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gstreamer/gst/videoparsers/gstmpegvideoparse.c
Edward Hervey 1db3d40a4b mpegvideoparse: Only map input buffer once 
Instead of constantly map/unmapping it a bit everywhere, we pass along
to all functions the GstMapInfo.

Makes mpeg video frame parsing 6% faster

https://bugzilla.gnome.org/show_bug.cgi?id=702330
2013-07-22 10:46:23 +02:00

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/* GStreamer
* Copyright (C) <2007> Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) <2011> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.com>
* Copyright (C) <2011> Collabora ltd
* Copyright (C) <2011> Nokia Corporation
* Copyright (C) <2011> Intel 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/base/gstbytereader.h>
#include <gst/codecparsers/gstmpegvideometa.h>
#include "gstmpegvideoparse.h"
GST_DEBUG_CATEGORY (mpegv_parse_debug);
#define GST_CAT_DEFAULT mpegv_parse_debug
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) [1, 2], "
"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) [1, 2], " "systemstream = (boolean) false")
);
/* Properties */
#define DEFAULT_PROP_DROP TRUE
#define DEFAULT_PROP_GOP_SPLIT FALSE
enum
{
PROP_0,
PROP_DROP,
PROP_GOP_SPLIT,
PROP_LAST
};
#define parent_class gst_mpegv_parse_parent_class
G_DEFINE_TYPE (GstMpegvParse, gst_mpegv_parse, GST_TYPE_BASE_PARSE);
static gboolean gst_mpegv_parse_start (GstBaseParse * parse);
static gboolean gst_mpegv_parse_stop (GstBaseParse * parse);
static GstFlowReturn gst_mpegv_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize);
static GstFlowReturn gst_mpegv_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_mpegv_parse_set_caps (GstBaseParse * parse, GstCaps * caps);
static GstCaps *gst_mpegv_parse_get_caps (GstBaseParse * parse,
GstCaps * filter);
static GstFlowReturn gst_mpegv_parse_pre_push_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_mpegv_parse_sink_query (GstBaseParse * parse,
GstQuery * query);
static void gst_mpegv_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mpegv_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
gst_mpegv_parse_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstMpegvParse *parse = GST_MPEGVIDEO_PARSE (object);
switch (property_id) {
case PROP_DROP:
parse->drop = g_value_get_boolean (value);
break;
case PROP_GOP_SPLIT:
parse->gop_split = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
gst_mpegv_parse_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstMpegvParse *parse = GST_MPEGVIDEO_PARSE (object);
switch (property_id) {
case PROP_DROP:
g_value_set_boolean (value, parse->drop);
break;
case PROP_GOP_SPLIT:
g_value_set_boolean (value, parse->gop_split);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
gst_mpegv_parse_class_init (GstMpegvParseClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (mpegv_parse_debug, "mpegvideoparse", 0,
"MPEG-1/2 video parser");
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_mpegv_parse_set_property;
gobject_class->get_property = gst_mpegv_parse_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_GOP_SPLIT,
