/*****************************************************************************
* stream.c
*****************************************************************************
- * Copyright (C) 1999-2001 VideoLAN
- * $Id: stream.c,v 1.3 2003/08/18 19:17:54 fenrir Exp $
+ * Copyright (C) 1999-2004 the VideoLAN team
+ * $Id$
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
-#include <stdlib.h>
-#include <vlc/vlc.h>
-#include <vlc/input.h>
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
-#include "ninput.h"
+#include <dirent.h>
+#include <assert.h>
-/****************************************************************************
- * stream_* :
- * XXX for now it's just a wrapper
- *
- ****************************************************************************/
+#include <vlc_common.h>
+#include <vlc_strings.h>
+#include <vlc_memory.h>
-/**
- * Handle to a stream.
+#include <libvlc.h>
+
+#include "access.h"
+#include "stream.h"
+
+#include "input_internal.h"
+
+// #define STREAM_DEBUG 1
+
+/* TODO:
+ * - tune the 2 methods (block/stream)
+ * - compute cost for seek
+ * - improve stream mode seeking with closest segments
+ * - ...
*/
-struct stream_t
-{
- VLC_COMMON_MEMBERS
- /** pointer to the input thread */
- input_thread_t *p_input;
+/* Two methods:
+ * - using pf_block
+ * One linked list of data read
+ * - using pf_read
+ * More complex scheme using mutliple track to avoid seeking
+ * - using directly the access (only indirection for peeking).
+ * This method is known to introduce much less latency.
+ * It should probably defaulted (instead of the stream method (2)).
+ */
-};
+/* How many tracks we have, currently only used for stream mode */
+#ifdef OPTIMIZE_MEMORY
+# define STREAM_CACHE_TRACK 1
+ /* Max size of our cache 128Ko per track */
+# define STREAM_CACHE_SIZE (STREAM_CACHE_TRACK*1024*128)
+#else
+# define STREAM_CACHE_TRACK 3
+ /* Max size of our cache 4Mo per track */
+# define STREAM_CACHE_SIZE (4*STREAM_CACHE_TRACK*1024*1024)
+#endif
-/**
- * Create a "stream_t *" from an "input_thread_t *".
+/* How many data we try to prebuffer
+ * XXX it should be small to avoid useless latency but big enough for
+ * efficient demux probing */
+#define STREAM_CACHE_PREBUFFER_SIZE (128)
+
+/* Method1: Simple, for pf_block.
+ * We get blocks and put them in the linked list.
+ * We release blocks once the total size is bigger than CACHE_BLOCK_SIZE
+ */
+
+/* Method2: A bit more complex, for pf_read
+ * - We use ring buffers, only one if unseekable, all if seekable
+ * - Upon seek date current ring, then search if one ring match the pos,
+ * yes: switch to it, seek the access to match the end of the ring
+ * no: search the ring with i_end the closer to i_pos,
+ * if close enough, read data and use this ring
+ * else use the oldest ring, seek and use it.
+ *
+ * TODO: - with access non seekable: use all space available for only one ring, but
+ * we have to support seekable/non-seekable switch on the fly.
+ * - compute a good value for i_read_size
+ * - ?
*/
-stream_t *stream_OpenInput( input_thread_t *p_input )
+#define STREAM_READ_ATONCE 1024
+#define STREAM_CACHE_TRACK_SIZE (STREAM_CACHE_SIZE/STREAM_CACHE_TRACK)
+
+typedef struct
{
- stream_t *s;
+ int64_t i_date;
- s = vlc_object_create( p_input, sizeof( stream_t ) );
- if( s )
- {
- s->p_input = p_input;
- }
+ uint64_t i_start;
+ uint64_t i_end;
- return s;
-}
+ uint8_t *p_buffer;
-/**
- * Destroy a previously created "stream_t *" instance.
- */
-void stream_Release( stream_t *s )
+} stream_track_t;
+
+typedef struct
{
- vlc_object_destroy( s );
-}
+ char *psz_path;
+ uint64_t i_size;
-/**
- * Similar to #stream_Control(), but takes a va_list and not variable arguments.
- */
-int stream_vaControl( stream_t *s, int i_query, va_list args )
+} access_entry_t;
+
+typedef enum
{
- vlc_bool_t *p_b;
- int64_t *p_i64, i64;
+ STREAM_METHOD_BLOCK,
+ STREAM_METHOD_STREAM
+} stream_read_method_t;
- switch( i_query )
+struct stream_sys_t
+{
+ access_t *p_access;
+
+ stream_read_method_t method; /* method to use */
+
+ uint64_t i_pos; /* Current reading offset */
+
+ /* Method 1: pf_block */
+ struct
{
- case STREAM_GET_SIZE:
- p_i64 = (int64_t*) va_arg( args, int64_t * );
+ uint64_t i_start; /* Offset of block for p_first */
+ uint64_t i_offset; /* Offset for data in p_current */
+ block_t *p_current; /* Current block */
- vlc_mutex_lock( &s->p_input->stream.stream_lock );
- *p_i64 = s->p_input->stream.p_selected_area->i_size;
- vlc_mutex_unlock( &s->p_input->stream.stream_lock );
- return VLC_SUCCESS;
+ uint64_t i_size; /* Total amount of data in the list */
+ block_t *p_first;
+ block_t **pp_last;
- case STREAM_CAN_SEEK:
- p_b = (vlc_bool_t*) va_arg( args, vlc_bool_t * );
+ } block;
- vlc_mutex_lock( &s->p_input->stream.stream_lock );
- *p_b = s->p_input->stream.b_seekable;
- vlc_mutex_unlock( &s->p_input->stream.stream_lock );
- return VLC_SUCCESS;
+ /* Method 2: for pf_read */
+ struct
+ {
+ unsigned i_offset; /* Buffer offset in the current track */
+ int i_tk; /* Current track */
+ stream_track_t tk[STREAM_CACHE_TRACK];
- case STREAM_CAN_FASTSEEK:
- p_b = (vlc_bool_t*) va_arg( args, vlc_bool_t * );
+ /* Global buffer */
+ uint8_t *p_buffer;
- vlc_mutex_lock( &s->p_input->stream.stream_lock );
- *p_b = s->p_input->stream.b_seekable && s->p_input->stream.i_method == INPUT_METHOD_FILE;
- vlc_mutex_unlock( &s->p_input->stream.stream_lock );
- return VLC_SUCCESS;
+ /* */
+ unsigned i_used; /* Used since last read */
+ unsigned i_read_size;
- case STREAM_GET_POSITION:
- p_i64 = (int64_t*) va_arg( args, int64_t * );
+ } stream;
- vlc_mutex_lock( &s->p_input->stream.stream_lock );
- *p_i64 = s->p_input->stream.p_selected_area->i_tell;
- vlc_mutex_unlock( &s->p_input->stream.stream_lock );
- return VLC_SUCCESS;
+ /* Peek temporary buffer */
+ unsigned int i_peek;
+ uint8_t *p_peek;
- case STREAM_SET_POSITION:
- i64 = (int64_t) va_arg( args, int64_t );
+ /* Stat for both method */
+ struct
+ {
+ bool b_fastseek; /* From access */
- vlc_mutex_lock( &s->p_input->stream.stream_lock );
- if( i64 < 0 ||
- ( s->p_input->stream.p_selected_area->i_size > 0 &&
- s->p_input->stream.p_selected_area->i_size < i64 ) )
- {
- vlc_mutex_unlock( &s->p_input->stream.stream_lock );
- msg_Err( s, "seek out of bound" );
- return VLC_EGENERIC;
- }
- vlc_mutex_unlock( &s->p_input->stream.stream_lock );
+ /* Stat about reading data */
+ uint64_t i_read_count;
+ uint64_t i_bytes;
+ uint64_t i_read_time;
- if( i64 == s->p_input->stream.p_selected_area->i_tell )
- {
- return VLC_SUCCESS;
- }
+ /* Stat about seek */
+ unsigned i_seek_count;
+ uint64_t i_seek_time;
