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vendor libsmacker 1.2

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libsmacker is an open reimplementation of the parts of smackw32.dll needed
to get frames and audio out of an .smk file. Vendoring it here is the first
step to dropping the proprietary SMACKW32.LIB/SMACKW32.DLL dependency.

Nothing links against it yet.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Marco Antonio J. Costa
2026-07-23 19:01:37 -03:00
committed by majcosta
co-authored by Claude Opus 4.8
parent 9c1403b4ec
commit de78480c9c
12 changed files with 3131 additions and 4 deletions
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ext/libsmacker/CMakeLists.txt
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add_library(smacker STATIC "smacker.c")
target_include_directories(smacker PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
ext/libsmacker/COPYING
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That's all there is to it!
ext/libsmacker/INSTALL
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libsmacker
http://libsmacker.sourceforge.net
Compilation and Install Notes
---
There are two ways to compile libsmacker for use in your own programs.
1. DIRECT COMPILATION
This method is preferred when you can't (or don't want to) build a system
library. Simply take the various smk_* and smacker.* files, add them to your
project, and compile them in as usual.
All external functions (those you, a user, would care about) are contained in
smacker.h - so, in your main program, just
#include "smacker.h"
and you're ready to decode smk files.
To ease the process of managing libsmacker compilation, and to keep your source
tree uncluttered, you may wish to use libsmacker as a compiled static library
instead. This allows you to redistribute it, or compile once / separately from
your project, but with the advantage that linking against it does not create a
run-time dependency. See the next section.
2. LIBRARY COMPILATION
libsmacker is distributed as a standard autotools-based package. The build
requires a GNU- or BSD-compatible "make" program. Optionally, you may need
autotools development packages installed to regenerate some distribution
files if you wish to provide your own distribution.
From the root directory, run "./configure" - this will perform some checks on
your system to find the name of your C compiler, desired compilation flags,
etc. At the end of the configure process, there will be a generated Makefile.
Simply run "make" to build your files.
Compilation via autotools results in these files - though depending on your
system, compilation output may go into a .libs/ subfolder:
* libsmacker.a
* libsmacker.so (and several versioned symlinks)
* driver
* smk2avi
The "libsmacker.a" is a static library file which can be compiled in with an
existing codebase:
cc main.c extra.c libsmacker.a
or (better)
cc main.c -lsmacker
The "libsmacker.so" is a shared object file. Compiling with this means it
needs to be distributed along with your application; this might be useful to
save space if you have multiple programs that use libsmacker.
"driver" and "smk2avi" are example programs that show how to use libsmacker.
They can also test a successful build.
3. INSTALLATION
The makefile from "configure" can be used to install the .so and corresponding
.h file to correct locations - simply run "make install". This will copy the
files to $PREFIX and make them available system-wide to other developers or
applications.
4. CONTROLLING BUILD PARAMETERS
Altering build parameters is done by different flags to "configure". The
default is to build both a static AND shared library, as well as the two demo
programs. Also by default, CFLAGS is set to "-O2 -g". To change this, for
example making a debug build, use something like:
./configure CFLAGS="-O0"
or an optimized release build:
./configure CFLAGS="-march=i686 -O2 -DNDEBUG"
Once reconfigured, running "make" will apply CFLAGS to calls to the C compiler,
passing your options on to the underlying build system.
ext/libsmacker/Makefile.am
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ACLOCAL_AMFLAGS = -I m4
AM_CPPFLAGS = -Wall -Wextra
lib_LTLIBRARIES = libsmacker.la
libsmacker_la_SOURCES = smacker.c
libsmacker_la_LDFLAGS = -version-info 1:2:0
noinst_PROGRAMS = driver smk2avi
driver_SOURCES = driver.c
driver_LDADD = $(lib_LTLIBRARIES)
driver_DEPENDENCIES = $(lib_LTLIBRARIES)
smk2avi_SOURCES = smk2avi.c
smk2avi_LDADD = $(lib_LTLIBRARIES)
smk2avi_DEPENDENCIES = $(lib_LTLIBRARIES)
ext/libsmacker/README
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libsmacker
A C library for decoding .smk Smacker Video files
version 1.2.0
2021-06-02
(c) Greg Kennedy 2013-2021
http://libsmacker.sourceforge.net
----
---
Introduction
---
libsmacker is a cross-platform C library which can be used for decoding Smacker Video files produced by RAD Game Tools. Smacker Video was the king of video middleware in the 1990s, and its 256-color compressed video format was used in over 2600 software titles.
libsmacker implements the minimum feature set required from smackw32.dll to get an smk off a disk and the frames / audio into a buffer in the correct order.
