Fix reading input for FIFO (#436)

If input object is FIFO, fseek doesn’t work on it.
Remove the fseek logic and save the bytes in buffer for file, stdin, FIFO input objects.

Signed-off-by: Jun Tian <[email protected]>

Author: tianjunwork

Source/App/EbAppInputy4m.c

@@ -345,12 +345,7 @@ EB_BOOL check_if_y4m(EbConfig_t *cfg) {
         return EB_TRUE; /* YUV4MPEG2 file */
     }
     else {
-        if (cfg->inputFile != stdin) {
-            fseek(cfg->inputFile, 0, SEEK_SET);
-        }
-        else {
-            EB_STRNCPY((char*)cfg->y4m_buf, sizeof(cfg->y4m_buf), (char*)buffer, YUV4MPEG2_IND_SIZE);
-        }
+        EB_STRNCPY((char*)cfg->y4m_buf, sizeof(cfg->y4m_buf), (char*)buffer, YUV4MPEG2_IND_SIZE);
         return EB_FALSE; /* Not a YUV4MPEG2 file */
     }
 }

Source/App/EbAppProcessCmd.c

@@ -821,9 +821,9 @@ static void ReadInputFrames(
                     read_y4m_frame_delimiter(config);
                 const uint32_t lumaReadSize = inputPaddedWidth * inputPaddedHeight << is16bit;
                 ebInputPtr = inputPtr->luma;
-                if (config->y4m_input == EB_FALSE && config->processedFrameCount == 0 && config->inputFile == stdin) {
-                    /* if not a y4m file and input is read from stdin, 9 bytes were already read when checking
-                       or the YUV4MPEG2 string in the stream, so copy those bytes over */
+                if (config->y4m_input == EB_FALSE && config->processedFrameCount == 0) {
+                    /* if not a y4m file, 9 bytes were already read when checking
+                       the YUV4MPEG2 string in the stream, so copy those bytes over */
                     memcpy(ebInputPtr, config->y4m_buf, YUV4MPEG2_IND_SIZE);
                     headerPtr->nFilledLen += YUV4MPEG2_IND_SIZE;
                     ebInputPtr += YUV4MPEG2_IND_SIZE;