aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/buffersink.c
blob: e693161554caa24dfdd9dc7ec07c8de8801e4240 (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
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
/*
 * 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/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"

#include "audio.h"
#include "avfilter.h"
#include "buffersink.h"
#include "internal.h"

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

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

    /* only used for audio */
    enum AVSampleFormat *sample_fmts;       ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
    int sample_fmts_size;
    int64_t *channel_layouts;               ///< list of accepted channel layouts, terminated by -1
    int channel_layouts_size;
    int *channel_counts;                    ///< list of accepted channel counts, terminated by -1
    int channel_counts_size;
    int all_channel_counts;
    int *sample_rates;                      ///< list of accepted sample rates, terminated by -1
    int sample_rates_size;

    /* only used for compat API */
    AVAudioFifo *audio_fifo;     ///< FIFO for audio samples
    int64_t next_pts;            ///< interpolating audio pts
} BufferSinkContext;

#define NB_ITEMS(list) (list ## _size / sizeof(*list))
#define FIFO_INIT_SIZE 8
#define FIFO_INIT_ELEMENT_SIZE sizeof(void *)

static av_cold void uninit(AVFilterContext *ctx)
{
    BufferSinkContext *sink = ctx->priv;
    AVFrame *frame;

    if (sink->audio_fifo)
        av_audio_fifo_free(sink->audio_fifo);

    if (sink->fifo) {
        while (av_fifo_size(sink->fifo) >= FIFO_INIT_ELEMENT_SIZE) {
            av_fifo_generic_read(sink->fifo, &frame, sizeof(frame), NULL);
            av_frame_free(&frame);
        }
        av_fifo_freep(&sink->fifo);
    }
}

static int add_buffer_ref(AVFilterContext *ctx, AVFrame *ref)
{
    BufferSinkContext *buf = ctx->priv;

    if (av_fifo_space(buf->fifo) < FIFO_INIT_ELEMENT_SIZE) {
        /* 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, &ref, FIFO_INIT_ELEMENT_SIZE, NULL);
    return 0;
}

static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
    AVFilterContext *ctx = link->dst;
    BufferSinkContext *buf = link->dst->priv;
    int ret;

    if ((ret = add_buffer_ref(ctx, frame)) < 0)
        return ret;
    if (buf->warning_limit &&
        av_fifo_size(buf->fifo) / FIFO_INIT_ELEMENT_SIZE >= 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;
}

int attribute_align_arg av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
{
    return av_buffersink_get_frame_flags(ctx, frame, 0);
}

int attribute_align_arg av_buffersink_get_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
{
    BufferSinkContext *buf = ctx->priv;
    AVFilterLink *inlink = ctx->inputs[0];
    int ret;
    AVFrame *cur_frame;

    /* no picref available, fetch it from the filterchain */
    if (!av_fifo_size(buf->fifo)) {
        if (inlink->closed)
            return AVERROR_EOF;
        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) {
        cur_frame = *((AVFrame **)av_fifo_peek2(buf->fifo, 0));
        if ((ret = av_frame_ref(frame, cur_frame)) < 0)
            return ret;
    } else {
        av_fifo_generic_read(buf->fifo, &cur_frame, sizeof(cur_frame), NULL);
        av_frame_move_ref(frame, cur_frame);
        av_frame_free(&cur_frame);
    }

    return 0;
}

static int read_from_fifo(AVFilterContext *ctx, AVFrame *frame,
                          int nb_samples)
{
    BufferSinkContext *s = ctx->priv;
    AVFilterLink   *link = ctx->inputs[0];
    AVFrame *tmp;

    if (!(tmp = ff_get_audio_buffer(link, nb_samples)))
        return AVERROR(ENOMEM);
    av_audio_fifo_read(s->audio_fifo, (void**)tmp->extended_data, nb_samples);

    tmp->pts = s->next_pts;
    if (s->next_pts != AV_NOPTS_VALUE)
        s->next_pts += av_rescale_q(nb_samples, (AVRational){1, link->sample_rate},
                                    link->time_base);

    av_frame_move_ref(frame, tmp);
    av_frame_free(&tmp);

