/* Called on the first frame decoded. Returns true if this frame
* should be ignored. */
bool RageSoundReader_MP3::handle_first_frame()
{
bool ret = false;
/* Check for a XING tag. */
xing_init( &mad->xingtag );
if( xing_parse(&mad->xingtag, mad->Stream.anc_ptr, mad->Stream.anc_bitlen) == 0 )
{
/*
* "Info" tags are written by some tools. They're just Xing tags, but for
* CBR files.
*
* However, DWI's decoder, BASS, doesn't understand this, and treats it as a
* corrupt frame, outputting a frame of silence. Let's ignore the tag, so
* it'll be treated as an invalid frame, so we match DWI sync.
*
* The information in it isn't very useful to us. The TOC is less accurate
* then computing it ourself (low resolution). The file length computation
* might be wrong, if the tag is incorrect, and we can compute that accurately
* ourself for CBR files.
*/
if( mad->xingtag.type == xing::INFO )
return false;
mad->header_bytes = max( mad->header_bytes, get_this_frame_byte(mad) );
mad->has_xing = true;
mad_timer_t tm = mad->Frame.header.duration;
/* XXX: does this include the Xing header itself? */
mad_timer_multiply( &tm, mad->xingtag.frames );
mad->length = mad_timer_count( tm, MAD_UNITS_MILLISECONDS );
/* XXX: an id3v2 footer tag would throw this off a little. This also assumes
* the Xing tag is the last header; it always is, I think. */
int bytes = mad->filesize - mad->header_bytes;
mad->bitrate = (int)(bytes * 8 / (mad->length/1000.f));
if( mad->xingtag.type == xing::XING )
ret = 1;
}
/* If there's no Xing tag, mad->length will be filled in by _open. */
return ret;
}
/* Do a seek based on the bitrate. */
int RageSoundReader_MP3::SetPosition_estimate( int iFrame )
{
/* This doesn't leave us accurate. */
mad->timer_accurate = 0;
mad_timer_t seekamt;
mad_timer_set( &seekamt, 0, iFrame, mad->Frame.header.samplerate );
{
/* We're going to skip ahead two samples below, so seek earlier than
* we were asked to. */
mad_timer_t back_len = mad->framelength;
mad_timer_multiply(&back_len, -2);
mad_timer_add(&seekamt, back_len);
if( mad_timer_compare(seekamt, mad_timer_zero) < 0 )
seekamt = mad_timer_zero;
}
int seekpos = mad_timer_count( seekamt, MAD_UNITS_MILLISECONDS ) * (mad->bitrate / 8 / 1000);
seekpos += mad->header_bytes;
seek_stream_to_byte( seekpos );
/* We've jumped across the file, so the decoder is currently desynced.
* Don't use resync(); it's slow. Just decode a few frames. */
for( int i = 0; i < 2; ++i )
{
int ret = do_mad_frame_decode();
if( ret <= 0 )
return ret;
}
/* Throw out one synth. */
synth_output();
mad->outleft = 0;
/* Find out where we really seeked to. */
int ms = (get_this_frame_byte(mad) - mad->header_bytes) / (mad->bitrate / 8 / 1000);
mad_timer_set(&mad->Timer, 0, ms, 1000);
return 1;
}
static gboolean
xmms_mad_init (xmms_xform_t *xform)
{
struct mad_frame frame;
struct mad_stream stream;
xmms_error_t err;
guchar buf[40960];
xmms_mad_data_t *data;
int len;
const gchar *metakey;
g_return_val_if_fail (xform, FALSE);
data = g_new0 (xmms_mad_data_t, 1);
mad_stream_init (&data->stream);
mad_frame_init (&data->frame);
mad_synth_init (&data->synth);
xmms_xform_private_data_set (xform, data);
data->buffer_length = 0;
data->synthpos = 0x7fffffff;
mad_stream_init (&stream);
mad_frame_init (&frame);
len = xmms_xform_peek (xform, buf, 40960, &err);
mad_stream_buffer (&stream, buf, len);
while (mad_frame_decode (&frame, &stream) == -1) {
if (!MAD_RECOVERABLE (stream.error)) {
XMMS_DBG ("couldn't decode %02x %02x %02x %02x",buf[0],buf[1],buf[2],buf[3]);
mad_frame_finish (&frame);
mad_stream_finish (&stream);
return FALSE;
}
}
data->channels = frame.header.mode == MAD_MODE_SINGLE_CHANNEL ? 1 : 2;
data->samplerate = frame.header.samplerate;
if (frame.header.flags & MAD_FLAG_PROTECTION) {
