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gstreamer/ext/ogg/gstoggdemux.c
Wim Taymans 8d9d369e83 ext/: More seeking fixes, oggdemux now supports seeking to time and uses the downstream element to convert granulepos... 
Original commit message from CVS:
* ext/ogg/gstoggdemux.c: (gst_ogg_demux_init),
(gst_ogg_demux_get_formats), (gst_ogg_demux_src_query),
(gst_ogg_demux_src_event), (gst_ogg_demux_src_convert),
(gst_ogg_demux_handle_event), (gst_ogg_demux_seek_before),
(_find_chain_get_unknown_part), (_find_streams_check),
(gst_ogg_demux_push), (gst_ogg_pad_push):
* ext/theora/theoradec.c: (theora_get_formats),
(theora_dec_src_convert), (theora_dec_sink_convert),
(theora_dec_src_query), (theora_dec_src_event), (theora_dec_event),
(theora_dec_chain):
* ext/vorbis/vorbisdec.c: (vorbis_dec_get_formats),
(vorbis_dec_convert), (vorbis_dec_src_query),
(vorbis_dec_src_event), (vorbis_dec_event):
More seeking fixes, oggdemux now supports seeking to time and
uses the downstream element to convert granulepos to time.
Seeking in theora-only ogg files now works.
2004-07-21 16:48:20 +00:00

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/* GStreamer
* Copyright (C) 2003, 2004 Benjamin Otte <otte@gnome.org>
*
* gstoggdemux.c: ogg stream demuxer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/bytestream/filepad.h>
#include <ogg/ogg.h>
#include <string.h>
/* tweak this to improve setup times */
/* PLEASE don't just tweak it because one file is faster with tweaked numbers,
* but use a good benchmark with both video and audio files */
/* number of bytes we seek in front of desired point so we can resync properly */
#define SETUP_EXPECTED_PAGE_SIZE (8500) /* this is out of vorbisfile */
/* number of bytes where we don't seek to middle anymore but just walk through
* all packets */
#define SETUP_PASSTHROUGH_SIZE (SETUP_EXPECTED_PAGE_SIZE * 20)
/* if we have to repeat a seek backwards because we didn't seek back far enough,
* we multiply the amount we seek by this amount */
#define SETUP_SEEK_MULTIPLIER (5)
GST_DEBUG_CATEGORY_STATIC (gst_ogg_demux_debug);
GST_DEBUG_CATEGORY_STATIC (gst_ogg_demux_setup_debug);
#define GST_CAT_DEFAULT gst_ogg_demux_debug
#define GST_TYPE_OGG_DEMUX (gst_ogg_demux_get_type())
#define GST_OGG_DEMUX(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OGG_DEMUX, GstOggDemux))
#define GST_OGG_DEMUX_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OGG_DEMUX, GstOggDemux))
#define GST_IS_OGG_DEMUX(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OGG_DEMUX))
#define GST_IS_OGG_DEMUX_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OGG_DEMUX))
typedef struct _GstOggDemux GstOggDemux;
typedef struct _GstOggDemuxClass GstOggDemuxClass;
typedef enum
{
/* just because you shouldn't make a valid enum value 0 */
GST_OGG_STATE_INAVLID,
/* just started, we need to decide if we should do setup */
GST_OGG_STATE_START,
/* setup is analyzing the stream, getting lengths and so on */
GST_OGG_STATE_SETUP,
/* after a seek, during resyncing */
GST_OGG_STATE_SEEK,
/* normal playback */
GST_OGG_STATE_PLAY
}
GstOggState;
/* all information needed for one ogg stream */
typedef struct
{
GstPad *pad; /* reference for this pad is held by element we belong to */
gint serial;
ogg_stream_state stream;
guint64 offset; /* end offset of last buffer */
guint64 known_offset; /* last known offset */
gint64 packetno; /* number of next expected packet */
guint64 length; /* length of stream or 0 */
glong pages; /* number of pages in stream or 0 */
gint64 start_offset; /* earliest offset in file where this stream has been found */
gboolean start_found; /* we have found the bos (first) page */
gint64 end_offset; /* last offset in file where this stream has been found */
gboolean end_found; /* we have fount the eos (last) page */
guint flags;
}
GstOggPad;
typedef enum
{
GST_OGG_PAD_NEEDS_DISCONT = (1 << 0),
GST_OGG_PAD_NEEDS_FLUSH = (1 << 1)
}
GstOggPadFlags;
/* all information needed for one ogg chain (relevant for chained bitstreams) */
typedef struct
{
gint64 starts_at; /* starting offset of chain */
gint64 ends_at; /* end offset of stream (only valid when not last chain or not in setup) */
GSList *pads; /* list of GstOggPad */
}
GstOggChain;
#define CURRENT_CHAIN(ogg) (&g_array_index ((ogg)->chains, GstOggChain, (ogg)->current_chain))
#define FOR_PAD_IN_CURRENT_CHAIN(ogg, __pad, ...) \
FOR_PAD_IN_CHAIN(ogg, __pad, (ogg)->current_chain, __VA_ARGS__)
#define FOR_PAD_IN_CHAIN(ogg, _pad, i, ...) G_STMT_START{ \
