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examples/whisper/cpp/src/pre_process_whisper.cpp

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+/*
+ * Copyright (C) 2024–2025 Amlogic, Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+#include "pre_process_whisper.h"
+#include "pre_post_common.h"
+
+extern bool is_finish;
+
+std::vector<float> do_pre_process(std::string fname_inp)
+{
+    std::vector<float> pcmf32;               // mono-channel F32 PCM
+    std::vector<std::vector<float>> pcmf32s; // stereo-channel F32 PCM
+
+    struct whisper_context ctx;
+    struct whisper_state state;
+
+    if (!read_wav(fname_inp, pcmf32, pcmf32s, false)) {
+        fprintf(stderr, "error: failed to read WAV file '%s'\n", fname_inp.c_str());
+        is_finish = true;
+        return {};
+    }
+
+    if (float(pcmf32.size())/WHISPER_SAMPLE_RATE == 0) {
+        is_finish = true;
+        return {};
+    }
+
+    if (whisper_pcm_to_mel_with_state(&ctx, &state, pcmf32.data(), pcmf32.size(), 8) != 0) {
+        printf("%s: failed to compute log mel spectrogram\n", __func__);
+    }
+
+    std::vector<float> input_data;
+    for (int j = 0; j < 80; j++) {
+        for (int i = 0; i < 3000; i++) {
+            input_data.push_back(state.mel.data[j * state.mel.n_len + i]);
+        }
+    }
+
+    return input_data;
+}