X-Git-Url: http://git.ieval.ro/?a=blobdiff_plain;f=libsamplerate%2Fexamples%2Fsndfile-resample.c;fp=libsamplerate%2Fexamples%2Fsndfile-resample.c;h=10d1619ea398c40cf798410899bbbe16a24f599a;hb=8529da432e52c7903e8ef3488e60725a099e6e63;hp=0000000000000000000000000000000000000000;hpb=27013d8f68878b8ed2d3f747e26f562d08d7d678;p=audio-libsamplerate.git diff --git a/libsamplerate/examples/sndfile-resample.c b/libsamplerate/examples/sndfile-resample.c new file mode 100644 index 0000000..10d1619 --- /dev/null +++ b/libsamplerate/examples/sndfile-resample.c @@ -0,0 +1,328 @@ +/* +** Copyright (c) 2002-2016, Erik de Castro Lopo +** All rights reserved. +** +** This code is released under 2-clause BSD license. Please see the +** file at : https://github.com/erikd/libsamplerate/blob/master/COPYING +*/ + +#include "config.h" + +#include +#include +#include +#include +#include + +#if (HAVE_SNDFILE) + +#include +#include + +#define DEFAULT_CONVERTER SRC_SINC_MEDIUM_QUALITY + +#define BUFFER_LEN 4096 /*-(1<<16)-*/ + +static void usage_exit (const char *progname) ; +static sf_count_t sample_rate_convert (SNDFILE *infile, SNDFILE *outfile, int converter, double src_ratio, int channels, double * gain, int normalize) ; +static double apply_gain (float * data, long frames, int channels, double max, double gain) ; + +int +main (int argc, char *argv []) +{ SNDFILE *infile, *outfile = NULL ; + SF_INFO sfinfo ; + + int normalize = 1 ; + sf_count_t count ; + double src_ratio = -1.0, gain = 1.0 ; + int new_sample_rate = -1, k, converter, max_speed = SF_FALSE ; + + if (argc == 2 && strcmp (argv [1], "--version") == 0) + { char buffer [64], *cptr ; + + if ((cptr = strrchr (argv [0], '/')) != NULL) + argv [0] = cptr + 1 ; + if ((cptr = strrchr (argv [0], '\\')) != NULL) + argv [0] = cptr + 1 ; + + sf_command (NULL, SFC_GET_LIB_VERSION, buffer, sizeof (buffer)) ; + + printf ("%s (%s,%s)\n", argv [0], src_get_version (), buffer) ; + exit (0) ; + } ; + + if (argc != 5 && argc != 7 && argc != 8) + usage_exit (argv [0]) ; + + /* Set default converter. */ + converter = DEFAULT_CONVERTER ; + + for (k = 1 ; k < argc - 2 ; k++) + { if (strcmp (argv [k], "--max-speed") == 0) + max_speed = SF_TRUE ; + else if (strcmp (argv [k], "--no-normalize") == 0) + normalize = 0 ; + else if (strcmp (argv [k], "-to") == 0) + { k ++ ; + new_sample_rate = atoi (argv [k]) ; + } + else if (strcmp (argv [k], "-by") == 0) + { k ++ ; + src_ratio = atof (argv [k]) ; + } + else if (strcmp (argv [k], "-c") == 0) + { k ++ ; + converter = atoi (argv [k]) ; + } + else + usage_exit (argv [0]) ; + } ; + + if (new_sample_rate <= 0 && src_ratio <= 0.0) + usage_exit (argv [0]) ; + + if (src_get_name (converter) == NULL) + { printf ("Error : bad converter number.\n") ; + usage_exit (argv [0]) ; + } ; + + if (strcmp (argv [argc - 2], argv [argc - 1]) == 0) + { printf ("Error : input and output file names are the same.\n") ; + exit (1) ; + } ; + + if ((infile = sf_open (argv [argc - 2], SFM_READ, &sfinfo)) == NULL) + { printf ("Error : Not able to open input file '%s'\n", argv [argc - 2]) ; + exit (1) ; + } ; + + printf ("Input File : %s\n", argv [argc - 2]) ; + printf ("Sample Rate : %d\n", sfinfo.samplerate) ; + printf ("Input Frames : %ld\n\n", (long) sfinfo.frames) ; + + if (new_sample_rate > 0) + { src_ratio = (1.0 * new_sample_rate) / sfinfo.samplerate ; + sfinfo.samplerate = new_sample_rate ; + } + else if (src_is_valid_ratio (src_ratio)) + sfinfo.samplerate = (int) floor (sfinfo.samplerate * src_ratio) ; + else + { printf ("Not able to determine new sample rate. Exiting.\n") ; + sf_close (infile) ; + exit (1) ; + } ; + + if (fabs (src_ratio - 1.0) < 1e-20) + { printf ("Target samplerate and input samplerate are the same. Exiting.\n") ; + sf_close (infile) ; + exit (0) ; + } ; + + printf ("SRC Ratio : %f\n", src_ratio) ; + printf ("Converter : %s\n\n", src_get_name (converter)) ; + + if (src_is_valid_ratio (src_ratio) == 0) + { printf ("Error : Sample rate change out of valid range.\n") ; + sf_close (infile) ; + exit (1) ; + } ; + + /* Delete the output file length to zero if already exists. */ + remove (argv [argc - 1]) ; + + printf ("Output file : %s\n", argv [argc - 1]) ; + printf ("Sample Rate : %d\n", sfinfo.samplerate) ; + + do + { sf_close (outfile) ; + + if ((outfile = sf_open (argv [argc - 1], SFM_WRITE, &sfinfo)) == NULL) + { printf ("Error : Not able to open output file '%s'\n", argv [argc - 1]) ; + sf_close (infile) ; + exit (1) ; + } ; + + if (max_speed) + { /* This is mainly for the comparison program tests/src-evaluate.c */ + sf_command (outfile, SFC_SET_ADD_PEAK_CHUNK, NULL, SF_FALSE) ; + } + else + { /* Update the file header after every write. */ + sf_command (outfile, SFC_SET_UPDATE_HEADER_AUTO, NULL, SF_TRUE) ; + } ; + + sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ; + + count = sample_rate_convert (infile, outfile, converter, src_ratio, sfinfo.channels, &gain, normalize) ; + } + while (count < 0) ; + + printf ("Output Frames : %ld\n\n", (long) count) ; + + sf_close (infile) ; + sf_close (outfile) ; + + return 0 ; +} /* main */ + +/*============================================================================== +*/ + +static sf_count_t +sample_rate_convert (SNDFILE *infile, SNDFILE *outfile, int converter, double src_ratio, int channels, double * gain, int normalize) +{ static float input [BUFFER_LEN] ; + static float output [BUFFER_LEN] ; + + SRC_STATE *src_state ; + SRC_DATA src_data ; + int error ; + double max = 0.0 ; + sf_count_t output_count = 0 ; + + sf_seek (infile, 0, SEEK_SET) ; + sf_seek (outfile, 0, SEEK_SET) ; + + /* Initialize the sample rate converter. */ + if ((src_state = src_new (converter, channels, &error)) == NULL) + { printf ("\n\nError : src_new() failed : %s.\n\n", src_strerror (error)) ; + exit (1) ; + } ; + + src_data.end_of_input = 0 ; /* Set this later. */ + + /* Start with zero to force load in while loop. */ + src_data.input_frames = 0 ; + src_data.data_in = input ; + + src_data.src_ratio = src_ratio ; + + src_data.data_out = output ; + src_data.output_frames = BUFFER_LEN /channels ; + + while (1) + { + /* If the input buffer is empty, refill it. */ + if (src_data.input_frames == 0) + { src_data.input_frames = sf_readf_float (infile, input, BUFFER_LEN / channels) ; + src_data.data_in = input ; + + /* The last read will not be a full buffer, so snd_of_input. */ + if (src_data.input_frames < BUFFER_LEN / channels) + src_data.end_of_input = SF_TRUE ; + } ; + + if ((error = src_process (src_state, &src_data))) + { printf ("\nError : %s\n", src_strerror (error)) ; + exit (1) ; + } ; + + /* Terminate if done. */ + if (src_data.end_of_input && src_data.output_frames_gen == 0) + break ; + + max = apply_gain (src_data.data_out, src_data.output_frames_gen, channels, max, *gain) ; + + /* Write output. */ + sf_writef_float (outfile, output, src_data.output_frames_gen) ; + output_count += src_data.output_frames_gen ; + + src_data.data_in += src_data.input_frames_used * channels ; + src_data.input_frames -= src_data.input_frames_used ; + } ; + + src_delete (src_state) ; + + if (normalize && max > 1.0) + { *gain = 1.0 / max ; + printf ("\nOutput has clipped. Restarting conversion to prevent clipping.\n\n") ; + return -1 ; + } ; + + return output_count ; +} /* sample_rate_convert */ + +static double +apply_gain (float * data, long frames, int channels, double max, double gain) +{ + long k ; + + for (k = 0 ; k < frames * channels ; k++) + { data [k] *= gain ; + + if (fabs (data [k]) > max) + max = fabs (data [k]) ; + } ; + + return max ; +} /* apply_gain */ + +static void +usage_exit (const char *progname) +{ char lsf_ver [128] ; + const char *cptr ; + int k ; + + if ((cptr = strrchr (progname, '/')) != NULL) + progname = cptr + 1 ; + + if ((cptr = strrchr (progname, '\\')) != NULL) + progname = cptr + 1 ; + + + sf_command (NULL, SFC_GET_LIB_VERSION, lsf_ver, sizeof (lsf_ver)) ; + + printf ("\n" + " A Sample Rate Converter using libsndfile for file I/O and Secret \n" + " Rabbit Code (aka libsamplerate) for performing the conversion.\n" + " It works on any file format supported by libsndfile with any \n" + " number of channels (limited only by host memory).\n" + "\n" + " %s\n" + " %s\n" + "\n" + " Usage : \n" + " %s -to [-c ] \n" + " %s -by [-c ] \n" + "\n", src_get_version (), lsf_ver, progname, progname) ; + + puts ( + " The optional -c argument allows the converter type to be chosen from\n" + " the following list :" + "\n" + ) ; + + for (k = 0 ; (cptr = src_get_name (k)) != NULL ; k++) + printf (" %d : %s%s\n", k, cptr, k == DEFAULT_CONVERTER ? " (default)" : "") ; + + puts ("\n" + " The --no-normalize option disables clipping check and normalization.") ; + + puts ("") ; + + exit (1) ; +} /* usage_exit */ + +/*============================================================================== +*/ + +#else /* (HAVE_SNFILE == 0) */ + +/* Alternative main function when libsndfile is not available. */ + +int +main (void) +{ puts ( + "\n" + "****************************************************************\n" + " This example program was compiled without libsndfile \n" + " (http://www.mega-nerd.com/libsndfile/).\n" + " It is therefore completely broken and non-functional.\n" + "****************************************************************\n" + "\n" + ) ; + + return 0 ; +} /* main */ + +#endif +