XMMS_DBG ("Frame has protection enabled");
if (stream.anc_ptr.byte > stream.buffer + 2) {
stream.anc_ptr.byte = stream.anc_ptr.byte - 2;
}
}
data->samples_to_play = -1;
data->xing = xmms_xing_parse (stream.anc_ptr);
if (data->xing) {
xmms_xing_lame_t *lame;
XMMS_DBG ("File with Xing header!");
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_IS_VBR;
xmms_xform_metadata_set_int (xform, metakey, 1);
if (xmms_xing_has_flag (data->xing, XMMS_XING_FRAMES)) {
guint duration;
mad_timer_t timer;
timer = frame.header.duration;
mad_timer_multiply (&timer, xmms_xing_get_frames (data->xing));
duration = mad_timer_count (timer, MAD_UNITS_MILLISECONDS);
XMMS_DBG ("XING duration %d", duration);
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_DURATION;
xmms_xform_metadata_set_int (xform, metakey, duration);
if (xmms_xing_has_flag (data->xing, XMMS_XING_BYTES) && duration) {
guint tmp;
tmp = xmms_xing_get_bytes (data->xing) * ((guint64)8000) / duration;
XMMS_DBG ("XING bitrate %d", tmp);
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_BITRATE;
xmms_xform_metadata_set_int (xform, metakey, tmp);
}
}
lame = xmms_xing_get_lame (data->xing);
if (lame) {
/* FIXME: add a check for ignore_lame_headers from the medialib */
data->frames_to_skip = 1;
data->samples_to_skip = lame->start_delay;
data->samples_to_play = ((guint64) xmms_xing_get_frames (data->xing) * 1152ULL) -
lame->start_delay - lame->end_padding;
XMMS_DBG ("Samples to skip in the beginning: %d, total: %" G_GINT64_FORMAT,
data->samples_to_skip, data->samples_to_play);
/*
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_GAIN_ALBUM;
xmms_xform_metadata_set_int (xform, metakey, lame->audiophile_gain);
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_PEAK_TRACK;
xmms_xform_metadata_set_int (xform, metakey, lame->peak_amplitude);
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_GAIN_TRACK;
xmms_xform_metadata_set_int (xform, metakey, lame->radio_gain);
*/
}
} else {
gint filesize;
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_BITRATE;
xmms_xform_metadata_set_int (xform, metakey, frame.header.bitrate);
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_DURATION;
if (!xmms_xform_metadata_get_int (xform, metakey, &filesize)) {
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_SIZE;
if (xmms_xform_metadata_get_int (xform, metakey, &filesize)) {
gint32 val;
val = (gint32) (filesize * (gdouble) 8000.0 / frame.header.bitrate);
metakey = XMMS_MEDIALIB_ENTRY_PROPERTY_DURATION;
xmms_xform_metadata_set_int (xform, metakey, val);
}
}
}
/* seeking needs bitrate */
data->bitrate = frame.header.bitrate;
if (xmms_id3v1_get_tags (xform) < 0) {
mad_stream_finish (&data->stream);
mad_frame_finish (&data->frame);
mad_synth_finish (&data->synth);
if (data->xing) {
xmms_xing_free (data->xing);
}
return FALSE;
}
xmms_xform_outdata_type_add (xform,
XMMS_STREAM_TYPE_MIMETYPE,
"audio/pcm",
XMMS_STREAM_TYPE_FMT_FORMAT,
XMMS_SAMPLE_FORMAT_S16,
XMMS_STREAM_TYPE_FMT_CHANNELS,
data->channels,
XMMS_STREAM_TYPE_FMT_SAMPLERATE,
data->samplerate,
XMMS_STREAM_TYPE_END);
mad_frame_finish (&frame);
mad_stream_finish (&stream);
return TRUE;
}
/* Following two functions are adapted from mad_timer, from the
libmad distribution */
void scan(void const *ptr, ssize_t len, buffer *buf)
{
struct mad_stream stream;
struct mad_header header;
struct xing xing;
unsigned long bitrate = 0;
int has_xing = 0;
int is_vbr = 0;
mad_stream_init(&stream);
mad_header_init(&header);
mad_stream_buffer(&stream, ptr, len);
buf->num_frames = 0;
/* There are three ways of calculating the length of an mp3:
1) Constant bitrate: One frame can provide the information
needed: # of frames and duration. Just see how long it
is and do the division.
