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mpeg4videoparse: Port to the new mpeg4parser library

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This commit is contained in:
Thibault Saunier 2011-09-26 16:58:58 -03:00
parent db4d4979ab
commit 48ad76e538
5 changed files with 154 additions and 463 deletions
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4
gst/videoparsers/Makefile.am
View file

@ -4,7 +4,7 @@ libgstvideoparsersbad_la_SOURCES = plugin.c \
h263parse.c gsth263parse.c \
gstdiracparse.c dirac_parse.c \
gsth264parse.c gstmpegvideoparse.c \
gstmpeg4videoparse.c mpeg4parse.c
gstmpeg4videoparse.c
libgstvideoparsersbad_la_CFLAGS = \
$(GST_PLUGINS_BAD_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS) \
@ -19,7 +19,7 @@ libgstvideoparsersbad_la_LIBTOOLFLAGS = --tag=disable-static
noinst_HEADERS = gsth263parse.h h263parse.h \
gstdiracparse.h dirac_parse.h \
gsth264parse.h gstmpegvideoparse.h \
gstmpeg4videoparse.h mpeg4parse.h
gstmpeg4videoparse.h
Android.mk: Makefile.am $(BUILT_SOURCES)
androgenizer \

224
gst/videoparsers/gstmpeg4videoparse.c
View file

@ -3,8 +3,10 @@
* @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> Collabora Multimedia
* 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
@ -183,8 +185,8 @@ gst_mpeg4vparse_reset_frame (GstMpeg4VParse * mp4vparse)
/* done parsing; reset state */
mp4vparse->last_sc = -1;
mp4vparse->vop_offset = -1;
mp4vparse->vos_offset = -1;
mp4vparse->vo_offset = -1;
mp4vparse->vo_found = FALSE;
mp4vparse->vol_offset = -1;
}
static void
@ -195,7 +197,7 @@ gst_mpeg4vparse_reset (GstMpeg4VParse * mp4vparse)
mp4vparse->update_caps = TRUE;
gst_buffer_replace (&mp4vparse->config, NULL);
memset (&mp4vparse->params, 0, sizeof (mp4vparse->params));
memset (&mp4vparse->vol, 0, sizeof (mp4vparse->vol));
}
static gboolean
@ -225,30 +227,46 @@ gst_mpeg4vparse_stop (GstBaseParse * parse)
}
static gboolean
gst_mpeg4vparse_process_config (GstMpeg4VParse * mp4vparse, const guint8 * data,
gsize size)
gst_mpeg4vparse_process_config (GstMpeg4VParse * mp4vparse,
const guint8 * data, guint offset, gsize size)
{
/* 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;
if (!gst_mpeg4_params_parse_config (&mp4vparse->params, data, size)) {
GST_DEBUG_OBJECT (mp4vparse, "failed to parse config data (size %"
G_GSSIZE_FORMAT ")", size);
if (mp4vparse->vol_offset < 0) {
GST_WARNING ("No video object Layer parsed in this frame, cannot accept "
"config");
return FALSE;
}
/* If the parsing fail, we accept the config only if we don't have
* any config yet. */
if (gst_mpeg4_parse_video_object_layer (&mp4vparse->vol,
NULL, data + mp4vparse->vol_offset,
size - mp4vparse->vol_offset) != GST_MPEG4_PARSER_OK &&
mp4vparse->config)
return FALSE;
GST_LOG_OBJECT (mp4vparse, "Width/Height: %u/%u, "
"time increment resolution: %u fixed time increment: %u",
mp4vparse->vol.height, mp4vparse->vol.width,
mp4vparse->vol.vop_time_increment_resolution,
mp4vparse->vol.fixed_vop_time_increment);
GST_LOG_OBJECT (mp4vparse, "accepting parsed config size %" G_GSSIZE_FORMAT,
size);
/* parsing ok, so accept it as new config */
