avformat: remove more unneeded avio_flush() calls

These instances are simply redundant or present because avio_flush() used to be
required before doing a seekback. That is no longer the case, aviobuf code does
the flush automatically on seek.

This only affects code which is either disabled for streaming IO contexts or
does no seekbacks after the flush, so this change should have no adverse effect
on streaming.
Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/asfenc.c

@@ -1130,7 +1130,6 @@ static int asf_write_trailer(AVFormatContext *s)
             return ret;
         asf_write_index(s, asf->index_ptr, asf->maximum_packet, asf->next_start_sec);
     }
-    avio_flush(s->pb);
 
     if (asf->is_streamed || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
         put_chunk(s, 0x4524, 0, 0); /* end of stream */

libavformat/avienc.c

@@ -591,7 +591,6 @@ static void update_odml_entry(AVFormatContext *s, int stream_index, int64_t ix,
     int64_t pos;
     int au_byterate, au_ssize, au_scale;
 
-    avio_flush(pb);
     pos = avio_tell(pb);
 
     /* Updating one entry in the AVI OpenDML master index */

libavformat/gxfenc.c

@@ -863,13 +863,11 @@ static int gxf_write_trailer(AVFormatContext *s)
         return ret;
     gxf_write_flt_packet(s);
     gxf_write_umf_packet(s);
-    avio_flush(pb);
     /* update duration in all map packets */
     for (i = 1; i < gxf->map_offsets_nb; i++) {
         avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
         if ((ret = gxf_write_map_packet(s, 1)) < 0)
             return ret;
-        avio_flush(pb);
     }
 
     avio_seek(pb, end, SEEK_SET);

libavformat/segafilmenc.c

@@ -362,8 +362,6 @@ static int film_write_header(AVFormatContext *format_context)
 
     avio_wb32(pb, film->packet_count);
 
-    avio_flush(pb);
-
     /* Finally, write out each packet's data to the header */
     packet = film->start;
     while (packet != NULL) {

libavformat/wavenc.c

@@ -411,17 +411,13 @@ static int wav_write_trailer(AVFormatContext *s)
     int rf64 = 0;
     int ret = 0;
 
-    avio_flush(pb);
-
     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
         if (wav->write_peak != PEAK_ONLY && avio_tell(pb) - wav->data < UINT32_MAX) {
             ff_end_tag(pb, wav->data);
-            avio_flush(pb);
         }
 
         if (wav->write_peak && wav->peak_output) {
             ret = peak_write_chunk(s);
-            avio_flush(pb);
         }
 
         /* update file size */
@@ -433,8 +429,6 @@ static int wav_write_trailer(AVFormatContext *s)
             avio_seek(pb, 4, SEEK_SET);
             avio_wl32(pb, (uint32_t)(file_size - 8));
             avio_seek(pb, file_size, SEEK_SET);
-
-            avio_flush(pb);
         } else {
             av_log(s, AV_LOG_ERROR,
                    "Filesize %"PRId64" invalid for wav, output file will be broken\n",
@@ -454,7 +448,6 @@ static int wav_write_trailer(AVFormatContext *s)
             } else {
                 avio_wl32(pb, number_of_samples);
                 avio_seek(pb, file_size, SEEK_SET);
-                avio_flush(pb);
             }
         }