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我有.wav文件，我會使用opus對它們進行編碼，將所有內容寫入.opus文件，然後使用vlc讀取它。我用一些簡單的例子做了一些代碼，但質量很差。事實上，有一個問題，我從來沒有寫過任何標題，這是正常的嗎？我什麼都忘記了？如何用libopus獲得一個合適的opus文件？
#define FRAME_SIZE 960
#define SAMPLE_RATE 48000 //frequence
#define CHANNELS 1 // up to 255
#define APPLICATION OPUS_APPLICATION_AUDIO
#define MAX_FRAME_SIZE 6*960
#define MAX_PACKET_SIZE (3*1276)
#define BUFFER_LEN 1024
int main(int argc, char **argv)
{
char *inFile;
FILE *fin;
char *outFile;
FILE *fout;
opus_int16 in[FRAME_SIZE*CHANNELS];
unsigned char cbits[MAX_PACKET_SIZE];
OpusEncoder *encoder;
int err;
/*Create a new encoder state */
encoder = opus_encoder_create(SAMPLE_RATE, CHANNELS, APPLICATION, &err);
if (err<0)
{
fprintf(stderr, "failed to create an encoder: %s\n", opus_strerror(err));
return EXIT_FAILURE;
}
opus_encoder_ctl(encoder, OPUS_SET_BITRATE(512000)); //500 to 512 000 // 350 000 pas trop mal
if (err<0)
{
fprintf(stderr, "failed to set bitrate: %s\n", opus_strerror(err));
return EXIT_FAILURE;
}
inFile = "toencode.wav";
fin = fopen(inFile, "r");
if (fin==NULL)
{
fprintf(stderr, "in: failed to open file: %s\n", strerror(errno));
return EXIT_FAILURE;
}
if (err<0)
{
fprintf(stderr, "failed to create decoder: %s\n", opus_strerror(err));
return EXIT_FAILURE;
}
outFile = "encoded.opus";
fout = fopen(outFile, "w");
if (fout==NULL)
{
fprintf(stderr, "failed to open file: %s\n", strerror(errno));
return EXIT_FAILURE;
}
while (1)
{
int i;
unsigned char pcm_bytes[MAX_FRAME_SIZE*CHANNELS*2];
/* Read a 16 bits/sample audio frame. */
fread(pcm_bytes, sizeof(short)*CHANNELS, FRAME_SIZE, fin);
if (feof(fin))
break;
/* Convert from little-endian ordering. */
for (i=0;i<CHANNELS*FRAME_SIZE;i++)
in[i]=pcm_bytes[2*i+1]<<8|pcm_bytes[2*i];
/* Encode the frame. */
if (opus_encode(encoder, in, FRAME_SIZE, cbits, MAX_PACKET_SIZE)<0)
{
// fprintf(stderr, "encode failed: %s\n", opus_strerror(nbBytes));
return EXIT_FAILURE;
}
fwrite(in,sizeof(short),sizeof(in),fout);
}
/*Destroy the encoder state*/
opus_encoder_destroy(encoder);
fclose(fin);
fclose(fout);
return EXIT_SUCCESS;
}
我覺得有一個真正的問題，我怎麼寫文件，但我不知道它來自哪裏，你能幫我嗎？