g_param_spec_boolean ("gop-split", "gop-split",
"Split frame when encountering GOP", DEFAULT_PROP_GOP_SPLIT,
G_PARAM_CONSTRUCT | 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 video elementary stream parser",
"Codec/Parser/Video",
"Parses and frames MPEG-1 and MPEG-2 elementary video streams",
"Wim Taymans <wim.taymans@ccollabora.co.uk>, "
"Jan Schmidt <thaytan@mad.scientist.com>, "
"Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>");
/* Override BaseParse vfuncs */
parse_class->start = GST_DEBUG_FUNCPTR (gst_mpegv_parse_start);
parse_class->stop = GST_DEBUG_FUNCPTR (gst_mpegv_parse_stop);
parse_class->handle_frame = GST_DEBUG_FUNCPTR (gst_mpegv_parse_handle_frame);
parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_mpegv_parse_set_caps);
parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_mpegv_parse_get_caps);
parse_class->pre_push_frame =
GST_DEBUG_FUNCPTR (gst_mpegv_parse_pre_push_frame);
parse_class->sink_query = GST_DEBUG_FUNCPTR (gst_mpegv_parse_sink_query);
}
static void
gst_mpegv_parse_init (GstMpegvParse * parse)
{
parse->config_flags = FLAG_NONE;
gst_base_parse_set_pts_interpolation (GST_BASE_PARSE (parse), FALSE);
}
static void
gst_mpegv_parse_reset_frame (GstMpegvParse * mpvparse)
{
/* done parsing; reset state */
mpvparse->last_sc = -1;
mpvparse->seq_size = 0;
mpvparse->seq_offset = -1;
mpvparse->pic_offset = -1;
mpvparse->frame_repeat_count = 0;
memset (mpvparse->ext_offsets, 0, sizeof (mpvparse->ext_offsets));
mpvparse->ext_count = 0;
mpvparse->slice_count = 0;
mpvparse->slice_offset = 0;
}
static void
gst_mpegv_parse_reset (GstMpegvParse * mpvparse)
{
gst_mpegv_parse_reset_frame (mpvparse);
mpvparse->profile = 0;
mpvparse->update_caps = TRUE;
mpvparse->send_codec_tag = TRUE;
mpvparse->send_mpeg_meta = TRUE;
gst_buffer_replace (&mpvparse->config, NULL);
memset (&mpvparse->sequencehdr, 0, sizeof (mpvparse->sequencehdr));
memset (&mpvparse->sequenceext, 0, sizeof (mpvparse->sequenceext));
memset (&mpvparse->sequencedispext, 0, sizeof (mpvparse->sequencedispext));
memset (&mpvparse->pichdr, 0, sizeof (mpvparse->pichdr));
memset (&mpvparse->picext, 0, sizeof (mpvparse->picext));
mpvparse->seqhdr_updated = FALSE;
mpvparse->seqext_updated = FALSE;
mpvparse->seqdispext_updated = FALSE;
mpvparse->picext_updated = FALSE;
mpvparse->quantmatrext_updated = FALSE;
}
static gboolean
gst_mpegv_parse_sink_query (GstBaseParse * parse, GstQuery * query)
{
gboolean res;
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
res = GST_BASE_PARSE_CLASS (parent_class)->sink_query (parse, query);
if (res && GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION) {
mpvparse->send_mpeg_meta =
gst_query_find_allocation_meta (query, GST_MPEG_VIDEO_META_API_TYPE,
NULL);
GST_DEBUG_OBJECT (parse, "Downstream can handle GstMpegVideo GstMeta : %d",
mpvparse->send_mpeg_meta);
}
return res;
}
static gboolean
gst_mpegv_parse_start (GstBaseParse * parse)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GST_DEBUG_OBJECT (parse, "start");
gst_mpegv_parse_reset (mpvparse);
/* at least this much for a valid frame */
gst_base_parse_set_min_frame_size (parse, 6);
