读取wave文件信息例子

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读取wave文件信息例子

读取wave文件信息，打印文件头各字段的内容，以及音频数据的二进制值。wave文件的音频数据可能是各种压缩采样格式的。

李国帅 2010

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned long uint32;
typedef enum { false, true } boolean;
typedef struct
{unsigned char chunkID[4]; // Contiene le lettere "RIFF" in formato ASCII form (0x52494646 formato big-endian)unsigned int ChunkSize; // 36 + SubChunk2Size, o più precisamente:// 4 + (8 + SubChunk1Size) + (8 + SubChunk2Size)// Questa è la dimensione del resto del chunk che segue questo numero.Questa è la dimensione dell'intero file// in bytes meno 8 bytes per i due campi non inclusi in queto conteggio// ChunkID e ChunkSize.unsigned char Format[4]; // Contiene le lettere "WAVE"(0x57415645 formato big-endian).unsigned char Subchunk1ID[4]; // Contiene le lettere "fmt " (0x666d7420 formato big-endian).unsigned int Subchunk1Size; // 16 for PCM. This is the size of the rest of the Subchunk which follows this numbershort int AudioFormat; // PCM = 1 (i.e. Linear quantization)// Values other than 1 indicate someform of compression.short int NumChannels; // Mono = 1, Stereo += 2, etc.int SampleRate; // 8000, 44100, etc.int ByteRate; // = SampleRate * NumChannels * BitsPerSample/8short int BlockAlign; // = NumChannels * BitsPerSample/8// The number of bytes for one sample including all channelsshort int BitsPerSample;// 8 bits += 8, 16 bits += 16, etc.short int Extra;unsigned char Data[4]; // Contains the letters "data" (0x64617461 big-endian form).unsigned int DataSize; // = NumSamples * NumChannels * BitsPerSample/8 This is the number of bytes in the data.
} __attribute__((packed)) RIFF_HEADER;boolean ispadded(RIFF_HEADER *header);
int main(int argc, char *argv[])
{RIFF_HEADER *header;FILE *fp;int i;int num_neg = 0;int num_pos = 0;short int c;char *filename;char *dati;if (argc > 1){printf("Lunghezza argv[1]: %d\n", strlen(argv[1]));filename = (char *)(malloc(strlen(argv[1]) + 1));strcpy(filename, argv[1]);printf("Filename:%s\n", filename);fp = fopen(filename, "rb");}header = (RIFF_HEADER *)malloc(sizeof(RIFF_HEADER));printf("Header Size=%d\n", sizeof(RIFF_HEADER));fread(header, sizeof(RIFF_HEADER), 1, fp);printf("Is Padded %d\n", ispadded(header));printf("ChunkID:%4.4s\n", header->chunkID);printf("ChunkSize:%u\n", header->ChunkSize);printf("Format:%4.4s\n", header->Format);printf("Subchunk1ID:%4.4s\n", header->Subchunk1ID);printf("Subchunk1Size:%u\n", header->Subchunk1Size);printf("AudioFormat:%d\n", header->AudioFormat);printf("NumChannels:%d\n", header->NumChannels);printf("SampleRate:%d\n", header->SampleRate);printf("ByteRate:%d\n", header->ByteRate);printf("BlockAlign:%d\n", header->BlockAlign);printf("BitsPerSample:%d\n", header->BitsPerSample);printf("Extra:%d\n", header->Extra);printf("Data:%4.4s\n", header->Data);printf("DataSize:%u\n", (header->DataSize));dati = (char *)malloc(header->DataSize + 1);if (dati == NULL) printf("Errore. memoria insufficiente!\n");i = 0;//if (fread(dati,header->DataSize,1,fp)>0) printf("Lettura eseguita correttamente\n");//else//printf("Lettura non eseguita correttamente\n");//printf("strlen(dati)=%d\n",strlen(dati));//dati[strlen(dati)+1]='\0';//printf("strlen(dati)=%d\n",strlen(dati));//fread(&c,sizeof(int),1,fp);while (fread(&c, sizeof(short int), 1, fp) > 0){if (c > 0) num_pos++;elsenum_neg++;printf("%hd\n", c);}printf("\n Neg:%d Pos:%d\n", num_neg, num_pos);//while(*dati!='\0'){//for (i=0;i<header->DataSize;i++)//printf("\t i=%d dati=%d",i,dati[i]);return 0;
}
boolean ispadded(RIFF_HEADER *header)
{short int sizeofheaders = sizeof(RIFF_HEADER);short int size_of_fields = 0;size_of_fields += sizeof(header->chunkID);size_of_fields += sizeof(header->ChunkSize);size_of_fields += sizeof(header->Format);size_of_fields += sizeof(header->Subchunk1ID);size_of_fields += sizeof(header->Subchunk1Size);size_of_fields += sizeof(header->AudioFormat);size_of_fields += sizeof(header->NumChannels);size_of_fields += sizeof(header->SampleRate);size_of_fields += sizeof(header->ByteRate);size_of_fields += sizeof(header->BlockAlign);size_of_fields += sizeof(header->BitsPerSample);size_of_fields += sizeof(header->Data);size_of_fields += sizeof(header->DataSize);size_of_fields += sizeof(header->Extra);printf("Header size=%d fields size=%d\n", sizeofheaders, size_of_fields);return (sizeofheaders == size_of_fields);
}