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path: root/libavfilter/af_rubberband.c (plain)
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1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include <rubberband/rubberband-c.h>
20
21#include "libavutil/channel_layout.h"
22#include "libavutil/common.h"
23#include "libavutil/opt.h"
24
25#include "audio.h"
26#include "avfilter.h"
27#include "formats.h"
28#include "internal.h"
29
30typedef struct RubberBandContext {
31 const AVClass *class;
32 RubberBandState rbs;
33
34 double tempo, pitch;
35 int transients, detector, phase, window,
36 smoothing, formant, opitch, channels;
37 int64_t nb_samples_out;
38 int64_t nb_samples_in;
39 int flushed;
40} RubberBandContext;
41
42#define OFFSET(x) offsetof(RubberBandContext, x)
43#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
44
45static const AVOption rubberband_options[] = {
46 { "tempo", "set tempo scale factor", OFFSET(tempo), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.01, 100, A },
47 { "pitch", "set pitch scale factor", OFFSET(pitch), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.01, 100, A },
48 { "transients", "set transients", OFFSET(transients), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "transients" },
49 { "crisp", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionTransientsCrisp}, 0, 0, A, "transients" },
50 { "mixed", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionTransientsMixed}, 0, 0, A, "transients" },
51 { "smooth", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionTransientsSmooth}, 0, 0, A, "transients" },
52 { "detector", "set detector", OFFSET(detector), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "detector" },
53 { "compound", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionDetectorCompound}, 0, 0, A, "detector" },
54 { "percussive", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionDetectorPercussive}, 0, 0, A, "detector" },
55 { "soft", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionDetectorSoft}, 0, 0, A, "detector" },
56 { "phase", "set phase", OFFSET(phase), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "phase" },
57 { "laminar", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPhaseLaminar}, 0, 0, A, "phase" },
58 { "independent", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPhaseIndependent}, 0, 0, A, "phase" },
59 { "window", "set window", OFFSET(window), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "window" },
60 { "standard", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionWindowStandard}, 0, 0, A, "window" },
61 { "short", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionWindowShort}, 0, 0, A, "window" },
62 { "long", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionWindowLong}, 0, 0, A, "window" },
63 { "smoothing", "set smoothing", OFFSET(smoothing), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "smoothing" },
64 { "off", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionSmoothingOff}, 0, 0, A, "smoothing" },
65 { "on", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionSmoothingOn}, 0, 0, A, "smoothing" },
66 { "formant", "set formant", OFFSET(formant), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "formant" },
67 { "shifted", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionFormantShifted}, 0, 0, A, "formant" },
68 { "preserved", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionFormantPreserved}, 0, 0, A, "formant" },
69 { "pitchq", "set pitch quality", OFFSET(opitch), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "pitch" },
70 { "quality", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPitchHighQuality}, 0, 0, A, "pitch" },
71 { "speed", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPitchHighSpeed}, 0, 0, A, "pitch" },
72 { "consistency", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPitchHighConsistency}, 0, 0, A, "pitch" },
73 { "channels", "set channels", OFFSET(channels), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "channels" },
74 { "apart", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionChannelsApart}, 0, 0, A, "channels" },
75 { "together", 0, 0, AV_OPT_TYPE_CONST, {.i64=RubberBandOptionChannelsTogether}, 0, 0, A, "channels" },
76 { NULL },
77};
78
79AVFILTER_DEFINE_CLASS(rubberband);
80
81static av_cold void uninit(AVFilterContext *ctx)
82{
83 RubberBandContext *s = ctx->priv;
84
85 if (s->rbs)
86 rubberband_delete(s->rbs);
87}
88
89static int query_formats(AVFilterContext *ctx)
90{
91 AVFilterFormats *formats = NULL;
92 AVFilterChannelLayouts *layouts = NULL;
93 static const enum AVSampleFormat sample_fmts[] = {
94 AV_SAMPLE_FMT_FLTP,
95 AV_SAMPLE_FMT_NONE,
96 };
97 int ret;
98
99 layouts = ff_all_channel_counts();
100 if (!layouts)
