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mpegaudioparse: Don't use expensive glib ways to get an enum nick.

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Fixes #598761

This removes a good 50% of processing time for parsing a buffer.

We do this by simply... getting the nicks that we already have handy
instead of going through the expensive glib system.
This commit is contained in:
Edward Hervey 2009-10-17 13:46:13 +02:00
parent 90ca3dcc17
commit 33b4528a0e
1 changed files with 23 additions and 19 deletions
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42
gst/mpegaudioparse/gstmpegaudioparse.c
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@ -138,18 +138,20 @@ mp3parse_total_time (GstMPEGAudioParse * mp3parse, GstClockTime * total);
GST_BOILERPLATE (GstMPEGAudioParse, gst_mp3parse, GstElement, GST_TYPE_ELEMENT);
#define GST_TYPE_MP3_CHANNEL_MODE (gst_mp3_channel_mode_get_type())
static const GEnumValue mp3_channel_mode[] = {
{MP3_CHANNEL_MODE_UNKNOWN, "Unknown", "unknown"},
{MP3_CHANNEL_MODE_MONO, "Mono", "mono"},
{MP3_CHANNEL_MODE_DUAL_CHANNEL, "Dual Channel", "dual-channel"},
{MP3_CHANNEL_MODE_JOINT_STEREO, "Joint Stereo", "joint-stereo"},
{MP3_CHANNEL_MODE_STEREO, "Stereo", "stereo"},
{0, NULL, NULL},
};
static GType
gst_mp3_channel_mode_get_type (void)
{
static GType mp3_channel_mode_type = 0;
static GEnumValue mp3_channel_mode[] = {
{MP3_CHANNEL_MODE_UNKNOWN, "Unknown", "unknown"},
{MP3_CHANNEL_MODE_MONO, "Mono", "mono"},
{MP3_CHANNEL_MODE_DUAL_CHANNEL, "Dual Channel", "dual-channel"},
{MP3_CHANNEL_MODE_JOINT_STEREO, "Joint Stereo", "joint-stereo"},
{MP3_CHANNEL_MODE_STEREO, "Stereo", "stereo"},
{0, NULL, NULL},
};
if (!mp3_channel_mode_type) {
mp3_channel_mode_type =
@ -158,6 +160,17 @@ gst_mp3_channel_mode_get_type (void)
return mp3_channel_mode_type;
}
static const gchar *
gst_mp3_channel_mode_get_nick (gint mode)
{
guint i;
for (i = 0; i < G_N_ELEMENTS (mp3_channel_mode); i++) {
if (mp3_channel_mode[i].value == mode)
return mp3_channel_mode[i].value_nick;
}
return NULL;
}
static const guint mp3types_bitrates[2][3][16] = {
{
{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448,},
@ -186,7 +199,6 @@ mp3_type_frame_length_from_header (GstMPEGAudioParse * mp3parse, guint32 header,
gulong mode, samplerate, bitrate, layer, channels, padding, crc;
gulong version;
gint lsf, mpg25;
GEnumValue *mode_enum;
if (header & (1 << 20)) {
lsf = (header & (1 << 19)) ? 0 : 1;
@ -229,14 +241,11 @@ mp3_type_frame_length_from_header (GstMPEGAudioParse * mp3parse, guint32 header,
break;
}
mode_enum =
g_enum_get_value (g_type_class_peek (GST_TYPE_MP3_CHANNEL_MODE), mode);
GST_DEBUG_OBJECT (mp3parse, "Calculated mp3 frame length of %u bytes",
length);
GST_DEBUG_OBJECT (mp3parse, "samplerate = %lu, bitrate = %lu, version = %lu, "
"layer = %lu, channels = %lu, mode = %s", samplerate, bitrate, version,
layer, channels, mode_enum->value_nick);
layer, channels, gst_mp3_channel_mode_get_nick (mode));
if (put_version)
*put_version = version;
@ -758,18 +767,13 @@ gst_mp3parse_emit_frame (GstMPEGAudioParse * mp3parse, guint size,
}
if (mp3parse->last_posted_channel_mode != mode) {
GEnumValue *mode_enum;
if (!taglist) {
taglist = gst_tag_list_new ();
}
mp3parse->last_posted_channel_mode = mode;
mode_enum =
g_enum_get_value (g_type_class_peek (GST_TYPE_MP3_CHANNEL_MODE), mode);
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_MODE,
mode_enum->value_nick, NULL);
gst_mp3_channel_mode_get_nick (mode), NULL);
}
/* if the taglist exists, we need to send it */