return TRUE;
}
static gboolean
gst_mpegv_parse_stop (GstBaseParse * parse)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GST_DEBUG_OBJECT (parse, "stop");
gst_mpegv_parse_reset (mpvparse);
return TRUE;
}
static gboolean
gst_mpegv_parse_process_config (GstMpegvParse * mpvparse, GstMapInfo * info,
guint size)
{
GstMpegVideoPacket packet;
guint8 *data_with_prefix;
gint i;
if (mpvparse->seq_offset < 4) {
/* This shouldn't happen, but just in case... */
GST_WARNING_OBJECT (mpvparse, "Sequence header start code missing.");
return FALSE;
}
packet.data = info->data;
packet.type = GST_MPEG_VIDEO_PACKET_SEQUENCE;
packet.offset = mpvparse->seq_offset;
packet.size = size - mpvparse->seq_offset;
/* pointer to sequence header data including the start code prefix -
used for codec private data */
data_with_prefix = (guint8 *) packet.data + packet.offset - 4;
/* only do stuff if something new; only compare first 11 bytes, changes in
quantiser matrix doesn't matter here. Also changing the matrices in
codec_data seems to cause problem with decoders */
if (mpvparse->config &&
gst_buffer_memcmp (mpvparse->config, 0, data_with_prefix, MIN (size,
11)) == 0) {
return TRUE;
}
if (!gst_mpeg_video_packet_parse_sequence_header (&packet,
&mpvparse->sequencehdr)) {
GST_DEBUG_OBJECT (mpvparse,
"failed to parse config data (size %d) at offset %d",
size, mpvparse->seq_offset);
return FALSE;
}
mpvparse->seqhdr_updated = TRUE;
GST_LOG_OBJECT (mpvparse, "accepting parsed config size %d", size);
/* Set mpeg version, and parse sequence extension */
mpvparse->config_flags = FLAG_NONE;
for (i = 0; i < mpvparse->ext_count; ++i) {
packet.type = GST_MPEG_VIDEO_PACKET_EXTENSION;
packet.offset = mpvparse->ext_offsets[i];
packet.size = (gint) size - mpvparse->ext_offsets[i];
mpvparse->config_flags |= FLAG_MPEG2;
if (packet.size > 1) {
switch (packet.data[packet.offset] >> 4) {
case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE:
if (gst_mpeg_video_packet_parse_sequence_extension (&packet,
&mpvparse->sequenceext)) {
GST_LOG_OBJECT (mpvparse, "Read Sequence Extension");
mpvparse->config_flags |= FLAG_SEQUENCE_EXT;
mpvparse->seqext_updated = TRUE;
}
break;
case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_DISPLAY:
if (gst_mpeg_video_packet_parse_sequence_display_extension (&packet,
&mpvparse->sequencedispext)) {
GST_LOG_OBJECT (mpvparse, "Read Sequence Display Extension");
mpvparse->config_flags |= FLAG_SEQUENCE_DISPLAY_EXT;
mpvparse->seqdispext_updated = TRUE;
}
break;
case GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX:
if (gst_mpeg_video_packet_parse_quant_matrix_extension (&packet,
&mpvparse->quantmatrext)) {
GST_LOG_OBJECT (mpvparse, "Read Quantization Matrix Extension");
mpvparse->quantmatrext_updated = TRUE;
}
break;
}
}
}
if (mpvparse->config_flags & FLAG_MPEG2) {
/* Update the sequence header based on extensions */
GstMpegVideoSequenceExt *seqext = NULL;
GstMpegVideoSequenceDisplayExt *seqdispext = NULL;
if (mpvparse->config_flags & FLAG_SEQUENCE_EXT)
seqext = &mpvparse->sequenceext;
if (mpvparse->config_flags & FLAG_SEQUENCE_DISPLAY_EXT)
