Jack2  1.9.8
JackLibSampleRateResampler.cpp
00001 /*
00002 Copyright (C) 2008 Grame
00003 
00004 This program is free software; you can redistribute it and/or modify
00005 it under the terms of the GNU General Public License as published by
00006 the Free Software Foundation; either version 2 of the License, or
00007 (at your option) any later version.
00008 
00009 This program is distributed in the hope that it will be useful,
00010 but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 GNU General Public License for more details.
00013 
00014 You should have received a copy of the GNU General Public License
00015 along with this program; if not, write to the Free Software
00016 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 
00018 */
00019 
00020 #include "JackLibSampleRateResampler.h"
00021 
00022 namespace Jack
00023 {
00024 
00025 JackLibSampleRateResampler::JackLibSampleRateResampler()
00026     :JackResampler()
00027 {
00028     int error;
00029     fResampler = src_new(SRC_LINEAR, 1, &error);
00030     if (error != 0)
00031         jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
00032 }
00033 
00034 JackLibSampleRateResampler::JackLibSampleRateResampler(unsigned int quality)
00035     :JackResampler()
00036 {
00037      switch (quality) {
00038        case 0:
00039             quality = SRC_LINEAR;
00040             break;
00041         case 1:
00042             quality = SRC_ZERO_ORDER_HOLD;
00043             break;
00044         case 2:
00045             quality = SRC_SINC_FASTEST;
00046             break;
00047         case 3:
00048             quality = SRC_SINC_MEDIUM_QUALITY;
00049             break;
00050         case 4:
00051             quality = SRC_SINC_BEST_QUALITY;
00052             break;
00053         default:
00054             quality = SRC_LINEAR;
00055             jack_error("Out of range resample quality");
00056             break;
00057     }
00058 
00059     int error;
00060     fResampler = src_new(quality, 1, &error);
00061     if (error != 0) {
00062         jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
00063     }
00064 }
00065 
00066 JackLibSampleRateResampler::~JackLibSampleRateResampler()
00067 {
00068     src_delete(fResampler);
00069 }
00070 
00071 void JackLibSampleRateResampler::Reset(unsigned int new_size)
00072 {
00073     JackResampler::Reset(new_size);
00074     src_reset(fResampler);
00075 }
00076 
00077 unsigned int JackLibSampleRateResampler::ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames)
00078 {
00079     jack_ringbuffer_data_t ring_buffer_data[2];
00080     SRC_DATA src_data;
00081     unsigned int frames_to_write = frames;
00082     unsigned int written_frames = 0;
00083     int res;
00084 
00085     jack_ringbuffer_get_read_vector(fRingBuffer, ring_buffer_data);
00086     unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
00087     jack_log("Output available = %ld", available_frames);
00088 
00089     for (int j = 0; j < 2; j++) {
00090 
00091         if (ring_buffer_data[j].len > 0) {
00092 
00093             src_data.data_in = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
00094             src_data.data_out = &buffer[written_frames];
00095             src_data.input_frames = ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t);
00096             src_data.output_frames = frames_to_write;
00097             src_data.end_of_input = 0;
00098             src_data.src_ratio = fRatio;
00099 
00100             res = src_process(fResampler, &src_data);
00101             if (res != 0) {
00102                 jack_error("JackLibSampleRateResampler::ReadResample ratio = %f err = %s", fRatio, src_strerror(res));
00103                 return 0;
00104             }
00105 
00106             frames_to_write -= src_data.output_frames_gen;
00107             written_frames += src_data.output_frames_gen;
00108 
00109             if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
00110                 jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
00111                     , j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
00112             }
00113 
00114             jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
00115             jack_ringbuffer_read_advance(fRingBuffer, src_data.input_frames_used * sizeof(jack_default_audio_sample_t));
00116         }
00117     }
00118 
00119     if (written_frames < frames) {
00120         jack_error("Output available = %ld", available_frames);
00121         jack_error("JackLibSampleRateResampler::ReadResample error written_frames = %ld", written_frames);
00122     }
00123 
00124     return written_frames;
00125 }
00126 
00127 unsigned int JackLibSampleRateResampler::WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames)
00128 {
00129     jack_ringbuffer_data_t ring_buffer_data[2];
00130     SRC_DATA src_data;
00131     unsigned int frames_to_read = frames;
00132     unsigned int read_frames = 0;
00133     int res;
00134 
00135     jack_ringbuffer_get_write_vector(fRingBuffer, ring_buffer_data);
00136     unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
00137     jack_log("Input available = %ld", available_frames);
00138 
00139     for (int j = 0; j < 2; j++) {
00140 
00141         if (ring_buffer_data[j].len > 0) {
00142 
00143             src_data.data_in = &buffer[read_frames];
00144             src_data.data_out = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
00145             src_data.input_frames = frames_to_read;
00146             src_data.output_frames = (ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t));
00147             src_data.end_of_input = 0;
00148             src_data.src_ratio = fRatio;
00149 
00150             res = src_process(fResampler, &src_data);
00151             if (res != 0) {
00152                 jack_error("JackLibSampleRateResampler::WriteResample ratio = %f err = %s", fRatio, src_strerror(res));
00153                 return 0;
00154             }
00155 
00156             frames_to_read -= src_data.input_frames_used;
00157             read_frames += src_data.input_frames_used;
00158 
00159             if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
00160                 jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
00161                     , j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
00162             }
00163 
00164             jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
00165             jack_ringbuffer_write_advance(fRingBuffer, src_data.output_frames_gen * sizeof(jack_default_audio_sample_t));
00166         }
00167     }
00168 
00169     if (read_frames < frames) {
00170         jack_error("Input available = %ld", available_frames);
00171         jack_error("JackLibSampleRateResampler::WriteResample error read_frames = %ld", read_frames);
00172     }
00173 
00174     return read_frames;
00175 }
00176 
00177 }