gstreamer/gst/mpeg4videoparse/mpeg4videoparse.c

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/* GStreamer
* Copyright (C) <2008> Mindfruit B.V.
* @author Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) <2007> Julien Moutte <julien@fluendo.com>
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* Copyright (C) <2011> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) <2011> Collabora Multimedia
* Copyright (C) <2011> Nokia Corporation
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
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#include <gst/base/gstbytereader.h>
#include "mpeg4videoparse.h"
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GST_DEBUG_CATEGORY (mpeg4v_parse_debug);
#define GST_CAT_DEFAULT mpeg4v_parse_debug
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) 4, "
"parsed = (boolean) true, " "systemstream = (boolean) false")
);
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) 4, "
"parsed = (boolean) false, " "systemstream = (boolean) false")
);
/* Properties */
#define DEFAULT_PROP_DROP TRUE
#define DEFAULT_CONFIG_INTERVAL (0)
enum
{
PROP_0,
PROP_DROP,
PROP_CONFIG_INTERVAL,
PROP_LAST
};
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GST_BOILERPLATE (GstMpeg4VParse, gst_mpeg4vparse, GstBaseParse,
GST_TYPE_BASE_PARSE);
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static gboolean gst_mpeg4vparse_start (GstBaseParse * parse);
static gboolean gst_mpeg4vparse_stop (GstBaseParse * parse);
static gboolean gst_mpeg4vparse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
static GstFlowReturn gst_mpeg4vparse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static GstFlowReturn gst_mpeg4vparse_pre_push_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_mpeg4vparse_set_caps (GstBaseParse * parse, GstCaps * caps);
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static void gst_mpeg4vparse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mpeg4vparse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
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static void
gst_mpeg4vparse_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
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gst_element_class_set_details_simple (element_class,
"MPEG 4 video elementary stream parser", "Codec/Parser/Video",
"Parses MPEG-4 Part 2 elementary video streams",
"Julien Moutte <julien@fluendo.com>");
}
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static void
gst_mpeg4vparse_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstMpeg4VParse *parse = GST_MPEG4VIDEOPARSE (object);
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switch (property_id) {
case PROP_DROP:
parse->drop = g_value_get_boolean (value);
break;
case PROP_CONFIG_INTERVAL:
parse->interval = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
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static void
gst_mpeg4vparse_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
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GstMpeg4VParse *parse = GST_MPEG4VIDEOPARSE (object);
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switch (property_id) {
case PROP_DROP:
g_value_set_boolean (value, parse->drop);
break;
case PROP_CONFIG_INTERVAL:
g_value_set_uint (value, parse->interval);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
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static void
gst_mpeg4vparse_class_init (GstMpeg4VParseClass * klass)
{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_mpeg4vparse_set_property;
gobject_class->get_property = gst_mpeg4vparse_get_property;
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g_object_class_install_property (gobject_class, PROP_DROP,
g_param_spec_boolean ("drop", "drop",
"Drop data untill valid configuration data is received either "
"in the stream or through caps", DEFAULT_PROP_DROP,
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_CONFIG_INTERVAL,
g_param_spec_uint ("config-interval",
"Configuration Send Interval",
"Send Configuration Insertion Interval in seconds (configuration headers "
"will be multiplexed in the data stream when detected.) (0 = disabled)",
0, 3600, DEFAULT_CONFIG_INTERVAL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/* Override BaseParse vfuncs */
parse_class->start = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_start);
parse_class->stop = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_stop);
parse_class->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_mpeg4vparse_check_valid_frame);
parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_parse_frame);
parse_class->pre_push_frame =
GST_DEBUG_FUNCPTR (gst_mpeg4vparse_pre_push_frame);
parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_set_caps);
}
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static void
gst_mpeg4vparse_init (GstMpeg4VParse * parse, GstMpeg4VParseClass * g_class)
{
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parse->interval = DEFAULT_CONFIG_INTERVAL;
parse->last_report = GST_CLOCK_TIME_NONE;
}
static void