seqdispext = &mpvparse->sequencedispext;
gst_mpeg_video_finalise_mpeg2_sequence_header (&mpvparse->sequencehdr,
seqext, seqdispext);
}
if (mpvparse->fps_num == 0 || mpvparse->fps_den == 0) {
mpvparse->fps_num = mpvparse->sequencehdr.fps_n;
mpvparse->fps_den = mpvparse->sequencehdr.fps_d;
}
/* parsing ok, so accept it as new config */
if (mpvparse->config != NULL)
gst_buffer_unref (mpvparse->config);
mpvparse->config = gst_buffer_new_and_alloc (size);
gst_buffer_fill (mpvparse->config, 0, data_with_prefix, size);
/* trigger src caps update */
mpvparse->update_caps = TRUE;
return TRUE;
}
/* FIXME : Move these functions to libgstcodecparser for usage by
* more elements/code */
#ifndef GST_DISABLE_GST_DEBUG
static const gchar *
picture_start_code_name (guint8 psc)
{
guint i;
const struct
{
guint8 psc;
const gchar *name;
} psc_names[] = {
{
0x00, "Picture Start"}, {
0xb0, "Reserved"}, {
0xb1, "Reserved"}, {
0xb2, "User Data Start"}, {
0xb3, "Sequence Header Start"}, {
0xb4, "Sequence Error"}, {
0xb5, "Extension Start"}, {
0xb6, "Reserved"}, {
0xb7, "Sequence End"}, {
0xb8, "Group Start"}, {
0xb9, "Program End"}
};
if (psc < 0xB0 && psc > 0)
return "Slice Start";
for (i = 0; i < G_N_ELEMENTS (psc_names); i++)
if (psc_names[i].psc == psc)
return psc_names[i].name;
return "UNKNOWN";
};
static const gchar *
picture_type_name (guint8 pct)
{
guint i;
const struct
{
guint8 pct;
const gchar *name;
} pct_names[] = {
{
0, "Forbidden"}, {
1, "I Frame"}, {
2, "P Frame"}, {
3, "B Frame"}, {
4, "DC Intra Coded (Shall Not Be Used!)"}
};
for (i = 0; i < G_N_ELEMENTS (pct_names); i++)
if (pct_names[i].pct == pct)
return pct_names[i].name;
return "Reserved/Unknown";
}
#endif /* GST_DISABLE_GST_DEBUG */
static void
parse_packet_extension (GstMpegvParse * mpvparse, GstMapInfo * info, guint off)
{
GstMpegVideoPacket packet;
packet.data = info->data;
packet.type = GST_MPEG_VIDEO_PACKET_EXTENSION;
packet.offset = off;
packet.size = info->size - off;
/* FIXME : WE ARE ASSUMING IT IS A *PICTURE* EXTENSION */
if (gst_mpeg_video_packet_parse_picture_extension (&packet,
&mpvparse->picext)) {
mpvparse->frame_repeat_count = 1;
if (mpvparse->picext.repeat_first_field) {
if (mpvparse->sequenceext.progressive) {
if (mpvparse->picext.top_field_first)
mpvparse->frame_repeat_count = 5;
else
mpvparse->frame_repeat_count = 3;
} else if (mpvparse->picext.progressive_frame) {
mpvparse->frame_repeat_count = 2;
}
}
mpvparse->picext_updated = TRUE;
}
}
/* caller guarantees at least start code in @buf at @off */
/* for off == 4 initial code; returns TRUE if code starts a frame
* otherwise returns TRUE if code terminates preceding frame */
static gboolean
gst_mpegv_parse_process_sc (GstMpegvParse * mpvparse,
GstMapInfo * info, gint off, GstMpegVideoPacket * packet)
{
gboolean ret = FALSE, checkconfig = TRUE;
GST_LOG_OBJECT (mpvparse, "process startcode %x (%s) offset:%d", packet->type,
picture_start_code_name (packet->type), off);
switch (packet->type) {
case GST_MPEG_VIDEO_PACKET_PICTURE:
GST_LOG_OBJECT (mpvparse, "startcode is PICTURE");
/* picture is aggregated with preceding sequence/gop, if any.
