[FFmpeg-devel] [PATCH 2/4] lavfi: add asink_abuffer - audio sink buffer filter
Mina Nagy Zaki
mnzaki at gmail.com
Wed Jul 27 00:05:18 CEST 2011
---
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/asink_abuffer.c | 91 +++++++++++++++++++++++++++++++++++++++++++
libavfilter/asink_abuffer.h | 44 +++++++++++++++++++++
4 files changed, 137 insertions(+), 0 deletions(-)
create mode 100644 libavfilter/asink_abuffer.c
create mode 100644 libavfilter/asink_abuffer.h
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 686fd30..83b906d 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -23,6 +23,7 @@ OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o
OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
+OBJS-$(CONFIG_ABUFFERSINK_FILTER) += asink_abuffer.o
OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 49be7b7..b812ff7 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -40,6 +40,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (ABUFFER, abuffer, asrc);
REGISTER_FILTER (ANULLSRC, anullsrc, asrc);
+ REGISTER_FILTER (ABUFFER, abuffersink, asink);
REGISTER_FILTER (ANULLSINK, anullsink, asink);
REGISTER_FILTER (BLACKFRAME, blackframe, vf);
diff --git a/libavfilter/asink_abuffer.c b/libavfilter/asink_abuffer.c
new file mode 100644
index 0000000..96a32c1
--- /dev/null
+++ b/libavfilter/asink_abuffer.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2011 Stefano Sabatini
+ * Copyright (c) 2011 Mina Nagy Zaki
+ *
+ * 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 buffer sink
+ */
+
+#include "avfilter.h"
+#include "asink_abuffer.h"
+
+static void filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
+{
+}
+
+static int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ if (!opaque)
+ return AVERROR(EINVAL);
+ memcpy(ctx->priv, opaque, sizeof(ABufferSinkContext));
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ ABufferSinkContext *abuffersink = ctx->priv;
+ AVFilterFormats *formats;
+
+ formats = NULL;
+ avfilter_add_format(&formats, abuffersink->sample_fmt);
+ avfilter_set_common_sample_formats(ctx, formats);
+
+ formats = NULL;
+ avfilter_add_format(&formats, abuffersink->channel_layout);
+ avfilter_set_common_channel_layouts(ctx, formats);
+
+ formats = NULL;
+ avfilter_add_format(&formats, AVFILTER_PACKED); //FIXME
+ avfilter_set_common_packing_formats(ctx, formats);
+
+ return 0;
+}
+
+int av_asink_abuffer_get_audio_buffer_ref(AVFilterContext *abuffer_asink,
+ AVFilterBufferRef **samplesref)
+{
+ int ret;
+
+ if ((ret = avfilter_request_frame(abuffer_asink->inputs[0])))
+ return ret;
+ if (!abuffer_asink->inputs[0]->cur_buf)
+ return AVERROR(EINVAL);
+ *samplesref = abuffer_asink->inputs[0]->cur_buf;
+ abuffer_asink->inputs[0]->cur_buf = NULL;
+
+ return 0;
+}
+
+AVFilter avfilter_asink_abuffersink = {
+ .name = "abuffersink",
+ .init = init,
+ .priv_size = sizeof(ABufferSinkContext),
+ .query_formats = query_formats,
+
+ .inputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_samples = filter_samples,
+ .min_perms = AV_PERM_READ, },
+ { .name = NULL }},
+ .outputs = (AVFilterPad[]) {{ .name = NULL }},
+};
+
diff --git a/libavfilter/asink_abuffer.h b/libavfilter/asink_abuffer.h
new file mode 100644
index 0000000..9105840
--- /dev/null
+++ b/libavfilter/asink_abuffer.h
@@ -0,0 +1,44 @@
+/*
+ * 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
+ */
+
+#ifndef AVFILTER_ASINK_BUFFER_H
+#define AVFILTER_ASINK_BUFFER_H
+
+/**
+ * @file
+ * audio buffer sink API
+ */
+
+#include "avfilter.h"
+
+typedef struct {
+ enum AVSampleFormat sample_fmt;
+ int64_t channel_layout;
+} ABufferSinkContext;
+
+
+/**
+ * Get a video buffer data from buffer_sink and put it in picref.
+ *
+ * @param abuffer_sink pointer to a buffer sink context
+ * @return >= 0 in case of success, a negative AVERROR code in case of failure
+ */
+int av_asink_abuffer_get_audio_buffer_ref(AVFilterContext *abuffer_asink,
+ AVFilterBufferRef **samplesref);
+
+#endif /* AVFILTER_VSINK_BUFFER_H */
--
1.7.4.4
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