Alexandre Lision | 8af73cb | 2013-12-10 14:11:20 -0500 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pjmedia/resample.h> |
| 21 | #include <pjmedia/errno.h> |
| 22 | #include <pj/assert.h> |
| 23 | #include <pj/log.h> |
| 24 | #include <pj/pool.h> |
| 25 | |
| 26 | /* |
| 27 | * HOW TO ACTIVATE LIBSAMPLERATE (a.k.a SRC/Secret Rabbit Code) AS |
| 28 | * PJMEDIA'S SAMPLE RATE CONVERSION BACKEND |
| 29 | * |
| 30 | * See README.txt in third_party/samplerate directory. |
| 31 | */ |
| 32 | |
| 33 | |
| 34 | #if PJMEDIA_RESAMPLE_IMP==PJMEDIA_RESAMPLE_LIBSAMPLERATE |
| 35 | |
| 36 | #include "../../third_party/libsamplerate/src/samplerate.h" |
| 37 | |
| 38 | #define THIS_FILE "resample_libsamplerate.c" |
| 39 | |
| 40 | #if defined(_MSC_VER) |
| 41 | # ifdef _DEBUG |
| 42 | # pragma comment( lib, "../../third_party/lib/libsamplerate-i386-win32-vc-debug.lib") |
| 43 | # else |
| 44 | # pragma comment( lib, "../../third_party/lib/libsamplerate-i386-win32-vc-release.lib") |
| 45 | # endif |
| 46 | #endif |
| 47 | |
| 48 | |
| 49 | struct pjmedia_resample |
| 50 | { |
| 51 | SRC_STATE *state; |
| 52 | unsigned in_samples; |
| 53 | unsigned out_samples; |
| 54 | float *frame_in, *frame_out; |
| 55 | unsigned in_extra, out_extra; |
| 56 | double ratio; |
| 57 | }; |
| 58 | |
| 59 | |
| 60 | PJ_DEF(pj_status_t) pjmedia_resample_create( pj_pool_t *pool, |
| 61 | pj_bool_t high_quality, |
| 62 | pj_bool_t large_filter, |
| 63 | unsigned channel_count, |
| 64 | unsigned rate_in, |
| 65 | unsigned rate_out, |
| 66 | unsigned samples_per_frame, |
| 67 | pjmedia_resample **p_resample) |
| 68 | { |
| 69 | pjmedia_resample *resample; |
| 70 | int type, err; |
| 71 | |
| 72 | PJ_ASSERT_RETURN(pool && p_resample && rate_in && |
| 73 | rate_out && samples_per_frame, PJ_EINVAL); |
| 74 | |
| 75 | resample = PJ_POOL_ZALLOC_T(pool, pjmedia_resample); |
| 76 | PJ_ASSERT_RETURN(resample, PJ_ENOMEM); |
| 77 | |
| 78 | /* Select conversion type */ |
| 79 | if (high_quality) { |
| 80 | type = large_filter ? SRC_SINC_BEST_QUALITY : SRC_SINC_MEDIUM_QUALITY; |
| 81 | } else { |
| 82 | type = large_filter ? SRC_SINC_FASTEST : SRC_LINEAR; |
| 83 | } |
| 84 | |
| 85 | /* Create converter */ |
| 86 | resample->state = src_new(type, channel_count, &err); |
| 87 | if (resample->state == NULL) { |
| 88 | PJ_LOG(4,(THIS_FILE, "Error creating resample: %s", |
| 89 | src_strerror(err))); |
| 90 | return PJMEDIA_ERROR; |
| 91 | } |
| 92 | |
| 93 | /* Calculate ratio */ |
| 94 | resample->ratio = rate_out * 1.0 / rate_in; |
| 95 | |
| 96 | /* Calculate number of samples for input and output */ |
| 97 | resample->in_samples = samples_per_frame; |
| 98 | resample->out_samples = rate_out / (rate_in / samples_per_frame); |
| 99 | |
| 100 | resample->frame_in = (float*) |
| 101 | pj_pool_calloc(pool, |
| 102 | resample->in_samples + 8, |
| 103 | sizeof(float)); |
| 104 | |
| 105 | resample->frame_out = (float*) |
| 106 | pj_pool_calloc(pool, |
| 107 | resample->out_samples + 8, |
| 108 | sizeof(float)); |
| 109 | |
| 110 | /* Set the converter ratio */ |
| 111 | err = src_set_ratio(resample->state, resample->ratio); |
| 112 | if (err != 0) { |
