FFmpeg
af_amultiply.c
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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 
22 #include "libavutil/common.h"
23 #include "libavutil/float_dsp.h"
24 #include "libavutil/opt.h"
25 
26 #include "audio.h"
27 #include "avfilter.h"
28 #include "formats.h"
29 #include "filters.h"
30 #include "internal.h"
31 
32 typedef struct AudioMultiplyContext {
33  const AVClass *class;
34 
36  int planes;
37  int channels;
39 
42 
44 {
45  AudioMultiplyContext *s = ctx->priv;
46  int i, ret, status;
47  int nb_samples;
48  int64_t pts;
49 
51 
52  nb_samples = FFMIN(ff_inlink_queued_samples(ctx->inputs[0]),
53  ff_inlink_queued_samples(ctx->inputs[1]));
54  for (i = 0; i < ctx->nb_inputs && nb_samples > 0; i++) {
55  if (s->frames[i])
56  continue;
57 
58  if (ff_inlink_check_available_samples(ctx->inputs[i], nb_samples) > 0) {
59  ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &s->frames[i]);
60  if (ret < 0)
61  return ret;
62  }
63  }
64 
65  if (s->frames[0] && s->frames[1]) {
66  AVFrame *out;
67  int plane_samples;
68 
69  if (av_sample_fmt_is_planar(ctx->inputs[0]->format))
70  plane_samples = FFALIGN(s->frames[0]->nb_samples, s->samples_align);
71  else
72  plane_samples = FFALIGN(s->frames[0]->nb_samples * s->channels, s->samples_align);
73 
74  out = ff_get_audio_buffer(ctx->outputs[0], s->frames[0]->nb_samples);
75  if (!out)
76  return AVERROR(ENOMEM);
77 
78  out->pts = s->frames[0]->pts;
79 
80  if (av_get_packed_sample_fmt(ctx->inputs[0]->format) == AV_SAMPLE_FMT_FLT) {
81  for (i = 0; i < s->planes; i++) {
82  s->fdsp->vector_fmul((float *)out->extended_data[i],
83  (const float *)s->frames[0]->extended_data[i],
84  (const float *)s->frames[1]->extended_data[i],
85  plane_samples);
86  }
87  } else {
88  for (i = 0; i < s->planes; i++) {
89  s->fdsp->vector_dmul((double *)out->extended_data[i],
90  (const double *)s->frames[0]->extended_data[i],
91  (const double *)s->frames[1]->extended_data[i],
92  plane_samples);
93  }
94  }
95  emms_c();
96 
97  av_frame_free(&s->frames[0]);
98  av_frame_free(&s->frames[1]);
99 
100  ret = ff_filter_frame(ctx->outputs[0], out);
101  if (ret < 0)
102  return ret;
103  }
104 
105  if (!nb_samples) {
106  for (i = 0; i < 2; i++) {
107  if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
108  ff_outlink_set_status(ctx->outputs[0], status, pts);
109  return 0;
110  }
111  }
112  }
113 
114  if (ff_outlink_frame_wanted(ctx->outputs[0])) {
115  for (i = 0; i < 2; i++) {
116  if (ff_inlink_queued_samples(ctx->inputs[i]) > 0)
117  continue;
118  ff_inlink_request_frame(ctx->inputs[i]);
119  return 0;
120  }
121  }
122  return 0;
123 }
124 
125 static int config_output(AVFilterLink *outlink)
126 {
127  AVFilterContext *ctx = outlink->src;
128  AudioMultiplyContext *s = ctx->priv;
129  AVFilterLink *inlink = ctx->inputs[0];
130 
131  s->channels = inlink->channels;
132  s->planes = av_sample_fmt_is_planar(inlink->format) ? inlink->channels : 1;
133  s->samples_align = 16;
134 
135  return 0;
136 }
137 
139 {
140  AudioMultiplyContext *s = ctx->priv;
141 
142  s->fdsp = avpriv_float_dsp_alloc(0);
143  if (!s->fdsp)
144  return AVERROR(ENOMEM);
145 
146  return 0;
147 }
148 
150 {
151  AudioMultiplyContext *s = ctx->priv;
152  av_freep(&s->fdsp);
153 }
154 
155 static const AVFilterPad inputs[] = {
156  {
157  .name = "multiply0",
158  .type = AVMEDIA_TYPE_AUDIO,
159  },
160  {
161  .name = "multiply1",
162  .type = AVMEDIA_TYPE_AUDIO,
163  },
164 };
165 
166 static const AVFilterPad outputs[] = {
167  {
168  .name = "default",
169  .type = AVMEDIA_TYPE_AUDIO,
170  .config_props = config_output,
171  },
172 };
173 
175  .name = "amultiply",
176  .description = NULL_IF_CONFIG_SMALL("Multiply two audio streams."),
177  .priv_size = sizeof(AudioMultiplyContext),
178  .init = init,
179  .uninit = uninit,
180  .activate = activate,
185 };
ff_get_audio_buffer
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:88
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:69
status
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
out
FILE * out
Definition: movenc.c:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AudioMultiplyContext::fdsp
AVFloatDSPContext * fdsp
Definition: af_amultiply.c:40
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
formats.h
FF_FILTER_FORWARD_STATUS_BACK_ALL
#define FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, filter)
Forward the status on an output link to all input links.
