1 /* Copyright (C) 2012 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file resample_filter.c A sample rate converter based on libsamplerate. */
6 #include <samplerate.h>
9 #include "filter_cmd.lsg.h"
14 #include "buffer_tree.h"
17 #include "check_wav.h"
19 #define U32_OPTVAL(_opt, _lpr) (FILTER_CMD_OPT_UINT32_VAL(RESAMPLE, _opt, _lpr))
20 #define OPT_GIVEN(_opt, _lpr) (FILTER_CMD_OPT_GIVEN(RESAMPLE, _opt, _lpr))
22 /* effective values, may differ from config arg */
23 struct resample_context {
25 int source_sample_rate;
28 struct check_wav_context *cwc;
31 static int resample_execute(struct btr_node *btrn, const char *cmd, char **result)
33 struct filter_node *fn = btr_context(btrn);
34 struct resample_context *ctx = fn->private_data;
35 uint32_t dsr = U32_OPTVAL(DEST_SAMPLE_RATE, fn->lpr);
36 return decoder_execute(cmd, dsr, ctx->channels, result);
39 static void resample_close(struct filter_node *fn)
41 struct resample_context *ctx = fn->private_data;
45 check_wav_shutdown(ctx->cwc);
47 src_delete(ctx->src_state);
49 fn->private_data = NULL;
52 static void resample_open(struct filter_node *fn)
54 struct resample_context *ctx = para_calloc(sizeof(*ctx));
55 struct btr_node *btrn = fn->btrn;
58 fn->private_data = ctx;
60 LLS_COPY_WAV_PARMS(&wp, LSG_FILTER_CMD_RESAMPLE, fn->lpr);
61 ctx->cwc = check_wav_init(btr_parent(btrn), btrn, &wp, NULL);
62 btr_log_tree(btr_parent(btr_parent(btrn)), LL_INFO);
65 static void resample_pre_select(struct sched *s, void *context)
67 struct filter_node *fn = context;
68 struct resample_context *ctx = fn->private_data;
69 int ret = btr_node_status(fn->btrn, fn->min_iqs, BTR_NT_INTERNAL);
72 return sched_min_delay(s);
73 check_wav_pre_select(s, ctx->cwc);
76 static int get_btr_val(const char *what, struct btr_node *btrn)
80 int ret = btr_exec_up(btr_parent(btrn), what, &buf);
83 PARA_NOTICE_LOG("btr exec for \"%s\" failed\n", what);
86 ret = para_atoi32(buf, &val);
88 return ret < 0? ret : val;
91 static int resample_set_params(struct filter_node *fn)
94 struct resample_context *ctx = fn->private_data;
95 struct btr_node *btrn = fn->btrn;
96 struct lls_parse_result *lpr = fn->lpr;
98 ctx->channels = U32_OPTVAL(CHANNELS, lpr);
99 if (!OPT_GIVEN(CHANNELS, lpr)) {
100 ret = get_btr_val("channels", btrn);
104 ctx->source_sample_rate = U32_OPTVAL(SAMPLE_RATE, lpr);
105 if (!OPT_GIVEN(SAMPLE_RATE, lpr)) {
106 ret = get_btr_val("sample_rate", btrn);
108 ctx->source_sample_rate = ret;
110 /* reject all sample formats except 16 bit signed, little endian */
111 ret = get_btr_val("sample_format", btrn);
112 if (ret >= 0 && ret != SF_S16_LE) {
113 const char * const sample_formats[] = {SAMPLE_FORMATS};
114 PARA_ERROR_LOG("unsupported sample format: %s\n",
115 sample_formats[ret]);
116 return -ERRNO_TO_PARA_ERROR(EINVAL);
118 ctx->ratio = U32_OPTVAL(DEST_SAMPLE_RATE, lpr)
119 / (float)ctx->source_sample_rate;
123 static int resample_init(struct filter_node *fn)
126 const uint32_t trafo[] = {
127 [RCT_BEST] = SRC_SINC_BEST_QUALITY,
128 [RCT_MEDIUM] = SRC_SINC_MEDIUM_QUALITY,
129 [RCT_FASTEST] = SRC_SINC_FASTEST,
130 [RCT_ZERO_ORDER_HOLD] = SRC_ZERO_ORDER_HOLD,
131 [RCT_LINEAR] = SRC_LINEAR
133 struct resample_context *ctx = fn->private_data;
134 const struct lls_option *o_c = FILTER_CMD_OPT(RESAMPLE, CONVERTER);
135 uint32_t converter = U32_OPTVAL(CONVERTER, fn->lpr);
137 PARA_INFO_LOG("converter type: %s\n",
138 lls_enum_string_val(converter, o_c));
139 ret = resample_set_params(fn);
