初始提交卡包 USB 工程
纳入固件源码、屏幕组件、nand_xfer 工具和文档。忽略本机构建产物、sdkconfig，以及含本机路径的依赖锁。 Co-authored-by: Cursor <[email protected]>
This commit is contained in:
zhengxin
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#include <stdint.h>
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#include "esp_log.h"
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#include "NS4168/micro_decoder_wrapper.h"
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#include "NS4168/wav_demux.h"
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#include "NS4168/ns4168.h"
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#include <math.h>
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#include <stdio.h>
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#include <stdint.h>
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static FILE* g_fp = NULL;
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void md_init(const char* path)
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{
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g_fp = fopen(path, "rb"); // 标准 C
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}
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int md_read(uint8_t* buf, int len)
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{
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if (!g_fp) return 0;
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return fread(buf, 1, len, g_fp); // 标准 C
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}
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void md_deinit()
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{
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if (g_fp) {
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fclose(g_fp); // 标准 C
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g_fp = NULL; // 标准 C（替换 nullptr）
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}
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}
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void play_wav(void)
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{
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ns4168_i2s_init();
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uint8_t header[70];
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size_t written = 0;
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int ret;
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md_init("/extflash/ring2.wav");
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md_read(header, sizeof(header));
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ESP_LOG_BUFFER_HEX("WAV", header, sizeof(header));
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ESP_LOGI("WAV", "WAV解析成功，开始播放");
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uint8_t buf[1024];
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int n;
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while ((n = md_read(buf, sizeof(buf))) > 0) {
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i2s_write(NS4168_I2S_PORT, buf, n, &written, portMAX_DELAY);
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}
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md_deinit();
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ESP_LOGI("WAV", "WAV播放结束");
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}
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/**
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* @param volume 音量系数，0.0=静音，1.0=原始音量，推荐 0.0~1.0
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*/
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void play_wav2(float volume)
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{
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uint8_t header[70];
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size_t written = 0;
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md_init("/extflash/ring2.wav");
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md_read(header, sizeof(header));
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ESP_LOG_BUFFER_HEX("WAV", header, sizeof(header));
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ESP_LOGI("WAV", "WAV解析成功，开始播放");
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uint8_t buf[1024];
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int n;
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while ((n = md_read(buf, sizeof(buf))) > 0) {
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// 仅当音量不是 1.0 时才缩放（优化性能）
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if (volume != 1.0f) {
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int16_t *samples = (int16_t *)buf;
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int num_samples = n / 2; // 假定为 16-bit PCM
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for (int i = 0; i < num_samples; i++) {
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int32_t val = (int32_t)(samples[i] * volume);
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// 饱和限幅，防止溢出破音
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if (val > 32767) val = 32767;
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if (val < -32768) val = -32768;
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samples[i] = (int16_t)val;
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}
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}
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i2s_write(NS4168_I2S_PORT, buf, n, &written, portMAX_DELAY);
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}
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md_deinit();
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ESP_LOGI("WAV", "WAV播放结束");
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}
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void play_wav3(float volume)
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{
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// 1. 打开文件
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md_init("/extflash/ring2.wav");
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// 2. 读取头部（沿用 70 字节，兼容你的原逻辑）
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uint8_t header[70];
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md_read(header, sizeof(header));
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ESP_LOG_BUFFER_HEX("WAV", header, sizeof(header));
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ESP_LOGI("WAV", "WAV解析成功，开始播放，音量=%.2f", volume);
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// 3. 将浮点音量转换为 Q15 定点数 (范围 0 ~ 32768)
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int32_t vol_fixed = (int32_t)(volume * 32768.0f + 0.5f);
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if (vol_fixed > 32768) vol_fixed = 32768;
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if (vol_fixed < 0) vol_fixed = 0;
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size_t written = 0;
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uint8_t buf[1024];
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int n;
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// 4. 循环读取音频数据并处理
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while ((n = md_read(buf, sizeof(buf))) > 0) {
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// 确保处理偶数个字节，防止破坏样本对齐
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int bytes_to_process = (n / 2) * 2;
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int num_samples = bytes_to_process / 2;
