mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 16:26:39 +00:00
41585b7e78
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 ;)
152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/* 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;
|
|
}
|