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add an 'average-bitrate' property and everything necessary to compute it to mad

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Original commit message from CVS:
add an 'average-bitrate' property and everything necessary to compute it to mad
This commit is contained in:
Benjamin Otte 2002-02-13 08:15:34 +00:00
parent e9e30f750e
commit a77aca90da
1 changed files with 36 additions and 4 deletions
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40
ext/mad/gstmad.c
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@ -58,6 +58,9 @@ struct _GstMad {
struct mad_header header;
gboolean new_header;
gint channels;
guint framecount;
gint vbr_average; /* average bitrate */
gulong vbr_rate; /* average * framecount */
};
struct _GstMadClass {
@ -89,6 +92,7 @@ enum {
ARG_BITRATE,
ARG_SAMPLERATE,
ARG_CHANNELS,
ARG_AVERAGE_BITRATE,
/* FILL ME */
};
@ -138,7 +142,7 @@ static GstElementStateReturn
static GstElementClass *parent_class = NULL;
//static guint gst_mad_signals[LAST_SIGNAL] = { 0 };
/* static guint gst_mad_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_mad_get_type (void)
@ -197,6 +201,9 @@ gst_mad_class_init (GstMadClass *klass)
g_object_class_install_property (gobject_class, ARG_BITRATE,
g_param_spec_int ("bitrate", "Bitrate", "current bitrate of the stream",
0, G_MAXINT, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, ARG_AVERAGE_BITRATE,
g_param_spec_int ("average-bitrate", "average bitrate", "average bitrate of the stream",
0, G_MAXINT, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, ARG_SAMPLERATE,
g_param_spec_int ("samplerate", "Samplerate", "current samplerate of the stream",
0, G_MAXINT, 0, G_PARAM_READABLE));
@ -227,6 +234,9 @@ gst_mad_init (GstMad *mad)
mad->total_samples = 0;
mad->sync_point = 0;
mad->new_header = TRUE;
mad->framecount = 0;
mad->vbr_average = 0;
mad->vbr_rate = 0;
}
static void
@ -295,6 +305,9 @@ gst_mad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec
case ARG_BITRATE:
g_value_set_int (value, mad->header.bitrate);
break;
case ARG_AVERAGE_BITRATE:
g_value_set_int (value, mad->vbr_average);
break;
case ARG_SAMPLERATE:
g_value_set_int (value, mad->header.samplerate);
break;
@ -309,6 +322,7 @@ gst_mad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec
static void
gst_mad_update_info (GstMad *mad, struct mad_header const *header)
{
gint abr = mad->vbr_average;
#define CHECK_HEADER(h1,str) \
G_STMT_START{ \
if (mad->header.h1 != header->h1 || mad->new_header) { \
@ -316,8 +330,25 @@ G_STMT_START{ \
g_object_notify (G_OBJECT (mad), str); \
}; \
} G_STMT_END
g_object_freeze_notify (G_OBJECT (mad));
/* update average bitrate */
if (mad->new_header)
{
mad->framecount = 1;
mad->vbr_rate = header->bitrate;
abr = 0;
} else {
mad->framecount++;
mad->vbr_rate += header->bitrate;
}
mad->vbr_average = (gint) (mad->vbr_rate / mad->framecount);
if (abr != mad->vbr_average)
{
g_object_notify (G_OBJECT (mad), "average_bitrate");
}
CHECK_HEADER (layer, "layer");
CHECK_HEADER (mode, "mode");
CHECK_HEADER (emphasis, "emphasis");
@ -328,6 +359,7 @@ G_STMT_START{ \
g_object_notify (G_OBJECT (mad), "channels");
}
mad->new_header = FALSE;
g_object_thaw_notify (G_OBJECT (mad));
#undef CHECK_HEADER
@ -396,14 +428,14 @@ gst_mad_chain (GstPad *pad, GstBuffer *buffer)
left_ch = mad->synth.pcm.samples[0];
right_ch = mad->synth.pcm.samples[1];
mad->total_samples += nsamples;
gst_mad_update_info (mad, &mad->frame.header);
outbuffer = gst_buffer_new ();
outdata = (gint16 *) GST_BUFFER_DATA (outbuffer) = g_malloc (nsamples * nchannels * 2);
GST_BUFFER_SIZE (outbuffer) = nsamples * nchannels * 2;
mad->total_samples += nsamples;
if (GST_BUFFER_TIMESTAMP (buffer) != -1) {
if (GST_BUFFER_TIMESTAMP (buffer) > mad->sync_point) {
mad->sync_point = GST_BUFFER_TIMESTAMP (buffer);