GSList *_walk; \
GstOggChain *_chain = &g_array_index ((ogg)->chains, GstOggChain, i); \
if (i != -1) { \
for (_walk = _chain->pads; _walk; _walk = g_slist_next (_walk)) { \
GstOggPad *_pad = (GstOggPad *) _walk->data; \
__VA_ARGS__ \
} \
} \
}G_STMT_END
typedef enum
{
GST_OGG_FLAG_BOS = GST_ELEMENT_FLAG_LAST,
GST_OGG_FLAG_EOS,
GST_OGG_FLAG_WAIT_FOR_DISCONT
}
GstOggFlag;
struct _GstOggDemux
{
GstElement element;
/* pad */
GstFilePad *sinkpad;
/* state */
GstOggState state;
GArray *chains; /* list of chains we know */
gint current_chain; /* id of chain that currently "plays" */
gboolean bos; /* no-more-pads signal needs this */
/* setup */
GSList *unordered; /* streams we haven't found chains for yet */
guint setup_state; /* seperate from global state */
/* ogg stuff */
ogg_sync_state sync;
/* seeking */
GstOggPad *seek_pad;
gint64 seek_to;
gint64 seek_skipped;
GstFormat seek_format;
};
struct _GstOggDemuxClass
{
GstElementClass parent_class;
};
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
/* FILL ME */
};
static GstStaticPadTemplate ogg_demux_src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate ogg_demux_sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/ogg")
);
/* different setup phases */
typedef enum
{
SETUP_INVALID,
SETUP_READ_FIRST_BOS,
SETUP_READ_BOS,
SETUP_FIND_LAST_CHAIN,
SETUP_FIND_END_OF_CHAIN,
SETUP_FIND_END_OF_STREAMS,
SETUP_FIND_END_OF_LAST_STREAMS
}
GstOggSetupState;
typedef struct
{
gboolean (*init) (GstOggDemux * ogg);
gboolean (*process) (GstOggDemux * ogg, ogg_page * page);
}
SetupStateFunc;
static gboolean _read_bos_init (GstOggDemux * ogg);
static gboolean _read_bos_process (GstOggDemux * ogg, ogg_page * page);
static gboolean _find_chain_init (GstOggDemux * ogg);
static gboolean _find_chain_process (GstOggDemux * ogg, ogg_page * page);
static gboolean _find_last_chain_init (GstOggDemux * ogg);
static gboolean _find_last_chain_process (GstOggDemux * ogg, ogg_page * page);
static gboolean _find_streams_init (GstOggDemux * ogg);
static gboolean _find_streams_process (GstOggDemux * ogg, ogg_page * page);
static SetupStateFunc setup_funcs[] = {
{NULL, NULL},
{_read_bos_init, _read_bos_process},
{_read_bos_init, _read_bos_process},
{_find_last_chain_init, _find_last_chain_process},
{_find_chain_init, _find_chain_process},
{_find_streams_init, _find_streams_process},
{_find_streams_init, _find_streams_process},
{NULL, NULL} /* just because */
};
static gboolean gst_ogg_demux_set_setup_state (GstOggDemux * ogg,
GstOggSetupState state);
static void gst_ogg_demux_finalize (GObject * object);
static gboolean gst_ogg_demux_src_event (GstPad * pad, GstEvent * event);
static const GstEventMask *gst_ogg_demux_get_event_masks (GstPad * pad);
static const GstQueryType *gst_ogg_demux_get_query_types (GstPad * pad);
static const GstFormat *gst_ogg_demux_get_formats (GstPad * pad);
static gboolean gst_ogg_demux_src_query (GstPad * pad,
GstQueryType type, GstFormat * format, gint64 * value);
static void gst_ogg_demux_iterate (GstFilePad * pad);
static gboolean gst_ogg_demux_handle_event (GstPad * pad, GstEvent * event);
static GstElementStateReturn gst_ogg_demux_change_state (GstElement * element);
static GstOggPad *gst_ogg_pad_new (GstOggDemux * ogg, int serial_no);
static void gst_ogg_pad_remove (GstOggDemux * ogg, GstOggPad * ogg_pad);
static void gst_ogg_pad_reset (GstOggDemux * ogg, GstOggPad * pad);
static void gst_ogg_demux_push (GstOggDemux * ogg, ogg_page * page);
static void gst_ogg_pad_push (GstOggDemux * ogg, GstOggPad * ogg_pad);
static void gst_ogg_chains_clear (GstOggDemux * ogg);
static void gst_ogg_add_chain (GstOggDemux * ogg);
static GstCaps *gst_ogg_type_find (ogg_packet * packet);
static void gst_ogg_print (GstOggDemux * demux);
#define GST_OGG_SET_STATE(ogg, new_state) G_STMT_START{ \
GST_DEBUG_OBJECT (ogg, "setting state to %s", G_STRINGIFY (new_state)); \
ogg->state = new_state; \
ogg->setup_state = (new_state == GST_OGG_STATE_SETUP) ? \
SETUP_READ_FIRST_BOS : SETUP_INVALID; \
}G_STMT_END
GST_BOILERPLATE (GstOggDemux, gst_ogg_demux, GstElement, GST_TYPE_ELEMENT)
static void gst_ogg_demux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
static GstElementDetails gst_ogg_demux_details =
GST_ELEMENT_DETAILS ("ogg demuxer",
"Codec/Demuxer",
"demux ogg streams (info about ogg: http://xiph.org)",
"Benjamin Otte <otte@gnome.org>");