- if( s->p_input->stream.b_seekable &&
- ( s->p_input->stream.i_method == INPUT_METHOD_FILE ||
- i64 - s->p_input->stream.p_selected_area->i_tell < 0 ||
- i64 - s->p_input->stream.p_selected_area->i_tell > 4096 ) )
- {
- input_AccessReinit( s->p_input );
- s->p_input->pf_seek( s->p_input, i64 );
- return VLC_SUCCESS;
- }
+ } stat;
- if( i64 - s->p_input->stream.p_selected_area->i_tell > 0 )
- {
- data_packet_t *p_data;
- int i_skip = i64 - s->p_input->stream.p_selected_area->i_tell;
+ /* Streams list */
+ int i_list;
+ access_entry_t **list;
+ int i_list_index;
+ access_t *p_list_access;
+};
- msg_Warn( s, "will skip %d bytes, slow", i_skip );
+/* Method 1: */
+static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read );
+static int AStreamPeekBlock( stream_t *s, const uint8_t **p_peek, unsigned int i_read );
+static int AStreamSeekBlock( stream_t *s, uint64_t i_pos );
+static void AStreamPrebufferBlock( stream_t *s );
+static block_t *AReadBlock( stream_t *s, bool *pb_eof );
- while (i_skip > 0 )
- {
- int i_read;
+/* Method 2 */
+static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read );
+static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read );
+static int AStreamSeekStream( stream_t *s, uint64_t i_pos );
+static void AStreamPrebufferStream( stream_t *s );
+static int AReadStream( stream_t *s, void *p_read, unsigned int i_read );
- i_read = input_SplitBuffer( s->p_input, &p_data,
- __MIN( (int)s->p_input->i_bufsize, i_skip ) );
- if( i_read < 0 )
- {
- return VLC_EGENERIC;
- }
- i_skip -= i_read;
+/* Common */
+static int AStreamControl( stream_t *s, int i_query, va_list );
+static void AStreamDestroy( stream_t *s );
+static void UStreamDestroy( stream_t *s );
+static int ASeek( stream_t *s, uint64_t i_pos );
- input_DeletePacket( s->p_input->p_method_data, p_data );
- if( i_read == 0 && i_skip > 0 )
- {
- return VLC_EGENERIC;
- }
- }
- }
+/****************************************************************************
+ * stream_CommonNew: create an empty stream structure
+ ****************************************************************************/
+stream_t *stream_CommonNew( vlc_object_t *p_obj )
+{
+ stream_t *s = (stream_t *)vlc_custom_create( p_obj, sizeof(*s),
+ VLC_OBJECT_GENERIC, "stream" );
- return VLC_SUCCESS;
+ if( !s )
+ return NULL;
- default:
- msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
- return VLC_EGENERIC;
+ s->p_text = malloc( sizeof(*s->p_text) );
+ if( !s->p_text )
+ {
+ vlc_object_release( s );
+ return NULL;
}
+
+ /* UTF16 and UTF32 text file conversion */
+ s->p_text->conv = (vlc_iconv_t)(-1);
+ s->p_text->i_char_width = 1;
+ s->p_text->b_little_endian = false;
+
+ return s;
}
-/**
- * Use to control the "stream_t *". Look at #stream_query_e for
- * possible "i_query" value and format arguments. Return VLC_SUCCESS
- * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
- */
-int stream_Control( stream_t *s, int i_query, ... )
+void stream_CommonDelete( stream_t *s )
{
- va_list args;
- int i_result;
+ if( s->p_text )
+ {
+ if( s->p_text->conv != (vlc_iconv_t)(-1) )
+ vlc_iconv_close( s->p_text->conv );
+ free( s->p_text );
+ }
+ free( s->psz_path );
+ vlc_object_release( s );
+}
- va_start( args, i_query );
- i_result = stream_vaControl( s, i_query, args );
- va_end( args );
+#undef stream_UrlNew
+/****************************************************************************
+ * stream_UrlNew: create a stream from a access
+ ****************************************************************************/
+stream_t *stream_UrlNew( vlc_object_t *p_parent, const char *psz_url )
+{
+ const char *psz_access, *psz_demux;
+ char *psz_path;
+ access_t *p_access;
+ stream_t *p_res;
- return i_result;
+ if( !psz_url )
+ return NULL;
+
+ char psz_dup[strlen( psz_url ) + 1];
+ strcpy( psz_dup, psz_url );
+ input_SplitMRL( &psz_access, &psz_demux, &psz_path, psz_dup );
+
+ /* Get a weak link to the parent input */
+ /* FIXME: This should probably be removed in favor of a NULL input. */
+ input_thread_t *p_input = (input_thread_t *)vlc_object_find( p_parent, VLC_OBJECT_INPUT, FIND_PARENT );
+
+ /* Now try a real access */
+ p_access = access_New( p_parent, p_input, psz_access, psz_demux, psz_path );
+
+ if(p_input)
+ vlc_object_release((vlc_object_t*)p_input);
+
+ if( p_access == NULL )
+ {
+ msg_Err( p_parent, "no suitable access module for `%s'", psz_url );
+ return NULL;
+ }
+
+ if( !( p_res = stream_AccessNew( p_access, NULL ) ) )
+ {
+ access_Delete( p_access );
+ return NULL;
+ }
+
+ p_res->pf_destroy = UStreamDestroy;
+ return p_res;
}
-/**
- * Try to read "i_read" bytes into a buffer pointed by "p_read". If
- * "p_read" is NULL then data are skipped instead of read. The return
- * value is the real numbers of bytes read/skip. If this value is less
- * than i_read that means that it's the end of the stream.
- */
-int stream_Read( stream_t *s, void *p_data, int i_data )
+stream_t *stream_AccessNew( access_t *p_access, char **ppsz_list )
{
- uint8_t *p = (uint8_t*)p_data;
- data_packet_t *p_packet;
+ stream_t *s = stream_CommonNew( VLC_OBJECT(p_access) );
+ stream_sys_t *p_sys;
- int i_read = 0;
+ if( !s )
+ return NULL;
- if( p_data == NULL && i_data > 0 )
+ s->p_input = p_access->p_input;
+ s->psz_path = strdup( p_access->psz_location );
+ s->p_sys = p_sys = malloc( sizeof( *p_sys ) );
+ if( !s->psz_path || !s->p_sys )
{
- int64_t i_pos;
+ stream_CommonDelete( s );
+ return NULL;
+ }
- stream_Control( s, STREAM_GET_POSITION, &i_pos );
+ /* Attach it now, needed for b_die */
+ vlc_object_attach( s, p_access );
- i_pos += i_data;
- if( stream_Control( s, STREAM_SET_POSITION, i_pos ) )
+ s->pf_read = NULL; /* Set up later */
+ s->pf_peek = NULL;
+ s->pf_control = AStreamControl;
+ s->pf_destroy = AStreamDestroy;
+
+ /* Common field */
+ p_sys->p_access = p_access;
+ if( p_access->pf_block )
+ p_sys->method = STREAM_METHOD_BLOCK;
+ else
+ p_sys->method = STREAM_METHOD_STREAM;
+
+ p_sys->i_pos = p_access->info.i_pos;
+
+ /* Stats */
+ access_Control( p_access, ACCESS_CAN_FASTSEEK, &p_sys->stat.b_fastseek );
+ p_sys->stat.i_bytes = 0;
+ p_sys->stat.i_read_time = 0;
+ p_sys->stat.i_read_count = 0;
+ p_sys->stat.i_seek_count = 0;
+ p_sys->stat.i_seek_time = 0;
+
+ TAB_INIT( p_sys->i_list, p_sys->list );
+ p_sys->i_list_index = 0;
+ p_sys->p_list_access = NULL;
+
+ /* Get the additional list of inputs if any (for concatenation) */
+ if( ppsz_list && ppsz_list[0] )
+ {
+ access_entry_t *p_entry = malloc( sizeof(*p_entry) );
+ if( !p_entry )
+ goto error;
+
+ p_entry->i_size = p_access->info.i_size;
+ p_entry->psz_path = strdup( p_access->psz_location );
