gstreamer/gst/multifile/gstmultifilesrc.c

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/* GStreamer
* Copyright (C) 2006 David A. Schleef <ds@schleef.org>
*
* gstmultifilesrc.c:
*
* 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.
*/
/**
* SECTION:element-multifilesrc
* @short_description: Read buffers from sequentially-named files
* @see_also: #GstFileSrc
*
* <refsect2>
* <para>
* Reads buffers from sequentially named files. If used together with an image
* decoder, one needs to use the GstMultiFileSrc::caps property or a capsfilter
* to force to caps containing a framerate. Otherwise image decoders send EOS
* after the first picture.
* </para>
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch multifilesrc location="img.%04d.png" index=0 caps="image/png,framerate=\(fraction\)12/1" ! \
* pngdec ! ffmpegcolorspace ! theoraenc ! oggmux ! \
* filesink location="images.ogg"
* </programlisting>
* This pipeline creates a video file "images.ogg" by joining multiple PNG
* files named img.0000.png, img.0001.png, etc.
* </para>
* <para>
* File names are created by replacing "%%d" with the index using printf().
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstmultifilesrc.h"
static GstFlowReturn gst_multi_file_src_create (GstPushSrc * src,
GstBuffer ** buffer);
static void gst_multi_file_src_dispose (GObject * object);
static void gst_multi_file_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_multi_file_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *gst_multi_file_src_getcaps (GstBaseSrc * src);
static GstStaticPadTemplate gst_multi_file_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_multi_file_src_debug);
#define GST_CAT_DEFAULT gst_multi_file_src_debug
static const GstElementDetails gst_multi_file_src_details =
GST_ELEMENT_DETAILS ("Multi-File Source",
"Source/File",
"Read stream from files",
"David Schleef <ds@schleef.org>");
enum
{
ARG_0,
ARG_LOCATION,
ARG_INDEX,
ARG_CAPS
};
#define DEFAULT_LOCATION "%05d"
#define DEFAULT_INDEX 0
GST_BOILERPLATE (GstMultiFileSrc, gst_multi_file_src, GstPushSrc,
GST_TYPE_PUSH_SRC);
static void
gst_multi_file_src_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
GST_DEBUG_CATEGORY_INIT (gst_multi_file_src_debug, "multifilesrc", 0,
"multifilesrc element");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_multi_file_src_pad_template));
gst_element_class_set_details (gstelement_class, &gst_multi_file_src_details);
}
static void
gst_multi_file_src_class_init (GstMultiFileSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstPushSrcClass *gstpushsrc_class = GST_PUSH_SRC_CLASS (klass);
GstBaseSrcClass *gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
gobject_class->set_property = gst_multi_file_src_set_property;
gobject_class->get_property = gst_multi_file_src_get_property;
g_object_class_install_property (gobject_class, ARG_LOCATION,
g_param_spec_string ("location", "File Location",
"Pattern to create file names of input files. File names are "
"created by calling sprintf() with the pattern and the current "
"index.", DEFAULT_LOCATION, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_INDEX,
g_param_spec_int ("index", "File Index",
"Index to use with location property to create file names. The "
"index is incremented by one for each buffer read.",
0, INT_MAX, DEFAULT_INDEX, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_CAPS,
g_param_spec_boxed ("caps", "Caps",
"Caps describing the format of the data.",
GST_TYPE_CAPS, G_PARAM_READWRITE));
gobject_class->dispose = gst_multi_file_src_dispose;
gstpushsrc_class->create = gst_multi_file_src_create;
gstbasesrc_class->get_caps = gst_multi_file_src_getcaps;
if (sizeof (off_t) < 8) {
GST_LOG ("No large file support, sizeof (off_t) = %" G_GSIZE_FORMAT,