if (mp4vparse->config != NULL)
gst_buffer_unref (mp4vparse->config);
mp4vparse->config = gst_buffer_new_and_alloc (size);
memcpy (GST_BUFFER_DATA (mp4vparse->config), data, size);
/* trigger src caps update */
mp4vparse->update_caps = TRUE;
@ -257,68 +275,73 @@ gst_mpeg4vparse_process_config (GstMpeg4VParse * mp4vparse, const guint8 * data,
/* caller guarantees at least start code in @buf at @off */
static gboolean
gst_mpeg4vparse_process_sc (GstMpeg4VParse * mp4vparse, GstBuffer * buf,
gint off)
gst_mpeg4vparse_process_sc (GstMpeg4VParse * mp4vparse, GstMpeg4Packet * packet,
gsize size)
{
guint8 *data;
guint code;
g_return_val_if_fail (buf && GST_BUFFER_SIZE (buf) >= off + 4, FALSE);
data = GST_BUFFER_DATA (buf);
code = data[off + 3];
GST_LOG_OBJECT (mp4vparse, "process startcode %x", code);
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 && code != MPEG4_VOS_ENDCODE) {
if (G_LIKELY (GST_BUFFER_SIZE (buf) > mp4vparse->vop_offset + 4)) {
if (mp4vparse->vop_offset >= 0 &&
packet->type != GST_MPEG4_VISUAL_OBJ_SEQ_END) {
if (G_LIKELY (size > mp4vparse->vop_offset + 1)) {
mp4vparse->intra_frame =
((data[mp4vparse->vop_offset + 4] >> 6 & 0x3) == 0);
((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", off,
mp4vparse->intra_frame);
GST_LOG_OBJECT (mp4vparse, "ending frame of size %d, is intra %d",
packet->offset - 3, mp4vparse->intra_frame);
return TRUE;
}
switch (code) {
case MPEG4_VOP_STARTCODE:
case MPEG4_GOP_STARTCODE:
switch (packet->type) {
case GST_MPEG4_VIDEO_OBJ_PLANE:
case GST_MPEG4_GROUP_OF_VOP:
{
gint offset;
if (code == MPEG4_VOP_STARTCODE) {
if (packet->type == GST_MPEG4_VIDEO_OBJ_PLANE) {
GST_LOG_OBJECT (mp4vparse, "startcode is VOP");
mp4vparse->vop_offset = off;
mp4vparse->vop_offset = packet->offset;
} else {
GST_LOG_OBJECT (mp4vparse, "startcode is GOP");
}
/* 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);
if (mp4vparse->vo_found) {
/*Do not take care startcode into account */
gst_mpeg4vparse_process_config (mp4vparse,
packet->data, packet->offset, packet->offset - 3);
/* avoid accepting again for a VOP sc following a GOP sc */
mp4vparse->vos_offset = -1;
mp4vparse->vo_offset = -1;
mp4vparse->vo_found = FALSE;
}
break;
}
case MPEG4_VOS_STARTCODE:
GST_LOG_OBJECT (mp4vparse, "startcode is VOS");
mp4vparse->vos_offset = off;
case GST_MPEG4_VISUAL_OBJ_SEQ_START:
GST_LOG_OBJECT (mp4vparse, "Visual Sequence Start");
mp4vparse->vo_found = TRUE;
break;
case GST_MPEG4_VISUAL_OBJ:
GST_LOG_OBJECT (mp4vparse, "Visual Object");
default:
if (packet->type >= GST_MPEG4_VIDEO_LAYER_FIRST &&
packet->type <= GST_MPEG4_VIDEO_LAYER_LAST) {
GST_LOG_OBJECT (mp4vparse, "Video Object Layer");
/* wee keep track of the offset to parse later on */
if (mp4vparse->vol_offset < 0)
mp4vparse->vol_offset = packet->offset;
/* VO (video object) cases */
if (code <= 0x1f) {
GST_LOG_OBJECT (mp4vparse, "startcode is VO");
mp4vparse->vo_offset = off;
} else if (packet->type <= GST_MPEG4_VIDEO_OBJ_LAST) {
GST_LOG_OBJECT (mp4vparse, "Video object");
mp4vparse->vo_found = TRUE;
}
break;
}
