yading@10: /*
yading@10:  * Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
yading@10:  * GNU Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Audio merging filter
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/bprint.h"
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libswresample/swresample.h" // only for SWR_CH_MAX
yading@10: #include "avfilter.h"
yading@10: #include "audio.h"
yading@10: #include "bufferqueue.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     int nb_inputs;
yading@10:     int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */
yading@10:     int bps;
yading@10:     struct amerge_input {
yading@10:         struct FFBufQueue queue;
yading@10:         int nb_ch;         /**< number of channels for the input */
yading@10:         int nb_samples;
yading@10:         int pos;
yading@10:     } *in;
yading@10: } AMergeContext;
yading@10: 
yading@10: #define OFFSET(x) offsetof(AMergeContext, x)
yading@10: #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
yading@10: 
yading@10: static const AVOption amerge_options[] = {
yading@10:     { "inputs", "specify the number of inputs", OFFSET(nb_inputs),
yading@10:       AV_OPT_TYPE_INT, { .i64 = 2 }, 2, SWR_CH_MAX, FLAGS },
yading@10:     {0}
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(amerge);
yading@10: 
yading@10: static av_cold void uninit(AVFilterContext *ctx)
yading@10: {
yading@10:     AMergeContext *am = ctx->priv;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < am->nb_inputs; i++) {
yading@10:         if (am->in)
yading@10:             ff_bufqueue_discard_all(&am->in[i].queue);
yading@10:         if (ctx->input_pads)
yading@10:             av_freep(&ctx->input_pads[i].name);
yading@10:     }
yading@10:     av_freep(&am->in);
yading@10: }
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     AMergeContext *am = ctx->priv;
yading@10:     int64_t inlayout[SWR_CH_MAX], outlayout = 0;
yading@10:     AVFilterFormats *formats;
yading@10:     AVFilterChannelLayouts *layouts;
yading@10:     int i, overlap = 0, nb_ch = 0;
yading@10: 
yading@10:     for (i = 0; i < am->nb_inputs; i++) {
yading@10:         if (!ctx->inputs[i]->in_channel_layouts ||
yading@10:             !ctx->inputs[i]->in_channel_layouts->nb_channel_layouts) {
yading@10:             av_log(ctx, AV_LOG_WARNING,
yading@10:                    "No channel layout for input %d\n", i + 1);
yading@10:             return AVERROR(EAGAIN);
yading@10:         }
yading@10:         inlayout[i] = ctx->inputs[i]->in_channel_layouts->channel_layouts[0];
yading@10:         if (ctx->inputs[i]->in_channel_layouts->nb_channel_layouts > 1) {
yading@10:             char buf[256];
yading@10:             av_get_channel_layout_string(buf, sizeof(buf), 0, inlayout[i]);
yading@10:             av_log(ctx, AV_LOG_INFO, "Using \"%s\" for input %d\n", buf, i + 1);
yading@10:         }
yading@10:         am->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]);
yading@10:         if (outlayout & inlayout[i])
yading@10:             overlap++;
yading@10:         outlayout |= inlayout[i];
yading@10:         nb_ch += am->in[i].nb_ch;
yading@10:     }
yading@10:     if (nb_ch > SWR_CH_MAX) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Too many channels (max %d)\n", SWR_CH_MAX);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     if (overlap) {
yading@10:         av_log(ctx, AV_LOG_WARNING,
yading@10:                "Input channel layouts overlap: "
yading@10:                "output layout will be determined by the number of distinct input channels\n");
yading@10:         for (i = 0; i < nb_ch; i++)
yading@10:             am->route[i] = i;
yading@10:         outlayout = av_get_default_channel_layout(nb_ch);
yading@10:         if (!outlayout)
yading@10:             outlayout = ((int64_t)1 << nb_ch) - 1;
yading@10:     } else {
yading@10:         int *route[SWR_CH_MAX];
yading@10:         int c, out_ch_number = 0;
yading@10: 
yading@10:         route[0] = am->route;
yading@10:         for (i = 1; i < am->nb_inputs; i++)
yading@10:             route[i] = route[i - 1] + am->in[i - 1].nb_ch;
yading@10:         for (c = 0; c < 64; c++)
yading@10:             for (i = 0; i < am->nb_inputs; i++)
yading@10:                 if ((inlayout[i] >> c) & 1)
yading@10:                     *(route[i]++) = out_ch_number++;
yading@10:     }
yading@10:     formats = ff_make_format_list(ff_packed_sample_fmts_array);
yading@10:     ff_set_common_formats(ctx, formats);
yading@10:     for (i = 0; i < am->nb_inputs; i++) {
yading@10:         layouts = NULL;
yading@10:         ff_add_channel_layout(&layouts, inlayout[i]);
yading@10:         ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts);
yading@10:     }
yading@10:     layouts = NULL;
yading@10:     ff_add_channel_layout(&layouts, outlayout);
