aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/defaults.c
blob: ef798ddd8d4c3d1adfc6ab2281a3601acb247639 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
/*
 * Filter layer - default implementations
 * Copyright (c) 2007 Bobby Bingham
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/audioconvert.h"
#include "libavutil/imgutils.h"
#include "libavutil/samplefmt.h"
#include "avfilter.h"
#include "internal.h"

void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
{
    av_free(ptr->data[0]);
    av_free(ptr);
}

/* TODO: set the buffer's priv member to a context structure for the whole
 * filter chain.  This will allow for a buffer pool instead of the constant
 * alloc & free cycle currently implemented. */
AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
    int linesize[4];
    uint8_t *data[4];
    int i;
    AVFilterBufferRef *picref = NULL;
    AVFilterPool *pool= link->pool;

    if(pool) for(i=0; i<POOL_SIZE; i++){
        picref= pool->pic[i];
        if(picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h){
            AVFilterBuffer *pic= picref->buf;
            pool->pic[i]= NULL;
            pool->count--;
            picref->video->w = w;
            picref->video->h = h;
            picref->perms = perms | AV_PERM_READ;
            picref->format= link->format;
            pic->refcount = 1;
            memcpy(picref->data,     pic->data,     sizeof(picref->data));
            memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
            return picref;
        }
    }

    // +2 is needed for swscaler, +16 to be SIMD-friendly
    if (av_image_alloc(data, linesize, w, h, link->format, 16) < 0)
        return NULL;

    picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
                                                       perms, w, h, link->format);
    if (!picref) {
        av_free(data[0]);
        return NULL;
    }
    picref->buf->priv= link;
    picref->buf->free= NULL;

    return picref;
}

AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
                                                     enum AVSampleFormat sample_fmt, int size,
                                                     int64_t channel_layout, int planar)
{
    AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
    AVFilterBufferRef *ref = NULL;
    int i, sample_size, chans_nb, bufsize, per_channel_size, step_size = 0;
    char *buf;

    if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
        goto fail;

    ref->buf                   = samples;
    ref->format                = sample_fmt;

    ref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps));
    if (!ref->audio)
        goto fail;

    ref->audio->channel_layout = channel_layout;
    ref->audio->size           = size;
    ref->audio->planar         = planar;

    /* make sure the buffer gets read permission or it's useless for output */
    ref->perms = perms | AV_PERM_READ;

    samples->refcount   = 1;
    samples->free       = ff_avfilter_default_free_buffer;

    sample_size = av_get_bits_per_sample_fmt(sample_fmt) >>3;
    chans_nb = av_get_channel_layout_nb_channels(channel_layout);

    per_channel_size = size/chans_nb;
    ref->audio->nb_samples = per_channel_size/sample_size;

    /* Set the number of bytes to traverse to reach next sample of a particular channel:
     * For planar, this is simply the sample size.
     * For packed, this is the number of samples * sample_size.
     */
    for (i = 0; i < chans_nb; i++)
        samples->linesize[i] = planar > 0 ? per_channel_size : sample_size;
    memset(&samples->linesize[chans_nb], 0, (8-chans_nb) * sizeof(samples->linesize[0]));

    /* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
    bufsize = (size + 15)&~15;
    buf = av_malloc(bufsize);
    if (!buf)
        goto fail;

    /* For planar, set the start point of each channel's data within the buffer
     * For packed, set the start point of the entire buffer only
     */
    samples->data[0] = buf;
    if (buf && planar) {
        for (i = 1; i < chans_nb; i++) {
            step_size += per_channel_size;
            samples->data[i] = buf + step_size;
        }
    } else {
        for (i = 1; i < chans_nb; i++)
            samples->data[i] = buf;
    }

    memset(&samples->data[chans_nb], 0, (8-chans_nb) * sizeof(samples->data[0]));

    memcpy(ref->data,     samples->data,     sizeof(ref->data));
    memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));

    return ref;

