ffmpeg in windows

examples/compat_win.h

@@ -0,0 +1,122 @@
+#pragma once
+
+#ifdef _WIN32
+
+// ----------------------------------------------------
+// Windows compatibility layer for POSIX-style functions
+// ----------------------------------------------------
+
+// Suppress CRT security warnings for _open/_read/_write etc.
+#define _CRT_SECURE_NO_WARNINGS
+
+#include <io.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <windows.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+// ----------------------------------------------------
+// GCC/Clang attribute compatibility
+// ----------------------------------------------------
+
+// Make GCC-style __attribute__((...)) a no-op on MSVC
+#ifndef __attribute__
+#define __attribute__(x)
+#endif
+
+// Handle '__packed__' keyword used in Linux/GCC code
+#ifndef __packed__
+#define __packed__
+#endif
+
+// ----------------------------------------------------
+// POSIX I/O compatibility
+// ----------------------------------------------------
+#define open  _open
+#define read  _read
+#define write _write
+#define close _close
+#define lseek _lseek
+#define stat  _stat64i32
+#define fstat _fstat64i32
+
+// Common file flags mapping
+#ifndef O_RDONLY
+#define O_RDONLY _O_RDONLY
+#endif
+#ifndef O_WRONLY
+#define O_WRONLY _O_WRONLY
+#endif
+#ifndef O_RDWR
+#define O_RDWR _O_RDWR
+#endif
+#ifndef O_CREAT
+#define O_CREAT _O_CREAT
+#endif
+#ifndef O_TRUNC
+#define O_TRUNC _O_TRUNC
+#endif
+
+// ----------------------------------------------------
+// Memory mapping stubs (mmap, munmap, etc.)
+// ----------------------------------------------------
+// These emulate minimal mmap behavior using Win32 APIs
+// to allow code that expects mmap() to compile and run
+// (but with real file I/O behind the scenes).
+// ----------------------------------------------------
+
+#define PROT_READ  1
+#define PROT_WRITE 2
+#define MAP_PRIVATE 2
+#define MAP_FAILED ((void *)-1)
+
+static inline void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) {
+    HANDLE hMap = CreateFileMappingA(
+        (HANDLE)_get_osfhandle(fd),
+        NULL,
+        PAGE_READWRITE,
+        0,
+        (DWORD)length,
+        NULL
+    );
+    if (!hMap) {
+        fprintf(stderr, "CreateFileMappingA failed: %lu\n", GetLastError());
+        return MAP_FAILED;
+    }
+
+    void *map = MapViewOfFile(
+        hMap,
+        FILE_MAP_READ | FILE_MAP_WRITE,
+        0,
+        offset,
+        length
+    );
+
+    CloseHandle(hMap);
+
+    if (!map) {
+        fprintf(stderr, "MapViewOfFile failed: %lu\n", GetLastError());
+        return MAP_FAILED;
+    }
+
+    return map;
+}
+
+static inline int munmap(void *addr, size_t length) {
+    if (!UnmapViewOfFile(addr)) {
+        fprintf(stderr, "UnmapViewOfFile failed: %lu\n", GetLastError());
+        return -1;
+    }
+    return 0;
+}
+
+// ----------------------------------------------------
+// POSIX type aliases and missing symbols
+// ----------------------------------------------------
+typedef int mode_t;
+typedef intptr_t ssize_t;
+
+#endif // _WIN32

examples/ffmpeg-transcode.cpp

@@ -7,6 +7,8 @@
  * Copyright (C) 2024       William Tambellini <william.tambellini@gmail.com>
  */
 
+#include "compat_win.h"
+
 // Just for conveninent C++ API
 #include <vector>
 #include <string>
@@ -20,8 +22,6 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <unistd.h>
-#include <sys/mman.h>
 
 extern "C" {
 #include <libavutil/opt.h>
@@ -325,19 +325,19 @@ static int decode_audio(struct audio_buffer *audio_buf, s16 **data, int *size)
 // ifname: input file path
 // owav_data: in mem wav file. Can be forwarded as it to whisper/drwav
 // return 0 on success
-int ffmpeg_decode_audio(const std::string &ifname, std::vector<uint8_t>& owav_data) {
+bool ffmpeg_decode_audio(const std::string &ifname, std::vector<uint8_t>& owav_data) {
     LOG("ffmpeg_decode_audio: %s\n", ifname.c_str());
     int ifd = open(ifname.c_str(), O_RDONLY);
     if (ifd == -1) {
         fprintf(stderr, "Couldn't open input file %s\n", ifname.c_str());
-        return -1;
+        return false;
     }
     u8 *ibuf = NULL;
     size_t ibuf_size;
     int err = map_file(ifd, &ibuf, &ibuf_size);
     if (err) {
         LOG("Couldn't map input file %s\n", ifname.c_str());
-        return err;
+        return false;
     }
     LOG("Mapped input file: %s size: %d\n", ibuf, (int) ibuf_size);
     struct audio_buffer inaudio_buf;
@@ -351,7 +351,7 @@ int ffmpeg_decode_audio(const std::string &ifname, std::vector<uint8_t>& owav_da
     LOG("decode_audio returned %d \n", err);
     if (err != 0) {
         LOG("decode_audio failed\n");
-        return err;
+        return false;
     }
     LOG("decode_audio output size: %d\n", osize);
 
@@ -364,5 +364,5 @@ int ffmpeg_decode_audio(const std::string &ifname, std::vector<uint8_t>& owav_da
     // the data:
     memcpy(owav_data.data() + sizeof(wave_hdr), odata, osize* sizeof(s16));
 
-    return 0;
+    return true;
 }