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gstreamer/gst/vmnc/vmncdec.c
Tim-Philipp Müller 9e1b75fda3 Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-04 00:09:59 +00:00

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/* GStreamer
* Copyright (C) 2007 Michael Smith <msmith@xiph.org>
*
* 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.
*/
/*
* This is a decoder for the VMWare VMnc video codec, which VMWare uses for
* recording * of virtual machine instances.
* It's essentially a serialisation of RFB (the VNC protocol)
* 'FramebufferUpdate' messages, with some special encoding-types for VMnc
* extensions. There's some documentation (with fixes from VMWare employees) at:
* http://wiki.multimedia.cx/index.php?title=VMware_Video
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstadapter.h>
#include <gst/video/video.h>
#include <string.h>
#define GST_CAT_DEFAULT vmnc_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define GST_TYPE_VMNC_DEC \
(gst_vmnc_dec_get_type())
#define GST_VMNC_DEC(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VMNC_DEC,GstVMncDec))
#define RFB_GET_UINT32(ptr) GST_READ_UINT32_BE(ptr)
#define RFB_GET_UINT16(ptr) GST_READ_UINT16_BE(ptr)
#define RFB_GET_UINT8(ptr) GST_READ_UINT8(ptr)
enum
{
ARG_0,
};
enum
{
ERROR_INVALID = -1, /* Invalid data in bitstream */
ERROR_INSUFFICIENT_DATA = -2 /* Haven't received enough data yet */
};
#define MAKE_TYPE(a,b,c,d) ((a<<24)|(b<<16)|(c<<8)|d)
enum
{
TYPE_RAW = 0,
TYPE_COPY = 1,
TYPE_RRE = 2,
TYPE_CoRRE = 4,
TYPE_HEXTILE = 5,
TYPE_WMVd = MAKE_TYPE ('W', 'M', 'V', 'd'),
TYPE_WMVe = MAKE_TYPE ('W', 'M', 'V', 'e'),
TYPE_WMVf = MAKE_TYPE ('W', 'M', 'V', 'f'),
TYPE_WMVg = MAKE_TYPE ('W', 'M', 'V', 'g'),
TYPE_WMVh = MAKE_TYPE ('W', 'M', 'V', 'h'),
TYPE_WMVi = MAKE_TYPE ('W', 'M', 'V', 'i'),
TYPE_WMVj = MAKE_TYPE ('W', 'M', 'V', 'j')
};
struct RFBFormat
{
int width;
int height;
int stride;
int bytes_per_pixel;
int depth;
int big_endian;
guint8 descriptor[16]; /* The raw format descriptor block */
};
enum CursorType
{
CURSOR_COLOUR = 0,
CURSOR_ALPHA = 1
};
struct Cursor
{
enum CursorType type;
int visible;
int x;
int y;
int width;
int height;
int hot_x;
int hot_y;
guint8 *cursordata;
guint8 *cursormask;
};
typedef struct
{
GstElement element;
GstPad *sinkpad;
GstPad *srcpad;
GstCaps *caps;
gboolean have_format;
int parsed;
GstAdapter *adapter;
int framerate_num;
int framerate_denom;
struct Cursor cursor;
struct RFBFormat format;
guint8 *imagedata;
} GstVMncDec;
typedef struct
{
GstElementClass parent_class;
} GstVMncDecClass;
static GstStaticPadTemplate vmnc_dec_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-rgb"));
static GstStaticPadTemplate vmnc_dec_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vmnc, version=(int)1, "
