feat:mp3 (#3)

---------

Co-authored-by: intelligence <intelligence@debian.local>
Reviewed-on: #3

third_party/transui_mp3/transui_mp3.h

@@ -0,0 +1,29 @@
+#ifndef TRANSUI_MP3_H
+#define TRANSUI_MP3_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum {
+  TRANSUI_MP3_OK = 0,
+  TRANSUI_MP3_INVALID_INPUT = 1,
+  TRANSUI_MP3_ENCODER_ERROR = 2,
+  TRANSUI_MP3_OUT_OF_MEMORY = 3,
+};
+
+int transui_mp3_encode_mono_16k_32kbps(const uint8_t *pcm_le,
+                                       size_t pcm_byte_count,
+                                       uint8_t **output,
+                                       size_t *output_size);
+
+void transui_mp3_free(void *memory);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif