X-Git-Url: http://git.ieval.ro/?a=blobdiff_plain;f=libsamplerate%2Fexamples%2Ftimewarp-file.c;fp=libsamplerate%2Fexamples%2Ftimewarp-file.c;h=f0f61c496005e91d2d8111d69e0c34cd48a74505;hb=8529da432e52c7903e8ef3488e60725a099e6e63;hp=0000000000000000000000000000000000000000;hpb=27013d8f68878b8ed2d3f747e26f562d08d7d678;p=audio-libsamplerate.git diff --git a/libsamplerate/examples/timewarp-file.c b/libsamplerate/examples/timewarp-file.c new file mode 100644 index 0000000..f0f61c4 --- /dev/null +++ b/libsamplerate/examples/timewarp-file.c @@ -0,0 +1,230 @@ +/* +** Copyright (c) 2005-2016, 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 ARRAY_LEN(x) ((int) (sizeof (x) / sizeof ((x) [0]))) + +#define DEFAULT_CONVERTER SRC_SINC_MEDIUM_QUALITY + +#define BUFFER_LEN 1024 +#define INPUT_STEP_SIZE 8 + +typedef struct +{ sf_count_t index ; + double ratio ; +} TIMEWARP_FACTOR ; + +static void usage_exit (const char *progname) ; +static sf_count_t timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels) ; + +int +main (int argc, char *argv []) +{ SNDFILE *infile, *outfile ; + SF_INFO sfinfo ; + sf_count_t count ; + + if (argc != 3) + usage_exit (argv [0]) ; + + putchar ('\n') ; + printf ("Input File : %s\n", argv [argc - 2]) ; + 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) ; + } ; + + if (INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN) + { printf ("\n\nError : INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN\n\n") ; + exit (1) ; + } ; + + + /* Delete the output file length to zero if already exists. */ + remove (argv [argc - 1]) ; + + 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) ; + } ; + + sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ; + + printf ("Output file : %s\n", argv [argc - 1]) ; + printf ("Converter : %s\n", src_get_name (DEFAULT_CONVERTER)) ; + + count = timewarp_convert (infile, outfile, DEFAULT_CONVERTER, sfinfo.channels) ; + + printf ("Output Frames : %ld\n\n", (long) count) ; + + sf_close (infile) ; + sf_close (outfile) ; + + return 0 ; +} /* main */ + +/*============================================================================== +*/ + +static TIMEWARP_FACTOR warp [] = +{ { 0 , 1.00000001 }, + { 20000 , 1.01000000 }, + { 20200 , 1.00000001 }, + { 40000 , 1.20000000 }, + { 40300 , 1.00000001 }, + { 60000 , 1.10000000 }, + { 60400 , 1.00000001 }, + { 80000 , 1.50000000 }, + { 81000 , 1.00000001 }, +} ; + +static sf_count_t +timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels) +{ static float input [BUFFER_LEN] ; + static float output [BUFFER_LEN] ; + + SRC_STATE *src_state ; + SRC_DATA src_data ; + int error, warp_index = 0 ; + sf_count_t input_count = 0, 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 ; + + if (warp [0].index > 0) + src_data.src_ratio = 1.0 ; + else + { src_data.src_ratio = warp [0].ratio ; + warp_index ++ ; + } ; + + src_data.data_out = output ; + src_data.output_frames = BUFFER_LEN /channels ; + + while (1) + { + if (warp_index < ARRAY_LEN (warp) - 1 && input_count >= warp [warp_index].index) + { src_data.src_ratio = warp [warp_index].ratio ; + warp_index ++ ; + } ; + + /* If the input buffer is empty, refill it. */ + if (src_data.input_frames == 0) + { src_data.input_frames = sf_readf_float (infile, input, INPUT_STEP_SIZE) ; + input_count += src_data.input_frames ; + src_data.data_in = input ; + + /* The last read will not be a full buffer, so snd_of_input. */ + if (src_data.input_frames < INPUT_STEP_SIZE) + src_data.end_of_input = SF_TRUE ; + } ; + + /* Process current block. */ + 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 ; + + /* 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) ; + + return output_count ; +} /* timewarp_convert */ + +/*------------------------------------------------------------------------------ +*/ + +static void +usage_exit (const char *progname) +{ const char *cptr ; + + if ((cptr = strrchr (progname, '/')) != NULL) + progname = cptr + 1 ; + + if ((cptr = strrchr (progname, '\\')) != NULL) + progname = cptr + 1 ; + + printf ("\n" + " A program demonstrating the time warping capabilities of libsamplerate." + " It uses libsndfile for file I/O and Secret Rabbit Code (aka libsamplerate)" + " for performing the warping.\n" + " It works on any file format supported by libsndfile with any \n" + " number of channels (limited only by host memory).\n" + "\n" + " The warping is dependant on a table hard code into the source code.\n" + "\n" + " libsamplerate version : %s\n" + "\n" + " Usage : \n" + " %s \n" + "\n", src_get_version (), progname) ; + + 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 +