+ if( !p_entry->psz_path )
{
- return 0;
+ free( p_entry );
+ goto error;
+ }
+ p_sys->p_list_access = p_access;
+ TAB_APPEND( p_sys->i_list, p_sys->list, p_entry );
+ msg_Dbg( p_access, "adding file `%s', (%"PRId64" bytes)",
+ p_entry->psz_path, p_access->info.i_size );
+
+ for( int i = 0; ppsz_list[i] != NULL; i++ )
+ {
+ char *psz_name = strdup( ppsz_list[i] );
+
+ if( !psz_name )
+ break;
+
+ access_t *p_tmp = access_New( p_access, p_access->p_input,
+ p_access->psz_access, "", psz_name );
+ if( !p_tmp )
+ continue;
+
+ msg_Dbg( p_access, "adding file `%s', (%"PRId64" bytes)",
+ psz_name, p_tmp->info.i_size );
+
+ p_entry = malloc( sizeof(*p_entry) );
+ if( p_entry )
+ {
+ p_entry->i_size = p_tmp->info.i_size;
+ p_entry->psz_path = psz_name;
+ TAB_APPEND( p_sys->i_list, p_sys->list, p_entry );
+ }
+ access_Delete( p_tmp );
}
- return i_data;
}
- while( i_data > 0 && !s->p_input->b_die )
+ /* Peek */
+ p_sys->i_peek = 0;
+ p_sys->p_peek = NULL;
+
+ if( p_sys->method == STREAM_METHOD_BLOCK )
{
- int i_count;
+ msg_Dbg( s, "Using AStream*Block" );
+ s->pf_read = AStreamReadBlock;
+ s->pf_peek = AStreamPeekBlock;
+
+ /* Init all fields of p_sys->block */
+ p_sys->block.i_start = p_sys->i_pos;
+ p_sys->block.i_offset = 0;
+ p_sys->block.p_current = NULL;
+ p_sys->block.i_size = 0;
+ p_sys->block.p_first = NULL;
+ p_sys->block.pp_last = &p_sys->block.p_first;
+
+ /* Do the prebuffering */
+ AStreamPrebufferBlock( s );
- i_count = input_SplitBuffer( s->p_input, &p_packet,
- __MIN( i_data, (int)s->p_input->i_bufsize ) );
- if( i_count <= 0 )
+ if( p_sys->block.i_size <= 0 )
{
- return i_read;
+ msg_Err( s, "cannot pre fill buffer" );
+ goto error;
}
+ }
+ else
+ {
+ int i;
+
+ assert( p_sys->method == STREAM_METHOD_STREAM );
+
+ msg_Dbg( s, "Using AStream*Stream" );
- if( p )
+ s->pf_read = AStreamReadStream;
+ s->pf_peek = AStreamPeekStream;
+
+ /* Allocate/Setup our tracks */
+ p_sys->stream.i_offset = 0;
+ p_sys->stream.i_tk = 0;
+ p_sys->stream.p_buffer = malloc( STREAM_CACHE_SIZE );
+ if( p_sys->stream.p_buffer == NULL )
+ goto error;
+ p_sys->stream.i_used = 0;
+ p_sys->stream.i_read_size = STREAM_READ_ATONCE;
+#if STREAM_READ_ATONCE < 256
+# error "Invalid STREAM_READ_ATONCE value"
+#endif
+
+ for( i = 0; i < STREAM_CACHE_TRACK; i++ )
{
- memcpy( p, p_packet->p_payload_start, i_count );
- p += i_count;
+ p_sys->stream.tk[i].i_date = 0;
+ p_sys->stream.tk[i].i_start = p_sys->i_pos;
+ p_sys->stream.tk[i].i_end = p_sys->i_pos;
+ p_sys->stream.tk[i].p_buffer=
+ &p_sys->stream.p_buffer[i * STREAM_CACHE_TRACK_SIZE];
}
- input_DeletePacket( s->p_input->p_method_data, p_packet );
+ /* Do the prebuffering */
+ AStreamPrebufferStream( s );
- i_data -= i_count;
- i_read += i_count;
+ if( p_sys->stream.tk[p_sys->stream.i_tk].i_end <= 0 )
+ {
+ msg_Err( s, "cannot pre fill buffer" );
+ goto error;
+ }
}
- return i_read;
-}
+ return s;
-/**
- * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
- * The return value is the real numbers of valid bytes, if it's less
- * or equal to 0, *pp_peek is invalid. XXX: it's a pointer to
- * internal buffer and it will be invalid as soons as other stream_*
- * functions are called. be 0 (then *pp_peek isn't valid). XXX: due
- * to input limitation, it could be less than i_peek without meaning
- * the end of the stream (but only when you have i_peek >=
- * p_input->i_bufsize)
- */
-int stream_Peek( stream_t *s, uint8_t **pp_peek, int i_data )
-{
- return input_Peek( s->p_input, pp_peek, i_data );
+error:
+ if( p_sys->method == STREAM_METHOD_BLOCK )
+ {
+ /* Nothing yet */
+ }
+ else
+ {
+ free( p_sys->stream.p_buffer );
+ }
+ while( p_sys->i_list > 0 )
+ free( p_sys->list[--(p_sys->i_list)] );
+ free( p_sys->list );
+ free( s->p_sys );
+ stream_CommonDelete( s );
+ return NULL;
}
-/**
- * Read "i_size" bytes and store them in a pes_packet_t. Only fields
- * p_first, p_last, i_nb_data, and i_pes_size are set. (Of course,
- * you need to fill i_dts, i_pts, ... ) If only less than "i_size"
- * bytes are available NULL is returned.
- */
-pes_packet_t *stream_PesPacket( stream_t *s, int i_data )
+/****************************************************************************
+ * AStreamDestroy:
+ ****************************************************************************/
+static void AStreamDestroy( stream_t *s )
{
- pes_packet_t *p_pes;
- data_packet_t *p_packet;
+ stream_sys_t *p_sys = s->p_sys;
+
+ if( p_sys->method == STREAM_METHOD_BLOCK )
+ block_ChainRelease( p_sys->block.p_first );
+ else
+ free( p_sys->stream.p_buffer );
+ free( p_sys->p_peek );
- if( !(p_pes = input_NewPES( s->p_input->p_method_data ) ) )
+ if( p_sys->p_list_access && p_sys->p_list_access != p_sys->p_access )
+ access_Delete( p_sys->p_list_access );
+
+ while( p_sys->i_list-- )
{
- return NULL;
+ free( p_sys->list[p_sys->i_list]->psz_path );
+ free( p_sys->list[p_sys->i_list] );
}
- if( i_data <= 0 )
+ free( p_sys->list );
+ free( p_sys );
+
+ stream_CommonDelete( s );
+}
+
+static void UStreamDestroy( stream_t *s )
+{
+ access_t *p_access = (access_t *)s->p_parent;
+ AStreamDestroy( s );
+ access_Delete( p_access );
+}
+
+/****************************************************************************
+ * AStreamControlReset:
+ ****************************************************************************/
+static void AStreamControlReset( stream_t *s )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ p_sys->i_pos = p_sys->p_access->info.i_pos;
+
+ if( p_sys->method == STREAM_METHOD_BLOCK )
{
- p_pes->p_first =
- p_pes->p_last =
- input_NewPacket( s->p_input->p_method_data, 0 );
- p_pes->i_nb_data = 1;
- return p_pes;
- }
+ block_ChainRelease( p_sys->block.p_first );
- while( i_data > 0 )
+ /* Init all fields of p_sys->block */
+ p_sys->block.i_start = p_sys->i_pos;
+ p_sys->block.i_offset = 0;
+ p_sys->block.p_current = NULL;
+ p_sys->block.i_size = 0;
+ p_sys->block.p_first = NULL;
+ p_sys->block.pp_last = &p_sys->block.p_first;
+
+ /* Do the prebuffering */
+ AStreamPrebufferBlock( s );
+ }
+ else
{
- int i_read;
+ int i;
+
+ assert( p_sys->method == STREAM_METHOD_STREAM );
- i_read = input_SplitBuffer( s->p_input, &p_packet,
- __MIN( i_data, (int)s->p_input->i_bufsize ) );
- if( i_read <= 0 )
+ /* Setup our tracks */
+ p_sys->stream.i_offset = 0;
+ p_sys->stream.i_tk = 0;
+ p_sys->stream.i_used = 0;
+
+ for( i = 0; i < STREAM_CACHE_TRACK; i++ )
{
- /* should occur only with EOF and max allocation reached
- * it safer to return an error */
- /* free pes */
- input_DeletePES( s->p_input->p_method_data, p_pes );
- return NULL;
+ p_sys->stream.tk[i].i_date = 0;
