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gstreamer/gst/ivfparse/gstivfparse.c

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/* -*- Mode: c; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* GStreamer IVF parser
* (c) 2010 Opera Software ASA, Philip Jägenstedt <philipj@opera.com>
*
* 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.
*/
/* Snippets of source code copied freely from wavparse,
* aviparse and auparse. */
/* File format as written by libvpx ivfenc:
*
* All fields are little endian.
*
* 32 byte file header format:
*
* 0-3: "DKIF" (file magic)
* 4-5: version (uint16)
* 6-7: header size (uint16)
* 8-11: "VP80" (FOURCC)
* 12-13: width (uint16)
* 14-15: height (uint16)
* 16-19: framerate numerator (uint32)
* 20-23: framerate denominator (uint32)
* 24-27: frame count (uint32)
* 28-31: unused
*
* 12 byte frame header format:
*
* 0-3: frame size in bytes (uint32)
* 4-11: time stamp (uint64)
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "gstivfparse.h"
GST_DEBUG_CATEGORY_STATIC (gst_ivf_parse_debug);
#define GST_CAT_DEFAULT gst_ivf_parse_debug
/* sink and src pad templates */
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-ivf")
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("ANY")
);
GST_BOILERPLATE (GstIvfParse, gst_ivf_parse, GstElement, GST_TYPE_ELEMENT);
static void gst_ivf_parse_dispose (GObject * object);
static GstFlowReturn gst_ivf_parse_chain (GstPad * pad, GstBuffer * buf);
/* GObject vmethod implementations */
static void
gst_ivf_parse_base_init (gpointer gclass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
gst_element_class_set_metadata (element_class,
"IVF parser",
"Codec/Demuxer",
"Demuxes a IVF stream", "Philip Jägenstedt <philipj@opera.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
}
/* initialize the ivfparse's class */
static void
gst_ivf_parse_class_init (GstIvfParseClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->dispose = gst_ivf_parse_dispose;
}
static void
gst_ivf_parse_reset (GstIvfParse * ivf)
{
if (ivf->adapter) {
gst_adapter_clear (ivf->adapter);
g_object_unref (ivf->adapter);
ivf->adapter = NULL;
}
ivf->state = GST_IVF_PARSE_START;
ivf->rate_num = 0;
ivf->rate_den = 0;
}
/* initialize the new element
* instantiate pads and add them to element
* set pad calback functions
* initialize instance structure
*/
static void
gst_ivf_parse_init (GstIvfParse * ivf, GstIvfParseClass * gclass)
{
/* sink pad */
ivf->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
gst_pad_set_chain_function (ivf->sinkpad,
GST_DEBUG_FUNCPTR (gst_ivf_parse_chain));
/* src pad */
ivf->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
gst_pad_use_fixed_caps (ivf->srcpad);
gst_element_add_pad (GST_ELEMENT (ivf), ivf->sinkpad);
gst_element_add_pad (GST_ELEMENT (ivf), ivf->srcpad);
/* reset */
gst_ivf_parse_reset (ivf);
}
static void
gst_ivf_parse_dispose (GObject * object)
{
GstIvfParse *ivf = GST_IVF_PARSE (object);
GST_DEBUG_OBJECT (ivf, "disposing");
gst_ivf_parse_reset (ivf);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
/* GstElement vmethod implementations */
/* chain function
* this function does the actual processing
*/
static GstFlowReturn
gst_ivf_parse_chain (GstPad * pad, GstBuffer * buf)
{
GstIvfParse *ivf = GST_IVF_PARSE (GST_OBJECT_PARENT (pad));
gboolean res;
/* lazy creation of the adapter */
if (G_UNLIKELY (ivf->adapter == NULL)) {
ivf->adapter = gst_adapter_new ();
}
GST_LOG_OBJECT (ivf, "Pushing buffer of size %u to adapter",
GST_BUFFER_SIZE (buf));
gst_adapter_push (ivf->adapter, buf); /* adapter takes ownership of buf */
res = GST_FLOW_OK;
switch (ivf->state) {
