mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-29 05:01:23 +00:00
Code Issues 1 Projects Releases Wiki Activity

tag: id3v2: Read replay gain tags

Browse source 
Original commit message from CVS:
* gst-libs/gst/tag/id3v2frames.c: (id3demux_id3v2_parse_frame),
(parse_id_string), (parse_unique_file_identifier),
(parse_relative_volume_adjustment_two), (id3v2_tag_to_taglist):
Read replay gain tags (#323721).
This commit is contained in:
Tim-Philipp Müller 2006-03-16 13:22:28 +00:00 committed by Tim-Philipp Müller
parent d8900f72b5
commit 84cc22cacc
1 changed files with 108 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

116
gst-libs/gst/tag/id3v2frames.c
View file

@ -41,6 +41,7 @@ static gchar *parse_user_text_identification_frame (ID3TagsWorking * work,
const gchar ** tag_name);
static gchar *parse_unique_file_identifier (ID3TagsWorking * work,
const gchar ** tag_name);
static gboolean parse_relative_volume_adjustment_two (ID3TagsWorking * work);
static gboolean id3v2_tag_to_taglist (ID3TagsWorking * work,
const gchar * tag_name, const gchar * tag_str);
/* Parse a single string into an array of gchar* */
@ -90,6 +91,7 @@ id3demux_id3v2_parse_frame (ID3TagsWorking * work)
tag_name = gst_tag_from_id3_tag (work->frame_id);
if (tag_name == NULL &&
strncmp (work->frame_id, "RVA2", 4) != 0 &&
strncmp (work->frame_id, "TXXX", 4) != 0 &&
strncmp (work->frame_id, "UFID", 4) != 0) {
return FALSE;
@ -156,6 +158,7 @@ id3demux_id3v2_parse_frame (ID3TagsWorking * work)
/* Attached picture */
} else if (!strcmp (work->frame_id, "RVA2")) {
/* Relative volume */
result = parse_relative_volume_adjustment_two (work);
} else if (!strcmp (work->frame_id, "UFID")) {
/* Unique file identifier */
tag_str = parse_unique_file_identifier (work, &tag_name);
@ -305,16 +308,14 @@ parse_user_text_identification_frame (ID3TagsWorking * work,
return ret;
}
static gchar *
parse_unique_file_identifier (ID3TagsWorking * work, const gchar ** tag_name)
static gboolean
parse_id_string (ID3TagsWorking * work, gchar ** p_str, gint * p_len,
gint * p_datalen)
{
gint len, datalen;
gchar *owner_id, *data, *ret = NULL;
if (work->parse_size < 2)
return NULL;
GST_LOG ("parsing UFID frame of size %d", work->parse_size);
return FALSE;
for (len = 0; len < work->parse_size - 1; ++len) {
if (work->parse_data[len] == '\0')
@ -322,10 +323,27 @@ parse_unique_file_identifier (ID3TagsWorking * work, const gchar ** tag_name)
}
datalen = work->parse_size - (len + 1);
if (datalen <= 0)
if (len == 0 || datalen <= 0)
return FALSE;
*p_str = g_strndup ((gchar *) work->parse_data, len);
*p_len = len;
*p_datalen = datalen;
return TRUE;
}
static gchar *
parse_unique_file_identifier (ID3TagsWorking * work, const gchar ** tag_name)
{
gint len, datalen;
gchar *owner_id, *data, *ret = NULL;
GST_LOG ("parsing UFID frame of size %d", work->parse_size);
if (!parse_id_string (work, &owner_id, &len, &datalen))
return NULL;
owner_id = g_strndup ((gchar *) work->parse_data, len);
data = (gchar *) work->parse_data + len + 1;
GST_LOG ("UFID owner ID: %s (+ %d bytes of data)", owner_id, datalen);
@ -341,6 +359,81 @@ parse_unique_file_identifier (ID3TagsWorking * work, const gchar ** tag_name)
return ret;
}
static gboolean
parse_relative_volume_adjustment_two (ID3TagsWorking * work)
{
const gchar *gain_tag_name = NULL;
const gchar *peak_tag_name = NULL;
gdouble gain_dB, peak_val;
guint64 peak;
guint8 *data, chan, peak_bits;
gchar *id;
gint len, datalen, i;
if (!parse_id_string (work, &id, &len, &datalen))
return FALSE;
if (datalen < (1 + 2 + 1)) {
GST_WARNING ("broken RVA2 frame, data size only %d bytes", datalen);
g_free (id);
return FALSE;
}
data = work->parse_data + len + 1;
chan = GST_READ_UINT8 (data);
gain_dB = (gdouble) ((gint16) GST_READ_UINT16_BE (data + 1)) / 512.0;
/* The meaning of the peak value is not defined in the ID3v2 spec. However,
* the first/only implementation of this seems to have been in XMMS, and
* other libs (like mutagen) seem to follow that implementation as well:
* see http://bugs.xmms.org/attachment.cgi?id=113&action=view */
peak_bits = GST_READ_UINT8 (data + 1 + 2);
if (peak_bits > 64) {
GST_WARNING ("silly peak precision of %d bits, ignoring", (gint) peak_bits);
peak_bits = 0;
}
data += 1 + 2 + 1;
datalen -= 1 + 2 + 1;
if (peak_bits == 16) {
peak = GST_READ_UINT16_BE (data);
} else {
peak = 0;
for (i = 0; i < (GST_ROUND_UP_8 (peak_bits) / 8) && datalen > 0; ++i) {
peak = peak << 8;
peak |= GST_READ_UINT8 (data);
++data;
--datalen;
}
}
peak = peak << (64 - GST_ROUND_UP_8 (peak_bits));
peak_val = (gdouble) peak / gst_util_guint64_to_gdouble (G_MAXINT64);
GST_LOG ("RVA2 frame: id=%s, chan=%u, adj=%.2fdB, peak_bits=%u, peak=%.2f",
id, chan, gain_dB, (guint) peak_bits, peak_val);
if (strcmp (id, "track") == 0) {
gain_tag_name = GST_TAG_TRACK_GAIN;
peak_tag_name = GST_TAG_TRACK_PEAK;
} else if (strcmp (id, "album") == 0) {
gain_tag_name = GST_TAG_ALBUM_GAIN;
peak_tag_name = GST_TAG_ALBUM_PEAK;
} else {
GST_INFO ("Unhandled RVA2 frame id '%s'", id);
}
if (gain_tag_name) {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
gain_tag_name, gain_dB, NULL);
}
if (peak_tag_name && peak_bits > 0) {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
peak_tag_name, peak_val, NULL);
}
g_free (id);
return (gain_tag_name != NULL || peak_tag_name != NULL);
}
static gboolean
id3v2_tag_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
const gchar * tag_str)
@ -442,6 +535,13 @@ id3v2_tag_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
if (g_value_transform (&src, &dest)) {
gst_tag_list_add_values (tag_list, GST_TAG_MERGE_APPEND,
tag_name, &dest, NULL);
} else if (tag_type == G_TYPE_DOUBLE) {
/* replaygain tags in TXXX frames ... */
g_value_set_double (&dest, g_strtod (tag_str, NULL));
gst_tag_list_add_values (tag_list, GST_TAG_MERGE_KEEP,
tag_name, &dest, NULL);
GST_LOG ("Converted string '%s' to double %f", tag_str,
g_value_get_double (&dest));
} else {
GST_WARNING ("Failed to transform tag from string to type '%s'",
g_type_name (tag_type));