流媒体分析之rtmp ffmpeg 实现-两种技术实现

ffmpeg rtmp 流媒体实现有两种方式，一种是基于librtmp实现：libavformat/librtmp.c

 
#define RTMP_CLASS(flavor)\
static const AVClass lib ## flavor ## _class = {\
    .class_name = "lib" #flavor " protocol",\
    .item_name  = av_default_item_name,\
    .option     = options,\
    .version    = LIBAVUTIL_VERSION_INT,\
};
 
RTMP_CLASS(rtmp)
const URLProtocol ff_librtmp_protocol = {
    .name                = "rtmp",
    .url_open            = rtmp_open,
    .url_read            = rtmp_read,
    .url_write           = rtmp_write,
    .url_close           = rtmp_close,
    .url_read_pause      = rtmp_read_pause,
    .url_read_seek       = rtmp_read_seek,
    .url_get_file_handle = rtmp_get_file_handle,
    .priv_data_size      = sizeof(LibRTMPContext),
    .priv_data_class     = &librtmp_class,
    .flags               = URL_PROTOCOL_FLAG_NETWORK,
};
 
RTMP_CLASS(rtmpt)
const URLProtocol ff_librtmpt_protocol = {
    .name                = "rtmpt",
    .url_open            = rtmp_open,
    .url_read            = rtmp_read,
    .url_write           = rtmp_write,
    .url_close           = rtmp_close,
    .url_read_pause      = rtmp_read_pause,
    .url_read_seek       = rtmp_read_seek,
    .url_get_file_handle = rtmp_get_file_handle,
    .priv_data_size      = sizeof(LibRTMPContext),
    .priv_data_class     = &librtmpt_class,
    .flags               = URL_PROTOCOL_FLAG_NETWORK,
};
 
RTMP_CLASS(rtmpe)
const URLProtocol ff_librtmpe_protocol = {
    .name                = "rtmpe",
    .url_open            = rtmp_open,
    .url_read            = rtmp_read,
    .url_write           = rtmp_write,
    .url_close           = rtmp_close,
    .url_read_pause      = rtmp_read_pause,
    .url_read_seek       = rtmp_read_seek,
    .url_get_file_handle = rtmp_get_file_handle,
    .priv_data_size      = sizeof(LibRTMPContext),
    .priv_data_class     = &librtmpe_class,
    .flags               = URL_PROTOCOL_FLAG_NETWORK,
};
 
RTMP_CLASS(rtmpte)
const URLProtocol ff_librtmpte_protocol = {
    .name                = "rtmpte",
    .url_open            = rtmp_open,
    .url_read            = rtmp_read,
    .url_write           = rtmp_write,
    .url_close           = rtmp_close,
    .url_read_pause      = rtmp_read_pause,
    .url_read_seek       = rtmp_read_seek,
    .url_get_file_handle = rtmp_get_file_handle,
    .priv_data_size      = sizeof(LibRTMPContext),
    .priv_data_class     = &librtmpte_class,
    .flags               = URL_PROTOCOL_FLAG_NETWORK,
};
 
RTMP_CLASS(rtmps)
const URLProtocol ff_librtmps_protocol = {
    .name                = "rtmps",
    .url_open            = rtmp_open,
    .url_read            = rtmp_read,
    .url_write           = rtmp_write,
    .url_close           = rtmp_close,
    .url_read_pause      = rtmp_read_pause,
    .url_read_seek       = rtmp_read_seek,
    .url_get_file_handle = rtmp_get_file_handle,
    .priv_data_size      = sizeof(LibRTMPContext),
    .priv_data_class     = &librtmps_class,
    .flags               = URL_PROTOCOL_FLAG_NETWORK,
};

 一种是ffmpeg 自己实现的rtmp 协议 libavformat/rtmpproto.c

#define RTMP_PROTOCOL(flavor)                    \
static const AVClass flavor##_class = {          \
    .class_name = #flavor,                       \
    .item_name  = av_default_item_name,          \
    .option     = rtmp_options,                  \
    .version    = LIBAVUTIL_VERSION_INT,         \
};                                               \
                                                 \
const URLProtocol ff_##flavor##_protocol = {     \
    .name           = #flavor,                   \
    .url_open2      = rtmp_open,                 \
    .url_read       = rtmp_read,                 \
    .url_read_seek  = rtmp_seek,                 \
    .url_read_pause = rtmp_pause,                \
    .url_write      = rtmp_write,                \
    .url_close      = rtmp_close,                \
    .priv_data_size = sizeof(RTMPContext),       \
    .flags          = URL_PROTOCOL_FLAG_NETWORK, \
    .priv_data_class= &flavor##_class,           \
};
 
 
RTMP_PROTOCOL(rtmp)
RTMP_PROTOCOL(rtmpe)
RTMP_PROTOCOL(rtmps)
RTMP_PROTOCOL(rtmpt)
RTMP_PROTOCOL(rtmpte)
RTMP_PROTOCOL(rtmpts)