GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/af_amerge.c Lines: 124 164 75.6 %
Date: 2020-10-23 17:01:47 Branches: 73 106 68.9 %

Line Branch Exec Source
1
/*
2
 * Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org>
3
 *
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 * This file is part of FFmpeg.
5
 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
20
21
/**
22
 * @file
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 * Audio merging filter
24
 */
25
26
#include "libavutil/avstring.h"
27
#include "libavutil/bprint.h"
28
#include "libavutil/channel_layout.h"
29
#include "libavutil/opt.h"
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#include "avfilter.h"
31
#include "filters.h"
32
#include "audio.h"
33
#include "internal.h"
34
35
#define SWR_CH_MAX 64
36
37
typedef struct AMergeContext {
38
    const AVClass *class;
39
    int nb_inputs;
40
    int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */
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    int bps;
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    struct amerge_input {
43
        int nb_ch;         /**< number of channels for the input */
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    } *in;
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} AMergeContext;
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47
#define OFFSET(x) offsetof(AMergeContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
49
50
static const AVOption amerge_options[] = {
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    { "inputs", "specify the number of inputs", OFFSET(nb_inputs),
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      AV_OPT_TYPE_INT, { .i64 = 2 }, 1, SWR_CH_MAX, FLAGS },
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    { NULL }
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};
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56
AVFILTER_DEFINE_CLASS(amerge);
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58
2
static av_cold void uninit(AVFilterContext *ctx)
59
{
60
2
    AMergeContext *s = ctx->priv;
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62
2
    av_freep(&s->in);
63
6
    for (unsigned i = 0; i < ctx->nb_inputs; i++)
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4
        av_freep(&ctx->input_pads[i].name);
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2
}
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67
2
static int query_formats(AVFilterContext *ctx)
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{
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    static const enum AVSampleFormat packed_sample_fmts[] = {
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        AV_SAMPLE_FMT_U8,
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        AV_SAMPLE_FMT_S16,
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        AV_SAMPLE_FMT_S32,
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        AV_SAMPLE_FMT_FLT,
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        AV_SAMPLE_FMT_DBL,
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        AV_SAMPLE_FMT_NONE
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    };
77
2
    AMergeContext *s = ctx->priv;
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2
    int64_t inlayout[SWR_CH_MAX], outlayout = 0;
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    AVFilterFormats *formats;
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    AVFilterChannelLayouts *layouts;
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2
    int i, ret, overlap = 0, nb_ch = 0;
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83
4
    for (i = 0; i < s->nb_inputs; i++) {
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3
        if (!ctx->inputs[i]->incfg.channel_layouts ||
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2
            !ctx->inputs[i]->incfg.channel_layouts->nb_channel_layouts) {
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1
            av_log(ctx, AV_LOG_WARNING,
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                   "No channel layout for input %d\n", i + 1);
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1
            return AVERROR(EAGAIN);
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        }
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2
        inlayout[i] = ctx->inputs[i]->incfg.channel_layouts->channel_layouts[0];
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2
        if (ctx->inputs[i]->incfg.channel_layouts->nb_channel_layouts > 1) {
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            char buf[256];
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            av_get_channel_layout_string(buf, sizeof(buf), 0, inlayout[i]);
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            av_log(ctx, AV_LOG_INFO, "Using \"%s\" for input %d\n", buf, i + 1);
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        }
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2
        s->in[i].nb_ch = FF_LAYOUT2COUNT(inlayout[i]);
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2
        if (s->in[i].nb_ch) {
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            overlap++;
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        } else {
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2
            s->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]);
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2
            if (outlayout & inlayout[i])
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1
                overlap++;
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2
            outlayout |= inlayout[i];
