aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/af_amerge.c
blob: 2e45b7c27796bc9d56359c185ba2f1cb340e1e9e (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
/*
 * Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org>
 *
 * 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
 * Audio merging filter
 */

#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "audio.h"
#include "internal.h"

#define SWR_CH_MAX 64

typedef struct AMergeContext {
    const AVClass *class;
    int nb_inputs;
    int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */
    int bps;
    struct amerge_input {
        int nb_ch;         /**< number of channels for the input */
    } *in;
} AMergeContext;

#define OFFSET(x) offsetof(AMergeContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption amerge_options[] = {
    { "inputs", "specify the number of inputs", OFFSET(nb_inputs),
      AV_OPT_TYPE_INT, { .i64 = 2 }, 1, SWR_CH_MAX, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(amerge);

static av_cold void uninit(AVFilterContext *ctx)
{
    AMergeContext *s = ctx->priv;

    av_freep(&s->in);
    for (unsigned i = 0; i < ctx->nb_inputs; i++)
        av_freep(&ctx->input_pads[i].name);
}

static int query_formats(AVFilterContext *ctx)
{
    static const enum AVSampleFormat packed_sample_fmts[] = {
        AV_SAMPLE_FMT_U8,
        AV_SAMPLE_FMT_S16,
        AV_SAMPLE_FMT_S32,
        AV_SAMPLE_FMT_FLT,
        AV_SAMPLE_FMT_DBL,
        AV_SAMPLE_FMT_NONE
    };
    AMergeContext *s = ctx->priv;
    int64_t inlayout[SWR_CH_MAX], outlayout = 0;
    AVFilterFormats *formats;
    AVFilterChannelLayouts *layouts;
    int i, ret, overlap = 0, nb_ch = 0;

    for (i = 0; i < s->nb_inputs; i++) {
        if (!ctx->inputs[i]->incfg.channel_layouts ||
            !ctx->inputs[i]->incfg.channel_layouts->nb_channel_layouts) {
            av_log(ctx, AV_LOG_WARNING,
                   "No channel layout for input %d\n", i + 1);
            return AVERROR(EAGAIN);
        }
        inlayout[i] = ctx->inputs[i]->incfg.channel_layouts->channel_layouts[0];
        if (ctx->inputs[i]->incfg.channel_layouts->nb_channel_layouts > 1) {
            char buf[256];
            av_get_channel_layout_string(buf, sizeof(buf), 0, inlayout[i]);
            av_log(ctx, AV_LOG_INFO, "Using \"%s\" for input %d\n", buf, i + 1);
        }
        s->in[i].nb_ch = FF_LAYOUT2COUNT(inlayout[i]);
        if (s->in[i].nb_ch) {
            overlap++;
        } else {
            s->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]);
            if (outlayout & inlayout[i])
                overlap++;
            outlayout |= inlayout[i];
        }
        nb_ch += s->in[i].nb_ch;
    }
    if (nb_ch > SWR_CH_MAX) {
        av_log(ctx, AV_LOG_ERROR, "Too many channels (max %d)\n", SWR_CH_MAX);
        return AVERROR(EINVAL);
    }
    if (overlap) {
        av_log(ctx, AV_LOG_WARNING,
               "Input channel layouts overlap: "
               "output layout will be determined by the number of distinct input channels\n");
        for (i = 0; i < nb_ch; i++)
            s->route[i] = i;
        outlayout = av_get_default_channel_layout(nb_ch);
        if (!outlayout && nb_ch)
            outlayout = 0xFFFFFFFFFFFFFFFFULL >> (64 - nb_ch);
    } else {
        int *route[SWR_CH_MAX];
        int c, out_ch_number = 0;

        route[0] = s->route;
        for (i = 1; i < s->nb_inputs; i++)
            route[i] = route[i - 1] + s->in[i - 1].nb_ch;
        for (c = 0; c < 64; c++)
            for (i = 0; i < s->nb_inputs; i++)
                if ((inlayout[i] >> c) & 1)
                    *(route[i]++) = out_ch_number++;
    }
    formats = ff_make_format_list(packed_sample_fmts);
    if ((ret = ff_set_common_formats(ctx, formats)) < 0)
        return ret;
    for (i = 0; i < s->nb_inputs; i++) {
        layouts = NULL;
        if ((ret = ff_add_channel_layout(&layouts, inlayout[i])) < 0)
            return ret;
        if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0)
            return ret;
    }
    layouts = NULL;
    if ((ret = ff_add_channel_layout(&layouts, outlayout)) < 0)
        return ret;
    if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0)
        return ret;

    return ff_set_common_samplerates(ctx, ff_all_samplerates());
}

static int config_output(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    AMergeContext *s = ctx->priv;
    AVBPrint bp;
    int i;

    for (i = 1; i < s->nb_inputs; i++) {
        if (ctx->inputs[i]->sample_rate != ctx->inputs[0]->sample_rate) {
            av_log(ctx, AV_LOG_ERROR,
                   "Inputs must have the same sample rate "
                   "%d for in%d vs %d\n",
                   ctx->inputs[i]->sample_rate, i, ctx->inputs[0]->sample_rate);
            return AVERROR(EINVAL);
        }
    }
    s->bps = av_get_bytes_per_sample(ctx->outputs[0]->format);
    outlink->sample_rate = ctx->inputs[0]->sample_rate;
    outlink->time_base   = ctx->inputs[0]->time_base;

