如何将FLAC文件转换为ios中的wav文件？
我想创build一个支持Flac格式的audio文件的audio播放器。为此我试图实现flac到wav转换的algorithm，如下所示
请帮帮我。
所有这一切都给了我错误
错误：初始化解码器：FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE
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[0]====%s",argv[0]); FLAC__bool ok = true; FLAC__StreamDecoder *decoder = 0; FLAC__StreamDecoderInitStatus init_status; FILE *fout; if((fout = fopen(argv[2], "wb")) == NULL) { fprintf(stderr, "ERROR: opening %s for output\n", argv[2]); 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[init_status]); 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_get_state(decoder)]); } 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[0][i]) || /* left channel */ !write_little_endian_int16(f, (FLAC__int16)buffer[1][i]) /* 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[status]); } 我可以build议我的解决scheme。 https://github.com/Krivoblotsky/KSAudioPlayer
它支持* .flac和许多其他文件格式。
它不可能直接使用AVFoundation框架播放FLAC文件。 支持的有：
*AAC *HE-AAC *AMR (Adaptive Multi-Rate, a format for speech) *ALAC (Apple Lossless) *iLBC (internet Low Bitrate Codec, another format for speech) *IMA4 (IMA/ADPCM) *linear PCM (uncompressed) *µ-law and a-law *MP3 (MPEG-1 audio layer 3
但是在converting为上面给出的feasible format之后，可以使用AVFoundation框架来played 。
编辑 ： 库 converting to wav 。 这里很好的例子
编辑 ：使用FFMPEG库来播放FLAC