audio/flacenc
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Sigrid
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4 changed files with 202 additions and 7 deletions
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@ -1,6 +1,6 @@
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.TH AUDIO 1
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.SH NAME
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mp3dec, mp3enc, oggdec, oggenc, flacdec, sundec, wavdec, pcmconv, mixfs \- decode and encode audio files
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mp3dec, mp3enc, oggdec, oggenc, flacdec, flacenc, sundec, wavdec, pcmconv, mixfs \- decode and encode audio files
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.SH SYNOPSIS
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.B audio/mp3dec
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[
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@ -55,6 +55,27 @@ q ] [
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] [
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.I "long or silly options"
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]
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.br
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.B audio/flacenc
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[
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.B -b
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.I bitspersample
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] [
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.B -c
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.I channels
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] [
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.B -l
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.I compresslevel
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] [
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.B -s
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.I sfreq
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] [
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.B -P
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.I padding
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] [
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.B -T
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.I field=value
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]
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.PP
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.B audio/pcmconv
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[
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@ -107,10 +128,11 @@ seek to a specific position in seconds before decoding.
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The encoders read PCM on standard input and produce compressed audio
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on standard output.
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.PP
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.I Oggenc
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.I Flacenc,
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.I oggenc
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and
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.I mp3enc
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produce OGG Vorbis and MP3 audio. For
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produce FLAC, OGG Vorbis and MP3 audio. For
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.I mp3enc,
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the MP3 file will use `constant bit-rate' (CBR) encoding by default,
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but that can be changed via
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@ -120,11 +142,13 @@ or
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.BR -v
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(variable bitrate, VBR).
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.PP
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.I Oggenc
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accepts raw PCM in the same byte order as
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.I Flacenc
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and
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.I oggenc
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accept raw PCM in the same byte order as
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.B /dev/audio
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(little-endian),
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t
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while
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.I mp3enc -r
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expects big-endian.
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.SS Encoding options
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@ -380,3 +404,5 @@ dd -conv swab | audio/mp3enc -a -r -m m --resample 16 -b 24
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first appeared in 9front (December, 2012).
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.I Mixfs
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first appeared in 9front (December, 2013).
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.I Flacenc
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first appeared in 9front (January, 2020).
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148
sys/src/cmd/audio/flacenc/flacenc.c
Normal file
148
sys/src/cmd/audio/flacenc/flacenc.c
Normal file
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define _PLAN9_SOURCE
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#include <utf.h>
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#include <lib9.h>
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#include "FLAC/stream_encoder.h"
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#include "FLAC/metadata.h"
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static FLAC__StreamEncoderReadStatus
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encwrite(FLAC__StreamEncoder *enc, FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data)
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{
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return fwrite(buffer, 1, bytes, stdout) != bytes ?
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FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR :
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FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
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}
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static FLAC__StreamEncoderSeekStatus
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encseek(FLAC__StreamEncoder *enc, FLAC__uint64 absolute_byte_offset, void *client_data)
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{
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return fseeko(stdout, absolute_byte_offset, SEEK_SET) != absolute_byte_offset ?
