/* * 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 join filter * * Join multiple audio inputs as different channels in * a single output */ #include "libavutil/avassert.h"#include "libavutil/channel_layout.h"#include "libavutil/common.h"#include "libavutil/opt.h" #include "audio.h"#include "avfilter.h"#include "formats.h"#include "internal.h" typedef struct ChannelMap {    int input;                ///< input stream index    int       in_channel_idx; ///< index of in_channel in the input stream data    uint64_t  in_channel;     ///< layout describing the input channel    uint64_t out_channel;     ///< layout describing the output channel} ChannelMap; typedef struct JoinContext {    const AVClass *class;     int inputs;    char *map;    char    *channel_layout_str;    uint64_t channel_layout;     int      nb_channels;    ChannelMap *channels;     /**     * Temporary storage for input frames, until we get one on each input.     */    AVFrame **input_frames;     /**     *  Temporary storage for buffer references, for assembling the output frame.     */    AVBufferRef **buffers;} JoinContext; #define OFFSET(x) offsetof(JoinContext, x)#define A AV_OPT_FLAG_AUDIO_PARAM#define F AV_OPT_FLAG_FILTERING_PARAMstatic const AVOption join_options[] = {    { "inputs",         "Number of input streams.", OFFSET(inputs),             AV_OPT_TYPE_INT,    { .i64 = 2 }, 1, INT_MAX,       A|F },    { "channel_layout", "Channel layout of the "                        "output stream.",           OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, A|F },    { "map",            "A comma-separated list of channels maps in the format "                        "'input_stream.input_channel-output_channel.",                                                    OFFSET(map),                AV_OPT_TYPE_STRING,                 .flags = A|F },    { NULL }}; AVFILTER_DEFINE_CLASS(join); static int try_push_frame(AVFilterContext *ctx); static int filter_frame(AVFilterLink *link, AVFrame *frame){    AVFilterContext *ctx = link->dst;    JoinContext       *s = ctx->priv;    int i, j;     for (i = 0; i < ctx->nb_inputs; i++)        if (link == ctx->inputs[i])            break;    av_assert0(i < ctx->nb_inputs);    av_assert0(!s->input_frames[i]);    s->input_frames[i] = frame;     /* request the same number of samples on all inputs */    /* FIXME that means a frame arriving asynchronously on a different input       will not have the requested number of samples */    if (i == 0) {        int nb_samples = s->input_frames[0]->nb_samples;         for (j = 1; !i && j < ctx->nb_inputs; j++)            ctx->inputs[j]->request_samples = nb_samples;    }     return try_push_frame(ctx);} static int parse_maps(AVFilterContext *ctx){    JoinContext *s = ctx->priv;    char separator = '|';    char *cur      = s->map; #if FF_API_OLD_FILTER_OPTS    if (cur && strchr(cur, ',')) {        av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "               "separate the mappings.\n");        separator = ',';    }#endif     while (cur && *cur) {        char *sep, *next, *p;        uint64_t in_channel = 0, out_channel = 0;        int input_idx, out_ch_idx, in_ch_idx;         next = strchr(cur, separator);        if (next)            *next++ = 0;         /* split the map into input and output parts */        if (!(sep = strchr(cur, '-'))) {            av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "                   "map '%s'\n", cur);            return AVERROR(EINVAL);        }        *sep++ = 0; #define PARSE_CHANNEL(str, var, inout)                                         \        if (!(var = av_get_channel_layout(str))) {                             \            av_log(ctx, AV_LOG_ERROR, "Invalid " inout " channel: %s.\n", str);\            return AVERROR(EINVAL);                                            \        }                                                                      \        if (av_get_channel_layout_nb_channels(var) != 1) {                     \            av_log(ctx, AV_LOG_ERROR, "Channel map describes more than one "   \                   inout " channel.\n");                                       \            return AVERROR(EINVAL);                                            \        }         /* parse output channel */        PARSE_CHANNEL(sep, out_channel, "output");        if (!(out_channel & s->channel_layout)) {            av_log(ctx, AV_LOG_ERROR, "Output channel '%s' is not present in "                   "requested channel layout.\n", sep);            return AVERROR(EINVAL);        }         out_ch_idx = av_get_channel_layout_channel_index(s->channel_layout,                                                         out_channel);        if (s->channels[out_ch_idx].input >= 0) {            av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "                   "'%s'.