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Add Interplay MVE format demuxer/decoder and muxer/encoder. Demuxer doesn't support seeking yet, but seems to work fi...

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Original commit message from CVS:
Patch by: Jens Granseuer  <jensgr at gmx net>
* configure.ac:
* gst/mve/Makefile.am:
* gst/mve/TODO:
* gst/mve/gstmve.c:
* gst/mve/gstmvedemux.c:
* gst/mve/gstmvedemux.h:
* gst/mve/gstmvemux.c:
* gst/mve/gstmvemux.h:
* gst/mve/mve.h:
* gst/mve/mveaudiodec.c:
* gst/mve/mveaudioenc.c:
* gst/mve/mvevideodec16.c:
* gst/mve/mvevideodec8.c:
* gst/mve/mvevideoenc16.c:
* gst/mve/mvevideoenc8.c:
Add Interplay MVE format demuxer/decoder and muxer/encoder. Demuxer
doesn't support seeking yet, but seems to work fine otherwise.
Closes #348973.
This commit is contained in:
Jens Granseuer 2007-01-11 11:39:56 +00:00 committed by Tim-Philipp Müller
parent abe3e58b1b
commit 5dbec4ecf4
16 changed files with 8237 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
ChangeLog
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@ -1,3 +1,26 @@
2007-01-11 Tim-Philipp Müller <tim at centricular dot net>
Patch by: Jens Granseuer <jensgr at gmx net>
* configure.ac:
* gst/mve/Makefile.am:
* gst/mve/TODO:
* gst/mve/gstmve.c:
* gst/mve/gstmvedemux.c:
* gst/mve/gstmvedemux.h:
* gst/mve/gstmvemux.c:
* gst/mve/gstmvemux.h:
* gst/mve/mve.h:
* gst/mve/mveaudiodec.c:
* gst/mve/mveaudioenc.c:
* gst/mve/mvevideodec16.c:
* gst/mve/mvevideodec8.c:
* gst/mve/mvevideoenc16.c:
* gst/mve/mvevideoenc8.c:
Add Interplay MVE format demuxer/decoder and muxer/encoder. Demuxer
doesn't support seeking yet, but seems to work fine otherwise.
Closes #348973.
2007-01-09 Tim-Philipp Müller <tim at centricular dot net>
* gst/real/Makefile.am:

4
configure.ac
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@ -86,6 +86,7 @@ GST_PLUGINS_ALL="\
nuvdemux \
modplug \
multifile \
mve \
nsf \
replaygain \
spectrum \
@ -924,10 +925,11 @@ gst/h264parse/Makefile
gst/interleave/Makefile
gst/librfb/Makefile
gst/modplug/Makefile
gst/nuvdemux/Makefile
gst/modplug/libmodplug/Makefile
gst/multifile/Makefile
gst/mve/Makefile
gst/nsf/Makefile
gst/nuvdemux/Makefile
gst/replaygain/Makefile
gst/spectrum/Makefile
gst/speed/Makefile

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gst/mve/Makefile.am Normal file
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plugin_LTLIBRARIES = libgstmve.la
libgstmve_la_CFLAGS = $(GST_BASE_CFLAGS) $(GST_CFLAGS)
libgstmve_la_LIBADD = $(GST_BASE_LIBS) $(GST_LIBS)
libgstmve_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstmve_la_SOURCES = \
gstmve.c \
gstmvemux.c \
gstmvedemux.c \
mveaudiodec.c \
mvevideodec8.c \
mvevideodec16.c \
mveaudioenc.c \
mvevideoenc8.c \
mvevideoenc16.c
noinst_HEADERS = gstmvedemux.h gstmvemux.h mve.h
EXTRA_DIST = TODO

5
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MVE TODO:
- seeking support
- split out decoders from demuxer into separate elements
- split out encoders from muxer into separate elements

46
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/* GStreamer plugin for Interplay MVE movie files
*
* Copyright (C) 2006 Jens Granseuer <jensgr@gmx.net>
*
* 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.
*
* For more information about the Interplay MVE format, visit:
* http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "gstmvedemux.h"
#include "gstmvemux.h"
static gboolean
mve_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "mvedemux",
GST_RANK_PRIMARY,
GST_TYPE_MVE_DEMUX) &&
gst_element_register (plugin, "mvemux", GST_RANK_NONE, GST_TYPE_MVE_MUX);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mve",
"Interplay MVE movie format manipulation",
mve_plugin_init,
VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);

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/*
* GStreamer demultiplexer plugin for Interplay MVE movie files
*
* Copyright (C) 2006 Jens Granseuer <jensgr@gmx.net>
*
* 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_MVE_DEMUX_H__
#define __GST_MVE_DEMUX_H__
#include <gst/gst.h>
#include <gst/base/gstadapter.h>
G_BEGIN_DECLS
#define GST_TYPE_MVE_DEMUX \
(gst_mve_demux_get_type())
#define GST_MVE_DEMUX(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MVE_DEMUX,GstMveDemux))
#define GST_MVE_DEMUX_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MVE_DEMUX,GstMveDemuxClass))
#define GST_IS_MVE_DEMUX(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MVE_DEMUX))
#define GST_IS_MVE_DEMUX_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MVE_DEMUX))
typedef struct _GstMveDemux GstMveDemux;
typedef struct _GstMveDemuxClass GstMveDemuxClass;
typedef struct _GstMveDemuxStream GstMveDemuxStream;
struct _GstMveDemux
{
GstElement element;
GstPad *sinkpad;
GstMveDemuxStream *video_stream;
GstMveDemuxStream *audio_stream;
gint state;
/* time per frame (1/framerate) */
GstClockTime frame_duration;
/* push based variables */
guint16 needed_bytes;
GstAdapter *adapter;
/* size of current chunk */
guint32 chunk_size;
/* offset in current chunk */
guint32 chunk_offset;
};
struct _GstMveDemuxClass
{
GstElementClass parent_class;
};
struct _GstMveDemuxStream {
/* shared properties */
GstCaps *caps;
GstPad *pad;
GstClockTime last_ts;
gint64 offset;
/* video properties */
guint16 width;
guint16 height;
guint8 bpp; /* bytes per pixel */
guint8 *code_map;
gboolean code_map_avail;
guint8 *back_buf1;
guint8 *back_buf2;
guint32 max_block_offset;
GstBuffer *palette;
GstBuffer *buffer;
/* audio properties */
guint16 sample_rate;
guint16 n_channels;
guint16 sample_size;
gboolean compression;
};
GType gst_mve_demux_get_type (void);
G_END_DECLS
#endif /* __GST_MVE_DEMUX_H__ */

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/*
* Interplay MVE muxer plugin for GStreamer
* Copyright (C) 2006 Jens Granseuer <jensgr@gmx.net>
*
* 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_MVE_MUX_H__