* so, picture start code only ends if already a previous one */
if (mpvparse->pic_offset < 0)
mpvparse->pic_offset = off;
else
ret = (off != mpvparse->pic_offset);
/* but it's a valid starting one */
if (off == 4)
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_SEQUENCE:
GST_LOG_OBJECT (mpvparse, "startcode is SEQUENCE");
if (mpvparse->seq_offset < 0)
mpvparse->seq_offset = off;
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_GOP:
GST_LOG_OBJECT (mpvparse, "startcode is GOP");
if (mpvparse->seq_offset >= 0)
ret = mpvparse->gop_split;
else
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_EXTENSION:
GST_LOG_OBJECT (mpvparse, "startcode is VIDEO PACKET EXTENSION");
parse_packet_extension (mpvparse, info, off);
if (mpvparse->ext_count < G_N_ELEMENTS (mpvparse->ext_offsets))
mpvparse->ext_offsets[mpvparse->ext_count++] = off;
checkconfig = FALSE;
break;
default:
if (GST_MPEG_VIDEO_PACKET_IS_SLICE (packet->type)) {
mpvparse->slice_count++;
if (mpvparse->slice_offset == 0)
mpvparse->slice_offset = off - 4;
}
checkconfig = FALSE;
break;
}
/* set size to avoid processing config again */
if (checkconfig && mpvparse->seq_offset >= 0 && off != mpvparse->seq_offset &&
!mpvparse->seq_size) {
/* should always be at start */
g_assert (mpvparse->seq_offset <= 4);
gst_mpegv_parse_process_config (mpvparse, info, off - mpvparse->seq_offset);
mpvparse->seq_size = off - mpvparse->seq_offset;
}
/* extract some picture info if there is any in the frame being terminated */
if (ret && mpvparse->pic_offset >= 0 && mpvparse->pic_offset < off) {
GstMpegVideoPacket header;
header.data = info->data;
header.type = GST_MPEG_VIDEO_PACKET_PICTURE;
header.offset = mpvparse->pic_offset;
header.size = info->size - mpvparse->pic_offset;
if (gst_mpeg_video_packet_parse_picture_header (&header, &mpvparse->pichdr))
GST_LOG_OBJECT (mpvparse, "picture_coding_type %d (%s), ending"
"frame of size %d", mpvparse->pichdr.pic_type,
picture_type_name (mpvparse->pichdr.pic_type), off - 4);
else
GST_LOG_OBJECT (mpvparse, "Couldn't parse picture at offset %d",
mpvparse->pic_offset);
}
return ret;
}
/* 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 inline void
update_frame_parsing_status (GstMpegvParse * mpvparse,
GstBaseParseFrame * frame)
{
/* avoid stale cached parsing state */
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME) {
GST_LOG_OBJECT (mpvparse, "parsing new frame");
gst_mpegv_parse_reset_frame (mpvparse);
} else {
GST_LOG_OBJECT (mpvparse, "resuming frame parsing");
}
}
static GstFlowReturn
gst_mpegv_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstFlowReturn flowret = GST_FLOW_OK;
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstBuffer *buf = frame->buffer;
gboolean ret = FALSE;
gint off = 0;
GstMpegVideoPacket packet;
guint8 *data;
gint size;
GstMapInfo map;
update_frame_parsing_status (mpvparse, frame);
gst_buffer_map (buf, &map, GST_MAP_READ);
data = map.data;
size = map.size;
retry:
/* at least start code and subsequent byte */
if (G_UNLIKELY (size < 5 + off))
goto exit;
/* if already found a previous start code, e.g. start of frame, go for next */
if (mpvparse->last_sc >= 0) {
off = packet.offset = mpvparse->last_sc;
packet.size = 0;
goto next;
}
if (!gst_mpeg_video_parse (&packet, data, size, off)) {
/* didn't find anything that looks like a sync word, skip */
GST_LOG_OBJECT (mpvparse, "no start code found");
*skipsize = size - 3;
goto exit;
}
off = packet.offset - 4;
GST_LOG_OBJECT (mpvparse, "possible sync at buffer offset %d", off);
/* possible frame header, but not at offset 0? skip bytes before sync */