\n", sep);            return AVERROR(EINVAL);        }         /* parse input channel */        input_idx = strtol(cur, &cur, 0);        if (input_idx < 0 || input_idx >= s->inputs) {            av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",                   input_idx);            return AVERROR(EINVAL);        }         if (*cur)            cur++;         in_ch_idx = strtol(cur, &p, 0);        if (p == cur) {            /* channel specifier is not a number,             * try to parse as channel name */            PARSE_CHANNEL(cur, in_channel, "input");        }         s->channels[out_ch_idx].input      = input_idx;        if (in_channel)            s->channels[out_ch_idx].in_channel = in_channel;        else            s->channels[out_ch_idx].in_channel_idx = in_ch_idx;         cur = next;    }    return 0;} static av_cold int join_init(AVFilterContext *ctx){    JoinContext *s = ctx->priv;    int ret, i;     if (!(s->channel_layout = av_get_channel_layout(s->channel_layout_str))) {        av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",               s->channel_layout_str);        return AVERROR(EINVAL);    }     s->nb_channels  = av_get_channel_layout_nb_channels(s->channel_layout);    s->channels     = av_mallocz_array(s->nb_channels, sizeof(*s->channels));    s->buffers      = av_mallocz_array(s->nb_channels, sizeof(*s->buffers));    s->input_frames = av_mallocz_array(s->inputs, sizeof(*s->input_frames));    if (!s->channels || !s->buffers|| !s->input_frames)        return AVERROR(ENOMEM);     for (i = 0; i < s->nb_channels; i++) {        s->channels[i].out_channel = av_channel_layout_extract_channel(s->channel_layout, i);        s->channels[i].input       = -1;    }     if ((ret = parse_maps(ctx)) < 0)        return ret;     for (i = 0; i < s->inputs; i++) {        char name[32];        AVFilterPad pad = { 0 };         snprintf(name, sizeof(name), "input%d", i);        pad.type           = AVMEDIA_TYPE_AUDIO;        pad.name           = av_strdup(name);        if (!pad.name)            return AVERROR(ENOMEM);        pad.filter_frame   = filter_frame;         pad.needs_fifo = 1;         ff_insert_inpad(ctx, i, &pad);    }     return 0;} static av_cold void join_uninit(AVFilterContext *ctx){    JoinContext *s = ctx->priv;    int i;     for (i = 0; i < ctx->nb_inputs; i++) {        av_freep(&ctx->input_pads[i].name);        av_frame_free(&s->input_frames[i]);    }     av_freep(&s->channels);    av_freep(&s->buffers);    av_freep(&s->input_frames);} static int join_query_formats(AVFilterContext *ctx){    JoinContext *s = ctx->priv;    AVFilterChannelLayouts *layouts = NULL;    int i, ret;     if ((ret = ff_add_channel_layout(&layouts, s->channel_layout)) < 0 ||        (ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts)) < 0)        return ret;     for (i = 0; i < ctx->nb_inputs; i++) {        layouts = ff_all_channel_layouts();        if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts)) < 0)            return ret;    }     if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||        (ret = ff_set_common_samplerates(ctx, ff_all_samplerates())) < 0)        return ret;     return 0;} static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch,                               uint64_t *inputs){    int i;     for (i = 0; i < ctx->nb_inputs; i++) {        AVFilterLink *link = ctx->inputs[i];         if (ch->out_channel & link->channel_layout &&            !(ch->out_channel & inputs[i])) {            ch->input      = i;            ch->in_channel = ch->out_channel;            inputs[i]     |= ch->out_channel;            return;        }    }} static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch,                          uint64_t *inputs){    int i;     for (i = 0; i < ctx->nb_inputs; i++) {        AVFilterLink *link = ctx->inputs[i];         if ((inputs[i] & link->channel_layout) != link->channel_layout) {            uint64_t unused = link->channel_layout & ~inputs[i];             ch->input      = i;            ch->in_channel = av_channel_layout_extract_channel(unused, 0);            inputs[i]     |= ch->in_channel;            return;        }    }} static int join_config_output(AVFilterLink *outlink){    AVFilterContext *ctx = outlink->src;    JoinContext       *s = ctx->priv;    uint64_t *inputs;   // nth element tracks which channels are used from nth input    int i, ret = 0;     /* initialize inputs to user-specified mappings */    if (!(inputs = av_mallocz_array(ctx->nb_inputs, sizeof(*inputs))))        return AVERROR(ENOMEM);    for (i = 0; i < s->nb_channels; i++) {        ChannelMap *ch = &s->channels[i];        AVFilterLink *inlink;         if (ch->input < 0)            continue;         inlink = ctx->inputs[ch->input];         if (!ch->in_channel)            ch->in_channel = av_channel_layout_extract_channel(inlink->channel_layout,                                                               ch->in_channel_idx);         if (!(ch->in_channel & inlink->channel_layout)) {            av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "                   "input stream #%d.