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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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300 lines
8.9 KiB
C
300 lines
8.9 KiB
C
/* -*- Mode: c; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* GStreamer IVF parser
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* (c) 2010 Opera Software ASA, Philip Jägenstedt <philipj@opera.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/* Snippets of source code copied freely from wavparse,
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* aviparse and auparse. */
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/* File format as written by libvpx ivfenc:
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*
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* All fields are little endian.
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*
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* 32 byte file header format:
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*
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* 0-3: "DKIF" (file magic)
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* 4-5: version (uint16)
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* 6-7: header size (uint16)
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* 8-11: "VP80" (FOURCC)
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* 12-13: width (uint16)
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* 14-15: height (uint16)
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* 16-19: framerate numerator (uint32)
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* 20-23: framerate denominator (uint32)
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* 24-27: frame count (uint32)
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* 28-31: unused
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*
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* 12 byte frame header format:
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*
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* 0-3: frame size in bytes (uint32)
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* 4-11: time stamp (uint64)
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "gstivfparse.h"
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GST_DEBUG_CATEGORY_STATIC (gst_ivf_parse_debug);
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#define GST_CAT_DEFAULT gst_ivf_parse_debug
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/* sink and src pad templates */
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-ivf")
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);
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("ANY")
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);
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GST_BOILERPLATE (GstIvfParse, gst_ivf_parse, GstElement, GST_TYPE_ELEMENT);
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static void gst_ivf_parse_dispose (GObject * object);
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static GstFlowReturn gst_ivf_parse_chain (GstPad * pad, GstBuffer * buf);
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/* GObject vmethod implementations */
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static void
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gst_ivf_parse_base_init (gpointer gclass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
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gst_element_class_set_static_metadata (element_class,
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"IVF parser",
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"Codec/Demuxer",
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"Demuxes a IVF stream", "Philip Jägenstedt <philipj@opera.com>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_factory));
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}
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/* initialize the ivfparse's class */
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static void
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gst_ivf_parse_class_init (GstIvfParseClass * klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass *) klass;
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gobject_class->dispose = gst_ivf_parse_dispose;
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}
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static void
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gst_ivf_parse_reset (GstIvfParse * ivf)
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{
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if (ivf->adapter) {
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gst_adapter_clear (ivf->adapter);
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g_object_unref (ivf->adapter);
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ivf->adapter = NULL;
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}
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ivf->state = GST_IVF_PARSE_START;
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ivf->rate_num = 0;
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ivf->rate_den = 0;
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}
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/* initialize the new element
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* instantiate pads and add them to element
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* set pad calback functions
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* initialize instance structure
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*/
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static void
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gst_ivf_parse_init (GstIvfParse * ivf, GstIvfParseClass * gclass)
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{
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/* sink pad */
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ivf->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
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gst_pad_set_chain_function (ivf->sinkpad,
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GST_DEBUG_FUNCPTR (gst_ivf_parse_chain));
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/* src pad */
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ivf->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
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gst_pad_use_fixed_caps (ivf->srcpad);
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gst_element_add_pad (GST_ELEMENT (ivf), ivf->sinkpad);
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gst_element_add_pad (GST_ELEMENT (ivf), ivf->srcpad);
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/* reset */
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gst_ivf_parse_reset (ivf);
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}
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static void
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gst_ivf_parse_dispose (GObject * object)
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{
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GstIvfParse *ivf = GST_IVF_PARSE (object);
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GST_DEBUG_OBJECT (ivf, "disposing");
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gst_ivf_parse_reset (ivf);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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/* GstElement vmethod implementations */
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/* chain function
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* this function does the actual processing
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*/
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static GstFlowReturn
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gst_ivf_parse_chain (GstPad * pad, GstBuffer * buf)
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{
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GstIvfParse *ivf = GST_IVF_PARSE (GST_OBJECT_PARENT (pad));
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gboolean res;
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/* lazy creation of the adapter */
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if (G_UNLIKELY (ivf->adapter == NULL)) {
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ivf->adapter = gst_adapter_new ();
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}
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GST_LOG_OBJECT (ivf, "Pushing buffer of size %u to adapter",
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GST_BUFFER_SIZE (buf));
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gst_adapter_push (ivf->adapter, buf); /* adapter takes ownership of buf */
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res = GST_FLOW_OK;