"framerate=(fraction)[0, max], "
"width=(int)[0, max], " "height=(int)[0, max]")
);
GType gst_vmnc_dec_get_type (void);
GST_BOILERPLATE (GstVMncDec, gst_vmnc_dec, GstElement, GST_TYPE_ELEMENT);
static void vmnc_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void vmnc_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static GstFlowReturn vmnc_dec_chain (GstPad * pad, GstBuffer * buffer);
static gboolean vmnc_dec_setcaps (GstPad * pad, GstCaps * caps);
static GstStateChangeReturn vmnc_dec_change_state (GstElement * element,
GstStateChange transition);
static void vmnc_dec_finalize (GObject * object);
static void
gst_vmnc_dec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&vmnc_dec_src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&vmnc_dec_sink_factory));
gst_element_class_set_static_metadata (element_class, "VMnc video decoder",
"Codec/Decoder/Video",
"Decode VmWare video to raw (RGB) video",
"Michael Smith <msmith@xiph.org>");
}
static void
gst_vmnc_dec_class_init (GstVMncDecClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = vmnc_dec_set_property;
gobject_class->get_property = vmnc_dec_get_property;
gobject_class->finalize = vmnc_dec_finalize;
gstelement_class->change_state = vmnc_dec_change_state;
GST_DEBUG_CATEGORY_INIT (vmnc_debug, "vmncdec", 0, "VMnc decoder");
}
static void
gst_vmnc_dec_init (GstVMncDec * dec, GstVMncDecClass * g_class)
{
dec->sinkpad =
gst_pad_new_from_static_template (&vmnc_dec_sink_factory, "sink");
gst_pad_set_chain_function (dec->sinkpad, vmnc_dec_chain);
gst_pad_set_setcaps_function (dec->sinkpad, vmnc_dec_setcaps);
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
dec->srcpad = gst_pad_new_from_static_template (&vmnc_dec_src_factory, "src");
gst_pad_use_fixed_caps (dec->srcpad);
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
dec->adapter = gst_adapter_new ();
}
static void
vmnc_dec_finalize (GObject * object)
{
GstVMncDec *dec = GST_VMNC_DEC (object);
g_object_unref (dec->adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_vmnc_dec_reset (GstVMncDec * dec)
{
if (dec->caps) {
gst_caps_unref (dec->caps);
dec->caps = NULL;
}
if (dec->imagedata) {
g_free (dec->imagedata);
dec->imagedata = NULL;
}
if (dec->cursor.cursordata) {
g_free (dec->cursor.cursordata);
dec->cursor.cursordata = NULL;
}
if (dec->cursor.cursormask) {
g_free (dec->cursor.cursormask);
dec->cursor.cursormask = NULL;
}
dec->cursor.visible = 0;
/* Use these as defaults if the container doesn't provide anything */
dec->framerate_num = 5;
dec->framerate_denom = 1;
dec->have_format = FALSE;
gst_adapter_clear (dec->adapter);
}
struct RfbRectangle
{
guint16 x;
guint16 y;
guint16 width;
guint16 height;
gint32 type;
};
/* Rectangle handling functions.