@ -336,15 +359,15 @@ gst_mpeg4vparse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GstBuffer *buf = frame->buffer;
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
GstMpeg4Packet packet;
guint8 *data = GST_BUFFER_DATA (frame->buffer);
guint size = GST_BUFFER_SIZE (frame->buffer);
gint off = 0;
gboolean ret;
guint code;
retry:
/* at least start code and subsequent byte */
if (G_UNLIKELY (GST_BUFFER_SIZE (buf) - off < 5))
if (G_UNLIKELY (size - off < 5))
return FALSE;
/* avoid stale cached parsing state */
@ -362,36 +385,33 @@ retry:
goto next;
}
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffff00, 0x00000100,
off, GST_BUFFER_SIZE (buf) - off);
GST_LOG_OBJECT (mp4vparse, "possible sync at buffer offset %d", off);
/* didn't find anything that looks like a sync word, skip */
if (G_UNLIKELY (off < 0)) {
*skipsize = GST_BUFFER_SIZE (buf) - 3;
switch (gst_mpeg4_parse (&packet, TRUE, data, off, size)) {
case (GST_MPEG4_PARSER_NO_PACKET):
case (GST_MPEG4_PARSER_ERROR):
*skipsize = size - 3;
return FALSE;
default:
break;
}
off = packet.offset;
/* possible frame header, but not at offset 0? skip bytes before sync */
if (G_UNLIKELY (off > 0)) {
if (G_UNLIKELY (off > 4)) {
*skipsize = off;
return FALSE;
}
/* 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:
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 (code <= 0x1f)
if (packet.type <= GST_MPEG4_VIDEO_OBJ_LAST)
break;
/* undesirable sc */
GST_LOG_OBJECT (mp4vparse, "start code is no VOS, VO, VOP or GOP");
off++;
goto retry;
}
@ -399,37 +419,45 @@ retry:
mp4vparse->last_sc = 0;
/* examine start code, which should not end frame at present */
gst_mpeg4vparse_process_sc (mp4vparse, buf, 0);
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 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) {
/* so now we have start code at start of data; locate next packet */
switch (gst_mpeg4_parse (&packet, TRUE, 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)) {
off = GST_BUFFER_SIZE (buf);
ret = TRUE;
*framesize = size;
return TRUE;
} else {
/* resume scan where we left it */
mp4vparse->last_sc = GST_BUFFER_SIZE (buf) - 4;
mp4vparse->last_sc = size - 3;
/* request best next available */
*framesize = G_MAXUINT;
return FALSE;
}
} else {
default:
/* decide whether this startcode ends a frame */
ret = gst_mpeg4vparse_process_sc (mp4vparse, buf, off);
ret = gst_mpeg4vparse_process_sc (mp4vparse, &packet, size);
break;
}
off = packet.offset;
if (ret) {
*framesize = off;
*framesize = off - 3;
} else {
goto next;
}
@ -442,6 +470,8 @@ gst_mpeg4vparse_update_src_caps (GstMpeg4VParse * mp4vparse)
{
GstCaps *caps = NULL;
GST_LOG_OBJECT (mp4vparse, "Updating caps");
/* 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))
@ -474,15 +504,15 @@ gst_mpeg4vparse_update_src_caps (GstMpeg4VParse * mp4vparse)
GST_TYPE_BUFFER, mp4vparse->config, NULL);
}
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);
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 */
if (mp4vparse->params.fixed_time_increment != 0) {
gint fps_num = mp4vparse->params.time_increment_resolution;
gint fps_den = mp4vparse->params.fixed_time_increment;
