找一个C++实现将PCM文件转换成MP3文件的代码，要求转换前后播放效果没有差异，能正常的播放，要能成功转换，使用第三方库或者自己编写代码实现都行，谢谢！
#include <stdio.h>
#include <lame/lame.h>
bool convertPcmToMp3(const char* pcmFilePath, const char* mp3FilePath, int sampleRate, int channels, int bitRate) {
FILE *pcmFile = fopen(pcmFilePath, "rb");
if (!pcmFile) {
return false;
}
FILE *mp3File = fopen(mp3FilePath, "wb");
if (!mp3File) {
fclose(pcmFile);
return false;
}
const int PCM_SIZE = 8192;
const int MP3_SIZE = 8192;
short pcmBuffer[PCM_SIZE * channels];
unsigned char mp3Buffer[MP3_SIZE];
lame_t lame = lame_init();
lame_set_num_channels(lame, channels);
lame_set_in_samplerate(lame, sampleRate);
lame_set_out_samplerate(lame, sampleRate);
lame_set_brate(lame, bitRate);
lame_set_mode(lame, channels == 1 ? MONO : STEREO);
lame_set_quality(lame, 2);
lame_init_params(lame);
bool success = true;
int readSize = 0;
int writeSize = 0;
do {
readSize = fread(pcmBuffer, sizeof(short) * channels, PCM_SIZE, pcmFile);
if (readSize != 0) {
if (channels == 1) {
writeSize = lame_encode_buffer(lame, pcmBuffer, NULL, readSize, mp3Buffer, MP3_SIZE);
} else {
writeSize = lame_encode_buffer_interleaved(lame, pcmBuffer, readSize, mp3Buffer, MP3_SIZE);
}
fwrite(mp3Buffer, sizeof(unsigned char), writeSize, mp3File);
} else {
// Flush the last bit of data.
writeSize = lame_encode_flush(lame, mp3Buffer, MP3_SIZE);
fwrite(mp3Buffer, sizeof(unsigned char), writeSize, mp3File);
}
} while (readSize != 0);
lame_close(lame);
fclose(pcmFile);
fclose(mp3File);
return success;
}
int main() {
const char* pcmFilePath = "input.pcm";
const char* mp3FilePath = "output.mp3";
int sampleRate = 44100; // 采样率（Hz）
int channels = 2; // 声道数（1：单声道，2：立体声）
int bitRate = 128; // 比特率（kbps）
bool success = convertPcmToMp3(pcmFilePath, mp3FilePath, sampleRate, channels, bitRate);
if (success) {
printf("PCM to MP3 conversion completed.\n");
} else {
printf("Failed to convert PCM to MP3.\n");
}
return 0;
}
【以下回答由 GPT 生成】
问题: 如何在C++中使用第三方库将PCM文件转换为MP3文件？
解决方案:
在C++中，我们可以使用libsndfile库来处理音频文件，然后使用lame库将PCM文件转换为MP3文件。
下面是解决该问题的步骤：
步骤1: 安装libsndfile库和lame库
libsndfile库：https://www.mega-nerd.com/libsndfile/lame库：https://lame.sourceforge.io/download.php安装完成后，确保库的路径已正确配置，以便在编译时能够正确引用。
步骤2: 包含必要的头文件
在你的C++代码中，需要包含以下头文件：
#include <sndfile.h>
#include <lame/lame.h>
步骤3: 打开PCM文件和创建MP3文件
// 打开PCM文件
SF_INFO pcmInfo;
SNDFILE* pcmFile = sf_open("input.pcm", SFM_READ, &pcmInfo);
if (!pcmFile) {
// 处理打开PCM文件失败的情况
}
// 创建MP3文件
FILE* mp3File = fopen("output.mp3", "wb");
if (!mp3File) {
// 处理创建MP3文件失败的情况
}
步骤4: 读取PCM数据并进行转换
constexpr int PCM_BUFFER_SIZE = 8192;
short pcmBuffer[PCM_BUFFER_SIZE];
unsigned char mp3Buffer[PCM_BUFFER_SIZE];
// 初始化lame编码器
lame_t lameEncoder = lame_init();
if (!lameEncoder) {
// 处理初始化编码器失败的情况
}
// 配置lame编码器参数（根据需要进行调整）
lame_set_in_samplerate(lameEncoder, pcmInfo.samplerate);
lame_set_out_samplerate(lameEncoder, pcmInfo.samplerate);
lame_set_num_channels(lameEncoder, pcmInfo.channels);
lame_set_VBR(lameEncoder, vbr_default);
lame_init_params(lameEncoder);
int readCount;
do {
// 读取PCM数据
readCount = sf_read_short(pcmFile, pcmBuffer, PCM_BUFFER_SIZE);
// PCM转换为MP3
int writeCount = lame_encode_buffer_interleaved(lameEncoder, pcmBuffer, readCount, mp3Buffer, PCM_BUFFER_SIZE);
// 将MP3数据写入文件
fwrite(mp3Buffer, sizeof(unsigned char), writeCount, mp3File);
} while (readCount > 0);
// 刷新lame编码器并收尾工作
int writeCount = lame_encode_flush(lameEncoder, mp3Buffer, PCM_BUFFER_SIZE);
if (writeCount > 0) {
fwrite(mp3Buffer, sizeof(unsigned char), writeCount, mp3File);
}
lame_close(lameEncoder);
步骤5: 关闭文件和释放资源
// 关闭PCM文件
sf_close(pcmFile);
