avfilter: add rubberband wrapper

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 236 insertions, 0 deletions

diff --git a/libavfilter/af_rubberband.c b/libavfilter/af_rubberband.c
new file mode 100644
index 0000000000..60e8d3c642
--- /dev/null
+++ b/libavfilter/af_rubberband.c
@@ -0,0 +1,236 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <rubberband/rubberband-c.h>
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+
+#include "audio.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+
+typedef struct RubberBandContext {
+    const AVClass *class;
+    RubberBandState rbs;
+
+    double tempo, pitch;
+    int transients, detector, phase, window,
+        smoothing, formant, opitch, channels;
+    int64_t nb_samples_out;
+    int64_t nb_samples_in;
+    int flushed;
+} RubberBandContext;
+
+#define OFFSET(x) offsetof(RubberBandContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption rubberband_options[] = {
+    { "tempo",      "set tempo scale factor", OFFSET(tempo), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.01, 100, A },
+    { "pitch",      "set pitch scale factor", OFFSET(pitch), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.01, 100, A },
+    { "transients", "set transients", OFFSET(transients), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "transients" },
+        { "crisp",  0,                0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionTransientsCrisp},  0, 0, A, "transients" },
+        { "mixed",  0,                0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionTransientsMixed},  0, 0, A, "transients" },
+        { "smooth", 0,                0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionTransientsSmooth}, 0, 0, A, "transients" },
+    { "detector",   "set detector",   OFFSET(detector),   AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "detector" },
+        { "compound",   0,            0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionDetectorCompound},   0, 0, A, "detector" },
+        { "percussive", 0,            0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionDetectorPercussive}, 0, 0, A, "detector" },
+        { "soft",       0,            0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionDetectorSoft},       0, 0, A, "detector" },
+    { "phase",      "set phase",      OFFSET(phase),      AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "phase" },
+        { "laminar",     0,           0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPhaseLaminar},     0, 0, A, "phase" },
+        { "independent", 0,           0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPhaseIndependent}, 0, 0, A, "phase" },
+    { "window",     "set window",     OFFSET(window),     AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "window" },
+        { "standard", 0,              0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionWindowStandard}, 0, 0, A, "window" },
+        { "short",    0,              0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionWindowShort},    0, 0, A, "window" },
+        { "long",     0,              0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionWindowLong},     0, 0, A, "window" },
+    { "smoothing",  "set smoothing",  OFFSET(smoothing),  AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "smoothing" },
+        { "off",    0,                0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionSmoothingOff}, 0, 0, A, "smoothing" },
+        { "on",     0,                0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionSmoothingOn},  0, 0, A, "smoothing" },
+    { "formant",    "set formant",    OFFSET(formant),    AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "formant" },
+        { "shifted",    0,            0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionFormantShifted},   0, 0, A, "formant" },
+        { "preserved",  0,            0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionFormantPreserved}, 0, 0, A, "formant" },
+    { "pitch",      "set pitch",      OFFSET(opitch),     AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "pitch" },
+        { "quality",     0,           0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPitchHighQuality},     0, 0, A, "pitch" },
+        { "speed",       0,           0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPitchHighSpeed},       0, 0, A, "pitch" },
+        { "consistency", 0,           0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionPitchHighConsistency}, 0, 0, A, "pitch" },
+    { "channels",   "set channels",   OFFSET(channels),   AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, A, "channels" },
+        { "apart",    0,              0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionChannelsApart},    0, 0, A, "channels" },
