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authorThomas Vander Stichele <thomas@apestaart.org>2001-12-22 23:43:34 +0000
committerThomas Vander Stichele <thomas@apestaart.org>2001-12-22 23:43:34 +0000
commit41585b7e7836988c2e6ca136f8a85733ff2dc3cc (patch)
tree46e41cabc8389bcc1525a4c9dd2dbbac25d6b0bb /gst-libs/gst/audio/audio.c
parent0e758d6292d8c330db3c0abcaa0a9a359a27cf10 (diff)
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moving and renaming we put the libs in the source in gst-libs/gst/(dir) the headers get installed in prefix/include/g...
Original commit message from CVS: moving and renaming we put the libs in the source in gst-libs/gst/(dir) the headers get installed in prefix/include/gst/(dir) the libs are installed in prefix/lib/gst with a libgst prefix the sources should be without the gst prefix as per irc agreement please comment if this sounds like a bad idea ;)
Diffstat (limited to 'gst-libs/gst/audio/audio.c')
-rw-r--r--gst-libs/gst/audio/audio.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/gst-libs/gst/audio/audio.c b/gst-libs/gst/audio/audio.c
new file mode 100644
index 00000000..31b9ed89
--- /dev/null
+++ b/gst-libs/gst/audio/audio.c
@@ -0,0 +1,152 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <gst/audio/audio.h>
+
+int
+gst_audio_frame_byte_size (GstPad* pad)
+{
+/* calculate byte size of an audio frame
+ * this should be moved closer to the gstreamer core
+ * and be implemented for every mime type IMO
+ * returns 0 if there's an error, or the byte size if everything's ok
+ */
+
+ int width = 0;
+ int channels = 0;
+
+ GstCaps *caps = NULL;
+
+ /* get caps of pad */
+ caps = GST_PAD_CAPS (pad);
+
+ if (caps == NULL)
+ /* ERROR: could not get caps of pad */
+ return 0;
+
+ width = gst_caps_get_int (caps, "width");
+ channels = gst_caps_get_int (caps, "channels");
+ return (width / 8) * channels;
+}
+
+long
+gst_audio_frame_length (GstPad* pad, GstBuffer* buf)
+/* calculate length of buffer in frames
+ * this should be moved closer to the gstreamer core
+ * and be implemented for every mime type IMO
+ * returns 0 if there's an error, or the number of frames if everything's ok
+ */
+{
+ int frame_byte_size = 0;
+
+ frame_byte_size = gst_audio_frame_byte_size (pad);
+ if (frame_byte_size == 0)
+ /* error */
+ return 0;
+ /* FIXME: this function assumes the buffer size to be a whole multiple
+ * of the frame byte size
+ */
+ return GST_BUFFER_SIZE (buf) / frame_byte_size;
+}
+
+long
+gst_audio_frame_rate (GstPad *pad)
+/*
+ * calculate frame rate (based on caps of pad)
+ * returns 0 if failed, rate if success
+ */
+{
+ GstCaps *caps = NULL;
+
+ /* get caps of pad */
+ caps = GST_PAD_CAPS (pad);
+
+ if (caps == NULL)
+ /* ERROR: could not get caps of pad */
+ return 0;
+ else
+ return gst_caps_get_int (caps, "rate");
+}
+
+double
+gst_audio_length (GstPad* pad, GstBuffer* buf)
+{
+/* calculate length in seconds
+ * of audio buffer buf
+ * based on capabilities of pad
+ */
+
+ long bytes = 0;
+ int width = 0;
+ int channels = 0;
+ long rate = 0L;
+
+ double length;
+
+ GstCaps *caps = NULL;
+
+ /* get caps of pad */
+ caps = GST_PAD_CAPS (pad);
+ if (caps == NULL)
+ {
+ /* ERROR: could not get caps of pad */
+ length = 0.0;
+ }
+ else
+ {
+ bytes = GST_BUFFER_SIZE (buf);
+ width = gst_caps_get_int (caps, "width");
+ channels = gst_caps_get_int (caps, "channels");
+ rate = gst_caps_get_int (caps, "rate");
+
+ length = (bytes * 8.0) / (double) (rate * channels * width);
+ }
+ return length;
+}
+
+long
+gst_audio_highest_sample_value (GstPad* pad)
+/* calculate highest possible sample value
+ * based on capabilities of pad
+ */
+{
+ gboolean is_signed = FALSE;
+ gint width = 0;
+ GstCaps *caps = NULL;
+
+ caps = GST_PAD_CAPS (pad);
+ // FIXME : Please change this to a better warning method !
+ if (caps == NULL)
+ printf ("WARNING: gstaudio: could not get caps of pad !\n");
+ width = gst_caps_get_int (caps, "width");
+ is_signed = gst_caps_get_boolean (caps, "signed");
+ if (is_signed) --width;
+ /* example : 16 bit, signed : samples between -32768 and 32767 */
+ return ((long) (1 << width));
+}
+
+gboolean
+gst_audio_is_buffer_framed (GstPad* pad, GstBuffer* buf)
+/* check if the buffer size is a whole multiple of the frame size */
+{
+ if (GST_BUFFER_SIZE (buf) % gst_audio_frame_byte_size (pad) == 0)
+ return TRUE;
+ else
+ return FALSE;
+}