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FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED :
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FLAC__STREAM_ENCODER_SEEK_STATUS_OK;
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}
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static FLAC__StreamEncoderTellStatus
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enctell(FLAC__StreamEncoder *enc, FLAC__uint64 *absolute_byte_offset, void *client_data)
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{
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off_t off;
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if((off = ftello(stdout)) < 0)
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return FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED;
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*absolute_byte_offset = off;
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return FLAC__STREAM_ENCODER_TELL_STATUS_OK;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-b bitspersample] [-c channels] [-l compresslevel] [-r sfreq] [-P padding] [-T field=value]\n", argv0);
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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int i, n, nm, r, be, bits, chan, level, sfreq;
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FLAC__StreamMetadata_VorbisComment_Entry vc;
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FLAC__StreamMetadata *m[2];
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uint32_t beef = 0xdeadbeef;
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FLAC__StreamEncoder *enc;
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FLAC__int32 *buf;
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int16_t *x;
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be = *((uint8_t*)&beef) == 0xde;
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m[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
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nm = 1;
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bits = 16;
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chan = 2;
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sfreq = 44100;
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level = -1;
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ARGBEGIN{
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case 'b':
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bits = atoi(EARGF(usage()));
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if(bits <= 8 || bits > 32){
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fprintf(stderr, "bits per sample = %d not supported\n");
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exit(1);
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}
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break;
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case 'c':
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chan = atoi(EARGF(usage()));
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break;
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case 'l':
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level = atoi(EARGF(usage()));
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break;
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case 's':
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sfreq = atoi(EARGF(usage()));
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break;
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case 'P':
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m[nm] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
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m[nm++]->length = atoi(EARGF(usage()));
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break;
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case 'T':
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vc.entry = (FLAC__byte*)EARGF(usage());
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vc.length = strlen((char*)vc.entry);
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FLAC__metadata_object_vorbiscomment_append_comment(m[0], vc, true);
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break;
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default:
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usage();
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}ARGEND
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if(argc != 0)
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usage();
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n = chan * 4096;
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if((buf = malloc(n*4)) == NULL){
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fprintf(stderr, "no memory\n");
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exit(1);
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}
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x = (int16_t*)buf + (bits > 16 ? 0 : n);
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if((enc = FLAC__stream_encoder_new()) == NULL){
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fprintf(stderr, "failed to create encoder\n");
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exit(1);
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}
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FLAC__stream_encoder_set_bits_per_sample(enc, bits);
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FLAC__stream_encoder_set_channels(enc, chan);
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FLAC__stream_encoder_set_sample_rate(enc, sfreq);
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if(level >= 0)
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FLAC__stream_encoder_set_compression_level(enc, level);
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if(!FLAC__stream_encoder_set_metadata(enc, m, nm)){
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fprintf(stderr, "failed to set metadata\n");
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exit(1);
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}
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if(FLAC__stream_encoder_init_stream(enc, encwrite, encseek, enctell, NULL, NULL) != FLAC__STREAM_ENCODER_INIT_STATUS_OK){
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fprintf(stderr, "failed to init the stream\n");
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exit(1);
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}
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for(;;){
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r = fread(x, bits > 16 ? 4 : 2, n, stdin);
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if(r < 1)
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break;
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if(bits <= 16){
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for(i = 0; i < r; i++)
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buf[i] = be ? x[i]<<8 | x[i]>>8 : x[i];
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}else if(be){
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for(i = 0; i < r; i++)
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buf[i] = buf[i]<<24 | (buf[i]<<8)&0xff0000 | (buf[i]>>8)&0xff00 | buf[i]>>24;
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}
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if(!FLAC__stream_encoder_process_interleaved(enc, buf, r/chan)){
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fprintf(stderr, "encoding failed\n");
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exit(1);
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}
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}
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if(!FLAC__stream_encoder_finish(enc)){
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fprintf(stderr, "encoding failed\n");
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exit(1);
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}
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FLAC__stream_encoder_delete(enc);
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return 0;
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}
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21
sys/src/cmd/audio/flacenc/mkfile
Normal file
21
sys/src/cmd/audio/flacenc/mkfile
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</$objtype/mkfile
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<../config
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TARGET=flacenc
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CC=pcc
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CFLAGS=-I. -I../libFLAC -I../libFLAC/FLAC -D_POSIX_SOURCE -D_BSD_EXTENSION -DPlan9 -c
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%.$O: %.c
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$CC $CFLAGS -c $stem.c
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$O.%: %.$O ../libFLAC/libFLAC.a$O
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$CC -o $target $prereq
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all:V: $O.$TARGET
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clean:V:
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rm -f *.[$OS] [$OS].$TARGET
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install:V: $O.$TARGET
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cp $O.$TARGET $BIN/$TARGET
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@ -1,7 +1,7 @@
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</$objtype/mkfile
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LIBS=libogg libvorbis libFLAC
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PROGS=pcmconv oggdec oggenc mp3dec mp3enc flacdec wavdec sundec mixfs
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PROGS=pcmconv oggdec oggenc mp3dec mp3enc flacdec flacenc wavdec sundec mixfs
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#libs must be made first
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DIRS=$LIBS $PROGS
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