+        { "together", 0,              0,                  AV_OPT_TYPE_CONST, {.i64=RubberBandOptionChannelsTogether}, 0, 0, A, "channels" },
+    { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(rubberband);
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    RubberBandContext *s = ctx->priv;
+
+    if (s->rbs)
+        rubberband_delete(s->rbs);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts = NULL;
+    static const enum AVSampleFormat sample_fmts[] = {
+        AV_SAMPLE_FMT_FLTP,
+        AV_SAMPLE_FMT_NONE,
+    };
+    int ret;
+
+    layouts = ff_all_channel_counts();
+    if (!layouts)
+        return AVERROR(ENOMEM);
+    ret = ff_set_common_channel_layouts(ctx, layouts);
+    if (ret < 0)
+        return ret;
+
+    formats = ff_make_format_list(sample_fmts);
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ret = ff_set_common_formats(ctx, formats);
+    if (ret < 0)
+        return ret;
+
+    formats = ff_all_samplerates();
+    if (!formats)
+        return AVERROR(ENOMEM);
+    return ff_set_common_samplerates(ctx, formats);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    RubberBandContext *s = inlink->dst->priv;
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+    AVFrame *out;
+    int ret = 0, nb_samples;
+
+    rubberband_process(s->rbs, (const float *const *)in->data, in->nb_samples, 0);
+    s->nb_samples_in += in->nb_samples;
+
+    nb_samples = rubberband_available(s->rbs);
+    if (nb_samples > 0) {
+        out = ff_get_audio_buffer(inlink, nb_samples);
+        if (!out) {
+            av_frame_free(&in);
+            return AVERROR(ENOMEM);
+        }
+        out->pts = av_rescale_q(s->nb_samples_out,
+                     (AVRational){ 1, outlink->sample_rate },
+                     outlink->time_base);
+        nb_samples = rubberband_retrieve(s->rbs, (float *const *)out->data, nb_samples);
+        out->nb_samples = nb_samples;
+        ret = ff_filter_frame(outlink, out);
+        s->nb_samples_out += nb_samples;
+    }
+
+    av_frame_free(&in);
+    return ret;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    RubberBandContext *s = ctx->priv;
+    int opts = s->transients|s->detector|s->phase|s->window|
+               s->smoothing|s->formant|s->opitch|s->channels|
+               RubberBandOptionProcessRealTime;
+
+    if (s->rbs)
+        rubberband_delete(s->rbs);
+    s->rbs = rubberband_new(inlink->sample_rate, inlink->channels, opts, 1. / s->tempo, s->pitch);
+
+    inlink->partial_buf_size =
+    inlink->min_samples =
+    inlink->max_samples = rubberband_get_samples_required(s->rbs);
+
+    return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    RubberBandContext *s = ctx->priv;
+    AVFilterLink *inlink = ctx->inputs[0];
+    int ret = 0;
+
+    ret = ff_request_frame(ctx->inputs[0]);
+
+    if (ret == AVERROR_EOF && !s->flushed) {
+        AVFrame *out = ff_get_audio_buffer(inlink, 1);
+        int nb_samples;
+
+        if (!out)
+            return AVERROR(ENOMEM);
+
+        rubberband_process(s->rbs, (const float *const *)out->data, 1, 1);
+        av_frame_free(&out);
+        s->flushed = 1;
+        nb_samples = rubberband_available(s->rbs);
+
+        if (nb_samples > 0) {
+            out = ff_get_audio_buffer(inlink, nb_samples);
+            if (!out)
+                return AVERROR(ENOMEM);
+            out->pts = av_rescale_q(s->nb_samples_out,
+                         (AVRational){ 1, outlink->sample_rate },
+                         outlink->time_base);
+            nb_samples = rubberband_retrieve(s->rbs, (float *const *)out->data, nb_samples);
+            out->nb_samples = nb_samples;
+            ret = ff_filter_frame(outlink, out);
+            s->nb_samples_out += nb_samples;
+        }
+        av_log(ctx, AV_LOG_DEBUG, "nb_samples_in %"PRId64" nb_samples_out %"PRId64"\n",
+                                   s->nb_samples_in, s->nb_samples_out);
+    }
+
+    return ret;
+}
+
+static const AVFilterPad rubberband_inputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_AUDIO,
+        .config_props  = config_input,
+        .filter_frame  = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad rubberband_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_AUDIO,
+        .request_frame = request_frame,
+    },
+    { NULL }
+};
+
+AVFilter ff_af_rubberband = {
+    .name          = "rubberband",
+    .description   = NULL_IF_CONFIG_SMALL("Apply time-stretching and pitch-shifting."),
+    .query_formats = query_formats,
+    .priv_size     = sizeof(RubberBandContext),
+    .priv_class    = &rubberband_class,
+    .uninit        = uninit,
+    .inputs        = rubberband_inputs,
+    .outputs       = rubberband_outputs,
+};