case GST_IVF_PARSE_START:
if (gst_adapter_available (ivf->adapter) >= 32) {
GstCaps *caps;
const guint8 *data = gst_adapter_peek (ivf->adapter, 32);
guint32 magic = GST_READ_UINT32_LE (data);
guint16 version = GST_READ_UINT16_LE (data + 4);
guint16 header_size = GST_READ_UINT16_LE (data + 6);
guint32 fourcc = GST_READ_UINT32_LE (data + 8);
guint16 width = GST_READ_UINT16_LE (data + 12);
guint16 height = GST_READ_UINT16_LE (data + 14);
guint32 rate_num = GST_READ_UINT32_LE (data + 16);
guint32 rate_den = GST_READ_UINT32_LE (data + 20);
#ifndef GST_DISABLE_GST_DEBUG
guint32 num_frames = GST_READ_UINT32_LE (data + 24);
#endif
/* last 4 bytes unused */
gst_adapter_flush (ivf->adapter, 32);
if (magic != GST_MAKE_FOURCC ('D', 'K', 'I', 'F') ||
version != 0 || header_size != 32 ||
fourcc != GST_MAKE_FOURCC ('V', 'P', '8', '0')) {
GST_ELEMENT_ERROR (ivf, STREAM, WRONG_TYPE, (NULL), (NULL));
return GST_FLOW_ERROR;
}
/* create src pad caps */
caps = gst_caps_new_simple ("video/x-vp8",
"width", G_TYPE_INT, width, "height", G_TYPE_INT, height,
"framerate", GST_TYPE_FRACTION, rate_num, rate_den, NULL);
GST_INFO_OBJECT (ivf, "Found stream: %" GST_PTR_FORMAT, caps);
GST_LOG_OBJECT (ivf, "Stream has %d frames", num_frames);
gst_pad_set_caps (ivf->srcpad, caps);
gst_caps_unref (caps);
/* keep framerate in instance for convenience */
ivf->rate_num = rate_num;
ivf->rate_den = rate_den;
gst_pad_push_event (ivf->srcpad, gst_event_new_new_segment (FALSE, 1.0,
GST_FORMAT_TIME, 0, -1, 0));
/* move along */
ivf->state = GST_IVF_PARSE_DATA;
} else {
GST_LOG_OBJECT (ivf, "Header data not yet available.");
break;
}
/* fall through */
case GST_IVF_PARSE_DATA:
while (gst_adapter_available (ivf->adapter) > 12) {
const guint8 *data = gst_adapter_peek (ivf->adapter, 12);
guint32 frame_size = GST_READ_UINT32_LE (data);
guint64 frame_pts = GST_READ_UINT64_LE (data + 4);
GST_LOG_OBJECT (ivf,
"Read frame header: size %u, pts %" G_GUINT64_FORMAT, frame_size,
frame_pts);
if (gst_adapter_available (ivf->adapter) >= 12 + frame_size) {
GstBuffer *frame;
gst_adapter_flush (ivf->adapter, 12);
frame = gst_adapter_take_buffer (ivf->adapter, frame_size);
gst_buffer_set_caps (frame, GST_PAD_CAPS (ivf->srcpad));
GST_BUFFER_TIMESTAMP (frame) =
gst_util_uint64_scale_int (GST_SECOND * frame_pts, ivf->rate_den,
ivf->rate_num);
GST_BUFFER_DURATION (frame) =
gst_util_uint64_scale_int (GST_SECOND, ivf->rate_den,
ivf->rate_num);
GST_DEBUG_OBJECT (ivf, "Pushing frame of size %u, ts %"
GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT ", off %"
G_GUINT64_FORMAT ", off_end %" G_GUINT64_FORMAT,
GST_BUFFER_SIZE (frame),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (frame)),
GST_TIME_ARGS (GST_BUFFER_DURATION (frame)),
GST_BUFFER_OFFSET (frame), GST_BUFFER_OFFSET_END (frame));
res = gst_pad_push (ivf->srcpad, frame);
if (res != GST_FLOW_OK)
break;
} else {
GST_LOG_OBJECT (ivf, "Frame data not yet available.");
break;
}
}
break;
default:
g_return_val_if_reached (GST_FLOW_ERROR);
}
return res;
}
/* entry point to initialize the plug-in */
static gboolean
ivfparse_init (GstPlugin * ivfparse)
{
/* debug category for filtering log messages */
GST_DEBUG_CATEGORY_INIT (gst_ivf_parse_debug, "ivfparse", 0, "IVF parser");
/* register parser element */
if (!gst_element_register (ivfparse, "ivfparse", GST_RANK_PRIMARY,
GST_TYPE_IVF_PARSE))
return FALSE;
return TRUE;
}
/* gstreamer looks for this structure to register plugins */
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
ivfparse,
"IVF parser",
ivfparse_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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