avfilter/af_silenceremove: prefer outlink instead of inlink
[ffmpeg.git] / libavfilter / af_channelsplit.c
index 32b85d8..821bb73 100644 (file)
@@ -1,18 +1,18 @@
 /*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * 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.
  *
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -23,7 +23,9 @@
  * Split an audio stream into per-channel streams.
  */
 
-#include "libavutil/audioconvert.h"
+#include "libavutil/attributes.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/internal.h"
 #include "libavutil/opt.h"
 
 #include "audio.h"
@@ -36,34 +38,29 @@ typedef struct ChannelSplitContext {
 
     uint64_t channel_layout;
     char    *channel_layout_str;
+    char    *channels_str;
+
+    int      map[64];
 } ChannelSplitContext;
 
 #define OFFSET(x) offsetof(ChannelSplitContext, x)
 #define A AV_OPT_FLAG_AUDIO_PARAM
-static const AVOption options[] = {
-    { "channel_layout", "Input channel layout.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, { .str = "stereo" }, .flags = A },
-    { NULL },
+#define F AV_OPT_FLAG_FILTERING_PARAM
+static const AVOption channelsplit_options[] = {
+    { "channel_layout", "Input channel layout.", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, { .str = "stereo" }, .flags = A|F },
+    { "channels",        "Channels to extract.", OFFSET(channels_str),       AV_OPT_TYPE_STRING, { .str = "all" },    .flags = A|F },
+    { NULL }
 };
 
-static const AVClass channelsplit_class = {
-    .class_name = "channelsplit filter",
-    .item_name  = av_default_item_name,
-    .option     = options,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
+AVFILTER_DEFINE_CLASS(channelsplit);
 
-static int init(AVFilterContext *ctx, const char *arg)
+static av_cold int init(AVFilterContext *ctx)
 {
     ChannelSplitContext *s = ctx->priv;
+    uint64_t channel_layout;
     int nb_channels;
-    int ret = 0, i;
+    int all = 0, ret = 0, i;
 
-    s->class = &channelsplit_class;
-    av_opt_set_defaults(s);
-    if ((ret = av_set_options_string(s, arg, "=", ":")) < 0) {
-        av_log(ctx, AV_LOG_ERROR, "Error parsing options string '%s'.\n", arg);
-        return ret;
-    }
     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);
@@ -71,19 +68,41 @@ static int init(AVFilterContext *ctx, const char *arg)
         goto fail;
     }
 
-    nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);
+
+    if (!strcmp(s->channels_str, "all")) {
+        nb_channels = av_get_channel_layout_nb_channels(s->channel_layout);
+        channel_layout = s->channel_layout;
+        all = 1;
+    } else {
+        if ((ret = av_get_extended_channel_layout(s->channels_str, &channel_layout, &nb_channels)) < 0)
+            return ret;
+    }
+
     for (i = 0; i < nb_channels; i++) {
-        uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, i);
+        uint64_t channel = av_channel_layout_extract_channel(channel_layout, i);
         AVFilterPad pad  = { 0 };
 
         pad.type = AVMEDIA_TYPE_AUDIO;
         pad.name = av_get_channel_name(channel);
 
-        ff_insert_outpad(ctx, i, &pad);
+        if (all) {
+            s->map[i] = i;
+        } else {
+            if ((ret = av_get_channel_layout_channel_index(s->channel_layout, channel)) < 0) {
+                av_log(ctx, AV_LOG_ERROR, "Channel name '%s' not present in channel layout '%s'.\n",
+                       av_get_channel_name(channel), s->channel_layout_str);
+                return ret;
+            }
+
+            s->map[i] = ret;
+        }
+
+        if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {
+            return ret;
+        }
     }
 
 fail:
-    av_opt_free(s);
     return ret;
 }
 
@@ -91,61 +110,72 @@ static int query_formats(AVFilterContext *ctx)
 {
     ChannelSplitContext *s = ctx->priv;
     AVFilterChannelLayouts *in_layouts = NULL;
-    int i;
+    int i, ret;
 
-    ff_set_common_formats    (ctx, ff_planar_sample_fmts());
-    ff_set_common_samplerates(ctx, ff_all_samplerates());
+    if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 ||
+        (ret = ff_set_common_samplerates(ctx, ff_all_samplerates())) < 0)
+        return ret;
 
-    ff_add_channel_layout(&in_layouts, s->channel_layout);
-    ff_channel_layouts_ref(in_layouts, &ctx->inputs[0]->out_channel_layouts);
+    if ((ret = ff_add_channel_layout(&in_layouts, s->channel_layout)) < 0 ||
+        (ret = ff_channel_layouts_ref(in_layouts, &ctx->inputs[0]->out_channel_layouts)) < 0)
+        return ret;
 
     for (i = 0; i < ctx->nb_outputs; i++) {
         AVFilterChannelLayouts *out_layouts = NULL;
-        uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, i);
+        uint64_t channel = av_channel_layout_extract_channel(s->channel_layout, s->map[i]);
 
-        ff_add_channel_layout(&out_layouts, channel);
-        ff_channel_layouts_ref(out_layouts, &ctx->outputs[i]->in_channel_layouts);
+        if ((ret = ff_add_channel_layout(&out_layouts, channel)) < 0 ||
+            (ret = ff_channel_layouts_ref(out_layouts, &ctx->outputs[i]->in_channel_layouts)) < 0)
+            return ret;
     }
 
     return 0;
 }
 
-static int filter_samples(AVFilterLink *inlink, AVFilterBufferRef *buf)
+static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
 {
     AVFilterContext *ctx = inlink->dst;
+    ChannelSplitContext *s = ctx->priv;
     int i, ret = 0;
 
     for (i = 0; i < ctx->nb_outputs; i++) {
-        AVFilterBufferRef *buf_out = avfilter_ref_buffer(buf, ~AV_PERM_WRITE);
+        AVFrame *buf_out = av_frame_clone(buf);
 
         if (!buf_out) {
             ret = AVERROR(ENOMEM);
             break;
         }
 
-        buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[i];
-        buf_out->audio->channel_layout =
-            av_channel_layout_extract_channel(buf->audio->channel_layout, i);
+        buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]];
+        buf_out->channel_layout =
+            av_channel_layout_extract_channel(buf->channel_layout, s->map[i]);
+        buf_out->channels = 1;
 
-        ret = ff_filter_samples(ctx->outputs[i], buf_out);
+        ret = ff_filter_frame(ctx->outputs[i], buf_out);
         if (ret < 0)
             break;
     }
-    avfilter_unref_buffer(buf);
+    av_frame_free(&buf);
     return ret;
 }
 
-AVFilter avfilter_af_channelsplit = {
+static const AVFilterPad avfilter_af_channelsplit_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+AVFilter ff_af_channelsplit = {
     .name           = "channelsplit",
-    .description    = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams"),
+    .description    = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams."),
     .priv_size      = sizeof(ChannelSplitContext),
-
+    .priv_class     = &channelsplit_class,
     .init           = init,
     .query_formats  = query_formats,
-
-    .inputs  = (const AVFilterPad[]){{ .name           = "default",
-                                       .type           = AVMEDIA_TYPE_AUDIO,
-                                       .filter_samples = filter_samples, },
-                                     { NULL }},
-    .outputs = (const AVFilterPad[]){{ NULL }},
+    .inputs         = avfilter_af_channelsplit_inputs,
+    .outputs        = NULL,
+    .flags          = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 };