gst_element_class_set_details (element_class, &gst_ogg_demux_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&ogg_demux_sink_template_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&ogg_demux_src_template_factory));
}
static void
gst_ogg_demux_class_init (GstOggDemuxClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gstelement_class->change_state = gst_ogg_demux_change_state;
gobject_class->finalize = gst_ogg_demux_finalize;
}
static void
gst_ogg_demux_init (GstOggDemux * ogg)
{
GST_FLAG_SET (ogg, GST_ELEMENT_EVENT_AWARE);
/* create the sink pad */
ogg->sinkpad =
GST_FILE_PAD (gst_file_pad_new (gst_static_pad_template_get
(&ogg_demux_sink_template_factory), "sink"));
gst_file_pad_set_iterate_function (ogg->sinkpad, gst_ogg_demux_iterate);
gst_file_pad_set_event_function (ogg->sinkpad, gst_ogg_demux_handle_event);
gst_pad_set_formats_function (GST_PAD (ogg->sinkpad),
gst_ogg_demux_get_formats);
gst_element_add_pad (GST_ELEMENT (ogg), GST_PAD (ogg->sinkpad));
/* initalize variables */
GST_OGG_SET_STATE (ogg, GST_OGG_STATE_START);
ogg->chains = g_array_new (TRUE, TRUE, sizeof (GstOggChain));
ogg->current_chain = -1;
}
static void
gst_ogg_demux_finalize (GObject * object)
{
GstOggDemux *ogg;
ogg = GST_OGG_DEMUX (object);
/* chains are removed when going to READY */
g_assert (ogg->current_chain == -1);
g_assert (ogg->chains->len == 0);
g_array_free (ogg->chains, TRUE);
}
static const GstFormat *
gst_ogg_demux_get_formats (GstPad * pad)
{
static GstFormat src_formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_DEFAULT, /* granulepos */
GST_FORMAT_TIME,
0
};
static GstFormat sink_formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_DEFAULT, /* bytes */
0
};
return (GST_PAD_IS_SRC (pad) ? src_formats : sink_formats);
}
static const GstEventMask *
gst_ogg_demux_get_event_masks (GstPad * pad)
{
static const GstEventMask gst_ogg_demux_src_event_masks[] = {
{GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH},
{0,}
};
return gst_ogg_demux_src_event_masks;
}
static const GstQueryType *
gst_ogg_demux_get_query_types (GstPad * pad)
{
static const GstQueryType gst_ogg_demux_src_query_types[] = {
GST_QUERY_TOTAL,
GST_QUERY_POSITION,
0
};
return gst_ogg_demux_src_query_types;
}
static GstOggPad *
gst_ogg_get_pad_by_pad (GstOggDemux * ogg, GstPad * pad)
{
GSList *walk;
GstOggPad *cur;
if (ogg->current_chain == -1) {
GST_DEBUG_OBJECT (ogg, "no active chain, returning NULL");
return NULL;
}
for (walk = CURRENT_CHAIN (ogg)->pads; walk; walk = g_slist_next (walk)) {
cur = (GstOggPad *) walk->data;
if (cur->pad == pad)
return cur;
}
return NULL;
}
/* the query function on the src pad only knows about granulepos
* values but we can use the peer plugins to convert the granulepos
* (which is supposed to be the default format) to any other format
*/
static gboolean
gst_ogg_demux_src_query (GstPad * pad, GstQueryType type,
GstFormat * format, gint64 * value)
{
gboolean res = FALSE;
GstOggDemux *ogg;
GstOggPad *cur;
guint64 granulepos;
ogg = GST_OGG_DEMUX (gst_pad_get_parent (pad));
cur = gst_ogg_get_pad_by_pad (ogg, pad);
if (!cur)
return FALSE;
switch (type) {
case GST_QUERY_TOTAL:{
granulepos = cur->length;
res = TRUE;
break;
}
case GST_QUERY_POSITION:
if (cur->length != 0) {
granulepos = cur->known_offset;
res = TRUE;
}
break;
default:
break;
}
if (res) {
/* still ok, got a granulepos then */
switch (*format) {
case GST_FORMAT_DEFAULT:
/* fine, result should be granulepos */
*value = granulepos;
res = TRUE;
break;
default:
/* something we have to ask our peer */
res = gst_pad_convert (GST_PAD_PEER (pad),
GST_FORMAT_DEFAULT, granulepos, format, value);
break;
}
}
return res;
}
/* The current seeking implementation is the most simple I could come up with:
* - when seeking forwards, just discard data until desired position is reached
* - when seeking backwards, seek to beginning and seek forward from there
* Anyone is free to improve this algorithm as it is quite stupid and probably
* really slow.
*
* The seeking position can be specified as the granulepos in case a decoder
* plugin can give us a correct granulepos, or in timestamps.
* In the case of a time seek, we repeadedly ask the peer element to
* convert the granulepos in the page to a timestamp. We go back to playing
* when the timestamp is the requested one (or close enough to it).
*/
static gboolean
gst_ogg_demux_src_event (GstPad * pad, GstEvent * event)
{
GstOggDemux *ogg;
GstOggPad *cur;
ogg = GST_OGG_DEMUX (gst_pad_get_parent (pad));
cur = gst_ogg_get_pad_by_pad (ogg, pad);
/* FIXME: optimize this so events from inactive chains work?
