mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-14 13:21:28 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/videoparsers/gstmpeg4videoparse.c
Olivier Crête 567b1e8c46 videoparsers: Use gst_base_parse_merge_tags() 
Instead of squashing all upstream tags

https://bugzilla.gnome.org/show_bug.cgi?id=679768
2015-08-16 17:28:29 +01:00

994 lines
31 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) <2008> Mindfruit B.V.
* @author Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) <2007> Julien Moutte <julien@fluendo.com>
* Copyright (C) <2011> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) <2011> Nokia Corporation
* Copyright (C) <2011> Intel
* Copyright (C) <2011> Collabora Ltd.
* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/base/base.h>
#include <gst/pbutils/pbutils.h>
#include <gst/video/video.h>
#include "gstmpeg4videoparse.h"
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, "
"width = (int)[ 0, max ], "
"height = (int)[ 0, max ], "
"framerate = (fraction)[ 0, max ] ,"
"parsed = (boolean) true, " "systemstream = (boolean) false; "
"video/x-divx, " "divxversion = (int) [ 4, 5 ]")
);
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) 4, " "systemstream = (boolean) false; "
"video/x-divx, " "divxversion = (int) [ 4, 5 ]")
);
/* Properties */
#define DEFAULT_PROP_DROP TRUE
#define DEFAULT_CONFIG_INTERVAL (0)
enum
{
PROP_0,
PROP_DROP,
PROP_CONFIG_INTERVAL
};
#define gst_mpeg4vparse_parent_class parent_class
G_DEFINE_TYPE (GstMpeg4VParse, gst_mpeg4vparse, GST_TYPE_BASE_PARSE);
static gboolean gst_mpeg4vparse_start (GstBaseParse * parse);
static gboolean gst_mpeg4vparse_stop (GstBaseParse * parse);
static GstFlowReturn gst_mpeg4vparse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, 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);
static GstCaps *gst_mpeg4vparse_get_caps (GstBaseParse * parse,
GstCaps * filter);
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);
static gboolean gst_mpeg4vparse_event (GstBaseParse * parse, GstEvent * event);
static gboolean gst_mpeg4vparse_src_event (GstBaseParse * parse,
GstEvent * event);
static void
gst_mpeg4vparse_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstMpeg4VParse *parse = GST_MPEG4VIDEO_PARSE (object);
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);
}
}
static void
gst_mpeg4vparse_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstMpeg4VParse *parse = GST_MPEG4VIDEO_PARSE (object);
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);
}
}
static void
gst_mpeg4vparse_class_init (GstMpeg4VParseClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_mpeg4vparse_set_property;
gobject_class->get_property = gst_mpeg4vparse_get_property;
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));
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));
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));
gst_element_class_set_static_metadata (element_class,
"MPEG 4 video elementary stream parser", "Codec/Parser/Video",
"Parses MPEG-4 Part 2 elementary video streams",
"Julien Moutte <julien@fluendo.com>");
GST_DEBUG_CATEGORY_INIT (mpeg4v_parse_debug, "mpeg4videoparse", 0,
"MPEG-4 video parser");
/* Override BaseParse vfuncs */
parse_class->start = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_start);
parse_class->stop = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_stop);
parse_class->handle_frame = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_handle_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);
parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_get_caps);
parse_class->sink_event = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_event);
parse_class->src_event = GST_DEBUG_FUNCPTR (gst_mpeg4vparse_src_event);
}
static void
gst_mpeg4vparse_init (GstMpeg4VParse * parse)
{
parse->interval = DEFAULT_CONFIG_INTERVAL;
parse->last_report = GST_CLOCK_TIME_NONE;
gst_base_parse_set_pts_interpolation (GST_BASE_PARSE (parse), FALSE);
GST_PAD_SET_ACCEPT_INTERSECT (GST_BASE_PARSE_SINK_PAD (parse));
GST_PAD_SET_ACCEPT_TEMPLATE (GST_BASE_PARSE_SINK_PAD (parse));
}
static void
gst_mpeg4vparse_reset_frame (GstMpeg4VParse * mp4vparse)
{
/* done parsing; reset state */
mp4vparse->last_sc = -1;
mp4vparse->vop_offset = -1;
mp4vparse->vo_found = FALSE;
mp4vparse->config_found = FALSE;
mp4vparse->vol_offset = -1;
mp4vparse->vo_offset = -1;
}
static void
gst_mpeg4vparse_reset (GstMpeg4VParse * mp4vparse)
{
gst_mpeg4vparse_reset_frame (mp4vparse);
mp4vparse->update_caps = TRUE;
mp4vparse->profile = NULL;
mp4vparse->level = NULL;
mp4vparse->pending_key_unit_ts = GST_CLOCK_TIME_NONE;
mp4vparse->force_key_unit_event = NULL;
mp4vparse->discont = FALSE;
gst_buffer_replace (&mp4vparse->config, NULL);
memset (&mp4vparse->vol, 0, sizeof (mp4vparse->vol));
}
static gboolean
gst_mpeg4vparse_start (GstBaseParse * parse)
{
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GST_DEBUG_OBJECT (parse, "start");
gst_mpeg4vparse_reset (mp4vparse);
/* at least this much for a valid frame */
gst_base_parse_set_min_frame_size (parse, 6);
return TRUE;
}
static gboolean
gst_mpeg4vparse_stop (GstBaseParse * parse)
{
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GST_DEBUG_OBJECT (parse, "stop");
gst_mpeg4vparse_reset (mp4vparse);
return TRUE;
}
static gboolean
gst_mpeg4vparse_process_config (GstMpeg4VParse * mp4vparse,
const guint8 * data, guint offset, gsize size)
{
GstMpeg4VisualObject *vo;
GstMpeg4VideoObjectLayer vol = { 0 };
/* only do stuff if something new */
if (mp4vparse->config
&& gst_buffer_get_size (mp4vparse->config) == size
&& !gst_buffer_memcmp (mp4vparse->config, offset, data, size))
return TRUE;
if (mp4vparse->vol_offset < 0) {
GST_WARNING ("No video object Layer parsed in this frame, cannot accept "
"config");
return FALSE;
}
vo = mp4vparse->vo_found ? &mp4vparse->vo : NULL;
/* If the parsing fail, we accept the config only if we don't have
* any config yet. */
if (gst_mpeg4_parse_video_object_layer (&vol,
vo, data + mp4vparse->vol_offset,
size - mp4vparse->vol_offset) != GST_MPEG4_PARSER_OK &&
mp4vparse->config)
return FALSE;
/* ignore update if nothing meaningful changed */
if (vol.height == mp4vparse->vol.height &&
vol.width == mp4vparse->vol.width &&
vol.vop_time_increment_resolution ==
mp4vparse->vol.vop_time_increment_resolution &&
vol.fixed_vop_time_increment == mp4vparse->vol.fixed_vop_time_increment &&
vol.par_width == mp4vparse->vol.par_width &&
vol.par_height == mp4vparse->vol.par_height &&
vol.sprite_enable == mp4vparse->vol.sprite_enable &&
vol.no_of_sprite_warping_points ==
mp4vparse->vol.no_of_sprite_warping_points)
return TRUE;
mp4vparse->vol = vol;
GST_LOG_OBJECT (mp4vparse, "Width/Height: %u/%u, "
"time increment resolution: %u fixed time increment: %u",
mp4vparse->vol.width, mp4vparse->vol.height,
mp4vparse->vol.vop_time_increment_resolution,
mp4vparse->vol.fixed_vop_time_increment);
GST_LOG_OBJECT (mp4vparse, "accepting parsed config size %" G_GSIZE_FORMAT,
size);
if (mp4vparse->config != NULL)