| 113 | PJ_LOG(4,(THIS_FILE, "Error creating resample: %s", |
| 114 | src_strerror(err))); |
| 115 | return PJMEDIA_ERROR; |
| 116 | } |
| 117 | |
| 118 | /* Done */ |
| 119 | |
| 120 | PJ_LOG(5,(THIS_FILE, |
| 121 | "Resample using libsamplerate %s, type=%s (%s), " |
| 122 | "ch=%d, in/out rate=%d/%d", |
| 123 | src_get_version(), |
| 124 | src_get_name(type), src_get_description(type), |
| 125 | channel_count, rate_in, rate_out)); |
| 126 | |
| 127 | *p_resample = resample; |
| 128 | |
| 129 | return PJ_SUCCESS; |
| 130 | } |
| 131 | |
| 132 | |
| 133 | PJ_DEF(void) pjmedia_resample_run( pjmedia_resample *resample, |
| 134 | const pj_int16_t *input, |
| 135 | pj_int16_t *output ) |
| 136 | { |
| 137 | SRC_DATA src_data; |
| 138 | |
| 139 | /* Convert samples to float */ |
| 140 | src_short_to_float_array(input, resample->frame_in, |
| 141 | resample->in_samples); |
| 142 | |
| 143 | if (resample->in_extra) { |
| 144 | unsigned i; |
| 145 | |
| 146 | for (i=0; i<resample->in_extra; ++i) |
| 147 | resample->frame_in[resample->in_samples+i] = |
| 148 | resample->frame_in[resample->in_samples-1]; |
| 149 | } |
| 150 | |
| 151 | /* Prepare SRC_DATA */ |
| 152 | pj_bzero(&src_data, sizeof(src_data)); |
| 153 | src_data.data_in = resample->frame_in; |
| 154 | src_data.data_out = resample->frame_out; |
| 155 | src_data.input_frames = resample->in_samples + resample->in_extra; |
| 156 | src_data.output_frames = resample->out_samples + resample->out_extra; |
| 157 | src_data.src_ratio = resample->ratio; |
| 158 | |
| 159 | /* Process! */ |
| 160 | src_process(resample->state, &src_data); |
| 161 | |
| 162 | /* Convert output back to short */ |
| 163 | src_float_to_short_array(resample->frame_out, output, |
| 164 | src_data.output_frames_gen); |
| 165 | |
| 166 | /* Replay last sample if conversion couldn't fill up the whole |
| 167 | * frame. This could happen for example with 22050 to 16000 conversion. |
| 168 | */ |
| 169 | if (src_data.output_frames_gen < (int)resample->out_samples) { |
| 170 | unsigned i; |
| 171 | |
| 172 | if (resample->in_extra < 4) |
| 173 | resample->in_extra++; |
| 174 | |
| 175 | for (i=src_data.output_frames_gen; |
| 176 | i<resample->out_samples; ++i) |
| 177 | { |
| 178 | output[i] = output[src_data.output_frames_gen-1]; |
| 179 | } |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | |
| 184 | PJ_DEF(unsigned) pjmedia_resample_get_input_size(pjmedia_resample *resample) |
| 185 | { |
| 186 | PJ_ASSERT_RETURN(resample != NULL, 0); |
| 187 | return resample->in_samples; |
| 188 | } |
| 189 | |
| 190 | |
| 191 | PJ_DEF(void) pjmedia_resample_destroy(pjmedia_resample *resample) |
| 192 | { |
| 193 | PJ_ASSERT_ON_FAIL(resample, return); |
| 194 | if (resample->state) { |
| 195 | src_delete(resample->state); |
| 196 | resample->state = NULL; |
| 197 | |
| 198 | PJ_LOG(5,(THIS_FILE, "Resample destroyed")); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | #else /* PJMEDIA_RESAMPLE_IMP==PJMEDIA_RESAMPLE_LIBSAMPLERATE */ |
| 203 | |
| 204 | int pjmedia_libsamplerate_excluded; |
| 205 | |
| 206 | #endif /* PJMEDIA_RESAMPLE_IMP==PJMEDIA_RESAMPLE_LIBSAMPLERATE */ |
| 207 | |