2 * Filter layer - default implementations
3 * Copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
7 * FFmpeg 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.
12 * FFmpeg 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/audioconvert.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/samplefmt.h"
28 void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
30 av_free(ptr->data[0]);
34 /* TODO: set the buffer's priv member to a context structure for the whole
35 * filter chain. This will allow for a buffer pool instead of the constant
36 * alloc & free cycle currently implemented. */
37 AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
42 AVFilterBufferRef *picref = NULL;
43 AVFilterPool *pool= link->pool;
45 if(pool) for(i=0; i<POOL_SIZE; i++){
47 if(picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h){
48 AVFilterBuffer *pic= picref->buf;
53 picref->perms = perms | AV_PERM_READ;
54 picref->format= link->format;
56 memcpy(picref->data, pic->data, sizeof(picref->data));
57 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
62 // +2 is needed for swscaler, +16 to be SIMD-friendly
63 if ((i=av_image_alloc(data, linesize, w, h, link->format, 16)) < 0)
66 picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
67 perms, w, h, link->format);
72 memset(data[0], 128, i);
74 picref->buf->priv= link;
75 picref->buf->free= NULL;
80 AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
81 enum AVSampleFormat sample_fmt, int size,
82 int64_t channel_layout, int planar)
84 AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
85 AVFilterBufferRef *ref = NULL;
86 int i, sample_size, chans_nb, bufsize, per_channel_size, step_size = 0;
89 if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
93 ref->format = sample_fmt;
95 ref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps));
99 ref->audio->channel_layout = channel_layout;
100 ref->audio->size = size;
101 ref->audio->planar = planar;
103 /* make sure the buffer gets read permission or it's useless for output */
104 ref->perms = perms | AV_PERM_READ;
106 samples->refcount = 1;
107 samples->free = ff_avfilter_default_free_buffer;
109 sample_size = av_get_bits_per_sample_fmt(sample_fmt) >>3;
110 chans_nb = av_get_channel_layout_nb_channels(channel_layout);
112 per_channel_size = size/chans_nb;
113 ref->audio->nb_samples = per_channel_size/sample_size;
115 /* Set the number of bytes to traverse to reach next sample of a particular channel:
116 * For planar, this is simply the sample size.
117 * For packed, this is the number of samples * sample_size.
119 for (i = 0; i < chans_nb; i++)
120 samples->linesize[i] = planar > 0 ? per_channel_size : sample_size;
121 memset(&samples->linesize[chans_nb], 0, (8-chans_nb) * sizeof(samples->linesize[0]));
123 /* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
124 bufsize = (size + 15)&~15;
125 buf = av_malloc(bufsize);
129 /* For planar, set the start point of each channel's data within the buffer
130 * For packed, set the start point of the entire buffer only
132 samples->data[0] = buf;
134 for (i = 1; i < chans_nb; i++) {
135 step_size += per_channel_size;
136 samples->data[i] = buf + step_size;
139 for (i = 1; i < chans_nb; i++)
140 samples->data[i] = buf;
143 memset(&samples->data[chans_nb], 0, (8-chans_nb) * sizeof(samples->data[0]));
145 memcpy(ref->data, samples->data, sizeof(ref->data));
146 memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));
158 void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
160 AVFilterLink *outlink = NULL;
162 if (inlink->dst->output_count)
163 outlink = inlink->dst->outputs[0];
166 outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
167 avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
168 avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
172 void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
174 AVFilterLink *outlink = NULL;
176 if (inlink->dst->output_count)
177 outlink = inlink->dst->outputs[0];
180 avfilter_draw_slice(outlink, y, h, slice_dir);
183 void avfilter_default_end_frame(AVFilterLink *inlink)
185 AVFilterLink *outlink = NULL;
187 if (inlink->dst->output_count)
188 outlink = inlink->dst->outputs[0];
190 avfilter_unref_buffer(inlink->cur_buf);
191 inlink->cur_buf = NULL;
194 if (outlink->out_buf) {
195 avfilter_unref_buffer(outlink->out_buf);
196 outlink->out_buf = NULL;
198 avfilter_end_frame(outlink);
202 /* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
203 void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
205 AVFilterLink *outlink = NULL;
207 if (inlink->dst->output_count)
208 outlink = inlink->dst->outputs[0];
211 outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE, samplesref->format,
212 samplesref->audio->size,
213 samplesref->audio->channel_layout,
214 samplesref->audio->planar);
215 outlink->out_buf->pts = samplesref->pts;
216 outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
217 avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
218 avfilter_unref_buffer(outlink->out_buf);
219 outlink->out_buf = NULL;
221 avfilter_unref_buffer(samplesref);
222 inlink->cur_buf = NULL;
226 * default config_link() implementation for output video links to simplify
227 * the implementation of one input one output video filters */
228 int avfilter_default_config_output_link(AVFilterLink *link)
230 if (link->src->input_count && link->src->inputs[0]) {
231 if (link->type == AVMEDIA_TYPE_VIDEO) {
232 link->w = link->src->inputs[0]->w;
233 link->h = link->src->inputs[0]->h;
234 link->time_base = link->src->inputs[0]->time_base;
235 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
236 link->channel_layout = link->src->inputs[0]->channel_layout;
237 link->sample_rate = link->src->inputs[0]->sample_rate;
240 /* XXX: any non-simple filter which would cause this branch to be taken
241 * really should implement its own config_props() for this link. */
249 * A helper for query_formats() which sets all links to the same list of
250 * formats. If there are no links hooked to this filter, the list of formats is
253 * FIXME: this will need changed for filters with a mix of pad types
254 * (video + audio, etc)
256 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
260 for (i = 0; i < ctx->input_count; i++) {
261 if (ctx->inputs[i]) {
262 avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
266 for (i = 0; i < ctx->output_count; i++) {
267 if (ctx->outputs[i]) {
268 avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
274 av_free(formats->formats);
275 av_free(formats->refs);
280 int avfilter_default_query_formats(AVFilterContext *ctx)
282 enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
283 ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
286 avfilter_set_common_formats(ctx, avfilter_all_formats(type));
290 void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
292 avfilter_start_frame(link->dst->outputs[0], picref);
295 void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
297 avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
300 void avfilter_null_end_frame(AVFilterLink *link)
302 avfilter_end_frame(link->dst->outputs[0]);
305 void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
307 avfilter_filter_samples(link->dst->outputs[0], samplesref);
310 AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
312 return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
315 AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
316 enum AVSampleFormat sample_fmt, int size,
317 int64_t channel_layout, int packed)
319 return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,
320 size, channel_layout, packed);