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int16_t *samples = (int16_t *)buf;
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// 音量接近静音时直接填零（避免处理微小信号产生的噪声）
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if (vol_fixed < 32) {
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memset(buf, 0, bytes_to_process);
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}
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else if (vol_fixed != 32768) { // 不等于 1.0 时才缩放
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for (int i = 0; i < num_samples; i++) {
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// 整数定点缩放 + 四舍五入
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int32_t val = ((int32_t)samples[i] * vol_fixed + 16384) >> 15;
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// 饱和限幅（实际不会溢出，但保留保护）
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if (val > 32767) val = 32767;
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if (val < -32768) val = -32768;
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samples[i] = (int16_t)val;
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}
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}
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// 发送对齐后的数据（丢弃奇数尾字节）
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i2s_write(NS4168_I2S_PORT, buf, bytes_to_process, &written, portMAX_DELAY);
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}
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// 5. 关闭文件
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md_deinit();
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ESP_LOGI("WAV", "WAV播放结束");
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}
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void play_wav4(float volume)
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{
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uint8_t header[70];
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size_t written = 0;
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md_init("/extflash/ring2.wav");
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md_read(header, sizeof(header));
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ESP_LOG_BUFFER_HEX("WAV", header, sizeof(header));
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ESP_LOGI("WAV", "WAV解析成功，开始播放");
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uint8_t buf[1024];
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int n;
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while ((n = md_read(buf, sizeof(buf))) > 0) {
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if (volume != 1.0f) {
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int16_t *samples = (int16_t *)buf;
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int num_samples = n / 2; // 16-bit PCM
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for (int i = 0; i < num_samples; i++) {
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// 浮点缩放
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float scaled = (float)samples[i] * volume;
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// 四舍五入（关键）
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int32_t val = lrintf(scaled);
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// 饱和限幅
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if (val > 32767) val = 32767;
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if (val < -32768) val = -32768;
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samples[i] = (int16_t)val;
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}
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}
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i2s_write(NS4168_I2S_PORT, buf, n, &written, portMAX_DELAY);
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}
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md_deinit();
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ESP_LOGI("WAV", "WAV播放结束");
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}
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void play_wav5(float volume)
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{
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uint8_t header[70];
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size_t written = 0;
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md_init("/extflash/ring2.wav");
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md_read(header, sizeof(header));
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ESP_LOG_BUFFER_HEX("WAV", header, sizeof(header));
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ESP_LOGI("WAV", "WAV解析成功，开始播放");
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uint8_t buf[1024];
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int n;
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// 将浮点音量转换为 8-bit 定点（0~256）
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int32_t vol_fixed = (int32_t)(volume * 256.0f);
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while ((n = md_read(buf, sizeof(buf))) > 0) {
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if (volume != 1.0f) {
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int16_t *samples = (int16_t *)buf;
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int num_samples = n / 2; // 16-bit PCM
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for (int i = 0; i < num_samples; i++) {
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// 原始 16-bit PCM
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int32_t v = samples[i];
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// 定点缩放：扩大到 24-bit 精度再缩回
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v = (v * vol_fixed) >> 8;
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// 饱和限幅
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if (v > 32767) v = 32767;
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if (v < -32768) v = -32768;
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samples[i] = (int16_t)v;
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}
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}
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i2s_write(NS4168_I2S_PORT, buf, n, &written, portMAX_DELAY);
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}
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md_deinit();
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ESP_LOGI("WAV", "WAV播放结束");
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}
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void play_wav_p4(float volume)
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{
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uint8_t header[70];
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size_t written = 0;
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md_init("/extflash/ring2.wav");
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md_read(header, sizeof(header));
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ESP_LOG_BUFFER_HEX("WAV", header, sizeof(header));
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ESP_LOGI("WAV", "WAV解析成功，开始播放");
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uint8_t buf[1024];
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int n;
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// 如果音量是 1.0，直接原样播放，完全无损
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bool bypass = (fabsf(volume - 1.0f) < 0.0001f);