#define __GST_MVE_MUX_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_TYPE_MVE_MUX \
(gst_mve_mux_get_type())
#define GST_MVE_MUX(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MVE_MUX,GstMveMux))
#define GST_MVE_MUX_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MVE_MUX,GstMveMux))
#define GST_IS_MVE_MUX(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MVE_MUX))
#define GST_IS_MVE_MUX_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MVE_MUX))
typedef struct _GstMveMux GstMveMux;
typedef struct _GstMveMuxClass GstMveMuxClass;
struct _GstMveMux {
GstElement element;
GMutex *lock;
/* pads */
GstPad *source;
GstPad *videosink;
GstPad *audiosink;
gboolean audio_pad_connected;
gboolean audio_pad_eos;
gboolean video_pad_connected;
gboolean video_pad_eos;
guint64 stream_offset;
/* audio stream time, really */
GstClockTime stream_time;
guint timer;
gint state;
/* ticks per frame */
GstClockTime frame_duration;
/* video stream properties */
guint16 width, height;
guint16 screen_width, screen_height;
/* bits per pixel */
guint8 bpp;
/* previous frames */
GstBuffer *last_frame;
GstBuffer *second_last_frame;
/* number of encoded frames */
guint16 video_frames;
/* palette handling */
gboolean pal_changed;
guint16 pal_first_color;
guint16 pal_colors;
/* whether to use expensive opcodes */
gboolean quick_encoding;
/* audio stream properties */
/* bits per sample */
guint8 bps;
guint32 rate;
guint8 channels;
gboolean compression;
/* current audio stream time */
GstClockTime next_ts;
/* maximum audio time we know about */
GstClockTime max_ts;
/* sample bytes per frame */
guint16 spf;
/* number of frames to use for audio lead-in */
guint16 lead_frames;
/* number of encoded frames */
guint16 audio_frames;
/* current chunk */
guint8 *chunk_code_map;
GByteArray *chunk_video;
GByteArray *chunk_audio;
gboolean chunk_has_palette;
gboolean chunk_has_audio;
/* buffers for incoming data */
GQueue *audio_buffer;
GQueue *video_buffer;
};
struct _GstMveMuxClass {
GstElementClass parent_class;
};
GType gst_mve_mux_get_type (void);
G_END_DECLS
#endif /* __GST_MVE_MUX_H__ */

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/*
* Interplay MVE movie definitions
*
* Copyright (C) 2006 Jens Granseuer <jensgr@gmx.net>
*
* 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 __MVE_H__
#define __MVE_H__
#define MVE_PREAMBLE "Interplay MVE File\032\000\032\000\000\001\063\021"
#define MVE_PREAMBLE_SIZE 26
#define MVE_PALETTE_COUNT 256
/* MVE chunk types */
#define MVE_CHUNK_INIT_AUDIO 0x0000
#define MVE_CHUNK_AUDIO_ONLY 0x0001
#define MVE_CHUNK_INIT_VIDEO 0x0002
#define MVE_CHUNK_VIDEO 0x0003
#define MVE_CHUNK_SHUTDOWN 0x0004
#define MVE_CHUNK_END 0x0005
/* MVE segment opcodes */
#define MVE_OC_END_OF_STREAM 0x00
#define MVE_OC_END_OF_CHUNK 0x01
#define MVE_OC_CREATE_TIMER 0x02
#define MVE_OC_AUDIO_BUFFERS 0x03
#define MVE_OC_PLAY_AUDIO 0x04
#define MVE_OC_VIDEO_BUFFERS 0x05
#define MVE_OC_PLAY_VIDEO 0x07
#define MVE_OC_AUDIO_DATA 0x08
#define MVE_OC_AUDIO_SILENCE 0x09
#define MVE_OC_VIDEO_MODE 0x0A
#define MVE_OC_PALETTE 0x0C
#define MVE_OC_PALETTE_COMPRESSED 0x0D
#define MVE_OC_CODE_MAP 0x0F
#define MVE_OC_VIDEO_DATA 0x11
/* audio flags */
#define MVE_AUDIO_STEREO 0x0001
#define MVE_AUDIO_16BIT 0x0002
#define MVE_AUDIO_COMPRESSED 0x0004
/* video flags */
#define MVE_VIDEO_DELTA_FRAME 0x0001
#endif /* __MVE_H__ */

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/*
* Copyright (c) 2003 The ffmpeg Project, Mike Melanson
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Interplay compressed audio codec by Mike Melanson (melanson@pcisys.net)
*/
#include <gst/gst.h>
static const short delta_table[256] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 47, 51, 56, 61,
66, 72, 79, 86, 94, 102, 112, 122, 133, 145, 158, 173, 189, 206, 225, 245,
267, 292, 318, 348, 379, 414, 452, 493, 538, 587, 640, 699, 763, 832, 908,
991,
1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, 2175, 2373, 2590, 2826, 3084,
3365, 3672, 4008,
4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, 8794, 9597, 10472, 11428,
12471, 13609, 14851, 16206,
17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, -29973, -26728,
-23186, -19322, -15105, -10503, -5481, -1,
1, 1, 5481, 10503, 15105, 19322, 23186, 26728, 29973, -32589, -29864, -27367,
-25078, -22981, -21060, -19298,
-17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, -8794, -8059,
-7385, -6767, -6202, -5683, -5208, -4772,
-4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, -2175, -1993, -1826,
-1673, -1534, -1405, -1288, -1180,
-1081, -991, -908, -832, -763, -699, -640, -587, -538, -493, -452, -414, -379,
-348, -318, -292,
-267, -245, -225, -206, -189, -173, -158, -145, -133, -122, -112, -102, -94,
-86, -79, -72,
-66, -61, -56, -51, -47, -43, -42, -41, -40, -39, -38, -37, -36, -35, -34,
-33,
-32, -31, -30, -29, -28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18,
-17,
-16, -15, -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1
};
void
ipaudio_uncompress (short *buffer, unsigned short buf_len,
const unsigned char *data, unsigned char channels)
{
int i, out = 0;
int predictor[2];
int channel_number = 0;
for (i = 0; i < channels; ++i) {
predictor[i] = GST_READ_UINT16_LE (data);
data += 2;
if (predictor[i] & 0x8000)
predictor[i] -= 0x10000;
buffer[out++] = predictor[i];
}
/* we count in 16-bit ints, so adjust the buffer size */
buf_len /= 2;
while (out < buf_len) {
predictor[channel_number] += delta_table[*data++];
if (predictor[channel_number] < -32768)
predictor[channel_number] = -32768;
else if (predictor[channel_number] > 32767)
predictor[channel_number] = 32767;
buffer[out++] = predictor[channel_number];
/* toggle channel */
channel_number ^= channels - 1;
}
}

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/*
* Interplay MVE audio compressor
* Copyright (C) 2003, 2004 Alexander Belyakov <abel@krasu.ru>
* Copyright (C) 2006 Jens Granseuer <jensgr@gmx.net>
*
* 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.
