snapshot from sout

const char *const vlc_args[] = {
"-I=dummy",
"--vout=dummy",
"--network-caching=5000",
  "--sout=#duplicate{dst=display,dst=rtp{sdp=rtsp://:8554/ch1}}", "--sout-all", "--sout-keep",  "--verbose=2",
"--file-logging", logFile,
};

int vlc_argc = sizeof(vlc_args) / sizeof(vlc_args[0]);

vlcInstance = libvlc_new(vlc_argc, vlc_args);

const char *psz_mrl = "rtsp://169.254.1.168:554/live2.sdp";

media = libvlc_media_new_location(vlcInstance, psz_mrl);

mp = libvlc_media_player_new_from_media(media);

libvlc_media_release(media);

libvlc_media_player_play(mp);

---

snapshot 需要 input_resource_t, 所以重點是傳遞 input_resource_t 的位址

vi ../modules/stream_out/display.c

    p_sys->p_resource = input_resource_New( p_this );

    var_Create(p_stream, "sout-display-input-resource", VLC_VAR_ADDRESS);

    var_SetAddress(p_stream, "sout-display-input-resource", p_sys->p_resource);

    msg_Dbg(p_stream, "display.Open set input_resource_t(%p) to sout_stream_t SSS", p_sys->p_resource);

將 input_resource_t 的位址，從 sout_stream_t 傳到 sout_instance_t

vi ../src/stream_output/stream_output.c

static sout_stream_t *sout_StreamNew( sout_instance_t *p_sout, char *psz_name,

                               config_chain_t *p_cfg, sout_stream_t *p_next)

{

    p_stream->p_module =

        module_need( p_stream, "sout stream", p_stream->psz_name, true );

    input_resource_t *p_resource = var_GetAddress(p_stream, "sout-display-input-resource");

    if (p_resource != NULL) {

        var_Create(p_sout, "sout-display-input-resource", VLC_VAR_ADDRESS);

        var_SetAddress(p_sout, "sout-display-input-resource", p_resource);

        msg_Dbg(p_sout, "stream_output:sout_StreamNew set input_resource_t(%p) from sout_stream_t to sout_instance_t SSS", p_resource);

    }

}

將 input_resource_t 的位址，從 sout_instance_t 傳到 input_thread_t

vi ../src/input/input.c

static int Init( input_thread_t * p_input )

{

    if (p_input->p->p_sout) {

        input_resource_t *p_resource = var_GetAddress(p_input->p->p_sout, "sout-display-input-resource");

        if (p_resource != NULL) {

            var_Create(p_input, "sout-display-input-resource", VLC_VAR_ADDRESS);

            var_SetAddress(p_input, "sout-display-input-resource", p_resource);

            msg_Dbg(p_input, "input.Init send input_resource_t(%p) from input_thread_t->p->p_sout to input_thread_t SSS", p_resource);

        }

    }

}

snapshot 是利用 vout_thread_t

vi ../lib/video.c

int libvlc_video_take_snapshot( libvlc_media_player_t *p_mi, unsigned num,

                            const char *psz_filepath,

                            unsigned int i_width, unsigned int i_height )

{

    vout_thread_t *p_vout = GetVout (p_mi, num);

}

GetVout -> GetVouts -> input_Control(INPUT_GET_VOUTS) -> input_vaControl

利用 input_resource_HoldVouts, 取得 vout_thread_t

vi ../src/input/control.c

int input_vaControl( input_thread_t *p_input, int i_query, va_list args )

{

        case INPUT_GET_VOUTS:

        {

            vout_thread_t ***ppp_vout = (vout_thread_t***)va_arg( args, vout_thread_t*** );

            size_t        *pi_vout = va_arg( args, size_t * );

            input_resource_HoldVouts( p_input->p->p_resource, ppp_vout, pi_vout );

            if( *pi_vout <= 0 ) { // 找不到，更換另一個 input_resource_t

                input_resource_t *p_resource = var_GetAddress(p_input, "sout-display-input-resource");

                msg_Dbg(p_input, "control.input_vaControl input_resource_HoldVouts(sout-display-input-resource) SSS");

                input_resource_HoldVouts(p_resource, ppp_vout, pi_vout);

            }

            if( *pi_vout <= 0 ) {

                return VLC_EGENERIC;

            }

            return VLC_SUCCESS;

        }

}