Nicolas George
14 years ago
parent
e90a69e955
commit
4962edf889
6 changed files with 325 additions and 1 deletions
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/*
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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 "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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const int packing_fmts[] = { AVFILTER_PACKED, -1 }; |
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AVFilterFormats *formats; |
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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_chlayouts || |
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!ctx->inputs[i]->in_chlayouts->format_count) { |
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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_chlayouts->formats[0]; |
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if (ctx->inputs[i]->in_chlayouts->format_count > 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_all_formats(AVMEDIA_TYPE_AUDIO); |
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avfilter_set_common_sample_formats(ctx, formats); |
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formats = avfilter_make_format_list(packing_fmts); |
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avfilter_set_common_packing_formats(ctx, formats); |
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for (i = 0; i < 2; i++) { |
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formats = NULL; |
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avfilter_add_format(&formats, inlayout[i]); |
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avfilter_formats_ref(formats, &ctx->inputs[i]->out_chlayouts); |
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} |
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formats = NULL; |
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avfilter_add_format(&formats, outlayout); |
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avfilter_formats_ref(formats, &ctx->outputs[0]->in_chlayouts); |
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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; |
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for (i = 0; i < 2; i++) |
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if (!am->queue[i].nb_samples) |
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avfilter_request_frame(ctx->inputs[i]); |
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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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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 = avfilter_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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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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avfilter_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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