*/
#include <math.h>
#include <gst/gst.h>
static const gint32 dec_table[256] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
38, 39, 40, 41, 42, 43, 47, 51, 56, 61, 66, 72, 79, 86, 94, 102, 112,
122, 133, 145, 158, 173, 189, 206, 225, 245, 267, 292, 318, 348, 379,
414, 452, 493, 538, 587, 640, 699, 763, 832, 908, 991, 1081, 1180, 1288,
1405, 1534, 1673, 1826, 1993, 2175, 2373, 2590, 2826, 3084, 3365, 3672,
4008, 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, 8794, 9597, 10472,
11428, 12471, 13609, 14851, 16206, 17685, 19298, 21060, 22981, 25078,
27367, 29864, 32589, 35563, 38808, 42350, 46214, 50431, 55033, 60055,
65535, 1, -65535, -60055, -55033, -50431, -46214, -42350, -38808, -35563,
-32589, -29864, -27367, -25078, -22981, -21060, -19298, -17685, -16206,
-14851, -13609, -12471, -11428, -10472, -9597, -8794, -8059, -7385, -6767,
-6202, -5683, -5208, -4772, -4373, -4008, -3672, -3365, -3084, -2826,
-2590, -2373, -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180,
-1081, -991, -908, -832, -763, -699, -640, -587, -538, -493, -452, -414,
-379, -348, -318, -292, -267, -245, -225, -206, -189, -173, -158, -145,
-133, -122, -112, -102, -94, -86, -79, -72, -66, -61, -56, -51, -47, -43,
-42, -41, -40, -39, -38, -37, -36, -35, -34, -33, -32, -31, -30, -29,
-28, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18, -17, -16, -15,
-14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1
};
/* This value could be non-optimal. Without knowledge of the value
distribution in the real signal, the actual optimum cannot be evaluated.
Should be somewhere between 11.458 and 11.542. */
static const gdouble DPCM_SCALE = 11.5131;
static gint8
mve_enc_delta (guint n)
{
if (n < 44)
return n;
return floor (DPCM_SCALE * log (n));
}
gint
mve_compress_audio (guint8 * dest, const guint8 * src, guint16 len,
guint8 channels)
{
gint16 prev[2], s;
gint delta, real_res;
gint cur_chan;
guint8 v;
for (cur_chan = 0; cur_chan < channels; ++cur_chan) {
prev[cur_chan] = GST_READ_UINT16_LE (src);
GST_WRITE_UINT16_LE (dest, prev[cur_chan]);
src += 2;
dest += 2;
len -= 2;
}
cur_chan = 0;
while (len > 0) {
s = GST_READ_UINT16_LE (src);
src += 2;
delta = s - prev[cur_chan];
if (delta >= 0)
v = mve_enc_delta (delta);
else
v = 256 - mve_enc_delta (-delta);
real_res = dec_table[v] + prev[cur_chan];
if (real_res < -32768 || real_res > 32767) {
/* correct overflow */
/* GST_DEBUG ("co:%d + %d = %d -> new v:%d, dec_table:%d will be %d",
prev[cur_chan], dec_table[v], real_res,
v, dec_table[v], prev[cur_chan]+dec_table[v]); */
if (s > 0) {
if (real_res > 32767)
--v;
} else {
if (real_res < -32768)
++v;
}
real_res = dec_table[v] + prev[cur_chan];
}
if (G_UNLIKELY (abs (real_res - s) > 32767)) {
GST_ERROR ("sign loss left unfixed in audio stream, deviation:%ld",
real_res - s);
return -1;
}
*dest++ = v;
--len;
/* use previous output instead of input. That way output will not go too far from input. */
prev[cur_chan] += dec_table[v];
cur_chan = channels - 1 - cur_chan;
}
return 0;
}

849
gst/mve/mvevideodec16.c Normal file
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@ -0,0 +1,849 @@
/*
* Interplay MVE Video Decoder (16 bit)
* Copyright (C) 2003 the ffmpeg project, Mike Melanson
* (C) 2006 Jens Granseuer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* For more information about the Interplay MVE format, visit:
* http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
*/
#include "gstmvedemux.h"
#include <string.h>
#define PIXEL(s) GST_READ_UINT16_LE (s)
#define CHECK_STREAM(l, n) \
do { \
if (G_UNLIKELY (*(l) < (n))) { \
GST_ERROR ("wanted to read %d bytes from stream, %d available", (n), *(l)); \
return -1; \
} \
*(l) -= (n); \
} while (0)
/* copy an 8x8 block from the stream to the frame buffer */
static int
ipvideo_copy_block (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned short *src, int offset)
{
int i;
int frame_offset;
frame_offset = frame - (unsigned short *) s->back_buf1 + offset;
if (G_UNLIKELY (frame_offset < 0)) {
GST_ERROR ("frame offset < 0 (%ld)", frame_offset);
return -1;
} else if (G_UNLIKELY (frame_offset > s->max_block_offset)) {
GST_ERROR ("frame offset above limit (%ld > %ld)",
frame_offset, s->max_block_offset);
return -1;
}
for (i = 0; i < 8; ++i) {
memcpy (frame, src, 16);
frame += s->width;
src += s->width;
}
return 0;
}
static int
ipvideo_decode_0x2 (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
unsigned char B;
int x, y;
int offset;
/* copy block from 2 frames ago using a motion vector */
CHECK_STREAM (len, 1);
B = *(*data)++;
if (B < 56) {
x = 8 + (B % 7);
y = B / 7;
} else {
x = -14 + ((B - 56) % 29);
y = 8 + ((B - 56) / 29);
}
offset = y * s->width + x;
return ipvideo_copy_block (s, frame, frame + offset, offset);
}
static int
ipvideo_decode_0x3 (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
unsigned char B;
int x, y;
int offset;
/* copy 8x8 block from current frame from an up/left block */
CHECK_STREAM (len, 1);
B = *(*data)++;
if (B < 56) {
x = -(8 + (B % 7));
y = -(B / 7);
} else {
x = -(-14 + ((B - 56) % 29));
y = -(8 + ((B - 56) / 29));
}
offset = y * s->width + x;
return ipvideo_copy_block (s, frame, frame + offset, offset);
}
static int
ipvideo_decode_0x4 (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char B;
int offset;
/* copy a block from the previous frame */
CHECK_STREAM (len, 1);
B = *(*data)++;
x = -8 + (B & 0x0F);
y = -8 + (B >> 4);
offset = y * s->width + x;
return ipvideo_copy_block (s, frame, frame +