* Return number of bytes consumed, or < 0 on error
*/
typedef int (*rectangle_handler) (GstVMncDec * dec, struct RfbRectangle * rect,
const guint8 * data, int len, gboolean decode);
static int
vmnc_handle_wmvi_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
GstCaps *caps;
gint bpp, tc;
guint32 redmask, greenmask, bluemask;
guint32 endianness, dataendianness;
/* A WMVi rectangle has a 16byte payload */
if (len < 16) {
GST_DEBUG_OBJECT (dec, "Bad WMVi rect: too short");
return ERROR_INSUFFICIENT_DATA;
}
/* We only compare 13 bytes; ignoring the 3 padding bytes at the end */
if (dec->caps && memcmp (data, dec->format.descriptor, 13) == 0) {
/* Nothing changed, so just exit */
return 16;
}
/* Store the whole block for simple comparison later */
memcpy (dec->format.descriptor, data, 16);
if (rect->x != 0 || rect->y != 0) {
GST_WARNING_OBJECT (dec, "Bad WMVi rect: wrong coordinates");
return ERROR_INVALID;
}
bpp = data[0];
dec->format.depth = data[1];
dec->format.big_endian = data[2];
dataendianness = data[2] ? G_BIG_ENDIAN : G_LITTLE_ENDIAN;
tc = data[3];
if (bpp != 8 && bpp != 16 && bpp != 32) {
GST_WARNING_OBJECT (dec, "Bad bpp value: %d", bpp);
return ERROR_INVALID;
}
if (!tc) {
GST_WARNING_OBJECT (dec, "Paletted video not supported");
return ERROR_INVALID;
}
dec->format.bytes_per_pixel = bpp / 8;
dec->format.width = rect->width;
dec->format.height = rect->height;
redmask = (guint32) (RFB_GET_UINT16 (data + 4)) << data[10];
greenmask = (guint32) (RFB_GET_UINT16 (data + 6)) << data[11];
bluemask = (guint32) (RFB_GET_UINT16 (data + 8)) << data[12];
GST_DEBUG_OBJECT (dec, "Red: mask %d, shift %d",
RFB_GET_UINT16 (data + 4), data[10]);
GST_DEBUG_OBJECT (dec, "Green: mask %d, shift %d",
RFB_GET_UINT16 (data + 6), data[11]);
GST_DEBUG_OBJECT (dec, "Blue: mask %d, shift %d",
RFB_GET_UINT16 (data + 8), data[12]);
GST_DEBUG_OBJECT (dec, "BPP: %d. endianness: %s", bpp,
data[2] ? "big" : "little");
/* GStreamer's RGB caps are a bit weird. */
if (bpp == 8) {
endianness = G_BYTE_ORDER; /* Doesn't matter */
} else if (bpp == 16) {
/* We require host-endian. */
endianness = G_BYTE_ORDER;
} else { /* bpp == 32 */
/* We require big endian */
endianness = G_BIG_ENDIAN;
if (endianness != dataendianness) {
redmask = GUINT32_SWAP_LE_BE (redmask);
greenmask = GUINT32_SWAP_LE_BE (greenmask);
bluemask = GUINT32_SWAP_LE_BE (bluemask);
}
}
dec->have_format = TRUE;
if (!decode) {
GST_DEBUG_OBJECT (dec, "Parsing, not setting caps");
return 16;
}
caps = gst_caps_new_simple ("video/x-raw-rgb",
"framerate", GST_TYPE_FRACTION, dec->framerate_num, dec->framerate_denom,
"pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
"width", G_TYPE_INT, rect->width, "height", G_TYPE_INT, rect->height,
"bpp", G_TYPE_INT, bpp,
"depth", G_TYPE_INT, dec->format.depth,
"endianness", G_TYPE_INT, endianness,
"red_mask", G_TYPE_INT, redmask,
"green_mask", G_TYPE_INT, greenmask,
"blue_mask", G_TYPE_INT, bluemask, NULL);
gst_pad_set_caps (dec->srcpad, caps);
if (dec->caps)
gst_caps_unref (dec->caps);
dec->caps = caps;
if (dec->imagedata)
g_free (dec->imagedata);
dec->imagedata = g_malloc (dec->format.width * dec->format.height *
dec->format.bytes_per_pixel);
GST_DEBUG_OBJECT (dec, "Allocated image data at %p", dec->imagedata);
dec->format.stride = dec->format.width * dec->format.bytes_per_pixel;
return 16;
}
static void
render_colour_cursor (GstVMncDec * dec, guint8 * data, int x, int y,
int off_x, int off_y, int width, int height)
{
int i, j;