142 ctx->src_state = src_new(trafo[converter],
143 U32_OPTVAL(CHANNELS, fn->lpr), &ret);
144 if (!ctx->src_state) {
145 PARA_ERROR_LOG("%s\n", src_strerror(ret));
146 return -E_LIBSAMPLERATE;
148 fn->min_iqs = 2 * ctx->channels;
152 /* returns number of input frames used */
153 static int resample_frames(int16_t *in, size_t num_frames, bool have_more,
154 struct resample_context *ctx, int16_t **result,
155 size_t *result_frames)
157 int ret, num_samples, out_samples;
162 data.src_ratio = ctx->ratio;
163 data.end_of_input = !have_more;
165 data.input_frames = num_frames;
166 num_samples = num_frames * ctx->channels;
167 data.output_frames = num_frames * ctx->ratio + 1;
168 out_samples = data.output_frames * ctx->channels;
170 in_float = para_malloc(num_samples * sizeof(float));
171 src_short_to_float_array(in, in_float, num_samples);
172 data.data_in = in_float;
173 data.data_out = para_malloc(out_samples * sizeof(float));
174 ret = src_process(ctx->src_state, &data);
177 PARA_ERROR_LOG("%s\n", src_strerror(ret));
179 return -E_LIBSAMPLERATE;
181 out_samples = data.output_frames_gen * ctx->channels;
182 out = para_malloc(out_samples * sizeof(short));
183 src_float_to_short_array(data.data_out, out, out_samples);
186 *result_frames = data.output_frames_gen;
187 return data.input_frames_used;
190 static int resample_post_select(__a_unused struct sched *s, void *context)
193 struct filter_node *fn = context;
194 struct resample_context *ctx = fn->private_data;
195 struct btr_node *btrn = fn->btrn;
197 size_t in_bytes, num_frames;
200 ret = check_wav_post_select(ctx->cwc);
203 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
206 if (!ctx->src_state) {
207 ret = resample_init(fn);
211 if (ctx->source_sample_rate == U32_OPTVAL(DEST_SAMPLE_RATE, fn->lpr)) {
213 * No resampling necessary. We do not splice ourselves out
214 * though, since our children might want to ask us through the
215 * btr exec mechanism for the destination samplerate and the
221 btr_merge(btrn, fn->min_iqs);
222 in_bytes = btr_next_buffer(btrn, (char **)&in);
223 ret = -E_RESAMPLE_EOF;
224 num_frames = in_bytes / 2 / ctx->channels;
227 have_more = !btr_no_parent(btrn) ||
228 btr_next_buffer_omit(btrn, in_bytes, NULL) > 0;
229 ret = resample_frames(in, num_frames, have_more, ctx, &out, &num_frames);
232 btr_consume(btrn, ret * 2 * ctx->channels);
233 btr_add_output((char *)out, num_frames * 2 * ctx->channels, btrn);
237 btr_remove_node(&fn->btrn);
238 /* This releases the check_wav btr node */
239 check_wav_post_select(ctx->cwc);
244 static void *resample_setup(const struct lls_parse_result *lpr)
250 u32 = U32_OPTVAL(CHANNELS, lpr);
251 given = OPT_GIVEN(CHANNELS, lpr);
252 if (u32 == 0 && given) {
253 PARA_EMERG_LOG("fatal: zero channels?!\n");
256 u32 = U32_OPTVAL(SAMPLE_RATE, lpr);
257 given = OPT_GIVEN(SAMPLE_RATE, lpr);
258 if (u32 == 0 && given) {
259 PARA_EMERG_LOG("fatal: input sample rate can not be 0\n");
262 u32 = U32_OPTVAL(DEST_SAMPLE_RATE, lpr);
263 given = OPT_GIVEN(DEST_SAMPLE_RATE, lpr);
264 if (u32 == 0 && given) {
265 PARA_EMERG_LOG("fatal: destination sample rate can not be 0\n");
271 static void resample_teardown(__a_unused const struct lls_parse_result *lpr,
277 const struct filter lsg_filter_cmd_com_resample_user_data = {
278 .setup = resample_setup,
279 .open = resample_open,
280 .pre_select = resample_pre_select,
281 .post_select = resample_post_select,
282 .close = resample_close,
283 .teardown = resample_teardown,
284 .execute = resample_execute