stream: kill start_pos, remove --sb option

stream.start_pos was needed for optical media only, and (apparently) not
for very good reasons. Just get rid of it.

For stream_dvd, we don't need to do anything. Byte seeking was already
removed from it earlier.

For stream_cdda and stream_vcd, emulate the start_pos by offsetting the
stream pos as seen by the rest of mpv.

The bits in discnav.c and loadfile.c were for dealing with the code
seeking back to the start in demux.c. Handle this differently by
assuming the demuxer is always initialized with the stream at start
position, and instead seek back if initializing the demuxer fails.

Remove the --sb option, which worked by modifying stream.start_pos. If
someone really wants this option, it could be added back by creating a
"slice" stream (actually ffmpeg already has such a thing).

1 files changed, 1 insertions, 1 deletions

diff --git a/stream/stream.h b/stream/stream.h
index 3675ea9732..2182de2526 100644
--- a/stream/stream.h
+++ b/stream/stream.h
@@ -147,7 +147,7 @@ typedef struct stream {
     int sector_size; // sector size (seek will be aligned on this size if non 0)
     int read_chunk; // maximum amount of data to read at once to limit latency
     unsigned int buf_pos, buf_len;
-    int64_t pos, start_pos, end_pos;
+    int64_t pos, end_pos;
     int eof;
     int mode; //STREAM_READ or STREAM_WRITE
     bool streaming;     // known to be a network stream if true