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gst_mpeg4vparse_reset_frame (GstMpeg4VParse * mp4vparse)
{
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/* done parsing; reset state */
mp4vparse->last_sc = -1;
mp4vparse->vop_offset = -1;
mp4vparse->vos_offset = -1;
mp4vparse->vo_offset = -1;
}
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static void
gst_mpeg4vparse_reset (GstMpeg4VParse * mp4vparse)
{
gst_mpeg4vparse_reset_frame (mp4vparse);
mp4vparse->profile = 0;
mp4vparse->update_caps = TRUE;
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gst_buffer_replace (&mp4vparse->config, NULL);
memset (&mp4vparse->params, 0, sizeof (mp4vparse->params));
}
static gboolean
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gst_mpeg4vparse_start (GstBaseParse * parse)
{
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GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEOPARSE (parse);
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GST_DEBUG_OBJECT (parse, "start");
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gst_mpeg4vparse_reset (mp4vparse);
/* at least this much for a valid frame */
gst_base_parse_set_min_frame_size (parse, 6);
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return TRUE;
}
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static gboolean
gst_mpeg4vparse_stop (GstBaseParse * parse)
{
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GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEOPARSE (parse);
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GST_DEBUG_OBJECT (parse, "stop");
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gst_mpeg4vparse_reset (mp4vparse);
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return TRUE;
}
static gboolean
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gst_mpeg4vparse_process_config (GstMpeg4VParse * mp4vparse, const guint8 * data,
gsize size)
{
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/* only do stuff if something new */
if (mp4vparse->config && size == GST_BUFFER_SIZE (mp4vparse->config) &&
memcmp (GST_BUFFER_DATA (mp4vparse->config), data, size) == 0)
return TRUE;
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if (!gst_mpeg4_params_parse_config (&mp4vparse->params, data, size)) {
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GST_DEBUG_OBJECT (mp4vparse, "failed to parse config data (size %"
G_GSSIZE_FORMAT ")", size);
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return FALSE;
}
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GST_LOG_OBJECT (mp4vparse, "accepting parsed config size %" G_GSSIZE_FORMAT,
size);
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/* parsing ok, so accept it as new config */
if (mp4vparse->config != NULL)
gst_buffer_unref (mp4vparse->config);
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mp4vparse->config = gst_buffer_new_and_alloc (size);
memcpy (GST_BUFFER_DATA (mp4vparse->config), data, size);
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/* trigger src caps update */
mp4vparse->update_caps = TRUE;
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return TRUE;
}
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/* caller guarantees at least start code in @buf at @off */
static gboolean
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gst_mpeg4vparse_process_sc (GstMpeg4VParse * mp4vparse, GstBuffer * buf,
gint off)
{
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guint8 *data;
guint code;
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g_return_val_if_fail (buf && GST_BUFFER_SIZE (buf) >= off + 4, FALSE);
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data = GST_BUFFER_DATA (buf);
code = data[off + 3];
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GST_LOG_OBJECT (mp4vparse, "process startcode %x", code);
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/* if we found a VOP, next start code ends it,
* except for final VOS end sequence code included in last VOP-frame */
if (mp4vparse->vop_offset >= 0 && code != MPEG4_VOS_ENDCODE) {
if (G_LIKELY (GST_BUFFER_SIZE (buf) > mp4vparse->vop_offset + 4)) {
mp4vparse->intra_frame =
((data[mp4vparse->vop_offset + 4] >> 6 & 0x3) == 0);
} else {
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GST_WARNING_OBJECT (mp4vparse, "no data following VOP startcode");
mp4vparse->intra_frame = FALSE;
}
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GST_LOG_OBJECT (mp4vparse, "ending frame of size %d, is intra %d", off,
mp4vparse->intra_frame);
return TRUE;
}
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switch (code) {
case MPEG4_VOP_STARTCODE:
case MPEG4_GOP_STARTCODE:
{
gint offset;
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if (code == MPEG4_VOP_STARTCODE) {
GST_LOG_OBJECT (mp4vparse, "startcode is VOP");
mp4vparse->vop_offset = off;
} else {
GST_LOG_OBJECT (mp4vparse, "startcode is GOP");
}
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/* parse config data ending here if proper startcodes found earlier;
* preferably start at VOS (visual object sequence),
* otherwise at VO (video object) */
offset = mp4vparse->vos_offset >= 0 ?
