[deb_ffmpeg.git] / ffmpeg / libavfilter / af_amerge.c

/*
 * 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 "audio.h"
#include "bufferqueue.h"
#include "internal.h"

#define SWR_CH_MAX 32

typedef struct {
    const AVClass *class;
    int nb_inputs;
    int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */
    int bps;
    struct amerge_input {
        struct FFBufQueue queue;
        int nb_ch;         /**< number of channels for the input */
        int nb_samples;
        int pos;
    } *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 }, 2, SWR_CH_MAX, FLAGS },
    { NULL }
};

AVFILTER_DEFINE_CLASS(amerge);

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

    for (i = 0; i < am->nb_inputs; i++) {
        if (am->in)
            ff_bufqueue_discard_all(&am->in[i].queue);
        if (ctx->input_pads)
            av_freep(&ctx->input_pads[i].name);
    }
    av_freep(&am->in);
}

static int query_formats(AVFilterContext *ctx)
{
    AMergeContext *am = ctx->priv;
    int64_t inlayout[SWR_CH_MAX], outlayout = 0;
    AVFilterFormats *formats;
    AVFilterChannelLayouts *layouts;
    int i, overlap = 0, nb_ch = 0;

    for (i = 0; i < am->nb_inputs; i++) {
        if (!ctx->inputs[i]->in_channel_layouts ||
            !ctx->inputs[i]->in_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]->in_channel_layouts->channel_layouts[0];
        if (ctx->inputs[i]->in_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);
        }
        am->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]);
        if (outlayout & inlayout[i])
            overlap++;
        outlayout |= inlayout[i];
        nb_ch += am->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++)
            am->route[i] = i;
        outlayout = av_get_default_channel_layout(nb_ch);
        if (!outlayout)
            outlayout = ((int64_t)1 << nb_ch) - 1;
    } else {
        int *route[SWR_CH_MAX];
        int c, out_ch_number = 0;

        route[0] = am->route;
        for (i = 1; i < am->nb_inputs; i++)
            route[i] = route[i - 1] + am->in[i - 1].nb_ch;
        for (c = 0; c < 64; c++)
            for (i = 0; i < am->nb_inputs; i++)
                if ((inlayout[i] >> c) & 1)
                    *(route[i]++) = out_ch_number++;
    }
    formats = ff_make_format_list(ff_packed_sample_fmts_array);
    ff_set_common_formats(ctx, formats);
    for (i = 0; i < am->nb_inputs; i++) {
        layouts = NULL;
        ff_add_channel_layout(&layouts, inlayout[i]);
        ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts);
    }
    layouts = NULL;
    ff_add_channel_layout(&layouts, outlayout);
    ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);
    ff_set_common_samplerates(ctx, ff_all_samplerates());
    return 0;
}

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

    for (i = 1; i < am->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);
        }
    }
    am->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, 1);
    for (i = 0; i < am->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;
}

static int request_frame(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    AMergeContext *am = ctx->priv;
    int i, ret;

    for (i = 0; i < am->nb_inputs; i++)
        if (!am->in[i].nb_samples)
            if ((ret = ff_request_frame(ctx->inputs[i])) < 0)
                return ret;
    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 int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
    AVFilterContext *ctx = inlink->dst;
    AMergeContext *am = ctx->priv;
    AVFilterLink *const outlink = ctx->outputs[0];
    int input_number;
    int nb_samples, ns, i;
    AVFrame *outbuf, *inbuf[SWR_CH_MAX];
    uint8_t *ins[SWR_CH_MAX], *outs;