((unsigned short *) s->back_buf2 - (unsigned short *) s->back_buf1) +
offset, offset);
}
static int
ipvideo_decode_0x5 (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
signed char x, y;
int offset;
/* copy a block from the previous frame using an expanded range */
CHECK_STREAM (len, 2);
x = (signed char) *(*data)++;
y = (signed char) *(*data)++;
offset = y * s->width + x;
return ipvideo_copy_block (s, frame, frame +
((unsigned short *) s->back_buf2 - (unsigned short *) s->back_buf1) +
offset, offset);
}
static int
ipvideo_decode_0x7 (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short P0, P1;
unsigned int flags;
int bitmask;
/* 2-color encoding */
CHECK_STREAM (len, 4 + 2);
P0 = PIXEL (*data);
(*data) += 2;
P1 = PIXEL (*data);
(*data) += 2;
if (!(P0 & 0x8000)) {
/* need 8 more bytes from the stream */
CHECK_STREAM (len, 8 - 2);
for (y = 0; y < 8; ++y) {
flags = *(*data)++;
for (x = 0x01; x <= 0x80; x <<= 1) {
if (flags & x)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
} else {
P0 &= ~0x8000;
/* need 2 more bytes from the stream */
flags = ((*data)[1] << 8) | (*data)[0];
(*data) += 2;
bitmask = 0x0001;
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, bitmask <<= 1) {
if (flags & bitmask) {
*(frame + x) = P1;
*(frame + x + 1) = P1;
*(frame + s->width + x) = P1;
*(frame + s->width + x + 1) = P1;
} else {
*(frame + x) = P0;
*(frame + x + 1) = P0;
*(frame + s->width + x) = P0;
*(frame + s->width + x + 1) = P0;
}
}
frame += s->width * 2;
}
}
return 0;
}
static int
ipvideo_decode_0x8 (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short P[8];
unsigned char B[8];
unsigned int flags = 0;
unsigned int bitmask = 0;
unsigned short P0 = 0, P1 = 0;
int lower_half = 0;
/* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM (len, 6 + 10);
P[0] = PIXEL (*data);
(*data) += 2;
P[1] = PIXEL (*data);
(*data) += 2;
B[0] = *(*data)++;
B[1] = *(*data)++;
if (!(P[0] & 0x8000)) {
/* need 18 more bytes */
CHECK_STREAM (len, 18 - 10);
P[2] = PIXEL (*data);
(*data) += 2;
P[3] = PIXEL (*data);
(*data) += 2;
B[2] = *(*data)++;
B[3] = *(*data)++;
P[4] = PIXEL (*data);
(*data) += 2;
P[5] = PIXEL (*data);
(*data) += 2;
B[4] = *(*data)++;
B[5] = *(*data)++;
P[6] = PIXEL (*data);
(*data) += 2;
P[7] = PIXEL (*data);
(*data) += 2;
B[6] = *(*data)++;
B[7] = *(*data)++;
flags =
((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
((B[0] & 0x0F)) | ((B[4] & 0x0F) << 4) |
((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
bitmask = 0x00000001;
lower_half = 0; /* still on top half */
for (y = 0; y < 8; ++y) {
/* time to reload flags? */
if (y == 4) {
flags =
((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
((B[2] & 0x0F)) | ((B[6] & 0x0F) << 4) |
((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
bitmask = 0x00000001;
lower_half = 2;
}
/* get the pixel values ready for this quadrant */
P0 = P[lower_half + 0];
P1 = P[lower_half + 1];
for (x = 0; x < 8; ++x, bitmask <<= 1) {
if (x == 4) {
P0 = P[lower_half + 4];
P1 = P[lower_half + 5];
}
if (flags & bitmask)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
} else {
P[0] &= ~0x8000;
/* need 10 more bytes */
B[2] = *(*data)++;
B[3] = *(*data)++;
P[2] = PIXEL (*data);
(*data) += 2;
P[3] = PIXEL (*data);
(*data) += 2;
B[4] = *(*data)++;
B[5] = *(*data)++;
B[6] = *(*data)++;
B[7] = *(*data)++;
if (!(P[2] & 0x8000)) {
/* vertical split; left & right halves are 2-color encoded */
flags =
((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
((B[0] & 0x0F)) | ((B[4] & 0x0F) << 4) |
((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
bitmask = 0x00000001;
for (y = 0; y < 8; ++y) {
/* time to reload flags? */
if (y == 4) {
flags =
((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
((B[2] & 0x0F)) | ((B[6] & 0x0F) << 4) |
((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
bitmask = 0x00000001;
}
/* get the pixel values ready for this half */
P0 = P[0];
P1 = P[1];
for (x = 0; x < 8; ++x, bitmask <<= 1) {
if (x == 4) {
P0 = P[2];
P1 = P[3];
}
if (flags & bitmask)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
} else {
/* horizontal split; top & bottom halves are 2-color encoded */
P0 = P[0];
P1 = P[1];
for (y = 0; y < 8; ++y) {
flags = B[y];
if (y == 4) {
P0 = P[2] & ~0x8000;
P1 = P[3];
}
for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
if (flags & bitmask)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
}
}
return 0;
}
static int
ipvideo_decode_0x9 (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short P[4];
unsigned char B[4];
unsigned int flags = 0;
int shifter = 0;
unsigned short pix;
/* 4-color encoding */
CHECK_STREAM (len, 8 + 4);
P[0] = PIXEL (*data);
(*data) += 2;
P[1] = PIXEL (*data);
(*data) += 2;
P[2] = PIXEL (*data);
(*data) += 2;
P[3] = PIXEL (*data);
(*data) += 2;
if (!(P[0] & 0x8000) && !(P[2] & 0x8000)) {
/* 1 of 4 colors for each pixel, need 16 more bytes */
CHECK_STREAM (len, 16 - 4);
for (y = 0; y < 8; ++y) {
/* get the next set of 8 2-bit flags */
flags = ((*data)[1] << 8) | (*data)[0];
(*data) += 2;
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2) {
*frame++ = P[(flags >> shifter) & 0x03];
}
frame += s->width - 8;
}
} else if (!(P[0] & 0x8000) && (P[2] & 0x8000)) {
P[2] &= ~0x8000;
/* 1 of 4 colors for each 2x2 block, need 4 more bytes */
B[0] = *(*data)++;
B[1] = *(*data)++;
B[2] = *(*data)++;
B[3] = *(*data)++;
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
shifter = 0;
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
*(frame + x) = pix;