    av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
    for (i = 0; i < s->nb_inputs; i++) {
        av_bprintf(&bp, "%sin%d:", i ? " + " : "", i);
        av_bprint_channel_layout(&bp, -1, ctx->inputs[i]->channel_layout);
    }
    av_bprintf(&bp, " -> out:");
    av_bprint_channel_layout(&bp, -1, ctx->outputs[0]->channel_layout);
    av_log(ctx, AV_LOG_VERBOSE, "%s\n", bp.str);

    return 0;
}

/**
 * Copy samples from several input streams to one output stream.
 * @param nb_inputs number of inputs
 * @param in        inputs; used only for the nb_ch field;
 * @param route     routing values;
 *                  input channel i goes to output channel route[i];
 *                  i <  in[0].nb_ch are the channels from the first output;
 *                  i >= in[0].nb_ch are the channels from the second output
 * @param ins       pointer to the samples of each inputs, in packed format;
 *                  will be left at the end of the copied samples
 * @param outs      pointer to the samples of the output, in packet format;
 *                  must point to a buffer big enough;
 *                  will be left at the end of the copied samples
 * @param ns        number of samples to copy
 * @param bps       bytes per sample
 */
static inline void copy_samples(int nb_inputs, struct amerge_input in[],
                                int *route, uint8_t *ins[],
                                uint8_t **outs, int ns, int bps)
{
    int *route_cur;
    int i, c, nb_ch = 0;

    for (i = 0; i < nb_inputs; i++)
        nb_ch += in[i].nb_ch;
    while (ns--) {
        route_cur = route;
        for (i = 0; i < nb_inputs; i++) {
            for (c = 0; c < in[i].nb_ch; c++) {
                memcpy((*outs) + bps * *(route_cur++), ins[i], bps);
                ins[i] += bps;
            }
        }
        *outs += nb_ch * bps;
    }
}

static void free_frames(int nb_inputs, AVFrame **input_frames)
{
    int i;
    for (i = 0; i < nb_inputs; i++)
        av_frame_free(&input_frames[i]);
}

static int try_push_frame(AVFilterContext *ctx, int nb_samples)
{
    AMergeContext *s = ctx->priv;
    AVFilterLink *outlink = ctx->outputs[0];
    int i, ret;
    AVFrame *outbuf, *inbuf[SWR_CH_MAX] = { NULL };
    uint8_t *outs, *ins[SWR_CH_MAX];

    for (i = 0; i < ctx->nb_inputs; i++) {
        ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &inbuf[i]);
        if (ret < 0) {
            free_frames(i, inbuf);
            return ret;
        }
        ins[i] = inbuf[i]->data[0];
    }

    outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
    if (!outbuf) {
        free_frames(s->nb_inputs, inbuf);
        return AVERROR(ENOMEM);
    }

    outs = outbuf->data[0];
    outbuf->pts = inbuf[0]->pts;

    outbuf->nb_samples     = nb_samples;
    outbuf->channel_layout = outlink->channel_layout;
    outbuf->channels       = outlink->channels;

    while (nb_samples) {
        /* Unroll the most common sample formats: speed +~350% for the loop,
           +~13% overall (including two common decoders) */
        switch (s->bps) {
            case 1:
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 1);
                break;
            case 2:
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 2);
                break;
            case 4:
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 4);
                break;
            default:
                copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, s->bps);
                break;
        }

        nb_samples = 0;
    }

    free_frames(s->nb_inputs, inbuf);
    return ff_filter_frame(ctx->outputs[0], outbuf);
}

static int activate(AVFilterContext *ctx)
{
    int i, status;
    int ret, nb_samples;
    int64_t pts;

    FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);

    nb_samples = ff_inlink_queued_samples(ctx->inputs[0]);
    for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) {
        nb_samples = FFMIN(ff_inlink_queued_samples(ctx->inputs[i]), nb_samples);
    }

    if (nb_samples) {
        ret = try_push_frame(ctx, nb_samples);
        if (ret < 0)
            return ret;
    }

    for (i = 0; i < ctx->nb_inputs; i++) {
        if (ff_inlink_queued_samples(ctx->inputs[i]))
            continue;

        if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) {
            ff_outlink_set_status(ctx->outputs[0], status, pts);
            return 0;
        } else if (ff_outlink_frame_wanted(ctx->outputs[0])) {
            ff_inlink_request_frame(ctx->inputs[i]);
            return 0;
        }
    }

    return 0;
}

static av_cold int init(AVFilterContext *ctx)
{
    AMergeContext *s = ctx->priv;
    int i, ret;

    s->in = av_calloc(s->nb_inputs, sizeof(*s->in));
    if (!s->in)
        return AVERROR(ENOMEM);
    for (i = 0; i < s->nb_inputs; i++) {
        char *name = av_asprintf("in%d", i);
        AVFilterPad pad = {
            .name             = name,
            .type             = AVMEDIA_TYPE_AUDIO,
        };
        if (!name)
            return AVERROR(ENOMEM);
        if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
            av_freep(&pad.name);
            return ret;
        }
    }
    return 0;
}

static const AVFilterPad amerge_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .config_props  = config_output,
    },
    { NULL }
};

const AVFilter ff_af_amerge = {
    .name          = "amerge",
    .description   = NULL_IF_CONFIG_SMALL("Merge two or more audio streams into "
                                          "a single multi-channel stream."),
    .priv_size     = sizeof(AMergeContext),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .activate      = activate,
    .inputs        = NULL,
    .outputs       = amerge_outputs,
    .priv_class    = &amerge_class,
    .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,
};