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        }
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2
        nb_ch += s->in[i].nb_ch;
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    }
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1
    if (nb_ch > SWR_CH_MAX) {
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        av_log(ctx, AV_LOG_ERROR, "Too many channels (max %d)\n", SWR_CH_MAX);
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        return AVERROR(EINVAL);
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    }
111
1
    if (overlap) {
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1
        av_log(ctx, AV_LOG_WARNING,
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               "Input channel layouts overlap: "
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               "output layout will be determined by the number of distinct input channels\n");
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3
        for (i = 0; i < nb_ch; i++)
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2
            s->route[i] = i;
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1
        outlayout = av_get_default_channel_layout(nb_ch);
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1
        if (!outlayout && nb_ch)
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            outlayout = 0xFFFFFFFFFFFFFFFFULL >> (64 - nb_ch);
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    } else {
121
        int *route[SWR_CH_MAX];
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        int c, out_ch_number = 0;
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124
        route[0] = s->route;
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        for (i = 1; i < s->nb_inputs; i++)
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            route[i] = route[i - 1] + s->in[i - 1].nb_ch;
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        for (c = 0; c < 64; c++)
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            for (i = 0; i < s->nb_inputs; i++)
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                if ((inlayout[i] >> c) & 1)
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                    *(route[i]++) = out_ch_number++;
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    }
132
1
    formats = ff_make_format_list(packed_sample_fmts);
133
1
    if ((ret = ff_set_common_formats(ctx, formats)) < 0)
134
        return ret;
135
3
    for (i = 0; i < s->nb_inputs; i++) {
136
2
        layouts = NULL;
137
2
        if ((ret = ff_add_channel_layout(&layouts, inlayout[i])) < 0)
138
            return ret;
139
2
        if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
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            return ret;
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    }
142
1
    layouts = NULL;
143
1
    if ((ret = ff_add_channel_layout(&layouts, outlayout)) < 0)
144
        return ret;
145
1
    if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
146
        return ret;
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148
1
    return ff_set_common_samplerates(ctx, ff_all_samplerates());
149
}
150
151
1
static int config_output(AVFilterLink *outlink)
152
{
153
1
    AVFilterContext *ctx = outlink->src;
154
1
    AMergeContext *s = ctx->priv;
155
    AVBPrint bp;
156
    int i;
157
158
2
    for (i = 1; i < s->nb_inputs; i++) {
159
1
        if (ctx->inputs[i]->sample_rate != ctx->inputs[0]->sample_rate) {
160
            av_log(ctx, AV_LOG_ERROR,
161
                   "Inputs must have the same sample rate "
162
                   "%d for in%d vs %d\n",
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                   ctx->inputs[i]->sample_rate, i, ctx->inputs[0]->sample_rate);
164
            return AVERROR(EINVAL);
165
        }
166
    }
167
1
    s->bps = av_get_bytes_per_sample(ctx->outputs[0]->format);
168
1
    outlink->sample_rate = ctx->inputs[0]->sample_rate;
169
1
    outlink->time_base   = ctx->inputs[0]->time_base;
170
171
1
    av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
172
3
    for (i = 0; i < s->nb_inputs; i++) {
173
2
        av_bprintf(&bp, "%sin%d:", i ? " + " : "", i);
174
2
        av_bprint_channel_layout(&bp, -1, ctx->inputs[i]->channel_layout);
175
    }
176
1
    av_bprintf(&bp, " -> out:");
177
1
    av_bprint_channel_layout(&bp, -1, ctx->outputs[0]->channel_layout);
178
1
    av_log(ctx, AV_LOG_VERBOSE, "%s\n", bp.str);
179
180
1
    return 0;
181
}
182
183
/**
184
 * Copy samples from several input streams to one output stream.
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 * @param nb_inputs number of inputs
186
 * @param in        inputs; used only for the nb_ch field;
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 * @param route     routing values;
188
 *                  input channel i goes to output channel route[i];
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 *                  i <  in[0].nb_ch are the channels from the first output;
190
 *                  i >= in[0].nb_ch are the channels from the second output
191
 * @param ins       pointer to the samples of each inputs, in packed format;
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 *                  will be left at the end of the copied samples
193
 * @param outs      pointer to the samples of the output, in packet format;
194
 *                  must point to a buffer big enough;
195
 *                  will be left at the end of the copied samples
196
 * @param ns        number of samples to copy
197
 * @param bps       bytes per sample
198
 */
199
130
