FFmpeg
af_amerge.c
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1 /*
2  * Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org>
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
14  * GNU 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 /**
22  * @file
23  * Audio merging filter
24  */
25 
26 #include "libavutil/avstring.h"
27 #include "libavutil/bprint.h"
29 #include "libavutil/opt.h"
30 #include "avfilter.h"
31 #include "filters.h"
32 #include "audio.h"
33 #include "internal.h"
34 
35 #define SWR_CH_MAX 64
36 
37 typedef struct AMergeContext {
38  const AVClass *class;
39  int nb_inputs;
40  int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */
41  int bps;
42  struct amerge_input {
43  int nb_ch; /**< number of channels for the input */
44  } *in;
46 
47 #define OFFSET(x) offsetof(AMergeContext, x)
48 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
49 
50 static const AVOption amerge_options[] = {
51  { "inputs", "specify the number of inputs", OFFSET(nb_inputs),
52  AV_OPT_TYPE_INT, { .i64 = 2 }, 1, SWR_CH_MAX, FLAGS },
53  { NULL }
54 };
55 
56 AVFILTER_DEFINE_CLASS(amerge);
57 
59 {
60  AMergeContext *s = ctx->priv;
61 
62  av_freep(&s->in);
63 }
64 
66 {
67  static const enum AVSampleFormat packed_sample_fmts[] = {
74  };
75  AMergeContext *s = ctx->priv;
76  AVChannelLayout *inlayout[SWR_CH_MAX] = { NULL }, outlayout = { 0 };
77  uint64_t outmask = 0;
79  int i, ret, overlap = 0, nb_ch = 0;
80 
81  for (i = 0; i < s->nb_inputs; i++) {
82  if (!ctx->inputs[i]->incfg.channel_layouts ||
83  !ctx->inputs[i]->incfg.channel_layouts->nb_channel_layouts) {
85  "No channel layout for input %d\n", i + 1);
86  return AVERROR(EAGAIN);
87  }
88  inlayout[i] = &ctx->inputs[i]->incfg.channel_layouts->channel_layouts[0];
89  if (ctx->inputs[i]->incfg.channel_layouts->nb_channel_layouts > 1) {
90  char buf[256];
91  av_channel_layout_describe(inlayout[i], buf, sizeof(buf));
92  av_log(ctx, AV_LOG_INFO, "Using \"%s\" for input %d\n", buf, i + 1);
93  }
94  s->in[i].nb_ch = FF_LAYOUT2COUNT(inlayout[i]);
95  if (s->in[i].nb_ch) {
96  overlap++;
97  } else {
98  s->in[i].nb_ch = inlayout[i]->nb_channels;
99  if (av_channel_layout_subset(inlayout[i], outmask))
100  overlap++;
101  outmask |= inlayout[i]->order == AV_CHANNEL_ORDER_NATIVE ?
102  inlayout[i]->u.mask : 0;
103  }
104  nb_ch += s->in[i].nb_ch;
105  }
106  if (nb_ch > SWR_CH_MAX) {
107  av_log(ctx, AV_LOG_ERROR, "Too many channels (max %d)\n", SWR_CH_MAX);
108  return AVERROR(EINVAL);
109  }
110  if (overlap) {
112  "Input channel layouts overlap: "
113  "output layout will be determined by the number of distinct input channels\n");
114  for (i = 0; i < nb_ch; i++)
115  s->route[i] = i;
116  av_channel_layout_default(&outlayout, nb_ch);
117  if (!KNOWN(&outlayout) && nb_ch)
118  av_channel_layout_from_mask(&outlayout, 0xFFFFFFFFFFFFFFFFULL >> (64 - nb_ch));
119  } else {
120  int *route[SWR_CH_MAX];
121  int c, out_ch_number = 0;
122 
123  av_channel_layout_from_mask(&outlayout, outmask);
124  route[0] = s->route;
125  for (i = 1; i < s->nb_inputs; i++)
126  route[i] = route[i - 1] + s->in[i - 1].nb_ch;
127  for (c = 0; c < 64; c++)
128  for (i = 0; i < s->nb_inputs; i++)
129  if (av_channel_layout_index_from_channel(inlayout[i], c) >= 0)
130  *(route[i]++) = out_ch_number++;
131  }
132  if ((ret = ff_set_common_formats_from_list(ctx, packed_sample_fmts)) < 0)
133  return ret;
134  for (i = 0; i < s->nb_inputs; i++) {
135  layouts = NULL;
136  if ((ret = ff_add_channel_layout(&layouts, inlayout[i])) < 0)
137  return ret;
138  if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
139  return ret;
140  }
141  layouts = NULL;
142  if ((ret = ff_add_channel_layout(&layouts, &outlayout)) < 0)
143  return ret;
144  if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
145  return ret;
146 
148 }
149 
150 static int config_output(AVFilterLink *outlink)
151 {
152  AVFilterContext *ctx = outlink->src;
153  AMergeContext *s = ctx->priv;
154  AVBPrint bp;
155  char buf[128];
156  int i;
157 
158  s->bps = av_get_bytes_per_sample(ctx->outputs[0]->format);
