Fix MSVC build

README.md

@@ -70,11 +70,10 @@ aptdec-cli -i lut -l luts/WXtoImg-N18-HVC.png gqrx_20200527_115730_137914960.wav
 ### Arguments
 
 ```
--h, --help                show a help message and exit
--i, --image=<str>         set output image type (see below)
--e, --effect=<str>        add an effect (see below)
--g, --gamma=<flt>         gamma adjustment (1.0 = off)
--s, --satellite=<int>     satellite ID, must be between 15, 18 or 19 or NORAD
+-h, --help                show this help message and exit
+-i, --image=<str>         set output image type (see the README for a list)
+-e, --effect=<str>        add an effect (see the README for a list)
+-s, --satellite=<int>     satellite ID, must be either NORAD or 15/18/19
 -l, --lut=<str>           path to a LUT
 -o, --output=<str>        path of output image
 -r, --realtime            decode in realtime
@@ -129,7 +128,7 @@ sudo apt install wget cmake make mingw-w64 git unzip
 
 To build natively on Windows using MSVC, you will need: git, ninja and cmake. Then run:
 ```
-.\build_windows.bat
+./build_windows.bat
 ```
 
 If you only want to build libaptdec, libpng and libsndfile aren't needed.

aptdec-cli/main.c

@@ -110,7 +110,7 @@ int main(int argc, const char **argv) {
         OPT_STRING('i', "image", &opts.type, "set output image type (see the README for a list)", NULL, 0, 0),
         OPT_STRING('e', "effect", &opts.effects, "add an effect (see the README for a list)", NULL, 0, 0),
         OPT_GROUP("Satellite options"),
-        OPT_INTEGER('s', "satellite", &opts.satellite, "satellite ID, must be either NORAD or between 15 and 19", NULL, 0, 0),
+        OPT_INTEGER('s', "satellite", &opts.satellite, "satellite ID, must be either NORAD or 15/18/19", NULL, 0, 0),
         OPT_GROUP("Paths"),
         OPT_STRING('l', "lut", &opts.lut, "path to a LUT", NULL, 0, 0),
         OPT_STRING('o', "output", &opts.filename, "path of output image", NULL, 0, 0),
@@ -454,7 +454,7 @@ static size_t callback(float *samples, size_t count, void *context) {
         case 1:
             return sf_read_float(file->file, samples, count);
         case 2: {
-            float _samples[count * 2];
+            float _samples[APTDEC_BUFFER_SIZE * 2];
             size_t read = sf_read_float(file->file, _samples, count * 2);
 
             for (size_t i = 0; i < count; i++) {

aptdec-cli/util.h

@@ -22,7 +22,11 @@
 #include <stddef.h>
 
 void error_noexit(const char *text);
+#ifdef _MSC_VER
+void error(const char *text);
+#else
 __attribute__((noreturn)) void error(const char *text);
+#endif
 void warning(const char *text);
 
 int clamp_int(int x, int lo, int hi);

build_windows.bat

@@ -1,36 +1,36 @@
-REM Build using Visual Studio 2019 on Windows
-REM Additional tools needed: git, cmake and ninja
+REM Build using MSVC on Windows
+REM Requires: git, cmake and ninja
 
 REM Build zlib
-git clone -b v1.2.13 https://github.com/madler/zlib
-cd zlib
-mkdir build
-cd build
-cmake -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../../winpath ..
-ninja install
-cd ../../
+IF NOT EXIST zlib (
+    git clone -b v1.2.13 https://github.com/madler/zlib
+    cd zlib
+    cmake -B build -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../winpath
+    cmake --build build -j4
+    cmake --build build --target install
+    cd ..
+)
 
 REM Build libpng
-git clone -b v1.6.39 https://github.com/glennrp/libpng
-cd libpng
-mkdir build
-cd build
-cmake -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../../winpath ..
-ninja install
-cd ../..
+IF NOT EXIST libpng (
+    git clone -b v1.6.39 https://github.com/glennrp/libpng
+    cd libpng
+    cmake -B build -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../winpath -DPNG_STATIC=OFF -DPNG_EXECUTABLES=OFF -DPNG_TESTS=OFF
+    cmake --build build -j4
+    cmake --build build --target install
+    cd ..
