[FFmpeg-devel] [PATCH 2/4] doc/examples: add directory listing example

Michael Niedermayer michaelni at gmx.at
Fri Mar 27 19:09:52 CET 2015


On Thu, Mar 26, 2015 at 01:25:18AM +0100, Mariusz Szczepańczyk wrote:
> From: Lukasz Marek <lukasz.m.luki2 at gmail.com>
> 
> ---
>  .gitignore                   |   1 +
>  configure                    |   2 +
>  doc/Makefile                 |   1 +
>  doc/examples/Makefile        |   3 +-
>  doc/examples/avio_list_dir.c | 105 +++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 111 insertions(+), 1 deletion(-)
>  create mode 100644 doc/examples/avio_list_dir.c
> 
> diff --git a/.gitignore b/.gitignore
> index d2088e5..71d4d64 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -36,6 +36,7 @@
>  /doc/avoptions_codec.texi
>  /doc/avoptions_format.texi
>  /doc/doxy/html/
> +/doc/examples/avio_list_dir
>  /doc/examples/avio_reading
>  /doc/examples/decoding_encoding
>  /doc/examples/demuxing_decoding
> diff --git a/configure b/configure
> index a96bfb7..cd84d2b 100755
> --- a/configure
> +++ b/configure
> @@ -1321,6 +1321,7 @@ COMPONENT_LIST="
>  
>  EXAMPLE_LIST="
>      avio_reading_example
> +    avio_list_dir_example
>      decoding_encoding_example
>      demuxing_decoding_example
>      extract_mvs_example
> @@ -2653,6 +2654,7 @@ zoompan_filter_deps="swscale"
>  
>  # examples
>  avio_reading="avformat avcodec avutil"
> +avio_list_dir="avformat avutil"
>  avcodec_example_deps="avcodec avutil"
>  decoding_encoding_example_deps="avcodec avformat avutil"
>  demuxing_decoding_example_deps="avcodec avformat avutil"
> diff --git a/doc/Makefile b/doc/Makefile
> index 697142f..4573531 100644
> --- a/doc/Makefile
> +++ b/doc/Makefile
> @@ -36,6 +36,7 @@ DOCS-$(CONFIG_MANPAGES)  += $(MANPAGES)
>  DOCS-$(CONFIG_TXTPAGES)  += $(TXTPAGES)
>  DOCS = $(DOCS-yes)
>  
> +DOC_EXAMPLES-$(CONFIG_AVIO_LIST_DIR_EXAMPLE)     += avio_list_dir
>  DOC_EXAMPLES-$(CONFIG_AVIO_READING_EXAMPLE)      += avio_reading
>  DOC_EXAMPLES-$(CONFIG_AVCODEC_EXAMPLE)           += avcodec
>  DOC_EXAMPLES-$(CONFIG_DECODING_ENCODING_EXAMPLE) += decoding_encoding
> diff --git a/doc/examples/Makefile b/doc/examples/Makefile
> index 9f03f04..9699f11 100644
> --- a/doc/examples/Makefile
> +++ b/doc/examples/Makefile
> @@ -11,7 +11,8 @@ CFLAGS += -Wall -g
>  CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
>  LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS)
>  
> -EXAMPLES=       avio_reading                       \
> +EXAMPLES=       avio_list_dir                      \
> +                avio_reading                       \
>                  decoding_encoding                  \
>                  demuxing_decoding                  \
>                  extract_mvs                        \
> diff --git a/doc/examples/avio_list_dir.c b/doc/examples/avio_list_dir.c
> new file mode 100644
> index 0000000..d0e8598
> --- /dev/null
> +++ b/doc/examples/avio_list_dir.c
> @@ -0,0 +1,105 @@
> +/*
> + * Copyright (c) 2014 Lukasz Marek
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#include <libavcodec/avcodec.h>
> +#include <libavformat/avformat.h>
> +#include <libavformat/avio.h>
> +
> +static const char *type_string(int type)
> +{
> +    switch (type) {
> +    case AVIO_ENTRY_DIRECTORY:
> +        return "<DIR>";
> +    case AVIO_ENTRY_FILE:
> +        return "<FILE>";
> +    case AVIO_ENTRY_BLOCK_DEVICE:
> +        return "<BLOCK DEVICE>";
> +    case AVIO_ENTRY_CHARACTER_DEVICE:
> +        return "<CHARACTER DEVICE>";
> +    case AVIO_ENTRY_NAMED_PIPE:
> +        return "<PIPE>";
> +    case AVIO_ENTRY_SYMBOLIC_LINK:
> +        return "<LINK>";
> +    case AVIO_ENTRY_SOCKET:
> +        return "<SOCKET>";
> +    case AVIO_ENTRY_UNKNOWN:
> +    default:
> +        break;
> +    }
> +    return "<UNKNOWN>";
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +    const char *input_dir = NULL;
> +    AVIODirEntry *entry = NULL;
> +    AVIODirContext *ctx = NULL;
> +    int ret;
> +    char filemode[4];
> +
> +    av_log_set_level(AV_LOG_DEBUG);
> +
> +    if (argc != 2) {
> +        fprintf(stderr, "usage: %s input_dir\n"
> +                "API example program to show how to list files in directory "
> +                "accessed through AVIOContext.\n", argv[0]);
> +        return 1;
> +    }
> +    input_dir = argv[1];
> +
> +    /* register codecs and formats and other lavf/lavc components*/
> +    av_register_all();
> +
> +    if ((ret = avio_open_dir(&ctx, input_dir, NULL)) < 0) {
> +        av_log(NULL, AV_LOG_ERROR, "Cannot open directory: %s.\n", av_err2str(ret));
> +        return 1;
> +    }
> +

> +    for (;;) {
> +        if ((ret = avio_read_dir(ctx, &entry)) < 0) {
> +            av_log(NULL, AV_LOG_ERROR, "Cannot list directory: %s.\n", av_err2str(ret));
> +            return 1;
> +        }
> +        if (!entry)
> +            break;
> +        if (entry->filemode == -1) {
> +            snprintf(filemode, 4, "???");
> +        } else {
> +            snprintf(filemode, 4, "%3"PRIo64, entry->filemode);
> +        }
> +        av_log(NULL, AV_LOG_INFO, "%-9s %10"PRId64" %30s %"PRId64"(%"PRId64") %s %"PRId64" %"PRId64" %"PRId64"\n",
> +               type_string(entry->type),
> +               entry->size,
> +               entry->name,
> +               entry->user_id,
> +               entry->group_id,
> +               filemode,
> +               entry->modification_timestamp,
> +               entry->access_timestamp,
> +               entry->status_change_timestamp);

this seems missing a header line in the printout that lists what
each column represents

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The bravest are surely those who have the clearest vision
of what is before them, glory and danger alike, and yet
notwithstanding go out to meet it. -- Thucydides
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