xda, 0xe0, 0x7e, 0xe9, 0x28, 0x9c}};
+
+/* stream type guids */
+
+static const guid_t asf_guid_stream_type_audio =
+{0xF8699E40, 0x5B4D, 0x11CF, {0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B}};
+
+static int asf_guid_match(const guid_t *guid1, const guid_t *guid2)
+{
+    if((guid1->v1 != guid2->v1) ||
+       (guid1->v2 != guid2->v2) ||
+       (guid1->v3 != guid2->v3) ||
+       (rt_memcmp(guid1->v4, guid2->v4, 8)))
+	{
+        return 0;
+    }
+
+    return 1;
+}
+
+/* Read the 16 byte GUID from a file */
+static void asf_readGUID(int fd, guid_t* guid)
+{
+    read_uint32le(fd, &guid->v1);
+    read_uint16le(fd, &guid->v2);
+    read_uint16le(fd, &guid->v3);
+    read(fd, guid->v4, 8);
+}
+
+static void asf_read_object_header(asf_object_t *obj, int fd)
+{
+    asf_readGUID(fd, &obj->guid);
+    read_uint64le(fd, &obj->size);
+    obj->datalen = 0;
+}
+
+/* Parse an integer from the extended content object - we always
+   convert to an int, regardless of native format.
+*/
+static int asf_intdecode(int fd, int type, int length)
+{
+    rt_uint16_t tmp16;
+    rt_uint32_t tmp32;
+    rt_uint64_t tmp64;
+
+    if (type==3) {
+        read_uint32le(fd, &tmp32);
+        lseek(fd,length - 4,SEEK_CUR);
+        return (int)tmp32;
+    } else if (type==4) {
+        read_uint64le(fd, &tmp64);
+        lseek(fd,length - 8,SEEK_CUR);
+        return (int)tmp64;
+    } else if (type == 5) {
+        read_uint16le(fd, &tmp16);
+        lseek(fd,length - 2,SEEK_CUR);
+        return (int)tmp16;
+    }
+
+    return 0;
+}
+
+/* Decode a LE utf16 string from a disk buffer into a fixed-sized
+   utf8 buffer.
+*/
+static void asf_utf16LEdecode(int fd,
+	rt_uint16_t utf16bytes,
+	unsigned char **utf8,
+	int* utf8bytes)
+{
+    unsigned long ucs;
+    int n;
+    unsigned char utf16buf[256];
+    unsigned char* utf16 = utf16buf;
+    unsigned char* newutf8;
+
+    n = read(fd, utf16buf, MIN(sizeof(utf16buf), utf16bytes));
+    utf16bytes -= n;
+
+    while (n > 0) {
+        /* Check for a surrogate pair */
+        if (utf16[1] >= 0xD8 && utf16[1] < 0xE0) {
+            if (n < 4) {
+                /* Run out of utf16 bytes, read some more */
+                utf16buf[0] = utf16[0];
+                utf16buf[1] = utf16[1];
+
+                n = read(fd, utf16buf + 2, MIN(sizeof(utf16buf)-2, utf16bytes));
+                utf16 = utf16buf;
+                utf16bytes -= n;
+                n += 2;
+            }
+
+            if (n < 4) {
+                /* Truncated utf16 string, abort */
+                break;
+            }
+            ucs = 0x10000 + ((utf16[0] << 10) | ((utf16[1] - 0xD8) << 18)
+                             | utf16[2] | ((utf16[3] - 0xDC) << 8));
+            utf16 += 4;
+            n -= 4;
+        } else {
+            ucs = (utf16[0] | (utf16[1] << 8));
+            utf16 += 2;
+            n -= 2;
+        }
+
+        if (*utf8bytes > 6) {
+            newutf8 = utf8encode(ucs, *utf8);
+            *utf8bytes -= (newutf8 - *utf8);
+            *utf8 += (newutf8 - *utf8);
+        }
+
+        /* We have run out of utf16 bytes, read more if available */
+        if ((n == 0) && (utf16bytes > 0)) {
+            n = read(fd, utf16buf, MIN(sizeof(utf16buf), utf16bytes));
+            utf16 = utf16buf;
+            utf16bytes -= n;
+        }
+    }
+
+    *utf8[0] = 0;
+    --*utf8bytes;
+
+    if (utf16bytes > 0) {
+        /* Skip any remaining bytes */
+        lseek(fd, utf16bytes, SEEK_CUR);
+    }
+    return;
+}
+
+static int asf_parse_header(int fd, struct mp3entry* id3,
+                                    asf_waveformatex_t* wfx)
+{
+    asf_object_t current;
+    asf_object_t header;
+    rt_uint64_t datalen;
+    int i;
+    int fileprop = 0;
+    rt_uint64_t play_duration;
+    rt_uint16_t flags;
+    rt_uint32_t subobjects;
+    rt_uint8_t utf8buf[512];
+    int id3buf_remaining = sizeof(id3->id3v2buf) + sizeof(id3->id3v1buf);
+    unsigned char* id3buf = (unsigned char*)id3->id3v2buf;
+
+    asf_read_object_header((asf_object_t *) &header, fd);
+
+    //DEBUGF("header.size=%d\n",(int)header.size);
+    if (header.size < 30) {