+ p_sys->stream.tk[i].i_start = p_sys->i_pos;
+ p_sys->stream.tk[i].i_end = p_sys->i_pos;
}
- if( p_pes->p_first == NULL )
+ /* Do the prebuffering */
+ AStreamPrebufferStream( s );
+ }
+}
+
+/****************************************************************************
+ * AStreamControlUpdate:
+ ****************************************************************************/
+static void AStreamControlUpdate( stream_t *s )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ p_sys->i_pos = p_sys->p_access->info.i_pos;
+
+ if( p_sys->i_list )
+ {
+ int i;
+ for( i = 0; i < p_sys->i_list_index; i++ )
{
- p_pes->p_first = p_packet;
+ p_sys->i_pos += p_sys->list[i]->i_size;
}
- else
+ }
+}
+
+/****************************************************************************
+ * AStreamControl:
+ ****************************************************************************/
+static int AStreamControl( stream_t *s, int i_query, va_list args )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ access_t *p_access = p_sys->p_access;
+
+ bool *p_bool;
+ uint64_t *pi_64, i_64;
+ int i_int;
+
+ switch( i_query )
+ {
+ case STREAM_GET_SIZE:
+ pi_64 = va_arg( args, uint64_t * );
+ if( s->p_sys->i_list )
+ {
+ int i;
+ *pi_64 = 0;
+ for( i = 0; i < s->p_sys->i_list; i++ )
+ *pi_64 += s->p_sys->list[i]->i_size;
+ break;
+ }
+ *pi_64 = p_access->info.i_size;
+ break;
+
+ case STREAM_CAN_SEEK:
+ p_bool = (bool*)va_arg( args, bool * );
+ access_Control( p_access, ACCESS_CAN_SEEK, p_bool );
+ break;
+
+ case STREAM_CAN_FASTSEEK:
+ p_bool = (bool*)va_arg( args, bool * );
+ access_Control( p_access, ACCESS_CAN_FASTSEEK, p_bool );
+ break;
+
+ case STREAM_GET_POSITION:
+ pi_64 = va_arg( args, uint64_t * );
+ *pi_64 = p_sys->i_pos;
+ break;
+
+ case STREAM_SET_POSITION:
+ i_64 = va_arg( args, uint64_t );
+ switch( p_sys->method )
+ {
+ case STREAM_METHOD_BLOCK:
+ return AStreamSeekBlock( s, i_64 );
+ case STREAM_METHOD_STREAM:
+ return AStreamSeekStream( s, i_64 );
+ default:
+ assert(0);
+ return VLC_EGENERIC;
+ }
+
+ case STREAM_CONTROL_ACCESS:
{
- p_pes->p_last->p_next = p_packet;
+ i_int = (int) va_arg( args, int );
+ if( i_int != ACCESS_SET_PRIVATE_ID_STATE &&
+ i_int != ACCESS_SET_PRIVATE_ID_CA &&
+ i_int != ACCESS_GET_PRIVATE_ID_STATE &&
+ i_int != ACCESS_SET_TITLE &&
+ i_int != ACCESS_SET_SEEKPOINT )
+ {
+ msg_Err( s, "Hey, what are you thinking ?"
+ "DON'T USE STREAM_CONTROL_ACCESS !!!" );
+ return VLC_EGENERIC;
+ }
+ int i_ret = access_vaControl( p_access, i_int, args );
+ if( i_int == ACCESS_SET_TITLE || i_int == ACCESS_SET_SEEKPOINT )
+ AStreamControlReset( s );
+ return i_ret;
}
- p_pes->p_last = p_packet;
- p_pes->i_nb_data++;
- p_pes->i_pes_size += i_read;
- i_data -= i_read;
- }
- return p_pes;
+ case STREAM_UPDATE_SIZE:
+ AStreamControlUpdate( s );
+ return VLC_SUCCESS;
+
+ case STREAM_GET_CONTENT_TYPE:
+ return access_Control( p_access, ACCESS_GET_CONTENT_TYPE,
+ va_arg( args, char ** ) );
+ case STREAM_SET_RECORD_STATE:
+ default:
+ msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
+ return VLC_EGENERIC;
+ }
+ return VLC_SUCCESS;
}
-/**
- * Read i_size into a data_packet_t. If b_force is not set, fewer bytes can
- * be returned. You should always set b_force, unless you know what you are
- * doing.
- */
-data_packet_t *stream_DataPacket( stream_t *s, int i_size, vlc_bool_t b_force )
+/****************************************************************************
+ * Method 1:
+ ****************************************************************************/
+static void AStreamPrebufferBlock( stream_t *s )
{
- data_packet_t *p_pk;
- int i_read;
+ stream_sys_t *p_sys = s->p_sys;
- if( i_size <= 0 )
+ int64_t i_first = 0;
+ int64_t i_start;
+
+ msg_Dbg( s, "pre buffering" );
+ i_start = mdate();
+ for( ;; )
{
- p_pk = input_NewPacket( s->p_input->p_method_data, 0 );
- if( p_pk )
+ const int64_t i_date = mdate();
+ bool b_eof;
+ block_t *b;
+
+ if( s->b_die || p_sys->block.i_size > STREAM_CACHE_PREBUFFER_SIZE )
+ {
+ int64_t i_byterate;
+
+ /* Update stat */
+ p_sys->stat.i_bytes = p_sys->block.i_size;
+ p_sys->stat.i_read_time = i_date - i_start;
+ i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
+ (p_sys->stat.i_read_time + 1);
+
+ msg_Dbg( s, "prebuffering done %"PRId64" bytes in %"PRId64"s - "
+ "%"PRId64" KiB/s",
+ p_sys->stat.i_bytes,
+ p_sys->stat.i_read_time / INT64_C(1000000),
+ i_byterate / 1024 );
+ break;
+ }
+
+ /* Fetch a block */
+ if( ( b = AReadBlock( s, &b_eof ) ) == NULL )
+ {
+ if( b_eof )
+ break;
+ continue;
+ }
+
+ while( b )
+ {
+ /* Append the block */
+ p_sys->block.i_size += b->i_buffer;
+ *p_sys->block.pp_last = b;
+ p_sys->block.pp_last = &b->p_next;
+
+ p_sys->stat.i_read_count++;
+ b = b->p_next;
+ }
+
+ if( i_first == 0 )
{
- p_pk->p_payload_end = p_pk->p_payload_start;
+ i_first = mdate();
+ msg_Dbg( s, "received first data after %d ms",
+ (int)((i_first-i_start)/1000) );
}
- return p_pk;
}
- i_read = input_SplitBuffer( s->p_input, &p_pk, i_size );
- if( i_read <= 0 )
+ p_sys->block.p_current = p_sys->block.p_first;
+}
+
+static int AStreamRefillBlock( stream_t *s );
+
+static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ uint8_t *p_data = p_read;
+ unsigned int i_data = 0;
+
+ /* It means EOF */
+ if( p_sys->block.p_current == NULL )
+ return 0;
+
+ if( p_data == NULL )
{
- return 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 )
+ return AStreamSeekBlock( s, p_sys->i_pos + i_read ) ? 0 : i_read;
}
- /* Should be really rare, near 0 */
- if( i_read < i_size && b_force )
+ while( i_data < i_read )
{
- data_packet_t *p_old = p_pk;
- int i_missing = i_size - i_read;
+ int i_current =
+ p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
+ unsigned int i_copy = __MIN( (unsigned int)__MAX(i_current,0), i_read - i_data);
- p_pk = input_NewPacket( s->p_input->p_method_data, i_size );
- if( p_pk == NULL )
+ /* Copy data */
+ if( p_data )
{
- input_DeletePacket( s->p_input->p_method_data, p_old );
- return NULL;
+ memcpy( p_data,
+ &p_sys->block.p_current->p_buffer[p_sys->block.i_offset],
+ i_copy );
+ p_data += i_copy;
}
- p_pk->p_payload_end = p_pk->p_payload_start + i_size;
- memcpy( p_pk->p_payload_start, p_old->p_payload_start, i_read );
- input_DeletePacket( s->p_input->p_method_data, p_old );
+ i_data += i_copy;
- if( stream_Read( s, &p_pk->p_payload_start[i_read], i_missing ) < i_missing )
+ p_sys->block.i_offset += i_copy;
+ if( p_sys->block.i_offset >= p_sys->block.p_current->i_buffer )
{
- input_DeletePacket( s->p_input->p_method_data, p_pk );
- return NULL;
+ /* Current block is now empty, switch to next */
+ if( p_sys->block.p_current )
