* Method 2:
****************************************************************************/
static int AStreamRefillStream( stream_t *s );
+static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read );
static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read )
{
stream_sys_t *p_sys = s->p_sys;
- stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
-
- uint8_t *p_data = (uint8_t *)p_read;
- unsigned int i_data = 0;
-
- if( tk->i_start >= tk->i_end )
- return 0; /* EOF */
-
- if( p_data == NULL )
- {
- /* seek within this stream if possible, else use plain old read and discard */
- stream_sys_t *p_sys = s->p_sys;
- access_t *p_access = p_sys->p_access;
-
- bool b_aseek;
- access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
- if( b_aseek )
- {
- const int64_t i_pos_wanted = p_sys->i_pos + i_read;
-
- if( AStreamSeekStream( s, i_pos_wanted ) )
- {
- if( p_sys->i_pos != i_pos_wanted )
- return 0;
- }
- return i_read;
- }
- }
-
-#ifdef STREAM_DEBUG
- msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64
- " offset=%d end=%"PRId64,
- i_read, p_sys->i_pos, p_sys->stream.i_tk,
- tk->i_start, p_sys->stream.i_offset, tk->i_end );
-#endif
- while( i_data < i_read )
+ if( !p_read )
{
- int i_off = (tk->i_start + p_sys->stream.i_offset) %
- STREAM_CACHE_TRACK_SIZE;
- unsigned int i_current =
- __MAX(0,__MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
- STREAM_CACHE_TRACK_SIZE - i_off ));
- int i_copy = __MIN( i_current, i_read - i_data );
+ const int64_t i_pos_wanted = p_sys->i_pos + i_read;
- if( i_copy <= 0 ) break; /* EOF */
-
- /* Copy data */
- /* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
- if( p_data )
+ if( AStreamSeekStream( s, i_pos_wanted ) )
{
- memcpy( p_data, &tk->p_buffer[i_off], i_copy );
- p_data += i_copy;
- }
- i_data += i_copy;
- p_sys->stream.i_offset += i_copy;
-
- /* Update pos now */
- p_sys->i_pos += i_copy;
-
- /* */
- p_sys->stream.i_used += i_copy;
-
- if( tk->i_end - tk->i_start - p_sys->stream.i_offset <= i_read -i_data )
- {
- const int i_read_requested = __MAX( __MIN( i_read - i_data,
- STREAM_READ_ATONCE * 10 ),
- STREAM_READ_ATONCE / 2 );
-
- if( p_sys->stream.i_used < i_read_requested )
- p_sys->stream.i_used = i_read_requested;
-
- if( AStreamRefillStream( s ) )
- {
- /* EOF */
- if( tk->i_start >= tk->i_end ) break;
- }
+ if( p_sys->i_pos != i_pos_wanted )
+ return 0;
}
+ return i_read;
}
-
- return i_data;
+ return AStreamReadNoSeekStream( s, p_read, i_read );
}
static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
static int AStreamSeekStream( stream_t *s, int64_t i_pos )
{
stream_sys_t *p_sys = s->p_sys;
- access_t *p_access = p_sys->p_access;
- bool b_aseek;
- bool b_afastseek;
- int i_maxth;
- int i_new;
- int i;
+
+ stream_track_t *p_current = &p_sys->stream.tk[p_sys->stream.i_tk];
+ access_t *p_access = p_sys->p_access;
+
+ if( p_current->i_start >= p_current->i_end && i_pos >= p_current->i_end )
+ return 0; /* EOF */
#ifdef STREAM_DEBUG
msg_Dbg( s, "AStreamSeekStream: to %"PRId64" pos=%"PRId64
" tk=%d start=%"PRId64" offset=%d end=%"PRId64,
i_pos, p_sys->i_pos, p_sys->stream.i_tk,
- p_sys->stream.tk[p_sys->stream.i_tk].i_start,
+ p_current->i_start,
p_sys->stream.i_offset,
- p_sys->stream.tk[p_sys->stream.i_tk].i_end );
-#endif
-
-
- /* Seek in our current track ? */
- if( i_pos >= p_sys->stream.tk[p_sys->stream.i_tk].i_start &&
- i_pos < p_sys->stream.tk[p_sys->stream.i_tk].i_end )
- {
- stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
-#ifdef STREAM_DEBUG
- msg_Dbg( s, "AStreamSeekStream: current track" );
+ p_current->i_end );
#endif
- p_sys->i_pos = i_pos;
