左心房扩大是什么意思

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
8			* License 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 GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#include "libavutil/channel_layout.h"
22			#include "libavutil/common.h"
23			#include "libavutil/float_dsp.h"
24			#include "libavutil/mem.h"
25
26			#include "audio.h"
27			#include "avfilter.h"
28			#include "filters.h"
29
30			typedef struct AudioMultiplyContext {
31			const AVClass *class;
32
33			AVFrame *frames[2];
34			int planes;
35			int channels;
36			int samples_align;
37
38			AVFloatDSPContext *fdsp;
39			} AudioMultiplyContext;
40
41		✗	static int activate(AVFilterContext *ctx)
42			{
43		✗	AudioMultiplyContext *s = ctx->priv;
44			int i, ret, status;
45			int nb_samples;
46			int64_t pts;
47
48		✗	FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
49
50		✗	nb_samples = FFMIN(ff_inlink_queued_samples(ctx->inputs[0]),
51			ff_inlink_queued_samples(ctx->inputs[1]));
52		✗	for (i = 0; i < ctx->nb_inputs && nb_samples > 0; i++) {
53		✗	if (s->frames[i])
54		✗	continue;
55
56		✗	if (ff_inlink_check_available_samples(ctx->inputs[i], nb_samples) > 0) {
57		✗	ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &s->frames[i]);
58		✗	if (ret < 0)
59		✗	return ret;
60			}
61			}
62
63		✗	if (s->frames[0] && s->frames[1]) {
64			AVFrame *out;
65			int plane_samples;
66
67		✗	if (av_sample_fmt_is_planar(ctx->inputs[0]->format))
68		✗	plane_samples = FFALIGN(s->frames[0]->nb_samples, s->samples_align);
69			else
70		✗	plane_samples = FFALIGN(s->frames[0]->nb_samples * s->channels, s->samples_align);
71
72		✗	out = ff_get_audio_buffer(ctx->outputs[0], s->frames[0]->nb_samples);
73		✗	if (!out)
74		✗	return AVERROR(ENOMEM);
75
76		✗	out->pts = s->frames[0]->pts;
77		✗	out->duration = s->frames[0]->duration;
78
79		✗	if (av_get_packed_sample_fmt(ctx->inputs[0]->format) == AV_SAMPLE_FMT_FLT) {
80		✗	for (i = 0; i < s->planes; i++) {
81		✗	s->fdsp->vector_fmul((float *)out->extended_data[i],
82		✗	(const float *)s->frames[0]->extended_data[i],
83		✗	(const float *)s->frames[1]->extended_data[i],
84			plane_samples);
85			}
86			} else {
87		✗	for (i = 0; i < s->planes; i++) {
88		✗	s->fdsp->vector_dmul((double *)out->extended_data[i],
89		✗	(const double *)s->frames[0]->extended_data[i],
90		✗	(const double *)s->frames[1]->extended_data[i],
91			plane_samples);
92			}
93			}
94
95		✗	av_frame_free(&s->frames[0]);
96		✗	av_frame_free(&s->frames[1]);
97
98		✗	ret = ff_filter_frame(ctx->outputs[0], out);
99		✗	if (ret < 0)
100		✗	return ret;
101			}
102
103		✗	if (!nb_samples) {
104		✗	for (i = 0; i < 2; i++) {
105		✗	if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
106		✗	ff_outlink_set_status(ctx->outputs[0], status, pts);
107		✗	return 0;
108			}
109			}
110			}
111
112		✗	if (ff_outlink_frame_wanted(ctx->outputs[0])) {
113		✗	for (i = 0; i < 2; i++) {
114		✗	if (s->frames[i] || ff_inlink_queued_samples(ctx->inputs[i]) > 0)
115		✗	continue;
116		✗	ff_inlink_request_frame(ctx->inputs[i]);
117		✗	return 0;
118			}
119			}
120		✗	return 0;
121			}
122
123		✗	static int config_output(AVFilterLink *outlink)
124			{
125		✗	AVFilterContext *ctx = outlink->src;
126		✗	AudioMultiplyContext *s = ctx->priv;
127		✗	AVFilterLink *inlink = ctx->inputs[0];
128
129		✗	s->channels = inlink->ch_layout.nb_channels;
130		✗	s->planes = av_sample_fmt_is_planar(inlink->format) ? inlink->ch_layout.nb_channels : 1;
131		✗	s->samples_align = 16;
132
133		✗	return 0;
134			}
135
136		✗	static av_cold int init(AVFilterContext *ctx)
137			{
138		✗	AudioMultiplyContext *s = ctx->priv;
139
140		✗	s->fdsp = avpriv_float_dsp_alloc(0);
141		✗	if (!s->fdsp)
142		✗	return AVERROR(ENOMEM);
143
144		✗	return 0;
145			}
146
147		✗	static av_cold void uninit(AVFilterContext *ctx)
148			{
149		✗	AudioMultiplyContext *s = ctx->priv;
150		✗	av_freep(&s->fdsp);
151		✗	}
152
153			static const AVFilterPad inputs[] = {
154			{
155			.name = "multiply0",
156			.type = AVMEDIA_TYPE_AUDIO,
157			},
158			{
159			.name = "multiply1",
160			.type = AVMEDIA_TYPE_AUDIO,
161			},
162			};
163
164			static const AVFilterPad outputs[] = {
165			{
166			.name = "default",
167			.type = AVMEDIA_TYPE_AUDIO,
168			.config_props = config_output,
169			},
170			};
171
172			const FFFilter ff_af_amultiply = {
173			.p.name = "amultiply",
174			.p.description = NULL_IF_CONFIG_SMALL("Multiply two audio streams."),
175			.priv_size = sizeof(AudioMultiplyContext),
176			.init = init,
177			.uninit = uninit,
178			.activate = activate,
179			FILTER_INPUTS(inputs),
180			FILTER_OUTPUTS(outputs),
181			FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
182			AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP),
183			};
184