ref: 709b0069c55ac1f3b073f9b5dd475a07f6eabb8e
dir: /examples/timewarp-file.c/
/* ** Copyright (C) 2005 Erik de Castro Lopo <[email protected]> ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by ** the Free Software Foundation; either version 2 of the License, or ** (at your option) any later version. ** ** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** GNU General Public License for more details. ** ** You should have received a copy of the GNU General Public License ** along with this program; if not, write to the Free Software ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. */ #include "config.h" #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <math.h> #if (HAVE_SNDFILE) #include <samplerate.h> #include <sndfile.h> #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_state = 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 <input file> <output file>\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 /* ** Do not edit or modify anything in this comment block. ** The arch-tag line is a file identity tag for the GNU Arch ** revision control system. ** ** arch-tag: 0c461ce0-44a6-4f5e-9187-b5ce24cd46e0 */