Definition: filters.h:212
pts
static int64_t pts
Definition: transcode_aac.c:653
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
ff_inlink_check_available_samples
int ff_inlink_check_available_samples(AVFilterLink *link, unsigned min)
Test if enough samples are available on the link.
Definition: avfilter.c:1401
av_cold
#define av_cold
Definition: attributes.h:90
config_output
static int config_output(AVFilterLink *outlink)
Definition: af_amultiply.c:125
ff_outlink_set_status
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
ff_inlink_request_frame
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1534
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
av_sample_fmt_is_planar
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
Definition: samplefmt.c:112
filters.h
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_amultiply.c:149
ctx
AVFormatContext * ctx
Definition: movenc.c:48
init
static av_cold int init(AVFilterContext *ctx)
Definition: af_amultiply.c:138
inputs
static const AVFilterPad inputs[]
Definition: af_amultiply.c:155
AudioMultiplyContext::samples_align
int samples_align
Definition: af_amultiply.c:38
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
ff_inlink_consume_samples
int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max, AVFrame **rframe)
Take samples from the link's FIFO and update the link's stats.
Definition: avfilter.c:1436
ff_inlink_acknowledge_status
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1371
float_dsp.h
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AudioMultiplyContext::frames
AVFrame * frames[2]
Definition: af_amultiply.c:35
AVFloatDSPContext
Definition: float_dsp.h:24
activate
static int activate(AVFilterContext *ctx)
Definition: af_amultiply.c:43
internal.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AudioMultiplyContext::channels
int channels
Definition: af_amultiply.c:37
common.h
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AudioMultiplyContext::planes
int planes
Definition: af_amultiply.c:36
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
ff_inlink_queued_samples
int ff_inlink_queued_samples(AVFilterLink *link)
Definition: avfilter.c:1396
AVFilter
Filter definition.
Definition: avfilter.h:149
ret
ret
Definition: filter_design.txt:187
channel_layout.h
avfilter.h
av_get_packed_sample_fmt
enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)
Get the packed alternative form of the given sample format.
Definition: samplefmt.c:75
AV_SAMPLE_FMT_DBLP
@ AV_SAMPLE_FMT_DBLP
double, planar
Definition: samplefmt.h:70
AVFilterContext
An instance of a filter.
Definition: avfilter.h:386
ff_af_amultiply
const AVFilter ff_af_amultiply
Definition: af_amultiply.c:174
audio.h
outputs
static const AVFilterPad outputs[]
Definition: af_amultiply.c:166
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:192
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
avpriv_float_dsp_alloc
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
Definition: float_dsp.c:135
ff_outlink_frame_wanted
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function. If this function returns true
AV_SAMPLE_FMT_DBL
@ AV_SAMPLE_FMT_DBL
double
Definition: samplefmt.h:64
AudioMultiplyContext
Definition: af_amultiply.c:32
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition: samplefmt.h:63
FILTER_SAMPLEFMTS
#define FILTER_SAMPLEFMTS(...)
Definition: internal.h:179