    return 0;
}

int attribute_align_arg av_buffersink_get_samples(AVFilterContext *ctx,
                                                  AVFrame *frame, int nb_samples)
{
    BufferSinkContext *s = ctx->priv;
    AVFilterLink   *link = ctx->inputs[0];
    AVFrame *cur_frame;
    int ret = 0;

    if (!s->audio_fifo) {
        int nb_channels = link->channels;
        if (!(s->audio_fifo = av_audio_fifo_alloc(link->format, nb_channels, nb_samples)))
            return AVERROR(ENOMEM);
    }

    while (ret >= 0) {
        if (av_audio_fifo_size(s->audio_fifo) >= nb_samples)
            return read_from_fifo(ctx, frame, nb_samples);

        if (!(cur_frame = av_frame_alloc()))
            return AVERROR(ENOMEM);
        ret = av_buffersink_get_frame_flags(ctx, cur_frame, 0);
        if (ret == AVERROR_EOF && av_audio_fifo_size(s->audio_fifo)) {
            av_frame_free(&cur_frame);
            return read_from_fifo(ctx, frame, av_audio_fifo_size(s->audio_fifo));
        } else if (ret < 0) {
            av_frame_free(&cur_frame);
            return ret;
        }

        if (cur_frame->pts != AV_NOPTS_VALUE) {
            s->next_pts = cur_frame->pts -
                          av_rescale_q(av_audio_fifo_size(s->audio_fifo),
                                       (AVRational){ 1, link->sample_rate },
                                       link->time_base);
        }

        ret = av_audio_fifo_write(s->audio_fifo, (void**)cur_frame->extended_data,
                                  cur_frame->nb_samples);
        av_frame_free(&cur_frame);
    }

    return ret;
}

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

    params->pixel_fmts = pixel_fmts;
    return params;
}

AVABufferSinkParams *av_abuffersink_params_alloc(void)
{
    AVABufferSinkParams *params = av_mallocz(sizeof(AVABufferSinkParams));

    if (!params)
        return NULL;
    return params;
}

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

    buf->fifo = av_fifo_alloc_array(FIFO_INIT_SIZE, FIFO_INIT_ELEMENT_SIZE);
    if (!buf->fifo) {
        av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");
        return AVERROR(ENOMEM);
    }
    buf->warning_limit = 100;
    buf->next_pts = AV_NOPTS_VALUE;
    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;
}

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;
}

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

    if (params) {
        if ((ret = av_opt_set_int_list(buf, "pix_fmts", params->pixel_fmts, AV_PIX_FMT_NONE, 0)) < 0)
            return ret;
    }

    return common_init(ctx);
}

#define CHECK_LIST_SIZE(field) \
        if (buf->field ## _size % sizeof(*buf->field)) { \
            av_log(ctx, AV_LOG_ERROR, "Invalid size for " #field ": %d, " \
                   "should be multiple of %d\n", \
                   buf->field ## _size, (int)sizeof(*buf->field)); \
            return AVERROR(EINVAL); \
        }
static int vsink_query_formats(AVFilterContext *ctx)
{
    BufferSinkContext *buf = ctx->priv;
    AVFilterFormats *formats = NULL;
    unsigned i;
    int ret;

    CHECK_LIST_SIZE(pixel_fmts)
    if (buf->pixel_fmts_size) {
        for (i = 0; i < NB_ITEMS(buf->pixel_fmts); i++)
            if ((ret = ff_add_format(&formats, buf->pixel_fmts[i])) < 0) {
                ff_formats_unref(&formats);
                return ret;
            }
        ff_set_common_formats(ctx, formats);
    } else {
        ff_default_query_formats(ctx);
    }

    return 0;
}

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

    if (params) {
        if ((ret = av_opt_set_int_list(buf, "sample_fmts",     params->sample_fmts,  AV_SAMPLE_FMT_NONE, 0)) < 0 ||
            (ret = av_opt_set_int_list(buf, "sample_rates",    params->sample_rates,    -1, 0)) < 0 ||
            (ret = av_opt_set_int_list(buf, "channel_layouts", params->channel_layouts, -1, 0)) < 0 ||
            (ret = av_opt_set_int_list(buf, "channel_counts",  params->channel_counts,  -1, 0)) < 0 ||
            (ret = av_opt_set_int(buf, "all_channel_counts", params->all_channel_counts, 0)) < 0)
            return ret;
    }
    return common_init(ctx);
}

