aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/sink_buffer.c
blob: e34e8e204bcf7491087bccc2ad8878ba53d3e540 (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
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
/*
 * Copyright (c) 2011 Stefano Sabatini
 *
 * 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
 */

/**
 * @file
 * buffer sink
 */

#include "libavutil/avassert.h"
#include "libavutil/fifo.h"
#include "avfilter.h"
#include "buffersink.h"
#include "internal.h"

AVBufferSinkParams *av_buffersink_params_alloc(void)
{
    static const int pixel_fmts[] = { -1 };
    AVBufferSinkParams *params = av_malloc(sizeof(AVBufferSinkParams));
    if (!params)
        return NULL;

    params->pixel_fmts = pixel_fmts;
    return params;
}

AVABufferSinkParams *av_abuffersink_params_alloc(void)
{
    static const int sample_fmts[] = { -1 };
    static const int64_t channel_layouts[] = { -1 };
    AVABufferSinkParams *params = av_malloc(sizeof(AVABufferSinkParams));

    if (!params)
        return NULL;

    params->sample_fmts = sample_fmts;
    params->channel_layouts = channel_layouts;
    return params;
}

typedef struct {
    AVFifoBuffer *fifo;                      ///< FIFO buffer of video frame references
    unsigned warning_limit;

    /* only used for video */
    enum PixelFormat *pixel_fmts;           ///< list of accepted pixel formats, must be terminated with -1

    /* only used for audio */
    enum AVSampleFormat *sample_fmts;       ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
    int64_t *channel_layouts;               ///< list of accepted channel layouts, terminated by -1
} BufferSinkContext;

#define FIFO_INIT_SIZE 8

static av_cold int common_init(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;

    buf->fifo = av_fifo_alloc(FIFO_INIT_SIZE*sizeof(AVFilterBufferRef *));
    if (!buf->fifo) {
        av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");
        return AVERROR(ENOMEM);
    }
    buf->warning_limit = 100;
    return 0;
}

static av_cold void common_uninit(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;
    AVFilterBufferRef *picref;

    if (buf->fifo) {
        while (av_fifo_size(buf->fifo) >= sizeof(AVFilterBufferRef *)) {
            av_fifo_generic_read(buf->fifo, &picref, sizeof(picref), NULL);
            avfilter_unref_buffer(picref);
        }
        av_fifo_free(buf->fifo);
        buf->fifo = NULL;
    }
}

static int end_frame(AVFilterLink *inlink)
{
    AVFilterContext *ctx = inlink->dst;
    BufferSinkContext *buf = inlink->dst->priv;

    av_assert1(inlink->cur_buf);
    if (av_fifo_space(buf->fifo) < sizeof(AVFilterBufferRef *)) {
        /* realloc fifo size */
        if (av_fifo_realloc2(buf->fifo, av_fifo_size(buf->fifo) * 2) < 0) {
            av_log(ctx, AV_LOG_ERROR,
                   "Cannot buffer more frames. Consume some available frames "
                   "before adding new ones.\n");
            return AVERROR(ENOMEM);
        }
    }

    /* cache frame */
    av_fifo_generic_write(buf->fifo,
                          &inlink->cur_buf, sizeof(AVFilterBufferRef *), NULL);
    inlink->cur_buf = NULL;
    if (buf->warning_limit &&
        av_fifo_size(buf->fifo) / sizeof(AVFilterBufferRef *) >= buf->warning_limit) {
        av_log(ctx, AV_LOG_WARNING,
               "%d buffers queued in %s, something may be wrong.\n",
               buf->warning_limit,
               (char *)av_x_if_null(ctx->name, ctx->filter->name));
        buf->warning_limit *= 10;
    }
    return 0;
}

void av_buffersink_set_frame_size(AVFilterContext *ctx, unsigned frame_size)
{
    AVFilterLink *inlink = ctx->inputs[0];

    inlink->min_samples = inlink->max_samples =
    inlink->partial_buf_size = frame_size;
}

int av_buffersink_get_buffer_ref(AVFilterContext *ctx,
                                  AVFilterBufferRef **bufref, int flags)
{
    BufferSinkContext *buf = ctx->priv;
    AVFilterLink *inlink = ctx->inputs[0];
    int ret;
    *bufref = NULL;

    av_assert0(    !strcmp(ctx->filter->name, "buffersink")
                || !strcmp(ctx->filter->name, "abuffersink")
                || !strcmp(ctx->filter->name, "ffbuffersink")
                || !strcmp(ctx->filter->name, "ffabuffersink"));

    /* no picref available, fetch it from the filterchain */
    if (!av_fifo_size(buf->fifo)) {
        if (flags & AV_BUFFERSINK_FLAG_NO_REQUEST)
            return AVERROR(EAGAIN);
        if ((ret = ff_request_frame(inlink)) < 0)
            return ret;
    }

    if (!av_fifo_size(buf->fifo))
        return AVERROR(EINVAL);

    if (flags & AV_BUFFERSINK_FLAG_PEEK)
        *bufref = *((AVFilterBufferRef **)av_fifo_peek2(buf->fifo, 0));
    else
        av_fifo_generic_read(buf->fifo, bufref, sizeof(*bufref), NULL);

    return 0;
}

AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx)
{
    av_assert0(   !strcmp(ctx->filter->name, "buffersink")
               || !strcmp(ctx->filter->name, "ffbuffersink"));

    return ctx->inputs[0]->frame_rate;
}

int av_buffersink_poll_frame(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;
    AVFilterLink *inlink = ctx->inputs[0];

    av_assert0(   !strcmp(ctx->filter->name, "buffersink")
               || !strcmp(ctx->filter->name, "abuffersink")
               || !strcmp(ctx->filter->name, "ffbuffersink")
               || !strcmp(ctx->filter->name, "ffabuffersink"));

    return av_fifo_size(buf->fifo)/sizeof(AVFilterBufferRef *) + ff_poll_frame(inlink);
}