yading@10:     ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);
yading@10:     ff_set_common_samplerates(ctx, ff_all_samplerates());
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int config_output(AVFilterLink *outlink)
yading@10: {
yading@10:     AVFilterContext *ctx = outlink->src;
yading@10:     AMergeContext *am = ctx->priv;
yading@10:     AVBPrint bp;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 1; i < am->nb_inputs; i++) {
yading@10:         if (ctx->inputs[i]->sample_rate != ctx->inputs[0]->sample_rate) {
yading@10:             av_log(ctx, AV_LOG_ERROR,
yading@10:                    "Inputs must have the same sample rate "
yading@10:                    "%d for in%d vs %d\n",
yading@10:                    ctx->inputs[i]->sample_rate, i, ctx->inputs[0]->sample_rate);
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:     }
yading@10:     am->bps = av_get_bytes_per_sample(ctx->outputs[0]->format);
yading@10:     outlink->sample_rate = ctx->inputs[0]->sample_rate;
yading@10:     outlink->time_base   = ctx->inputs[0]->time_base;
yading@10: 
yading@10:     av_bprint_init(&bp, 0, 1);
yading@10:     for (i = 0; i < am->nb_inputs; i++) {
yading@10:         av_bprintf(&bp, "%sin%d:", i ? " + " : "", i);
yading@10:         av_bprint_channel_layout(&bp, -1, ctx->inputs[i]->channel_layout);
yading@10:     }
yading@10:     av_bprintf(&bp, " -> out:");
yading@10:     av_bprint_channel_layout(&bp, -1, ctx->outputs[0]->channel_layout);
yading@10:     av_log(ctx, AV_LOG_VERBOSE, "%s\n", bp.str);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int request_frame(AVFilterLink *outlink)
yading@10: {
yading@10:     AVFilterContext *ctx = outlink->src;
yading@10:     AMergeContext *am = ctx->priv;
yading@10:     int i, ret;
yading@10: 
yading@10:     for (i = 0; i < am->nb_inputs; i++)
yading@10:         if (!am->in[i].nb_samples)
yading@10:             if ((ret = ff_request_frame(ctx->inputs[i])) < 0)
yading@10:                 return ret;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Copy samples from several input streams to one output stream.
yading@10:  * @param nb_inputs number of inputs
yading@10:  * @param in        inputs; used only for the nb_ch field;
yading@10:  * @param route     routing values;
yading@10:  *                  input channel i goes to output channel route[i];
yading@10:  *                  i <  in[0].nb_ch are the channels from the first output;
yading@10:  *                  i >= in[0].nb_ch are the channels from the second output
yading@10:  * @param ins       pointer to the samples of each inputs, in packed format;
yading@10:  *                  will be left at the end of the copied samples
yading@10:  * @param outs      pointer to the samples of the output, in packet format;
yading@10:  *                  must point to a buffer big enough;
yading@10:  *                  will be left at the end of the copied samples
yading@10:  * @param ns        number of samples to copy
yading@10:  * @param bps       bytes per sample
yading@10:  */
yading@10: static inline void copy_samples(int nb_inputs, struct amerge_input in[],
yading@10:                                 int *route, uint8_t *ins[],
yading@10:                                 uint8_t **outs, int ns, int bps)
yading@10: {
yading@10:     int *route_cur;
yading@10:     int i, c, nb_ch = 0;
yading@10: 
yading@10:     for (i = 0; i < nb_inputs; i++)
yading@10:         nb_ch += in[i].nb_ch;
yading@10:     while (ns--) {
yading@10:         route_cur = route;
yading@10:         for (i = 0; i < nb_inputs; i++) {
yading@10:             for (c = 0; c < in[i].nb_ch; c++) {
yading@10:                 memcpy((*outs) + bps * *(route_cur++), ins[i], bps);
yading@10:                 ins[i] += bps;
yading@10:             }
yading@10:         }
yading@10:         *outs += nb_ch * bps;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     AMergeContext *am = ctx->priv;
yading@10:     AVFilterLink *const outlink = ctx->outputs[0];
yading@10:     int input_number;
yading@10:     int nb_samples, ns, i;
yading@10:     AVFrame *outbuf, *inbuf[SWR_CH_MAX];
yading@10:     uint8_t *ins[SWR_CH_MAX], *outs;
yading@10: 
yading@10:     for (input_number = 0; input_number < am->nb_inputs; input_number++)
yading@10:         if (inlink == ctx->inputs[input_number])
yading@10:             break;
yading@10:     av_assert1(input_number < am->nb_inputs);
yading@10:     if (ff_bufqueue_is_full(&am->in[input_number].queue)) {
yading@10:         av_frame_free(&insamples);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10:     ff_bufqueue_add(ctx, &am->in[input_number].queue, av_frame_clone(insamples));
yading@10:     am->in[input_number].nb_samples += insamples->nb_samples;
yading@10:     av_frame_free(&insamples);
