查看libRTMP study的源代码 libRTMP study 0

=rtmpdump=
source code download:
 git clone git://git.ffmpeg.org/rtmpdump

Calling flow:
1. Init
    RTMP_LogSetLevel(level);
    RTMP_LogSetCallback(rtmp_log);
      static void rtmp_log(int level, const char *fmt, va_list args)
    RTMP *r = {};
    RTMP_Init(r); //init RTMP. BufferMS=30000,
 
 filename = " "+ 
 app=   
 tcUrl= 
 pageUrl=
 swfUrl=
 flashVer=
 conn=
 live=1
 subscribe=
 buffer=
 swfUrl=
 swfVfy=1
   
2. Setup
    RTMP_SetupURL(r, filename)
    RTMP_EnableWrite(r); //r->Link.protocol |= RTMP_FEATURE_WRITE;
    RTMP_Connect(r, NULL)
    RTMP_ConnectStream(r, 0)
    //
    setsockopt()
3. write
    RTMP_Write(r, buf, size);
4. read
    RTMP_Read(r, buf, size);
    RTMP_Pause(r, pause);
    RTMP_SendSeek(r, timestamp);
5. close
   RTMP_Close(r)
   RTMP_Free(RTMP *r) // free(r)

= FFMPEG default use = 
ffmpeg/libavformat/rtmpproto.c

<source lang="c">
const URLProtocol ff_rtmp[e|s|t|te|ts]_protocol = {     \
    .name           = rtmp[e|s|t|te|ts],                   \
    .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= &rtmp[e|s|t|te|ts]_class,           \
};
#define RTMP_PROTOCOL(rtmp[e|s|t|te|ts]) 
static const AVClass rtmp[e|s|t|te|ts]##_class = {          \
    .class_name = #rtmp[e|s|t|te|ts],                       \
    .item_name  = av_default_item_name,          \
    .option     = rtmp_options,                  \
    .version    = LIBAVUTIL_VERSION_INT,         \
};  
static const AVOption rtmp_options[] = {
    {"rtmp_app", "Name of application to connect to on the RTMP server", OFFSET(app), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
    {"rtmp_buffer", "Set buffer time in milliseconds. The default is 3000.", OFFSET(client_buffer_time), AV_OPT_TYPE_INT, {.i64 = 3000}, 0, INT_MAX, DEC|ENC},
    {"rtmp_conn", "Append arbitrary AMF data to the Connect message", OFFSET(conn), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
    {"rtmp_flashver", "Version of the Flash plugin used to run the SWF player.", OFFSET(flashver), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
    {"rtmp_flush_interval", "Number of packets flushed in the same request (RTMPT only).", OFFSET(flush_interval), AV_OPT_TYPE_INT, {.i64 = 10}, 0, INT_MAX, ENC},
    {"rtmp_live", "Specify that the media is a live stream.", OFFSET(live), AV_OPT_TYPE_INT, {.i64 = -2}, INT_MIN, INT_MAX, DEC, "rtmp_live"},
    {"any", "both", 0, AV_OPT_TYPE_CONST, {.i64 = -2}, 0, 0, DEC, "rtmp_live"},
    {"live", "live stream", 0, AV_OPT_TYPE_CONST, {.i64 = -1}, 0, 0, DEC, "rtmp_live"},
    {"recorded", "recorded stream", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, DEC, "rtmp_live"},
    {"rtmp_pageurl", "URL of the web page in which the media was embedded. By default no value will be sent.", OFFSET(pageurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
    {"rtmp_playpath", "Stream identifier to play or to publish", OFFSET(playpath), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
    {"rtmp_subscribe", "Name of live stream to subscribe to. Defaults to rtmp_playpath.", OFFSET(subscribe), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
    {"rtmp_swfhash", "SHA256 hash of the decompressed SWF file (32 bytes).", OFFSET(swfhash), AV_OPT_TYPE_BINARY, .flags = DEC},
    {"rtmp_swfsize", "Size of the decompressed SWF file, required for SWFVerification.", OFFSET(swfsize), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC},
    {"rtmp_swfurl", "URL of the SWF player. By default no value will be sent", OFFSET(swfurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
    {"rtmp_swfverify", "URL to player swf file, compute hash/size automatically.", OFFSET(swfverify), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
    {"rtmp_tcurl", "URL of the target stream. Defaults to proto://host[:port]/app.", OFFSET(tcurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
    {"rtmp_listen", "Listen for incoming rtmp connections", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtmp_listen" },
    {"listen",      "Listen for incoming rtmp connections", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtmp_listen" },
    {"timeout", "Maximum timeout (in seconds) to wait for incoming connections. -1 is infinite. Implies -rtmp_listen 1",  OFFSET(listen_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC, "rtmp_listen" },
    { NULL },
};