101 return AVERROR(ENOMEM);
102 ret = ff_set_common_channel_layouts(ctx, layouts);
103 if (ret < 0)
104 return ret;
105
106 formats = ff_make_format_list(sample_fmts);
107 if (!formats)
108 return AVERROR(ENOMEM);
109 ret = ff_set_common_formats(ctx, formats);
110 if (ret < 0)
111 return ret;
112
113 formats = ff_all_samplerates();
114 if (!formats)
115 return AVERROR(ENOMEM);
116 return ff_set_common_samplerates(ctx, formats);
117}
118
119static int filter_frame(AVFilterLink *inlink, AVFrame *in)
120{
121 RubberBandContext *s = inlink->dst->priv;
122 AVFilterLink *outlink = inlink->dst->outputs[0];
123 AVFrame *out;
124 int ret = 0, nb_samples;
125
126 rubberband_process(s->rbs, (const float *const *)in->data, in->nb_samples, 0);
127 s->nb_samples_in += in->nb_samples;
128
129 nb_samples = rubberband_available(s->rbs);
130 if (nb_samples > 0) {
131 out = ff_get_audio_buffer(inlink, nb_samples);
132 if (!out) {
133 av_frame_free(&in);
134 return AVERROR(ENOMEM);
135 }
136 out->pts = av_rescale_q(s->nb_samples_out,
137 (AVRational){ 1, outlink->sample_rate },
138 outlink->time_base);
139 nb_samples = rubberband_retrieve(s->rbs, (float *const *)out->data, nb_samples);
140 out->nb_samples = nb_samples;
141 ret = ff_filter_frame(outlink, out);
142 s->nb_samples_out += nb_samples;
143 }
144
145 av_frame_free(&in);
146 return ret;
147}
148
149static int config_input(AVFilterLink *inlink)
150{
151 AVFilterContext *ctx = inlink->dst;
152 RubberBandContext *s = ctx->priv;
153 int opts = s->transients|s->detector|s->phase|s->window|
154 s->smoothing|s->formant|s->opitch|s->channels|
155 RubberBandOptionProcessRealTime;
156
157 if (s->rbs)
158 rubberband_delete(s->rbs);
159 s->rbs = rubberband_new(inlink->sample_rate, inlink->channels, opts, 1. / s->tempo, s->pitch);
160
161 inlink->partial_buf_size =
162 inlink->min_samples =
163 inlink->max_samples = rubberband_get_samples_required(s->rbs);
164
165 return 0;
166}
167
168static int request_frame(AVFilterLink *outlink)
169{
170 AVFilterContext *ctx = outlink->src;
171 RubberBandContext *s = ctx->priv;
172 AVFilterLink *inlink = ctx->inputs[0];
173 int ret = 0;
174
175 ret = ff_request_frame(ctx->inputs[0]);
176
177 if (ret == AVERROR_EOF && !s->flushed) {
178 if (rubberband_available(s->rbs) > 0) {
179 AVFrame *out = ff_get_audio_buffer(inlink, 1);
180 int nb_samples;
181
182 if (!out)
183 return AVERROR(ENOMEM);
184
185 rubberband_process(s->rbs, (const float *const *)out->data, 1, 1);
186 av_frame_free(&out);
187 nb_samples = rubberband_available(s->rbs);
188
189 if (nb_samples > 0) {
190 out = ff_get_audio_buffer(inlink, nb_samples);
191 if (!out)
192 return AVERROR(ENOMEM);
193 out->pts = av_rescale_q(s->nb_samples_out,
194 (AVRational){ 1, outlink->sample_rate },
195 outlink->time_base);
196 nb_samples = rubberband_retrieve(s->rbs, (float *const *)out->data, nb_samples);
197 out->nb_samples = nb_samples;
198 ret = ff_filter_frame(outlink, out);
199 s->nb_samples_out += nb_samples;
200 }
201 }
202 s->flushed = 1;
203 av_log(ctx, AV_LOG_DEBUG, "nb_samples_in %"PRId64" nb_samples_out %"PRId64"\n",
204 s->nb_samples_in, s->nb_samples_out);
205 }
206
207 return ret;
208}
209
210static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
211 char *res, int res_len, int flags)
212{
213 RubberBandContext *s = ctx->priv;
214
215 if (!strcmp(cmd, "tempo")) {
216 double arg;
217
218 sscanf(args, "%lf", &arg);
219 if (arg < 0.01 || arg > 100) {
220 av_log(ctx, AV_LOG_ERROR,
221 "Tempo scale factor '%f' out of range\n", arg);
222 return AVERROR(EINVAL);
223 }
224 rubberband_set_time_ratio(s->rbs, 1. / arg);
225 }
226
227 if (!strcmp(cmd, "pitch")) {
228 double arg;
229
230 sscanf(args, "%lf", &arg);
231 if (arg < 0.01 || arg > 100) {
232 av_log(ctx, AV_LOG_ERROR,
233 "Pitch scale factor '%f' out of range\n", arg);
234 return AVERROR(EINVAL);
235 }
236 rubberband_set_pitch_scale(s->rbs, arg);
237 }
238
239 return 0;
240}
241
242static const AVFilterPad rubberband_inputs[] = {
243 {
244 .name = "default",
245 .type = AVMEDIA_TYPE_AUDIO,
246 .config_props = config_input,
247 .filter_frame = filter_frame,
248 },
249 { NULL }
250};
251
252static const AVFilterPad rubberband_outputs[] = {
253 {
254 .name = "default",
255 .type = AVMEDIA_TYPE_AUDIO,
256 .request_frame = request_frame,
257 },
258 { NULL }
259};
260
261AVFilter ff_af_rubberband = {
262 .name = "rubberband",
263 .description = NULL_IF_CONFIG_SMALL("Apply time-stretching and pitch-shifting."),
264 .query_formats = query_formats,
265 .priv_size = sizeof(RubberBandContext),
266 .priv_class = &rubberband_class,
267 .uninit = uninit,
268 .inputs = rubberband_inputs,
269 .outputs = rubberband_outputs,
270 .process_command = process_command,
271};
272
generated by cgit at 2024-05-17 05:45:49 (GMT)