159  outlink->time_base = ctx->inputs[0]->time_base;
160 
162  for (i = 0; i < s->nb_inputs; i++) {
163  av_bprintf(&bp, "%sin%d:", i ? " + " : "", i);
164  av_channel_layout_describe(&ctx->inputs[i]->ch_layout, buf, sizeof(buf));
165  av_bprintf(&bp, "%s", buf);
166  }
167  av_bprintf(&bp, " -> out:");
168  av_channel_layout_describe(&ctx->outputs[0]->ch_layout, buf, sizeof(buf));
169  av_bprintf(&bp, "%s", buf);
170  av_log(ctx, AV_LOG_VERBOSE, "%s\n", bp.str);
171 
172  return 0;
173 }
174 
175 /**
176  * Copy samples from several input streams to one output stream.
177  * @param nb_inputs number of inputs
178  * @param in inputs; used only for the nb_ch field;
179  * @param route routing values;
180  * input channel i goes to output channel route[i];
181  * i < in[0].nb_ch are the channels from the first output;
182  * i >= in[0].nb_ch are the channels from the second output
183  * @param ins pointer to the samples of each inputs, in packed format;
184  * will be left at the end of the copied samples
185  * @param outs pointer to the samples of the output, in packet format;
186  * must point to a buffer big enough;
187  * will be left at the end of the copied samples
188  * @param ns number of samples to copy
189  * @param bps bytes per sample
190  */
191 static inline void copy_samples(int nb_inputs, struct amerge_input in[],
192  int *route, uint8_t *ins[],
193  uint8_t **outs, int ns, int bps)
194 {
195  int *route_cur;
196  int i, c, nb_ch = 0;
197 
198  for (i = 0; i < nb_inputs; i++)
199  nb_ch += in[i].nb_ch;
200  while (ns--) {
201  route_cur = route;
202  for (i = 0; i < nb_inputs; i++) {
203  for (c = 0; c < in[i].nb_ch; c++) {
204  memcpy((*outs) + bps * *(route_cur++), ins[i], bps);
205  ins[i] += bps;
206  }
207  }
208  *outs += nb_ch * bps;
209  }
210 }
211 
212 static void free_frames(int nb_inputs, AVFrame **input_frames)
213 {
214  int i;
215  for (i = 0; i < nb_inputs; i++)
216  av_frame_free(&input_frames[i]);
217 }
218 
219 static int try_push_frame(AVFilterContext *ctx, int nb_samples)
220 {
221  AMergeContext *s = ctx->priv;
222  AVFilterLink *outlink = ctx->outputs[0];
223  int i, ret;
224  AVFrame *outbuf, *inbuf[SWR_CH_MAX] = { NULL };
225  uint8_t *outs, *ins[SWR_CH_MAX];
226 
227  for (i = 0; i < ctx->nb_inputs; i++) {
228  ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &inbuf[i]);
229  if (ret < 0) {
230  free_frames(i, inbuf);
231  return ret;
232  }
233  ins[i] = inbuf[i]->data[0];
234  }
235 
236  outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
237  if (!outbuf) {
238  free_frames(s->nb_inputs, inbuf);
239  return AVERROR(ENOMEM);
240  }
241 
242  outs = outbuf->data[0];
243  outbuf->pts = inbuf[0]->pts;
244 
245  outbuf->nb_samples = nb_samples;
246  if ((ret = av_channel_layout_copy(&outbuf->ch_layout, &outlink->ch_layout)) < 0)
247  return ret;
248 #if FF_API_OLD_CHANNEL_LAYOUT
250  outbuf->channel_layout = outlink->channel_layout;
251  outbuf->channels = outlink->ch_layout.nb_channels;
253 #endif
254 
255  while (nb_samples) {
256  /* Unroll the most common sample formats: speed +~350% for the loop,
257  +~13% overall (including two common decoders) */
258  switch (s->bps) {
259  case 1:
260  copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 1);
261  break;
262  case 2:
263  copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 2);
264  break;
265  case 4:
266  copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 4);
267  break;
268  default:
269  copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, s->bps);
270  break;
271  }
272 
273  nb_samples = 0;
274  }
275 
276  free_frames(s->nb_inputs, inbuf);
277  return ff_filter_frame(ctx->outputs[0], outbuf);
278 }
279 
281 {
282  int i, status;
283  int ret, nb_samples;
284  int64_t pts;
285 
287 
288  nb_samples = ff_inlink_queued_samples(ctx->inputs[0]);
289  for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
290  nb_samples = FFMIN(ff_inlink_queued_samples(ctx->inputs[i]), nb_samples);
291  }
292 
293  if (nb_samples) {
294  ret = try_push_frame(ctx, nb_samples);
295  if (ret < 0)
296  return ret;
297  }
298 
299  for (i = 0; i < ctx->nb_inputs; i++) {
