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/*
* 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 |
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* GNU Lesser General Public License for more details. |
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*
* 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
*/
|
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#include "libavutil/avstring.h" |
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#include "libavutil/bprint.h" |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/opt.h" |
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#include "libswresample/swresample.h" // only for SWR_CH_MAX
#include "avfilter.h" |
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#include "audio.h" |
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#include "bufferqueue.h" |
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#include "internal.h"
typedef struct { |
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const AVClass *class;
int nb_inputs; |
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int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */
int bps; |
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struct amerge_input {
struct FFBufQueue queue; |
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int nb_ch; /**< number of channels for the input */ |
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int nb_samples;
int pos; |
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} *in; |
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} AMergeContext;
|
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#define OFFSET(x) offsetof(AMergeContext, x) |
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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static const AVOption amerge_options[] = {
{ "inputs", "specify the number of inputs", OFFSET(nb_inputs), |
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AV_OPT_TYPE_INT, { .i64 = 2 }, 2, SWR_CH_MAX, FLAGS }, |
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{0} |
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};
|
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AVFILTER_DEFINE_CLASS(amerge); |
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|
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static av_cold void uninit(AVFilterContext *ctx)
{
AMergeContext *am = ctx->priv; |
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int i; |
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|
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for (i = 0; i < am->nb_inputs; i++) { |
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ff_bufqueue_discard_all(&am->in[i].queue); |
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av_freep(&ctx->input_pads[i].name);
} |
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av_freep(&am->in); |
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}
static int query_formats(AVFilterContext *ctx)
{
AMergeContext *am = ctx->priv; |
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int64_t inlayout[SWR_CH_MAX], outlayout = 0; |
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AVFilterFormats *formats; |
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AVFilterChannelLayouts *layouts; |
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int i, overlap = 0, nb_ch = 0; |
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|
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for (i = 0; i < am->nb_inputs; i++) { |
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if (!ctx->inputs[i]->in_channel_layouts ||
!ctx->inputs[i]->in_channel_layouts->nb_channel_layouts) { |
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av_log(ctx, AV_LOG_ERROR,
"No channel layout for input %d\n", i + 1);
return AVERROR(EINVAL);
} |
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inlayout[i] = ctx->inputs[i]->in_channel_layouts->channel_layouts[0];
if (ctx->inputs[i]->in_channel_layouts->nb_channel_layouts > 1) { |
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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);
} |
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am->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]); |
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if (outlayout & inlayout[i])
overlap++;
outlayout |= inlayout[i];
nb_ch += am->in[i].nb_ch; |
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} |
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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);
return AVERROR(EINVAL);
} |
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if (overlap) { |
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av_log(ctx, AV_LOG_WARNING, |
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"Input channel layouts overlap: "
"output layout will be determined by the number of distinct input channels\n"); |
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for (i = 0; i < nb_ch; i++) |
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am->route[i] = i; |
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outlayout = av_get_default_channel_layout(nb_ch); |
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if (!outlayout) |
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outlayout = ((int64_t)1 << nb_ch) - 1; |
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} else { |
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int *route[SWR_CH_MAX]; |
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int c, out_ch_number = 0;
|
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route[0] = am->route;
for (i = 1; i < am->nb_inputs; i++)
route[i] = route[i - 1] + am->in[i - 1].nb_ch; |
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for (c = 0; c < 64; c++) |
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for (i = 0; i < am->nb_inputs; i++) |
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if ((inlayout[i] >> c) & 1)
*(route[i]++) = out_ch_number++;
} |
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formats = ff_make_format_list(ff_packed_sample_fmts_array);
ff_set_common_formats(ctx, formats); |
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for (i = 0; i < am->nb_inputs; i++) { |
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layouts = NULL;
ff_add_channel_layout(&layouts, inlayout[i]);
ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts); |
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} |
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layouts = NULL;
ff_add_channel_layout(&layouts, outlayout);
ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts); |
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ff_set_common_samplerates(ctx, ff_all_samplerates()); |
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return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AMergeContext *am = ctx->priv; |
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AVBPrint bp; |
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int i;
|
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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 " |
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"%d for in%d vs %d\n", |
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ctx->inputs[i]->sample_rate, i, ctx->inputs[0]->sample_rate);
return AVERROR(EINVAL);
} |
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}
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; |
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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); |
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} |
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av_bprintf(&bp, " -> out:");
av_bprint_channel_layout(&bp, -1, ctx->outputs[0]->channel_layout); |
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av_log(ctx, AV_LOG_VERBOSE, "%s\n", bp.str); |
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|
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return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AMergeContext *am = ctx->priv; |
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int i, ret; |
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|
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for (i = 0; i < am->nb_inputs; i++) |
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if (!am->in[i].nb_samples) |
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if ((ret = ff_request_frame(ctx->inputs[i])) < 0) |
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return ret; |
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return 0;
}
/** |
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* Copy samples from several input streams to one output stream.