gst_buffer_unref (mp4vparse->config);
mp4vparse->config = gst_buffer_new_wrapped (g_memdup (data, size), size);
/* trigger src caps update */
mp4vparse->update_caps = TRUE;
return TRUE;
}
/* caller guarantees at least start code in @buf at @off */
static gboolean
gst_mpeg4vparse_process_sc (GstMpeg4VParse * mp4vparse, GstMpeg4Packet * packet,
gsize size)
{
GST_LOG_OBJECT (mp4vparse, "process startcode %x", packet->type);
/* 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 &&
packet->type != GST_MPEG4_VISUAL_OBJ_SEQ_END) {
if (G_LIKELY (size > mp4vparse->vop_offset + 1)) {
mp4vparse->intra_frame =
((packet->data[mp4vparse->vop_offset + 1] >> 6 & 0x3) == 0);
} else {
GST_WARNING_OBJECT (mp4vparse, "no data following VOP startcode");
mp4vparse->intra_frame = FALSE;
}
GST_LOG_OBJECT (mp4vparse, "ending frame of size %d, is intra %d",
packet->offset - 3, mp4vparse->intra_frame);
return TRUE;
}
if (mp4vparse->vo_offset >= 0) {
gst_mpeg4_parse_visual_object (&mp4vparse->vo, NULL,
packet->data + mp4vparse->vo_offset,
packet->offset - 3 - mp4vparse->vo_offset);
mp4vparse->vo_offset = -1;
mp4vparse->vo_found = TRUE;
}
switch (packet->type) {
case GST_MPEG4_VIDEO_OBJ_PLANE:
case GST_MPEG4_GROUP_OF_VOP:
case GST_MPEG4_USER_DATA:
{
if (packet->type == GST_MPEG4_VIDEO_OBJ_PLANE) {
GST_LOG_OBJECT (mp4vparse, "startcode is VOP");
mp4vparse->vop_offset = packet->offset;
} else if (packet->type == GST_MPEG4_GROUP_OF_VOP) {
GST_LOG_OBJECT (mp4vparse, "startcode is GOP");
} else {
GST_LOG_OBJECT (mp4vparse, "startcode is User Data");
}
/* parse config data ending here if proper startcodes found earlier;
* we should have received a visual object before. */
if (mp4vparse->config_found) {
/*Do not take care startcode into account */
gst_mpeg4vparse_process_config (mp4vparse,
packet->data, packet->offset, packet->offset - 3);
mp4vparse->vo_found = FALSE;
}
break;
}
case GST_MPEG4_VISUAL_OBJ_SEQ_START:
GST_LOG_OBJECT (mp4vparse, "Visual Sequence Start");
mp4vparse->config_found = TRUE;
mp4vparse->profile = gst_codec_utils_mpeg4video_get_profile (packet->data
+ packet->offset + 1, packet->offset);
mp4vparse->level = gst_codec_utils_mpeg4video_get_level (packet->data
+ packet->offset + 1, packet->offset);
break;
case GST_MPEG4_VISUAL_OBJ:
GST_LOG_OBJECT (mp4vparse, "Visual Object");
mp4vparse->vo_offset = packet->offset;
break;
default:
if (packet->type >= GST_MPEG4_VIDEO_LAYER_FIRST &&
packet->type <= GST_MPEG4_VIDEO_LAYER_LAST) {
GST_LOG_OBJECT (mp4vparse, "Video Object Layer");
/* we keep track of the offset to parse later on */
if (mp4vparse->vol_offset < 0)
mp4vparse->vol_offset = packet->offset;
/* Video Object below is merely a start code,
* if that is considered as config, then certainly Video Object Layer
* which really contains some needed data */
mp4vparse->config_found = TRUE;
/* VO (video object) cases */
} else if (packet->type <= GST_MPEG4_VIDEO_OBJ_LAST) {
GST_LOG_OBJECT (mp4vparse, "Video object");
mp4vparse->config_found = TRUE;
}
break;
}
/* at least need to have a VOP in a frame */
return FALSE;
}
static GstFlowReturn
gst_mpeg4vparse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GstMpeg4Packet packet;
GstMapInfo map;
guint8 *data = NULL;
gsize size;
gint off = 0;
gboolean ret = FALSE;
guint framesize = 0;
if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (frame->buffer,
GST_BUFFER_FLAG_DISCONT))) {
mp4vparse->discont = TRUE;
}
gst_buffer_map (frame->buffer, &map, GST_MAP_READ);
data = map.data;
size = map.size;
retry:
/* at least start code and subsequent byte */
if (G_UNLIKELY (size - off < 5)) {
*skipsize = 1;
goto out;
}
/* avoid stale cached parsing state */
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME) {
GST_LOG_OBJECT (mp4vparse, "parsing new frame");
gst_mpeg4vparse_reset_frame (mp4vparse);
} else {
GST_LOG_OBJECT (mp4vparse, "resuming frame parsing");
}
/* 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;
}
/* didn't find anything that looks like a sync word, skip */
switch (gst_mpeg4_parse (&packet, FALSE, NULL, data, off, size)) {
case (GST_MPEG4_PARSER_NO_PACKET):
case (GST_MPEG4_PARSER_ERROR):
*skipsize = size - 3;
goto out;
default:
break;
}
off = packet.offset;
/* possible frame header, but not at offset 0? skip bytes before sync */
if (G_UNLIKELY (off > 3)) {
*skipsize = off - 3;
goto out;
}
switch (packet.type) {
case GST_MPEG4_GROUP_OF_VOP:
case GST_MPEG4_VISUAL_OBJ_SEQ_START:
case GST_MPEG4_VIDEO_OBJ_PLANE:
break;
default:
if (packet.type <= GST_MPEG4_VIDEO_OBJ_LAST)
break;
if (packet.type >= GST_MPEG4_VIDEO_LAYER_FIRST &&
packet.type <= GST_MPEG4_VIDEO_LAYER_LAST)
break;
/* undesirable sc */
GST_LOG_OBJECT (mp4vparse, "start code is no VOS, VO, VOL, VOP or GOP");
goto retry;
}
/* found sc */
mp4vparse->last_sc = 0;
/* examine start code, which should not end frame at present */
gst_mpeg4vparse_process_sc (mp4vparse, &packet, size);
next:
GST_LOG_OBJECT (mp4vparse, "Looking for frame end");
/* 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 packet */
switch (gst_mpeg4_parse (&packet, FALSE, NULL, data, off, size)) {
case (GST_MPEG4_PARSER_NO_PACKET_END):
ret = gst_mpeg4vparse_process_sc (mp4vparse, &packet, size);
if (ret)
break;
case (GST_MPEG4_PARSER_NO_PACKET):
case (GST_MPEG4_PARSER_ERROR):
/* if draining, take all */
if (GST_BASE_PARSE_DRAINING (parse)) {
framesize = size;
ret = TRUE;
} else {
/* resume scan where we left it */
mp4vparse->last_sc = size - 3;
}
goto out;
default:
/* decide whether this startcode ends a frame */
ret = gst_mpeg4vparse_process_sc (mp4vparse, &packet, size);
break;
}
off = packet.offset;
if (ret) {
framesize = off - 3;
} else {
goto next;
}
out:
gst_buffer_unmap (frame->buffer, &map);
if (ret) {
GstFlowReturn res;
g_assert (framesize <= map.size);
res = gst_mpeg4vparse_parse_frame (parse, frame);
if (res == GST_BASE_PARSE_FLOW_DROPPED)
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_DROP;
if (G_UNLIKELY (mp4vparse->discont)) {
GST_BUFFER_FLAG_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
mp4vparse->discont = FALSE;
}
return gst_base_parse_finish_frame (parse, frame, framesize);
}
return GST_FLOW_OK;
}
static void
gst_mpeg4vparse_update_src_caps (GstMpeg4VParse * mp4vparse)
{
GstCaps *caps = NULL;
GstStructure *s = NULL;
/* only update if no src caps yet or explicitly triggered */
if (G_LIKELY (gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (mp4vparse)) &&
!mp4vparse->update_caps))
return;
GST_LOG_OBJECT (mp4vparse, "Updating caps");
/* carry over input caps as much as possible; override with our own stuff */
caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (mp4vparse));
if (caps) {
GstCaps *tmp = gst_caps_copy (caps);
gst_caps_unref (caps);
caps = tmp;
s = gst_caps_get_structure (caps, 0);
} else {
caps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, 4,
"systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
}
gst_caps_set_simple (caps, "parsed", G_TYPE_BOOLEAN, TRUE, NULL);
if (mp4vparse->profile && mp4vparse->level) {
gst_caps_set_simple (caps, "profile", G_TYPE_STRING, mp4vparse->profile,
