defaults.c
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1 /*
2  * Filter layer - default implementations
3  * Copyright (c) 2007 Bobby Bingham
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/audioconvert.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/samplefmt.h"
25 #include "avfilter.h"
26 #include "internal.h"
27 
28 /* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
30 {
31  av_free(ptr->data[0]);
32  av_free(ptr);
33 }
34 
35 /* TODO: set the buffer's priv member to a context structure for the whole
36  * filter chain. This will allow for a buffer pool instead of the constant
37  * alloc & free cycle currently implemented. */
39 {
40  int linesize[4];
41  uint8_t *data[4];
42  AVFilterBufferRef *picref = NULL;
43 
44  // +2 is needed for swscaler, +16 to be SIMD-friendly
45  if (av_image_alloc(data, linesize, w, h, link->format, 16) < 0)
46  return NULL;
47 
48  picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
49  perms, w, h, link->format);
50  if (!picref) {
51  av_free(data[0]);
52  return NULL;
53  }
54 
55  return picref;
56 }
57 
59  enum AVSampleFormat sample_fmt, int size,
60  uint64_t channel_layout, int planar)
61 {
63  AVFilterBufferRef *ref = NULL;
64  int i, sample_size, chans_nb, bufsize, per_channel_size, step_size = 0;
65  char *buf;
66 
67  if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
68  goto fail;
69 
70  ref->buf = samples;
71  ref->format = sample_fmt;
72 
74  if (!ref->audio)
75  goto fail;
76 
77  ref->audio->channel_layout = channel_layout;
78  ref->audio->size = size;
79  ref->audio->planar = planar;
80 
81  /* make sure the buffer gets read permission or it's useless for output */
82  ref->perms = perms | AV_PERM_READ;
83 
84  samples->refcount = 1;
86 
87  sample_size = av_get_bytes_per_sample(sample_fmt);
88  chans_nb = av_get_channel_layout_nb_channels(channel_layout);
89 
90  per_channel_size = size/chans_nb;
91  ref->audio->nb_samples = per_channel_size/sample_size;
92 
93  /* Set the number of bytes to traverse to reach next sample of a particular channel:
94  * For planar, this is simply the sample size.
95  * For packed, this is the number of samples * sample_size.
96  */
97  for (i = 0; i < chans_nb; i++)
98  samples->linesize[i] = planar > 0 ? per_channel_size : sample_size;
99  memset(&samples->linesize[chans_nb], 0, (8-chans_nb) * sizeof(samples->linesize[0]));
100 
101  /* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
102  bufsize = (size + 15)&~15;
103  buf = av_malloc(bufsize);
104  if (!buf)
105  goto fail;
106 
107  /* For planar, set the start point of each channel's data within the buffer
108  * For packed, set the start point of the entire buffer only
109  */
110  samples->data[0] = buf;
111  if (buf && planar) {
112  for (i = 1; i < chans_nb; i++) {
113  step_size += per_channel_size;
114  samples->data[i] = buf + step_size;
115  }
116  } else {
117  for (i = 1; i < chans_nb; i++)
118  samples->data[i] = buf;
119  }
120 
121  memset(&samples->data[chans_nb], 0, (8-chans_nb) * sizeof(samples->data[0]));
122 
123  memcpy(ref->data, samples->data, sizeof(ref->data));
124  memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));
125 
126  return ref;
127 
128 fail:
129  if (ref)
130  av_free(ref->audio);
131  av_free(ref);
132  av_free(samples);
133  return NULL;
134 }
135 
137 {
138  AVFilterLink *outlink = NULL;
139 
140  if (inlink->dst->output_count)
141  outlink = inlink->dst->outputs[0];
142 
143  if (outlink) {
144  outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
145  avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
146  avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
147  }
148 }
149 
150 void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
151 {
152  AVFilterLink *outlink = NULL;
153 
154  if (inlink->dst->output_count)
155  outlink = inlink->dst->outputs[0];
156 
157  if (outlink)
158  avfilter_draw_slice(outlink, y, h, slice_dir);
159 }
160 
162 {
163  AVFilterLink *outlink = NULL;
164 
165  if (inlink->dst->output_count)
166  outlink = inlink->dst->outputs[0];
167 
169  inlink->cur_buf = NULL;
170 
171  if (outlink) {
172  if (outlink->out_buf) {
173  avfilter_unref_buffer(outlink->out_buf);
174  outlink->out_buf = NULL;
175  }
176  avfilter_end_frame(outlink);
177  }
178 }
179 
180 /* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
182 {
183  AVFilterLink *outlink = NULL;
184 
185  if (inlink->dst->output_count)
186  outlink = inlink->dst->outputs[0];
187 
188  if (outlink) {
189  outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE, samplesref->format,
190  samplesref->audio->size,
191  samplesref->audio->channel_layout,
192  samplesref->audio->planar);
193  outlink->out_buf->pts = samplesref->pts;
194  outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
195  avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
196  avfilter_unref_buffer(outlink->out_buf);
197  outlink->out_buf = NULL;
198  }
199  avfilter_unref_buffer(samplesref);
200  inlink->cur_buf = NULL;
201 }
202 
207 {
208  if (link->src->input_count && link->src->inputs[0]) {
209  if (link->type == AVMEDIA_TYPE_VIDEO) {
210  link->w = link->src->inputs[0]->w;
211  link->h = link->src->inputs[0]->h;
212  link->time_base = link->src->inputs[0]->time_base;
213  } else if (link->type == AVMEDIA_TYPE_AUDIO) {
214  link->channel_layout = link->src->inputs[0]->channel_layout;
215  link->sample_rate = link->src->inputs[0]->sample_rate;
216  }
217  } else {
218  /* XXX: any non-simple filter which would cause this branch to be taken
219  * really should implement its own config_props() for this link. */
220  return -1;
221  }
222 
223  return 0;
224 }
225 
235 {
236  int count = 0, i;
237 
238  for (i = 0; i < ctx->input_count; i++) {
239  if (ctx->inputs[i]) {
240  avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
241  count++;
242  }
243  }
244  for (i = 0; i < ctx->output_count; i++) {
245  if (ctx->outputs[i]) {
246  avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
247  count++;
248  }
249  }
250 
251  if (!count) {
252  av_free(formats->formats);
253  av_free(formats->refs);
254  av_free(formats);
255  }
256 }
257 
259 {
260  enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
261  ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
263 
265  return 0;
266 }
267 
269 {
270  avfilter_start_frame(link->dst->outputs[0], picref);
271 }
272 
273 void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
274 {
275  avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
276 }
277 
279 {
280  avfilter_end_frame(link->dst->outputs[0]);
281 }
282 
284 {
285  avfilter_filter_samples(link->dst->outputs[0], samplesref);
286 }
287 
289 {
290  return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
291 }
292 
294  enum AVSampleFormat sample_fmt, int size,
295  uint64_t channel_layout, int packed)
296 {
297  return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,
298  size, channel_layout, packed);
299 }
300