+ {
+ p_sys->block.i_offset = 0;
+ p_sys->block.p_current = p_sys->block.p_current->p_next;
+ }
+ /*Get a new block if needed */
+ if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
+ {
+ break;
+ }
}
}
- return p_pk;
+ p_sys->i_pos += i_data;
+ return i_data;
}
+static int AStreamPeekBlock( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ uint8_t *p_data;
+ unsigned int i_data = 0;
+ block_t *b;
+ unsigned int i_offset;
+
+ if( p_sys->block.p_current == NULL ) return 0; /* EOF */
+ /* We can directly give a pointer over our buffer */
+ if( i_read <= p_sys->block.p_current->i_buffer - p_sys->block.i_offset )
+ {
+ *pp_peek = &p_sys->block.p_current->p_buffer[p_sys->block.i_offset];
+ return i_read;
+ }
+ /* We need to create a local copy */
+ if( p_sys->i_peek < i_read )
+ {
+ p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
+ if( !p_sys->p_peek )
+ {
+ p_sys->i_peek = 0;
+ return 0;
+ }
+ p_sys->i_peek = i_read;
+ }
+
+ /* Fill enough data */
+ while( p_sys->block.i_size - (p_sys->i_pos - p_sys->block.i_start)
+ < i_read )
+ {
+ block_t **pp_last = p_sys->block.pp_last;
+
+ if( AStreamRefillBlock( s ) ) break;
+
+ /* Our buffer are probably filled enough, don't try anymore */
+ if( pp_last == p_sys->block.pp_last ) break;
+ }
+
+ /* Copy what we have */
+ b = p_sys->block.p_current;
+ i_offset = p_sys->block.i_offset;
+ p_data = p_sys->p_peek;
+
+ while( b && i_data < i_read )
+ {
+ unsigned int i_current = __MAX(b->i_buffer - i_offset,0);
+ int i_copy = __MIN( i_current, i_read - i_data );
+
+ memcpy( p_data, &b->p_buffer[i_offset], i_copy );
+ i_data += i_copy;
+ p_data += i_copy;
+ i_offset += i_copy;
+
+ if( i_offset >= b->i_buffer )
+ {
+ i_offset = 0;
+ b = b->p_next;
+ }
+ }
+
+ *pp_peek = p_sys->p_peek;
+ return i_data;
+}
+
+static int AStreamSeekBlock( stream_t *s, uint64_t i_pos )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ access_t *p_access = p_sys->p_access;
+ int64_t i_offset = i_pos - p_sys->block.i_start;
+ bool b_seek;
+
+ /* We already have thoses data, just update p_current/i_offset */
+ if( i_offset >= 0 && (uint64_t)i_offset < p_sys->block.i_size )
+ {
+ block_t *b = p_sys->block.p_first;
+ int i_current = 0;
+
+ while( i_current + b->i_buffer < (uint64_t)i_offset )
+ {
+ i_current += b->i_buffer;
+ b = b->p_next;
+ }
+
+ p_sys->block.p_current = b;
+ p_sys->block.i_offset = i_offset - i_current;
+
+ p_sys->i_pos = i_pos;
+
+ return VLC_SUCCESS;
+ }
+
+ /* We may need to seek or to read data */
+ if( i_offset < 0 )
+ {
+ bool b_aseek;
+ access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
+
+ if( !b_aseek )
+ {
+ msg_Err( s, "backward seeking impossible (access not seekable)" );
+ return VLC_EGENERIC;
+ }
+
+ b_seek = true;
+ }
+ else
+ {
+ bool b_aseek, b_aseekfast;
+
+ access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
+ access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_aseekfast );
+
+ if( !b_aseek )
+ {
+ b_seek = false;
+ msg_Warn( s, "%"PRId64" bytes need to be skipped "
+ "(access non seekable)",
+ i_offset - p_sys->block.i_size );
+ }
+ else
+ {
+ int64_t i_skip = i_offset - p_sys->block.i_size;
+
+ /* Avg bytes per packets */
+ int i_avg = p_sys->stat.i_bytes / p_sys->stat.i_read_count;
+ /* TODO compute a seek cost instead of fixed threshold */
+ int i_th = b_aseekfast ? 1 : 5;
+
+ if( i_skip <= i_th * i_avg &&
+ i_skip < STREAM_CACHE_SIZE )
+ b_seek = false;
+ else
+ b_seek = true;
+
+ msg_Dbg( s, "b_seek=%d th*avg=%d skip=%"PRId64,
+ b_seek, i_th*i_avg, i_skip );
+ }
+ }
+
+ if( b_seek )
+ {
+ int64_t i_start, i_end;
+ /* Do the access seek */
+ i_start = mdate();
+ if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
+ i_end = mdate();
+
+ /* Release data */
+ block_ChainRelease( p_sys->block.p_first );
+
+ /* Reinit */
+ p_sys->block.i_start = p_sys->i_pos = i_pos;
+ p_sys->block.i_offset = 0;
+ p_sys->block.p_current = NULL;
+ p_sys->block.i_size = 0;
+ p_sys->block.p_first = NULL;
+ p_sys->block.pp_last = &p_sys->block.p_first;
+
+ /* Refill a block */
+ if( AStreamRefillBlock( s ) )
+ return VLC_EGENERIC;
+
+ /* Update stat */
+ p_sys->stat.i_seek_time += i_end - i_start;
+ p_sys->stat.i_seek_count++;
+ return VLC_SUCCESS;
+ }
+ else
+ {
+ do
+ {
+ while( p_sys->block.p_current &&
+ p_sys->i_pos + p_sys->block.p_current->i_buffer - p_sys->block.i_offset <= i_pos )
+ {
+ p_sys->i_pos += p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
+ p_sys->block.p_current = p_sys->block.p_current->p_next;
+ p_sys->block.i_offset = 0;
+ }
+ if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
+ {
+ if( p_sys->i_pos != i_pos )
+ return VLC_EGENERIC;
+ }
+ }
+ while( p_sys->block.i_start + p_sys->block.i_size < i_pos );
+
+ p_sys->block.i_offset += i_pos - p_sys->i_pos;
+ p_sys->i_pos = i_pos;
+
+ return VLC_SUCCESS;
+ }
+
+ return VLC_EGENERIC;
+}
+
+static int AStreamRefillBlock( stream_t *s )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ block_t *b;
+
+ /* Release data */
+ while( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
+ p_sys->block.p_first != p_sys->block.p_current )
+ {
+ block_t *b = p_sys->block.p_first;
+
+ p_sys->block.i_start += b->i_buffer;
+ p_sys->block.i_size -= b->i_buffer;
+ p_sys->block.p_first = b->p_next;
+
+ block_Release( b );
+ }
+ if( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
+ p_sys->block.p_current == p_sys->block.p_first &&
+ p_sys->block.p_current->p_next ) /* At least 2 packets */
+ {
+ /* Enough data, don't read more */
+ return VLC_SUCCESS;
+ }
+
+ /* Now read a new block */
+ const int64_t i_start = mdate();
+ for( ;; )
+ {
+ bool b_eof;
+
+ if( s->b_die )
+ return VLC_EGENERIC;
+
+ /* Fetch a block */
+ if( ( b = AReadBlock( s, &b_eof ) ) )
+ break;
+ if( b_eof )
+ return VLC_EGENERIC;
+ }
+
+ p_sys->stat.i_read_time += mdate() - i_start;
+ while( b )
+ {
+ /* Append the block */
+ p_sys->block.i_size += b->i_buffer;
+ *p_sys->block.pp_last = b;
+ p_sys->block.pp_last = &b->p_next;
+
+ /* Fix p_current */
+ if( p_sys->block.p_current == NULL )
+ p_sys->block.p_current = b;
+
+ /* Update stat */
+ p_sys->stat.i_bytes += b->i_buffer;
+ p_sys->stat.i_read_count++;
+
+ b = b->p_next;
+ }
+ return VLC_SUCCESS;
+}
+
+
+/****************************************************************************
+ * 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;
+
+ if( !p_read )
+ {
+ const uint64_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;
+ }
+ return AStreamReadNoSeekStream( s, p_read, i_read );
+}
+
+static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, 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];