"level", G_TYPE_STRING, mp4vparse->level, NULL);
}
if (mp4vparse->config != NULL) {
gst_caps_set_simple (caps, "codec_data",
GST_TYPE_BUFFER, mp4vparse->config, NULL);
}
if (mp4vparse->vol.width > 0 && mp4vparse->vol.height > 0) {
gst_caps_set_simple (caps, "width", G_TYPE_INT, mp4vparse->vol.width,
"height", G_TYPE_INT, mp4vparse->vol.height, NULL);
}
/* perhaps we have a framerate */
{
gint fps_num = mp4vparse->vol.vop_time_increment_resolution;
gint fps_den = mp4vparse->vol.fixed_vop_time_increment;
GstClockTime latency;
/* upstream overrides */
if (s && gst_structure_has_field (s, "framerate"))
gst_structure_get_fraction (s, "framerate", &fps_num, &fps_den);
if (fps_den > 0 && fps_num > 0) {
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);
latency = gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
gst_base_parse_set_latency (GST_BASE_PARSE (mp4vparse), latency, latency);
}
}
/* or pixel-aspect-ratio */
if (mp4vparse->vol.par_width > 0 && mp4vparse->vol.par_height > 0 &&
(!s || !gst_structure_has_field (s, "pixel-aspect-ratio"))) {
gst_caps_set_simple (caps, "pixel-aspect-ratio",
GST_TYPE_FRACTION, mp4vparse->vol.par_width,
mp4vparse->vol.par_height, NULL);
}
if (mp4vparse->vol.sprite_enable != GST_MPEG4_SPRITE_UNUSED)
gst_caps_set_simple (caps, "sprite-warping-points", G_TYPE_INT,
mp4vparse->vol.no_of_sprite_warping_points, NULL);
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (mp4vparse), caps);
gst_caps_unref (caps);
mp4vparse->update_caps = FALSE;
}
static GstFlowReturn
gst_mpeg4vparse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GstBuffer *buffer = frame->buffer;
gst_mpeg4vparse_update_src_caps (mp4vparse);
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_LOG_OBJECT (mp4vparse, "dropping frame as no config yet");
return GST_BASE_PARSE_FLOW_DROPPED;
} else
return GST_FLOW_OK;
}
static GstEvent *
check_pending_key_unit_event (GstEvent * pending_event, GstSegment * segment,
GstClockTime timestamp, guint flags, GstClockTime pending_key_unit_ts)
{
GstClockTime running_time, stream_time;
gboolean all_headers;
guint count;
GstEvent *event = NULL;
g_return_val_if_fail (segment != NULL, NULL);
if (pending_event == NULL)
goto out;
if (GST_CLOCK_TIME_IS_VALID (pending_key_unit_ts) &&
timestamp == GST_CLOCK_TIME_NONE)
goto out;
running_time = gst_segment_to_running_time (segment,
GST_FORMAT_TIME, timestamp);
GST_INFO ("now %" GST_TIME_FORMAT " wanted %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time), GST_TIME_ARGS (pending_key_unit_ts));
if (GST_CLOCK_TIME_IS_VALID (pending_key_unit_ts) &&
running_time < pending_key_unit_ts)
goto out;
if (flags & GST_BUFFER_FLAG_DELTA_UNIT) {
GST_DEBUG ("pending force key unit, waiting for keyframe");
goto out;
}
stream_time = gst_segment_to_stream_time (segment,
GST_FORMAT_TIME, timestamp);
gst_video_event_parse_upstream_force_key_unit (pending_event,
NULL, &all_headers, &count);
event =
gst_video_event_new_downstream_force_key_unit (timestamp, stream_time,
running_time, all_headers, count);
gst_event_set_seqnum (event, gst_event_get_seqnum (pending_event));
out:
return event;
}
static void
gst_mpeg4vparse_prepare_key_unit (GstMpeg4VParse * parse, GstEvent * event)
{
GstClockTime running_time;
guint count;
parse->pending_key_unit_ts = GST_CLOCK_TIME_NONE;
gst_event_replace (&parse->force_key_unit_event, NULL);
gst_video_event_parse_downstream_force_key_unit (event,
NULL, NULL, &running_time, NULL, &count);
