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audio/flacdec: add -s SECONDS option to seek before decoding

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Sigrid 2020-08-11 17:25:53 +02:00
parent 69c3c0e6f0
commit 2e6f158f4d
1 changed files with 69 additions and 1 deletions
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70
sys/src/cmd/audio/flacdec/flacdec.c
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@ -2,6 +2,9 @@
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#define _PLAN9_SOURCE
#include <utf.h>
#include <lib9.h>
#include "FLAC/stream_decoder.h"
static int ifd = -1;
@ -31,6 +34,41 @@ decinput(FLAC__StreamDecoder *dec, FLAC__byte buffer[], size_t *bytes, void *cli
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
static FLAC__StreamDecoderSeekStatus
decseek(FLAC__StreamDecoder *dec, FLAC__uint64 absolute_byte_offset, void *client_data)
{
if(fseeko(stdin, absolute_byte_offset, SEEK_SET) < 0)
return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
}
static FLAC__StreamDecoderTellStatus
dectell(FLAC__StreamDecoder *dec, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
off_t off;
if((off = ftello(stdin)) < 0)
return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
*absolute_byte_offset = off;
return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
static FLAC__StreamDecoderTellStatus
declen(FLAC__StreamDecoder *dec, FLAC__uint64 *stream_length, void *client_data)
{
off_t off;
if((off = ftello(stdin)) < 0 || fseeko(stdin, 0, SEEK_END) < 0)
return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
*stream_length = ftello(stdin);
fseeko(stdin, off, SEEK_SET);
return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}
static FLAC__StreamDecoderWriteStatus
decoutput(FLAC__StreamDecoder *dec, FLAC__Frame *frame, FLAC__int32 *buffer[], void *client_data)
{
@ -125,13 +163,43 @@ checkeof(const FLAC__StreamDecoder*, void*)
return feof(stdin);
}
void
usage(void)
{
fprintf(stderr, "usage: %s [-s SECONDS]\n", argv0);
exit(1);
}
int main(int argc, char *argv[])
{
FLAC__bool ok = true;
FLAC__StreamDecoder *dec = 0;
double seek;
seek = 0.0;
ARGBEGIN{
case 's':
seek = atof(EARGF(usage()));
if(seek >= 0.0)
break;
default:
usage();
}ARGEND
dec = FLAC__stream_decoder_new();
FLAC__stream_decoder_init_stream(dec, decinput, NULL, NULL, NULL, checkeof, decoutput, NULL, decerror, NULL);
FLAC__stream_decoder_init_stream(dec, decinput, decseek, dectell, declen, checkeof, decoutput, NULL, decerror, NULL);
if(seek > 0.0){
FLAC__uint64 srate;
do{
FLAC__stream_decoder_process_single(dec);
srate = FLAC__stream_decoder_get_sample_rate(dec);
}while(srate == 0);
if(!FLAC__stream_decoder_seek_absolute(dec, srate*seek)){
FLAC__stream_decoder_flush(dec);
seek = 0.0;
}
fprintf(stderr, "time: %g\n", seek);
}
FLAC__stream_decoder_process_until_end_of_stream(dec);
FLAC__stream_decoder_finish(dec);
return 0;