\n", av_get_channel_name(ch->in_channel),                   ch->input);            ret = AVERROR(EINVAL);            goto fail;        }         inputs[ch->input] |= ch->in_channel;    }     /* guess channel maps when not explicitly defined */    /* first try unused matching channels */    for (i = 0; i < s->nb_channels; i++) {        ChannelMap *ch = &s->channels[i];         if (ch->input < 0)            guess_map_matching(ctx, ch, inputs);    }     /* if the above failed, try to find _any_ unused input channel */    for (i = 0; i < s->nb_channels; i++) {        ChannelMap *ch = &s->channels[i];         if (ch->input < 0)            guess_map_any(ctx, ch, inputs);         if (ch->input < 0) {            av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "                   "output channel '%s'.\n",                   av_get_channel_name(ch->out_channel));            goto fail;        }         ch->in_channel_idx = av_get_channel_layout_channel_index(ctx->inputs[ch->input]->channel_layout,                                                                 ch->in_channel);    }     /* print mappings */    av_log(ctx, AV_LOG_VERBOSE, "mappings: ");    for (i = 0; i < s->nb_channels; i++) {        ChannelMap *ch = &s->channels[i];        av_log(ctx, AV_LOG_VERBOSE, "%d.%s => %s ", ch->input,               av_get_channel_name(ch->in_channel),               av_get_channel_name(ch->out_channel));    }    av_log(ctx, AV_LOG_VERBOSE, "\n");     for (i = 0; i < ctx->nb_inputs; i++) {        if (!inputs[i])            av_log(ctx, AV_LOG_WARNING, "No channels are used from input "                   "stream %d.\n", i);    } fail:    av_freep(&inputs);    return ret;} static int join_request_frame(AVFilterLink *outlink){    AVFilterContext *ctx = outlink->src;    JoinContext *s       = ctx->priv;    int i;     /* get a frame on each input */    for (i = 0; i < ctx->nb_inputs; i++) {        AVFilterLink *inlink = ctx->inputs[i];        if (!s->input_frames[i])            return ff_request_frame(inlink);    }    return 0;} static int try_push_frame(AVFilterContext *ctx){    AVFilterLink *outlink = ctx->outputs[0];    JoinContext *s       = ctx->priv;    AVFrame *frame;    int linesize   = INT_MAX;    int nb_samples = INT_MAX;    int nb_buffers = 0;    int i, j, ret;     for (i = 0; i < ctx->nb_inputs; i++) {        if (!s->input_frames[i])            return 0;        nb_samples = FFMIN(nb_samples, s->input_frames[i]->nb_samples);    }     /* setup the output frame */    frame = av_frame_alloc();    if (!frame)        return AVERROR(ENOMEM);    if (s->nb_channels > FF_ARRAY_ELEMS(frame->data)) {        frame->extended_data = av_mallocz_array(s->nb_channels,                                          sizeof(*frame->extended_data));        if (!frame->extended_data) {            ret = AVERROR(ENOMEM);            goto fail;        }    }     /* copy the data pointers */    for (i = 0; i < s->nb_channels; i++) {        ChannelMap *ch = &s->channels[i];        AVFrame *cur   = s->input_frames[ch->input];        AVBufferRef *buf;         frame->extended_data[i] = cur->extended_data[ch->in_channel_idx];        linesize = FFMIN(linesize, cur->linesize[0]);         /* add the buffer where this plan is stored to the list if it's         * not already there */        buf = av_frame_get_plane_buffer(cur, ch->in_channel_idx);        if (!buf) {            ret = AVERROR(EINVAL);            goto fail;        }        for (j = 0; j < nb_buffers; j++)            if (s->buffers[j]->buffer == buf->buffer)                break;        if (j == i)            s->buffers[nb_buffers++] = buf;    }     /* create references to the buffers we copied to output */    if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {        frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);        frame->extended_buf = av_mallocz_array(frame->nb_extended_buf,                                               sizeof(*frame->extended_buf));        if (!frame->extended_buf) {            frame->nb_extended_buf = 0;            ret = AVERROR(ENOMEM);            goto fail;        }    }    for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {        frame->buf[i] = av_buffer_ref(s->buffers[i]);        if (!frame->buf[i]) {            ret = AVERROR(ENOMEM);            goto fail;        }    }    for (i = 0; i < frame->nb_extended_buf; i++) {        frame->extended_buf[i] = av_buffer_ref(s->buffers[i +                                               FF_ARRAY_ELEMS(frame->buf)]);        if (!frame->extended_buf[i]) {            ret = AVERROR(ENOMEM);            goto fail;        }    }     frame->nb_samples     = nb_samples;    frame->channel_layout = outlink->channel_layout;    av_frame_set_channels(frame, outlink->channels);    frame->sample_rate    = outlink->sample_rate;    frame->format         = outlink->format;    frame->pts            = s->input_frames[0]->pts;    frame->linesize[0]    = linesize;    if (frame->data != frame->extended_data) {        memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *

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