---
License
---
libsmacker is released under the Lesser GNU Public License, v2.1. See the file COPYING for more information.
---
Usage
---
See the webpage for sample code and function documentation. The source package additionally includes a pair of driver programs:
* driver.c - dumps all frames of a file to a bmp/ subdirectory, and all audio as raw streams to out_*.raw files in CWD
* smk2avi.c - converts smk file(s) to AVI files - uncompressed 24-bit color and PCM audio stream.
Though the libraries are "bulletproofed" the sample apps are not: be cautious if you plan to implement in some critical environment.
---
Changelog
---
1.2.0
* Major refactor of data structures for performance
* Merge all files into a single unified .c source file
* Support audio-only .smk files
1.1.1
* Re-license under LGPL 2.1
1.1
* Switch to autotools-based build
* Incorporates patches from Dalerank Slim, Gennady Trafimenkov, and Bianca van Schaik
* Performance improvements and code cleanup / safety.
1.0
* Initial revision
---
Contact
---
Questions/comments:
* by email: kennedy.greg@gmail.com
* by website: http://libsmacker.sourceforge.net
Enjoy!
ext/libsmacker/configure.ac
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AC_INIT([libsmacker], [1.2.0], [kennedy.greg@gmail.com])
AC_CONFIG_MACRO_DIRS([m4])
AM_INIT_AUTOMAKE([foreign])
AC_PROG_CC
AC_HEADER_ASSERT
AC_PROG_LIBTOOL
AC_CONFIG_FILES([Makefile])
AC_OUTPUT
ext/libsmacker/driver.c
+170
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@@ -0,0 +1,170 @@
/*
* libsmacker - A C library for decoding .smk Smacker Video files Copyright
* (C) 2012-2013 Greg Kennedy
*
* See smacker.h for more information.
*
* driver.c Driver program
*/
#include "smacker.h"
#include <stdio.h>
void
dump_bmp(const unsigned char *pal, const unsigned char *image_data, unsigned int w, unsigned int h, unsigned int framenum)
{
int i;
FILE *fp;
char filename [128];
unsigned int temp;
sprintf(filename, "bmp/out_%04u.bmp", framenum);
fp = fopen(filename, "wb");
if (!fp) { fprintf(stderr, "Failed to open %s for write\n", filename); return; }
fwrite("BM", 2, 1, fp);
temp = 1078 + (w * h);
fwrite(&temp, 4, 1, fp);
temp = 0;
fwrite(&temp, 4, 1, fp);
temp = 1078;
fwrite(&temp, 4, 1, fp);
temp = 40;
fwrite(&temp, 4, 1, fp);
fwrite(&w, 4, 1, fp);
fwrite(&h, 4, 1, fp);
temp = 1;
fwrite(&temp, 2, 1, fp);
temp = 8;
fwrite(&temp, 4, 1, fp);
temp = 0;
fwrite(&temp, 2, 1, fp);
temp = w * h;
fwrite(&temp, 4, 1, fp);
temp = 0;
fwrite(&temp, 4, 1, fp);
fwrite(&temp, 4, 1, fp);
temp = 256;
fwrite(&temp, 4, 1, fp);
temp = 256;
fwrite(&temp, 4, 1, fp);
temp = 0;