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switch (ivf->state) {
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case GST_IVF_PARSE_START:
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if (gst_adapter_available (ivf->adapter) >= 32) {
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GstCaps *caps;
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const guint8 *data = gst_adapter_peek (ivf->adapter, 32);
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guint32 magic = GST_READ_UINT32_LE (data);
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guint16 version = GST_READ_UINT16_LE (data + 4);
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guint16 header_size = GST_READ_UINT16_LE (data + 6);
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guint32 fourcc = GST_READ_UINT32_LE (data + 8);
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guint16 width = GST_READ_UINT16_LE (data + 12);
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guint16 height = GST_READ_UINT16_LE (data + 14);
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guint32 rate_num = GST_READ_UINT32_LE (data + 16);
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guint32 rate_den = GST_READ_UINT32_LE (data + 20);
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#ifndef GST_DISABLE_GST_DEBUG
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guint32 num_frames = GST_READ_UINT32_LE (data + 24);
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#endif
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/* last 4 bytes unused */
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gst_adapter_flush (ivf->adapter, 32);
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if (magic != GST_MAKE_FOURCC ('D', 'K', 'I', 'F') ||
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version != 0 || header_size != 32 ||
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fourcc != GST_MAKE_FOURCC ('V', 'P', '8', '0')) {
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GST_ELEMENT_ERROR (ivf, STREAM, WRONG_TYPE, (NULL), (NULL));
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return GST_FLOW_ERROR;
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}
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/* create src pad caps */
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caps = gst_caps_new_simple ("video/x-vp8",
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"width", G_TYPE_INT, width, "height", G_TYPE_INT, height,
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"framerate", GST_TYPE_FRACTION, rate_num, rate_den, NULL);
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GST_INFO_OBJECT (ivf, "Found stream: %" GST_PTR_FORMAT, caps);
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GST_LOG_OBJECT (ivf, "Stream has %d frames", num_frames);
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gst_pad_set_caps (ivf->srcpad, caps);
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gst_caps_unref (caps);
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/* keep framerate in instance for convenience */
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ivf->rate_num = rate_num;
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ivf->rate_den = rate_den;
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gst_pad_push_event (ivf->srcpad, gst_event_new_new_segment (FALSE, 1.0,
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GST_FORMAT_TIME, 0, -1, 0));
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/* move along */
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ivf->state = GST_IVF_PARSE_DATA;
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} else {
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GST_LOG_OBJECT (ivf, "Header data not yet available.");
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break;
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}
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/* fall through */
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case GST_IVF_PARSE_DATA:
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while (gst_adapter_available (ivf->adapter) > 12) {
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const guint8 *data = gst_adapter_peek (ivf->adapter, 12);
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guint32 frame_size = GST_READ_UINT32_LE (data);
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guint64 frame_pts = GST_READ_UINT64_LE (data + 4);
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GST_LOG_OBJECT (ivf,
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"Read frame header: size %u, pts %" G_GUINT64_FORMAT, frame_size,
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frame_pts);
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if (gst_adapter_available (ivf->adapter) >= 12 + frame_size) {
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GstBuffer *frame;
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gst_adapter_flush (ivf->adapter, 12);
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frame = gst_adapter_take_buffer (ivf->adapter, frame_size);
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gst_buffer_set_caps (frame, GST_PAD_CAPS (ivf->srcpad));
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GST_BUFFER_TIMESTAMP (frame) =
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gst_util_uint64_scale_int (GST_SECOND * frame_pts, ivf->rate_den,
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ivf->rate_num);
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GST_BUFFER_DURATION (frame) =
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gst_util_uint64_scale_int (GST_SECOND, ivf->rate_den,
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ivf->rate_num);
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GST_DEBUG_OBJECT (ivf, "Pushing frame of size %u, ts %"
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GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT ", off %"
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G_GUINT64_FORMAT ", off_end %" G_GUINT64_FORMAT,
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GST_BUFFER_SIZE (frame),
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (frame)),
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GST_TIME_ARGS (GST_BUFFER_DURATION (frame)),
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GST_BUFFER_OFFSET (frame), GST_BUFFER_OFFSET_END (frame));
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res = gst_pad_push (ivf->srcpad, frame);
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if (res != GST_FLOW_OK)
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break;
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} else {
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GST_LOG_OBJECT (ivf, "Frame data not yet available.");
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break;
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}
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}
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break;
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default:
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g_return_val_if_reached (GST_FLOW_ERROR);
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}
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return res;
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}
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/* entry point to initialize the plug-in */
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static gboolean
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ivfparse_init (GstPlugin * ivfparse)
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{
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/* debug category for filtering log messages */
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GST_DEBUG_CATEGORY_INIT (gst_ivf_parse_debug, "ivfparse", 0, "IVF parser");
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/* register parser element */
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if (!gst_element_register (ivfparse, "ivfparse", GST_RANK_PRIMARY,
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GST_TYPE_IVF_PARSE))
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return FALSE;
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return TRUE;
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}
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/* gstreamer looks for this structure to register plugins */
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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ivfparse,
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"IVF parser",
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ivfparse_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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