*(frame + x + 1) = pix;
*(frame + s->width + x) = pix;
*(frame + s->width + x + 1) = pix;
}
frame += s->width * 2;
}
} else if ((P[0] & 0x8000) && !(P[2] & 0x8000)) {
P[0] &= ~0x8000;
/* 1 of 4 colors for each 2x1 block, need 8 more bytes */
CHECK_STREAM (len, 8 - 4);
for (y = 0; y < 8; ++y) {
/* time to reload flags? */
if ((y == 0) || (y == 4)) {
B[0] = *(*data)++;
B[1] = *(*data)++;
B[2] = *(*data)++;
B[3] = *(*data)++;
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
shifter = 0;
}
for (x = 0; x < 8; x += 2, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
*(frame + x) = pix;
*(frame + x + 1) = pix;
}
frame += s->width;
}
} else {
P[0] &= ~0x8000;
P[2] &= ~0x8000;
/* 1 of 4 colors for each 1x2 block, need 8 more bytes */
CHECK_STREAM (len, 8 - 4);
for (y = 0; y < 8; y += 2) {
/* time to reload flags? */
if ((y == 0) || (y == 4)) {
B[0] = *(*data)++;
B[1] = *(*data)++;
B[2] = *(*data)++;
B[3] = *(*data)++;
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
shifter = 0;
}
for (x = 0; x < 8; ++x, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
*(frame + x) = pix;
*(frame + s->width + x) = pix;
}
frame += s->width * 2;
}
}
return 0;
}
static int
ipvideo_decode_0xa (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short P[16];
unsigned char B[16];
int flags = 0;
int shifter = 0;
int index;
int split;
int lower_half;
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM (len, 8 + 24);
P[0] = PIXEL (*data);
(*data) += 2;
P[1] = PIXEL (*data);
(*data) += 2;
P[2] = PIXEL (*data);
(*data) += 2;
P[3] = PIXEL (*data);
(*data) += 2;
if (!(P[0] & 0x8000)) {
/* 4-color encoding for each quadrant; need 40 more bytes */
CHECK_STREAM (len, 40 - 24);
B[0] = *(*data)++;
B[1] = *(*data)++;
B[2] = *(*data)++;
B[3] = *(*data)++;
for (y = 4; y < 16; y += 4) {
for (x = y; x < y + 4; ++x) {
P[x] = PIXEL (*data);
(*data) += 2;
}
for (x = y; x < y + 4; ++x)
B[x] = *(*data)++;
}
for (y = 0; y < 8; ++y) {
lower_half = (y >= 4) ? 4 : 0;
flags = (B[y + 8] << 8) | B[y];
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2) {
split = (x >= 4) ? 8 : 0;
index = split + lower_half + ((flags >> shifter) & 0x03);
*frame++ = P[index];
}
frame += s->width - 8;
}
} else {
P[0] &= ~0x8000;
/* 4-color encoding for either left and right or top and bottom
* halves; need 24 more bytes */
memcpy (&B[0], *data, 8);
(*data) += 8;
P[4] = PIXEL (*data);
(*data) += 2;
P[5] = PIXEL (*data);
(*data) += 2;
P[6] = PIXEL (*data);
(*data) += 2;
P[7] = PIXEL (*data);
(*data) += 2;
memcpy (&B[8], *data, 8);
(*data) += 8;
if (!(P[4] & 0x8000)) {
/* block is divided into left and right halves */
for (y = 0; y < 8; ++y) {
flags = (B[y + 8] << 8) | B[y];
split = 0;
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2) {
if (x == 4)
split = 4;
*frame++ = P[split + ((flags >> shifter) & 0x03)];
}
frame += s->width - 8;
}
} else {
P[4] &= ~0x8000;
/* block is divided into top and bottom halves */
split = 0;
for (y = 0; y < 8; ++y) {
flags = (B[y * 2 + 1] << 8) | B[y * 2];
if (y == 4)
split = 4;
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2)
*frame++ = P[split + ((flags >> shifter) & 0x03)];
frame += s->width - 8;
}
}
}
return 0;
}
static int
ipvideo_decode_0xb (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
/* 64-color encoding (each pixel in block is a different color) */
CHECK_STREAM (len, 128);
for (y = 0; y < 8; ++y) {
for (x = 0; x < 8; ++x) {
*frame++ = PIXEL (*data);
(*data) += 2;
}
frame += s->width - 8;
}
return 0;
}
static int
ipvideo_decode_0xc (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short pix;
/* 16-color block encoding: each 2x2 block is a different color */
CHECK_STREAM (len, 32);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2) {
pix = PIXEL (*data);
(*data) += 2;
*(frame + x) = pix;
*(frame + x + 1) = pix;
*(frame + s->width + x) = pix;
*(frame + s->width + x + 1) = pix;
}
frame += s->width * 2;
}
return 0;
}
static int
ipvideo_decode_0xd (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short P[4];
unsigned char index = 0;
/* 4-color block encoding: each 4x4 block is a different color */
CHECK_STREAM (len, 8);
P[0] = PIXEL (*data);
(*data) += 2;
P[1] = PIXEL (*data);
(*data) += 2;
P[2] = PIXEL (*data);
(*data) += 2;
P[3] = PIXEL (*data);
(*data) += 2;
for (y = 0; y < 8; ++y) {
if (y < 4)
index = 0;
else
index = 2;
for (x = 0; x < 8; ++x) {
if (x == 4)
++index;
*frame++ = P[index];
}
frame += s->width - 8;
}
return 0;
}
static int
ipvideo_decode_0xe (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short pix;
/* 1-color encoding: the whole block is 1 solid color */
CHECK_STREAM (len, 2);
pix = PIXEL (*data);
(*data) += 2;
for (y = 0; y < 8; ++y) {
for (x = 0; x < 8; ++x) {
*frame++ = pix;
}
frame += s->width - 8;
}
return 0;
}
static int
ipvideo_decode_0xf (const GstMveDemuxStream * s, unsigned short *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned short P[2];
/* dithered encoding */
CHECK_STREAM (len, 4);
P[0] = PIXEL (*data);
(*data) += 2;
P[1] = PIXEL (*data);
(*data) += 2;
for (y = 0; y < 8; ++y) {
for (x = 0; x < 4; ++x) {
*frame++ = P[y & 1];
*frame++ = P[(y & 1) ^ 1];
}
frame += s->width - 8;
}
return 0;
}
int
ipvideo_decode_frame16 (const GstMveDemuxStream * s, const unsigned char *data,
unsigned short len)
{
int rc = 0;
int x, y, xx, yy;
int index = 0;
unsigned short offset;
unsigned char opcode;
unsigned short *frame;
const unsigned char *data2;
unsigned short len2;
CHECK_STREAM (&len, 2);
offset = (data[1] << 8) | data[0];