for (i = 0; i < 256; i++)
{
fwrite(&pal[(i * 3) + 2], 1, 1, fp);
fwrite(&pal[(i * 3) + 1], 1, 1, fp);
fwrite(&pal[(i * 3)], 1, 1, fp);
fwrite(&temp, 1, 1, fp);
}
for (i = h - 1; i >= 0; i--)
{
fwrite(&image_data[i * w], w, 1, fp);
}
fclose(fp);
}
int
main(int argc, char *argv[])
{
unsigned long w, h, f;
double usf;
smk s;
char filename [128];
FILE *fpo[7] = {NULL};
if (argc != 2)
{
printf("Usage: %s file.smk\n", argv[0]);
return -1;
}
/* s = smk_open(argv[1], SMK_MODE_DISK); */
s = smk_open_file(argv[1], SMK_MODE_MEMORY);
if (s == NULL)
{
printf("Errors encountered opening %s, exiting.\n", argv[1]);
return -1;
}
/* print some info about the file */
smk_info_all(s, NULL, &f, &usf);
smk_info_video(s, &w, &h, NULL);
printf("Opened file %s\nWidth: %lu\nHeight: %lu\nFrames: %lu\nFPS: %f\n", argv[1], w, h, f, 1000000.0 / usf);
unsigned char a_t, a_c[7], a_d[7];
unsigned long a_r[7];
smk_info_audio(s, &a_t, a_c, a_d, a_r);
int i;
for (i = 0; i < 7; i++)
{
printf("Audio track %d: %u bits, %u channels, %luhz\n", i, a_d[i], a_c[i], a_r[i]);
}
/* Turn on decoding for palette, video, and audio track 0 */
smk_enable_video(s, 1);
for (i = 0; i < 7; i++)
{
if (a_t & (1 << i))
{
smk_enable_audio(s, i, 1);
sprintf(filename, "out_%01d.raw", i);
fpo[i] = fopen(filename, "wb");
} else
{
fpo[i] = NULL;
}
}
//Get a pointer to first frame
smk_first(s);
unsigned long cur_frame;
smk_info_all(s, &cur_frame, NULL, NULL);
dump_bmp(smk_get_palette(s), smk_get_video(s), w, h, cur_frame);
for (i = 0; i < 7; i++)
{
if (fpo[i] != NULL)
{
fwrite(smk_get_audio(s, i), smk_get_audio_size(s, i), 1, fpo[i]);
}
}
printf(" -> Frame %lu\n", cur_frame);
for (cur_frame = 1; cur_frame < f; cur_frame ++)
{
smk_next(s);
/* smk_info_all(s, &cur_frame, NULL, NULL); */
dump_bmp(smk_get_palette(s), smk_get_video(s), w, h, cur_frame);
for (i = 0; i < 7; i++)
{
if (fpo[i] != NULL)
{
fwrite(smk_get_audio(s, i), smk_get_audio_size(s, i), 1, fpo[i]);
}
}
fprintf(stderr," -> Frame %lu\n", cur_frame);
//Advance to next frame
}
for (i = 0; i < 7; i++)
if (fpo[i] != NULL)
{
fclose(fpo[i]);
}
smk_close(s);
return 0;
}
ext/libsmacker/smacker.c
+1797
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ext/libsmacker/smacker.h
+103
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/**
libsmacker - A C library for decoding .smk Smacker Video files
Copyright (C) 2012-2020 Greg Kennedy
libsmacker is a cross-platform C library which can be used for
decoding Smacker Video files produced by RAD Game Tools.
This program 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 2.1 of the License, or
(at your option) any later version.