+ uint64_t i_off;
+
+ if( tk->i_start >= tk->i_end ) return 0; /* EOF */
+
+#ifdef STREAM_DEBUG
+ msg_Dbg( s, "AStreamPeekStream: %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
+
+ /* Avoid problem, but that should *never* happen */
+ if( i_read > STREAM_CACHE_TRACK_SIZE / 2 )
+ i_read = STREAM_CACHE_TRACK_SIZE / 2;
+
+ while( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
+ {
+ if( p_sys->stream.i_used <= 1 )
+ {
+ /* Be sure we will read something */
+ p_sys->stream.i_used += tk->i_start + p_sys->stream.i_offset + i_read - tk->i_end;
+ }
+ if( AStreamRefillStream( s ) ) break;
+ }
+
+ if( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
+ {
+ i_read = tk->i_end - tk->i_start - p_sys->stream.i_offset;
+ }
+
+
+ /* Now, direct pointer or a copy ? */
+ i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
+ if( i_off + i_read <= STREAM_CACHE_TRACK_SIZE )
+ {
+ *pp_peek = &tk->p_buffer[i_off];
+ return i_read;
+ }
+
+ if( p_sys->i_peek < i_read )
+ {
+ p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
+ if( !p_sys->p_peek )
+ {
+ p_sys->i_peek = 0;
+ return 0;
+ }
+ p_sys->i_peek = i_read;
+ }
+
+ memcpy( p_sys->p_peek, &tk->p_buffer[i_off],
+ STREAM_CACHE_TRACK_SIZE - i_off );
+ memcpy( &p_sys->p_peek[STREAM_CACHE_TRACK_SIZE - i_off],
+ &tk->p_buffer[0], i_read - (STREAM_CACHE_TRACK_SIZE - i_off) );
+
+ *pp_peek = p_sys->p_peek;
+ return i_read;
+}
+
+static int AStreamSeekStream( stream_t *s, uint64_t i_pos )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ 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_current->i_start,
+ p_sys->stream.i_offset,
+ p_current->i_end );
+#endif
+
+ bool b_aseek;
+ access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
+ if( !b_aseek && i_pos < p_current->i_start )
+ {
+ msg_Warn( s, "AStreamSeekStream: can't seek" );
+ return VLC_EGENERIC;
+ }
+
+ bool b_afastseek;
+ access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_afastseek );
+
+ /* FIXME compute seek cost (instead of static 'stupid' value) */
+ uint64_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;
+
+ /* Date the current track */
+ p_current->i_date = mdate();
+
+ /* Search a new track slot */
+ stream_track_t *tk = NULL;
+ int i_tk_idx = -1;
+
+ /* 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( t->i_start > i_pos || i_pos > t->i_end )
+ continue;
+
+ 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];
+
+ 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 );
+
+ if( tk != p_current )
+ i_skip_threshold = 0;
+ if( tk->i_start <= i_pos && i_pos <= tk->i_end + i_skip_threshold )
+ {
+#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 )
+ {
+ 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;
+ }
+ else if( i_pos > tk->i_end )
+ {
+ uint64_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;
+
+ 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;
+
+ /* 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;
+
+ if( AStreamRefillStream( s ) && i_pos == tk->i_end )
+ return VLC_EGENERIC;
+ }
+ return VLC_SUCCESS;
+}
+
+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];
+
+ uint8_t *p_data = (uint8_t *)p_read;
+ unsigned int i_data = 0;
+
+ if( tk->i_start >= tk->i_end )
+ return 0; /* EOF */
+
+#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 )
+ {
+ unsigned i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
+ unsigned int i_current =
+ __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 + i_data <= tk->i_start + p_sys->stream.i_offset + i_read )
+ {
+ const unsigned 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;
+ stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
+
+ /* We read but won't increase i_start after initial start + offset */
+ int i_toread =
+ __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE -
+ (tk->i_end - tk->i_start - p_sys->stream.i_offset) );
+ bool b_read = false;
+ int64_t i_start, i_stop;
+
+ if( i_toread <= 0 ) return VLC_EGENERIC; /* EOF */
+
+#ifdef STREAM_DEBUG
+ msg_Dbg( s, "AStreamRefillStream: used=%d toread=%d",
+ p_sys->stream.i_used, i_toread );
+#endif
+
+ i_start = mdate();
+ while( i_toread > 0 )
+ {
+ int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
+ int i_read;
+
+ if( s->b_die )
+ return VLC_EGENERIC;
+
+ i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
+ i_read = AReadStream( s, &tk->p_buffer[i_off], i_read );
+
+ /* msg_Dbg( s, "AStreamRefillStream: read=%d", i_read ); */
+ if( i_read < 0 )
+ {
+ continue;
+ }
+ else if( i_read == 0 )
+ {
+ if( !b_read )
+ return VLC_EGENERIC;
+ return VLC_SUCCESS;
+ }
+ b_read = true;
+
+ /* Update end */
+ tk->i_end += i_read;
+
+ /* Windows of STREAM_CACHE_TRACK_SIZE */
+ if( tk->i_start + STREAM_CACHE_TRACK_SIZE < tk->i_end )
+ {
+ unsigned i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;
+
+ tk->i_start += i_invalid;
+ p_sys->stream.i_offset -= i_invalid;
+ }
+
+ i_toread -= i_read;
+ p_sys->stream.i_used -= i_read;
+
+ p_sys->stat.i_bytes += i_read;
+ p_sys->stat.i_read_count++;
+ }
+ i_stop = mdate();
+
+ p_sys->stat.i_read_time += i_stop - i_start;
+
+ return VLC_SUCCESS;
+}
+
+static void AStreamPrebufferStream( stream_t *s )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ int64_t i_first = 0;
+ int64_t i_start;
+
+ msg_Dbg( s, "pre buffering" );
+ i_start = mdate();
+ for( ;; )
+ {
+ stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
+
+ int64_t i_date = mdate();
+ int i_read;
+ int i_buffered = tk->i_end - tk->i_start;
+
+ if( s->b_die || i_buffered >= STREAM_CACHE_PREBUFFER_SIZE )
+ {
+ int64_t i_byterate;
+
+ /* Update stat */
+ p_sys->stat.i_bytes = i_buffered;
+ p_sys->stat.i_read_time = i_date - i_start;
+ i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
+ (p_sys->stat.i_read_time+1);
+
+ msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
+ "%"PRId64" KiB/s",
+ p_sys->stat.i_bytes,
+ p_sys->stat.i_read_time / INT64_C(1000000),
+ i_byterate / 1024 );
+ break;
+ }
+
+ /* */
+ i_read = STREAM_CACHE_TRACK_SIZE - i_buffered;
+ i_read = __MIN( (int)p_sys->stream.i_read_size, i_read );
+ i_read = AReadStream( s, &tk->p_buffer[i_buffered], i_read );
+ if( i_read < 0 )
+ continue;
+ else if( i_read == 0 )
+ break; /* EOF */
+
+ if( i_first == 0 )
+ {
+ i_first = mdate();
+ msg_Dbg( s, "received first data after %d ms",
+ (int)((i_first-i_start)/1000) );
+ }
+
+ tk->i_end += i_read;
+
+ p_sys->stat.i_read_count++;
+ }
+}
+
+/****************************************************************************
+ * stream_ReadLine:
+ ****************************************************************************/
+/**
+ * Read from the stream untill first newline.
