/* * 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 Lesser 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/avstring.h" #include "libavutil/bprint.h" #include "libavutil/channel_layout.h" #include "libavutil/opt.h" #include "avfilter.h" #include "filters.h" #include "audio.h" #include "internal.h" #define SWR_CH_MAX 64 typedef struct AMergeContext { const AVClass *class; int nb_inputs; int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */ int bps; struct amerge_input { int nb_ch; /**< number of channels for the input */ } *in; } AMergeContext; #define OFFSET(x) offsetof(AMergeContext, x) #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM static const AVOption amerge_options[] = { { "inputs", "specify the number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, SWR_CH_MAX, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(amerge); static av_cold void uninit(AVFilterContext *ctx) { AMergeContext *s = ctx->priv; av_freep(&s->in); } static int query_formats(AVFilterContext *ctx) { static const enum AVSampleFormat packed_sample_fmts[] = { AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_NONE }; AMergeContext *s = ctx->priv; int64_t inlayout[SWR_CH_MAX], outlayout = 0; AVFilterChannelLayouts *layouts; int i, ret, overlap = 0, nb_ch = 0; for (i = 0; i < s->nb_inputs; i++) { if (!ctx->inputs[i]->incfg.channel_layouts || !ctx->inputs[i]->incfg.channel_layouts->nb_channel_layouts) { av_log(ctx, AV_LOG_WARNING, "No channel layout for input %d\n", i + 1); return AVERROR(EAGAIN); } inlayout[i] = ctx->inputs[i]->incfg.channel_layouts->channel_layouts[0]; if (ctx->inputs[i]->incfg.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); } s->in[i].nb_ch = FF_LAYOUT2COUNT(inlayout[i]); if (s->in[i].nb_ch) { overlap++; } else { s->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]); if (outlayout & inlayout[i]) overlap++; outlayout |= inlayout[i]; } nb_ch += s->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, "Input channel layouts overlap: " "output layout will be determined by the number of distinct input channels\n"); for (i = 0; i < nb_ch; i++) s->route[i] = i; outlayout = av_get_default_channel_layout(nb_ch); if (!outlayout && nb_ch) outlayout = 0xFFFFFFFFFFFFFFFFULL >> (64 - nb_ch); } else { int *route[SWR_CH_MAX]; int c, out_ch_number = 0; route[0] = s->route; for (i = 1; i < s->nb_inputs; i++) route[i] = route[i - 1] + s->in[i - 1].nb_ch; for (c = 0; c < 64; c++) for (i = 0; i < s->nb_inputs; i++) if ((inlayout[i] >> c) & 1) *(route[i]++) = out_ch_number++; } if ((ret = ff_set_common_formats_from_list(ctx, packed_sample_fmts)) < 0) return ret; for (i = 0; i < s->nb_inputs; i++) { layouts = NULL; if ((ret = ff_add_channel_layout(&layouts, inlayout[i])) < 0) return ret; if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0) return ret; } layouts = NULL; if ((ret = ff_add_channel_layout(&layouts, outlayout)) < 0) return ret; if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0) return ret; return ff_set_common_all_samplerates(ctx); } static int config_output(AVFilterLink *outlink) { AVFilterContext *ctx = outlink->src; AMergeContext *s = ctx->priv; AVBPrint bp; int i; s->bps = av_get_bytes_per_sample(ctx->outputs[0]->format); outlink->time_base = ctx->inputs[0]->time_base; av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC); for (i = 0; i < s->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_VERBOSE, "%s\n", bp.str); 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 void free_frames(int nb_inputs, AVFrame **input_frames) { int i; for (i = 0; i < nb_inputs; i++) av_frame_free(&input_frames[i]); } static int try_push_frame(AVFilterContext *ctx, int nb_samples) { AMergeContext *s = ctx->priv; AVFilterLink *outlink = ctx->outputs[0]; int i, ret; AVFrame *outbuf, *inbuf[SWR_CH_MAX] = { NULL }; uint8_t *outs, *ins[SWR_CH_MAX]; for (i = 0; i < ctx->nb_inputs; i++) { ret = ff_inlink_consume_samples(ctx->inputs[i], nb_samples, nb_samples, &inbuf[i]); if (ret < 0) { free_frames(i, inbuf); return ret; } ins[i] = inbuf[i]->data[0]; } outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples); if (!outbuf) { free_frames(s->nb_inputs, inbuf); return AVERROR(ENOMEM); } outs = outbuf->data[0]; outbuf->pts = inbuf[0]->pts; outbuf->nb_samples = nb_samples; outbuf->channel_layout = outlink->channel_layout; outbuf->channels = outlink->channels; while (nb_samples) { /* Unroll the most common sample formats: speed +~350% for the loop, +~13% overall (including two common decoders) */ switch (s->bps) { case 1: copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 1); break; case 2: copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 2); break; case 4: copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, 4); break; default: copy_samples(s->nb_inputs, s->in, s->route, ins, &outs, nb_samples, s->bps); break; } nb_samples = 0; } free_frames(s->nb_inputs, inbuf); return ff_filter_frame(ctx->outputs[0], outbuf); } static int activate(AVFilterContext *ctx) { int i, status; int ret, nb_samples; int64_t pts; FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx); nb_samples = ff_inlink_queued_samples(ctx->inputs[0]); for (i = 1; i < ctx->nb_inputs && nb_samples > 0; i++) { nb_samples = FFMIN(ff_inlink_queued_samples(ctx->inputs[i]), nb_samples); } if (nb_samples) { ret = try_push_frame(ctx, nb_samples); if (ret < 0) return ret; } for (i = 0; i < ctx->nb_inputs; i++) { if (ff_inlink_queued_samples(ctx->inputs[i])) continue; if (ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts)) { ff_outlink_set_status(ctx->outputs[0], status, pts); return 0; } else if (ff_outlink_frame_wanted(ctx->outputs[0])) { ff_inlink_request_frame(ctx->inputs[i]); return 0; } } return 0; } static av_cold int init(AVFilterContext *ctx) { AMergeContext *s = ctx->priv; int i, ret; s->in = av_calloc(s->nb_inputs, sizeof(*s->in)); if (!s->in) return AVERROR(ENOMEM); for (i = 0; i < s->nb_inputs; i++) { char *name = av_asprintf("in%d", i); AVFilterPad pad = { .name = name, .type = AVMEDIA_TYPE_AUDIO, }; if (!name) return AVERROR(ENOMEM); if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0) return ret; } return 0; } static const AVFilterPad amerge_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_AUDIO, .config_props = config_output, }, }; const AVFilter ff_af_amerge = { .name = "amerge", .description = NULL_IF_CONFIG_SMALL("Merge two or more audio streams into " "a single multi-channel stream."), .priv_size = sizeof(AMergeContext), .init = init, .uninit = uninit, .activate = activate, .inputs = NULL, FILTER_OUTPUTS(amerge_outputs), FILTER_QUERY_FUNC(query_formats), .priv_class = &amerge_class, .flags = AVFILTER_FLAG_DYNAMIC_INPUTS, };