+        /* invalid size for header object */
+        return ASF_ERROR_OBJECT_SIZE;
+    }
+
+    read_uint32le(fd, &subobjects);
+
+    /* Two reserved bytes - do we need to read them? */
+    lseek(fd, 2, SEEK_CUR);
+
+    //DEBUGF("Read header - size=%d, subobjects=%d\n",(int)header.size, (int)subobjects);
+
+    if (subobjects > 0) {
+        header.datalen = header.size - 30;
+
+        /* TODO: Check that we have datalen bytes left in the file */
+        datalen = header.datalen;
+
+        for (i=0; i<(int)subobjects; i++) {
+            //DEBUGF("Parsing header object %d - datalen=%d\n",i,(int)datalen);
+            if (datalen < 24) {
+                //DEBUGF("not enough data for reading object\n");
+                break;
+            }
+
+            asf_read_object_header(&current, fd);
+
+            if (current.size > datalen || current.size < 24) {
+                //DEBUGF("invalid object size - current.size=%d, datalen=%d\n",(int)current.size,(int)datalen);
+                break;
+            }
+
+            if (asf_guid_match(&current.guid, &asf_guid_file_properties)) {
+                    if (current.size < 104)
+                        return ASF_ERROR_OBJECT_SIZE;
+
+                    if (fileprop) {
+                        /* multiple file properties objects not allowed */
+                        return ASF_ERROR_INVALID_OBJECT;
+                    }
+
+                    fileprop = 1;
+                    /* All we want is the play duration - uint64_t at offset 40 */
+                    lseek(fd, 40, SEEK_CUR);
+
+                    read_uint64le(fd, &play_duration);
+                    id3->length = play_duration / 10000;
+
+                    //DEBUGF("****** length = %lums\n", id3->length);
+
+                    /* Read the packet size - uint32_t at offset 68 */
+                    lseek(fd, 20, SEEK_CUR);
+                    read_uint32le(fd, &wfx->packet_size);
+
+                    /* Skip bytes remaining in object */
+                    lseek(fd, current.size - 24 - 72, SEEK_CUR);
+            } else if (asf_guid_match(&current.guid, &asf_guid_stream_properties)) {
+                    guid_t guid;
+                    rt_uint32_t propdatalen;
+
+                    if (current.size < 78)
+                        return ASF_ERROR_OBJECT_SIZE;
+
+                    asf_readGUID(fd, &guid);
+
+                    lseek(fd, 24, SEEK_CUR);
+                    read_uint32le(fd, &propdatalen);
+                    lseek(fd, 4, SEEK_CUR);
+                    read_uint16le(fd, &flags);
+
+                    if (!asf_guid_match(&guid, &asf_guid_stream_type_audio)) {
+                        //DEBUGF("Found stream properties for non audio stream, skipping\n");
+                        lseek(fd,current.size - 24 - 50,SEEK_CUR);
+                    } else if (wfx->audiostream == -1) {
+                        lseek(fd, 4, SEEK_CUR);
+                        //DEBUGF("Found stream properties for audio stream %d\n",flags&0x7f);
+
+                        if (propdatalen < 18) {
+                            return ASF_ERROR_INVALID_LENGTH;
+                        }
+
+                        read_uint16le(fd, &wfx->codec_id);
+                        read_uint16le(fd, &wfx->channels);
+                        read_uint32le(fd, &wfx->rate);
+                        read_uint32le(fd, &wfx->bitrate);
+                        wfx->bitrate *= 8;
+                        read_uint16le(fd, &wfx->blockalign);
+                        read_uint16le(fd, &wfx->bitspersample);
+                        read_uint16le(fd, &wfx->datalen);
+
+                        /* Round bitrate to the nearest kbit */
+                        id3->bitrate = (wfx->bitrate + 500) / 1000;
+                        id3->frequency = wfx->rate;
+
+                        if (wfx->codec_id == ASF_CODEC_ID_WMAV1) {
+                            read(fd, wfx->data, 4);
+                            lseek(fd,current.size - 24 - 72 - 4,SEEK_CUR);
+                            wfx->audiostream = flags&0x7f;
+                        } else if (wfx->codec_id == ASF_CODEC_ID_WMAV2) {