if (mp4vparse->vol.fixed_vop_time_increment != 0) {
gint fps_num = mp4vparse->vol.vop_time_increment_resolution;
gint fps_den = mp4vparse->vol.fixed_vop_time_increment;
GstClockTime latency = gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
gst_caps_set_simple (caps, "framerate",
@ -493,11 +523,10 @@ gst_mpeg4vparse_update_src_caps (GstMpeg4VParse * mp4vparse)
}
/* or pixel-aspect-ratio */
if (mp4vparse->params.aspect_ratio_width > 0 &&
mp4vparse->params.aspect_ratio_height > 0) {
if (mp4vparse->vol.par_width > 0 && mp4vparse->vol.par_height > 0) {
gst_caps_set_simple (caps, "pixel-aspect-ratio",
GST_TYPE_FRACTION, mp4vparse->params.aspect_ratio_width,
mp4vparse->params.aspect_ratio_height, NULL);
GST_TYPE_FRACTION, mp4vparse->vol.par_width,
mp4vparse->vol.par_height, NULL);
}
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (mp4vparse), caps);
@ -518,7 +547,7 @@ gst_mpeg4vparse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
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");
GST_LOG_OBJECT (mp4vparse, "dropping frame as no config yet");
return GST_BASE_PARSE_FLOW_DROPPED;
} else
return GST_FLOW_OK;
@ -530,7 +559,7 @@ gst_mpeg4vparse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
GstMpeg4VParse *mp4vparse = GST_MPEG4VIDEO_PARSE (parse);
GstBuffer *buffer = frame->buffer;
/* periodic SPS/PPS sending */
/* periodic config sending */
if (mp4vparse->interval > 0) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
guint64 diff;
@ -590,6 +619,11 @@ gst_mpeg4vparse_set_caps (GstBaseParse * parse, GstCaps * caps)
GstStructure *s;
const GValue *value;
GstBuffer *buf;
guint8 *data;
gsize size;
GstMpeg4Packet packet;
GstMpeg4ParseResult res;
GST_DEBUG_OBJECT (parse, "setcaps called with %" GST_PTR_FORMAT, caps);
@ -600,8 +634,22 @@ gst_mpeg4vparse_set_caps (GstBaseParse * parse, GstCaps * caps)
/* best possible parse attempt,
* src caps are based on sink caps so it will end up in there
* whether sucessful or not */
data = GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
res = gst_mpeg4_parse (&packet, TRUE, 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;
res = gst_mpeg4_parse (&packet, TRUE, data, packet.offset, size);
}
/* And take it as config */
gst_mpeg4vparse_process_config (mp4vparse, GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
3, GST_BUFFER_SIZE (buf));
}
/* let's not interfere and accept regardless of config parsing success */

8
gst/videoparsers/gstmpeg4videoparse.h
View file

@ -23,7 +23,7 @@
#include <gst/gst.h>
#include <gst/base/gstbaseparse.h>
#include "mpeg4parse.h"
#include <gst/codecparsers/gstmpeg4parser.h>
G_BEGIN_DECLS
@ -50,14 +50,14 @@ struct _GstMpeg4VParse {
/* parse state */
gint last_sc;
gint vop_offset;
gint vos_offset;
gint vo_offset;
gboolean vo_found;
gboolean intra_frame;
gboolean update_caps;
GstBuffer *config;
guint8 profile;
MPEG4Params params;
GstMpeg4VideoObjectLayer vol;
gboolean vol_offset;
/* properties */
gboolean drop;

294
gst/videoparsers/mpeg4parse.c
View file

@ -1,294 +0,0 @@
/* GStreamer MPEG4-2 video Parser
* Copyright (C) <2008> Mindfruit B.V.