#if CONFIG_BUFFERSINK_FILTER || CONFIG_FFBUFFERSINK_FILTER

static av_cold int vsink_init(AVFilterContext *ctx, const char *args, void *opaque)
{
    BufferSinkContext *buf = ctx->priv;
    AVBufferSinkParams *params = opaque;

    if (params && params->pixel_fmts) {
        const int *pixel_fmts = params->pixel_fmts;

        buf->pixel_fmts = ff_copy_int_list(pixel_fmts);
        if (!buf->pixel_fmts)
            return AVERROR(ENOMEM);
    }

    return common_init(ctx);
}

static av_cold void vsink_uninit(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;
    av_freep(&buf->pixel_fmts);
    common_uninit(ctx);
}

static int vsink_query_formats(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;

    if (buf->pixel_fmts)
        ff_set_common_formats(ctx, ff_make_format_list(buf->pixel_fmts));
    else
        ff_default_query_formats(ctx);

    return 0;
}

AVFilter avfilter_vsink_ffbuffersink = {
    .name      = "ffbuffersink",
    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
    .priv_size = sizeof(BufferSinkContext),
    .init_opaque = vsink_init,
    .uninit    = vsink_uninit,

    .query_formats = vsink_query_formats,

    .inputs    = (const AVFilterPad[]) {{ .name    = "default",
                                    .type          = AVMEDIA_TYPE_VIDEO,
                                    .end_frame     = end_frame,
                                    .min_perms     = AV_PERM_READ | AV_PERM_PRESERVE, },
                                  { .name = NULL }},
    .outputs   = (const AVFilterPad[]) {{ .name = NULL }},
};

AVFilter avfilter_vsink_buffersink = {
    .name      = "buffersink",
    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
    .priv_size = sizeof(BufferSinkContext),
    .init_opaque = vsink_init,
    .uninit    = vsink_uninit,

    .query_formats = vsink_query_formats,

    .inputs    = (const AVFilterPad[]) {{ .name    = "default",
                                    .type          = AVMEDIA_TYPE_VIDEO,
                                    .end_frame     = end_frame,
                                    .min_perms     = AV_PERM_READ | AV_PERM_PRESERVE, },
                                  { .name = NULL }},
    .outputs   = (const AVFilterPad[]) {{ .name = NULL }},
};

#endif /* CONFIG_BUFFERSINK_FILTER */

#if CONFIG_ABUFFERSINK_FILTER || CONFIG_FFABUFFERSINK_FILTER

static int filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
    end_frame(link);
    return 0;
}

static av_cold int asink_init(AVFilterContext *ctx, const char *args, void *opaque)
{
    BufferSinkContext *buf = ctx->priv;
    AVABufferSinkParams *params = opaque;

    if (params && params->sample_fmts) {
        buf->sample_fmts     = ff_copy_int_list  (params->sample_fmts);
        if (!buf->sample_fmts)
            goto fail_enomem;
    }
    if (params && params->channel_layouts) {
        buf->channel_layouts = ff_copy_int64_list(params->channel_layouts);
        if (!buf->channel_layouts)
            goto fail_enomem;
    }
    if (!common_init(ctx))
        return 0;

fail_enomem:
    av_freep(&buf->sample_fmts);
    av_freep(&buf->channel_layouts);
    return AVERROR(ENOMEM);
}

static av_cold void asink_uninit(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;

    av_freep(&buf->sample_fmts);
    av_freep(&buf->channel_layouts);
    common_uninit(ctx);
}

static int asink_query_formats(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;
    AVFilterFormats *formats = NULL;
    AVFilterChannelLayouts *layouts = NULL;

    if (buf->sample_fmts) {
    if (!(formats = ff_make_format_list(buf->sample_fmts)))
        return AVERROR(ENOMEM);
    ff_set_common_formats(ctx, formats);
    }

    if (buf->channel_layouts) {
    if (!(layouts = avfilter_make_format64_list(buf->channel_layouts)))
        return AVERROR(ENOMEM);
    ff_set_common_channel_layouts(ctx, layouts);
    }

    return 0;
}

AVFilter avfilter_asink_ffabuffersink = {
    .name      = "ffabuffersink",
    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
    .init_opaque = asink_init,
    .uninit    = asink_uninit,
    .priv_size = sizeof(BufferSinkContext),
    .query_formats = asink_query_formats,

    .inputs    = (const AVFilterPad[]) {{ .name     = "default",
                                    .type           = AVMEDIA_TYPE_AUDIO,
                                    .filter_samples = filter_samples,
                                    .min_perms      = AV_PERM_READ | AV_PERM_PRESERVE, },
                                  { .name = NULL }},
    .outputs   = (const AVFilterPad[]) {{ .name = NULL }},
};

AVFilter avfilter_asink_abuffersink = {
    .name      = "abuffersink",
    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
    .init_opaque = asink_init,
    .uninit    = asink_uninit,
    .priv_size = sizeof(BufferSinkContext),
    .query_formats = asink_query_formats,

    .inputs    = (const AVFilterPad[]) {{ .name     = "default",
                                    .type           = AVMEDIA_TYPE_AUDIO,
                                    .filter_samples = filter_samples,
                                    .min_perms      = AV_PERM_READ | AV_PERM_PRESERVE, },
                                  { .name = NULL }},
    .outputs   = (const AVFilterPad[]) {{ .name = NULL }},
};

#endif /* CONFIG_ABUFFERSINK_FILTER */