guint8 *dstraw = data + dec->format.stride * y +
dec->format.bytes_per_pixel * x;
guint8 *srcraw = dec->cursor.cursordata +
dec->cursor.width * dec->format.bytes_per_pixel * off_y;
guint8 *maskraw = dec->cursor.cursormask +
dec->cursor.width * dec->format.bytes_per_pixel * off_y;
/* Boundchecking done by caller; this is just the renderer inner loop */
if (dec->format.bytes_per_pixel == 1) {
guint8 *dst = dstraw;
guint8 *src = srcraw;
guint8 *mask = maskraw;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
dst[j] = (dst[j] & src[j]) ^ mask[j];
}
dst += dec->format.width;
src += dec->cursor.width;
mask += dec->cursor.width;
}
} else if (dec->format.bytes_per_pixel == 2) {
guint16 *dst = (guint16 *) dstraw;
guint16 *src = (guint16 *) srcraw;
guint16 *mask = (guint16 *) maskraw;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
dst[j] = (dst[j] & src[j]) ^ mask[j];
}
dst += dec->format.width;
src += dec->cursor.width;
mask += dec->cursor.width;
}
} else {
guint32 *dst = (guint32 *) dstraw;
guint32 *src = (guint32 *) srcraw;
guint32 *mask = (guint32 *) maskraw;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
dst[j] = (dst[j] & src[j]) ^ mask[j];
}
dst += dec->format.width;
src += dec->cursor.width;
mask += dec->cursor.width;
}
}
}
static void
render_cursor (GstVMncDec * dec, guint8 * data)
{
/* First, figure out the portion of the cursor that's on-screen */
/* X,Y of top-left of cursor */
int x = dec->cursor.x - dec->cursor.hot_x;
int y = dec->cursor.y - dec->cursor.hot_y;
/* Width, height of rendered portion of cursor */
int width = dec->cursor.width;
int height = dec->cursor.height;
/* X,Y offset of rendered portion of cursor */
int off_x = 0;
int off_y = 0;
if (x < 0) {
off_x = -x;
width += x;
x = 0;
}
if (x + width > dec->format.width)
width = dec->format.width - x;
if (y < 0) {
off_y = -y;
height += y;
y = 0;
}
if (y + height > dec->format.height)
height = dec->format.height - y;
if (dec->cursor.type == CURSOR_COLOUR) {
render_colour_cursor (dec, data, x, y, off_x, off_y, width, height);
} else {
/* Alpha cursor. */
/* TODO: Implement me! */
GST_WARNING_OBJECT (dec, "Alpha composited cursors not yet implemented");
}
}
static GstBuffer *
vmnc_make_buffer (GstVMncDec * dec, GstBuffer * inbuf)
{
int size = dec->format.stride * dec->format.height;
GstBuffer *buf = gst_buffer_new_and_alloc (size);
guint8 *data = GST_BUFFER_DATA (buf);
memcpy (data, dec->imagedata, size);
if (dec->cursor.visible) {
render_cursor (dec, data);
}
if (inbuf) {
gst_buffer_copy_metadata (buf, inbuf, GST_BUFFER_COPY_TIMESTAMPS);
}
gst_buffer_set_caps (buf, dec->caps);
return buf;
}
static int
vmnc_handle_wmvd_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
/* Cursor data. */
int datalen = 2;
int type, size;
if (len < datalen) {
GST_DEBUG_OBJECT (dec, "Cursor data too short");
return ERROR_INSUFFICIENT_DATA;
}
type = RFB_GET_UINT8 (data);
if (type == CURSOR_COLOUR) {
datalen += rect->width * rect->height * dec->format.bytes_per_pixel * 2;
} else if (type == CURSOR_ALPHA) {
datalen += rect->width * rect->height * 4;
} else {
GST_WARNING_OBJECT (dec, "Unknown cursor type: %d", type);
return ERROR_INVALID;
}
if (len < datalen) {
GST_DEBUG_OBJECT (dec, "Cursor data too short");
return ERROR_INSUFFICIENT_DATA;
} else if (!decode)
return datalen;
dec->cursor.type = type;
dec->cursor.width = rect->width;
dec->cursor.height = rect->height;
dec->cursor.type = type;
dec->cursor.hot_x = rect->x;
dec->cursor.hot_y = rect->y;
