树莓派之hello_video循环播放视频

// Video deocode demo using OpenMAX IL though the ilcient helper library

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "bcm_host.h"
#include "ilclient.h"

static int video_decode_test(char *filename)
{
   OMX_VIDEO_PARAM_PORTFORMATTYPE format;
   OMX_TIME_CONFIG_CLOCKSTATETYPE cstate;
   COMPONENT_T *video_decode = NULL, *video_scheduler = NULL, *video_render = NULL, *clock = NULL;
   COMPONENT_T *list[5];
   TUNNEL_T tunnel[4];
   ILCLIENT_T *client;
   FILE *in;
   int status = 0;
   unsigned int data_len = 0;

   memset(list, 0, sizeof(list));
   memset(tunnel, 0, sizeof(tunnel));

   if((in = fopen(filename, "rb")) == NULL)
      return -2;

   if((client = ilclient_init()) == NULL)
   {
      fclose(in);
      return -3;
   }

   if(OMX_Init() != OMX_ErrorNone)
   {
      ilclient_destroy(client);
      fclose(in);
      return -4;
   }

   // create video_decode
   if(ilclient_create_component(client, &video_decode, "video_decode", ILCLIENT_DISABLE_ALL_PORTS | ILCLIENT_ENABLE_INPUT_BUFFERS) != 0)
      status = -14;
   list[0] = video_decode;

   // create video_render
   if(status == 0 && ilclient_create_component(client, &video_render, "video_render", ILCLIENT_DISABLE_ALL_PORTS) != 0)
      status = -14;
   list[1] = video_render;

   // create clock
   if(status == 0 && ilclient_create_component(client, &clock, "clock", ILCLIENT_DISABLE_ALL_PORTS) != 0)
      status = -14;
   list[2] = clock;

   memset(&cstate, 0, sizeof(cstate));
   cstate.nSize = sizeof(cstate);
   cstate.nVersion.nVersion = OMX_VERSION;
   cstate.eState = OMX_TIME_ClockStateWaitingForStartTime;
   cstate.nWaitMask = 1;
   if(clock != NULL && OMX_SetParameter(ILC_GET_HANDLE(clock), OMX_IndexConfigTimeClockState, &cstate) != OMX_ErrorNone)
      status = -13;

   // create video_scheduler
   if(status == 0 && ilclient_create_component(client, &video_scheduler, "video_scheduler", ILCLIENT_DISABLE_ALL_PORTS) != 0)
      status = -14;
   list[3] = video_scheduler;

   set_tunnel(tunnel, video_decode, 131, video_scheduler, 10);
   set_tunnel(tunnel+1, video_scheduler, 11, video_render, 90);
   set_tunnel(tunnel+2, clock, 80, video_scheduler, 12);

   // setup clock tunnel first
   if(status == 0 && ilclient_setup_tunnel(tunnel+2, 0, 0) != 0)
      status = -15;
   else
      ilclient_change_component_state(clock, OMX_StateExecuting);

   if(status == 0)
      ilclient_change_component_state(video_decode, OMX_StateIdle);

   memset(&format, 0, sizeof(OMX_VIDEO_PARAM_PORTFORMATTYPE));
   format.nSize = sizeof(OMX_VIDEO_PARAM_PORTFORMATTYPE);
   format.nVersion.nVersion = OMX_VERSION;
   format.nPortIndex = 130;
   format.eCompressionFormat = OMX_VIDEO_CodingAVC;

   if(status == 0 &&
      OMX_SetParameter(ILC_GET_HANDLE(video_decode), OMX_IndexParamVideoPortFormat, &format) == OMX_ErrorNone &&
      ilclient_enable_port_buffers(video_decode, 130, NULL, NULL, NULL) == 0)
   {
      OMX_BUFFERHEADERTYPE *buf;
      int port_settings_changed = 0;
      int first_packet = 1;

      ilclient_change_component_state(video_decode, OMX_StateExecuting);

      while((buf = ilclient_get_input_buffer(video_decode, 130, 1)) != NULL)
      {
     // feed data and wait until we get port settings changed
     unsigned char *dest = buf->pBuffer;

     // loop if at end
     if (feof(in))
         rewind(in);

     data_len += fread(dest, 1, buf->nAllocLen-data_len, in);

     if(port_settings_changed == 0 &&
        ((data_len > 0 && ilclient_remove_event(video_decode, OMX_EventPortSettingsChanged, 131, 0, 0, 1) == 0) ||
         (data_len == 0 && ilclient_wait_for_event(video_decode, OMX_EventPortSettingsChanged, 131, 0, 0, 1,
                               ILCLIENT_EVENT_ERROR | ILCLIENT_PARAMETER_CHANGED, 10000) == 0)))
     {
        port_settings_changed = 1;

        if(ilclient_setup_tunnel(tunnel, 0, 0) != 0)
        {
           status = -7;
           break;
        }

        ilclient_change_component_state(video_scheduler, OMX_StateExecuting);

        // now setup tunnel to video_render
        if(ilclient_setup_tunnel(tunnel+1, 0, 1000) != 0)
        {
           status = -12;
           break;
        }

        ilclient_change_component_state(video_render, OMX_StateExecuting);
     }
     if(!data_len)
        break;

     buf->nFilledLen = data_len;
     data_len = 0;

     buf->nOffset = 0;
     if(first_packet)
     {
        buf->nFlags = OMX_BUFFERFLAG_STARTTIME;
        first_packet = 0;
     }
     else
        buf->nFlags = OMX_BUFFERFLAG_TIME_UNKNOWN;

     if(OMX_EmptyThisBuffer(ILC_GET_HANDLE(video_decode), buf) != OMX_ErrorNone)
     {
        status = -6;
        break;
     }
      }

      buf->nFilledLen = 0;
      buf->nFlags = OMX_BUFFERFLAG_TIME_UNKNOWN | OMX_BUFFERFLAG_EOS;

      if(OMX_EmptyThisBuffer(ILC_GET_HANDLE(video_decode), buf) != OMX_ErrorNone)
     status = -20;

      // wait for EOS from render
      ilclient_wait_for_event(video_render, OMX_EventBufferFlag, 90, 0, OMX_BUFFERFLAG_EOS, 0,
                  ILCLIENT_BUFFER_FLAG_EOS, -1);

      // need to flush the renderer to allow video_decode to disable its input port
      ilclient_flush_tunnels(tunnel, 0);

   }

   fclose(in);

   ilclient_disable_tunnel(tunnel);
   ilclient_disable_tunnel(tunnel+1);
   ilclient_disable_tunnel(tunnel+2);
   ilclient_disable_port_buffers(video_decode, 130, NULL, NULL, NULL);
   ilclient_teardown_tunnels(tunnel);

   ilclient_state_transition(list, OMX_StateIdle);
   ilclient_state_transition(list, OMX_StateLoaded);

   ilclient_cleanup_components(list);

   OMX_Deinit();

   ilclient_destroy(client);
   return status;
}

int main (int argc, char **argv)
{
   if (argc < 2) {
      printf("Usage: %s <filename>\n", argv[0]);
      exit(1);
   }
   bcm_host_init();
   return video_decode_test(argv[1]);
}