300  if (ff_inlink_queued_samples(ctx->inputs[i]))
301  continue;
302 
303  if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
304  ff_outlink_set_status(ctx->outputs[0], status, pts);
305  return 0;
306  } else if (ff_outlink_frame_wanted(ctx->outputs[0])) {
307  ff_inlink_request_frame(ctx->inputs[i]);
308  return 0;
309  }
310  }
311 
312  return 0;
313 }
314 
316 {
317  AMergeContext *s = ctx->priv;
318  int i, ret;
319 
320  s->in = av_calloc(s->nb_inputs, sizeof(*s->in));
321  if (!s->in)
322  return AVERROR(ENOMEM);
323  for (i = 0; i < s->nb_inputs; i++) {
324  char *name = av_asprintf("in%d", i);
325  AVFilterPad pad = {
326  .name = name,
327  .type = AVMEDIA_TYPE_AUDIO,
328  };
329  if (!name)
330  return AVERROR(ENOMEM);
331  if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
332  return ret;
333  }
334  return 0;
335 }
336 
337 static const AVFilterPad amerge_outputs[] = {
338  {
339  .name = "default",
340  .type = AVMEDIA_TYPE_AUDIO,
341  .config_props = config_output,
342  },
343 };
344 
346  .name = "amerge",
347  .description = NULL_IF_CONFIG_SMALL("Merge two or more audio streams into "
348  "a single multi-channel stream."),
349  .priv_size = sizeof(AMergeContext),
350  .init = init,
351  .uninit = uninit,
352  .activate = activate,
353  .inputs = NULL,
356  .priv_class = &amerge_class,
358 };
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:100
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:83
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AMergeContext::bps
int bps
Definition: af_amerge.c:41
name
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
Definition: writing_filters.txt:88
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
try_push_frame
static int try_push_frame(AVFilterContext *ctx, int nb_samples)
Definition: af_amerge.c:219
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:999
ff_channel_layouts_ref
int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
Add *ref as a new reference to f.
Definition: formats.c:591
layouts
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:330
ff_af_amerge
const AVFilter ff_af_amerge
Definition: af_amerge.c:345
av_asprintf
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:116
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
amerge_outputs
static const AVFilterPad amerge_outputs[]
Definition: af_amerge.c:337
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:432
AMergeContext::route
int route[SWR_CH_MAX]
channels routing, see copy_samples
Definition: af_amerge.c:40
AVOption
AVOption.
Definition: opt.h:251
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:167
AMergeContext::amerge_input
Definition: af_amerge.c:42
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
ff_set_common_all_samplerates
int ff_set_common_all_samplerates(AVFilterContext *ctx)
Equivalent to ff_set_common_samplerates(ctx, ff_all_samplerates())
Definition: formats.c:739
av_channel_layout_subset
uint64_t av_channel_layout_subset(const AVChannelLayout *channel_layout, uint64_t mask)
Find out what channels from a given set are present in a channel layout, without regard for their pos...
Definition: channel_layout.c:986
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:295
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:175
AVChannelLayout::mask
uint64_t mask
This member must be used for AV_CHANNEL_ORDER_NATIVE, and may be used for AV_CHANNEL_ORDER_AMBISONIC ...
Definition: channel_layout.h:322
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
FF_LAYOUT2COUNT
#define FF_LAYOUT2COUNT(l)
Decode a channel count encoded as a channel layout.
Definition: formats.h:108
av_channel_layout_copy
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
Make a copy of a channel layout.
Definition: channel_layout.c:637
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_amerge.c:58
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
init
static av_cold int init(AVFilterContext *ctx)
Definition: af_amerge.c:315
AV_BPRINT_SIZE_AUTOMATIC
#define AV_BPRINT_SIZE_AUTOMATIC
AVFrame::ch_layout
AVChannelLayout ch_layout
Channel layout of the audio data.
