FFmpeg读取文件列表

1. $ sudo vim dir.c

include <stdio.h>
#include <inttypes.h>
#include <libavutil/log.h>
#include <libavutil/error.h>
#include <libavformat/avio.h>

//文件类型
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_SERVER:
        return "<SERVER>";
    case AVIO_ENTRY_SHARE:
        return "<SHARE>";
    case AVIO_ENTRY_WORKGROUP:
        return "<WORKGROUP>";
}

int main()
{
    AVIODirEntry *entry = NULL;
    AVIODirContext *ctx = NULL;
    int ret;

    av_log_set_level(AV_LOG_DEBUG);

    if ((ret = avio_open_dir(&ctx, "./", NULL)) < 0) {
        av_log(NULL, AV_LOG_ERROR, "Cannot open directory: %s.\n", av_err2str(ret));
        goto fail;
    }

    while(1){
        if ((ret = avio_read_dir(ctx, &entry)) < 0) {
            av_log(NULL, AV_LOG_ERROR, "Cannot list directory: %s.\n", av_err2str(ret));
            goto fail;
        }
        if (!entry)  //当前目录中读不到列表
            break;

        av_log(NULL, AV_LOG_INFO, "%-9s %12"PRId64" %30s %16"PRId64" %16"PRId64" %16"PRId64"\n",
               type_string(entry->type),
               entry->size,
               entry->name,
               entry->modification_timestamp,
               entry->access_timestamp,
               entry->status_change_timestamp);
    avio_free_directory_entry(&entry);  //读完当前列表就close
    }
fail:
    avio_close_dir(&ctx); //当前路径关掉，entry相当于当前路径中的每个列表内容
    return 0;
}

1）avio_open/read/close_dir要包含avio.h，av_err2str在error.h中，
2）PRId64需要#include <inttypes.h>，这是一种跨平台的书写方式，主要是为了同时支持32位和64位操作系统。PRId64表示64位整数，在32位系统中表示long long int，在64位系统中表示long int。相当于：

printf("%" "ld" "\n", value); //64bit OS
printf("%" "lld" "\n", value); //32bit OS

2. gcc编译，生成可执行dir文件

gcc -g -o dir dir.c  `pkg-config -cflags --libs  libavformat libavutil`

3. 执行dir

$ ./dir
<FILE>       744397468          aspect_ratio_SD188.ts 1725330324000000 1725330521000000 1725330324000000
<FILE>           19536                            dir 1725454816000000 1725454828000000 1725454816000000
<FILE>             554                  ffmpeg_file.c 1725421127000000 1725421132000000 1725421127000000
<DIR>             4096                         ffmpeg 1725244680000000 1725358851000000 1725244680000000
<FILE>               0                         10s.ts 1725330119000000 1725330136000000 1725330119000000
<FILE>      3993753600                        out.yuv 1725251667000000 1725251967000000 1725251667000000
<FILE>            1818                          dir.c 1725454814000000 1725454816000000 1725454814000000
<FILE>          496740                        out.pcm 1725252158000000 1725252234000000 1725252158000000
<FILE>           17264                     ffmpeg_log 1725419216000000 1725419216000000 1725419216000000
<FILE>         3932160            event_eachts_192.ts 1725250668000000 1725250726000000 1725250668000000
<DIR>             4096                        minghao 1725421799000000 1725421725000000 1725421799000000
<FILE>               0                          10.ts 1725330584000000 1725330521000000 1725330584000000
<FILE>        10635194                       game.flv 1725359634000000 1725359652000000 1725359634000000
<FILE>             168                   ffmpeg_log.c 1725416437000000 1725416446000000 1725416437000000
<FILE>         3237360                         out.ts 1725329375000000 1725329428000000 1725329375000000