马兴瑞出席省环境保护督察整改工作领导小组会议。

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) 2018 Paul B Mahol
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public License
8			* as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg 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 Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public License
17			* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18			* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#include "libavutil/channel_layout.h"
22			#include "libavutil/mem.h"
23			#include "libavutil/opt.h"
24			#include "audio.h"
25			#include "avfilter.h"
26			#include "formats.h"
27			#include "filters.h"
28			#include "window_func.h"
29
30			typedef struct HilbertContext {
31			const AVClass *class;
32
33			int sample_rate;
34			int nb_taps;
35			int nb_samples;
36			int win_func;
37
38			float *taps;
39			int64_t pts;
40			} HilbertContext;
41
42			#define OFFSET(x) offsetof(HilbertContext, x)
43			#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
44
45			static const AVOption hilbert_options[] = {
46			{ "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS },
47			{ "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS },
48			{ "taps", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS },
49			{ "t", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS },
50			{ "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
51			{ "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
52			WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_BLACKMAN),
53			WIN_FUNC_OPTION("w", OFFSET(win_func), FLAGS, WFUNC_BLACKMAN),
54			{NULL}
55			};
56
57			AVFILTER_DEFINE_CLASS(hilbert);
58
59		✗	static av_cold int init(AVFilterContext *ctx)
60			{
61		✗	HilbertContext *s = ctx->priv;
62
63		✗	if (!(s->nb_taps & 1)) {
64		✗	av_log(s, AV_LOG_ERROR, "Number of taps %d must be odd length.\n", s->nb_taps);
65		✗	return AVERROR(EINVAL);
66			}
67
68		✗	return 0;
69			}
70
71		✗	static av_cold void uninit(AVFilterContext *ctx)
72			{
73		✗	HilbertContext *s = ctx->priv;
74
75		✗	av_freep(&s->taps);
76		✗	}
77
78		✗	static av_cold int query_formats(const AVFilterContext *ctx,
79			AVFilterFormatsConfig **cfg_in,
80			AVFilterFormatsConfig **cfg_out)
81			{
82		✗	HilbertContext *s = ctx->priv;
83			static const AVChannelLayout chlayouts[] = { AV_CHANNEL_LAYOUT_MONO, { 0 } };
84		✗	int sample_rates[] = { s->sample_rate, -1 };
85			static const enum AVSampleFormat sample_fmts[] = {
86			AV_SAMPLE_FMT_FLT,
87			AV_SAMPLE_FMT_NONE
88			};
89		✗	int ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, sample_fmts);
90		✗	if (ret < 0)
91		✗	return ret;
92
93		✗	ret = ff_set_common_channel_layouts_from_list2(ctx, cfg_in, cfg_out, chlayouts);
94		✗	if (ret < 0)
95		✗	return ret;
96
97		✗	return ff_set_common_samplerates_from_list2(ctx, cfg_in, cfg_out, sample_rates);
98			}
99
100		✗	static av_cold int config_props(AVFilterLink *outlink)
101			{
102		✗	AVFilterContext *ctx = outlink->src;
103		✗	HilbertContext *s = ctx->priv;
104			float overlap;
105			int i;
106
107		✗	s->taps = av_malloc_array(s->nb_taps, sizeof(*s->taps));
108		✗	if (!s->taps)
109		✗	return AVERROR(ENOMEM);
110
111		✗	generate_window_func(s->taps, s->nb_taps, s->win_func, &overlap);
112
113		✗	for (i = 0; i < s->nb_taps; i++) {
114		✗	int k = -(s->nb_taps / 2) + i;
115
116		✗	if (k & 1) {
117		✗	float pk = M_PI * k;
118
119		✗	s->taps[i] *= (1.f - cosf(pk)) / pk;
120			} else {
121		✗	s->taps[i] = 0.f;
122			}
123			}
124
125		✗	s->pts = 0;
126
127		✗	return 0;
128			}
129
130		✗	static int activate(AVFilterContext *ctx)
131			{
132		✗	AVFilterLink *outlink = ctx->outputs[0];
133		✗	HilbertContext *s = ctx->priv;
134			AVFrame *frame;
135			int nb_samples;
136
137		✗	if (!ff_outlink_frame_wanted(outlink))
138		✗	return FFERROR_NOT_READY;
139
140		✗	nb_samples = FFMIN(s->nb_samples, s->nb_taps - s->pts);
141		✗	if (nb_samples <= 0) {
142		✗	ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
143		✗	return 0;
144			}
145
146		✗	if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
147		✗	return AVERROR(ENOMEM);
148
149		✗	memcpy(frame->data[0], s->taps + s->pts, nb_samples * sizeof(float));
150
151		✗	frame->pts = s->pts;
152		✗	s->pts += nb_samples;
153		✗	return ff_filter_frame(outlink, frame);
154			}
155
156			static const AVFilterPad hilbert_outputs[] = {
157			{
158			.name = "default",
159			.type = AVMEDIA_TYPE_AUDIO,
160			.config_props = config_props,
161			},
162			};
163
164			const FFFilter ff_asrc_hilbert = {
165			.p.name = "hilbert",
166			.p.description = NULL_IF_CONFIG_SMALL("Generate a Hilbert transform FIR coefficients."),
167			.p.priv_class = &hilbert_class,
168			.init = init,
169			.uninit = uninit,
170			.activate = activate,
171			.priv_size = sizeof(HilbertContext),
172			FILTER_OUTPUTS(hilbert_outputs),
173			FILTER_QUERY_FUNC2(query_formats),
174			};
175