- p_sys->stream.i_offset = i_pos - tk->i_start;
-
- /* If there is not enough data left in the track, refill */
- /* \todo How to get a correct value for
- * - refilling threshold
- * - how much to refill
- */
- if( (tk->i_end - tk->i_start ) - p_sys->stream.i_offset <
- p_sys->stream.i_read_size )
- {
- if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
- {
- p_sys->stream.i_used = STREAM_READ_ATONCE / 2 ;
- AStreamRefillStream( s );
- }
- }
- return VLC_SUCCESS;
- }
+ bool b_aseek;
access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
- if( !b_aseek )
+ if( !b_aseek && i_pos < p_current->i_start )
{
- /* We can't do nothing */
- msg_Dbg( s, "AStreamSeekStream: can't seek" );
+ msg_Warn( s, "AStreamSeekStream: can't seek" );
return VLC_EGENERIC;
}
- /* Date the current track */
- p_sys->stream.tk[p_sys->stream.i_tk].i_date = mdate();
+ bool b_afastseek;
+ access_Control( p_access, ACCESS_CAN_SEEK, &b_afastseek );
- /* Try to reuse already read data */
- for( i = 0; i < STREAM_CACHE_TRACK; i++ )
- {
- stream_track_t *tk = &p_sys->stream.tk[i];
+ /* FIXME compute seek cost (instead of static 'stupid' value) */
+ int64_t i_skip_threshold;
+ if( b_aseek )
+ i_skip_threshold = b_afastseek ? 128 : 3*p_sys->stream.i_read_size;
+ else
+ i_skip_threshold = INT64_MAX;
- if( i_pos >= tk->i_start && i_pos <= tk->i_end )
- {
-#ifdef STREAM_DEBUG
- msg_Dbg( s, "AStreamSeekStream: reusing %d start=%"PRId64
- " end=%"PRId64, i, tk->i_start, tk->i_end );
-#endif
+ /* Date the current track */
+ p_current->i_date = mdate();
- /* Seek at the end of the buffer */
- if( ASeek( s, tk->i_end ) ) return VLC_EGENERIC;
+ /* Search a new track slot */
+ stream_track_t *tk = NULL;
+ int i_tk_idx = -1;
- /* That's it */
- p_sys->i_pos = i_pos;
- p_sys->stream.i_tk = i;
- p_sys->stream.i_offset = i_pos - tk->i_start;
+ /* Prefer the current track */
+ if( p_current->i_start <= i_pos && i_pos - p_current->i_end <= i_skip_threshold )
+ {
+ tk = p_current;
+ i_tk_idx = p_sys->stream.i_tk;
+ }
+ if( !tk )
+ {
+ /* Try to maximize already read data */
+ for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
+ {
+ stream_track_t *t = &p_sys->stream.tk[i];
- if( p_sys->stream.i_used < STREAM_READ_ATONCE )
- p_sys->stream.i_used = STREAM_READ_ATONCE;
+ if( t->i_start > i_pos || i_pos > t->i_end )
+ continue;
- if( AStreamRefillStream( s ) && i_pos == tk->i_end )
- return VLC_EGENERIC;
+ if( !tk || tk->i_end < t->i_end )
+ {
+ tk = t;
+ i_tk_idx = i;
+ }
+ }
+ }
+ if( !tk )
+ {
+ /* Use the oldest unused */
+ for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
+ {
+ stream_track_t *t = &p_sys->stream.tk[i];
- return VLC_SUCCESS;
+ if( !tk || tk->i_date > t->i_date )
+ {
+ tk = t;
+ i_tk_idx = i;
+ }
}
}
+ assert( i_tk_idx >= 0 && i_tk_idx < STREAM_CACHE_TRACK );
- access_Control( p_access, ACCESS_CAN_SEEK, &b_afastseek );
- /* FIXME compute seek cost (instead of static 'stupid' value) */
- i_maxth = __MIN( p_sys->stream.i_read_size, STREAM_READ_ATONCE / 2 );
- if( !b_afastseek )
- i_maxth *= 3;
-
- /* FIXME TODO */
-#if 0
- /* Search closest segment TODO */
- for( i = 0; i < STREAM_CACHE_TRACK; i++ )
+ if( tk != p_current )
+ i_skip_threshold = 0;
+ if( tk->i_start <= i_pos && i_pos - tk->i_end <= i_skip_threshold )
{
- stream_track_t *tk = &p_sys->stream.tk[i];
-
- if( i_pos + i_maxth >= tk->i_start )
+#ifdef STREAM_DEBUG
+ msg_Err( s, "AStreamSeekStream: reusing %d start=%"PRId64
+ " end=%"PRId64"(%s)",
+ i_tk_idx, tk->i_start, tk->i_end,
+ tk != p_current ? "seek" : i_pos > tk->i_end ? "skip" : "noseek" );
+#endif
+ if( tk != p_current )
{