GST_INFO_OBJECT (parse, "pushing downstream force-key-unit event %d "
"%" GST_TIME_FORMAT " count %d", gst_event_get_seqnum (event),
GST_TIME_ARGS (running_time), count);
gst_pad_push_event (GST_BASE_PARSE_SRC_PAD (parse), event);
}
static GstFlowReturn
gst_mpeg4vparse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GstBuffer *buffer = frame->buffer;
gboolean push_codec = FALSE;
GstEvent *event = NULL;
if (!mp4vparse->sent_codec_tag) {
GstTagList *taglist;
GstCaps *caps;
taglist = gst_tag_list_new_empty ();
/* codec tag */
caps = gst_pad_get_current_caps (GST_BASE_PARSE_SRC_PAD (parse));
gst_pb_utils_add_codec_description_to_tag_list (taglist,
GST_TAG_VIDEO_CODEC, caps);
gst_caps_unref (caps);
gst_base_parse_merge_tags (parse, taglist, GST_TAG_MERGE_REPLACE);
gst_tag_list_unref (taglist);
/* also signals the end of first-frame processing */
mp4vparse->sent_codec_tag = TRUE;
}
if ((event = check_pending_key_unit_event (mp4vparse->force_key_unit_event,
&parse->segment, GST_BUFFER_TIMESTAMP (buffer),
GST_BUFFER_FLAGS (buffer), mp4vparse->pending_key_unit_ts))) {
gst_mpeg4vparse_prepare_key_unit (mp4vparse, event);
push_codec = TRUE;
}
/* periodic config sending */
if (mp4vparse->interval > 0 || push_codec) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
guint64 diff;
/* init */
if (!GST_CLOCK_TIME_IS_VALID (mp4vparse->last_report)) {
mp4vparse->last_report = timestamp;
}
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;
GST_LOG_OBJECT (mp4vparse,
"now %" GST_TIME_FORMAT ", last config %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp), GST_TIME_ARGS (mp4vparse->last_report));
GST_LOG_OBJECT (mp4vparse,
"interval since last config %" GST_TIME_FORMAT, GST_TIME_ARGS (diff));
if (GST_TIME_AS_SECONDS (diff) >= mp4vparse->interval || push_codec) {
GstMapInfo cmap;
gsize csize;
gboolean diffconf;
/* we need to send config now first */
GST_INFO_OBJECT (parse, "inserting config in stream");
gst_buffer_map (mp4vparse->config, &cmap, GST_MAP_READ);
diffconf = (gst_buffer_get_size (buffer) < cmap.size)
|| gst_buffer_memcmp (buffer, 0, cmap.data, cmap.size);
csize = cmap.size;
gst_buffer_unmap (mp4vparse->config, &cmap);
/* avoid inserting duplicate config */
if (diffconf) {
GstBuffer *superbuf;
/* insert header */
superbuf =
gst_buffer_append (gst_buffer_ref (mp4vparse->config),
gst_buffer_ref (buffer));
gst_buffer_copy_into (superbuf, buffer, GST_BUFFER_COPY_METADATA, 0,
csize);
gst_buffer_replace (&frame->out_buffer, superbuf);
gst_buffer_unref (superbuf);
} else {
GST_INFO_OBJECT (parse, "... but avoiding duplication");
}
if (G_UNLIKELY (timestamp != -1)) {
mp4vparse->last_report = timestamp;
}
}
}
}
return GST_FLOW_OK;
}
static gboolean
gst_mpeg4vparse_set_caps (GstBaseParse * parse, GstCaps * caps)
{
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GstStructure *s;
const GValue *value;
GstBuffer *buf;
GstMapInfo map;
guint8 *data;
gsize size;
GstMpeg4Packet packet;
GstMpeg4ParseResult res;
GST_DEBUG_OBJECT (parse, "setcaps called with %" GST_PTR_FORMAT, caps);
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_buffer_map (buf, &map, GST_MAP_READ);
data = map.data;
size = map.size;
res = gst_mpeg4_parse (&packet, FALSE, NULL, data, 0, size);
while (res == GST_MPEG4_PARSER_OK || res == GST_MPEG4_PARSER_NO_PACKET_END) {
if (packet.type >= GST_MPEG4_VIDEO_LAYER_FIRST &&
packet.type <= GST_MPEG4_VIDEO_LAYER_LAST)
mp4vparse->vol_offset = packet.offset;
else if (packet.type == GST_MPEG4_VISUAL_OBJ) {
gst_mpeg4_parse_visual_object (&mp4vparse->vo, NULL,
