301 lines
11 KiB
C
301 lines
11 KiB
C
/*
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* Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org>
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*
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* This file is part of FFmpeg.
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*
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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 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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*/
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/**
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* @file
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* Audio merging filter
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*/
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#include "libswresample/swresample.h" // only for SWR_CH_MAX
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#include "avfilter.h"
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#include "audio.h"
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#include "internal.h"
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#define QUEUE_SIZE 16
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typedef struct {
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int nb_in_ch[2]; /**< number of channels for each input */
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int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */
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int bps;
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struct amerge_queue {
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AVFilterBufferRef *buf[QUEUE_SIZE];
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int nb_buf, nb_samples, pos;
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} queue[2];
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} AMergeContext;
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AMergeContext *am = ctx->priv;
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int i, j;
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for (i = 0; i < 2; i++)
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for (j = 0; j < am->queue[i].nb_buf; j++)
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avfilter_unref_buffer(am->queue[i].buf[j]);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AMergeContext *am = ctx->priv;
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int64_t inlayout[2], outlayout;
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AVFilterFormats *formats;
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AVFilterChannelLayouts *layouts;
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int i;
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for (i = 0; i < 2; i++) {
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if (!ctx->inputs[i]->in_channel_layouts ||
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!ctx->inputs[i]->in_channel_layouts->nb_channel_layouts) {
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av_log(ctx, AV_LOG_ERROR,
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"No channel layout for input %d\n", i + 1);
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return AVERROR(EINVAL);
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}
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inlayout[i] = ctx->inputs[i]->in_channel_layouts->channel_layouts[0];
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if (ctx->inputs[i]->in_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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am->nb_in_ch[i] = av_get_channel_layout_nb_channels(inlayout[i]);
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}
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if (am->nb_in_ch[0] + am->nb_in_ch[1] > 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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}
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if (inlayout[0] & inlayout[1]) {
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av_log(ctx, AV_LOG_WARNING,
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"Inputs overlap: output layout will be meaningless\n");
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for (i = 0; i < am->nb_in_ch[0] + am->nb_in_ch[1]; i++)
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am->route[i] = i;
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outlayout = av_get_default_channel_layout(am->nb_in_ch[0] +
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am->nb_in_ch[1]);
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if (!outlayout)
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outlayout = ((int64_t)1 << (am->nb_in_ch[0] + am->nb_in_ch[1])) - 1;
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} else {
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int *route[2] = { am->route, am->route + am->nb_in_ch[0] };
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int c, out_ch_number = 0;
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outlayout = inlayout[0] | inlayout[1];
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for (c = 0; c < 64; c++)
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for (i = 0; i < 2; i++)
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if ((inlayout[i] >> c) & 1)
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*(route[i]++) = out_ch_number++;
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}
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formats = avfilter_make_format_list(ff_packed_sample_fmts);
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avfilter_set_common_sample_formats(ctx, formats);
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for (i = 0; i < 2; i++) {
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layouts = NULL;
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ff_add_channel_layout(&layouts, inlayout[i]);
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ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts);
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}
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layouts = NULL;
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ff_add_channel_layout(&layouts, outlayout);
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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;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AMergeContext *am = ctx->priv;
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int64_t layout;
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char name[3][256];
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int i;
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if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {
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av_log(ctx, AV_LOG_ERROR,
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"Inputs must have the same sample rate "
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"(%"PRIi64" vs %"PRIi64")\n",
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ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate);
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return AVERROR(EINVAL);
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}
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am->bps = av_get_bytes_per_sample(ctx->outputs[0]->format);
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outlink->sample_rate = ctx->inputs[0]->sample_rate;
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outlink->time_base = ctx->inputs[0]->time_base;
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for (i = 0; i < 3; i++) {
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layout = (i < 2 ? ctx->inputs[i] : ctx->outputs[0])->channel_layout;
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av_get_channel_layout_string(name[i], sizeof(name[i]), -1, layout);
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}
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av_log(ctx, AV_LOG_INFO,
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"in1:%s + in2:%s -> out:%s\n", name[0], name[1], name[2]);
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AMergeContext *am = ctx->priv;
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int i, ret;
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for (i = 0; i < 2; i++)
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if (!am->queue[i].nb_samples)
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if ((ret = avfilter_request_frame(ctx->inputs[i])) < 0)
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return ret;
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return 0;
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}
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/**
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* Copy samples from two input streams to one output stream.
