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Added proper metadata parsing for musepack files, including ReplayGain.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7752 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2005-11-04 21:34:03 +00:00
parent 9ccca4a1b6
commit e642c90afb
1 changed files with 66 additions and 0 deletions
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66
apps/metadata.c
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@ -1254,6 +1254,69 @@ static bool get_m4a_metadata(int fd, struct mp3entry* id3)
return true;
}
static bool get_musepack_metadata(int fd, struct mp3entry *id3)
{
const int32_t sfreqs_sv7[4] = { 44100, 48000, 37800, 32000 };
uint32_t header[8];
uint64_t samples = 0;
unsigned i;
/* TODO: libmpcdec skips id3v2 header, perhaps we should as well */
if (read(fd, header, 4*8) != 4*8) return false;
/* Musepack files are little endian, might need swapping */
for (i = 1; i < 8; i++)
header[i] = letoh32(header[i]);
if (!memcmp(header, "MP+", 3)) { /* Compare to sig "MP+" */
unsigned int streamversion;
header[0] = letoh32(header[0]);
streamversion = (header[0] >> 24) & 15;
if (streamversion >= 8) {
return false; /* SV8 or higher don't exist yet, so no support */
} else if (streamversion == 7) {
unsigned int gapless = (header[5] >> 31) & 0x0001;
unsigned int last_frame_samples = (header[5] >> 20) & 0x07ff;
int track_gain, album_gain;
unsigned int bufused;
id3->frequency = sfreqs_sv7[(header[2] >> 16) & 0x0003];
samples = (uint64_t)header[1]*1152; /* 1152 is mpc frame size */
if (gapless)
samples -= 1152 - last_frame_samples;
else
samples -= 481; /* Musepack subband synth filter delay */
/* Extract ReplayGain data from header */
track_gain = (int16_t)((header[3] >> 16) & 0xffff);
id3->track_gain = get_replaygain_int(track_gain);
id3->track_peak = ((uint16_t)(header[3] & 0xffff)) << 9;
album_gain = (int16_t)((header[4] >> 16) & 0xffff);
id3->album_gain = get_replaygain_int(album_gain);
id3->album_peak = ((uint16_t)(header[4] & 0xffff)) << 9;
/* Write replaygain values to strings for use in id3 screen */
id3->track_gain_string = id3->id3v2buf;
bufused = snprintf(id3->track_gain_string, sizeof(id3->id3v2buf),
"%d.%d dB", track_gain/100, abs(track_gain)%100);
id3->album_gain_string = id3->id3v2buf + bufused + 1;
bufused = snprintf(id3->album_gain_string, 100,
"%d.%d dB", album_gain/100, abs(album_gain)%100);
}
} else {
/* There's no certain way to detect these pre-sv7 streams, apparently */
/* TODO: add sv6 parsing here */
return false;
}
/* Estimate bitrate, we should probably subtract the various header sizes
here for super-accurate results */
id3->length = samples/id3->frequency*1000;
id3->filesize = filesize(fd);
id3->bitrate = id3->filesize*8/id3->length;
return true;
}
/* Simple file type probing by looking at the filename extension. */
unsigned int probe_file_format(const char *filename)
{
@ -1313,8 +1376,11 @@ bool get_metadata(struct track_info* track, int fd, const char* trackname,
break;
case AFMT_MPC:
if (!get_musepack_metadata(fd, &(track->id3)))
return false;
read_ape_tags(fd, &(track->id3));
break;
case AFMT_OGG_VORBIS:
if (!get_vorbis_metadata(fd, &(track->id3)))
{