+)
 
-REM Build libsndfile - Could build Vorbis, FLAC and Opus first for extra support
-git clone -b 1.1.0 https://github.com/libsndfile/libsndfile
-cd libsndfile
-mkdir build
-cd build
-cmake -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../../winpath ..
-ninja install
-cd ../..
+REM Build libsndfile, only with WAV support
+IF NOT EXIST libsndfile (
+    git clone -b 1.2.0 https://github.com/libsndfile/libsndfile
+    cd libsndfile
+    cmake -B build -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../winpath -BUILD_SHARED_LIBS=ON -DBUILD_EXAMPLES=OFF -DBUILD_PROGRAMS=OFF
+    cmake --build build -j4
+    cmake --build build --target install
+    cd ..
+)
 
 REM Build aptdec
-mkdir winbuild
-cd winbuild
-cmake -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../winpath ..
-ninja install
-cd ..
+cmake -B winbuild -G Ninja -DCMAKE_C_COMPILER="cl.exe" -DMSVC_TOOLSET_VERSION=190 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../winpath
+cmake --build winbuil -j4

build_windows.sh

@@ -17,7 +17,7 @@ fi
 # Build libpng from source
 if [ ! -d "libpng" ]; then
     git clone --depth 1 -b v1.6.39 https://github.com/glennrp/libpng && cd libpng
-    cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchain-mingw32.cmake -DCMAKE_INSTALL_PREFIX=$TEMP_PATH
+    cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchain-mingw32.cmake -DCMAKE_INSTALL_PREFIX=$TEMP_PATH -DPNG_STATIC=OFF -DPNG_EXECUTABLES=OFF -DPNG_TESTS=OFF
     cmake --build build -j$(nproc)
     cmake --build build --target install
     cd ..

libaptdec/dsp.c

@@ -27,7 +27,6 @@
 #include "util.h"
 #include "algebra.h"
 
-#define BUFFER_SIZE 16384
 #define LOW_PASS_SIZE 101
 
 #define CARRIER_FREQ 2400.0f
@@ -113,7 +112,7 @@ aptdec_t *aptdec_init(float sample_rate) {
     }
 
     // Hilbert transform
-    apt->hilbert = fir_init(BUFFER_SIZE, 31);
+    apt->hilbert = fir_init(APTDEC_BUFFER_SIZE, 31);
     if (apt->hilbert == NULL) {
         free(apt->pll);
         free(apt);
@@ -163,18 +162,18 @@ static int am_demod(aptdec_t *apt, float *out, size_t count, aptdec_callback_t c
 }
 
 static int get_pixels(aptdec_t *apt, float *out, size_t count, aptdec_callback_t callback, void *context) {
-    static float buffer[BUFFER_SIZE];
-    static size_t n = BUFFER_SIZE;
+    static float buffer[APTDEC_BUFFER_SIZE];
+    static size_t n = APTDEC_BUFFER_SIZE;
     static float offset = 0.0;
 
     float ratio = apt->sample_rate / (4160.0f * apt->sync_frequency);
 
     for (size_t i = 0; i < count; i++) {
         // Get more samples if there are less than `LOW_PASS_SIZE` available
-        if (n + LOW_PASS_SIZE > BUFFER_SIZE) {
-            memcpy(buffer, &buffer[n], (BUFFER_SIZE-n) * sizeof(float));
+        if (n + LOW_PASS_SIZE > APTDEC_BUFFER_SIZE) {
+            memcpy(buffer, &buffer[n], (APTDEC_BUFFER_SIZE-n) * sizeof(float));
 
-            size_t read = am_demod(apt, &buffer[BUFFER_SIZE-n], n, callback, context);
+            size_t read = am_demod(apt, &buffer[APTDEC_BUFFER_SIZE-n], n, callback, context);
             if (read != n) {
                 return i;
             }

libaptdec/effects.c

@@ -138,7 +138,7 @@ int apt_crop(apt_image_t *img) {
     const float sync_pattern[] = {-1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1,  1,  -1, -1, 1,  1,  -1, -1,