    for (input_number = 0; input_number < am->nb_inputs; input_number++)
        if (inlink == ctx->inputs[input_number])
            break;
    av_assert1(input_number < am->nb_inputs);
    if (ff_bufqueue_is_full(&am->in[input_number].queue)) {
        av_frame_free(&insamples);
        return AVERROR(ENOMEM);
    }
    ff_bufqueue_add(ctx, &am->in[input_number].queue, av_frame_clone(insamples));
    am->in[input_number].nb_samples += insamples->nb_samples;
    av_frame_free(&insamples);
    nb_samples = am->in[0].nb_samples;
    for (i = 1; i < am->nb_inputs; i++)
        nb_samples = FFMIN(nb_samples, am->in[i].nb_samples);
    if (!nb_samples)
        return 0;

    outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
    if (!outbuf)
        return AVERROR(ENOMEM);
    outs = outbuf->data[0];
    for (i = 0; i < am->nb_inputs; i++) {
        inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);
        ins[i] = inbuf[i]->data[0] +
                 am->in[i].pos * am->in[i].nb_ch * am->bps;
    }
    av_frame_copy_props(outbuf, inbuf[0]);
    outbuf->pts = inbuf[0]->pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
                  inbuf[0]->pts +
                  av_rescale_q(am->in[0].pos,
                               av_make_q(1, ctx->inputs[0]->sample_rate),
                               ctx->outputs[0]->time_base);

    outbuf->nb_samples     = nb_samples;
    outbuf->channel_layout = outlink->channel_layout;
    av_frame_set_channels(outbuf, outlink->channels);

    while (nb_samples) {
        ns = nb_samples;
        for (i = 0; i < am->nb_inputs; i++)
            ns = FFMIN(ns, inbuf[i]->nb_samples - am->in[i].pos);
        /* Unroll the most common sample formats: speed +~350% for the loop,
           +~13% overall (including two common decoders) */
        switch (am->bps) {
            case 1:
                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 1);
                break;
            case 2:
                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 2);
                break;
            case 4:
                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 4);
                break;
            default:
                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, am->bps);
                break;
        }

        nb_samples -= ns;
        for (i = 0; i < am->nb_inputs; i++) {
            am->in[i].nb_samples -= ns;
            am->in[i].pos += ns;
            if (am->in[i].pos == inbuf[i]->nb_samples) {
                am->in[i].pos = 0;
                av_frame_free(&inbuf[i]);
                ff_bufqueue_get(&am->in[i].queue);
                inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);
                ins[i] = inbuf[i] ? inbuf[i]->data[0] : NULL;
            }
        }
    }
    return ff_filter_frame(ctx->outputs[0], outbuf);
}

