FFmpeg
af_bs2b.c
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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 
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 
35 typedef void (*filter_func)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
36 
37 typedef struct Bs2bContext {
38  const AVClass *class;
39 
40  int profile;
41  int fcut;
42  int feed;
43 
44  t_bs2bdp bs2bp;
45 
47 } Bs2bContext;
48 
49 #define OFFSET(x) offsetof(Bs2bContext, x)
50 #define A AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
51 
52 static const AVOption bs2b_options[] = {
53  { "profile", "Apply a pre-defined crossfeed level",
54  OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
55  { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
56  { "cmoy", "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL }, 0, 0, A, "profile" },
57  { "jmeier", "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL }, 0, 0, A, "profile" },
58  { "fcut", "Set cut frequency (in Hz)",
59  OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
60  { "feed", "Set feed level (in Hz)",
61  OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
62  { NULL },
63 };
64 
66 
68 {
69  Bs2bContext *bs2b = ctx->priv;
70 
71  if (!(bs2b->bs2bp = bs2b_open()))
72  return AVERROR(ENOMEM);
73 
74  bs2b_set_level(bs2b->bs2bp, bs2b->profile);
75 
76  if (bs2b->fcut)
77  bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
78 
79  if (bs2b->feed)
80  bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
81 
82  return 0;
83 }
84 
86 {
87  Bs2bContext *bs2b = ctx->priv;
88 
89  if (bs2b->bs2bp)
90  bs2b_close(bs2b->bs2bp);
91 }
92 
94 {
97 
98  static const enum AVSampleFormat sample_fmts[] = {
105  };
106  int ret;
107 
108  if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
109  return AVERROR(ENOMEM);
110  ret = ff_set_common_channel_layouts(ctx, layouts);
111  if (ret < 0)
112  return ret;
113 
114  formats = ff_make_format_list(sample_fmts);
115  if (!formats)
116  return AVERROR(ENOMEM);
117  ret = ff_set_common_formats(ctx, formats);
118  if (ret < 0)
119  return ret;
120 
121  formats = ff_all_samplerates();
122  if (!formats)
123  return AVERROR(ENOMEM);
124  return ff_set_common_samplerates(ctx, formats);
125 }
126 
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(outlink, frame->nb_samples);
139  if (!out_frame) {
140  av_frame_free(&frame);
141  return AVERROR(ENOMEM);
142  }
143  av_frame_copy(out_frame, frame);
144  ret = av_frame_copy_props(out_frame, frame);
145  if (ret < 0) {
146  av_frame_free(&out_frame);
147  av_frame_free(&frame);
148  return ret;
149  }
150  }
151 
152  bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
153 
154  if (frame != out_frame)
155  av_frame_free(&frame);
156 
157  return ff_filter_frame(outlink, out_frame);
158 }
159 
160 static int config_output(AVFilterLink *outlink)
161 {
162  AVFilterContext *ctx = outlink->src;
163  Bs2bContext *bs2b = ctx->priv;
164  AVFilterLink *inlink = ctx->inputs[0];
165 
166  int srate = inlink->sample_rate;
167 
168  switch (inlink->format) {
169  case AV_SAMPLE_FMT_U8:
170  bs2b->filter = (filter_func) bs2b_cross_feed_u8;
171  break;
172  case AV_SAMPLE_FMT_S16:
173  bs2b->filter = (filter_func) bs2b_cross_feed_s16;
174  break;
175  case AV_SAMPLE_FMT_S32:
176  bs2b->filter = (filter_func) bs2b_cross_feed_s32;
177  break;
178  case AV_SAMPLE_FMT_FLT:
179  bs2b->filter = (filter_func) bs2b_cross_feed_f;
180  break;
181  case AV_SAMPLE_FMT_DBL:
182  bs2b->filter = (filter_func) bs2b_cross_feed_d;
183  break;
184  default:
185  return AVERROR_BUG;
186  }
187 
188  if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
189  return AVERROR(ENOSYS);
190 
191  bs2b_set_srate(bs2b->bs2bp, srate);
192 
193  return 0;
194 }
195 
196 static const AVFilterPad bs2b_inputs[] = {
197  {
198  .name = "default",
199  .type = AVMEDIA_TYPE_AUDIO,
200  .filter_frame = filter_frame,
201  },
202  { NULL }
203 };
204 
205 static const AVFilterPad bs2b_outputs[] = {
206  {
207  .name = "default",
208  .type = AVMEDIA_TYPE_AUDIO,
209  .config_props = config_output,
210  },
211  { NULL }
212 };
213 
215  .name = "bs2b",
216  .description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
217  .query_formats = query_formats,
218  .priv_size = sizeof(Bs2bContext),
219  .priv_class = &bs2b_class,
220  .init = init,
221  .uninit = uninit,
222  .inputs = bs2b_inputs,
223  .outputs = bs2b_outputs,
224 };
#define NULL
Definition: coverity.c:32
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:550
t_bs2bdp bs2bp
Definition: af_bs2b.c:44
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
Main libavfilter public API header.
static const AVFilterPad bs2b_inputs[]
Definition: af_bs2b.c:196
void(* filter_func)(t_bs2bdp bs2bdp, uint8_t *sample, int n)
Definition: af_bs2b.c:35
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: af_bs2b.c:127
filter_func filter
Definition: af_bs2b.c:46
#define AV_CH_LAYOUT_STEREO
#define sample
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1093
uint8_t
#define av_cold
Definition: attributes.h:82
AV_SAMPLE_FMT_U8
AVOptions.
static int query_formats(AVFilterContext *ctx)
Definition: af_bs2b.c:93
signed 32 bits
Definition: samplefmt.h:62
A filter pad used for either input or output.
Definition: internal.h:54
AVFilter ff_af_bs2b
Definition: af_bs2b.c:214
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:569
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:342
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:86
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:792
int feed
Definition: af_bs2b.c:42
audio channel layout utility functions
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
AVFormatContext * ctx
Definition: movenc.c:48
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
int n
Definition: avisynth_c.h:760
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static int config_output(AVFilterLink *outlink)
Definition: af_bs2b.c:160
A list of supported channel layouts.
Definition: formats.h:85
int profile
Definition: af_bs2b.c:40
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:594
int fcut
Definition: af_bs2b.c:41
AVFILTER_DEFINE_CLASS(bs2b)
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
#define OFFSET(x)
Definition: af_bs2b.c:49
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:394
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
static const AVOption bs2b_options[]
Definition: af_bs2b.c:52
common internal and external API header
signed 16 bits
Definition: samplefmt.h:61
static const AVFilterPad bs2b_outputs[]
Definition: af_bs2b.c:205
A list of supported formats for one end of a filter link.
Definition: formats.h:64
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_bs2b.c:85
An instance of a filter.
Definition: avfilter.h:338
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
formats
Definition: signature.h:48
#define A
Definition: af_bs2b.c:50
internal API functions
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
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:342
static av_cold int init(AVFilterContext *ctx)
Definition: af_bs2b.c:67
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:361
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:557
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:654