2) Variable bitrate: Xing tag. It provides the number of
frames. Each frame has the same number of samples, so
just use that.
3) All: Count up the frames and duration of each frames
by decoding each one. We do this if we've no other
choice, i.e. if it's a VBR file with no Xing tag.
*/
while (1)
{
if (mad_header_decode(&header, &stream) == -1)
{
if (MAD_RECOVERABLE(stream.error))
continue;
else
break;
}
/* Limit xing testing to the first frame header */
if (!buf->num_frames++)
{
if(parse_xing(&xing, stream.anc_ptr, stream.anc_bitlen))
{
is_vbr = 1;
if (xing.flags & XING_FRAMES)
{
/* We use the Xing tag only for frames. If it doesn't have that
information, it's useless to us and we have to treat it as a
normal VBR file */
has_xing = 1;
buf->num_frames = xing.frames;
break;
}
}
}
/* Test the first n frames to see if this is a VBR file */
if (!is_vbr && !(buf->num_frames > 20))
{
if (bitrate && header.bitrate != bitrate)
{
is_vbr = 1;
}
else
{
bitrate = header.bitrate;
}
}
/* We have to assume it's not a VBR file if it hasn't already been
marked as one and we've checked n frames for different bitrates */
else if (!is_vbr)
{
break;
}
mad_timer_add(&buf->duration, header.duration);
}
if (!is_vbr)
{
double time = (len * 8.0) / (header.bitrate); /* time in seconds */
double timefrac = (double)time - ((long)(time));
long nsamples = 32 * MAD_NSBSAMPLES(&header); /* samples per frame */
/* samplerate is a constant */
buf->num_frames = (long) (time * header.samplerate / nsamples);
mad_timer_set(&buf->duration, (long)time, (long)(timefrac*100), 100);
}
else if (has_xing)
{
/* modify header.duration since we don't need it anymore */
mad_timer_multiply(&header.duration, buf->num_frames);
buf->duration = header.duration;
}
else
{
/* the durations have been added up, and the number of frames
counted. We do nothing here. */
}
mad_header_finish(&header);
mad_stream_finish(&stream);
}
static bool
mp3_decode_first_frame(struct mp3_data *data, struct tag **tag,
struct replay_gain_info **replay_gain_info_r)
{
struct xing xing;
struct lame lame;
struct mad_bitptr ptr;
int bitlen;
enum mp3_action ret;
/* stfu gcc */
memset(&xing, 0, sizeof(struct xing));
xing.flags = 0;
while (true) {
do {
ret = decode_next_frame_header(data, tag,
replay_gain_info_r);
} while (ret == DECODE_CONT);
if (ret == DECODE_BREAK)
return false;
if (ret == DECODE_SKIP) continue;
do {
ret = decodeNextFrame(data);
} while (ret == DECODE_CONT);
if (ret == DECODE_BREAK)
return false;
if (ret == DECODE_OK) break;
}
ptr = data->stream.anc_ptr;
bitlen = data->stream.anc_bitlen;
mp3_filesize_to_song_length(data);
/*
* if an xing tag exists, use that!