+ * \param s Stream handle to read from
+ * \return A pointer to the allocated output string. You need to free this when you are done.
+ */
+#define STREAM_PROBE_LINE 2048
+#define STREAM_LINE_MAX (2048*100)
+char *stream_ReadLine( stream_t *s )
+{
+ char *p_line = NULL;
+ int i_line = 0, i_read = 0;
+
+ while( i_read < STREAM_LINE_MAX )
+ {
+ char *psz_eol;
+ const uint8_t *p_data;
+ int i_data;
+ int64_t i_pos;
+
+ /* Probe new data */
+ i_data = stream_Peek( s, &p_data, STREAM_PROBE_LINE );
+ if( i_data <= 0 ) break; /* No more data */
+
+ /* BOM detection */
+ i_pos = stream_Tell( s );
+ if( i_pos == 0 && i_data >= 3 )
+ {
+ int i_bom_size = 0;
+ const char *psz_encoding = NULL;
+
+ if( !memcmp( p_data, "\xEF\xBB\xBF", 3 ) )
+ {
+ psz_encoding = "UTF-8";
+ i_bom_size = 3;
+ }
+ else if( !memcmp( p_data, "\xFF\xFE", 2 ) )
+ {
+ psz_encoding = "UTF-16LE";
+ s->p_text->b_little_endian = true;
+ s->p_text->i_char_width = 2;
+ i_bom_size = 2;
+ }
+ else if( !memcmp( p_data, "\xFE\xFF", 2 ) )
+ {
+ psz_encoding = "UTF-16BE";
+ s->p_text->i_char_width = 2;
+ i_bom_size = 2;
+ }
+
+ /* Seek past the BOM */
+ if( i_bom_size )
+ {
+ stream_Seek( s, i_bom_size );
+ p_data += i_bom_size;
+ i_data -= i_bom_size;
+ }
+
+ /* Open the converter if we need it */
+ if( psz_encoding != NULL )
+ {
+ msg_Dbg( s, "%s BOM detected", psz_encoding );
+ if( s->p_text->i_char_width > 1 )
+ {
+ s->p_text->conv = vlc_iconv_open( "UTF-8", psz_encoding );
+ if( s->p_text->conv == (vlc_iconv_t)-1 )
+ {
+ msg_Err( s, "iconv_open failed" );
+ }
+ }
+
+ /* FIXME that's UGLY */
+ input_thread_t *p_input = s->p_input;
+ if( p_input != NULL)
+ {
+ var_Create( p_input, "subsdec-encoding", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
+ var_SetString( p_input, "subsdec-encoding", "UTF-8" );
+ }
+ }
+ }
+
+ if( i_data % s->p_text->i_char_width )
+ {
+ /* keep i_char_width boundary */
+ i_data = i_data - ( i_data % s->p_text->i_char_width );
+ msg_Warn( s, "the read is not i_char_width compatible");
+ }
+
+ if( i_data == 0 )
+ break;
+
+ /* Check if there is an EOL */
+ if( s->p_text->i_char_width == 1 )
+ {
+ /* UTF-8: 0A <LF> */
+ psz_eol = memchr( p_data, '\n', i_data );
+ if( psz_eol == NULL )
+ /* UTF-8: 0D <CR> */
+ psz_eol = memchr( p_data, '\r', i_data );
+ }
+ else
+ {
+ const uint8_t *p_last = p_data + i_data - s->p_text->i_char_width;
+ uint16_t eol = s->p_text->b_little_endian ? 0x0A00 : 0x00A0;
+
+ assert( s->p_text->i_char_width == 2 );
+ psz_eol = NULL;
+ /* UTF-16: 000A <LF> */
+ for( const uint8_t *p = p_data; p <= p_last; p += 2 )
+ {
+ if( U16_AT( p ) == eol )
+ {
+ psz_eol = (char *)p + 1;
+ break;
+ }
+ }
+
+ if( psz_eol == NULL )
+ { /* UTF-16: 000D <CR> */
+ eol = s->p_text->b_little_endian ? 0x0D00 : 0x00D0;
+ for( const uint8_t *p = p_data; p <= p_last; p += 2 )
+ {
+ if( U16_AT( p ) == eol )
+ {
+ psz_eol = (char *)p + 1;
+ break;
+ }
+ }
+ }
+ }
+
+ if( psz_eol )
+ {
+ i_data = (psz_eol - (char *)p_data) + 1;
+ p_line = realloc_or_free( p_line,
+ i_line + i_data + s->p_text->i_char_width ); /* add \0 */
+ if( !p_line )
+ goto error;
+ i_data = stream_Read( s, &p_line[i_line], i_data );
+ if( i_data <= 0 ) break; /* Hmmm */
+ i_line += i_data - s->p_text->i_char_width; /* skip \n */;
+ i_read += i_data;
+
+ /* We have our line */
+ break;
+ }
+
+ /* Read data (+1 for easy \0 append) */
+ p_line = realloc_or_free( p_line,
+ i_line + STREAM_PROBE_LINE + s->p_text->i_char_width );
+ if( !p_line )
+ goto error;
+ i_data = stream_Read( s, &p_line[i_line], STREAM_PROBE_LINE );
+ if( i_data <= 0 ) break; /* Hmmm */
+ i_line += i_data;
+ i_read += i_data;
+ }
+
+ if( i_read > 0 )
+ {
+ int j;
+ for( j = 0; j < s->p_text->i_char_width; j++ )
+ {
+ p_line[i_line + j] = '\0';
+ }
+ i_line += s->p_text->i_char_width; /* the added \0 */
+ if( s->p_text->i_char_width > 1 )
+ {
+ size_t i_in = 0, i_out = 0;
+ const char * p_in = NULL;
+ char * p_out = NULL;
+ char * psz_new_line = NULL;
+
+ /* iconv */
+ psz_new_line = malloc( i_line );
+ if( psz_new_line == NULL )
+ goto error;
+ i_in = i_out = (size_t)i_line;
+ p_in = p_line;
+ p_out = psz_new_line;
+
+ if( vlc_iconv( s->p_text->conv, &p_in, &i_in, &p_out, &i_out ) == (size_t)-1 )
+ {
+ msg_Err( s, "iconv failed" );
+ msg_Dbg( s, "original: %d, in %d, out %d", i_line, (int)i_in, (int)i_out );
+ }
+ free( p_line );
+ p_line = psz_new_line;
+ i_line = (size_t)i_line - i_out; /* does not include \0 */
+ }
+
+ /* Remove trailing LF/CR */
+ while( i_line >= 2 && ( p_line[i_line-2] == '\r' ||
+ p_line[i_line-2] == '\n') ) i_line--;
+
+ /* Make sure the \0 is there */
+ p_line[i_line-1] = '\0';
+
+ return p_line;
+ }
+
+error:
+ /* We failed to read any data, probably EOF */
+ free( p_line );
+
+ /* */
+ if( s->p_text->conv != (vlc_iconv_t)(-1) )
+ vlc_iconv_close( s->p_text->conv );
+ s->p_text->conv = (vlc_iconv_t)(-1);
+ return NULL;
+}
+
+/****************************************************************************
+ * Access reading/seeking wrappers to handle concatenated streams.