if (G_UNLIKELY (off > 0)) {
*skipsize = off;
goto exit;
}
/* note: initial start code is assumed at offset 0 by subsequent code */
/* examine start code, see if it looks like an initial start code */
if (gst_mpegv_parse_process_sc (mpvparse, &map, 4, &packet)) {
/* found sc */
GST_LOG_OBJECT (mpvparse, "valid start code found");
mpvparse->last_sc = 0;
} else {
off++;
gst_mpegv_parse_reset_frame (mpvparse);
GST_LOG_OBJECT (mpvparse, "invalid start code");
goto retry;
}
next:
/* start is fine as of now */
*skipsize = 0;
/* terminating start code may have been found in prev scan already */
if (((gint) packet.size) >= 0) {
off = packet.offset + packet.size;
/* so now we have start code at start of data; locate next start code */
if (!gst_mpeg_video_parse (&packet, data, size, off)) {
off = -1;
} else {
g_assert (packet.offset >= 4);
off = packet.offset - 4;
}
} else {
off = -1;
}
GST_LOG_OBJECT (mpvparse, "next start code at %d", off);
if (off < 0) {
/* if draining, take all */
if (GST_BASE_PARSE_DRAINING (parse)) {
GST_LOG_OBJECT (mpvparse, "draining, accepting all data");
off = size;
ret = TRUE;
} else {
GST_LOG_OBJECT (mpvparse, "need more data");
/* resume scan where we left it */
mpvparse->last_sc = size - 3;
/* request best next available */
off = G_MAXUINT;
goto exit;
}
} else {
/* decide whether this startcode ends a frame */
ret = gst_mpegv_parse_process_sc (mpvparse, &map, off + 4, &packet);
}
if (!ret)
goto next;
exit:
gst_buffer_unmap (buf, &map);
if (ret) {
GstFlowReturn res;
*skipsize = 0;
g_assert (off <= map.size);
res = gst_mpegv_parse_parse_frame (parse, frame);
if (res == GST_BASE_PARSE_FLOW_DROPPED)
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_DROP;
flowret = gst_base_parse_finish_frame (parse, frame, off);
/* Reset local information */
mpvparse->seqhdr_updated = FALSE;
mpvparse->seqext_updated = FALSE;
mpvparse->seqdispext_updated = FALSE;
mpvparse->picext_updated = FALSE;
mpvparse->quantmatrext_updated = FALSE;
}
return flowret;
}
static void
gst_mpegv_parse_update_src_caps (GstMpegvParse * mpvparse)
{
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 (mpvparse)) &&
!mpvparse->update_caps))
return;
/* carry over input caps as much as possible; override with our own stuff */
caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (mpvparse));
if (caps) {
caps = gst_caps_make_writable (caps);
s = gst_caps_get_structure (caps, 0);
} else {
caps = gst_caps_new_empty_simple ("video/mpeg");
}
/* typically we don't output buffers until we have properly parsed some
* config data, so we should at least know about version.
* If not, it means it has been requested not to drop data, and
* upstream and/or app must know what they are doing ... */
gst_caps_set_simple (caps,
"mpegversion", G_TYPE_INT, (mpvparse->config_flags & FLAG_MPEG2) ? 2 : 1,
NULL);
gst_caps_set_simple (caps, "systemstream", G_TYPE_BOOLEAN, FALSE,
"parsed", G_TYPE_BOOLEAN, TRUE, NULL);
if (mpvparse->sequencehdr.width > 0 && mpvparse->sequencehdr.height > 0) {
GstMpegVideoSequenceDisplayExt *seqdispext;
gint width, height;
width = mpvparse->sequencehdr.width;
height = mpvparse->sequencehdr.height;
if (mpvparse->config_flags & FLAG_SEQUENCE_DISPLAY_EXT) {
seqdispext = &mpvparse->sequencedispext;
if (seqdispext->display_horizontal_size <= width
&& seqdispext->display_vertical_size <= height) {
width = seqdispext->display_horizontal_size;
height = seqdispext->display_vertical_size;
GST_INFO_OBJECT (mpvparse,
"stream has display extension: display_width=%d display_height=%d",
width, height);
}
}
