| /* |
| * 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 "libswresample/swresample.h" // only for SWR_CH_MAX |
| #include "avfilter.h" |
| #include "internal.h" |
| |
| #define QUEUE_SIZE 16 |
| |
| typedef struct { |
| int nb_in_ch[2]; /**< number of channels for each input */ |
| int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */ |
| int bps; |
| struct amerge_queue { |
| AVFilterBufferRef *buf[QUEUE_SIZE]; |
| int nb_buf, nb_samples, pos; |
| } queue[2]; |
| } AMergeContext; |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| AMergeContext *am = ctx->priv; |
| int i, j; |
| |
| for (i = 0; i < 2; i++) |
| for (j = 0; j < am->queue[i].nb_buf; j++) |
| avfilter_unref_buffer(am->queue[i].buf[j]); |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AMergeContext *am = ctx->priv; |
| int64_t inlayout[2], outlayout; |
| const int packing_fmts[] = { AVFILTER_PACKED, -1 }; |
| AVFilterFormats *formats; |
| int i; |
| |
| for (i = 0; i < 2; i++) { |
| if (!ctx->inputs[i]->in_chlayouts || |
| !ctx->inputs[i]->in_chlayouts->format_count) { |
| av_log(ctx, AV_LOG_ERROR, |
| "No channel layout for input %d\n", i + 1); |
| return AVERROR(EINVAL); |
| } |
| inlayout[i] = ctx->inputs[i]->in_chlayouts->formats[0]; |
| if (ctx->inputs[i]->in_chlayouts->format_count > 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->nb_in_ch[i] = av_get_channel_layout_nb_channels(inlayout[i]); |
| } |
| if (am->nb_in_ch[0] + am->nb_in_ch[1] > SWR_CH_MAX) { |
| av_log(ctx, AV_LOG_ERROR, "Too many channels (max %d)\n", SWR_CH_MAX); |
| return AVERROR(EINVAL); |
| } |
| if (inlayout[0] & inlayout[1]) { |
| av_log(ctx, AV_LOG_WARNING, |
| "Inputs overlap: output layout will be meaningless\n"); |
| for (i = 0; i < am->nb_in_ch[0] + am->nb_in_ch[1]; i++) |
| am->route[i] = i; |
| outlayout = av_get_default_channel_layout(am->nb_in_ch[0] + |
| am->nb_in_ch[1]); |
| if (!outlayout) |
| outlayout = ((int64_t)1 << (am->nb_in_ch[0] + am->nb_in_ch[1])) - 1; |
| } else { |
| int *route[2] = { am->route, am->route + am->nb_in_ch[0] }; |
| int c, out_ch_number = 0; |
| |
| outlayout = inlayout[0] | inlayout[1]; |
| for (c = 0; c < 64; c++) |
| for (i = 0; i < 2; i++) |
| if ((inlayout[i] >> c) & 1) |
| *(route[i]++) = out_ch_number++; |
| } |
| formats = avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO); |
| avfilter_set_common_sample_formats(ctx, formats); |
| formats = avfilter_make_format_list(packing_fmts); |
| avfilter_set_common_packing_formats(ctx, formats); |
| for (i = 0; i < 2; i++) { |
| formats = NULL; |
| avfilter_add_format(&formats, inlayout[i]); |
| avfilter_formats_ref(formats, &ctx->inputs[i]->out_chlayouts); |
| } |
| formats = NULL; |
| avfilter_add_format(&formats, outlayout); |
| avfilter_formats_ref(formats, &ctx->outputs[0]->in_chlayouts); |
| return 0; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AMergeContext *am = ctx->priv; |
| int64_t layout; |
| char name[3][256]; |
| int i; |
| |
| if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Inputs must have the same sample rate " |
| "(%"PRIi64" vs %"PRIi64")\n", |
| ctx->inputs[0]->sample_rate, ctx->inputs[1]->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; |
| for (i = 0; i < 3; i++) { |
| layout = (i < 2 ? ctx->inputs[i] : ctx->outputs[0])->channel_layout; |
| av_get_channel_layout_string(name[i], sizeof(name[i]), -1, layout); |
| } |
| av_log(ctx, AV_LOG_INFO, |
| "in1:%s + in2:%s -> out:%s\n", name[0], name[1], name[2]); |
| return 0; |
| } |
| |
| static int request_frame(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AMergeContext *am = ctx->priv; |
| int i; |
| |
| for (i = 0; i < 2; i++) |
| if (!am->queue[i].nb_samples) |