* @param nb_inputs number of inputs |
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* @param in inputs; used only for the nb_ch field; |
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* @param route routing values;
* 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;
* i >= in[0].nb_ch are the channels from the second output |
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* @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
*/ |
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static inline void copy_samples(int nb_inputs, struct amerge_input in[],
int *route, uint8_t *ins[], |
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uint8_t **outs, int ns, int bps)
{
int *route_cur; |
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int i, c, nb_ch = 0; |
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|
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for (i = 0; i < nb_inputs; i++)
nb_ch += in[i].nb_ch; |
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while (ns--) {
route_cur = route; |
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for (i = 0; i < nb_inputs; i++) { |
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for (c = 0; c < in[i].nb_ch; c++) { |
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memcpy((*outs) + bps * *(route_cur++), ins[i], bps);
ins[i] += bps;
}
} |
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*outs += nb_ch * bps; |
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}
}
|
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples) |
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{
AVFilterContext *ctx = inlink->dst;
AMergeContext *am = ctx->priv; |
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AVFilterLink *const outlink = ctx->outputs[0]; |
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int input_number; |
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int nb_samples, ns, i; |
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AVFilterBufferRef *outbuf, *inbuf[SWR_CH_MAX];
uint8_t *ins[SWR_CH_MAX], *outs; |
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|
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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); |
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ff_bufqueue_add(ctx, &am->in[input_number].queue, insamples);
am->in[input_number].nb_samples += insamples->audio->nb_samples; |
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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) |
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return 0; |
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|
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outbuf = ff_get_audio_buffer(ctx->outputs[0], AV_PERM_WRITE, nb_samples); |
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outs = outbuf->data[0]; |
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for (i = 0; i < am->nb_inputs; i++) { |
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inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);
ins[i] = inbuf[i]->data[0] + |
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am->in[i].pos * am->in[i].nb_ch * am->bps; |
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} |
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avfilter_copy_buffer_ref_props(outbuf, inbuf[0]); |
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outbuf->pts = inbuf[0]->pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
inbuf[0]->pts +
av_rescale_q(am->in[0].pos, |
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(AVRational){ 1, ctx->inputs[0]->sample_rate },
ctx->outputs[0]->time_base); |
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outbuf->audio->nb_samples = nb_samples;
outbuf->audio->channel_layout = outlink->channel_layout;
|
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while (nb_samples) {
ns = nb_samples; |
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for (i = 0; i < am->nb_inputs; i++) |
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ns = FFMIN(ns, inbuf[i]->audio->nb_samples - am->in[i].pos); |
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/* Unroll the most common sample formats: speed +~350% for the loop,
+~13% overall (including two common decoders) */
switch (am->bps) {
case 1: |
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copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 1); |
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break;
case 2: |
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copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 2); |
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break;
case 4: |
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copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 4); |
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break;
default: |
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copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, am->bps); |
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break;
}
nb_samples -= ns; |
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for (i = 0; i < am->nb_inputs; i++) { |
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am->in[i].nb_samples -= ns;
am->in[i].pos += ns;
if (am->in[i].pos == inbuf[i]->audio->nb_samples) {
am->in[i].pos = 0;
avfilter_unref_buffer(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; |
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}
}
} |
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return ff_filter_frame(ctx->outputs[0], outbuf); |
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}
|
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static av_cold int init(AVFilterContext *ctx, const char *args) |
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{
AMergeContext *am = ctx->priv;
int ret, i;
am->class = &amerge_class;
av_opt_set_defaults(am);
ret = av_set_options_string(am, args, "=", ":");
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing options: '%s'\n", args);
return ret;
}
am->in = av_calloc(am->nb_inputs, sizeof(*am->in));
if (!am->in)
return AVERROR(ENOMEM);
for (i = 0; i < am->nb_inputs; i++) { |
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char *name = av_asprintf("in%d", i); |
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AVFilterPad pad = {
.name = name,
.type = AVMEDIA_TYPE_AUDIO, |
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.filter_frame = filter_frame, |
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.min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
}; |
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if (!name)
return AVERROR(ENOMEM); |
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ff_insert_inpad(ctx, i, &pad); |
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}
return 0;
}
|
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static const AVFilterPad amerge_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
|
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AVFilter avfilter_af_amerge = {
.name = "amerge",
.description = NULL_IF_CONFIG_SMALL("Merge two audio streams into "
"a single multi-channel stream."),
.priv_size = sizeof(AMergeContext), |
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.init = init, |
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.uninit = uninit,
.query_formats = query_formats, |
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.inputs = NULL,
.outputs = amerge_outputs,
.priv_class = &amerge_class, |
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}; |