iphone - 如何在ios中将FLAC文件转换为wav文件？
<p><p><em>我想创建一个支持 Flac 格式的音频文件的音频播放器。为此我尝试实现 flac 到 wav 转换的算法，如下所示</em></p>
<p>请帮帮我。</p>
<p>它总是给我错误</p>
<p>错误:初始化解码器:FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE</p>
<pre><code>static FLAC__bool write_little_endian_uint16(FILE *f, FLAC__uint16 x)
{
return
fputc(x, f) != EOF &&
fputc(x >> 8, f) != EOF
;
}
static FLAC__bool write_little_endian_int16(FILE *f, FLAC__int16 x)
{
return write_little_endian_uint16(f, (FLAC__uint16)x);
}
static FLAC__bool write_little_endian_uint32(FILE *f, FLAC__uint32 x)
{
return
fputc(x, f) != EOF &&
fputc(x >> 8, f) != EOF &&
fputc(x >> 16, f) != EOF &&
fputc(x >> 24, f) != EOF
;
}
int main(int argc, char *argv[])
{
const char *input = "demo_audio_shaer.flac";
printf("aa====%s",argv);
FLAC__bool ok = true;
FLAC__StreamDecoder *decoder = 0;
FLAC__StreamDecoderInitStatus init_status;
FILE *fout;
if((fout = fopen(argv, "wb")) == NULL) {
fprintf(stderr, "ERROR: opening %s for output\n", argv);
return 1;
}
if((decoder = FLAC__stream_decoder_new()) == NULL) {
fprintf(stderr, "ERROR: allocating decoder\n");
fclose(fout);
return 1;
}
(void)FLAC__stream_decoder_set_md5_checking(decoder, true);
init_status = FLAC__stream_decoder_init_file(decoder, input, write_callback, metadata_callback, error_callback, /*client_data=*/fout);
if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
fprintf(stderr, "ERROR: initializing decoder: %s\n", FLAC__StreamDecoderInitStatusString);
ok = false;
}
if(ok) {
ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
fprintf(stderr, "decoding: %s\n", ok? "succeeded" : "FAILED");
fprintf(stderr, " state: %s\n", FLAC__StreamDecoderStateString);
}
FLAC__stream_decoder_delete(decoder);
fclose(fout);
return 0;
}
FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
{
FILE *f = (FILE*)client_data;
const FLAC__uint32 total_size = (FLAC__uint32)(total_samples * channels * (bps/8));
size_t i;
(void)decoder;
if(total_samples == 0) {
fprintf(stderr, "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if(channels != 2 || bps != 16) {
fprintf(stderr, "ERROR: this example only supports 16bit stereo streams\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
/* write WAVE header before we write the first frame */
if(frame->header.number.sample_number == 0) {
if(
fwrite("RIFF", 1, 4, f) < 4 ||
!write_little_endian_uint32(f, total_size + 36) ||
fwrite("WAVEfmt ", 1, 8, f) < 8 ||
!write_little_endian_uint32(f, 16) ||
!write_little_endian_uint16(f, 1) ||
!write_little_endian_uint16(f, (FLAC__uint16)channels) ||
!write_little_endian_uint32(f, sample_rate) ||
!write_little_endian_uint32(f, sample_rate * channels * (bps/8)) ||
!write_little_endian_uint16(f, (FLAC__uint16)(channels * (bps/8))) || /* block align */
!write_little_endian_uint16(f, (FLAC__uint16)bps) ||
fwrite("data", 1, 4, f) < 4 ||
!write_little_endian_uint32(f, total_size)
)
{
fprintf(stderr, "ERROR: write error\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
}
/* write decoded PCM samples */
for(i = 0; i < frame->header.blocksize; i++) {
if(
!write_little_endian_int16(f, (FLAC__int16)buffer) ||/* left channel */
!write_little_endian_int16(f, (FLAC__int16)buffer) /* right channel */
) {
fprintf(stderr, "ERROR: write error\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
{
(void)decoder, (void)client_data;
/* print some stats */
if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
/* save for later */
total_samples = metadata->data.stream_info.total_samples;
sample_rate = metadata->data.stream_info.sample_rate;
channels = metadata->data.stream_info.channels;
bps = metadata->data.stream_info.bits_per_sample;
fprintf(stderr, "sample rate : %u Hz\n", sample_rate);
fprintf(stderr, "channels : %u\n", channels);
fprintf(stderr, "bits per sample: %u\n", bps);
#ifdef _MSC_VER
fprintf(stderr, "total samples: %I64u\n", total_samples);
#else
fprintf(stderr, "total samples: %llu\n", total_samples);
#endif
}
}
void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
{
(void)decoder, (void)client_data;
fprintf(stderr, "Got error callback: %s\n", FLAC__StreamDecoderErrorStatusString);
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我可以提出我的解决方案。
<a href="https://github.com/Krivoblotsky/KSAudioPlayer" rel="noreferrer noopener nofollow">https://github.com/Krivoblotsky/KSAudioPlayer</a> </p>
<p>它支持 *.flac 和许多其他文件格式。</p></p>
<p style="font-size: 20px;">关于iphone - 如何在ios中将FLAC文件转换为wav文件？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/16080888/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/16080888/
</a>
</p>
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