*/
if (parse_xing(&xing, &ptr, &bitlen)) {
data->found_xing = true;
data->mute_frame = MUTEFRAME_SKIP;
if ((xing.flags & XING_FRAMES) && xing.frames) {
mad_timer_t duration = data->frame.header.duration;
mad_timer_multiply(&duration, xing.frames);
data->total_time = ((float)mad_timer_count(duration, MAD_UNITS_MILLISECONDS)) / 1000;
data->max_frames = xing.frames;
}
if (parse_lame(&lame, &ptr, &bitlen)) {
if (gapless_playback &&
data->input_stream->seekable) {
data->drop_start_samples = lame.encoder_delay +
DECODERDELAY;
data->drop_end_samples = lame.encoder_padding;
}
/* Album gain isn't currently used. See comment in
* parse_lame() for details. -- jat */
if (replay_gain_info_r && !*replay_gain_info_r &&
lame.track_gain) {
*replay_gain_info_r = replay_gain_info_new();
(*replay_gain_info_r)->tuples[REPLAY_GAIN_TRACK].gain = lame.track_gain;
(*replay_gain_info_r)->tuples[REPLAY_GAIN_TRACK].peak = lame.peak;
}
}
}
if (!data->max_frames)
return false;
if (data->max_frames > 8 * 1024 * 1024) {
g_warning("mp3 file header indicates too many frames: %lu\n",
data->max_frames);
return false;
}
data->frame_offsets = g_malloc(sizeof(long) * data->max_frames);
data->times = g_malloc(sizeof(mad_timer_t) * data->max_frames);
return true;
}
//Get info on file:
//Uso LibMad per calcolare la durata del pezzo perché
//altrimenti dovrei gestire il buffer anche nella seekNextFrame (senza è troppo lenta).
//E' una porcheria ma è più semplice. :)
int MP3MEgetInfo(){
unsigned long FrameCount = 0;
int fd = -1;
int bufferSize = 1024*496;
u8 *localBuffer;
long singleDataRed = 0;
struct mad_stream stream;
struct mad_header header;
int timeFromID3 = 0;
float mediumBitrate = 0.0f;
int has_xing = 0;
struct xing xing;
memset(&xing, 0, sizeof(xing));
if (!MP3ME_tagRead)
getMP3METagInfo(MP3ME_fileName, &MP3ME_info);
mad_stream_init (&stream);
mad_header_init (&header);
fd = sceIoOpen(MP3ME_fileName, PSP_O_RDONLY, 0777);
if (fd < 0)
return -1;
long size = sceIoLseek(fd, 0, PSP_SEEK_END);
sceIoLseek(fd, 0, PSP_SEEK_SET);
MP3ME_tagsize = ID3v2TagSize(MP3ME_fileName);
double startPos = MP3ME_tagsize;
sceIoLseek32(fd, startPos, PSP_SEEK_SET);
//Check for xing frame:
unsigned char *xing_buffer;
xing_buffer = (unsigned char *)malloc(XING_BUFFER_SIZE);
if (xing_buffer != NULL)
{
sceIoRead(fd, xing_buffer, XING_BUFFER_SIZE);
if(parse_xing(xing_buffer, 0, &xing))
{
if (xing.flags & XING_FRAMES && xing.frames){
has_xing = 1;
bufferSize = 50 * 1024;
}
}
free(xing_buffer);
xing_buffer = NULL;
}
size -= startPos;
if (size < bufferSize * 3)
bufferSize = size;
localBuffer = (unsigned char *) malloc(sizeof(unsigned char) * bufferSize);
unsigned char *buff = localBuffer;
MP3ME_info.fileType = MP3_TYPE;
MP3ME_info.defaultCPUClock = MP3ME_defaultCPUClock;
MP3ME_info.needsME = 1;
MP3ME_info.fileSize = size;
MP3ME_filesize = size;
MP3ME_info.framesDecoded = 0;
double totalBitrate = 0;
int i = 0;
for (i=0; i<3; i++){
memset(localBuffer, 0, bufferSize);
singleDataRed = sceIoRead(fd, localBuffer, bufferSize);
mad_stream_buffer (&stream, localBuffer, singleDataRed);
while (1){
if (mad_header_decode (&header, &stream) == -1){