data2 = data + offset;
len2 = len - offset + 2;
data += 2;
frame = (unsigned short *) s->back_buf1;
/* decoding is done in 8x8 blocks */
xx = s->width >> 3;
yy = s->height >> 3;
for (y = 0; y < yy; ++y) {
for (x = 0; x < xx; ++x) {
/* decoding map contains 4 bits of information per 8x8 block */
/* bottom nibble first, then top nibble */
if (index & 1)
opcode = s->code_map[index >> 1] >> 4;
else
opcode = s->code_map[index >> 1] & 0x0F;
++index;
/* GST_DEBUG ("block @ (%3d, %3d): encoding 0x%X, data ptr @ %p",
x, y, opcode, data); */
switch (opcode) {
case 0x0:
/* copy a block from the previous frame */
rc = ipvideo_copy_block (s, frame, frame +
((unsigned short *) s->back_buf2 -
(unsigned short *) s->back_buf1), 0);
break;
case 0x1:
/* copy block from 2 frames ago; since we switched the back
* buffers we don't actually have to do anything here */
break;
case 0x2:
rc = ipvideo_decode_0x2 (s, frame, &data2, &len2);
break;
case 0x3:
rc = ipvideo_decode_0x3 (s, frame, &data2, &len2);
break;
case 0x4:
rc = ipvideo_decode_0x4 (s, frame, &data2, &len2);
break;
case 0x5:
rc = ipvideo_decode_0x5 (s, frame, &data, &len);
break;
case 0x6:
/* mystery opcode? skip multiple blocks? */
GST_WARNING ("encountered unsupported opcode 0x6");
rc = -1;
break;
case 0x7:
rc = ipvideo_decode_0x7 (s, frame, &data, &len);
break;
case 0x8:
rc = ipvideo_decode_0x8 (s, frame, &data, &len);
break;
case 0x9:
rc = ipvideo_decode_0x9 (s, frame, &data, &len);
break;
case 0xa:
rc = ipvideo_decode_0xa (s, frame, &data, &len);
break;
case 0xb:
rc = ipvideo_decode_0xb (s, frame, &data, &len);
break;
case 0xc:
rc = ipvideo_decode_0xc (s, frame, &data, &len);
break;
case 0xd:
rc = ipvideo_decode_0xd (s, frame, &data, &len);
break;
case 0xe:
rc = ipvideo_decode_0xe (s, frame, &data, &len);
break;
case 0xf:
rc = ipvideo_decode_0xf (s, frame, &data, &len);
break;
}
if (rc != 0)
return rc;
frame += 8;
}
frame += 7 * s->width;
}
return 0;
}

802
gst/mve/mvevideodec8.c Normal file
View file

@ -0,0 +1,802 @@
/*
* Interplay MVE Video Decoder (8 bit)
* Copyright (C) 2003 the ffmpeg project, Mike Melanson
* (C) 2006 Jens Granseuer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* For more information about the Interplay MVE format, visit:
* http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
*/
#include "gstmvedemux.h"
#include <string.h>
#define CHECK_STREAM(l, n) \
do { \
if (G_UNLIKELY (*(l) < (n))) { \
GST_ERROR ("wanted to read %d bytes from stream, %d available", (n), *(l)); \
return -1; \
} \
*(l) -= (n); \
} while (0)
/* copy an 8x8 block from the stream to the frame buffer */
static int
ipvideo_copy_block (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char *src, int offset)
{
int i;
long frame_offset;
frame_offset = frame - s->back_buf1 + offset;
if (G_UNLIKELY (frame_offset < 0)) {
GST_ERROR ("frame offset < 0 (%ld)", frame_offset);
return -1;
} else if (G_UNLIKELY (frame_offset > s->max_block_offset)) {
GST_ERROR ("frame offset above limit (%ld > %ld)",
frame_offset, s->max_block_offset);
return -1;
}
for (i = 0; i < 8; ++i) {
memcpy (frame, src, 8);
frame += s->width;
src += s->width;
}
return 0;
}
static int
ipvideo_decode_0x2 (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
unsigned char B;
int x, y;
int offset;
/* copy block from 2 frames ago using a motion vector */
CHECK_STREAM (len, 1);
B = *(*data)++;
if (B < 56) {
x = 8 + (B % 7);
y = B / 7;
} else {
x = -14 + ((B - 56) % 29);
y = 8 + ((B - 56) / 29);
}
offset = y * s->width + x;
return ipvideo_copy_block (s, frame, frame + offset, offset);
}
static int
ipvideo_decode_0x3 (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
unsigned char B;
int x, y;
int offset;
/* copy 8x8 block from current frame from an up/left block */
CHECK_STREAM (len, 1);
B = *(*data)++;
if (B < 56) {
x = -(8 + (B % 7));
y = -(B / 7);
} else {
x = -(-14 + ((B - 56) % 29));
y = -(8 + ((B - 56) / 29));
}
offset = y * s->width + x;
return ipvideo_copy_block (s, frame, frame + offset, offset);
}
static int
ipvideo_decode_0x4 (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
unsigned char B;
int x, y;
int offset;
/* copy a block from the previous frame */
CHECK_STREAM (len, 1);
B = *(*data)++;
x = -8 + (B & 0x0F);
y = -8 + (B >> 4);
offset = y * s->width + x;
return ipvideo_copy_block (s, frame,
frame + (s->back_buf2 - s->back_buf1) + offset, offset);
}
static int
ipvideo_decode_0x5 (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
signed char x, y;
int offset;
/* copy a block from the previous frame using an expanded range */
CHECK_STREAM (len, 2);
x = (signed char) *(*data)++;
y = (signed char) *(*data)++;
offset = y * s->width + x;
return ipvideo_copy_block (s, frame,
frame + (s->back_buf2 - s->back_buf1) + offset, offset);
}
static int
ipvideo_decode_0x7 (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char P0, P1;
unsigned int flags;
int bitmask;
/* 2-color encoding */
CHECK_STREAM (len, 2 + 2);
P0 = *(*data)++;
P1 = *(*data)++;
if (P0 <= P1) {
/* need 8 more bytes from the stream */
CHECK_STREAM (len, 8 - 2);
for (y = 0; y < 8; ++y) {
flags = *(*data)++;
for (x = 0x01; x <= 0x80; x <<= 1) {
if (flags & x)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
} else {
/* need 2 more bytes from the stream */
flags = ((*data)[1] << 8) | (*data)[0];
(*data) += 2;
bitmask = 0x0001;
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, bitmask <<= 1) {
if (flags & bitmask) {
*(frame + x) = P1;
*(frame + x + 1) = P1;
