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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define _PLAN9_SOURCE
#include <utf.h>
#include <lib9.h>
#include "FLAC/stream_encoder.h"
#include "FLAC/metadata.h"
static FLAC__StreamEncoderReadStatus
encwrite(FLAC__StreamEncoder *enc, FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data)
{
return fwrite(buffer, 1, bytes, stdout) != bytes ?
FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR :
FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
}
static FLAC__StreamEncoderSeekStatus
encseek(FLAC__StreamEncoder *enc, FLAC__uint64 absolute_byte_offset, void *client_data)
{
return fseeko(stdout, absolute_byte_offset, SEEK_SET) != 0 ?
FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED :
FLAC__STREAM_ENCODER_SEEK_STATUS_OK;
}
static FLAC__StreamEncoderTellStatus
enctell(FLAC__StreamEncoder *enc, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
off_t off;
if((off = ftello(stdout)) < 0)
return FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED;
*absolute_byte_offset = off;
return FLAC__STREAM_ENCODER_TELL_STATUS_OK;
}
static void
usage(void)
{
fprintf(stderr, "usage: %s [-b bitspersample] [-c channels] [-l compresslevel] [-s sfreq] [-P padding] [-T field=value]\n", argv0);
exit(1);
}
int
main(int argc, char *argv[])
{
int i, n, nm, r, be, bits, chan, level, sfreq;
FLAC__StreamMetadata_VorbisComment_Entry vc;
FLAC__StreamMetadata *m[2];
uint32_t beef = 0xdeadbeef;
FLAC__StreamEncoder *enc;
FLAC__int32 *buf;
int16_t *x;
be = *((uint8_t*)&beef) == 0xde;
m[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
nm = 1;
bits = 16;
chan = 2;
sfreq = 44100;
level = -1;
ARGBEGIN{
case 'b':
bits = atoi(EARGF(usage()));
if(bits <= 8 || bits > 32){
fprintf(stderr, "bits per sample = %d not supported\n", bits);
exit(1);
}
break;
case 'c':
chan = atoi(EARGF(usage()));
break;
case 'l':
level = atoi(EARGF(usage()));
break;
case 's':
sfreq = atoi(EARGF(usage()));
break;
case 'P':
m[nm] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
m[nm++]->length = atoi(EARGF(usage()));
break;
case 'T':
vc.entry = (FLAC__byte*)EARGF(usage());
vc.length = strlen((char*)vc.entry);
FLAC__metadata_object_vorbiscomment_append_comment(m[0], vc, true);
break;
default:
usage();
}ARGEND
if(argc != 0)
usage();
n = chan * 4096;
if((buf = malloc(n*4)) == NULL){
fprintf(stderr, "no memory\n");
exit(1);
}
x = (int16_t*)buf + (bits > 16 ? 0 : n);
if((enc = FLAC__stream_encoder_new()) == NULL){
fprintf(stderr, "failed to create encoder\n");
exit(1);
}
FLAC__stream_encoder_set_bits_per_sample(enc, bits);
FLAC__stream_encoder_set_channels(enc, chan);
FLAC__stream_encoder_set_sample_rate(enc, sfreq);
if(level >= 0)
FLAC__stream_encoder_set_compression_level(enc, level);
if(!FLAC__stream_encoder_set_metadata(enc, m, nm)){
fprintf(stderr, "failed to set metadata\n");
exit(1);
}
if(FLAC__stream_encoder_init_stream(enc, encwrite, encseek, enctell, NULL, NULL) != FLAC__STREAM_ENCODER_INIT_STATUS_OK){
fprintf(stderr, "failed to init the stream\n");
exit(1);
}
for(;;){
r = fread(x, bits > 16 ? 4 : 2, n, stdin);
if(r < 1)
break;
if(bits <= 16){
for(i = 0; i < r; i++)
buf[i] = be ? x[i]<<8 | x[i]>>8 : x[i];
}else if(be){
for(i = 0; i < r; i++)
buf[i] = buf[i]<<24 | (buf[i]<<8)&0xff0000 | (buf[i]>>8)&0xff00 | buf[i]>>24;
}
if(!FLAC__stream_encoder_process_interleaved(enc, buf, r/chan)){
fprintf(stderr, "encoding failed\n");
exit(1);
}
}
if(!FLAC__stream_encoder_finish(enc)){
fprintf(stderr, "encoding failed\n");
exit(1);
}
FLAC__stream_encoder_delete(enc);
return 0;
}
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