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* @param nb_in_ch number of channels in each input stream
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* @param route routing values;
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* input channel i goes to output channel route[i];
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* i < nb_in_ch[0] are the channels from the first output;
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* i >= nb_in_ch[0] are the channels from the second output
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* @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
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* @param outs pointer to the samples of the output, in packet format;
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* must point to a buffer big enough;
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* will be left at the end of the copied samples
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* @param ns number of samples to copy
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* @param bps bytes per sample
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*/
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static inline void copy_samples(int nb_in_ch[2], int *route, uint8_t *ins[2],
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uint8_t **outs, int ns, int bps)
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{
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int *route_cur;
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int i, c;
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while (ns--) {
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route_cur = route;
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for (i = 0; i < 2; i++) {
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for (c = 0; c < nb_in_ch[i]; c++) {
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memcpy((*outs) + bps * *(route_cur++), ins[i], bps);
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ins[i] += bps;
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}
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}
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*outs += (nb_in_ch[0] + nb_in_ch[1]) * bps;
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}
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}
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static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
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{
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AVFilterContext *ctx = inlink->dst;
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AMergeContext *am = ctx->priv;
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AVFilterLink *const outlink = ctx->outputs[0];
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int input_number = inlink == ctx->inputs[1];
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struct amerge_queue *inq = &am->queue[input_number];
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int nb_samples, ns, i;
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AVFilterBufferRef *outbuf, **inbuf[2];
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uint8_t *ins[2], *outs;
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if (inq->nb_buf == QUEUE_SIZE) {
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av_log(ctx, AV_LOG_ERROR, "Packet queue overflow; dropped\n");
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avfilter_unref_buffer(insamples);
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return;
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}
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inq->buf[inq->nb_buf++] = avfilter_ref_buffer(insamples, AV_PERM_READ |
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AV_PERM_PRESERVE);
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inq->nb_samples += insamples->audio->nb_samples;
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avfilter_unref_buffer(insamples);
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if (!am->queue[!input_number].nb_samples)
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return;
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nb_samples = FFMIN(am->queue[0].nb_samples,
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am->queue[1].nb_samples);
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outbuf = ff_get_audio_buffer(ctx->outputs[0], AV_PERM_WRITE,
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nb_samples);
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outs = outbuf->data[0];
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for (i = 0; i < 2; i++) {
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inbuf[i] = am->queue[i].buf;
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ins[i] = (*inbuf[i])->data[0] +
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am->queue[i].pos * am->nb_in_ch[i] * am->bps;
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}
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outbuf->pts = (*inbuf[0])->pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
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(*inbuf[0])->pts +
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av_rescale_q(am->queue[0].pos,
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(AVRational){ 1, ctx->inputs[0]->sample_rate },
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ctx->outputs[0]->time_base);
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avfilter_copy_buffer_ref_props(outbuf, *inbuf[0]);
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outbuf->audio->nb_samples = nb_samples;
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outbuf->audio->channel_layout = outlink->channel_layout;
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while (nb_samples) {
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ns = nb_samples;
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for (i = 0; i < 2; i++)
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ns = FFMIN(ns, (*inbuf[i])->audio->nb_samples - am->queue[i].pos);
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/* Unroll the most common sample formats: speed +~350% for the loop,
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+~13% overall (including two common decoders) */
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switch (am->bps) {
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case 1:
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copy_samples(am->nb_in_ch, am->route, ins, &outs, ns, 1);
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break;
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case 2:
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copy_samples(am->nb_in_ch, am->route, ins, &outs, ns, 2);
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break;
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case 4:
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copy_samples(am->nb_in_ch, am->route, ins, &outs, ns, 4);
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break;
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default:
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copy_samples(am->nb_in_ch, am->route, ins, &outs, ns, am->bps);
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break;
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}
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nb_samples -= ns;
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for (i = 0; i < 2; i++) {
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am->queue[i].nb_samples -= ns;
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am->queue[i].pos += ns;
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if (am->queue[i].pos == (*inbuf[i])->audio->nb_samples) {
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am->queue[i].pos = 0;
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avfilter_unref_buffer(*inbuf[i]);
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*inbuf[i] = NULL;
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inbuf[i]++;
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ins[i] = *inbuf[i] ? (*inbuf[i])->data[0] : NULL;
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}
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}
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}
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for (i = 0; i < 2; i++) {
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int nbufused = inbuf[i] - am->queue[i].buf;
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if (nbufused) {
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am->queue[i].nb_buf -= nbufused;
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memmove(am->queue[i].buf, inbuf[i],
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am->queue[i].nb_buf * sizeof(**inbuf));
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}
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}
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ff_filter_samples(ctx->outputs[0], outbuf);
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}
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AVFilter avfilter_af_amerge = {
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.name = "amerge",
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.description = NULL_IF_CONFIG_SMALL("Merge two audio streams into "
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"a single multi-channel stream."),
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.priv_size = sizeof(AMergeContext),
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = (const AVFilterPad[]) {
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{ .name = "in1",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_samples = filter_samples,
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.min_perms = AV_PERM_READ, },
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{ .name = "in2",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_samples = filter_samples,
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.min_perms = AV_PERM_READ, },
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{ .name = NULL }
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},
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.outputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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.request_frame = request_frame, },
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{ .name = NULL }
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},
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};
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