mp4vparse->vos_offset : mp4vparse->vo_offset;
if (offset >= 0) {
gst_mpeg4vparse_process_config (mp4vparse, GST_BUFFER_DATA (buf), off);
/* avoid accepting again for a VOP sc following a GOP sc */
mp4vparse->vos_offset = -1;
mp4vparse->vo_offset = -1;
}
break;
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}
case MPEG4_VOS_STARTCODE:
GST_LOG_OBJECT (mp4vparse, "startcode is VOS");
mp4vparse->vos_offset = off;
break;
default:
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/* VO (video object) cases */
if (code <= 0x1f) {
GST_LOG_OBJECT (mp4vparse, "startcode is VO");
mp4vparse->vo_offset = off;
}
break;
}
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/* at least need to have a VOP in a frame */
return FALSE;
}
/* FIXME move into baseparse, or anything equivalent;
* see https://bugzilla.gnome.org/show_bug.cgi?id=650093 */
#define GST_BASE_PARSE_FRAME_FLAG_PARSING 0x10000
static gboolean
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gst_mpeg4vparse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
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GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEOPARSE (parse);
GstBuffer *buf = frame->buffer;
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
gint off = 0;
gboolean ret;
guint code;
retry:
/* at least start code and subsequent byte */
if (G_UNLIKELY (GST_BUFFER_SIZE (buf) - off < 5))
return FALSE;
/* avoid stale cached parsing state */
if (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_PARSING)) {
GST_LOG_OBJECT (mp4vparse, "parsing new frame");
gst_mpeg4vparse_reset_frame (mp4vparse);
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_PARSING;
} else {
GST_LOG_OBJECT (mp4vparse, "resuming frame parsing");
}
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/* if already found a previous start code, e.g. start of frame, go for next */
if (mp4vparse->last_sc >= 0) {
off = mp4vparse->last_sc;
goto next;
}
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off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffff00, 0x00000100,
off, GST_BUFFER_SIZE (buf) - off);
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GST_LOG_OBJECT (mp4vparse, "possible sync at buffer offset %d", off);
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/* didn't find anything that looks like a sync word, skip */
if (G_UNLIKELY (off < 0)) {
*skipsize = GST_BUFFER_SIZE (buf) - 3;
return FALSE;
}
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/* possible frame header, but not at offset 0? skip bytes before sync */
if (G_UNLIKELY (off > 0)) {
*skipsize = off;
return FALSE;
}
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/* ensure start code looks like a real starting start code */
code = GST_BUFFER_DATA (buf)[3];
switch (code) {
case MPEG4_VOP_STARTCODE:
case MPEG4_VOS_STARTCODE:
case MPEG4_GOP_STARTCODE:
break;
default:
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if (code <= 0x1f)
break;
/* undesirable sc */
GST_LOG_OBJECT (mp4vparse, "start code is no VOS, VO, VOP or GOP");
off++;
goto retry;
}
/* found sc */
mp4vparse->last_sc = 0;
/* examine start code, which should not end frame at present */
gst_mpeg4vparse_process_sc (mp4vparse, buf, 0);
next:
/* start is fine as of now */
*skipsize = 0;
/* position a bit further than last sc */
off++;
/* so now we have start code at start of data; locate next start code */
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffff00, 0x00000100,
off, GST_BUFFER_SIZE (buf) - off);
GST_LOG_OBJECT (mp4vparse, "next start code at %d", off);
if (off < 0) {
/* if draining, take all */
if (GST_BASE_PARSE_DRAINING (parse)) {
off = GST_BUFFER_SIZE (buf);
ret = TRUE;
} else {
/* resume scan where we left it */
mp4vparse->last_sc = GST_BUFFER_SIZE (buf) - 4;
/* request best next available */
*framesize = G_MAXUINT;
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return FALSE;
}
} else {
/* decide whether this startcode ends a frame */
ret = gst_mpeg4vparse_process_sc (mp4vparse, buf, off);
}
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if (ret) {
*framesize = off;
} else {
goto next;
}
return ret;
}
static void
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gst_mpeg4vparse_update_src_caps (GstMpeg4VParse * mp4vparse)
{
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GstCaps *caps = NULL;
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/* only update if no src caps yet or explicitly triggered */
if (G_LIKELY (GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (mp4vparse)) &&
!mp4vparse->update_caps))
return;
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/* carry over input caps as much as possible; override with our own stuff */
caps = GST_PAD_CAPS (GST_BASE_PARSE_SINK_PAD (mp4vparse));
if (caps) {
caps = gst_caps_copy (caps);
} else {
caps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, 4, NULL);
}
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gst_caps_set_simple (caps, "systemstream", G_TYPE_BOOLEAN, FALSE,
"parsed", G_TYPE_BOOLEAN, TRUE, NULL);
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if (mp4vparse->profile != 0) {
gchar *profile = NULL;
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/* FIXME does it make sense to expose the profile in the caps ? */
profile = g_strdup_printf ("%d", mp4vparse->profile);
gst_caps_set_simple (caps, "profile-level-id",
G_TYPE_STRING, profile, NULL);
g_free (profile);
}
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if (mp4vparse->config != NULL) {
gst_caps_set_simple (caps, "codec_data",
GST_TYPE_BUFFER, mp4vparse->config, NULL);
}