if (stream.buffer == NULL || stream.error == MAD_ERROR_BUFLEN)
break;
else if (MAD_RECOVERABLE(stream.error)){
continue;
}else{
break;
}
}
//Informazioni solo dal primo frame:
if (FrameCount++ == 0){
switch (header.layer) {
case MAD_LAYER_I:
strcpy(MP3ME_info.layer,"I");
break;
case MAD_LAYER_II:
strcpy(MP3ME_info.layer,"II");
break;
case MAD_LAYER_III:
strcpy(MP3ME_info.layer,"III");
break;
default:
strcpy(MP3ME_info.layer,"unknown");
break;
}
MP3ME_info.kbit = header.bitrate / 1000;
MP3ME_info.instantBitrate = header.bitrate;
MP3ME_info.hz = header.samplerate;
switch (header.mode) {
case MAD_MODE_SINGLE_CHANNEL:
strcpy(MP3ME_info.mode, "single channel");
break;
case MAD_MODE_DUAL_CHANNEL:
strcpy(MP3ME_info.mode, "dual channel");
break;
case MAD_MODE_JOINT_STEREO:
strcpy(MP3ME_info.mode, "joint (MS/intensity) stereo");
break;
case MAD_MODE_STEREO:
strcpy(MP3ME_info.mode, "normal LR stereo");
break;
default:
strcpy(MP3ME_info.mode, "unknown");
break;
}
switch (header.emphasis) {
case MAD_EMPHASIS_NONE:
strcpy(MP3ME_info.emphasis,"no");
break;
case MAD_EMPHASIS_50_15_US:
strcpy(MP3ME_info.emphasis,"50/15 us");
break;
case MAD_EMPHASIS_CCITT_J_17:
strcpy(MP3ME_info.emphasis,"CCITT J.17");
break;
case MAD_EMPHASIS_RESERVED:
strcpy(MP3ME_info.emphasis,"reserved(!)");
break;
default:
strcpy(MP3ME_info.emphasis,"unknown");
break;
}
//Check if lenght found in tag info:
if (MP3ME_info.length > 0){
timeFromID3 = 1;
break;
}
if (has_xing)
break;
}
totalBitrate += header.bitrate;
}
if (size == bufferSize)
break;
else if (i==0)
sceIoLseek(fd, startPos + size/3, PSP_SEEK_SET);
else if (i==1)
sceIoLseek(fd, startPos + 2 * size/3, PSP_SEEK_SET);
if (timeFromID3 || has_xing)
break;
}
mad_header_finish (&header);
mad_stream_finish (&stream);
if (buff){
free(buff);
buff = NULL;
}
sceIoClose(fd);
int secs = 0;
if (has_xing)
{
/* modify header.duration since we don't need it anymore */
mad_timer_multiply(&header.duration, xing.frames);
secs = mad_timer_count(header.duration, MAD_UNITS_SECONDS);
MP3ME_info.length = secs;
}
else if (!MP3ME_info.length){
mediumBitrate = totalBitrate / (float)FrameCount;
secs = size * 8 / mediumBitrate;
MP3ME_info.length = secs;
}else{
secs = MP3ME_info.length;
}
//Formatto in stringa la durata totale:
int h = secs / 3600;
int m = (secs - h * 3600) / 60;
int s = secs - h * 3600 - m * 60;
snprintf(MP3ME_info.strLength, sizeof(MP3ME_info.strLength), "%2.2i:%2.2i:%2.2i", h, m, s);
return 0;
}
int
mp3_get_tag (Private * h, char *path, struct SongDBEntry *e)
{
FILE *fd;
mp3Private *mp3_priv = (mp3Private *) h;
int length = 0;
long size = 0;
char *empty = strdup ("");
char *title = NULL, *artist = NULL, *album = NULL;
char *comment = NULL, *year = NULL, *genre = NULL;
if( h == NULL || path == NULL || e ==NULL)
return ERROR_INVALID_ARG;
{
struct id3_file *id3file;
struct id3_tag *id3tag;
id3_ucs4_t *ucs4;
id3_latin1_t *latin1;
struct id3_frame *frame;
id3file = id3_file_open ( path, ID3_FILE_MODE_READONLY);
if (id3file == NULL)
{
ERROR("get_tag: Error opening file: %s", strerror (errno));
return -1;
}
id3tag = id3_file_tag (id3file);
frame = id3_tag_findframe (id3tag, ID3_FRAME_TITLE, 0);