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

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

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

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,
    .inputs        = NULL,
    .outputs       = amerge_outputs,
    .priv_class    = &amerge_class,
    .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org>
	3	*
	4	* This file is part of FFmpeg.
	5	*
	6	* FFmpeg is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2.1 of the License, or (at your option) any later version.
	10	*
	11	* FFmpeg is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with FFmpeg; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	/**
	22	* @file
	23	* 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"
	30	#include "avfilter.h"
	31	#include "audio.h"
	32	#include "bufferqueue.h"
	33	#include "internal.h"
	34
	35	#define SWR_CH_MAX 32
	36
	37	typedef struct {
	38	const AVClass *class;
	39	int nb_inputs;
	40	int route[SWR_CH_MAX]; /*< channels routing, see copy_samples /
	41	int bps;
	42	struct amerge_input {
	43	struct FFBufQueue queue;
	44	int nb_ch; /*< number of channels for the input /
	45	int nb_samples;
	46	int pos;
	47	} *in;
	48	} AMergeContext;
	49
	50	#define OFFSET(x) offsetof(AMergeContext, x)
	51	#define FLAGS AV_OPT_FLAG_AUDIO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM
	52
	53	static const AVOption amerge_options[] = {
	54	{ "inputs", "specify the number of inputs", OFFSET(nb_inputs),
	55	AV_OPT_TYPE_INT, { .i64 = 2 }, 2, SWR_CH_MAX, FLAGS },
	56	{ NULL }
	57	};
	58
	59	AVFILTER_DEFINE_CLASS(amerge);
	60
	61	static av_cold void uninit(AVFilterContext *ctx)
	62	{
	63	AMergeContext *am = ctx->priv;
	64	int i;
65
66	for (i = 0; i < am->nb_inputs; i++) {
67	if (am->in)
68	ff_bufqueue_discard_all(&am->in[i].queue);
69	if (ctx->input_pads)
70	av_freep(&ctx->input_pads[i].name);
71	}
72	av_freep(&am->in);
73	}
74
75	static int query_formats(AVFilterContext *ctx)
76	{
77	AMergeContext *am = ctx->priv;
78	int64_t inlayout[SWR_CH_MAX], outlayout = 0;
79	AVFilterFormats *formats;
80	AVFilterChannelLayouts *layouts;
81	int i, overlap = 0, nb_ch = 0;
82
83	for (i = 0; i < am->nb_inputs; i++) {
84	if (!ctx->inputs[i]->in_channel_layouts \|\|
85	!ctx->inputs[i]->in_channel_layouts->nb_channel_layouts) {
86	av_log(ctx, AV_LOG_WARNING,
87	"No channel layout for input %d\n", i + 1);
88	return AVERROR(EAGAIN);
89	}
90	inlayout[i] = ctx->inputs[i]->in_channel_layouts->channel_layouts[0];
91	if (ctx->inputs[i]->in_channel_layouts->nb_channel_layouts > 1) {
92	char buf[256];
93	av_get_channel_layout_string(buf, sizeof(buf), 0, inlayout[i]);
94	av_log(ctx, AV_LOG_INFO, "Using \"%s\" for input %d\n", buf, i + 1);
95	}
96	am->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]);
97	if (outlayout & inlayout[i])
98	overlap++;
99	outlayout \|= inlayout[i];
100	nb_ch += am->in[i].nb_ch;
101	}
102	if (nb_ch > SWR_CH_MAX) {
103	av_log(ctx, AV_LOG_ERROR, "Too many channels (max %d)\n", SWR_CH_MAX);
104	return AVERROR(EINVAL);
105	}
106	if (overlap) {
107	av_log(ctx, AV_LOG_WARNING,
108	"Input channel layouts overlap: "
109	"output layout will be determined by the number of distinct input channels\n");
110	for (i = 0; i < nb_ch; i++)
111	am->route[i] = i;
112	outlayout = av_get_default_channel_layout(nb_ch);
113	if (!outlayout)
114	outlayout = ((int64_t)1 << nb_ch) - 1;
115	} else {
116	int *route[SWR_CH_MAX];
117	int c, out_ch_number = 0;
118
119	route[0] = am->route;
120	for (i = 1; i < am->nb_inputs; i++)
121	route[i] = route[i - 1] + am->in[i - 1].nb_ch;
122	for (c = 0; c < 64; c++)