* in theory there shouldn't be an exisiting pad for inactive chains */
if (cur == NULL)
goto error;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
gint64 offset, position;
GstFormat format, my_format;
gboolean res;
format = GST_EVENT_SEEK_FORMAT (event);
offset = GST_EVENT_SEEK_OFFSET (event);
my_format = format;
/* get position, we'll need it later to decide what direction
* we need to seek in */
res = gst_ogg_demux_src_query (pad,
GST_QUERY_POSITION, &my_format, &position);
if (!res)
goto error;
switch (GST_EVENT_SEEK_METHOD (event)) {
case GST_SEEK_METHOD_END:
{
gint64 value;
/* invalid offset */
if (offset > 0)
goto error;
/* calculate total length first */
res = gst_ogg_demux_src_query (pad,
GST_QUERY_TOTAL, &my_format, &value);
if (!res)
goto error;
/* requested position is end + offset */
offset = value + offset;
break;
}
case GST_SEEK_METHOD_CUR:
{
/* add current position to offset */
offset = position + offset;
break;
}
case GST_SEEK_METHOD_SET:
/* offset and format are fine here */
break;
default:
g_warning ("invalid seek method in seek event");
goto error;
}
if (offset < position) {
/* seek backwards, move to beginning of file */
if (gst_file_pad_seek (ogg->sinkpad, 0, GST_SEEK_METHOD_SET) != 0)
goto error;
ogg_sync_clear (&ogg->sync);
} else {
/* seek forwards flush and skip */
FOR_PAD_IN_CURRENT_CHAIN (ogg, pad, if (GST_PAD_IS_USABLE (pad->pad))
gst_pad_push (pad->pad,
GST_DATA (gst_event_new (GST_EVENT_FLUSH))););
}
GST_OGG_SET_STATE (ogg, GST_OGG_STATE_SEEK);
FOR_PAD_IN_CURRENT_CHAIN (ogg, pad,
pad->flags |= GST_OGG_PAD_NEEDS_DISCONT;);
GST_DEBUG_OBJECT (ogg,
"initiating seeking to format %d, offset %" G_GUINT64_FORMAT, format,
offset);
/* store format and position we seek to */
ogg->seek_pad = cur;
ogg->seek_to = offset;
ogg->seek_format = format;
gst_event_unref (event);
return TRUE;
}
default:
return gst_pad_event_default (pad, event);
}
g_assert_not_reached ();
error:
gst_event_unref (event);
return FALSE;
}
static gboolean
gst_ogg_demux_src_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = FALSE;
GstOggDemux *ogg;
GstOggPad *cur;
ogg = GST_OGG_DEMUX (gst_pad_get_parent (pad));
cur = gst_ogg_get_pad_by_pad (ogg, pad);
/* fill me, not sure with what... */
return res;
}
static void
gst_ogg_start_playing (GstOggDemux * ogg)
{
GST_DEBUG_OBJECT (ogg, "done with setup, changing to playback now");
if (gst_file_pad_seek (ogg->sinkpad, 0, GST_SEEK_METHOD_SET) != 0) {
GST_ELEMENT_ERROR (ogg, CORE, SEEK, (NULL),
("cannot seek to start after EOS"));
}
ogg_sync_clear (&ogg->sync);
if (ogg->current_chain >= 0) {
ogg->current_chain = 0;
} else {
gst_ogg_add_chain (ogg);
}
GST_FLAG_UNSET (ogg, GST_OGG_FLAG_EOS);
GST_FLAG_SET (ogg, GST_OGG_FLAG_WAIT_FOR_DISCONT);
GST_OGG_SET_STATE (ogg, GST_OGG_STATE_PLAY);
gst_ogg_print (ogg);
}
static gboolean
gst_ogg_demux_handle_event (GstPad * pad, GstEvent * event)
{
GstOggDemux *ogg = GST_OGG_DEMUX (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
GST_DEBUG_OBJECT (ogg, "got a discont event");
ogg_sync_reset (&ogg->sync);
gst_event_unref (event);
GST_FLAG_UNSET (ogg, GST_OGG_FLAG_WAIT_FOR_DISCONT);
FOR_PAD_IN_CURRENT_CHAIN (ogg, pad,
pad->flags |= GST_OGG_PAD_NEEDS_DISCONT;);
break;
default:
gst_pad_event_default (pad, event);
break;
}
return TRUE;
}
static void
gst_ogg_demux_eos (GstOggDemux * ogg)
{
guint i;
GSList *walk;
GstEvent *event;
GST_DEBUG_OBJECT (ogg, "got EOS");
ogg->current_chain = -1;
if (ogg->state == GST_OGG_STATE_SETUP) {
gst_ogg_start_playing (ogg);
return;
}
event = gst_event_new (GST_EVENT_EOS);
for (i = 0; i < ogg->chains->len; i++) {
GstOggChain *chain = &g_array_index (ogg->chains, GstOggChain, i);
for (walk = chain->pads; walk; walk = g_slist_next (walk)) {
GstOggPad *pad = (GstOggPad *) walk->data;
if (pad->pad && GST_PAD_IS_USABLE (pad->pad)) {
gst_data_ref (GST_DATA (event));
gst_pad_push (pad->pad, GST_DATA (event));
}
}
}
gst_element_set_eos (GST_ELEMENT (ogg));
gst_event_unref (event);
}
static GstOggPad *
gst_ogg_pad_get_in_chain (GstOggDemux * ogg, guint chain, int serial)
{
FOR_PAD_IN_CHAIN (ogg, pad, chain, if (pad->serial == serial)
return pad;);
return NULL;
}
/* get the pad with the given serial in the current stream or NULL if none */
static GstOggPad *
gst_ogg_pad_get_in_current_chain (GstOggDemux * ogg, int serial)
{
if (ogg->current_chain == -1)
return NULL;
g_return_val_if_fail (ogg->current_chain < ogg->chains->len, NULL);
return gst_ogg_pad_get_in_chain (ogg, ogg->current_chain, serial);
}
/* FIXME: HACK - i dunno if this is supported ogg API */
static guint
gst_ogg_page_get_length (ogg_page * page)
{
return page->header_len + page->body_len;
}
static gint64