if (dec->cursor.cursordata)
g_free (dec->cursor.cursordata);
if (dec->cursor.cursormask)
g_free (dec->cursor.cursormask);
if (type == 0) {
size = rect->width * rect->height * dec->format.bytes_per_pixel;
dec->cursor.cursordata = g_malloc (size);
dec->cursor.cursormask = g_malloc (size);
memcpy (dec->cursor.cursordata, data + 2, size);
memcpy (dec->cursor.cursormask, data + 2 + size, size);
} else {
dec->cursor.cursordata = g_malloc (rect->width * rect->height * 4);
memcpy (dec->cursor.cursordata, data + 2, rect->width * rect->height * 4);
}
return datalen;
}
static int
vmnc_handle_wmve_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
guint16 flags;
/* Cursor state. */
if (len < 2) {
GST_DEBUG_OBJECT (dec, "Cursor data too short");
return ERROR_INSUFFICIENT_DATA;
} else if (!decode)
return 2;
flags = RFB_GET_UINT16 (data);
dec->cursor.visible = flags & 0x01;
return 2;
}
static int
vmnc_handle_wmvf_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
/* Cursor position. */
dec->cursor.x = rect->x;
dec->cursor.y = rect->y;
return 0;
}
static int
vmnc_handle_wmvg_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
/* Keyboard stuff; not interesting for playback */
if (len < 10) {
GST_DEBUG_OBJECT (dec, "Keyboard data too short");
return ERROR_INSUFFICIENT_DATA;
}
return 10;
}
static int
vmnc_handle_wmvh_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
/* More keyboard stuff; not interesting for playback */
if (len < 4) {
GST_DEBUG_OBJECT (dec, "Keyboard data too short");
return ERROR_INSUFFICIENT_DATA;
}
return 4;
}
static int
vmnc_handle_wmvj_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
/* VM state info, not interesting for playback */
if (len < 2) {
GST_DEBUG_OBJECT (dec, "VM state data too short");
return ERROR_INSUFFICIENT_DATA;
}
return 2;
}
static void
render_raw_tile (GstVMncDec * dec, const guint8 * data, int x, int y,
int width, int height)
{
int i;
guint8 *dst;
const guint8 *src;
int line;
src = data;
dst = dec->imagedata + dec->format.stride * y +
dec->format.bytes_per_pixel * x;
line = width * dec->format.bytes_per_pixel;
for (i = 0; i < height; i++) {
/* This is wrong-endian currently */
memcpy (dst, src, line);
dst += dec->format.stride;
src += line;
}
}
static void
render_subrect (GstVMncDec * dec, int x, int y, int width,
int height, guint32 colour)
{
/* Crazy inefficient! */
int i, j;
guint8 *dst;
for (i = 0; i < height; i++) {
dst = dec->imagedata + dec->format.stride * (y + i) +
dec->format.bytes_per_pixel * x;
for (j = 0; j < width; j++) {
memcpy (dst, &colour, dec->format.bytes_per_pixel);
dst += dec->format.bytes_per_pixel;
}
}
}
static int
vmnc_handle_raw_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
int datalen = rect->width * rect->height * dec->format.bytes_per_pixel;
if (len < datalen) {
GST_DEBUG_OBJECT (dec, "Raw data too short");
return ERROR_INSUFFICIENT_DATA;
}
if (decode)
render_raw_tile (dec, data, rect->x, rect->y, rect->width, rect->height);
return datalen;
}
static int
vmnc_handle_copy_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
int src_x, src_y;
guint8 *src, *dst;
int i;
if (len < 4) {
GST_DEBUG_OBJECT (dec, "Copy data too short");
return ERROR_INSUFFICIENT_DATA;
} else if (!decode)
return 4;
src_x = RFB_GET_UINT16 (data);
src_y = RFB_GET_UINT16 (data + 2);
/* Our destination rectangle is guaranteed in-frame; check this for the source
* rectangle. */
if (src_x + rect->width > dec->format.width ||