+ ****************************************************************************/
+static int AReadStream( stream_t *s, void *p_read, unsigned int i_read )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ access_t *p_access = p_sys->p_access;
+ input_thread_t *p_input = NULL;
+ int i_read_orig = i_read;
+ int i_total = 0;
+
+ if( s->p_parent && s->p_parent->p_parent &&
+ vlc_internals( s->p_parent->p_parent )->i_object_type == VLC_OBJECT_INPUT )
+ p_input = (input_thread_t *)s->p_parent->p_parent;
+
+ if( !p_sys->i_list )
+ {
+ i_read = p_access->pf_read( p_access, p_read, i_read );
+ if( p_access->b_die )
+ vlc_object_kill( s );
+ if( p_input )
+ {
+ vlc_mutex_lock( &p_input->p->counters.counters_lock );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_bytes, i_read,
+ &i_total );
+ stats_UpdateFloat( s, p_input->p->counters.p_input_bitrate,
+ (float)i_total, NULL );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_packets, 1, NULL );
+ vlc_mutex_unlock( &p_input->p->counters.counters_lock );
+ }
+ return i_read;
+ }
+
+ i_read = p_sys->p_list_access->pf_read( p_sys->p_list_access, p_read,
+ i_read );
+ if( p_access->b_die )
+ vlc_object_kill( s );
+
+ /* If we reached an EOF then switch to the next stream in the list */
+ if( i_read == 0 && p_sys->i_list_index + 1 < p_sys->i_list )
+ {
+ char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
+ access_t *p_list_access;
+
+ msg_Dbg( s, "opening input `%s'", psz_name );
+
+ p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
+
+ if( !p_list_access ) return 0;
+
+ if( p_sys->p_list_access != p_access )
+ access_Delete( p_sys->p_list_access );
+
+ p_sys->p_list_access = p_list_access;
+
+ /* We have to read some data */
+ return AReadStream( s, p_read, i_read_orig );
+ }
+
+ /* Update read bytes in input */
+ if( p_input )
+ {
+ vlc_mutex_lock( &p_input->p->counters.counters_lock );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_bytes, i_read, &i_total );
+ stats_UpdateFloat( s, p_input->p->counters.p_input_bitrate,
+ (float)i_total, NULL );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_packets, 1, NULL );
+ vlc_mutex_unlock( &p_input->p->counters.counters_lock );
+ }
+ return i_read;
+}
+
+static block_t *AReadBlock( stream_t *s, bool *pb_eof )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ access_t *p_access = p_sys->p_access;
+ input_thread_t *p_input = NULL;
+ block_t *p_block;
+ bool b_eof;
+ int i_total = 0;
+
+ if( s->p_parent && s->p_parent->p_parent &&
+ vlc_internals( s->p_parent->p_parent )->i_object_type == VLC_OBJECT_INPUT )
+ p_input = (input_thread_t *)s->p_parent->p_parent;
+
+ if( !p_sys->i_list )
+ {
+ p_block = p_access->pf_block( p_access );
+ if( p_access->b_die )
+ vlc_object_kill( s );
+ if( pb_eof ) *pb_eof = p_access->info.b_eof;
+ if( p_input && p_block && libvlc_stats (p_access) )
+ {
+ vlc_mutex_lock( &p_input->p->counters.counters_lock );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_bytes,
+ p_block->i_buffer, &i_total );
+ stats_UpdateFloat( s, p_input->p->counters.p_input_bitrate,
+ (float)i_total, NULL );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_packets, 1, NULL );
+ vlc_mutex_unlock( &p_input->p->counters.counters_lock );
+ }
+ return p_block;
+ }
+
+ p_block = p_sys->p_list_access->pf_block( p_sys->p_list_access );
+ if( p_access->b_die )
+ vlc_object_kill( s );
+ b_eof = p_sys->p_list_access->info.b_eof;
+ if( pb_eof ) *pb_eof = b_eof;
+
+ /* If we reached an EOF then switch to the next stream in the list */
+ if( !p_block && b_eof && p_sys->i_list_index + 1 < p_sys->i_list )
+ {
+ char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
+ access_t *p_list_access;
+
+ msg_Dbg( s, "opening input `%s'", psz_name );
+
+ p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
+
+ if( !p_list_access ) return 0;
+
+ if( p_sys->p_list_access != p_access )
+ access_Delete( p_sys->p_list_access );
+
+ p_sys->p_list_access = p_list_access;
+
+ /* We have to read some data */
+ return AReadBlock( s, pb_eof );
+ }
+ if( p_block )
+ {
+ if( p_input )
+ {
+ vlc_mutex_lock( &p_input->p->counters.counters_lock );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_bytes,
+ p_block->i_buffer, &i_total );
+ stats_UpdateFloat( s, p_input->p->counters.p_input_bitrate,
+ (float)i_total, NULL );
+ stats_UpdateInteger( s, p_input->p->counters.p_read_packets,
+ 1 , NULL);
+ vlc_mutex_unlock( &p_input->p->counters.counters_lock );
+ }
+ }
+ return p_block;
+}
+
+static int ASeek( stream_t *s, uint64_t i_pos )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ access_t *p_access = p_sys->p_access;
+
+ /* Check which stream we need to access */
+ if( p_sys->i_list )
+ {
+ int i;
+ char *psz_name;
+ int64_t i_size = 0;
+ access_t *p_list_access = 0;
+
+ for( i = 0; i < p_sys->i_list - 1; i++ )
+ {
+ if( i_pos < p_sys->list[i]->i_size + i_size ) break;
+ i_size += p_sys->list[i]->i_size;
+ }
+ psz_name = p_sys->list[i]->psz_path;
+
+ if( i != p_sys->i_list_index )
+ msg_Dbg( s, "opening input `%s'", psz_name );
+
+ if( i != p_sys->i_list_index && i != 0 )
+ {
+ p_list_access =
+ access_New( s, s->p_input, p_access->psz_access, "", psz_name );
+ }
+ else if( i != p_sys->i_list_index )
+ {
+ p_list_access = p_access;
+ }
+
+ if( p_list_access )
+ {
+ if( p_sys->p_list_access != p_access )
+ access_Delete( p_sys->p_list_access );
+
+ p_sys->p_list_access = p_list_access;
+ }
+
+ p_sys->i_list_index = i;
+ return p_sys->p_list_access->pf_seek( p_sys->p_list_access,
+ i_pos - i_size );
+ }
+
+ return p_access->pf_seek( p_access, i_pos );
+}
+
+
+/**
+ * Try to read "i_read" bytes into a buffer pointed by "p_read". If
+ * "p_read" is NULL then data are skipped instead of read. The return
+ * value is the real numbers of bytes read/skip. If this value is less
+ * than i_read that means that it's the end of the stream.
+ */
+int stream_Read( stream_t *s, void *p_read, int i_read )
+{
+ return s->pf_read( s, p_read, i_read );
+}
+
+/**
+ * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
+ * \return The real numbers of valid bytes, if it's less
+ * or equal to 0, *pp_peek is invalid.
+ * \note pp_peek is a pointer to internal buffer and it will be invalid as
+ * soons as other stream_* functions are called.
+ * \note Due to input limitation, it could be less than i_peek without meaning
+ * the end of the stream (but only when you have i_peek >=
+ * p_input->i_bufsize)
+ */
+int stream_Peek( stream_t *s, const uint8_t **pp_peek, int i_peek )
+{
+ return s->pf_peek( s, pp_peek, i_peek );
+}
+
+/**
+ * Use to control the "stream_t *". Look at #stream_query_e for
+ * possible "i_query" value and format arguments. Return VLC_SUCCESS
+ * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
+ */
+int stream_vaControl( stream_t *s, int i_query, va_list args )
+{
+ return s->pf_control( s, i_query, args );
+}
+
+/**
+ * Destroy a stream
+ */
+void stream_Delete( stream_t *s )
+{
+ s->pf_destroy( s );
+}
+
+int stream_Control( stream_t *s, int i_query, ... )
+{
+ va_list args;
+ int i_result;
+
+ if( s == NULL )
+ return VLC_EGENERIC;
+
+ va_start( args, i_query );
+ i_result = s->pf_control( s, i_query, args );
+ va_end( args );
+ return i_result;
+}
+
+/**
+ * Read "i_size" bytes and store them in a block_t.
+ * It always read i_size bytes unless you are at the end of the stream
+ * where it return what is available.
+ */
+block_t *stream_Block( stream_t *s, int i_size )
+{
+ if( i_size <= 0 ) return NULL;
+
+ /* emulate block read */
+ block_t *p_bk = block_New( s, i_size );
+ if( p_bk )
+ {
+ int i_read = stream_Read( s, p_bk->p_buffer, i_size );
+ if( i_read > 0 )
+ {
+ p_bk->i_buffer = i_read;
+ return p_bk;
+ }
+ block_Release( p_bk );
+ }
+ return NULL;
+}
projects / vlc / blobdiff