*(frame + s->width + x) = P1;
*(frame + s->width + x + 1) = P1;
} else {
*(frame + x) = P0;
*(frame + x + 1) = P0;
*(frame + s->width + x) = P0;
*(frame + s->width + x + 1) = P0;
}
}
frame += s->width * 2;
}
}
return 0;
}
static int
ipvideo_decode_0x8 (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char P[8];
unsigned char B[8];
unsigned int flags = 0;
unsigned int bitmask = 0;
unsigned char P0 = 0, P1 = 0;
int lower_half = 0;
/* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM (len, 4 + 8);
P[0] = (*data)[0];
P[1] = (*data)[1];
B[0] = (*data)[2];
B[1] = (*data)[3];
(*data) += 4;
if (P[0] <= P[1]) {
/* need 12 more bytes */
CHECK_STREAM (len, 12 - 8);
P[2] = (*data)[0];
P[3] = (*data)[1];
B[2] = (*data)[2];
B[3] = (*data)[3];
P[4] = (*data)[4];
P[5] = (*data)[5];
B[4] = (*data)[6];
B[5] = (*data)[7];
P[6] = (*data)[8];
P[7] = (*data)[9];
B[6] = (*data)[10];
B[7] = (*data)[11];
(*data) += 12;
flags =
((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
((B[0] & 0x0F)) | ((B[4] & 0x0F) << 4) |
((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
bitmask = 0x00000001;
lower_half = 0; /* still on top half */
for (y = 0; y < 8; ++y) {
/* time to reload flags? */
if (y == 4) {
flags =
((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
((B[2] & 0x0F)) | ((B[6] & 0x0F) << 4) |
((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
bitmask = 0x00000001;
lower_half = 2;
}
/* get the pixel values ready for this quadrant */
P0 = P[lower_half + 0];
P1 = P[lower_half + 1];
for (x = 0; x < 8; ++x, bitmask <<= 1) {
if (x == 4) {
P0 = P[lower_half + 4];
P1 = P[lower_half + 5];
}
if (flags & bitmask)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
} else {
/* need 8 more bytes */
B[2] = (*data)[0];
B[3] = (*data)[1];
P[2] = (*data)[2];
P[3] = (*data)[3];
B[4] = (*data)[4];
B[5] = (*data)[5];
B[6] = (*data)[6];
B[7] = (*data)[7];
(*data) += 8;
if (P[2] <= P[3]) {
/* vertical split; left & right halves are 2-color encoded */
flags =
((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
((B[0] & 0x0F)) | ((B[4] & 0x0F) << 4) |
((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
bitmask = 0x00000001;
for (y = 0; y < 8; ++y) {
/* time to reload flags? */
if (y == 4) {
flags =
((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
((B[2] & 0x0F)) | ((B[6] & 0x0F) << 4) |
((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
bitmask = 0x00000001;
}
/* get the pixel values ready for this half */
P0 = P[0];
P1 = P[1];
for (x = 0; x < 8; ++x, bitmask <<= 1) {
if (x == 4) {
P0 = P[2];
P1 = P[3];
}
if (flags & bitmask)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
} else {
/* horizontal split; top & bottom halves are 2-color encoded */
P0 = P[0];
P1 = P[1];
for (y = 0; y < 8; ++y) {
flags = B[y];
if (y == 4) {
P0 = P[2];
P1 = P[3];
}
for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
if (flags & bitmask)
*frame++ = P1;
else
*frame++ = P0;
}
frame += s->width - 8;
}
}
}
return 0;
}
static int
ipvideo_decode_0x9 (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char P[4];
unsigned char B[4];
unsigned long flags = 0;
int shifter = 0;
unsigned char pix;
/* 4-color encoding */
CHECK_STREAM (len, 4 + 4);
P[0] = (*data)[0];
P[1] = (*data)[1];
P[2] = (*data)[2];
P[3] = (*data)[3];
(*data) += 4;
if ((P[0] <= P[1]) && (P[2] <= P[3])) {
/* 1 of 4 colors for each pixel, need 16 more bytes */
CHECK_STREAM (len, 16 - 4);
for (y = 0; y < 8; ++y) {
/* get the next set of 8 2-bit flags */
flags = ((*data)[1] << 8) | (*data)[0];
(*data) += 2;
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2) {
*frame++ = P[(flags >> shifter) & 0x03];
}
frame += s->width - 8;
}
} else if ((P[0] <= P[1]) && (P[2] > P[3])) {
/* 1 of 4 colors for each 2x2 block, need 4 more bytes */
B[0] = (*data)[0];
B[1] = (*data)[1];
B[2] = (*data)[2];
B[3] = (*data)[3];
(*data) += 4;
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
shifter = 0;
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
*(frame + x) = pix;
*(frame + x + 1) = pix;
*(frame + s->width + x) = pix;
*(frame + s->width + x + 1) = pix;
}
frame += s->width * 2;
}
} else if ((P[0] > P[1]) && (P[2] <= P[3])) {
/* 1 of 4 colors for each 2x1 block, need 8 more bytes */
CHECK_STREAM (len, 8 - 4);
for (y = 0; y < 8; ++y) {
/* time to reload flags? */
if ((y == 0) || (y == 4)) {
B[0] = (*data)[0];
B[1] = (*data)[1];
B[2] = (*data)[2];
B[3] = (*data)[3];
(*data) += 4;
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
shifter = 0;
}
for (x = 0; x < 8; x += 2, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
*(frame + x) = pix;
*(frame + x + 1) = pix;
}
frame += s->width;
}
} else {
/* 1 of 4 colors for each 1x2 block, need 8 more bytes */
CHECK_STREAM (len, 8 - 4);
for (y = 0; y < 8; y += 2) {
/* time to reload flags? */
if ((y == 0) || (y == 4)) {
B[0] = (*data)[0];
B[1] = (*data)[1];
B[2] = (*data)[2];
B[3] = (*data)[3];
(*data) += 4;
flags = (B[3] << 24) | (B[2] << 16) | (B[1] << 8) | B[0];
shifter = 0;
}
for (x = 0; x < 8; ++x, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
*(frame + x) = pix;
*(frame + s->width + x) = pix;
}
frame += s->width * 2;
}
}
return 0;
}
static int
ipvideo_decode_0xa (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char P[16];
unsigned char B[16];
int flags = 0;
int shifter = 0;
int index;
int split;
int lower_half;
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
* either top and bottom or left and right halves */
CHECK_STREAM (len, 8 + 16);
P[0] = (*data)[0];
P[1] = (*data)[1];