if (frame != NULL)
{
ucs4 =
(id3_ucs4_t *) id3_field_getstrings ((union id3_field const *)
&frame->fields[1], 0);
if (ucs4 != NULL)
{
latin1 = id3_ucs4_latin1duplicate (ucs4);
if (latin1 != NULL)
{
title = strdup (latin1);
}
}
}
frame = id3_tag_findframe (id3tag, ID3_FRAME_ARTIST, 0);
if (frame != NULL)
{
ucs4 = (id3_ucs4_t *) id3_field_getstrings (&frame->fields[1], 0);
if (ucs4 != NULL)
{
latin1 = id3_ucs4_latin1duplicate (ucs4);
if (latin1 != NULL)
{
artist = strdup (latin1);
}
}
}
frame =
id3_tag_findframe ((struct id3_tag const *) id3tag, ID3_FRAME_ALBUM, 0);
if (frame != NULL)
{
ucs4 = (id3_ucs4_t *) id3_field_getstrings (&frame->fields[1], 0);
if (ucs4 != NULL)
{
latin1 = id3_ucs4_latin1duplicate (ucs4);
if (latin1 != NULL)
{
album = strdup (latin1);
}
}
}
frame =
id3_tag_findframe ((struct id3_tag const *) id3tag, ID3_FRAME_COMMENT,
0);
if (frame != NULL)
{
ucs4 = (id3_ucs4_t *) id3_field_getstrings (&frame->fields[1], 0);
if (ucs4 != NULL)
{
latin1 = id3_ucs4_latin1duplicate (ucs4);
if (latin1 != NULL)
{
comment = strdup (latin1);
}
}
}
frame =
id3_tag_findframe ((struct id3_tag const *) id3tag, ID3_FRAME_YEAR, 0);
if (frame != NULL)
{
ucs4 = (id3_ucs4_t *) id3_field_getstrings (&frame->fields[1], 0);
if (ucs4 != NULL)
{
latin1 = id3_ucs4_latin1duplicate (ucs4);
if (latin1 != NULL)
{
year = strdup (latin1);
}
}
}
frame =
id3_tag_findframe ((struct id3_tag const *) id3tag, ID3_FRAME_GENRE, 0);
if (frame != NULL)
{
ucs4 = (id3_ucs4_t *) id3_field_getstrings (&frame->fields[1], 0);
if (ucs4 != NULL)
{
ucs4 = (id3_ucs4_t *) id3_genre_name (ucs4);
if (ucs4 != NULL)
{
latin1 = id3_ucs4_latin1duplicate (ucs4);
if (latin1 != NULL)
{
genre = strdup (latin1);
}
}
}
}
id3_file_close (id3file);
}
e->title = title;
e->artist = artist;
e->album = album;
e->comment = comment;
e->year = year;
e->genre = genre;
/* length calculation stuff */
{
struct mad_header header;
struct xing xing;
if( e->AddInfo == NULL )
{
e->AddInfo = malloc( sizeof(struct SongAddInfo) );
if( e->AddInfo == NULL)
return ERROR_NO_MEMORY;
memset( e->AddInfo, 0, sizeof( struct SongAddInfo ));
}
fd = fopen ( path, "rb");
if (fd == NULL)
{
ERROR("get_tag: Error opening file %s:%s", path, strerror (errno));
return ERROR_OPEN_ERROR;
}
fseek(fd,0,SEEK_END);
size=ftell(fd);
fseek(fd,0,SEEK_SET);
e->filesize = size;
if (scan_header (fd, &header, &xing) == -1)
{
fclose (fd);
// printf ("get_tag: Error Reading File\n");
return ERROR_READ_SEEK_ERROR;
}
switch( header.layer )
{
case MAD_LAYER_I: e->AddInfo->type = str_mpeg1_l1; break;
case MAD_LAYER_II: e->AddInfo->type = str_mpeg1_l2; break;
case MAD_LAYER_III:
if( header.flags & MAD_FLAG_MPEG_2_5_EXT )
e->AddInfo->type = str_mpeg25_l3;
else
e->AddInfo->type = str_mpeg1_l3;
break;
default: e->AddInfo->type = NULL; break;
}
e->AddInfo->n_ch = MAD_NCHANNELS(&header);
e->AddInfo->SampleRate = header.samplerate;
e->AddInfo->bitrate = header.bitrate;
e->AddInfo->err_protection = ((header.flags & MAD_FLAG_PROTECTION) >0);
e->AddInfo->copyright = ((header.flags & MAD_FLAG_COPYRIGHT) >0);
e->AddInfo->original = ((header.flags & MAD_FLAG_ORIGINAL) >0);
fseek (fd, 0, SEEK_SET);
// bitrate = 0;