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if (mp4vparse->params.width > 0 && mp4vparse->params.height > 0) {
gst_caps_set_simple (caps, "width", G_TYPE_INT, mp4vparse->params.width,
"height", G_TYPE_INT, mp4vparse->params.height, NULL);
}
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/* perhaps we have a framerate */
if (mp4vparse->params.fixed_time_increment != 0) {
gint fps_num = mp4vparse->params.time_increment_resolution;
gint fps_den = mp4vparse->params.fixed_time_increment;
GstClockTime latency = gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
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gst_caps_set_simple (caps, "framerate",
GST_TYPE_FRACTION, fps_num, fps_den, NULL);
gst_base_parse_set_frame_rate (GST_BASE_PARSE (mp4vparse),
fps_num, fps_den, 0, 0);
gst_base_parse_set_latency (GST_BASE_PARSE (mp4vparse), latency, latency);
}
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/* or pixel-aspect-ratio */
if (mp4vparse->params.aspect_ratio_width > 0 &&
mp4vparse->params.aspect_ratio_height > 0) {
gst_caps_set_simple (caps, "pixel-aspect-ratio",
GST_TYPE_FRACTION, mp4vparse->params.aspect_ratio_width,
mp4vparse->params.aspect_ratio_height, NULL);
}
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gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (mp4vparse), caps);
gst_caps_unref (caps);
}
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static GstFlowReturn
gst_mpeg4vparse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
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GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEOPARSE (parse);
GstBuffer *buffer = frame->buffer;
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gst_mpeg4vparse_update_src_caps (mp4vparse);
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if (mp4vparse->intra_frame)
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
if (G_UNLIKELY (mp4vparse->drop && !mp4vparse->config)) {
GST_DEBUG_OBJECT (mp4vparse, "dropping frame as no config yet");
return GST_BASE_PARSE_FLOW_DROPPED;
} else
return GST_FLOW_OK;
}
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static GstFlowReturn
gst_mpeg4vparse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
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GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEOPARSE (parse);
GstBuffer *buffer = frame->buffer;
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/* periodic SPS/PPS sending */
if (mp4vparse->interval > 0) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
guint64 diff;
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/* init */
if (!GST_CLOCK_TIME_IS_VALID (mp4vparse->last_report)) {
mp4vparse->last_report = timestamp;
}
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if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT)) {
if (timestamp > mp4vparse->last_report)
diff = timestamp - mp4vparse->last_report;
else
diff = 0;
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GST_LOG_OBJECT (mp4vparse,
"now %" GST_TIME_FORMAT ", last config %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp), GST_TIME_ARGS (mp4vparse->last_report));
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GST_LOG_OBJECT (mp4vparse,
"interval since last config %" GST_TIME_FORMAT, GST_TIME_ARGS (diff));
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if (GST_TIME_AS_SECONDS (diff) >= mp4vparse->interval) {
/* we need to send config now first */
GST_LOG_OBJECT (parse, "inserting config in stream");
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/* avoid inserting duplicate config */
if ((GST_BUFFER_SIZE (buffer) < GST_BUFFER_SIZE (mp4vparse->config)) ||
memcmp (GST_BUFFER_DATA (buffer),
GST_BUFFER_DATA (mp4vparse->config),
GST_BUFFER_SIZE (mp4vparse->config))) {
GstBuffer *superbuf;
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/* insert header */
superbuf = gst_buffer_merge (mp4vparse->config, buffer);
gst_buffer_copy_metadata (superbuf, buffer, GST_BUFFER_COPY_ALL);
gst_buffer_replace (&frame->buffer, superbuf);
gst_buffer_unref (superbuf);
} else {
GST_LOG_OBJECT (parse, "... but avoiding duplication");
}
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if (G_UNLIKELY (timestamp != -1)) {
mp4vparse->last_report = timestamp;
}
}
}
}
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return GST_FLOW_OK;
}
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static gboolean
gst_mpeg4vparse_set_caps (GstBaseParse * parse, GstCaps * caps)
{
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GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEOPARSE (parse);
GstStructure *s;
const GValue *value;
GstBuffer *buf;
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GST_DEBUG_OBJECT (parse, "setcaps called with %" GST_PTR_FORMAT, caps);
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s = gst_caps_get_structure (caps, 0);
if ((value = gst_structure_get_value (s, "codec_data")) != NULL
&& (buf = gst_value_get_buffer (value))) {
/* best possible parse attempt,
* src caps are based on sink caps so it will end up in there
* whether sucessful or not */
gst_mpeg4vparse_process_config (mp4vparse, GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
}
/* let's not interfere and accept regardless of config parsing success */
return TRUE;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (mpeg4v_parse_debug, "mpeg4videoparse", 0,
"MPEG-4 video parser");
if (!gst_element_register (plugin, "mpeg4videoparse", GST_RANK_SECONDARY,
gst_mpeg4vparse_get_type ()))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mpeg4videoparse",
"MPEG-4 video parser",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)