P[2] = (*data)[2];
P[3] = (*data)[3];
B[0] = (*data)[4];
B[1] = (*data)[5];
B[2] = (*data)[6];
B[3] = (*data)[7];
(*data) += 8;
if (P[0] <= P[1]) {
/* 4-color encoding for each quadrant; need 24 more bytes */
CHECK_STREAM (len, 24 - 16);
for (y = 4; y < 16; y += 4) {
for (x = y; x < y + 4; ++x)
P[x] = *(*data)++;
for (x = y; x < y + 4; ++x)
B[x] = *(*data)++;
}
for (y = 0; y < 8; ++y) {
lower_half = (y >= 4) ? 4 : 0;
flags = (B[y + 8] << 8) | B[y];
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2) {
split = (x >= 4) ? 8 : 0;
index = split + lower_half + ((flags >> shifter) & 0x03);
*frame++ = P[index];
}
frame += s->width - 8;
}
} else {
/* 4-color encoding for either left and right or top and bottom
* halves; need 16 more bytes */
B[4] = (*data)[0];
B[5] = (*data)[1];
B[6] = (*data)[2];
B[7] = (*data)[3];
P[4] = (*data)[4];
P[5] = (*data)[5];
P[6] = (*data)[6];
P[7] = (*data)[7];
(*data) += 8;
memcpy (&B[8], *data, 8);
(*data) += 8;
if (P[4] <= P[5]) {
/* block is divided into left and right halves */
for (y = 0; y < 8; ++y) {
flags = (B[y + 8] << 8) | B[y];
split = 0;
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2) {
if (x == 4)
split = 4;
*frame++ = P[split + ((flags >> shifter) & 0x03)];
}
frame += s->width - 8;
}
} else {
/* block is divided into top and bottom halves */
split = 0;
for (y = 0; y < 8; ++y) {
flags = (B[y * 2 + 1] << 8) | B[y * 2];
if (y == 4)
split = 4;
for (x = 0, shifter = 0; x < 8; ++x, shifter += 2)
*frame++ = P[split + ((flags >> shifter) & 0x03)];
frame += s->width - 8;
}
}
}
return 0;
}
static int
ipvideo_decode_0xb (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int y;
/* 64-color encoding (each pixel in block is a different color) */
CHECK_STREAM (len, 64);
for (y = 0; y < 8; ++y) {
memcpy (frame, *data, 8);
frame += s->width;
(*data) += 8;
}
return 0;
}
static int
ipvideo_decode_0xc (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char pix;
/* 16-color block encoding: each 2x2 block is a different color */
CHECK_STREAM (len, 16);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2) {
pix = *(*data)++;
*(frame + x) = pix;
*(frame + x + 1) = pix;
*(frame + s->width + x) = pix;
*(frame + s->width + x + 1) = pix;
}
frame += s->width * 2;
}
return 0;
}
static int
ipvideo_decode_0xd (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char P[4];
unsigned char index = 0;
/* 4-color block encoding: each 4x4 block is a different color */
CHECK_STREAM (len, 4);
P[0] = (*data)[0];
P[1] = (*data)[1];
P[2] = (*data)[2];
P[3] = (*data)[3];
(*data) += 4;
for (y = 0; y < 8; ++y) {
if (y < 4)
index = 0;
else
index = 2;
for (x = 0; x < 8; ++x) {
if (x == 4)
++index;
*frame++ = P[index];
}
frame += s->width - 8;
}
return 0;
}
static int
ipvideo_decode_0xe (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int y;
unsigned char pix;
/* 1-color encoding: the whole block is 1 solid color */
CHECK_STREAM (len, 1);
pix = *(*data)++;
for (y = 0; y < 8; ++y) {
memset (frame, pix, 8);
frame += s->width;
}
return 0;
}
static int
ipvideo_decode_0xf (const GstMveDemuxStream * s, unsigned char *frame,
const unsigned char **data, unsigned short *len)
{
int x, y;
unsigned char P[2];
/* dithered encoding */
CHECK_STREAM (len, 2);
P[0] = *(*data)++;
P[1] = *(*data)++;
for (y = 0; y < 8; ++y) {
for (x = 0; x < 4; ++x) {
*frame++ = P[y & 1];
*frame++ = P[(y & 1) ^ 1];
}
frame += s->width - 8;
}
return 0;
}
int
ipvideo_decode_frame8 (const GstMveDemuxStream * s, const unsigned char *data,
unsigned short len)
{
int rc = 0;
int x, y, xx, yy;
int index = 0;
unsigned char opcode;
unsigned char *frame;
frame = s->back_buf1;
/* decoding is done in 8x8 blocks */
xx = s->width >> 3;
yy = s->height >> 3;
for (y = 0; y < yy; ++y) {
for (x = 0; x < xx; ++x) {
/* decoding map contains 4 bits of information per 8x8 block */
/* bottom nibble first, then top nibble */
if (index & 1)
opcode = s->code_map[index >> 1] >> 4;
else
opcode = s->code_map[index >> 1] & 0x0F;
++index;
/* GST_DEBUG ("block @ (%3d, %3d): encoding 0x%X, data ptr @ %p",
x, y, opcode, data); */
switch (opcode) {
case 0x00:
/* copy a block from the previous frame */
rc = ipvideo_copy_block (s, frame,
frame + (s->back_buf2 - s->back_buf1), 0);
break;
case 0x01:
/* copy block from 2 frames ago; since we switched the back
* buffers we don't actually have to do anything here */
break;
case 0x02:
rc = ipvideo_decode_0x2 (s, frame, &data, &len);
break;
case 0x03:
rc = ipvideo_decode_0x3 (s, frame, &data, &len);
break;
case 0x04:
rc = ipvideo_decode_0x4 (s, frame, &data, &len);
break;
case 0x05:
rc = ipvideo_decode_0x5 (s, frame, &data, &len);
break;
case 0x06:
/* mystery opcode? skip multiple blocks? */
GST_WARNING ("encountered unsupported opcode 0x6");
rc = -1;
break;
case 0x07:
rc = ipvideo_decode_0x7 (s, frame, &data, &len);
break;
case 0x08:
rc = ipvideo_decode_0x8 (s, frame, &data, &len);
break;
case 0x09:
rc = ipvideo_decode_0x9 (s, frame, &data, &len);
break;
case 0x0a:
rc = ipvideo_decode_0xa (s, frame, &data, &len);
break;
case 0x0b:
rc = ipvideo_decode_0xb (s, frame, &data, &len);
break;
case 0x0c:
rc = ipvideo_decode_0xc (s, frame, &data, &len);
break;
case 0x0d:
rc = ipvideo_decode_0xd (s, frame, &data, &len);
break;
case 0x0e:
rc = ipvideo_decode_0xe (s, frame, &data, &len);
break;
case 0x0f:
rc = ipvideo_decode_0xf (s, frame, &data, &len);
break;
}
if (rc != 0)
return rc;
frame += 8;
}
frame += 7 * s->width;
}
return 0;
}

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