// 关闭MP3文件
fclose(mp3File);
通过以上步骤，你可以使用第三方库将PCM文件转换为MP3文件。
请注意，此解决方案仅为一个示例，并未进行错误处理和完整的参数配置。在实际应用中，你可能需要根据自己的需求进行调整和优化。同时，确保在运行代码之前，正确配置库的路径以及相关依赖项。
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#include <iostream>
#include <lame/lame.h>
int main(int argc, char *argv[]) {
if (argc != 3) {
std::cerr << "Usage: " << argv[0] << " input.pcm output.mp3" << std::endl;
return 1;
}
FILE *pcmFile = fopen(argv[1], "rb");
if (!pcmFile) {
std::cerr << "Error opening input PCM file" << std::endl;
return 1;
}
FILE *mp3File = fopen(argv[2], "wb");
if (!mp3File) {
std::cerr << "Error opening output MP3 file" << std::endl;
fclose(pcmFile);
return 1;
}
lame_t lame = lame_init();
lame_set_in_samplerate(lame, 44100); // 设置采样率
lame_set_num_channels(lame, 2); // 设置通道数
lame_set_brate(lame, 128); // 设置比特率
lame_set_quality(lame, 2); // 设置质量
lame_init_params(lame);
const int PCM_SIZE = 8192;
short int pcm_buffer[PCM_SIZE];
unsigned char mp3_buffer[PCM_SIZE];
int read, write;
do {
read = fread(pcm_buffer, sizeof(short int), PCM_SIZE, pcmFile);
if (read == 0)
write = lame_encode_flush(lame, mp3_buffer, PCM_SIZE);
else
write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, PCM_SIZE);
fwrite(mp3_buffer, sizeof(unsigned char), write, mp3File);
} while (read != 0);
lame_close(lame);
fclose(mp3File);
fclose(pcmFile);
std::cout << "Conversion complete." << std::endl;
return 0;
}
帮你查了你可以参考一下：
这篇博客（https://blog.csdn.net/weixin_42578963/article/details/129575777）介绍了如何使用LAME中的lame命令行工具来将PCM文件转换为MP3文件，以及如何使用其他工具，如ffmpeg、Audacity等来进行转换。
#include <stdio.h>
#include <lame/lame.h>
bool convertPcmToMp3(const char* pcmFilePath, const char* mp3FilePath, int sampleRate, int channels, int bitRate) {
FILE *pcmFile = fopen(pcmFilePath, "rb");
if (!pcmFile) {
return false;
}
FILE *mp3File = fopen(mp3FilePath, "wb");
if (!mp3File) {
fclose(pcmFile);
return false;
}
const int PCM_SIZE = 8192;
const int MP3_SIZE = 8192;
short pcmBuffer[PCM_SIZE * channels];
unsigned char mp3Buffer[MP3_SIZE];
lame_t lame = lame_init();
lame_set_num_channels(lame, channels);
lame_set_in_samplerate(lame, sampleRate);
lame_set_out_samplerate(lame, sampleRate);
lame_set_brate(lame, bitRate);
lame_set_mode(lame, channels == 1 ? MONO : STEREO);
lame_set_quality(lame, 2);
lame_init_params(lame);
bool success = true;
int readSize = 0;
int writeSize = 0;
do {
readSize = fread(pcmBuffer, sizeof(short) * channels, PCM_SIZE, pcmFile);
if (readSize != 0) {
if (channels == 1) {
writeSize = lame_encode_buffer(lame, pcmBuffer, NULL, readSize, mp3Buffer, MP3_SIZE);
} else {
writeSize = lame_encode_buffer_interleaved(lame, pcmBuffer, readSize, mp3Buffer, MP3_SIZE);
}
fwrite(mp3Buffer, sizeof(unsigned char), writeSize, mp3File);
} else {
// Flush the last bit of data.
writeSize = lame_encode_flush(lame, mp3Buffer, MP3_SIZE);
fwrite(mp3Buffer, sizeof(unsigned char), writeSize, mp3File);
}
} while (readSize != 0);
lame_close(lame);
fclose(pcmFile);
fclose(mp3File);
return success;
}
int main() {
const char* pcmFilePath = "input.pcm";
const char* mp3FilePath = "output.mp3";
int sampleRate = 44100; // 采样率（Hz）
int channels = 2; // 声道数（1：单声道，2：立体声）
int bitRate = 128; // 比特率（kbps）
bool success = convertPcmToMp3(pcmFilePath, mp3FilePath, sampleRate, channels, bitRate);
if (success) {
printf("PCM to MP3 conversion completed.\n");
} else {
printf("Failed to convert PCM to MP3.\n");
}
return 0;
}
我来说正确答案吧: pcm不能直接转换mp3
第一：pcm首先要转成wav，参考：https://blog.csdn.net/u013113678/article/details/122268109
第二：再然后再把wav转成mp3,wav转mp3参考：https://blog.csdn.net/King1425/article/details/100172681/