gst_ogg_demux_position (GstOggDemux * ogg)
{
gint64 pos = gst_file_pad_tell (ogg->sinkpad);
if (pos < 0)
return pos;
return pos - ogg->sync.fill + ogg->sync.returned;
}
/* END HACK */
/* fill in values from this page */
#include <signal.h>
static void
gst_ogg_pad_populate (GstOggDemux * ogg, GstOggPad * pad, ogg_page * page)
{
gint64 start, end;
if (pad->length < ogg_page_granulepos (page))
pad->length = ogg_page_granulepos (page);
if (pad->pages < ogg_page_pageno (page))
pad->pages = ogg_page_pageno (page);
end = gst_ogg_demux_position (ogg);
if (end >= 0) {
/* we need to know the offsets into the stream for the current page */
start = end - gst_ogg_page_get_length (page);
//g_print ("really setting start from %lld to %lld\n", pad->start_offset, start);
//g_print ("really setting end from %lld to %lld\n", pad->end_offset, end);
if (start < pad->start_offset || pad->start_offset < 0)
pad->start_offset = start;
if (ogg_page_bos (page))
pad->start_found = TRUE;
if (end > pad->end_offset)
pad->end_offset = end;
if (ogg_page_eos (page))
pad->end_found = TRUE;
}
}
/* get the ogg pad with the given serial in the unordered list or create and add it */
static GstOggPad *
gst_ogg_pad_get_unordered (GstOggDemux * ogg, ogg_page * page)
{
GSList *walk;
GstOggPad *pad;
int serial = ogg_page_serialno (page);
for (walk = ogg->unordered; walk; walk = g_slist_next (walk)) {
pad = (GstOggPad *) walk->data;
if (pad->serial == serial)
goto out;
}
pad = gst_ogg_pad_new (ogg, serial);
ogg->unordered = g_slist_prepend (ogg->unordered, pad);
out:
/* update start and end pointer if applicable */
gst_ogg_pad_populate (ogg, pad, page);
return pad;
}
static GstOggPad *
gst_ogg_pad_get (GstOggDemux * ogg, ogg_page * page)
{
GstOggPad *pad =
gst_ogg_pad_get_in_current_chain (ogg, ogg_page_serialno (page));
if (pad) {
gst_ogg_pad_populate (ogg, pad, page);
} else {
pad = gst_ogg_pad_get_unordered (ogg, page);
}
return pad;
}
static void
gst_ogg_add_chain (GstOggDemux * ogg)
{
GST_LOG_OBJECT (ogg, "adding chain %u", ogg->chains->len);
ogg->current_chain = ogg->chains->len;
g_array_set_size (ogg->chains, ogg->chains->len + 1);
}
/* abort setup phase and just start playing */
static void
abort_setup (GstOggDemux * ogg)
{
gst_ogg_print (ogg);
gst_ogg_chains_clear (ogg);
gst_ogg_start_playing (ogg);
}
#undef GST_CAT_DEFAULT
#define GST_CAT_DEFAULT gst_ogg_demux_setup_debug
static gboolean
gst_ogg_demux_set_setup_state (GstOggDemux * ogg, GstOggSetupState state)
{
g_assert (ogg->state == GST_OGG_STATE_SETUP);
g_assert (state > 0);
g_assert (state < G_N_ELEMENTS (setup_funcs));
g_assert (state != ogg->setup_state);
GST_DEBUG_OBJECT (ogg, "setting setup state from %d to %d", ogg->setup_state,
state);
ogg->setup_state = state;
if (!setup_funcs[state].init (ogg)) {
abort_setup (ogg);
return FALSE;
}
return TRUE;
}
/* seeks to the given position if TRUE is returned. Seeks a bit before this
* offset for syncing. You can call this function multiple times, if sync
* failed, it will then seek further back. It will never seek further back as
* min_offset though.
*/
static gboolean
gst_ogg_demux_seek_before (GstOggDemux * ogg, gint64 offset, gint64 min_offset)
{
gint64 before;
GstOggChain *chain;
gint streams;
/* figure out how many streams are in this chain */
chain = CURRENT_CHAIN (ogg);
if (chain) {
streams = g_slist_length (chain->pads);
} else {
streams = 1;
}
/* need to multiply the expected page size with the numer of streams we
* detected to have a good chance of finding all pages */
before = ogg->seek_skipped ? ogg->seek_skipped * SETUP_SEEK_MULTIPLIER :
SETUP_EXPECTED_PAGE_SIZE * streams;
GST_DEBUG_OBJECT (ogg,
"seeking to %" G_GINT64_FORMAT " bytes before %" G_GINT64_FORMAT,
before, offset);
/* tried to seek to start once, don't try again */
if (min_offset + ogg->seek_skipped > offset)
return FALSE;
if (gst_file_pad_seek (ogg->sinkpad, MAX (min_offset, offset - before),
GST_SEEK_METHOD_SET) != 0)
return FALSE;
ogg_sync_clear (&ogg->sync);
ogg->seek_skipped = before;
ogg->seek_to = offset;
return TRUE;
}
static gboolean
_read_bos_init (GstOggDemux * ogg)
{
gst_ogg_add_chain (ogg);
return TRUE;
}
static gboolean
_read_bos_process (GstOggDemux * ogg, ogg_page * page)
{
/* here we're reading in the bos pages of the current chain */
if (ogg_page_bos (page)) {
GstOggPad *pad;
GST_LOG_OBJECT (ogg,
"SETUP_READ_BOS: bos found with serial %d, adding to current chain",
ogg_page_serialno (page));
pad = gst_ogg_pad_get_unordered (ogg, page);
ogg->unordered = g_slist_remove (ogg->unordered, pad);
g_assert (CURRENT_CHAIN (ogg));
CURRENT_CHAIN (ogg)->pads =
g_slist_prepend (CURRENT_CHAIN (ogg)->pads, pad);