src_y + rect->height > dec->format.height) {
GST_WARNING_OBJECT (dec, "Source rectangle out of range");
return ERROR_INVALID;
}
if (src_y > rect->y || src_x > rect->x) {
/* Moving forward */
src = dec->imagedata + dec->format.stride * src_y +
dec->format.bytes_per_pixel * src_x;
dst = dec->imagedata + dec->format.stride * rect->y +
dec->format.bytes_per_pixel * rect->x;
for (i = 0; i < rect->height; i++) {
memmove (dst, src, rect->width * dec->format.bytes_per_pixel);
dst += dec->format.stride;
src += dec->format.stride;
}
} else {
/* Backwards */
src = dec->imagedata + dec->format.stride * (src_y + rect->height - 1) +
dec->format.bytes_per_pixel * src_x;
dst = dec->imagedata + dec->format.stride * (rect->y + rect->height - 1) +
dec->format.bytes_per_pixel * rect->x;
for (i = rect->height; i > 0; i--) {
memmove (dst, src, rect->width * dec->format.bytes_per_pixel);
dst -= dec->format.stride;
src -= dec->format.stride;
}
}
return 4;
}
/* FIXME: data+off might not be properly aligned */
#define READ_PIXEL(pixel, data, off, len) \
if (dec->format.bytes_per_pixel == 1) { \
if (off >= len) \
return ERROR_INSUFFICIENT_DATA; \
pixel = data[off++]; \
} else if (dec->format.bytes_per_pixel == 2) { \
if (off+2 > len) \
return ERROR_INSUFFICIENT_DATA; \
pixel = (*(guint16 *)(data + off)); \
off += 2; \
} else { \
if (off+4 > len) \
return ERROR_INSUFFICIENT_DATA; \
pixel = (*(guint32 *)(data + off)); \
off += 4; \
}
static int
vmnc_handle_hextile_rectangle (GstVMncDec * dec, struct RfbRectangle *rect,
const guint8 * data, int len, gboolean decode)
{
int tilesx = GST_ROUND_UP_16 (rect->width) / 16;
int tilesy = GST_ROUND_UP_16 (rect->height) / 16;
int x, y, z;
int off = 0;
int subrects;
int coloured;
int width, height;
guint32 fg = 0, bg = 0, colour;
guint8 flags;
for (y = 0; y < tilesy; y++) {
if (y == tilesy - 1)
height = rect->height - (tilesy - 1) * 16;
else
height = 16;
for (x = 0; x < tilesx; x++) {
if (x == tilesx - 1)
width = rect->width - (tilesx - 1) * 16;
else
width = 16;
if (off >= len) {
return ERROR_INSUFFICIENT_DATA;
}
flags = data[off++];
if (flags & 0x1) {
if (off + width * height * dec->format.bytes_per_pixel > len) {
return ERROR_INSUFFICIENT_DATA;
}
if (decode)
render_raw_tile (dec, data + off, rect->x + x * 16, rect->y + y * 16,
width, height);
off += width * height * dec->format.bytes_per_pixel;
} else {
if (flags & 0x2) {
READ_PIXEL (bg, data, off, len)
}
if (flags & 0x4) {
READ_PIXEL (fg, data, off, len)
}
subrects = 0;
if (flags & 0x8) {
if (off >= len) {
return ERROR_INSUFFICIENT_DATA;
}
subrects = data[off++];
}
/* Paint background colour on entire tile */
if (decode)
render_subrect (dec, rect->x + x * 16, rect->y + y * 16,
width, height, bg);
coloured = flags & 0x10;
for (z = 0; z < subrects; z++) {
if (coloured) {
READ_PIXEL (colour, data, off, len);
} else
colour = fg;
if (off + 2 > len)
return ERROR_INSUFFICIENT_DATA;
{
int off_x = (data[off] & 0xf0) >> 4;
int off_y = (data[off] & 0x0f);
int w = ((data[off + 1] & 0xf0) >> 4) + 1;
int h = (data[off + 1] & 0x0f) + 1;
off += 2;
/* Ensure we don't have out of bounds coordinates */
if (off_x + w > width || off_y + h > height) {
GST_WARNING_OBJECT (dec, "Subrect out of bounds: %d-%d x %d-%d "
"extends outside %dx%d", off_x, w, off_y, h, width, height);
return ERROR_INVALID;
}
if (decode)
render_subrect (dec, rect->x + x * 16 + off_x,
rect->y + y * 16 + off_y, w, h, colour);
}
}
}
}
}
return off;
}
/* Handle a packet in one of two modes: decode or parse.