This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SMACKER_H
#define SMACKER_H
/* includes - needed for FILE* here */
#include <stdio.h>
/** forward-declaration for an struct */
typedef struct smk_t * smk;
/** a few defines as return codes from smk_next() */
#define SMK_DONE 0x00
#define SMK_MORE 0x01
#define SMK_LAST 0x02
#define SMK_ERROR -1
/** file-processing mode, pass to smk_open_file */
#define SMK_MODE_DISK 0x00
#define SMK_MODE_MEMORY 0x01
/** Y-scale meanings */
#define SMK_FLAG_Y_NONE 0x00
#define SMK_FLAG_Y_INTERLACE 0x01
#define SMK_FLAG_Y_DOUBLE 0x02
/** track mask and enable bits */
#define SMK_AUDIO_TRACK_0 0x01
#define SMK_AUDIO_TRACK_1 0x02
#define SMK_AUDIO_TRACK_2 0x04
#define SMK_AUDIO_TRACK_3 0x08
#define SMK_AUDIO_TRACK_4 0x10
#define SMK_AUDIO_TRACK_5 0x20
#define SMK_AUDIO_TRACK_6 0x40
#define SMK_VIDEO_TRACK 0x80
/* PUBLIC FUNCTIONS */
#ifdef __cplusplus
extern "C" {
#endif
/* OPEN OPERATIONS */
/** open an smk (from a file) */
smk smk_open_file(const char * filename, unsigned char mode);
/** open an smk (from a file pointer) */
smk smk_open_filepointer(FILE * file, unsigned char mode);
/** read an smk (from a memory buffer) */
smk smk_open_memory(const unsigned char * buffer, unsigned long size);
/* CLOSE OPERATIONS */
/** close out an smk file and clean up memory */
void smk_close(smk object);
/* GET FILE INFO OPERATIONS */
char smk_info_all(const smk object, unsigned long * frame, unsigned long * frame_count, double * usf);
char smk_info_video(const smk object, unsigned long * w, unsigned long * h, unsigned char * y_scale_mode);
char smk_info_audio(const smk object, unsigned char * track_mask, unsigned char channels[7], unsigned char bitdepth[7], unsigned long audio_rate[7]);
/* ENABLE/DISABLE Switches */
char smk_enable_all(smk object, unsigned char mask);
char smk_enable_video(smk object, unsigned char enable);
char smk_enable_audio(smk object, unsigned char track, unsigned char enable);
/** Retrieve palette */
const unsigned char * smk_get_palette(const smk object);
/** Retrieve video frame, as a buffer of size w*h */
const unsigned char * smk_get_video(const smk object);
/** Retrieve decoded audio chunk, track N */
const unsigned char * smk_get_audio(const smk object, unsigned char track);
/** Get size of currently pointed decoded audio chunk, track N */
unsigned long smk_get_audio_size(const smk object, unsigned char track);
/** rewind to first frame and unpack */
char smk_first(smk object);
/** advance to next frame and unpack */
char smk_next(smk object);
/** seek to first keyframe before/at N in an smk */
char smk_seek_keyframe(smk object, unsigned long frame);
#ifdef __cplusplus
}
#endif
#endif
ext/libsmacker/smk2avi.c
+327
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@@ -0,0 +1,327 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "smacker.h"
#define w(p,n) fwrite(p,1,n,fp)
#define LIST w("LIST",4);
#define lu(p) \
{ \
b[0] = (p & 0x000000FF); \
b[1] = ((p & 0x0000FF00) >> 8); \
b[2] = ((p & 0x00FF0000) >> 16); \
b[3] = ((p & 0xFF000000) >> 24); \
w(b,4); \
}
#define su(p) \
{ \
b[0] = (p & 0x00FF); \
b[1] = ((p & 0xFF00) >> 8); \
w(b,2); \
}
void process(const char *fn)
{
FILE *fp = NULL;
smk s;
char outfile[256];
unsigned char b[5];
unsigned int i,k;
int j;
unsigned long temp_u;
/* all and video info */
unsigned long w, h, f;
double usf;
unsigned long total_frame_size;
/* audio info */
unsigned char a_t, a_c[7], a_d[7];
unsigned long a_r[7];
unsigned char num_tracks = 0;
unsigned char **audio_data[7];
unsigned long *audio_size[7];
unsigned long total_audio_size[7] = {0};
unsigned long total_total_audio_size = 0;
const unsigned char *pal,*frame;
unsigned long cur_frame;
printf("--------\nsmk2avi processing %s...\n",fn);
/* open the smk file */
s = smk_open_file(fn,SMK_MODE_DISK);
if (s == NULL) goto error;
/* get some info about the file */
smk_info_all(s, NULL, &f, &usf);
smk_info_video(s, &w, &h, NULL);
smk_info_audio(s, &a_t, a_c, a_d, a_r);
printf("\t\t\twidth: %lu, height: %lu, usec/frame: %lf, frames: %lu\n",w,h,usf,f);
total_frame_size = w * h * 3;
/* make 2 passes through the file.