yading@10:     nb_samples = am->in[0].nb_samples;
yading@10:     for (i = 1; i < am->nb_inputs; i++)
yading@10:         nb_samples = FFMIN(nb_samples, am->in[i].nb_samples);
yading@10:     if (!nb_samples)
yading@10:         return 0;
yading@10: 
yading@10:     outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
yading@10:     if (!outbuf)
yading@10:         return AVERROR(ENOMEM);
yading@10:     outs = outbuf->data[0];
yading@10:     for (i = 0; i < am->nb_inputs; i++) {
yading@10:         inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);
yading@10:         ins[i] = inbuf[i]->data[0] +
yading@10:                  am->in[i].pos * am->in[i].nb_ch * am->bps;
yading@10:     }
yading@10:     av_frame_copy_props(outbuf, inbuf[0]);
yading@10:     outbuf->pts = inbuf[0]->pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
yading@10:                   inbuf[0]->pts +
yading@10:                   av_rescale_q(am->in[0].pos,
yading@10:                                (AVRational){ 1, ctx->inputs[0]->sample_rate },
yading@10:                                ctx->outputs[0]->time_base);
yading@10: 
yading@10:     outbuf->nb_samples     = nb_samples;
yading@10:     outbuf->channel_layout = outlink->channel_layout;
yading@10:     av_frame_set_channels(outbuf, outlink->channels);
yading@10: 
yading@10:     while (nb_samples) {
yading@10:         ns = nb_samples;
yading@10:         for (i = 0; i < am->nb_inputs; i++)
yading@10:             ns = FFMIN(ns, inbuf[i]->nb_samples - am->in[i].pos);
yading@10:         /* Unroll the most common sample formats: speed +~350% for the loop,
yading@10:            +~13% overall (including two common decoders) */
yading@10:         switch (am->bps) {
yading@10:             case 1:
yading@10:                 copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 1);
yading@10:                 break;
yading@10:             case 2:
yading@10:                 copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 2);
yading@10:                 break;
yading@10:             case 4:
yading@10:                 copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 4);
yading@10:                 break;
yading@10:             default:
yading@10:                 copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, am->bps);
yading@10:                 break;
yading@10:         }
yading@10: 
yading@10:         nb_samples -= ns;
yading@10:         for (i = 0; i < am->nb_inputs; i++) {
yading@10:             am->in[i].nb_samples -= ns;
yading@10:             am->in[i].pos += ns;
yading@10:             if (am->in[i].pos == inbuf[i]->nb_samples) {
yading@10:                 am->in[i].pos = 0;
yading@10:                 av_frame_free(&inbuf[i]);
yading@10:                 ff_bufqueue_get(&am->in[i].queue);
yading@10:                 inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);
yading@10:                 ins[i] = inbuf[i] ? inbuf[i]->data[0] : NULL;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     return ff_filter_frame(ctx->outputs[0], outbuf);
yading@10: }
yading@10: 
yading@10: static av_cold int init(AVFilterContext *ctx)
yading@10: {
yading@10:     AMergeContext *am = ctx->priv;
yading@10:     int i;
yading@10: 
yading@10:     am->in = av_calloc(am->nb_inputs, sizeof(*am->in));
yading@10:     if (!am->in)
yading@10:         return AVERROR(ENOMEM);
yading@10:     for (i = 0; i < am->nb_inputs; i++) {
yading@10:         char *name = av_asprintf("in%d", i);
yading@10:         AVFilterPad pad = {
yading@10:             .name             = name,
yading@10:             .type             = AVMEDIA_TYPE_AUDIO,
yading@10:             .filter_frame     = filter_frame,
yading@10:         };
yading@10:         if (!name)
yading@10:             return AVERROR(ENOMEM);
yading@10:         ff_insert_inpad(ctx, i, &pad);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const AVFilterPad amerge_outputs[] = {
yading@10:     {
yading@10:         .name          = "default",
yading@10:         .type          = AVMEDIA_TYPE_AUDIO,
yading@10:         .config_props  = config_output,
yading@10:         .request_frame = request_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_af_amerge = {
yading@10:     .name          = "amerge",
yading@10:     .description   = NULL_IF_CONFIG_SMALL("Merge two or more audio streams into "
yading@10:                                           "a single multi-channel stream."),
yading@10:     .priv_size     = sizeof(AMergeContext),
yading@10:     .init          = init,
yading@10:     .uninit        = uninit,
yading@10:     .query_formats = query_formats,
yading@10:     .inputs        = NULL,
yading@10:     .outputs       = amerge_outputs,
yading@10:     .priv_class    = &amerge_class,
yading@10:     .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,
yading@10: };