* @author Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) <2007> Julien Moutte <julien@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "mpeg4parse.h"
#include <gst/base/gstbitreader.h>
GST_DEBUG_CATEGORY_EXTERN (mpeg4v_parse_debug);
#define GST_CAT_DEFAULT mpeg4v_parse_debug
#define GET_BITS(b, num, bits) G_STMT_START { \
if (!gst_bit_reader_get_bits_uint32(b, bits, num)) \
goto failed; \
GST_TRACE ("parsed %d bits: %d", num, *(bits)); \
} G_STMT_END
#define MARKER_BIT(b) G_STMT_START { \
guint32 i; \
GET_BITS(b, 1, &i); \
if (i != 0x1) \
goto failed; \
} G_STMT_END
static inline gboolean
next_start_code (GstBitReader * b)
{
guint32 bits = 0;
GET_BITS (b, 1, &bits);
if (bits != 0)
goto failed;
while (b->bit != 0) {
GET_BITS (b, 1, &bits);
if (bits != 0x1)
goto failed;
}
return TRUE;
failed:
return FALSE;
}
static inline gboolean
skip_user_data (GstBitReader * bs, guint32 * bits)
{
while (*bits == MPEG4_USER_DATA_STARTCODE_MARKER) {
guint32 b = 0;
do {
GET_BITS (bs, 8, &b);
*bits = (*bits << 8) | b;
} while ((*bits >> 8) != MPEG4_START_MARKER);
}
return TRUE;
failed:
return FALSE;
}
static gint aspect_ratio_table[6][2] = {
{-1, -1}, {1, 1}, {12, 11}, {10, 11}, {16, 11}, {40, 33}
};
static gboolean
gst_mpeg4_params_parse_vo (MPEG4Params * params, GstBitReader * br)
{
guint32 bits;
guint16 time_increment_resolution = 0;
guint16 fixed_time_increment = 0;
gint aspect_ratio_width = -1, aspect_ratio_height = -1;
gint height = -1, width = -1;
/* expecting a video object startcode */
GET_BITS (br, 32, &bits);
if (bits > 0x11F)
goto failed;
/* expecting a video object layer startcode */
GET_BITS (br, 32, &bits);
if (bits < 0x120 || bits > 0x12F)
goto failed;
/* ignore random accessible vol and video object type indication */
GET_BITS (br, 9, &bits);
GET_BITS (br, 1, &bits);
if (bits) {
/* skip video object layer verid and priority */
GET_BITS (br, 7, &bits);
}
/* aspect ratio info */
GET_BITS (br, 4, &bits);
if (bits == 0)
goto failed;
/* check if aspect ratio info is extended par */
if (bits == 0xf) {
GET_BITS (br, 8, &bits);
aspect_ratio_width = bits;
GET_BITS (br, 8, &bits);
aspect_ratio_height = bits;
} else if (bits < 0x6) {
aspect_ratio_width = aspect_ratio_table[bits][0];
aspect_ratio_height = aspect_ratio_table[bits][1];
}
GST_DEBUG ("aspect ratio %d/%d", aspect_ratio_width, aspect_ratio_height);
GET_BITS (br, 1, &bits);
if (bits) {
/* vol control parameters, skip chroma and low delay */
GET_BITS (br, 3, &bits);
GET_BITS (br, 1, &bits);
if (bits) {
/* skip vbv_parameters */
if (!gst_bit_reader_skip (br, 79))
goto failed;
}
}
/* layer shape */
GET_BITS (br, 2, &bits);
/* only support rectangular */
if (bits != 0)
goto failed;
MARKER_BIT (br);
GET_BITS (br, 16, &bits);
time_increment_resolution = bits;
MARKER_BIT (br);
GST_DEBUG ("time increment resolution %d", time_increment_resolution);
GET_BITS (br, 1, &bits);
if (bits) {
/* fixed time increment */
int n;
/* Length of the time increment is the minimal number of bits needed to
* represent time_increment_resolution-1 */
for (n = 0; ((time_increment_resolution - 1) >> n) != 0; n++);
GET_BITS (br, n, &bits);
fixed_time_increment = bits;
} else {
/* When fixed_vop_rate is not set we can't guess any framerate */
fixed_time_increment = 0;
}
GST_DEBUG ("fixed time increment %d", fixed_time_increment);
/* assuming rectangular shape */
MARKER_BIT (br);
GET_BITS (br, 13, &bits);
width = bits;
MARKER_BIT (br);
GET_BITS (br, 13, &bits);
height = bits;
MARKER_BIT (br);