- msg_Dbg( s, "good segment before current pos, TODO" );
+ assert( b_aseek );
+
+ /* Seek at the end of the buffer
+ * TODO it is stupid to seek now, it would be better to delay it
+ */
+ if( ASeek( s, tk->i_end ) )
+ return VLC_EGENERIC;
}
- if( i_pos - i_maxth <= tk->i_end )
+ else
{
- msg_Dbg( s, "good segment after current pos, TODO" );
+ int64_t i_skip = i_pos - tk->i_end;
+ while( i_skip > 0 )
+ {
+ const int i_read_max = __MIN( 10 * STREAM_READ_ATONCE, i_skip );
+ if( AStreamReadNoSeekStream( s, NULL, i_read_max ) != i_read_max )
+ return VLC_EGENERIC;
+ i_skip -= i_read_max;
+ }
}
}
+ else
+ {
+#ifdef STREAM_DEBUG
+ msg_Err( s, "AStreamSeekStream: hard seek" );
#endif
+ /* Nothing good, seek and choose oldest segment */
+ if( ASeek( s, i_pos ) )
+ return VLC_EGENERIC;
- /* Nothing good, seek and choose oldest segment */
- if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
+ tk->i_start = i_pos;
+ tk->i_end = i_pos;
+ }
+ p_sys->stream.i_offset = i_pos - tk->i_start;
+ p_sys->stream.i_tk = i_tk_idx;
p_sys->i_pos = i_pos;
- i_new = 0;
- for( i = 1; i < STREAM_CACHE_TRACK; i++ )
+ /* If there is not enough data left in the track, refill */
+ /* TODO How to get a correct value for
+ * - refilling threshold
+ * - how much to refill
+ */
+ if( (tk->i_end - tk->i_start) - p_sys->stream.i_offset < p_sys->stream.i_read_size )
{
- if( p_sys->stream.tk[i].i_date < p_sys->stream.tk[i_new].i_date )
- i_new = i;
+ if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
+ p_sys->stream.i_used = STREAM_READ_ATONCE / 2;
+
+ if( AStreamRefillStream( s ) && i_pos == tk->i_end )
+ return VLC_EGENERIC;
}
+ return VLC_SUCCESS;
+}
- /* Reset the segment */
- p_sys->stream.i_tk = i_new;
- p_sys->stream.i_offset = 0;
- p_sys->stream.tk[i_new].i_start = i_pos;
- p_sys->stream.tk[i_new].i_end = i_pos;
+static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
- /* Read data */
- if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
- p_sys->stream.i_used = STREAM_READ_ATONCE / 2;
+ uint8_t *p_data = (uint8_t *)p_read;
+ unsigned int i_data = 0;
- if( AStreamRefillStream( s ) )
- return VLC_EGENERIC;
+ if( tk->i_start >= tk->i_end )
+ return 0; /* EOF */
- return VLC_SUCCESS;
+#ifdef STREAM_DEBUG
+ msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64
+ " offset=%d end=%"PRId64,
+ i_read, p_sys->i_pos, p_sys->stream.i_tk,
+ tk->i_start, p_sys->stream.i_offset, tk->i_end );
+#endif
+
+ while( i_data < i_read )
+ {
+ int i_off = (tk->i_start + p_sys->stream.i_offset) %
+ STREAM_CACHE_TRACK_SIZE;
+ unsigned int i_current =
+ __MAX(0,__MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
+ STREAM_CACHE_TRACK_SIZE - i_off ));
+ int i_copy = __MIN( i_current, i_read - i_data );
+
+ if( i_copy <= 0 ) break; /* EOF */
+
+ /* Copy data */
+ /* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
+ if( p_data )
+ {
+ memcpy( p_data, &tk->p_buffer[i_off], i_copy );
+ p_data += i_copy;
+ }
+ i_data += i_copy;
+ p_sys->stream.i_offset += i_copy;
+
+ /* Update pos now */
+ p_sys->i_pos += i_copy;
+
+ /* */
+ p_sys->stream.i_used += i_copy;
+
+ if( tk->i_end - tk->i_start - p_sys->stream.i_offset <= i_read -i_data )
+ {
+ const int i_read_requested = __MAX( __MIN( i_read - i_data,
+ STREAM_READ_ATONCE * 10 ),
+ STREAM_READ_ATONCE / 2 );
+
+ if( p_sys->stream.i_used < i_read_requested )
+ p_sys->stream.i_used = i_read_requested;
+
+ if( AStreamRefillStream( s ) )
+ {
+ /* EOF */
+ if( tk->i_start >= tk->i_end ) break;
+ }
+ }
+ }
+
+ return i_data;
}
+
static int AStreamRefillStream( stream_t *s )
{
stream_sys_t *p_sys = s->p_sys;
projects / vlc / commitdiff