Definition: frame.h:709
pts
static int64_t pts
Definition: transcode_aac.c:654
AMergeContext
Definition: af_amerge.c:37
AVFILTER_FLAG_DYNAMIC_INPUTS
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:116
AVFrame::channels
attribute_deprecated int channels
number of audio channels, only used for audio.
Definition: frame.h:648
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:49
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
AVFrame::channel_layout
attribute_deprecated uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:510
AV_CHANNEL_ORDER_NATIVE
@ AV_CHANNEL_ORDER_NATIVE
The native channel order, i.e.
Definition: channel_layout.h:112
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
amerge_options
static const AVOption amerge_options[]
Definition: af_amerge.c:50
ff_inlink_request_frame
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1511
s
#define s(width, name)
Definition: cbs_vp9.c:256
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_amerge.c:65
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ff_set_common_formats_from_list
int ff_set_common_formats_from_list(AVFilterContext *ctx, const int *fmts)
Equivalent to ff_set_common_formats(ctx, ff_make_format_list(fmts))
Definition: formats.c:755
activate
static int activate(AVFilterContext *ctx)
Definition: af_amerge.c:280
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AMergeContext::amerge_input::nb_ch
int nb_ch
number of channels for the input
Definition: af_amerge.c:43
AVChannelLayout::u
union AVChannelLayout::@303 u
Details about which channels are present in this layout.
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:1413
NULL
#define NULL
Definition: coverity.c:32
ff_append_inpad_free_name
int ff_append_inpad_free_name(AVFilterContext *f, AVFilterPad *p)
Definition: avfilter.c:123
AMergeContext::in
struct AMergeContext::amerge_input * in
av_channel_layout_default
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
Definition: channel_layout.c:960
inputs
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
Definition: filter_design.txt:243
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, const AVChannelLayout *channel_layout)
Definition: formats.c:466
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:1348
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
OFFSET
#define OFFSET(x)
Definition: af_amerge.c:47
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
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:290
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
bps
unsigned bps
Definition: movenc.c:1647
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
ns
#define ns(max_value, name, subs,...)
Definition: cbs_av1.c:682
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
internal.h
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:405
bprint.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
av_get_bytes_per_sample
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:108
AV_SAMPLE_FMT_U8
@ AV_SAMPLE_FMT_U8
unsigned 8 bits
Definition: samplefmt.h:57
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(amerge)
FLAGS
#define FLAGS
Definition: af_amerge.c:48
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:58
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
ff_inlink_queued_samples
int ff_inlink_queued_samples(AVFilterLink *link)
Definition: avfilter.c:1373
av_channel_layout_index_from_channel
int av_channel_layout_index_from_channel(const AVChannelLayout *channel_layout, enum AVChannel channel)
Get the index of a given channel in a channel layout.
Definition: channel_layout.c:834
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:272
copy_samples
static void copy_samples(int nb_inputs, struct amerge_input in[], int *route, uint8_t *ins[], uint8_t **outs, int ns, int bps)
Copy samples from several input streams to one output stream.
Definition: af_amerge.c:191
AVFilter
Filter definition.
Definition: avfilter.h:171
av_channel_layout_from_mask
FF_ENABLE_DEPRECATION_WARNINGS int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)
Initialize a native channel layout from a bitmask indicating which channels are present.
Definition: channel_layout.c:389
ret
ret
Definition: filter_design.txt:187
free_frames
static void free_frames(int nb_inputs, AVFrame **input_frames)
Definition: af_amerge.c:212
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
SWR_CH_MAX
#define SWR_CH_MAX
Definition: af_amerge.c:35
config_output
static int config_output(AVFilterLink *outlink)
Definition: af_amerge.c:150
channel_layout.h
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
KNOWN
#define KNOWN(l)
Definition: formats.h:111
av_channel_layout_describe
int av_channel_layout_describe(const AVChannelLayout *channel_layout, char *buf, size_t buf_size)
Get a human-readable string describing the channel layout properties.
Definition: channel_layout.c:776
AVFilterContext
An instance of a filter.
Definition: avfilter.h:408
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:82
audio.h
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:191
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
AMergeContext::nb_inputs
int nb_inputs
Definition: af_amerge.c:39
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
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:61
avstring.h
AV_SAMPLE_FMT_S32
@ AV_SAMPLE_FMT_S32
signed 32 bits
Definition: samplefmt.h:59
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition: samplefmt.h:60