Initial release

engine/tools/mp3-codec.cpp

@@ -0,0 +1,111 @@
+// mp3-codec.cpp: MP3 encoder/decoder CLI.
+//
+// Encode: mp3-codec -i input.wav -o output.mp3 [-b 128]
+// Decode: mp3-codec -i input.mp3 -o output.wav
+//
+// Direction is auto-detected from output extension.
+// Encoder: acestep mp3enc (MIT). Decoder: minimp3 (CC0).
+
+#include "audio-io.h"
+#include "version.h"
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+static bool ends_with(const char * str, const char * suffix) {
+    int slen = (int) strlen(str);
+    int xlen = (int) strlen(suffix);
+    if (slen < xlen) {
+        return false;
+    }
+    for (int i = 0; i < xlen; i++) {
+        char a = str[slen - xlen + i];
+        char b = suffix[i];
+        if (a >= 'A' && a <= 'Z') {
+            a += 32;
+        }
+        if (b >= 'A' && b <= 'Z') {
+            b += 32;
+        }
+        if (a != b) {
+            return false;
+        }
+    }
+    return true;
+}
+
+int main(int argc, char ** argv) {
+    if (argc < 5) {
+        fprintf(stderr, "acestep.cpp %s\n\n", ACE_VERSION);
+        fprintf(stderr,
+                "Usage: %s -i <input> -o <output> [options]\n"
+                "\n"
+                "  -i <path>     Input file (WAV or MP3)\n"
+                "  -o <path>     Output file (WAV or MP3)\n"
+                "  -b <kbps>     Bitrate for MP3 encoding (default: 128)\n"
+                "  --format <f>  WAV format: wav16, wav24, wav32 (default: wav16)\n"
+                "\n"
+                "Mode is auto-detected from output extension.\n"
+                "\n"
+                "Examples:\n"
+                "  %s -i song.wav -o song.mp3\n"
+                "  %s -i song.wav -o song.mp3 -b 192\n"
+                "  %s -i song.mp3 -o song.wav\n"
+                "  %s -i song.mp3 -o song.wav --format wav32\n",
+                argv[0], argv[0], argv[0], argv[0], argv[0]);
+        return 1;
+    }
+
+    const char * input   = NULL;
+    const char * output  = NULL;
+    int          bitrate = 128;
+    WavFormat    wav_fmt = WAV_S16;
+
+    for (int i = 1; i < argc; i++) {
+        if (strcmp(argv[i], "-i") == 0 && i + 1 < argc) {
+            input = argv[++i];
+        } else if (strcmp(argv[i], "-o") == 0 && i + 1 < argc) {
+            output = argv[++i];
+        } else if (strcmp(argv[i], "-b") == 0 && i + 1 < argc) {
+            bitrate = atoi(argv[++i]);
+        } else if (strcmp(argv[i], "--format") == 0 && i + 1 < argc) {
+            bool dummy_mp3;
+            if (!audio_parse_format(argv[++i], dummy_mp3, wav_fmt)) {
+                fprintf(stderr, "[MP3-Codec] Unknown format: %s\n", argv[i]);
+                return 1;
+            }
+        } else {
+            fprintf(stderr, "[MP3-Codec] Unknown option: %s\n", argv[i]);
+            return 1;
+        }
+    }
+
+    if (!input || !output) {
+        fprintf(stderr, "[MP3-Codec] Both -i and -o are required\n");
+        return 1;
+    }
+
+    // read input (WAV or MP3, auto-detected)
+    int     T = 0, sr = 0;
+    float * audio = audio_read(input, &T, &sr);
+    if (!audio) {
+        return 1;
+    }
+
+    // write output (WAV or MP3, auto-detected from extension)
+    bool ok;
+    if (ends_with(output, ".mp3")) {
+        ok = audio_write_mp3(output, audio, T, sr, bitrate);
+    } else if (ends_with(output, ".wav")) {
+        ok = audio_write_wav(output, audio, T, sr, wav_fmt);
+    } else {
+        fprintf(stderr, "[MP3-Codec] Cannot determine format from output extension\n");
+        fprintf(stderr, "  use .mp3 for encoding, .wav for decoding\n");
+        free(audio);
+        return 1;
+    }
+
+    free(audio);
+    return ok ? 0 : 1;
+}