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// 简单 dither 强度（可以微调）
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const float dither_amp = 1.0f / 512.0f; // 很小的抖动
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while ((n = md_read(buf, sizeof(buf))) > 0) {
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if (!bypass) {
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int16_t *samples = (int16_t *)buf;
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int num_samples = n / 2; // 16-bit PCM
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for (int i = 0; i < num_samples; i++) {
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// 提升到 float 32-bit 精度
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float v = (float)samples[i];
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// 音量缩放
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v *= volume;
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// 加一点点 dither，打散量化误差
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// 简单线性同余随机数（不依赖 rand()）
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static uint32_t rnd = 0x12345678;
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rnd = rnd * 1664525u + 1013904223u;
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float noise = ((int32_t)(rnd >> 16) - 32768) * (dither_amp / 32768.0f);
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v += noise;
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// 高精度四舍五入
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float v_rounded = floorf(v + 0.5f * (v >= 0 ? 1.0f : -1.0f));
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// 饱和限幅
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if (v_rounded > 32767.0f) v_rounded = 32767.0f;
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if (v_rounded < -32768.0f) v_rounded = -32768.0f;
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samples[i] = (int16_t)v_rounded;
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}
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}
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i2s_write(NS4168_I2S_PORT, buf, n, &written, portMAX_DELAY);
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}
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md_deinit();
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ESP_LOGI("WAV", "WAV播放结束");
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}
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#include <stdbool.h>
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#include "driver/i2s.h"
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// 简单的 32-bit 伪随机数，用于 dither
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static inline uint32_t prng32(void)
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{
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static uint32_t s = 0x12345678u;
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s = s * 1664525u + 1013904223u;
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return s;
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}
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void play_wav_ring_with_volume(float volume)
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{
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const char *TAG = "WAV_RING";
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uint8_t header[70];
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size_t written = 0;
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// 初始化并读取 WAV 头
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md_init("/extflash/ring2.wav");
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md_read(header, sizeof(header));
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ESP_LOG_BUFFER_HEX(TAG, header, sizeof(header));
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ESP_LOGI(TAG, "WAV解析成功，开始播放");
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uint8_t buf[1024];
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int n;
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// 音量为 1.0 时完全绕过处理，保证绝对无损
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bool bypass = (fabsf(volume - 1.0f) < 0.0001f);
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// dither 强度（非常小，人耳几乎感知不到）
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const float dither_amp = 1.0f / 4096.0f; // 可微调
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while ((n = md_read(buf, sizeof(buf))) > 0) {
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if (!bypass) {
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int16_t *samples = (int16_t *)buf;
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int num_samples = n / 2; // 16-bit PCM
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for (int i = 0; i < num_samples; i++) {
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// 提升到 float 32-bit 精度
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float v = (float)samples[i];
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// 音量缩放
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v *= volume;
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// 三角 dither（TDPF）：(rand1 - rand2) * scale
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uint32_t r1 = prng32();
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uint32_t r2 = prng32();
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float noise = ((int32_t)(r1 & 0xFFFF) - (int32_t)(r2 & 0xFFFF))
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* (dither_amp / 65536.0f);
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v += noise;
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// 高精度四舍五入
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float v_rounded = floorf(v + 0.5f * (v >= 0.0f ? 1.0f : -1.0f));
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// 轻微 soft-clip，避免极端削波毛刺
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if (v_rounded > 32767.0f) {
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float over = v_rounded - 32767.0f;
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v_rounded = 32767.0f + over * 0.01f; // 把硬削波变成软削波
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} else if (v_rounded < -32768.0f) {
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float under = v_rounded + 32768.0f;
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v_rounded = -32768.0f + under * 0.01f;
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}
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// 最终饱和限幅
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if (v_rounded > 32767.0f) v_rounded = 32767.0f;
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if (v_rounded < -32768.0f) v_rounded = -32768.0f;
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samples[i] = (int16_t)v_rounded;
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}
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}
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// 写入 I2S
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i2s_write(NS4168_I2S_PORT, buf, n, &written, portMAX_DELAY);
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}
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md_deinit();
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ESP_LOGI(TAG, "WAV播放结束");
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}
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