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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
- * GNU 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/audioconvert.h"
- #include "libavutil/bprint.h"
- #include "libavutil/opt.h"
- #include "libswresample/swresample.h" // only for SWR_CH_MAX
- #include "avfilter.h"
- #include "audio.h"
- #include "bufferqueue.h"
- #include "internal.h"
- 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)
- static const AVOption amerge_options[] = {
- { "inputs", "specify the number of inputs", OFFSET(nb_inputs),
- AV_OPT_TYPE_INT, { .dbl = 2 }, 2, SWR_CH_MAX },
- {0}
- };
- 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++)
- ff_bufqueue_discard_all(&am->in[i].queue);
- 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_ERROR,
- "No channel layout for input %d\n", i + 1);
- return AVERROR(EINVAL);
- }
- 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,
- "Inputs overlap: output layout will be meaningless\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_INFO, "%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_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
- {
- AVFilterContext *ctx = inlink->dst;
- AMergeContext *am = ctx->priv;
- AVFilterLink *const outlink = ctx->outputs[0];
- int input_number;
- int nb_samples, ns, i;
- AVFilterBufferRef *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);
- ff_bufqueue_add(ctx, &am->in[input_number].queue, insamples);
- am->in[input_number].nb_samples += insamples->audio->nb_samples;
- 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], AV_PERM_WRITE, nb_samples);
- 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;
- }
- outbuf->pts = inbuf[0]->pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
- inbuf[0]->pts +
- av_rescale_q(am->in[0].pos,
- (AVRational){ 1, ctx->inputs[0]->sample_rate },
- ctx->outputs[0]->time_base);
- avfilter_copy_buffer_ref_props(outbuf, inbuf[0]);
- outbuf->audio->nb_samples = nb_samples;
- outbuf->audio->channel_layout = outlink->channel_layout;
- while (nb_samples) {
- ns = nb_samples;
- for (i = 0; i < am->nb_inputs; i++)
- ns = FFMIN(ns, inbuf[i]->audio->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]->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;
- }
- }
- }
- return ff_filter_samples(ctx->outputs[0], outbuf);
- }
- static av_cold int init(AVFilterContext *ctx, const char *args)
- {
- AMergeContext *am = ctx->priv;
- int ret, i;
- char name[16];
- 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++) {
- AVFilterPad pad = {
- .name = name,
- .type = AVMEDIA_TYPE_AUDIO,
- .filter_samples = filter_samples,
- .min_perms = AV_PERM_READ | AV_PERM_PRESERVE,
- };
- snprintf(name, sizeof(name), "in%d", i);
- ff_insert_inpad(ctx, i, &pad);
- }
- return 0;
- }
- 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),
- .init = init,
- .uninit = uninit,
- .query_formats = query_formats,
- .inputs = (const AVFilterPad[]) { { .name = NULL } },
- .outputs = (const AVFilterPad[]) {
- { .name = "default",
- .type = AVMEDIA_TYPE_AUDIO,
- .config_props = config_output,
- .request_frame = request_frame, },
- { .name = NULL }
- },
- };
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