} else {
if (CURRENT_CHAIN (ogg)->pads == NULL) {
GST_ERROR_OBJECT (ogg, "broken ogg stream, chain has no BOS pages");
return FALSE;
}
GST_DEBUG_OBJECT (ogg,
"SETUP_READ_BOS: no more bos pages, going to find end of stream");
if (ogg->setup_state == SETUP_READ_FIRST_BOS) {
return gst_ogg_demux_set_setup_state (ogg, SETUP_FIND_LAST_CHAIN);
} else if (ogg->unordered) {
return gst_ogg_demux_set_setup_state (ogg,
SETUP_FIND_END_OF_LAST_STREAMS);
} else {
return gst_ogg_demux_set_setup_state (ogg, SETUP_FIND_END_OF_STREAMS);
}
}
return TRUE;
}
static gboolean
_find_chain_get_unknown_part (GstOggDemux * ogg, gint64 * start, gint64 * end)
{
*start = 0;
*end = G_MAXINT64;
g_assert (ogg->current_chain >= 0);
FOR_PAD_IN_CURRENT_CHAIN (ogg, pad, *start = MAX (*start, pad->end_offset););
if (ogg->setup_state == SETUP_FIND_LAST_CHAIN) {
*end = gst_file_pad_get_length (ogg->sinkpad);
if (*end < 0)
return FALSE;
} else {
GSList *walk;
g_assert (ogg->unordered != NULL);
for (walk = ogg->unordered; walk; walk = g_slist_next (walk)) {
GstOggPad *temp = walk->data;
*end = MIN (*end, temp->start_offset);
}
}
GST_DEBUG_OBJECT (ogg, "we're looking for a new chain in the range [%"
G_GINT64_FORMAT ", %" G_GINT64_FORMAT "]", *start, *end);
/* overlapping chains?! */
if (*end < *start) {
GST_ERROR_OBJECT (ogg, "chained streams overlap, bailing out");
return FALSE;
}
return TRUE;
}
static gboolean
_find_last_chain_init (GstOggDemux * ogg)
{
gint64 end = gst_file_pad_get_length (ogg->sinkpad);
ogg->seek_skipped = 0;
if (end < 0)
return FALSE;
if (!gst_ogg_demux_seek_before (ogg, end, 0))
return FALSE;
return TRUE;
}
static gboolean
_find_last_chain_process (GstOggDemux * ogg, ogg_page * page)
{
GstOggPad *pad = gst_ogg_pad_get (ogg, page);
/* optimization: set eos as found - we're investigating last pages here anyway */
pad->end_found = TRUE;
/* set to 0 to indicate we found a page */
ogg->seek_skipped = 0;
return TRUE;
}
static gboolean
_find_chain_seek (GstOggDemux * ogg, gint64 start, gint64 end)
{
if (end - start < SETUP_PASSTHROUGH_SIZE) {
GST_LOG_OBJECT (ogg,
"iterating through remaining window, because it's smaller than %u bytes",
SETUP_PASSTHROUGH_SIZE);
if (ogg->seek_to >= start) {
ogg->seek_skipped = 0;
if (!gst_ogg_demux_seek_before (ogg, start, start))
return FALSE;
}
} else {
ogg->seek_skipped = 0;
if (!gst_ogg_demux_seek_before (ogg, (start + end) / 2, start))
return FALSE;
}
return TRUE;
}
static gboolean
_find_chain_init (GstOggDemux * ogg)
{
gint64 start, end;
ogg->seek_skipped = 0;
ogg->seek_to = -1;
if (!_find_chain_get_unknown_part (ogg, &start, &end))
return FALSE;
if (!_find_chain_seek (ogg, start, end))
return FALSE;
return TRUE;
}
static gboolean
_find_chain_process (GstOggDemux * ogg, ogg_page * page)
{
GstOggPad *pad = gst_ogg_pad_get (ogg, page);
gint64 start, end;
if (!_find_chain_get_unknown_part (ogg, &start, &end))
return FALSE;
if (ogg->seek_to <= start && gst_ogg_demux_position (ogg) > end) {
/* we now should have the first bos page, because
* - we seeked to a point in the known chain
* - we're now in a part that belongs to the unordered streams
*/
g_assert (g_slist_find (ogg->unordered, pad));
if (!ogg_page_bos (page)) {
/* broken stream */
return FALSE;
}
if (!gst_ogg_demux_set_setup_state (ogg, SETUP_READ_BOS))
return FALSE;
return _read_bos_process (ogg, page);
} else {
if (!_find_chain_seek (ogg, start, end))
return FALSE;
}
return TRUE;
}
static gboolean
_find_streams_check (GstOggDemux * ogg)
{
gint chain_nr = ogg->setup_state == SETUP_FIND_END_OF_LAST_STREAMS ?
ogg->chains->len - 1 : ogg->chains->len - 2;
gint64 endpos;
/* figure out positions */
if (ogg->setup_state == SETUP_FIND_END_OF_LAST_STREAMS) {
if ((endpos = gst_file_pad_get_length (ogg->sinkpad)) < 0)
return FALSE;
} else {
endpos = G_MAXINT64;
FOR_PAD_IN_CHAIN (ogg, pad, ogg->chains->len - 1,
endpos = MIN (endpos, pad->start_offset););
}
if (!ogg->seek_skipped || gst_ogg_demux_position (ogg) >= endpos) {
/* have we found the endposition for all streams yet? */
FOR_PAD_IN_CHAIN (ogg, pad, chain_nr, if (!pad->end_offset)
goto go_on;);
/* get out, we're done */
ogg->seek_skipped = 0;
ogg->seek_to = -1;
if (ogg->unordered) {
ogg->setup_state = SETUP_FIND_END_OF_CHAIN;
} else {
gst_ogg_start_playing (ogg);
}
return TRUE;
go_on:
if (!gst_ogg_demux_seek_before (ogg, endpos, 0))
return FALSE;
}
return TRUE;
}
static gboolean
_find_streams_init (GstOggDemux * ogg)
{
ogg->seek_skipped = 0;
ogg->seek_to = -1;
return _find_streams_check (ogg);
}
static gboolean
_find_streams_process (GstOggDemux * ogg, ogg_page * page)
{
gint chain_nr = ogg->setup_state == SETUP_FIND_END_OF_LAST_STREAMS ?