| avfilter_request_frame(ctx->inputs[i]); |
| return 0; |
| } |
| |
| /** |
| * Copy samples from two input streams to one output stream. |
| * @param nb_in_ch number of channels in each input stream |
| * @param route routing values; |
| * input channel i goes to output channel route[i]; |
| * i < nb_in_ch[0] are the channels from the first output; |
| * i >= nb_in_ch[0] 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_in_ch[2], int *route, uint8_t *ins[2], |
| uint8_t **outs, int ns, int bps) |
| { |
| int *route_cur; |
| int i, c; |
| |
| while (ns--) { |
| route_cur = route; |
| for (i = 0; i < 2; i++) { |
| for (c = 0; c < nb_in_ch[i]; c++) { |
| memcpy((*outs) + bps * *(route_cur++), ins[i], bps); |
| ins[i] += bps; |
| } |
| } |
| *outs += (nb_in_ch[0] + nb_in_ch[1]) * bps; |
| } |
| } |
| |
| static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AMergeContext *am = ctx->priv; |
| int input_number = inlink == ctx->inputs[1]; |
| struct amerge_queue *inq = &am->queue[input_number]; |
| int nb_samples, ns, i; |
| AVFilterBufferRef *outbuf, **inbuf[2]; |
| uint8_t *ins[2], *outs; |
| |
| if (inq->nb_buf == QUEUE_SIZE) { |
| av_log(ctx, AV_LOG_ERROR, "Packet queue overflow; dropped\n"); |
| avfilter_unref_buffer(insamples); |
| return; |
| } |
| inq->buf[inq->nb_buf++] = avfilter_ref_buffer(insamples, AV_PERM_READ | |
| AV_PERM_PRESERVE); |
| inq->nb_samples += insamples->audio->nb_samples; |
| avfilter_unref_buffer(insamples); |
| if (!am->queue[!input_number].nb_samples) |
| return; |
| |
| nb_samples = FFMIN(am->queue[0].nb_samples, |
| am->queue[1].nb_samples); |
| outbuf = avfilter_get_audio_buffer(ctx->outputs[0], AV_PERM_WRITE, |
| nb_samples); |
| outs = outbuf->data[0]; |
| for (i = 0; i < 2; i++) { |
| inbuf[i] = am->queue[i].buf; |
| ins[i] = (*inbuf[i])->data[0] + |
| am->queue[i].pos * am->nb_in_ch[i] * am->bps; |
| } |
| while (nb_samples) { |
| ns = nb_samples; |
| for (i = 0; i < 2; i++) |
| ns = FFMIN(ns, (*inbuf[i])->audio->nb_samples - am->queue[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_in_ch, am->route, ins, &outs, ns, 1); |
| break; |
| case 2: |
| copy_samples(am->nb_in_ch, am->route, ins, &outs, ns, 2); |
| break; |
| case 4: |
| copy_samples(am->nb_in_ch, am->route, ins, &outs, ns, 4); |
| break; |
| default: |
| copy_samples(am->nb_in_ch, am->route, ins, &outs, ns, am->bps); |
| break; |
| } |
| |
| nb_samples -= ns; |
| for (i = 0; i < 2; i++) { |
| am->queue[i].nb_samples -= ns; |
| am->queue[i].pos += ns; |
| if (am->queue[i].pos == (*inbuf[i])->audio->nb_samples) { |
| am->queue[i].pos = 0; |
| avfilter_unref_buffer(*inbuf[i]); |
| *inbuf[i] = NULL; |
| inbuf[i]++; |
| ins[i] = *inbuf[i] ? (*inbuf[i])->data[0] : NULL; |
| } |
| } |
| } |
| for (i = 0; i < 2; i++) { |
| int nbufused = inbuf[i] - am->queue[i].buf; |
| if (nbufused) { |
| am->queue[i].nb_buf -= nbufused; |
| memmove(am->queue[i].buf, inbuf[i], |
| am->queue[i].nb_buf * sizeof(**inbuf)); |
| } |
| } |
| avfilter_filter_samples(ctx->outputs[0], outbuf); |
| } |
| |
| 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), |
| .uninit = uninit, |
| .query_formats = query_formats, |
| |
| .inputs = (const AVFilterPad[]) { |
| { .name = "in1", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_samples = filter_samples, |
| .min_perms = AV_PERM_READ, }, |
| { .name = "in2", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_samples = filter_samples, |
| .min_perms = AV_PERM_READ, }, |
| { .name = NULL } |
| }, |
| .outputs = (const AVFilterPad[]) { |
| { .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .config_props = config_output, |
| .request_frame = request_frame, }, |
| { .name = NULL } |
| }, |
| }; |