data + packet.offset, MIN (packet.size, size));
mp4vparse->vo_found = TRUE;
}
res = gst_mpeg4_parse (&packet, FALSE, NULL, data, packet.offset, size);
}
/* And take it as config */
gst_mpeg4vparse_process_config (mp4vparse, data, 3, size);
gst_buffer_unmap (buf, &map);
gst_mpeg4vparse_reset_frame (mp4vparse);
}
/* let's not interfere and accept regardless of config parsing success */
return TRUE;
}
static void
remove_fields (GstCaps * caps)
{
guint i, n;
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (caps, i);
gst_structure_remove_field (s, "parsed");
}
}
static GstCaps *
gst_mpeg4vparse_get_caps (GstBaseParse * parse, GstCaps * filter)
{
GstCaps *peercaps, *templ;
GstCaps *res;
templ = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD (parse));
if (filter) {
GstCaps *fcopy = gst_caps_copy (filter);
/* Remove the fields we convert */
remove_fields (fcopy);
peercaps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), fcopy);
gst_caps_unref (fcopy);
} else
peercaps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), NULL);
if (peercaps) {
/* Remove the parsed field */
peercaps = gst_caps_make_writable (peercaps);
remove_fields (peercaps);
res = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (peercaps);
gst_caps_unref (templ);
} else {
res = templ;
}
if (filter) {
GstCaps *tmp = gst_caps_intersect_full (res, filter,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (res);
res = tmp;
}
return res;
}
static gboolean
gst_mpeg4vparse_event (GstBaseParse * parse, GstEvent * event)
{
gboolean res;
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_DOWNSTREAM:
{
GstClockTime timestamp, stream_time, running_time;
gboolean all_headers;
guint count;
if (gst_video_event_is_force_key_unit (event)) {
gst_video_event_parse_downstream_force_key_unit (event,
&timestamp, &stream_time, &running_time, &all_headers, &count);
GST_INFO_OBJECT (mp4vparse, "received downstream force key unit event, "
"seqnum %d running_time %" GST_TIME_FORMAT
" all_headers %d count %d", gst_event_get_seqnum (event),
GST_TIME_ARGS (running_time), all_headers, count);
if (mp4vparse->force_key_unit_event) {
GST_INFO_OBJECT (mp4vparse, "ignoring force key unit event "
"as one is already queued");
} else {
mp4vparse->pending_key_unit_ts = running_time;
gst_event_replace (&mp4vparse->force_key_unit_event, event);
}
gst_event_unref (event);
res = TRUE;
} else {
res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
}
break;
}
default:
res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
break;
}
return res;
}
static gboolean
gst_mpeg4vparse_src_event (GstBaseParse * parse, GstEvent * event)
{
gboolean res;
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
{
GstClockTime running_time;
gboolean all_headers;
guint count;
if (gst_video_event_is_force_key_unit (event)) {
gst_video_event_parse_upstream_force_key_unit (event,
&running_time, &all_headers, &count);
GST_INFO_OBJECT (mp4vparse, "received upstream force-key-unit event, "
"seqnum %d running_time %" GST_TIME_FORMAT
" all_headers %d count %d", gst_event_get_seqnum (event),
GST_TIME_ARGS (running_time), all_headers, count);
if (all_headers) {
mp4vparse->pending_key_unit_ts = running_time;
gst_event_replace (&mp4vparse->force_key_unit_event, event);
}
}
res = GST_BASE_PARSE_CLASS (parent_class)->src_event (parse, event);
break;
}
default:
res = GST_BASE_PARSE_CLASS (parent_class)->src_event (parse, event);
break;
}
return res;
}
Reference in a new issue View git blame Copy permalink