if (xing.flags & XING_FRAMES)
{
mad_timer_t timer;
timer = header.duration;
mad_timer_multiply (&timer, xing.frames);
length = mad_timer_count (timer, MAD_UNITS_MILLISECONDS);
/*
if (xing.flags & XING_BYTES)
bitrate = xing.bytes * 8 / length;
*/
// printf ("XING header w/ XING_FRAMES found. length = %d\n", length);
}
else
{
if (!cfg->lengthcalc)
length = (size * 8 / (header.bitrate / 1000)); /* est. */
else
{
fseek (fd, 0, SEEK_SET);
scan_file (fd, &length, NULL);
}
}
e->time = length;
mp3_priv->length = length;
}
fclose (fd);
mp3_priv->size = size;
mp3_priv->position = 0;
return 1;
}
static int count_time_internal (struct mp3_data *data)
{
struct xing xing;
unsigned long bitrate = 0;
int has_xing = 0;
int is_vbr = 0;
int num_frames = 0;
mad_timer_t duration = mad_timer_zero;
struct mad_header header;
int good_header = 0; /* Have we decoded any header? */
mad_header_init (&header);
xing_init (&xing);
/* There are three ways of calculating the length of an mp3:
1) Constant bitrate: One frame can provide the information
needed: # of frames and duration. Just see how long it
is and do the division.
2) Variable bitrate: Xing tag. It provides the number of
frames. Each frame has the same number of samples, so
just use that.
3) All: Count up the frames and duration of each frames
by decoding each one. We do this if we've no other
choice, i.e. if it's a VBR file with no Xing tag.
*/
while (1) {
/* Fill the input buffer if needed */
if (data->stream.buffer == NULL ||
data->stream.error == MAD_ERROR_BUFLEN) {
if (!fill_buff(data))
break;
}
if (mad_header_decode(&header, &data->stream) == -1) {
if (MAD_RECOVERABLE(data->stream.error))
continue;
else if (data->stream.error == MAD_ERROR_BUFLEN)
continue;
else {
debug ("Can't decode header: %s",
mad_stream_errorstr(
&data->stream));
break;
}
}
good_header = 1;
/* Limit xing testing to the first frame header */
if (!num_frames++) {
if (xing_parse(&xing, data->stream.anc_ptr,
data->stream.anc_bitlen)
!= -1) {
is_vbr = 1;
debug ("Has XING header");
if (xing.flags & XING_FRAMES) {
has_xing = 1;
num_frames = xing.frames;
break;
}
debug ("XING header doesn't contain number of "
"frames.");
}
}
/* Test the first n frames to see if this is a VBR file */
if (!is_vbr && !(num_frames > 20)) {
if (bitrate && header.bitrate != bitrate) {
debug ("Detected VBR after %d frames",
num_frames);
is_vbr = 1;
}
else
bitrate = header.bitrate;
}
/* We have to assume it's not a VBR file if it hasn't already
* been marked as one and we've checked n frames for different
* bitrates */
else if (!is_vbr) {
debug ("Fixed rate MP3");
break;
}
mad_timer_add (&duration, header.duration);
}
if (!good_header)
return -1;
if (!is_vbr) {
/* time in seconds */
double time = (data->size * 8.0) / (header.bitrate);
double timefrac = (double)time - ((long)(time));
/* samples per frame */
long nsamples = 32 * MAD_NSBSAMPLES(&header);
/* samplerate is a constant */
num_frames = (long) (time * header.samplerate / nsamples);
/* the average bitrate is the constant bitrate */
data->avg_bitrate = bitrate;
mad_timer_set(&duration, (long)time, (long)(timefrac*100),
100);
}
else if (has_xing) {