+                            read(fd, wfx->data, 6);
+                            lseek(fd,current.size - 24 - 72 - 6,SEEK_CUR);
+                            wfx->audiostream = flags&0x7f;
+                        } else {
+                            DEBUGF("Unsupported WMA codec (Pro, Lossless, Voice, etc)\n");
+                            lseek(fd,current.size - 24 - 72,SEEK_CUR);
+                        }
+
+                    }
+            } else if (asf_guid_match(&current.guid, &asf_guid_content_description)) {
+                    /* Object contains five 16-bit string lengths, followed by the five strings:
+                       title, artist, copyright, description, rating
+                     */
+                    rt_uint16_t strlength[5];
+                    int i;
+
+                    //DEBUGF("Found GUID_CONTENT_DESCRIPTION - size=%d\n",(int)(current.size - 24));
+
+                    /* Read the 5 string lengths - number of bytes included trailing zero */
+                    for (i=0; i<5; i++) {
+                        read_uint16le(fd, &strlength[i]);
+                        //DEBUGF("strlength = %u\n",strlength[i]);
+                    }
+
+                    if (strlength[0] > 0) {  /* 0 - Title */
+                        id3->title = id3buf;
+                        asf_utf16LEdecode(fd, strlength[0], &id3buf, &id3buf_remaining);
+                    }
+
+                    if (strlength[1] > 0) {  /* 1 - Artist */
+                        id3->artist = id3buf;
+                        asf_utf16LEdecode(fd, strlength[1], &id3buf, &id3buf_remaining);
+                    }
+
+                    lseek(fd, strlength[2], SEEK_CUR); /* 2 - copyright */
+
+                    if (strlength[3] > 0) {  /* 3 - description */
+                        id3->comment = id3buf;
+                        asf_utf16LEdecode(fd, strlength[3], &id3buf, &id3buf_remaining);
+                    }
+
+                    lseek(fd, strlength[4], SEEK_CUR); /* 4 - rating */
+            } else if (asf_guid_match(&current.guid, &asf_guid_extended_content_description)) {
+                    rt_uint16_t count;
+                    int i;
+                    int bytesleft = current.size - 24;
+                    //DEBUGF("Found GUID_EXTENDED_CONTENT_DESCRIPTION\n");
+
+                    read_uint16le(fd, &count);
+                    bytesleft -= 2;
+                    //DEBUGF("extended metadata count = %u\n",count);
+
+                    for (i=0; i < count; i++) {
+                        rt_uint16_t length, type;
+                        unsigned char* utf8 = utf8buf;
+                        int utf8length = 512;
+
+                        read_uint16le(fd, &length);
+                        asf_utf16LEdecode(fd, length, &utf8, &utf8length);
+                        bytesleft -= 2 + length;
+
+                        read_uint16le(fd, &type);
+                        read_uint16le(fd, &length);
+
+                        if (!strcmp("WM/TrackNumber",utf8buf)) {
+                            if (type == 0) {
+                                id3->track_string = id3buf;
+                                asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                                id3->tracknum = atoi(id3->track_string);
+                            } else if ((type >=2) && (type <= 5)) {
+                                id3->tracknum = asf_intdecode(fd, type, length);
+                            } else {
+                                lseek(fd, length, SEEK_CUR);
+                            }
+                        } else if ((!strcmp("WM/Genre",utf8buf)) && (type == 0)) {
+                            id3->genre_string = id3buf;
+                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                        } else if ((!strcmp("WM/AlbumTitle",utf8buf)) && (type == 0)) {
+                            id3->album = id3buf;
+                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                        } else if ((!strcmp("WM/AlbumArtist",utf8buf)) && (type == 0)) {
+                            id3->albumartist = id3buf;