123	for (i = 0; i < am->nb_inputs; i++)
124	if ((inlayout[i] >> c) & 1)
125	*(route[i]++) = out_ch_number++;
126	}
127	formats = ff_make_format_list(ff_packed_sample_fmts_array);
128	ff_set_common_formats(ctx, formats);
129	for (i = 0; i < am->nb_inputs; i++) {
130	layouts = NULL;
131	ff_add_channel_layout(&layouts, inlayout[i]);
132	ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts);
133	}
134	layouts = NULL;
135	ff_add_channel_layout(&layouts, outlayout);
136	ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);
137	ff_set_common_samplerates(ctx, ff_all_samplerates());
138	return 0;
139	}
140
141	static int config_output(AVFilterLink *outlink)
142	{
143	AVFilterContext *ctx = outlink->src;
144	AMergeContext *am = ctx->priv;
145	AVBPrint bp;
146	int i;
147
148	for (i = 1; i < am->nb_inputs; i++) {
149	if (ctx->inputs[i]->sample_rate != ctx->inputs[0]->sample_rate) {
150	av_log(ctx, AV_LOG_ERROR,
151	"Inputs must have the same sample rate "
152	"%d for in%d vs %d\n",
153	ctx->inputs[i]->sample_rate, i, ctx->inputs[0]->sample_rate);
154	return AVERROR(EINVAL);
155	}
156	}
157	am->bps = av_get_bytes_per_sample(ctx->outputs[0]->format);
158	outlink->sample_rate = ctx->inputs[0]->sample_rate;
159	outlink->time_base = ctx->inputs[0]->time_base;
160
161	av_bprint_init(&bp, 0, 1);
162	for (i = 0; i < am->nb_inputs; i++) {
163	av_bprintf(&bp, "%sin%d:", i ? " + " : "", i);
164	av_bprint_channel_layout(&bp, -1, ctx->inputs[i]->channel_layout);
165	}
166	av_bprintf(&bp, " -> out:");
167	av_bprint_channel_layout(&bp, -1, ctx->outputs[0]->channel_layout);
168	av_log(ctx, AV_LOG_VERBOSE, "%s\n", bp.str);
169
170	return 0;
171	}
172
173	static int request_frame(AVFilterLink *outlink)
174	{
175	AVFilterContext *ctx = outlink->src;
176	AMergeContext *am = ctx->priv;
177	int i, ret;
178
179	for (i = 0; i < am->nb_inputs; i++)
180	if (!am->in[i].nb_samples)
181	if ((ret = ff_request_frame(ctx->inputs[i])) < 0)
182	return ret;
183	return 0;
184	}
185
186	/**
187	* Copy samples from several input streams to one output stream.
188	* @param nb_inputs number of inputs
189	* @param in inputs; used only for the nb_ch field;
190	* @param route routing values;
191	* input channel i goes to output channel route[i];
192	* i < in[0].nb_ch are the channels from the first output;
193	* i >= in[0].nb_ch are the channels from the second output
194	* @param ins pointer to the samples of each inputs, in packed format;
195	* will be left at the end of the copied samples
196	* @param outs pointer to the samples of the output, in packet format;
197	* must point to a buffer big enough;
198	* will be left at the end of the copied samples
199	* @param ns number of samples to copy
200	* @param bps bytes per sample
201	*/
202	static inline void copy_samples(int nb_inputs, struct amerge_input in[],
203	int route, uint8_t ins[],
204	uint8_t **outs, int ns, int bps)
205	{
206	int *route_cur;
207	int i, c, nb_ch = 0;
208
209	for (i = 0; i < nb_inputs; i++)
210	nb_ch += in[i].nb_ch;
211	while (ns--) {
212	route_cur = route;
213	for (i = 0; i < nb_inputs; i++) {
214	for (c = 0; c < in[i].nb_ch; c++) {
215	memcpy((outs) + bps *(route_cur++), ins[i], bps);
216	ins[i] += bps;
217	}
218	}
219	outs += nb_ch bps;
220	}
221	}
222
223	static int filter_frame(AVFilterLink inlink, AVFrame insamples)
224	{
225	AVFilterContext *ctx = inlink->dst;
226	AMergeContext *am = ctx->priv;
227	AVFilterLink *const outlink = ctx->outputs[0];
228	int input_number;
229	int nb_samples, ns, i;
230	AVFrame outbuf, inbuf[SWR_CH_MAX];
231	uint8_t ins[SWR_CH_MAX], outs;
232
233	for (input_number = 0; input_number < am->nb_inputs; input_number++)