mad_timer_multiply (&header.duration, num_frames);
duration = header.duration;
}
else {
/* the durations have been added up, and the number of frames
counted. We do nothing here. */
debug ("Counted duration by counting frames durations in "
"VBR file.");
}
if (data->avg_bitrate == -1
&& mad_timer_count(duration, MAD_UNITS_SECONDS) > 0) {
data->avg_bitrate = data->size
/ mad_timer_count(duration, MAD_UNITS_SECONDS) * 8;
}
mad_header_finish(&header);
debug ("MP3 time: %ld", mad_timer_count (duration, MAD_UNITS_SECONDS));
return mad_timer_count (duration, MAD_UNITS_SECONDS);
}
int64 MadDecoder::getDurationMs(unsigned char* buffer, size_t bufferSize)
{
struct mad_stream madStream;
struct mad_frame madFrame;
struct mad_header madHeader;
mad_timer_t time = mad_timer_zero;
bool depadded = false;
bool vbr = false;
size_t tagsize = 0;
size_t consumed = 0;
size_t numFrames = 0;
size_t initialBitrate = 0;
mad_stream_init(&madStream);
mad_header_init(&madHeader);
mad_frame_init(&madFrame);
do // Read data from the MP3 file
{
int padding = 0;
size_t leftover = madStream.bufend - madStream.next_frame;
memcpy(buffer, madStream.this_frame, leftover);
int bytesRead = fread(buffer + leftover, (size_t)1, bufferSize - leftover, handle_);
if (bytesRead <= 0) {
break;
}
for (; !depadded && padding < bytesRead && !buffer[padding]; ++padding);
depadded = true;
mad_stream_buffer(&madStream, buffer + padding, leftover + bytesRead - padding);
while (true) // decode frame headers
{
madStream.error = MAD_ERROR_NONE;
if (mad_header_decode(&madHeader, &madStream) == -1)
{
if (madStream.error == MAD_ERROR_BUFLEN) // Normal behaviour; get some more data from the file
break;
if (MAD_RECOVERABLE(madStream.error) == 0)
break;
if (madStream.error == MAD_ERROR_LOSTSYNC)
{
unsigned available = (madStream.bufend - madStream.this_frame);
tagsize = getId3TagSize(madStream.this_frame, (size_t)available);
if (tagsize) // It's some ID3 tags, so just skip
{
if (tagsize >= available) {
_fseeki64(handle_, (int64)(tagsize - available), SEEK_CUR);
depadded = false;
}
mad_stream_skip(&madStream, std::min(tagsize, available));
}
}
continue; // not an audio frame
}
mad_timer_add(&time, madHeader.duration);
consumed += madStream.next_frame - madStream.this_frame;
if (numFrames == 0) {
initialBitrate = madHeader.bitrate;
// Get the precise frame count from the XING header if present
madFrame.header = madHeader;
if (mad_frame_decode(&madFrame, &madStream) == -1)
{
if (MAD_RECOVERABLE(madStream.error) == 0) {
break;
}
}
if ((numFrames = xingFrames(madStream.anc_ptr, madStream.anc_bitlen)))
{
mad_timer_multiply(&time, (signed long)numFrames);
break;
}
}
else {
vbr |= madHeader.bitrate != initialBitrate;
}
// If not VBR, we can time just a few frames then extrapolate (not exact!)
if (++numFrames == 25 && !vbr)
{
struct stat st;
fstat(fileno(handle_), &st);
timerMultiply(&time, (double)(st.st_size - tagsize) / consumed);
break;
}
} // while(true)
} while (madStream.error == MAD_ERROR_BUFLEN);
mad_frame_finish(&madFrame);
mad_header_finish(&madHeader);
mad_stream_finish(&madStream);
rewind(handle_);
return mad_timer_count(time, MAD_UNITS_MILLISECONDS);
}