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https://github.com/love2d/megasource.git
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rude
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*
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mpg123_to_wav.c
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copyright 2007 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written by Nicholas Humfrey
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*/
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#include <stdio.h>
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#include <strings.h>
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#include <mpg123.h>
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#include <sndfile.h>
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void usage()
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{
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printf("Usage: mpg123_to_wav <input> <output> [s16|f32 [ <buffersize>]]\n");
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exit(99);
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}
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void cleanup(mpg123_handle *mh)
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{
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/* It's really to late for error checks here;-) */
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mpg123_close(mh);
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mpg123_delete(mh);
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mpg123_exit();
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}
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int main(int argc, char *argv[])
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{
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SNDFILE* sndfile = NULL;
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SF_INFO sfinfo;
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mpg123_handle *mh = NULL;
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unsigned char* buffer = NULL;
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size_t buffer_size = 0;
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size_t done = 0;
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int channels = 0, encoding = 0;
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long rate = 0;
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int err = MPG123_OK;
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off_t samples = 0;
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if (argc<3) usage();
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printf( "Input file: %s\n", argv[1]);
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printf( "Output file: %s\n", argv[2]);
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err = mpg123_init();
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if(err != MPG123_OK || (mh = mpg123_new(NULL, &err)) == NULL)
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{
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fprintf(stderr, "Basic setup goes wrong: %s", mpg123_plain_strerror(err));
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cleanup(mh);
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return -1;
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}
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/* Simple hack to enable floating point output. */
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if(argc >= 4 && !strcmp(argv[3], "f32")) mpg123_param(mh, MPG123_ADD_FLAGS, MPG123_FORCE_FLOAT, 0.);
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/* Let mpg123 work with the file, that excludes MPG123_NEED_MORE messages. */
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if( mpg123_open(mh, argv[1]) != MPG123_OK
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/* Peek into track and get first output format. */
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|| mpg123_getformat(mh, &rate, &channels, &encoding) != MPG123_OK )
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{
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fprintf( stderr, "Trouble with mpg123: %s\n", mpg123_strerror(mh) );
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cleanup(mh);
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return -1;
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}
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if(encoding != MPG123_ENC_SIGNED_16 && encoding != MPG123_ENC_FLOAT_32)
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{ /* Signed 16 is the default output format anyways; it would actually by only different if we forced it.
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So this check is here just for this explanation. */
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cleanup(mh);
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fprintf(stderr, "Bad encoding: 0x%x!\n", encoding);
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return -2;
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}
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/* Ensure that this output format will not change (it could, when we allow it). */
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mpg123_format_none(mh);
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mpg123_format(mh, rate, channels, encoding);
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bzero(&sfinfo, sizeof(sfinfo) );
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sfinfo.samplerate = rate;
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sfinfo.channels = channels;
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sfinfo.format = SF_FORMAT_WAV|(encoding == MPG123_ENC_SIGNED_16 ? SF_FORMAT_PCM_16 : SF_FORMAT_FLOAT);
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printf("Creating WAV with %i channels and %liHz.\n", channels, rate);
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sndfile = sf_open(argv[2], SFM_WRITE, &sfinfo);
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if(sndfile == NULL){ fprintf(stderr, "Cannot open output file!\n"); cleanup(mh); return -2; }
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/* Buffer could be almost any size here, mpg123_outblock() is just some recommendation.
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Important, especially for sndfile writing, is that the size is a multiple of sample size. */
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buffer_size = argc >= 5 ? atol(argv[4]) : mpg123_outblock(mh);
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buffer = malloc( buffer_size );
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do
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{
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sf_count_t more_samples;
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err = mpg123_read( mh, buffer, buffer_size, &done );
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more_samples = encoding == MPG123_ENC_SIGNED_16
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? sf_write_short(sndfile, (short*)buffer, done/sizeof(short))
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: sf_write_float(sndfile, (float*)buffer, done/sizeof(float));
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if(more_samples < 0 || more_samples*mpg123_encsize(encoding) != done)
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{
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fprintf(stderr, "Warning: Written number of samples does not match the byte count we got from libmpg123: %li != %li\n", (long)(more_samples*mpg123_encsize(encoding)), (long)done);
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}
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samples += more_samples;
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/* We are not in feeder mode, so MPG123_OK, MPG123_ERR and MPG123_NEW_FORMAT are the only possibilities.
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We do not handle a new format, MPG123_DONE is the end... so abort on anything not MPG123_OK. */
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} while (err==MPG123_OK);
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if(err != MPG123_DONE)
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fprintf( stderr, "Warning: Decoding ended prematurely because: %s\n",
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err == MPG123_ERR ? mpg123_strerror(mh) : mpg123_plain_strerror(err) );
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sf_close( sndfile );
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samples /= channels;
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printf("%li samples written.\n", (long)samples);
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cleanup(mh);
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return 0;
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}
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