                                   1,  1,  -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 0};
 
-    float spc_rows[img->rows];
+    float *spc_rows = (float *)malloc(img->rows * sizeof(float));
     int startCrop = 0;
     int endCrop = img->rows;
 
@@ -171,5 +171,6 @@ int apt_crop(apt_image_t *img) {
     // Remove the noisy rows at start
     memmove(img->data, &img->data[startCrop * APT_IMG_WIDTH], img->rows * APT_IMG_WIDTH * sizeof(float));
 
+    free(spc_rows);
     return startCrop;
 }

libaptdec/filter.c

@@ -98,7 +98,11 @@ complexf_t hilbert_transform(const float *in, const float *taps, size_t len) {
 }
 
 float interpolating_convolve(const float *in, const float *taps, size_t len, float offset) {
+#ifdef _MSC_VER
+    float *_taps = (float *)_alloca(len * sizeof(float));
+#else
     float _taps[len];
+#endif
 
     for (size_t i = 0; i < len; i++) {
         float next = (i == len-1) ? 0.0f : taps[i+1];

libaptdec/image.c

@@ -38,7 +38,7 @@ apt_image_t apt_image_clone(apt_image_t img) {
 
 static void decode_telemetry(const float *data, size_t rows, size_t offset, float *wedges) {
     // Calculate row average
-    float telemetry_rows[rows];
+    float *telemetry_rows = (float *)malloc(rows * sizeof(float));
     for (size_t y = 0; y < rows; y++) {
         telemetry_rows[y] = meanf(&data[y*APT_IMG_WIDTH + offset + APT_CH_WIDTH], APT_TELEMETRY_WIDTH);
     }
@@ -74,10 +74,12 @@ static void decode_telemetry(const float *data, size_t rows, size_t offset, floa
     for (size_t i = 0; i < APT_FRAME_WEDGES; i++) {
         wedges[i] = meanf(&telemetry_rows[best_frame + i*APT_WEDGE_HEIGHT], APT_WEDGE_HEIGHT);
     }
+
+    free(telemetry_rows);
 }
 
 static float average_spc(apt_image_t *img, size_t offset) {
-    float rows[img->rows];
+    float *rows = (float *)malloc(img->rows * sizeof(float));
     float average = 0.0f;
     for (size_t y = 0; y < img->rows; y++) {
         float row_average = 0.0f;
@@ -100,6 +102,7 @@ static float average_spc(apt_image_t *img, size_t offset) {
         }
     }
 
+    free(rows);
     return weighted_average / (float)n;
 }
 

libaptdec/include/aptdec.h

@@ -64,6 +64,8 @@ extern "C" {
 
 // Number of rows needed for apt_normalize to (reliably) work
 #define APTDEC_NORMALIZE_ROWS (APT_FRAME_LEN * 2)
+// Maximum amount of samples that will be requested from aptdec_callback_t
+#define APTDEC_BUFFER_SIZE 16384
 
 // Channel 1:  visible (0.58-0.68 um)
 // Channel 2:  near-IR (0.725-1.0 um)
@@ -115,7 +117,7 @@ typedef size_t (*aptdec_callback_t)(float *samples, size_t count, void *context)
 
 // Clone an apt_image_t struct
 // Useful for calibration
-apt_image_t apt_image_clone(apt_image_t img);
+APTDEC_API apt_image_t apt_image_clone(apt_image_t img);
 
 // Returns version of libaptdec in git tag format
 // i.e. v2.0.0 or v2.0.0-1-xxxxxx
@@ -159,8 +161,8 @@ static const apt_region_t APT_REGION_CHA_FULL = { 0,               APT_IMG_WIDTH
 static const apt_region_t APT_REGION_CHB_FULL = { APT_IMG_WIDTH/2, APT_IMG_WIDTH/2 };
 static const apt_region_t APT_REGION_FULL     = { 0,               APT_IMG_WIDTH };
 
-extern const uint32_t temperature_gradient[256];
-extern const uint32_t precipitation_gradient[58];
+APTDEC_API extern const uint32_t temperature_gradient[256];
+APTDEC_API extern const uint32_t precipitation_gradient[58];
 
 #ifdef __cplusplus
 }