first one is to pull all the audio tracks only. */
smk_enable_all(s,a_t);
for (i = 0; i < 7; i ++)
{
if (a_t & (1 << i))
{
audio_size[i] = malloc(f * sizeof(unsigned long));
audio_data[i] = malloc(f * sizeof(unsigned char*));
num_tracks ++;
} else {
audio_size[i] = NULL;
audio_data[i] = NULL;
}
}
printf("\tAudio processing frame: ");
smk_first(s);
for (cur_frame = 0; cur_frame < f; cur_frame ++)
{
printf("%lu... ",cur_frame);
fflush(stdout);
for (i = 0; i < 7; i ++)
{
if (audio_size[i] != NULL)
{
audio_size[i][cur_frame] = smk_get_audio_size(s,i);
total_audio_size[i] += smk_get_audio_size(s,i);
total_total_audio_size += smk_get_audio_size(s,i);
audio_data[i][cur_frame] = malloc(audio_size[i][cur_frame]);
memcpy(audio_data[i][cur_frame],smk_get_audio(s,i),audio_size[i][cur_frame]);
}
}
smk_next(s);
}
printf("done!\n");
smk_enable_all(s,SMK_VIDEO_TRACK);
sprintf(outfile,"%s.avi",fn);
fp = fopen(outfile,"wb");
printf("Writing AVI file...\n");
// riff header
w("RIFF",4);
temp_u = 4 + 4 + (8 + 64 + 124 + (num_tracks * 102)) +
8 + (4 + ((total_frame_size + 8) * f) + ( (num_tracks * 8) + total_total_audio_size));
lu(temp_u);
w("AVI ",4);
{
// avi header list
LIST;
temp_u = 8 + 64 + 124 + (num_tracks * 102);
lu(temp_u);
w("hdrl",4);
{
// avi header
w("avih",4);
lu(56);
{
lu( (unsigned long)usf ); // microsec per frame
temp_u = total_frame_size + total_total_audio_size;
lu( temp_u ); // max bytes per sec
lu( 1 ); // padding granularity
lu( 0 ); // flags
lu( f ); // total frames
lu( 0 ); // initial frames
temp_u = num_tracks + 1;
lu( temp_u ); // streams
temp_u = total_frame_size + total_total_audio_size;
lu( temp_u ); // suggested buf size
lu( w ); // width
lu( h ); // height
lu( 0 ); // reserved (0-3)
lu( 0 );
lu( 0 );
lu( 0 );
}
// stream list: video stream
puts("Video stream header list");
LIST
lu(116);
w("strl",4);
{
w("strh",4);
lu(56);
{
w("vids",4); // fourcc type
w("DIB ",4); // fourcc handler
lu(0); // flags
lu(0); // priority + language
lu(0); // init frames
lu ((unsigned long)usf); // scale
lu( 1000000 ); // rate
lu(0); // start
temp_u = (unsigned long) ((double)f * 100000.0 / usf);
lu( temp_u ); // length (time in seconds ?)
lu(total_frame_size); // suggested bufsize
lu(-1); // quality
lu(total_frame_size); // samplesize
lu(0); // rcFrame
su(w); su(h); // rcFrame: right, bottom
}
w("strf",4);
lu(40);
{
lu(40); // size
lu(w); // width
lu(h); // height
su(1); // planes
su(24); // bpp
lu(0); // compression
lu(total_frame_size); // total image frame size
lu(0); // xpels/meter
lu(0); // ypels/meter
lu(0); // colors used
lu(0); // colors important
}
}
// stream list: audio stream(s)
for (i = 0; i < 7; i++)
{
if (audio_size[i] != NULL)
{
printf("-> Audio header %d, %luhz, %d bits, %d channels\n",i,a_r[i],a_d[i],a_c[i]);
LIST
lu(94);
w("strl",4);
w("strh",4);
lu(56);
{
w("auds",4); // fourcc
lu(0); // handler (pcm)
lu(0); // flags
lu(0); // priority + language
lu(0); // initial frames
lu( a_c[i]); // scale
temp_u = a_r[i] * a_c[i];
lu( temp_u ); // framerate
lu(0); // start
temp_u = (unsigned long) ((double)f * 100000.0 / usf);
lu( temp_u ); // time in seconds
temp_u = total_audio_size[i] / a_c[i];
lu( temp_u ); // sugg. buf size
lu(-1); // quality
temp_u = total_audio_size[i];
lu(temp_u); // sample size
lu(0); // rect ??
lu(0); // rect ??