+                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                        } else if ((!strcmp("WM/Composer",utf8buf)) && (type == 0)) {
+                            id3->composer = id3buf;
+                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                        } else if (!strcmp("WM/Year",utf8buf)) {
+                            if (type == 0) {
+                                id3->year_string = id3buf;
+                                asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                                id3->year = atoi(id3->year_string);
+                            } else if ((type >=2) && (type <= 5)) {
+                                id3->year = asf_intdecode(fd, type, length);
+                            } else {
+                                lseek(fd, length, SEEK_CUR);
+                            }
+                        } else if (!strncmp("replaygain_", utf8buf, 11)) {
+                            char* value = id3buf;
+                            int buf_len = id3buf_remaining;
+                            int len;
+                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                            len = parse_replaygain(utf8buf, value, id3, 
+                                value, buf_len);
+                            
+                            if (len == 0) {
+                                /* Don't need to keep the value */
+                                id3buf = value;
+                                id3buf_remaining = buf_len;
+                            }
+                        } else if (!strcmp("MusicBrainz/Track Id", utf8buf)) {
+                            id3->mb_track_id = id3buf;
+                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
+                        } else {
+                            lseek(fd, length, SEEK_CUR);
+                        }
+                        bytesleft -= 4 + length;
+                    }
+
+                    lseek(fd, bytesleft, SEEK_CUR);
+            } else if (asf_guid_match(&current.guid, &asf_guid_content_encryption)
+                || asf_guid_match(&current.guid, &asf_guid_extended_content_encryption)) {
+                //DEBUGF("File is encrypted\n");
+                return ASF_ERROR_ENCRYPTED;
+            } else {
+                //DEBUGF("Skipping %d bytes of object\n",(int)(current.size - 24));
+                lseek(fd,current.size - 24,SEEK_CUR);
+            }
+
+            //DEBUGF("Parsed object - size = %d\n",(int)current.size);
+            datalen -= current.size;
+        }
+
+        if (i != (int)subobjects || datalen != 0) {
+            //DEBUGF("header data doesn't match given subobject count\n");
+            return ASF_ERROR_INVALID_VALUE;
+        }
+
+        //DEBUGF("%d subobjects read successfully\n", i);
+    }
+
+    //DEBUGF("header validated correctly\n");
+
+    return 0;
+}
+
+static off_t filesize(int fd)
+{
+    struct dfs_stat buf;
+
+    stat(fd,&buf);
+    return buf.st_size;
+}
+
+rt_bool_t get_asf_metadata(int fd, struct mp3entry* id3)
+{
+    int res;
+    asf_object_t obj;
+    asf_waveformatex_t wfx;
+
+    wfx.audiostream = -1;
+
+    res = asf_parse_header(fd, id3, &wfx);
+
+    if (res < 0) {
+        DEBUGF("ASF: parsing error - %d\n",res);
+        return RT_FALSE;
+    }
+
+    if (wfx.audiostream == -1) {
+        DEBUGF("ASF: No WMA streams found\n");
+        return RT_FALSE;
+    }
+
+    asf_read_object_header(&obj, fd);
+
+    if (!asf_guid_match(&obj.guid, &asf_guid_data)) {
+        DEBUGF("ASF: No data object found\n");
+        return RT_FALSE;
+    }
+
+    /* Store the current file position - no need to parse the header
+       again in the codec.  The +26 skips the rest of the data object
+       header.
+     */
+    id3->first_frame_offset = lseek(fd, 0, SEEK_CUR) + 26;
+    id3->filesize = filesize(fd);
+    /* We copy the wfx struct to the MP3 TOC field in the id3 struct so
+       the codec doesn't need to parse the header object again */
+    rt_memcpy(id3->toc, &wfx, sizeof(wfx));
+
+    return RT_TRUE;
+}