ogg->chains->len - 1 : ogg->chains->len - 2;
g_assert (ogg->setup_state == SETUP_FIND_END_OF_LAST_STREAMS ||
ogg->setup_state == SETUP_FIND_END_OF_STREAMS);
g_assert (chain_nr >= 0);
/* mark current pad as having an endframe */
if (ogg->seek_skipped) {
GstOggPad *pad =
gst_ogg_pad_get_in_chain (ogg, chain_nr, ogg_page_serialno (page));
if (pad) {
pad->end_offset = TRUE;
g_print ("marking pad %d as having an end\n", pad->serial);
}
}
return _find_streams_check (ogg);
}
#undef GST_CAT_DEFAULT
#define GST_CAT_DEFAULT gst_ogg_demux_debug
static void
gst_ogg_demux_iterate (GstFilePad * pad)
{
GstOggDemux *ogg;
guint8 *data;
guint available;
int pageout_ret = 1;
gint64 offset_end;
ogg = GST_OGG_DEMUX (gst_pad_get_parent (GST_PAD (pad)));
available = gst_file_pad_available (ogg->sinkpad);
if (available == 0) {
if (gst_file_pad_eof (ogg->sinkpad)) {
gst_ogg_demux_eos (ogg);
} else {
GST_DEBUG_OBJECT (ogg, "no data available, doing nothing");
}
}
GST_LOG_OBJECT (ogg, "queueing next %u bytes of data", available);
data = (guint8 *) ogg_sync_buffer (&ogg->sync, available);
if ((available = gst_file_pad_read (ogg->sinkpad, data, available)) < 0) {
GST_ERROR_OBJECT (ogg, "error %u reading data from pad",
gst_file_pad_error (ogg->sinkpad));
return;
}
if (ogg_sync_wrote (&ogg->sync, available) != 0) {
GST_ELEMENT_ERROR (ogg, LIBRARY, TOO_LAZY, (NULL),
("ogg_sync_wrote failed"));
return;
}
offset_end = gst_file_pad_tell (ogg->sinkpad);
g_assert (offset_end >= 0); /* FIXME: do sth reasonable if no length available */
while (pageout_ret != 0) {
ogg_page page;
pageout_ret = ogg_sync_pageout (&ogg->sync, &page);
switch (pageout_ret) {
case -1:
/* FIXME: need some kind of discont here, we don't know any values to send though,
* we only have the END_OFFSET */
break;
case 0:
if (ogg->state == GST_OGG_STATE_SETUP) {
if (gst_file_pad_get_length (ogg->sinkpad) <= offset_end) {
if (ogg->seek_skipped) {
if (!gst_ogg_demux_seek_before (ogg,
gst_file_pad_get_length (ogg->sinkpad), 0))
abort_setup (ogg);
} else if (ogg->setup_state == SETUP_FIND_LAST_CHAIN) {
if (ogg->unordered) {
if (!gst_ogg_demux_seek_before (ogg, offset_end / 2, 0))
abort_setup (ogg);
if (!gst_ogg_demux_set_setup_state (ogg,
SETUP_FIND_END_OF_CHAIN))
goto out;
} else {
if (!gst_ogg_demux_set_setup_state (ogg,
SETUP_FIND_END_OF_LAST_STREAMS))
goto out;
}
} else {
abort_setup (ogg);
}
goto out;
}
}
break;
case 1:
GST_LOG_OBJECT (ogg,
"processing ogg page (serial %d, packet %ld, granule pos %llu",
ogg_page_serialno (&page), ogg_page_pageno (&page),
ogg_page_granulepos (&page));
switch (ogg->state) {
case GST_OGG_STATE_SETUP:
if (!setup_funcs[ogg->setup_state].process (ogg, &page)) {
abort_setup (ogg);
goto out;
}
break;
case GST_OGG_STATE_START:
if (gst_file_pad_seek (ogg->sinkpad, 0, GST_SEEK_METHOD_END) == 0) {
GST_OGG_SET_STATE (ogg, GST_OGG_STATE_SETUP);
GST_DEBUG_OBJECT (ogg, "stream can seek, try setup now");
if (gst_file_pad_seek (ogg->sinkpad, 0, GST_SEEK_METHOD_SET) != 0) {
GST_ELEMENT_ERROR (ogg, CORE, SEEK, (NULL),
("stream can seek to end, but not to start. Can't handle that."));
}
ogg_sync_clear (&ogg->sync);
gst_ogg_add_chain (ogg);
GST_FLAG_SET (ogg, GST_OGG_FLAG_WAIT_FOR_DISCONT);
goto out;
}
gst_ogg_add_chain (ogg);
GST_OGG_SET_STATE (ogg, GST_OGG_STATE_PLAY);
/* fall through */
case GST_OGG_STATE_SEEK:
case GST_OGG_STATE_PLAY:
gst_ogg_demux_push (ogg, &page);
break;
default:
g_assert_not_reached ();
break;
}
break;
default:
GST_WARNING_OBJECT (ogg,
"unknown return value %d from ogg_sync_pageout", pageout_ret);
pageout_ret = 0;
break;
}
}
out:
return;
}
static GstOggPad *
gst_ogg_pad_new (GstOggDemux * ogg, int serial)
{
GstOggPad *ret = g_new0 (GstOggPad, 1);
GstTagList *list = gst_tag_list_new ();
ret->serial = serial;
if (ogg_stream_init (&ret->stream, serial) != 0) {
GST_ERROR_OBJECT (ogg,
"Could not initialize ogg_stream struct for serial %d.", serial);
g_free (ret);
return NULL;
}
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, GST_TAG_SERIAL, serial, NULL);
gst_element_found_tags (GST_ELEMENT (ogg), list);
GST_LOG_OBJECT (ogg, "created new ogg src %p for stream with serial %d", ret,
serial);
ret->start_offset = ret->end_offset = -1;
ret->start_found = ret->end_found = FALSE;
return ret;
}
static void
gst_ogg_pad_remove (GstOggDemux * ogg, GstOggPad * pad)
{
if (pad->pad) {
/* FIXME:
* we do it in the EOS signal already - EOS handling needs to be better thought out.
