LCOV - code coverage report
Current view: top level - libavfilter - af_channelsplit.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 46 62 74.2 %
Date: 2018-05-20 11:54:08 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of FFmpeg.
       3             :  *
       4             :  * FFmpeg is free software; you can redistribute it and/or
       5             :  * modify it under the terms of the GNU Lesser General Public
       6             :  * License as published by the Free Software Foundation; either
       7             :  * version 2.1 of the License, or (at your option) any later version.
       8             :  *
       9             :  * FFmpeg is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             :  * Lesser General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU Lesser General Public
      15             :  * License along with FFmpeg; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : /**
      20             :  * @file
      21             :  * Channel split filter
      22             :  *
      23             :  * Split an audio stream into per-channel streams.
      24             :  */
      25             : 
      26             : #include "libavutil/attributes.h"
      27             : #include "libavutil/channel_layout.h"
      28             : #include "libavutil/internal.h"
      29             : #include "libavutil/opt.h"
      30             : 
      31             : #include "audio.h"
      32             : #include "avfilter.h"
      33             : #include "formats.h"
      34             : #include "internal.h"
      35             : 
      36             : typedef struct ChannelSplitContext {
      37             :     const AVClass *class;
      38             : 
      39             :     uint64_t channel_layout;
      40             :     char    *channel_layout_str;
      41             :     char    *channels_str;
      42             : 
      43             :     int      map[64];
      44             : } ChannelSplitContext;
      45             : 
      46             : #define OFFSET(x) offsetof(ChannelSplitContext, x)
      47             : #define A AV_OPT_FLAG_AUDIO_PARAM
      48             : #define F AV_OPT_FLAG_FILTERING_PARAM
      49             : static const AVOption channelsplit_options[] = {
      50             :     { "channel_layout", "Input channel layout.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, { .str = "stereo" }, .flags = A|F },
      51             :     { "channels",        "Channels to extract.", OFFSET(channels_str),       AV_OPT_TYPE_STRING, { .str = "all" },    .flags = A|F },
      52             :     { NULL }
      53             : };
      54             : 
      55             : AVFILTER_DEFINE_CLASS(channelsplit);
      56             : 
      57           2 : static av_cold int init(AVFilterContext *ctx)
      58             : {
      59           2 :     ChannelSplitContext *s = ctx->priv;
      60             :     uint64_t channel_layout;
      61             :     int nb_channels;
      62           2 :     int all = 0, ret = 0, i;
      63             : 
      64           2 :     if (!(s->channel_layout = av_get_channel_layout(s->channel_layout_str))) {
      65           0 :         av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",
      66             :                s->channel_layout_str);
      67           0 :         ret = AVERROR(EINVAL);
      68           0 :         goto fail;
      69             :     }
      70             : 
      71             : 
      72           2 :     if (!strcmp(s->channels_str, "all")) {
      73           2 :         nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);
      74           2 :         channel_layout = s->channel_layout;
      75           2 :         all = 1;
      76             :     } else {
      77           0 :         if ((ret = av_get_extended_channel_layout(s->channels_str, &channel_layout, &nb_channels)) < 0)
      78           0 :             return ret;
      79             :     }
      80             : 
      81          12 :     for (i = 0; i < nb_channels; i++) {
      82           4 :         uint64_t channel = av_channel_layout_extract_channel(channel_layout, i);
      83           4 :         AVFilterPad pad  = { 0 };
      84             : 
      85           4 :         pad.type = AVMEDIA_TYPE_AUDIO;
      86           4 :         pad.name = av_get_channel_name(channel);
      87             : 
      88           4 :         if (all) {
      89           4 :             s->map[i] = i;
      90             :         } else {
      91           0 :             if ((ret = av_get_channel_layout_channel_index(s->channel_layout, channel)) < 0) {
      92           0 :                 av_log(ctx, AV_LOG_ERROR, "Channel name '%s' not present in channel layout '%s'.\n",
      93             :                        av_get_channel_name(channel), s->channel_layout_str);
      94           0 :                 return ret;
      95             :             }
      96             : 
      97           0 :             s->map[i] = ret;
      98             :         }
      99             : 
     100           4 :         if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {
     101           0 :             return ret;
     102             :         }
     103             :     }
     104             : 
     105           2 : fail:
     106           2 :     return ret;
     107             : }
     108             : 
     109           1 : static int query_formats(AVFilterContext *ctx)
     110             : {
     111           1 :     ChannelSplitContext *s = ctx->priv;
     112           1 :     AVFilterChannelLayouts *in_layouts = NULL;
     113             :     int i, ret;
     114             : 
     115           2 :     if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
     116           1 :         (ret = ff_set_common_samplerates(ctx, ff_all_samplerates())) < 0)
     117           0 :         return ret;
     118             : 
     119           2 :     if ((ret = ff_add_channel_layout(&in_layouts, s->channel_layout)) < 0 ||
     120           1 :         (ret = ff_channel_layouts_ref(in_layouts, &ctx->inputs[0]->out_channel_layouts)) < 0)
     121           0 :         return ret;
     122             : 
     123           3 :     for (i = 0; i < ctx->nb_outputs; i++) {
     124           2 :         AVFilterChannelLayouts *out_layouts = NULL;
     125           2 :         uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, s->map[i]);
     126             : 
     127           4 :         if ((ret = ff_add_channel_layout(&out_layouts, channel)) < 0 ||
     128           2 :             (ret = ff_channel_layouts_ref(out_layouts, &ctx->outputs[i]->in_channel_layouts)) < 0)
     129           0 :             return ret;
     130             :     }
     131             : 
     132           1 :     return 0;
     133             : }
     134             : 
     135         259 : static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
     136             : {
     137         259 :     AVFilterContext *ctx = inlink->dst;
     138         259 :     ChannelSplitContext *s = ctx->priv;
     139         259 :     int i, ret = 0;
     140             : 
     141         777 :     for (i = 0; i < ctx->nb_outputs; i++) {
     142         518 :         AVFrame *buf_out = av_frame_clone(buf);
     143             : 
     144         518 :         if (!buf_out) {
     145           0 :             ret = AVERROR(ENOMEM);
     146           0 :             break;
     147             :         }
     148             : 
     149         518 :         buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]];
     150         518 :         buf_out->channel_layout =
     151         518 :             av_channel_layout_extract_channel(buf->channel_layout, s->map[i]);
     152         518 :         buf_out->channels = 1;
     153             : 
     154         518 :         ret = ff_filter_frame(ctx->outputs[i], buf_out);
     155         518 :         if (ret < 0)
     156           0 :             break;
     157             :     }
     158         259 :     av_frame_free(&buf);
     159         259 :     return ret;
     160             : }
     161             : 
     162             : static const AVFilterPad avfilter_af_channelsplit_inputs[] = {
     163             :     {
     164             :         .name         = "default",
     165             :         .type         = AVMEDIA_TYPE_AUDIO,
     166             :         .filter_frame = filter_frame,
     167             :     },
     168             :     { NULL }
     169             : };
     170             : 
     171             : AVFilter ff_af_channelsplit = {
     172             :     .name           = "channelsplit",
     173             :     .description    = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams."),
     174             :     .priv_size      = sizeof(ChannelSplitContext),
     175             :     .priv_class     = &channelsplit_class,
     176             :     .init           = init,
     177             :     .query_formats  = query_formats,
     178             :     .inputs         = avfilter_af_channelsplit_inputs,
     179             :     .outputs        = NULL,
     180             :     .flags          = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
     181             : };

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