}
w("strf",4);
lu(18);
{
su(1); // format
su(a_c[i]); // channels
lu(a_r[i]); // samples/sec
temp_u = a_c[i] * a_r[i] * (a_d[i] / 8); // avg bytes/sec
lu(temp_u);
temp_u = a_c[i] * (a_d[i] / 8); // avg bytes/sec
su(temp_u);
su(a_d[i]);
su(0);
}
}
}
}
smk_first(s);
printf("\tVideo processing frame:\n");
// movie data
LIST
temp_u = 4 + ((total_frame_size + 8) * f) + ( (num_tracks * 8) + total_total_audio_size);
lu(temp_u);
w("movi",4);
for (i = 0; i < f; i ++)
{
w("00db",4);
lu(total_frame_size);
frame = smk_get_video(s);
pal = smk_get_palette(s);
if (frame == NULL || pal == NULL) goto error;
for (j = h - 1; j >= 0; j--)
{
for (k = 0; k < w; k++)
{
w(&pal[frame[(j * w) + k] * 3 + 2],1);
w(&pal[frame[(j * w) + k] * 3 + 1],1);
w(&pal[frame[(j * w) + k] * 3],1);
}
}
printf("%u...",i);
fflush(stdout);
smk_next(s);
}
printf("done!\n");
k = 0;
for (i = 0; i < 7; i++)
{
if (audio_size[i] != NULL)
{
k ++;
sprintf((char *)b,"%02uwb",k);
w(b,4);
temp_u = total_audio_size[i];
lu(temp_u);
for (j = 0; j < (int)f; j++)
{
w(audio_data[i][j],audio_size[i][j]);
}
}
}
}
fclose(fp);
smk_close(s);
printf("done.\n--------\n");
return;
error:
if (fp) fclose(fp);
smk_close(s);
printf("!!HAD ERRORS!!\n--------\n");
return;
}
int main (int argc, char *argv[])
{
int i;
for (i = 1; i < argc; i ++)
{
process(argv[i]);
}
return 0;
}
ext/libsmacker/smk_malloc.h
+56
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@@ -0,0 +1,56 @@
/**
libsmacker - A C library for decoding .smk Smacker Video files
Copyright (C) 2012-2017 Greg Kennedy
See smacker.h for more information.
smk_malloc.h
"Safe" implementations of malloc and free.
Verbose implementation of assert.
*/
#ifndef SMK_MALLOC_H
#define SMK_MALLOC_H
/* assert */
#include <assert.h>
/* calloc */
#include <stdlib.h>
/* fprintf */
#include <stdio.h>
/* Error messages from calloc */
#include <errno.h>
#include <string.h>
/**
Safe free: attempts to prevent double-free by setting pointer to NULL.
Optionally warns on attempts to free a NULL pointer.
*/
#define smk_free(p) \
{ \
assert (p); \
free(p); \
p = NULL; \
}
/**
Safe malloc: exits if calloc() returns NULL.
Also initializes blocks to 0.
Optionally warns on attempts to malloc over an existing pointer.
Ideally, one should not exit() in a library. However, if you cannot
calloc(), you probably have bigger problems.
*/
#define smk_malloc(p, x) \
{ \
assert (p == NULL); \
p = calloc(1, x); \
if (!p) \
{ \
fprintf(stderr, "libsmacker::smk_malloc(" #p ", %lu) - ERROR: calloc() returned NULL (file: %s, line: %lu)\n\tReason: [%d] %s\n", \
(unsigned long) (x), __FILE__, (unsigned long)__LINE__, errno, strerror(errno)); \
exit(EXIT_FAILURE); \
} \
}
#endif
ext/versions.txt
+5 -4
View File
@@ -1,4 +1,5 @@
7z(lzma) : 9.22
utfcpp : 2.3.4
libpng : 1.2.50
zlib : 1.2.8
7z(lzma) : 9.22
utfcpp : 2.3.4
libpng : 1.2.50
libsmacker : 1.2.0
zlib : 1.2.8