sizeof (off_t));
}
}
static void
gst_multi_file_src_init (GstMultiFileSrc * multifilesrc,
GstMultiFileSrcClass * g_class)
{
GstPad *pad;
pad = GST_BASE_SRC_PAD (multifilesrc);
multifilesrc->index = DEFAULT_INDEX;
multifilesrc->filename = g_strdup (DEFAULT_LOCATION);
multifilesrc->successful_read = FALSE;
}
static void
gst_multi_file_src_dispose (GObject * object)
{
GstMultiFileSrc *src = GST_MULTI_FILE_SRC (object);
g_free (src->filename);
src->filename = NULL;
if (src->caps)
gst_caps_unref (src->caps);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static GstCaps *
gst_multi_file_src_getcaps (GstBaseSrc * src)
{
GstMultiFileSrc *multi_file_src = GST_MULTI_FILE_SRC (src);
GST_DEBUG_OBJECT (src, "returning %" GST_PTR_FORMAT, multi_file_src->caps);
if (multi_file_src->caps) {
return gst_caps_ref (multi_file_src->caps);
} else {
return gst_caps_new_any ();
}
}
static gboolean
gst_multi_file_src_set_location (GstMultiFileSrc * src, const gchar * location)
{
g_free (src->filename);
if (location != NULL) {
src->filename = g_strdup (location);
} else {
src->filename = NULL;
}
return TRUE;
}
static void
gst_multi_file_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMultiFileSrc *src = GST_MULTI_FILE_SRC (object);
switch (prop_id) {
case ARG_LOCATION:
gst_multi_file_src_set_location (src, g_value_get_string (value));
break;
case ARG_INDEX:
src->index = g_value_get_int (value);
break;
case ARG_CAPS:
{
const GstCaps *caps = gst_value_get_caps (value);
GstCaps *new_caps;
if (caps == NULL) {
new_caps = gst_caps_new_any ();
} else {
new_caps = gst_caps_copy (caps);
}
gst_caps_replace (&src->caps, new_caps);
gst_pad_set_caps (GST_BASE_SRC_PAD (src), new_caps);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_multi_file_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstMultiFileSrc *src = GST_MULTI_FILE_SRC (object);
switch (prop_id) {
case ARG_LOCATION:
g_value_set_string (value, src->filename);
break;
case ARG_INDEX:
g_value_set_int (value, src->index);
break;
case ARG_CAPS:
gst_value_set_caps (value, src->caps);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gchar *
gst_multi_file_src_get_filename (GstMultiFileSrc * multifilesrc)
{
gchar *filename;
filename = g_strdup_printf (multifilesrc->filename, multifilesrc->index);
return filename;
}
static GstFlowReturn
gst_multi_file_src_create (GstPushSrc * src, GstBuffer ** buffer)
{
GstMultiFileSrc *multifilesrc;
guint size;
gchar *filename;
FILE *file;
GstBuffer *buf;
int ret;
multifilesrc = GST_MULTI_FILE_SRC (src);
filename = gst_multi_file_src_get_filename (multifilesrc);
GST_DEBUG_OBJECT (multifilesrc, "reading from file \"%s\".", filename);
file = fopen (filename, "rb");
if (!file) {
if (multifilesrc->successful_read) {
/* If we've read at least one buffer successfully, not finding the
* next file is EOS. */
g_free (filename);
return GST_FLOW_UNEXPECTED;
} else {
goto handle_error;
}
}
fseek (file, 0, SEEK_END);
size = ftell (file);
fseek (file, 0, SEEK_SET);
buf = gst_buffer_new_and_alloc (size);
ret = fread (GST_BUFFER_DATA (buf), size, 1, file);
if (ret < 1) {
goto handle_error;
}
multifilesrc->successful_read = TRUE;
multifilesrc->index++;
GST_BUFFER_SIZE (buf) = size;
GST_BUFFER_OFFSET (buf) = multifilesrc->offset;
GST_BUFFER_OFFSET_END (buf) = multifilesrc->offset + size;
multifilesrc->offset += size;
gst_buffer_set_caps (buf, multifilesrc->caps);
GST_DEBUG_OBJECT (multifilesrc, "read file \"%s\".", filename);
fclose (file);
g_free (filename);
*buffer = buf;
return GST_FLOW_OK;
handle_error:
{
switch (errno) {
default:{
GST_ELEMENT_ERROR (multifilesrc, RESOURCE, READ,
("Error while reading from file \"%s\".", filename),
("%s", g_strerror (errno)));
}
}
g_free (filename);
return GST_FLOW_ERROR;
}
}