gst_caps_set_simple (caps, "width", G_TYPE_INT, width,
"height", G_TYPE_INT, height, NULL);
}
/* perhaps we have a framerate */
{
gint fps_num = mpvparse->fps_num;
gint fps_den = mpvparse->fps_den;
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 (mpvparse),
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 (mpvparse), latency, latency);
}
}
/* or pixel-aspect-ratio */
if (mpvparse->sequencehdr.par_w && mpvparse->sequencehdr.par_h > 0 &&
(!s || !gst_structure_has_field (s, "pixel-aspect-ratio"))) {
gst_caps_set_simple (caps, "pixel-aspect-ratio", GST_TYPE_FRACTION,
mpvparse->sequencehdr.par_w, mpvparse->sequencehdr.par_h, NULL);
}
if (mpvparse->config != NULL) {
gst_caps_set_simple (caps, "codec_data",
GST_TYPE_BUFFER, mpvparse->config, NULL);
}
if (mpvparse->config_flags & FLAG_SEQUENCE_EXT) {
const guint profile_c = mpvparse->sequenceext.profile;
const guint level_c = mpvparse->sequenceext.level;
const gchar *profile = NULL, *level = NULL;
/*
* Profile indication - 1 => High, 2 => Spatially Scalable,
* 3 => SNR Scalable, 4 => Main, 5 => Simple
* 4:2:2 and Multi-view have profile = 0, with the escape bit set to 1
*/
const gchar *const profiles[] =
{ "high", "spatial", "snr", "main", "simple" };
/*
* Level indication - 4 => High, 6 => High-1440, 8 => Main, 10 => Low,
* except in the case of profile = 0
*/
const gchar *const levels[] = { "high", "high-1440", "main", "low" };
if (profile_c > 0 && profile_c < 6)
profile = profiles[profile_c - 1];
if ((level_c > 3) && (level_c < 11) && (level_c % 2 == 0))
level = levels[(level_c >> 1) - 2];
if (profile_c == 8) {
/* Non-hierarchical profile */
switch (level_c) {
case 2:
level = levels[0];
case 5:
level = levels[2];
profile = "4:2:2";
break;
case 10:
level = levels[0];
case 11:
level = levels[1];
case 13:
level = levels[2];
case 14:
level = levels[3];
profile = "multiview";
break;
default:
break;
}
}
/* FIXME does it make sense to expose profile/level in the caps ? */
GST_DEBUG_OBJECT (mpvparse, "profile:'%s' level:'%s'", profile, level);
if (profile)
gst_caps_set_simple (caps, "profile", G_TYPE_STRING, profile, NULL);
else
GST_DEBUG_OBJECT (mpvparse, "Invalid profile - %u", profile_c);
if (level)
gst_caps_set_simple (caps, "level", G_TYPE_STRING, level, NULL);
else
GST_DEBUG_OBJECT (mpvparse, "Invalid level - %u", level_c);
gst_caps_set_simple (caps, "interlace-mode",
G_TYPE_STRING,
(mpvparse->sequenceext.progressive ? "progressive" : "mixed"), NULL);
}
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (mpvparse), caps);
gst_caps_unref (caps);
mpvparse->update_caps = FALSE;
}
static GstFlowReturn
gst_mpegv_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstBuffer *buffer = frame->buffer;
if (G_UNLIKELY (mpvparse->pichdr.pic_type == GST_MPEG_VIDEO_PICTURE_TYPE_I))
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
/* maybe only sequence in this buffer, though not recommended,
* so mark it as such and force 0 duration */
if (G_UNLIKELY (mpvparse->pic_offset < 0)) {
GST_DEBUG_OBJECT (mpvparse, "frame holds no picture data");
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NO_FRAME;
GST_BUFFER_DURATION (buffer) = 0;
}
if (mpvparse->pic_offset > 4) {
gst_base_parse_set_ts_at_offset (parse, mpvparse->pic_offset - 4);
}
if (mpvparse->frame_repeat_count
&& GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer))) {
GST_BUFFER_DURATION (buffer) =
(1 + mpvparse->frame_repeat_count) * GST_BUFFER_DURATION (buffer) / 2;
}
if (G_UNLIKELY (mpvparse->drop && !mpvparse->config)) {
GST_DEBUG_OBJECT (mpvparse, "dropping frame as no config yet");
return GST_BASE_PARSE_FLOW_DROPPED;