* In parse mode, we don't execute any of the decoding, we just do enough to
* figure out how many bytes it contains
*
* Returns: >= 0, the number of bytes consumed
* < 0, packet too short to decode, or error
*/
static int
vmnc_handle_packet (GstVMncDec * dec, const guint8 * data, int len,
gboolean decode)
{
int type;
int offset = 0;
if (len < 4) {
GST_DEBUG_OBJECT (dec, "Packet too short");
return ERROR_INSUFFICIENT_DATA;
}
type = data[0];
switch (type) {
case 0:
{
int numrect = RFB_GET_UINT16 (data + 2);
int i;
int read;
offset = 4;
for (i = 0; i < numrect; i++) {
struct RfbRectangle r;
rectangle_handler handler;
if (len < offset + 12) {
GST_DEBUG_OBJECT (dec,
"Packet too short for rectangle header: %d < %d",
len, offset + 12);
return ERROR_INSUFFICIENT_DATA;
}
GST_DEBUG_OBJECT (dec, "Reading rectangle %d", i);
r.x = RFB_GET_UINT16 (data + offset);
r.y = RFB_GET_UINT16 (data + offset + 2);
r.width = RFB_GET_UINT16 (data + offset + 4);
r.height = RFB_GET_UINT16 (data + offset + 6);
r.type = RFB_GET_UINT32 (data + offset + 8);
if (r.type != TYPE_WMVi) {
/* We must have a WMVi packet to initialise things before we can
* continue */
if (!dec->have_format) {
GST_WARNING_OBJECT (dec, "Received packet without WMVi: %d",
r.type);
return ERROR_INVALID;
}
if (r.x + r.width > dec->format.width ||
r.y + r.height > dec->format.height) {
GST_WARNING_OBJECT (dec, "Rectangle out of range, type %d", r.type);
return ERROR_INVALID;
}
}
switch (r.type) {
case TYPE_WMVd:
handler = vmnc_handle_wmvd_rectangle;
break;
case TYPE_WMVe:
handler = vmnc_handle_wmve_rectangle;
break;
case TYPE_WMVf:
handler = vmnc_handle_wmvf_rectangle;
break;
case TYPE_WMVg:
handler = vmnc_handle_wmvg_rectangle;
break;
case TYPE_WMVh:
handler = vmnc_handle_wmvh_rectangle;
break;
case TYPE_WMVi:
handler = vmnc_handle_wmvi_rectangle;
break;
case TYPE_WMVj:
handler = vmnc_handle_wmvj_rectangle;
break;
case TYPE_RAW:
handler = vmnc_handle_raw_rectangle;
break;
case TYPE_COPY:
handler = vmnc_handle_copy_rectangle;
break;
case TYPE_HEXTILE:
handler = vmnc_handle_hextile_rectangle;
break;
default:
GST_WARNING_OBJECT (dec, "Unknown rectangle type");
return ERROR_INVALID;
}
read = handler (dec, &r, data + offset + 12, len - offset - 12, decode);
if (read < 0) {
GST_DEBUG_OBJECT (dec, "Error calling rectangle handler\n");
return read;
}
offset += 12 + read;
}
break;
}
default:
GST_WARNING_OBJECT (dec, "Packet type unknown: %d", type);
return ERROR_INVALID;
}
return offset;
}
static gboolean
vmnc_dec_setcaps (GstPad * pad, GstCaps * caps)
{
/* We require a format descriptor in-stream, so we ignore the info from the
* container here. We just use the framerate */
GstVMncDec *dec = GST_VMNC_DEC (gst_pad_get_parent (pad));
if (gst_caps_get_size (caps) > 0) {
GstStructure *structure = gst_caps_get_structure (caps, 0);
/* We gave these a default in reset(), so we don't need to check for failure
* here */
