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/**
20 * @file
21 * Bauer stereo-to-binaural filter
22 */
23
24#include <bs2b.h>
25
26#include "libavutil/channel_layout.h"
27#include "libavutil/common.h"
28#include "libavutil/opt.h"
29
30#include "audio.h"
31#include "avfilter.h"
32#include "formats.h"
33#include "internal.h"
34
35typedef struct Bs2bContext {
36    const AVClass *class;
37
38    int profile;
39    int fcut;
40    int feed;
41
42    t_bs2bdp bs2bp;
43
44    void (*filter)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
45} Bs2bContext;
46
47#define OFFSET(x) offsetof(Bs2bContext, x)
48#define A AV_OPT_FLAG_AUDIO_PARAM
49
50static const AVOption options[] = {
51    { "profile", "Apply a pre-defined crossfeed level",
52            OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
53        { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
54        { "cmoy",    "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL    }, 0, 0, A, "profile" },
55        { "jmeier",  "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL  }, 0, 0, A, "profile" },
56    { "fcut", "Set cut frequency (in Hz)",
57            OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
58    { "feed", "Set feed level (in Hz)",
59            OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
60    { NULL },
61};
62
63static const AVClass bs2b_class = {
64    .class_name = "bs2b filter",
65    .item_name  = av_default_item_name,
66    .option     = options,
67    .version    = LIBAVUTIL_VERSION_INT,
68};
69
70static av_cold int init(AVFilterContext *ctx)
71{
72    Bs2bContext *bs2b = ctx->priv;
73
74    if (!(bs2b->bs2bp = bs2b_open()))
75        return AVERROR(ENOMEM);
76
77    bs2b_set_level(bs2b->bs2bp, bs2b->profile);
78
79    if (bs2b->fcut)
80        bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
81
82    if (bs2b->feed)
83        bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
84
85    return 0;
86}
87
88static av_cold void uninit(AVFilterContext *ctx)
89{
90    Bs2bContext *bs2b = ctx->priv;
91
92    if (bs2b->bs2bp)
93        bs2b_close(bs2b->bs2bp);
94}
95
96static int query_formats(AVFilterContext *ctx)
97{
98    AVFilterFormats *formats = NULL;
99    AVFilterChannelLayouts *layouts = NULL;
100
101    static const enum AVSampleFormat sample_fmts[] = {
102        AV_SAMPLE_FMT_U8,
103        AV_SAMPLE_FMT_S16,
104        AV_SAMPLE_FMT_S32,
105        AV_SAMPLE_FMT_FLT,
106        AV_SAMPLE_FMT_DBL,
107        AV_SAMPLE_FMT_NONE,
108    };
109
110    if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
111        return AVERROR(ENOMEM);
112    ff_set_common_channel_layouts(ctx, layouts);
113
114    formats = ff_make_format_list(sample_fmts);
115    if (!formats)
116        return AVERROR(ENOMEM);
117    ff_set_common_formats(ctx, formats);
118
119    formats = ff_all_samplerates();
120    if (!formats)
121        return AVERROR(ENOMEM);
122    ff_set_common_samplerates(ctx, formats);
123
124    return 0;
125}
126
127static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
128{
129    int ret;
130    AVFrame *out_frame;
131
132    Bs2bContext     *bs2b = inlink->dst->priv;
133    AVFilterLink *outlink = inlink->dst->outputs[0];
134
135    if (av_frame_is_writable(frame)) {
136        out_frame = frame;
137    } else {
138        out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
139        if (!out_frame)
140            return AVERROR(ENOMEM);
141        av_frame_copy(out_frame, frame);
142        ret = av_frame_copy_props(out_frame, frame);
143        if (ret < 0) {
144            av_frame_free(&out_frame);
145            av_frame_free(&frame);
146            return ret;
147        }
148    }
149
150    bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
151
152    if (frame != out_frame)
153        av_frame_free(&frame);
154
155    return ff_filter_frame(outlink, out_frame);
156}
157
158static int config_output(AVFilterLink *outlink)
159{
160    AVFilterContext *ctx = outlink->src;
161    Bs2bContext    *bs2b = ctx->priv;
162    AVFilterLink *inlink = ctx->inputs[0];
163
164    int srate = inlink->sample_rate;
165
166    switch (inlink->format) {
167    case AV_SAMPLE_FMT_U8:
168        bs2b->filter = bs2b_cross_feed_u8;
169        break;
170    case AV_SAMPLE_FMT_S16:
171        bs2b->filter = (void*)bs2b_cross_feed_s16;
172        break;
173    case AV_SAMPLE_FMT_S32:
174        bs2b->filter = (void*)bs2b_cross_feed_s32;
175        break;
176    case AV_SAMPLE_FMT_FLT:
177        bs2b->filter = (void*)bs2b_cross_feed_f;
178        break;
179    case AV_SAMPLE_FMT_DBL:
180        bs2b->filter = (void*)bs2b_cross_feed_d;
181        break;
182    default:
183        return AVERROR_BUG;
184    }
185
186    if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
187        return AVERROR(ENOSYS);
188
189    bs2b_set_srate(bs2b->bs2bp, srate);
190
191    return 0;
192}
193
194static const AVFilterPad bs2b_inputs[] = {
195    {
196        .name           = "default",
197        .type           = AVMEDIA_TYPE_AUDIO,
198        .filter_frame   = filter_frame,
199    },
200    { NULL }
201};
202
203static const AVFilterPad bs2b_outputs[] = {
204    {
205        .name           = "default",
206        .type           = AVMEDIA_TYPE_AUDIO,
207        .config_props   = config_output,
208    },
209    { NULL }
210};
211
212AVFilter ff_af_bs2b = {
213    .name           = "bs2b",
214    .description    = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
215    .query_formats  = query_formats,
216    .priv_size      = sizeof(Bs2bContext),
217    .priv_class     = &bs2b_class,
218    .init           = init,
219    .uninit         = uninit,
220    .inputs         = bs2b_inputs,
221    .outputs        = bs2b_outputs,
222};
223