</source>
declared in libformat/protocols.c
<source lang="c">
extern const URLProtocol ff_rtmp_protocol;
extern const URLProtocol ff_rtmpe_protocol;
extern const URLProtocol ff_rtmps_protocol;
extern const URLProtocol ff_rtmpt_protocol;
extern const URLProtocol ff_rtmpte_protocol;
extern const URLProtocol ff_rtmpts_protocol;
</source>
libavformat/protocol_list.c
<source lang="c">
static const URLProtocol *url_protocols[] = {
    &&ff_rtmp_protocol,
    ....
}
</source>
libavformat/makefile
<source lang="c">
OBJS-$(CONFIG_RTMP_PROTOCOL)  += rtmpproto.o rtmpdigest.o rtmppkt.o
OBJS-$(CONFIG_LIBRTMP_PROTOCOL)          += librtmp.o
OBJS-$(CONFIG_LIBRTMPE_PROTOCOL)         += librtmp.o
OBJS-$(CONFIG_LIBRTMPS_PROTOCOL)         += librtmp.o
OBJS-$(CONFIG_LIBRTMPT_PROTOCOL)         += librtmp.o
OBJS-$(CONFIG_LIBRTMPTE_PROTOCOL)        += librtmp.o

SKIPHEADERS-$(CONFIG_FFRTMPCRYPT_PROTOCOL) += rtmpdh.h
OBJS-$(CONFIG_FFRTMPCRYPT_PROTOCOL)      += rtmpcrypt.o rtmpdigest.o rtmpdh.o
OBJS-$(CONFIG_FFRTMPHTTP_PROTOCOL)       += rtmphttp.o
</source>

ffmpeg/libavformat/rtmpproto.c
<source lang="c">
/**
 * Open RTMP connection and verify that the stream can be played.
 *
 * URL syntax: rtmp://server[:port][/app][/playpath][ keyword=value]...
 */
static int rtmp_open(URLContext *s, const char *uri, int flags, AVDictionary **opts)

</source>
ffmpeg/config.h
<source lang="c">
#define CONFI_RTMP_PROTOCOL 1
</source>
config.mak
<source lang="c">
CONFIG_RTMP_PROTOCOL=yes
</source>


Calling flow:


Log:
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] Setting codecpar->delay to 2 for stream st: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] Processing st: 1, edit list 0 - media time: 2048, duration: 21168000
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] drop a frame at curr_cts: 0 @ 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] drop a frame at curr_cts: 1024 @ 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] Before avformat_find_stream_info() pos: 385043 bytes read:402457 seeks:0 nb_streams:2
[h264 @ 0x29ab280] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x29ab280] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x29ab280] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 0x29ab280] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x29ab280] Format yuv420p chosen by get_format().
[h264 @ 0x29ab280] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0x29ab280] no picture 
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] demuxer injecting skip 2048 / discard 0
[aac @ 0x29afc80] skip 2048 / discard 0 samples due to side data
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x29a9800] After avformat_find_stream_info() pos: 450824 bytes read:483220 seeks:0 frames:2
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/jammy/test.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.15.102
  Duration: 00:08:00.05, start: 0.000000, bitrate: 4817 kb/s
    Stream #0:0(und), 1, 1/12800: Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 0/1, 4683 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und), 1, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Successfully opened the file.
Parsing a group of options: output url rtmp://localhost/myapp/mystream.
Applying option c (codec name) with argument copy.
Applying option f (force format) with argument flv.
Successfully parsed a group of options.
Opening an output file: rtmp://localhost/myapp/mystream.
[rtmp @ 0x2a2e300] No default whitelist set
[tcp @ 0x2a2e240] No default whitelist set
[tcp @ 0x2a2e240] Original list of addresses:
[tcp @ 0x2a2e240] Address 127.0.0.1 port 1935
[tcp @ 0x2a2e240] Interleaved list of addresses:
[tcp @ 0x2a2e240] Address 127.0.0.1 port 1935
[tcp @ 0x2a2e240] Starting connection attempt to 127.0.0.1 port 1935
[tcp @ 0x2a2e240] Successfully connected to 127.0.0.1 port 1935
[rtmp @ 0x2a2e300] Handshaking...
[rtmp @ 0x2a2e300] Type answer 3
[rtmp @ 0x2a2e300] Server version 13.14.10.13
[rtmp @ 0x2a2e300] Proto = rtmp, path = /myapp/mystream, app = myapp, fname = mystream
[rtmp @ 0x2a2e300] Window acknowledgement size = 5000000
[rtmp @ 0x2a2e300] Max sent, unacked = 5000000
[rtmp @ 0x2a2e300] New incoming chunk size = 4096
[rtmp @ 0x2a2e300] Releasing stream...
[rtmp @ 0x2a2e300] FCPublish stream...
[rtmp @ 0x2a2e300] Creating stream...
[rtmp @ 0x2a2e300] Sending publish command for 'mystream'
Successfully opened the file.
Output #0, flv, to 'rtmp://localhost/myapp/mystream':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.30.100
    Stream #0:0(und), 0, 1/1000: Video: h264 (High), 1 reference frame ([7][0][0][0] / 0x0007), yuv420p(left), 1920x1080 (0x0), 0/1, q=2-31, 4683 kb/s, 25 fps, 25 tbr, 1k tbn, 12800 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und), 0, 1/1000: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:1 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
    Last message repeated 1 times
frame=   15 fps=0.0 q=-1.0 size=     379kB time=00:00:00.51 bitrate=6079.8kbits/frame=   28 fps= 28 q=-1.0 size=     715kB time=00:00:01.02 bitrate=5735.0kbits/frame=   41 fps= 27 q=-1.0 size=     981kB time=00:00:01.52 bitrate=5285.2kbits/frame=   54 fps= 27 q=-1.0 size=    1280kB time=00:00:02.04 bitrate=5135.7kbits/frame=   66 fps= 26 q=-1.0 size=    1668kB time=00:00:02.55 bitrate=5351.0kbits/frame=   79 fps= 26 q=-1.0 size=    1907kB time=00:00:03.04 bitrate=5136.1kbits/frame=   91 fps= 26 q=-1.0 size=    2163kB time=00:00:03.55 bitrate=4988.2kbits/[flv @ 0x29ac580] Failed to update header with correct duration.
[flv @ 0x29ac580] Failed to update header with correct filesize.
frame=   94 fps= 26 q=-1.0 Lsize=    2197kB time=00:00:03.66 bitrate=4904.6kbits/s speed=   1x    
video:2133kB audio:59kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.228048%
Input file #0 (/home/jammy/test.mp4):
  Input stream #0:0 (video): 94 packets read (2183894 bytes); 
  Input stream #0:1 (audio): 161 packets read (60374 bytes); 
  Total: 255 packets (2244268 bytes) demuxed
Output file #0 (rtmp://localhost/myapp/mystream):
  Output stream #0:0 (video): 94 packets muxed (2183894 bytes); 
  Output stream #0:1 (audio): 161 packets muxed (60374 bytes); 
  Total: 255 packets (2244268 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x2a2e080] Statistics: 0 seeks, 281 writeouts
[rtmp @ 0x2a2e300] UnPublishing stream...
[rtmp @ 0x2a2e300] Deleting stream...
[AVIOContext @ 0x29b2580] Statistics: 2630641 bytes read, 0 seeks
Exiting normally, received signal 2.

= How to use librtmp in ffmpeg =
cd ffmpeg root
vi config.h
<source lang="c">
#define CONFIG_LIBRTMP 1
#define CONFIG_LIBRTMP_PROTOCOL 1
#define CONFIG_RTMP_PROTOCOL 0
</source>
 ./configure --list-protocols
 libremp librtmpe librtmps librtmpt librtmpte
configure create protocol_list.c from PROTOCOL_LIST parsered "URLProtocol" from libavformat/protocols.c 
so move ff_librtmp_protocol in front of ff_rtmp_protocol in prorocols.c

 ./configure --disable-x86asm ( I don't have asm)

check libavformat/protocol_lists.c, we have &ff_librtmp_protocol added.
 
 make 
 sudo make install

libavformat/makefile
<source lang="c">
OBJS-$(CONFIG_RTMP_PROTOCOL)  += rtmpproto.o rtmpdigest.o rtmppkt.o
OBJS-$(CONFIG_LIBRTMP_PROTOCOL)          += librtmp.o
OBJS-$(CONFIG_LIBRTMPE_PROTOCOL)         += librtmp.o
OBJS-$(CONFIG_LIBRTMPS_PROTOCOL)         += librtmp.o
OBJS-$(CONFIG_LIBRTMPT_PROTOCOL)         += librtmp.o
OBJS-$(CONFIG_LIBRTMPTE_PROTOCOL)        += librtmp.o

SKIPHEADERS-$(CONFIG_FFRTMPCRYPT_PROTOCOL) += rtmpdh.h
OBJS-$(CONFIG_FFRTMPCRYPT_PROTOCOL)      += rtmpcrypt.o rtmpdigest.o rtmpdh.o
OBJS-$(CONFIG_FFRTMPHTTP_PROTOCOL)       += rtmphttp.o
</source>