gst_structure_get_fraction (structure, "framerate",
&dec->framerate_num, &dec->framerate_denom);
dec->parsed = TRUE;
} else {
GST_DEBUG_OBJECT (dec, "Unparsed input");
dec->parsed = FALSE;
}
gst_object_unref (dec);
return TRUE;
}
static GstFlowReturn
vmnc_dec_chain_frame (GstVMncDec * dec, GstBuffer * inbuf,
const guint8 * data, int len)
{
int res;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *outbuf;
res = vmnc_handle_packet (dec, data, len, TRUE);
if (res < 0) {
ret = GST_FLOW_ERROR;
GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL), ("Couldn't decode packet"));
} else {
GST_DEBUG_OBJECT (dec, "read %d bytes of %d", res, len);
/* inbuf may be NULL; that's ok */
outbuf = vmnc_make_buffer (dec, inbuf);
ret = gst_pad_push (dec->srcpad, outbuf);
}
return ret;
}
static GstFlowReturn
vmnc_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstVMncDec *dec;
GstFlowReturn ret = GST_FLOW_OK;
dec = GST_VMNC_DEC (gst_pad_get_parent (pad));
if (!dec->parsed) {
/* Submit our input buffer to adapter, then parse. Push each frame found
* through the decoder
*/
int avail;
const guint8 *data;
int read = 0;
gst_adapter_push (dec->adapter, buf);
avail = gst_adapter_available (dec->adapter);
data = gst_adapter_peek (dec->adapter, avail);
GST_DEBUG_OBJECT (dec, "Parsing %d bytes", avail);
while (TRUE) {
int len = vmnc_handle_packet (dec, data, avail, FALSE);
if (len == ERROR_INSUFFICIENT_DATA) {
GST_DEBUG_OBJECT (dec, "Not enough data yet");
ret = GST_FLOW_OK;
break;
} else if (len < 0) {
GST_DEBUG_OBJECT (dec, "Fatal error in bitstream");
ret = GST_FLOW_ERROR;
break;
}
GST_DEBUG_OBJECT (dec, "Parsed packet: %d bytes", len);
ret = vmnc_dec_chain_frame (dec, NULL, data, len);
avail -= len;
data += len;
read += len;
if (ret != GST_FLOW_OK)
break;
}
GST_DEBUG_OBJECT (dec, "Flushing %d bytes", read);
gst_adapter_flush (dec->adapter, read);
} else {
ret = vmnc_dec_chain_frame (dec, buf, GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
gst_buffer_unref (buf);
}
gst_object_unref (dec);
return ret;
}
static GstStateChangeReturn
vmnc_dec_change_state (GstElement * element, GstStateChange transition)
{
GstVMncDec *dec = GST_VMNC_DEC (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_vmnc_dec_reset (dec);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_vmnc_dec_reset (dec);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static void
vmnc_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
/*GstVMncDec *dec = GST_VMNC_DEC (object); */
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
vmnc_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
/*GstVMncDec *dec = GST_VMNC_DEC (object); */
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "vmncdec", GST_RANK_PRIMARY,
gst_vmnc_dec_get_type ()))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
vmnc,
"VmWare Video Codec plugins",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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