}
gst_mpegv_parse_update_src_caps (mpvparse);
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mpegv_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstTagList *taglist;
GstMpegVideoMeta *meta;
GstMpegVideoSequenceHdr *seq_hdr = NULL;
GstMpegVideoSequenceExt *seq_ext = NULL;
GstMpegVideoSequenceDisplayExt *disp_ext = NULL;
GstMpegVideoPictureHdr *pic_hdr = NULL;
GstMpegVideoPictureExt *pic_ext = NULL;
GstMpegVideoQuantMatrixExt *quant_ext = NULL;
/* tag sending done late enough in hook to ensure pending events
* have already been sent */
if (G_UNLIKELY (mpvparse->send_codec_tag)) {
gchar *codec;
/* codec tag */
codec =
g_strdup_printf ("MPEG %d Video",
(mpvparse->config_flags & FLAG_MPEG2) ? 2 : 1);
taglist = gst_tag_list_new (GST_TAG_VIDEO_CODEC, codec, NULL);
g_free (codec);
gst_pad_push_event (GST_BASE_PARSE_SRC_PAD (mpvparse),
gst_event_new_tag (taglist));
mpvparse->send_codec_tag = FALSE;
}
/* usual clipping applies */
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
if (mpvparse->send_mpeg_meta) {
GstBuffer *buf;
if (mpvparse->seqhdr_updated)
seq_hdr = &mpvparse->sequencehdr;
if (mpvparse->seqext_updated)
seq_ext = &mpvparse->sequenceext;
if (mpvparse->seqdispext_updated)
disp_ext = &mpvparse->sequencedispext;
if (mpvparse->picext_updated)
pic_ext = &mpvparse->picext;
if (mpvparse->quantmatrext_updated)
quant_ext = &mpvparse->quantmatrext;
pic_hdr = &mpvparse->pichdr;
GST_DEBUG_OBJECT (mpvparse,
"Adding GstMpegVideoMeta (slice_count:%d, slice_offset:%d)",
mpvparse->slice_count, mpvparse->slice_offset);
if (frame->out_buffer) {
buf = frame->out_buffer = gst_buffer_make_writable (frame->out_buffer);
} else {
buf = frame->buffer = gst_buffer_make_writable (frame->buffer);
}
meta =
gst_buffer_add_mpeg_video_meta (buf, seq_hdr, seq_ext, disp_ext,
pic_hdr, pic_ext, quant_ext);
meta->num_slices = mpvparse->slice_count;
meta->slice_offset = mpvparse->slice_offset;
}
return GST_FLOW_OK;
}
static gboolean
gst_mpegv_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstStructure *s;
const GValue *value;
GstBuffer *buf;
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))) {
GstMapInfo map;
gst_buffer_map (buf, &map, GST_MAP_READ);
/* best possible parse attempt,
* src caps are based on sink caps so it will end up in there
* whether sucessful or not */
gst_mpegv_parse_process_config (mpvparse, &map, gst_buffer_get_size (buf));
gst_buffer_unmap (buf, &map);
gst_mpegv_parse_reset_frame (mpvparse);
}
/* let's not interfere and accept regardless of config parsing success */
return TRUE;
}
static GstCaps *
gst_mpegv_parse_get_caps (GstBaseParse * parse, GstCaps * filter)
{
GstCaps *peercaps, *templ;
GstCaps *res;
templ = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD (parse));
peercaps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), filter);
if (peercaps) {
guint i, n;
/* Remove the parsed field */
peercaps = gst_caps_make_writable (peercaps);
n = gst_caps_get_size (peercaps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (peercaps, i);
gst_structure_remove_field (s, "parsed");
}
res = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (peercaps);
res = gst_caps_make_writable (res);
/* Append the template caps because we still want to accept
* caps without any fields in the case upstream does not
* know anything.
*/
gst_caps_append (res, templ);
} else {
res = templ;
}
if (filter) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, res, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (res);
res = intersection;
}
return res;
}
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