summaryrefslogtreecommitdiffstats
path: root/libavfilter/buffersink.c
blob: 94e73669559a5400d0406673d52c7eb152f0587c (plain)
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
/*
 * Copyright (c) 2011 Stefano Sabatini
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; 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/mathematics.h"

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

typedef struct {
    AVFrame *cur_frame;          ///< last frame delivered on the sink
    AVAudioFifo  *audio_fifo;    ///< FIFO for audio samples
    int64_t next_pts;            ///< interpolating audio pts
} BufferSinkContext;

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

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

static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
    BufferSinkContext *s = link->dst->priv;

    av_assert0(!s->cur_frame);
    s->cur_frame = frame;

    return 0;
}

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

    if ((ret = ff_request_frame(link)) < 0)
        return ret;

    if (!s->cur_frame)
        return AVERROR(EINVAL);

    av_frame_move_ref(frame, s->cur_frame);
    av_frame_free(&s->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;
    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];
    int ret = 0;

    if (!s->audio_fifo) {
        int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
        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);

        ret = ff_request_frame(link);
        if (ret == AVERROR_EOF && av_audio_fifo_size(s->audio_fifo))
            return read_from_fifo(ctx, frame, av_audio_fifo_size(s->audio_fifo));
        else if (ret < 0)
            return ret;

        if (s->cur_frame->pts != AV_NOPTS_VALUE) {
            s->next_pts = s->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**)s->cur_frame->extended_data,
                                  s->cur_frame->nb_samples);
        av_frame_free(&s->cur_frame);
    }

    return ret;

}

#if FF_API_AVFILTERBUFFER
static void compat_free_buffer(AVFilterBuffer *buf)
{
    AVFrame *frame = buf->priv;
    av_frame_free(&frame);
    av_free(buf);
}

static int attribute_align_arg compat_read(AVFilterContext *ctx,
                                           AVFilterBufferRef **pbuf, int nb_samples)
{
    AVFilterBufferRef *buf;
    AVFrame *frame;
    int ret;

    if (!pbuf)
        return ff_poll_frame(ctx->inputs[0]);

    frame = av_frame_alloc();
    if (!frame)
        return AVERROR(ENOMEM);

    if (!nb_samples)
        ret = av_buffersink_get_frame(ctx, frame);
    else
        ret = av_buffersink_get_samples(ctx, frame, nb_samples);

    if (ret < 0)
        goto fail;

    if (ctx->inputs[0]->type == AVMEDIA_TYPE_VIDEO) {
        buf = avfilter_get_video_buffer_ref_from_arrays(frame->data, frame->linesize,
                                                        AV_PERM_READ,
                                                        frame->width, frame->height,
                                                        frame->format);
    } else {
        buf = avfilter_get_audio_buffer_ref_from_arrays(frame->extended_data,
                                                        frame->linesize[0], AV_PERM_READ,
                                                        frame->nb_samples,
                                                        frame->format,
                                                        frame->channel_layout);
    }
    if (!buf) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    avfilter_copy_frame_props(buf, frame);

    buf->buf->priv = frame;
    buf->buf->free = compat_free_buffer;

    *pbuf = buf;

    return 0;
fail:
    av_frame_free(&frame);
    return ret;
}

int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
{
    return compat_read(ctx, buf, 0);
}

int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
                               int nb_samples)
{
    return compat_read(ctx, buf, nb_samples);
}
#endif

static const AVFilterPad avfilter_vsink_buffer_inputs[] = {
    {
        .name        = "default",
        .type        = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
        .needs_fifo  = 1
    },
    { NULL }
};

AVFilter avfilter_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),
    .uninit    = uninit,

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

static const AVFilterPad avfilter_asink_abuffer_inputs[] = {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = filter_frame,
        .needs_fifo     = 1
    },
    { NULL }
};

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

    .inputs    = avfilter_asink_abuffer_inputs,
    .outputs   = NULL,
};
OpenPOWER on IntegriCloud