234	if (inlink == ctx->inputs[input_number])
235	break;
236	av_assert1(input_number < am->nb_inputs);
237	if (ff_bufqueue_is_full(&am->in[input_number].queue)) {
238	av_frame_free(&insamples);
239	return AVERROR(ENOMEM);
240	}
241	ff_bufqueue_add(ctx, &am->in[input_number].queue, av_frame_clone(insamples));
242	am->in[input_number].nb_samples += insamples->nb_samples;
243	av_frame_free(&insamples);
244	nb_samples = am->in[0].nb_samples;
245	for (i = 1; i < am->nb_inputs; i++)
246	nb_samples = FFMIN(nb_samples, am->in[i].nb_samples);
247	if (!nb_samples)
248	return 0;
249
250	outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
251	if (!outbuf)
252	return AVERROR(ENOMEM);
253	outs = outbuf->data[0];
254	for (i = 0; i < am->nb_inputs; i++) {
255	inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);
256	ins[i] = inbuf[i]->data[0] +
257	am->in[i].pos * am->in[i].nb_ch * am->bps;
258	}
259	av_frame_copy_props(outbuf, inbuf[0]);
260	outbuf->pts = inbuf[0]->pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
261	inbuf[0]->pts +
262	av_rescale_q(am->in[0].pos,
263	av_make_q(1, ctx->inputs[0]->sample_rate),
264	ctx->outputs[0]->time_base);
265
266	outbuf->nb_samples = nb_samples;
267	outbuf->channel_layout = outlink->channel_layout;
268	av_frame_set_channels(outbuf, outlink->channels);
269
270	while (nb_samples) {
271	ns = nb_samples;
272	for (i = 0; i < am->nb_inputs; i++)
273	ns = FFMIN(ns, inbuf[i]->nb_samples - am->in[i].pos);
274	/* Unroll the most common sample formats: speed +~350% for the loop,
275	+~13% overall (including two common decoders) */
276	switch (am->bps) {
277	case 1:
278	copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 1);
279	break;
280	case 2:
281	copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 2);
282	break;
283	case 4:
284	copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 4);
285	break;
286	default:
287	copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, am->bps);
288	break;
289	}
290
291	nb_samples -= ns;
292	for (i = 0; i < am->nb_inputs; i++) {
293	am->in[i].nb_samples -= ns;
294	am->in[i].pos += ns;
295	if (am->in[i].pos == inbuf[i]->nb_samples) {
296	am->in[i].pos = 0;
297	av_frame_free(&inbuf[i]);
298	ff_bufqueue_get(&am->in[i].queue);
299	inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);
300	ins[i] = inbuf[i] ? inbuf[i]->data[0] : NULL;
301	}
302	}
303	}
304	return ff_filter_frame(ctx->outputs[0], outbuf);
305	}
306
307	static av_cold int init(AVFilterContext *ctx)
308	{
309	AMergeContext *am = ctx->priv;
310	int i;
311
312	am->in = av_calloc(am->nb_inputs, sizeof(*am->in));
313	if (!am->in)
314	return AVERROR(ENOMEM);
315	for (i = 0; i < am->nb_inputs; i++) {
316	char *name = av_asprintf("in%d", i);
317	AVFilterPad pad = {
318	.name = name,
319	.type = AVMEDIA_TYPE_AUDIO,
320	.filter_frame = filter_frame,
321	};
322	if (!name)
323	return AVERROR(ENOMEM);
324	ff_insert_inpad(ctx, i, &pad);
325	}
326	return 0;
327	}
328
329	static const AVFilterPad amerge_outputs[] = {
330	{
331	.name = "default",
332	.type = AVMEDIA_TYPE_AUDIO,
333	.config_props = config_output,
334	.request_frame = request_frame,
335	},
336	{ NULL }
337	};
338
339	AVFilter ff_af_amerge = {
340	.name = "amerge",
341	.description = NULL_IF_CONFIG_SMALL("Merge two or more audio streams into "
342	"a single multi-channel stream."),
343	.priv_size = sizeof(AMergeContext),
344	.init = init,
345	.uninit = uninit,
346	.query_formats = query_formats,
347	.inputs = NULL,
348	.outputs = amerge_outputs,
349	.priv_class = &amerge_class,
350	.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
351	};