fail:
    if (ref)
        av_free(ref->audio);
    av_free(ref);
    av_free(samples);
    return NULL;
}

void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
{
    AVFilterLink *outlink = NULL;

    if (inlink->dst->output_count)
        outlink = inlink->dst->outputs[0];

    if (outlink) {
        outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
        avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
        avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
    }
}

void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
    AVFilterLink *outlink = NULL;

    if (inlink->dst->output_count)
        outlink = inlink->dst->outputs[0];

    if (outlink)
        avfilter_draw_slice(outlink, y, h, slice_dir);
}

void avfilter_default_end_frame(AVFilterLink *inlink)
{
    AVFilterLink *outlink = NULL;

    if (inlink->dst->output_count)
        outlink = inlink->dst->outputs[0];

    avfilter_unref_buffer(inlink->cur_buf);
    inlink->cur_buf = NULL;

    if (outlink) {
        if (outlink->out_buf) {
            avfilter_unref_buffer(outlink->out_buf);
            outlink->out_buf = NULL;
        }
        avfilter_end_frame(outlink);
    }
}

/* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
{
    AVFilterLink *outlink = NULL;

    if (inlink->dst->output_count)
        outlink = inlink->dst->outputs[0];

    if (outlink) {
        outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE, samplesref->format,
                                                             samplesref->audio->size,
                                                             samplesref->audio->channel_layout,
                                                             samplesref->audio->planar);
        outlink->out_buf->pts                = samplesref->pts;
        outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
        avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
        avfilter_unref_buffer(outlink->out_buf);
        outlink->out_buf = NULL;
    }
    avfilter_unref_buffer(samplesref);
    inlink->cur_buf = NULL;
}

/**
 * default config_link() implementation for output video links to simplify
 * the implementation of one input one output video filters */
int avfilter_default_config_output_link(AVFilterLink *link)
{
    if (link->src->input_count && link->src->inputs[0]) {
        if (link->type == AVMEDIA_TYPE_VIDEO) {
            link->w = link->src->inputs[0]->w;
            link->h = link->src->inputs[0]->h;
            link->time_base = link->src->inputs[0]->time_base;
        } else if (link->type == AVMEDIA_TYPE_AUDIO) {
            link->channel_layout = link->src->inputs[0]->channel_layout;
            link->sample_rate    = link->src->inputs[0]->sample_rate;
        }
    } else {
        /* XXX: any non-simple filter which would cause this branch to be taken
         * really should implement its own config_props() for this link. */
        return -1;
    }

    return 0;
}

/**
 * A helper for query_formats() which sets all links to the same list of
 * formats. If there are no links hooked to this filter, the list of formats is
 * freed.
 *
 * FIXME: this will need changed for filters with a mix of pad types
 * (video + audio, etc)
 */
void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
{
    int count = 0, i;

    for (i = 0; i < ctx->input_count; i++) {
        if (ctx->inputs[i]) {
            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
            count++;
        }
    }
    for (i = 0; i < ctx->output_count; i++) {
        if (ctx->outputs[i]) {
            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
            count++;
        }
    }

    if (!count) {
        av_free(formats->formats);
        av_free(formats->refs);
        av_free(formats);
    }
}

int avfilter_default_query_formats(AVFilterContext *ctx)
{
    enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
                            ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
                            AVMEDIA_TYPE_VIDEO;

    avfilter_set_common_formats(ctx, avfilter_all_formats(type));
    return 0;
}

void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
    avfilter_start_frame(link->dst->outputs[0], picref);
}

void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
}

void avfilter_null_end_frame(AVFilterLink *link)
{
    avfilter_end_frame(link->dst->outputs[0]);
}

void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
    avfilter_filter_samples(link->dst->outputs[0], samplesref);
}

AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
}

AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
                                                  enum AVSampleFormat sample_fmt, int size,
                                                  int64_t channel_layout, int packed)
{
    return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,
                                     size, channel_layout, packed);
}