GST_DEBUG ("width x height: %d x %d", width, height);
/* so we got it all, report back */
params->width = width;
params->height = height;
params->time_increment_resolution = time_increment_resolution;
params->fixed_time_increment = fixed_time_increment;
params->aspect_ratio_width = aspect_ratio_width;
params->aspect_ratio_height = aspect_ratio_height;
return TRUE;
/* ERRORS */
failed:
{
GST_WARNING ("Failed to parse config data");
return FALSE;
}
}
static gboolean
gst_mpeg4_params_parse_vos (MPEG4Params * params, GstBitReader * br)
{
guint32 bits = 0;
GET_BITS (br, 32, &bits);
if (bits != MPEG4_VOS_STARTCODE_MARKER)
goto failed;
GET_BITS (br, 8, &bits);
params->profile = bits;
/* invalid profile, warn but carry on */
if (params->profile == 0) {
GST_WARNING ("Invalid profile in VOS");
}
/* Expect Visual Object startcode */
GET_BITS (br, 32, &bits);
/* but skip optional user data */
if (!skip_user_data (br, &bits))
goto failed;
if (bits != MPEG4_VISUAL_OBJECT_STARTCODE_MARKER)
goto failed;
GET_BITS (br, 1, &bits);
if (bits == 0x1) {
/* Skip visual_object_verid and priority */
GET_BITS (br, 7, &bits);
}
GET_BITS (br, 4, &bits);
/* Only support video ID */
if (bits != 0x1)
goto failed;
/* video signal type */
GET_BITS (br, 1, &bits);
if (bits == 0x1) {
/* video signal type, ignore format and range */
GET_BITS (br, 4, &bits);
GET_BITS (br, 1, &bits);
if (bits == 0x1) {
/* ignore color description */
GET_BITS (br, 24, &bits);
}
}
if (!next_start_code (br))
goto failed;
/* skip optional user data */
GET_BITS (br, 32, &bits);
if (!skip_user_data (br, &bits))
goto failed;
/* rewind to start code */
gst_bit_reader_set_pos (br, gst_bit_reader_get_pos (br) - 32);
return gst_mpeg4_params_parse_vo (params, br);
/* ERRORS */
failed:
{
GST_WARNING ("Failed to parse config data");
return FALSE;
}
}
gboolean
gst_mpeg4_params_parse_config (MPEG4Params * params, const guint8 * data,
guint size)
{
GstBitReader br;
if (size < 4)
return FALSE;
gst_bit_reader_init (&br, data, size);
if (data[3] == MPEG4_VOS_STARTCODE)
return gst_mpeg4_params_parse_vos (params, &br);
else
return gst_mpeg4_params_parse_vo (params, &br);
}

63
gst/videoparsers/mpeg4parse.h
View file

@ -1,63 +0,0 @@
/* GStreamer MPEG4-2 video Parser
* Copyright (C) <2008> Mindfruit B.V.
* @author Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) <2007> Julien Moutte <julien@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_MPEG4_PARAMS_H__
#define __GST_MPEG4_PARAMS_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define MPEG4_VIDEO_OBJECT_STARTCODE_MIN 0x00
#define MPEG4_VIDEO_OBJECT_STARTCODE_MAX 0x1F
#define MPEG4_VOS_STARTCODE 0xB0
#define MPEG4_VOS_ENDCODE 0xB1
#define MPEG4_USER_DATA_STARTCODE 0xB2
#define MPEG4_GOP_STARTCODE 0xB3
#define MPEG4_VISUAL_OBJECT_STARTCODE 0xB5
#define MPEG4_VOP_STARTCODE 0xB6
#define MPEG4_START_MARKER 0x000001
#define MPEG4_VISUAL_OBJECT_STARTCODE_MARKER \
((MPEG4_START_MARKER << 8) + MPEG4_VISUAL_OBJECT_STARTCODE)
#define MPEG4_VOS_STARTCODE_MARKER \
((MPEG4_START_MARKER << 8) + MPEG4_VOS_STARTCODE)
#define MPEG4_USER_DATA_STARTCODE_MARKER \
((MPEG4_START_MARKER << 8) + MPEG4_USER_DATA_STARTCODE)
typedef struct _MPEG4Params MPEG4Params;
struct _MPEG4Params
{
gint profile;
gint width, height;
gint aspect_ratio_width, aspect_ratio_height;
gint time_increment_resolution;
gint fixed_time_increment;
};
GstFlowReturn gst_mpeg4_params_parse_config (MPEG4Params * params,
const guint8 * data, guint size);
G_END_DECLS
#endif