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

    CHECK_LIST_SIZE(sample_fmts)
    CHECK_LIST_SIZE(sample_rates)
    CHECK_LIST_SIZE(channel_layouts)
    CHECK_LIST_SIZE(channel_counts)

    if (buf->sample_fmts_size) {
        for (i = 0; i < NB_ITEMS(buf->sample_fmts); i++)
            if ((ret = ff_add_format(&formats, buf->sample_fmts[i])) < 0) {
                ff_formats_unref(&formats);
                return ret;
            }
        ff_set_common_formats(ctx, formats);
    }

    if (buf->channel_layouts_size || buf->channel_counts_size ||
        buf->all_channel_counts) {
        for (i = 0; i < NB_ITEMS(buf->channel_layouts); i++)
            if ((ret = ff_add_channel_layout(&layouts, buf->channel_layouts[i])) < 0) {
                ff_channel_layouts_unref(&layouts);
                return ret;
            }
        for (i = 0; i < NB_ITEMS(buf->channel_counts); i++)
            if ((ret = ff_add_channel_layout(&layouts, FF_COUNT2LAYOUT(buf->channel_counts[i]))) < 0) {
                ff_channel_layouts_unref(&layouts);
                return ret;
            }
        if (buf->all_channel_counts) {
            if (layouts)
                av_log(ctx, AV_LOG_WARNING,
                       "Conflicting all_channel_counts and list in options\n");
            else if (!(layouts = ff_all_channel_counts()))
                return AVERROR(ENOMEM);
        }
        ff_set_common_channel_layouts(ctx, layouts);
    }

    if (buf->sample_rates_size) {
        formats = NULL;
        for (i = 0; i < NB_ITEMS(buf->sample_rates); i++)
            if ((ret = ff_add_format(&formats, buf->sample_rates[i])) < 0) {
                ff_formats_unref(&formats);
                return ret;
            }
        ff_set_common_samplerates(ctx, formats);
    }

    return 0;
}

#define OFFSET(x) offsetof(BufferSinkContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption buffersink_options[] = {
    { "pix_fmts", "set the supported pixel formats", OFFSET(pixel_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
    { NULL },
};
#undef FLAGS
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption abuffersink_options[] = {
    { "sample_fmts",     "set the supported sample formats",  OFFSET(sample_fmts),     AV_OPT_TYPE_BINARY, .flags = FLAGS },
    { "sample_rates",    "set the supported sample rates",    OFFSET(sample_rates),    AV_OPT_TYPE_BINARY, .flags = FLAGS },
    { "channel_layouts", "set the supported channel layouts", OFFSET(channel_layouts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
    { "channel_counts",  "set the supported channel counts",  OFFSET(channel_counts),  AV_OPT_TYPE_BINARY, .flags = FLAGS },
    { "all_channel_counts", "accept all channel counts", OFFSET(all_channel_counts), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
    { NULL },
};
#undef FLAGS

AVFILTER_DEFINE_CLASS(buffersink);
AVFILTER_DEFINE_CLASS(abuffersink);

static const AVFilterPad avfilter_vsink_buffer_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
    },
    { NULL }
};

AVFilter ff_vsink_buffer = {
    .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),
    .priv_class  = &buffersink_class,
    .init_opaque = vsink_init,
    .uninit      = uninit,

    .query_formats = vsink_query_formats,
    .inputs      = avfilter_vsink_buffer_inputs,
    .outputs     = NULL,
};

static const AVFilterPad avfilter_asink_abuffer_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
    },
    { NULL }
};

AVFilter ff_asink_abuffer = {
    .name        = "abuffersink",
    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
    .priv_class  = &abuffersink_class,
    .priv_size   = sizeof(BufferSinkContext),
    .init_opaque = asink_init,
    .uninit      = uninit,

    .query_formats = asink_query_formats,
    .inputs      = avfilter_asink_abuffer_inputs,
    .outputs     = NULL,
};