static inline void copy_samples(int nb_inputs, struct amerge_input in[],
200
                                int *route, uint8_t *ins[],
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                                uint8_t **outs, int ns, int bps)
202
{
203
    int *route_cur;
204
130
    int i, c, nb_ch = 0;
205
206
390
    for (i = 0; i < nb_inputs; i++)
207
260
        nb_ch += in[i].nb_ch;
208
264730
    while (ns--) {
209
264600
        route_cur = route;
210
793800
        for (i = 0; i < nb_inputs; i++) {
211
1058400
            for (c = 0; c < in[i].nb_ch; c++) {
212
529200
                memcpy((*outs) + bps * *(route_cur++), ins[i], bps);
213
529200
                ins[i] += bps;
214
            }
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        }
216
264600
        *outs += nb_ch * bps;
217
    }
218
130
}
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220
130
static void free_frames(int nb_inputs, AVFrame **input_frames)
221
{
222
    int i;
223
390
    for (i = 0; i < nb_inputs; i++)
224
260
        av_frame_free(&input_frames[i]);
225
130
}
226
227
130
static int try_push_frame(AVFilterContext *ctx, int nb_samples)
228
{
229
130
    AMergeContext *s = ctx->priv;
230
130
    AVFilterLink *outlink = ctx->outputs[0];
231
    int i, ret;
232
130
    AVFrame *outbuf, *inbuf[SWR_CH_MAX] = { NULL };
233
    uint8_t *outs, *ins[SWR_CH_MAX];
234
235
390
    for (i = 0; i < ctx->nb_inputs; i++) {
236
260
        ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &inbuf[i]);
237
260
        if (ret < 0) {
238
            free_frames(i, inbuf);
239
            return ret;
240
        }
241
260
        ins[i] = inbuf[i]->data[0];
242
    }
243
244
130
    outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
245
130
    if (!outbuf) {
246
        free_frames(s->nb_inputs, inbuf);
247
        return AVERROR(ENOMEM);
248
    }
249
250
130
    outs = outbuf->data[0];
251
130
    outbuf->pts = inbuf[0]->pts;
252
253
130
    outbuf->nb_samples     = nb_samples;
254
130
    outbuf->channel_layout = outlink->channel_layout;
255
130
    outbuf->channels       = outlink->channels;
256
257
260
    while (nb_samples) {
258
        /* Unroll the most common sample formats: speed +~350% for the loop,
259
           +~13% overall (including two common decoders) */
260

130
        switch (s->bps) {
261
            case 1:
262
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 1);
263
                break;
264
130
            case 2:
265
130
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 2);
266
130
                break;
267
            case 4:
268
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 4);
269
                break;
270
            default:
271
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, s->bps);
272
                break;
273
        }
274
275
130
        nb_samples = 0;
276
    }
277
278
130
    free_frames(s->nb_inputs, inbuf);
279
130
    return ff_filter_frame(ctx->outputs[0], outbuf);
280
}
281
282
391
static int activate(AVFilterContext *ctx)
283
{
284
    int i, status;
285
    int ret, nb_samples;
286
    int64_t pts;
287
288

393
    FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
289
290
390
    nb_samples = ff_inlink_queued_samples(ctx->inputs[0]);
291

649
    for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
292
259
        nb_samples = FFMIN(ff_inlink_queued_samples(ctx->inputs[i]), nb_samples);
293
    }
294
295
390
    if (nb_samples) {
296
130
        ret = try_push_frame(ctx, nb_samples);
297
130
        if (ret < 0)
298
            return ret;
299
    }
300
301
779
    for (i = 0; i < ctx->nb_inputs; i++) {
302
649
        if (ff_inlink_queued_samples(ctx->inputs[i]))
303
129
            continue;
304
305
520
        if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
306
1
            ff_outlink_set_status(ctx->outputs[0], status, pts);
307
1
            return 0;
308
519
        } else if (ff_outlink_frame_wanted(ctx->outputs[0])) {
309
259
            ff_inlink_request_frame(ctx->inputs[i]);
310
259
            return 0;
311
        }
312
    }
313
314
130
    return 0;
315
}
316
317
2
static av_cold int init(AVFilterContext *ctx)
318
{
319
2
    AMergeContext *s = ctx->priv;
320
    int i, ret;
321
322
2
    s->in = av_calloc(s->nb_inputs, sizeof(*s->in));
323
2
    if (!s->in)
324
        return AVERROR(ENOMEM);
325
6
    for (i = 0; i < s->nb_inputs; i++) {
326
4
        char *name = av_asprintf("in%d", i);
327
4
        AVFilterPad pad = {
328
            .name             = name,
329
            .type             = AVMEDIA_TYPE_AUDIO,
330
        };
331
4
        if (!name)
332
            return AVERROR(ENOMEM);
333
4
        if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
334
            av_freep(&pad.name);
335
            return ret;
336
        }
337
    }
338
2
    return 0;
339
}
340
341
static const AVFilterPad amerge_outputs[] = {
342
    {
343
        .name          = "default",
344
        .type          = AVMEDIA_TYPE_AUDIO,
345
        .config_props  = config_output,
346
    },
347
    { NULL }
348
};
349
350
AVFilter ff_af_amerge = {
351
    .name          = "amerge",
352
    .description   = NULL_IF_CONFIG_SMALL("Merge two or more audio streams into "
353
                                          "a single multi-channel stream."),
354
    .priv_size     = sizeof(AMergeContext),
355
    .init          = init,
356
    .uninit        = uninit,
357
    .query_formats = query_formats,
358
    .activate      = activate,
359
    .inputs        = NULL,
360
    .outputs       = amerge_outputs,
361
    .priv_class    = &amerge_class,
362
    .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,
363
};