* Correct way would be pushing EOS on eos page, but scheduler doesn't like that
if (GST_PAD_IS_USEABLE (pad->pad))
gst_pad_push (pad->pad, GST_DATA (gst_event_new (GST_EVENT_EOS)));
*/
gst_element_remove_pad (GST_ELEMENT (ogg), pad->pad);
}
if (ogg_stream_clear (&pad->stream) != 0)
GST_ERROR_OBJECT (ogg,
"ogg_stream_clear (serial %d) did not return 0, ignoring this error",
pad->serial);
GST_LOG_OBJECT (ogg, "free ogg src %p for stream with serial %d", pad,
pad->serial);
g_free (pad);
}
static void
gst_ogg_demux_push (GstOggDemux * ogg, ogg_page * page)
{
GstOggPad *cur =
gst_ogg_pad_get_in_current_chain (ogg, ogg_page_serialno (page));
/* now we either have a stream (cur) or not */
if (ogg_page_bos (page)) {
if (cur) {
GST_DEBUG_OBJECT (ogg,
"ogg page declared as BOS while stream %d already existed."
"Possibly a seek happened.", cur->serial);
} else if (cur) {
GST_DEBUG_OBJECT (ogg, "reactivating deactivated stream %d.",
cur->serial);
} else {
/* FIXME: monitor if we are still in creation stage? */
cur = gst_ogg_pad_new (ogg, ogg_page_serialno (page));
if (!cur) {
GST_ELEMENT_ERROR (ogg, LIBRARY, TOO_LAZY, (NULL),
("Creating ogg_stream struct failed."));
return;
}
if (ogg->current_chain == -1) {
/* add new one at the end */
gst_ogg_add_chain (ogg);
}
CURRENT_CHAIN (ogg)->pads =
g_slist_prepend (CURRENT_CHAIN (ogg)->pads, cur);
}
ogg->bos = TRUE;
} else if (ogg->bos) {
gst_element_no_more_pads (GST_ELEMENT (ogg));
ogg->bos = FALSE;
}
if (cur == NULL) {
GST_ELEMENT_ERROR (ogg, STREAM, DECODE, (NULL),
("invalid ogg stream serial no"));
return;
}
if (ogg_stream_pagein (&cur->stream, page) != 0) {
GST_WARNING_OBJECT (ogg,
"ogg stream choked on page (serial %d), resetting stream", cur->serial);
gst_ogg_pad_reset (ogg, cur);
return;
}
switch (ogg->state) {
case GST_OGG_STATE_SEEK:
GST_LOG_OBJECT (ogg,
"in seek - offset now: %" G_GUINT64_FORMAT
" (pad %d) - desired offset %" G_GUINT64_FORMAT " (pad %d)",
cur->known_offset, cur->serial, ogg->seek_to, ogg->seek_pad->serial);
if (cur == ogg->seek_pad) {
gint64 position;
position = ogg_page_granulepos (page);
/* see if we reached the destination position when seeking */
if (ogg->seek_format != GST_FORMAT_DEFAULT) {
if (!gst_pad_convert (GST_PAD_PEER (cur->pad),
GST_FORMAT_DEFAULT, position, &ogg->seek_format, &position)) {
/* let's just stop then */
position = G_MAXINT64;
}
}
if (position >= ogg->seek_to) {
GST_OGG_SET_STATE (ogg, GST_OGG_STATE_PLAY);
GST_DEBUG_OBJECT (ogg,
"ended seek at offset %" G_GUINT64_FORMAT " (requested %"
G_GUINT64_FORMAT, cur->known_offset, ogg->seek_to);
ogg->seek_pad = NULL;
ogg->seek_to = 0;
}
}
/* fallthrough */
case GST_OGG_STATE_PLAY:
cur->known_offset = ogg_page_granulepos (page);
gst_ogg_pad_push (ogg, cur);
break;
default:
g_assert_not_reached ();
break;
}
if (ogg_page_eos (page)) {
GST_DEBUG_OBJECT (ogg, "got EOS for stream with serial %d, sending EOS now",
cur->serial);
#if 0
/* Removing pads while PLAYING doesn't work with current schedulers */
/* remove from list, as this will never be called again */
gst_ogg_pad_remove (ogg, cur);
/* this is also not possible because sending EOS this way confuses the scheduler */
gst_pad_push (cur->pad, GST_DATA (gst_event_new (GST_EVENT_EOS)));
#endif
}
}
static void
gst_ogg_pad_push (GstOggDemux * ogg, GstOggPad * pad)
{
ogg_packet packet;
int ret;
GstBuffer *buf;
while (TRUE) {
ret = ogg_stream_packetout (&pad->stream, &packet);
switch (ret) {
case 0:
return;
case -1:
gst_ogg_pad_reset (ogg, pad);
break;
case 1:{
/* only push data when playing, not during seek or similar */
if (ogg->state != GST_OGG_STATE_PLAY)
continue;
if (!pad->pad) {
GstCaps *caps = gst_ogg_type_find (&packet);
gchar *name = g_strdup_printf ("serial_%d", pad->serial);
if (caps == NULL) {
GST_WARNING_OBJECT (ogg,
"couldn't find caps for stream with serial %d", pad->serial);
caps = gst_caps_new_simple ("application/octet-stream", NULL);
}
pad->pad =
gst_pad_new_from_template (gst_static_pad_template_get
(&ogg_demux_src_template_factory), name);
g_free (name);
gst_pad_set_event_function (pad->pad,
GST_DEBUG_FUNCPTR (gst_ogg_demux_src_event));
gst_pad_set_event_mask_function (pad->pad,
GST_DEBUG_FUNCPTR (gst_ogg_demux_get_event_masks));
gst_pad_set_query_function (pad->pad,
GST_DEBUG_FUNCPTR (gst_ogg_demux_src_query));
gst_pad_set_query_type_function (pad->pad,
GST_DEBUG_FUNCPTR (gst_ogg_demux_get_query_types));
gst_pad_set_formats_function (pad->pad,
GST_DEBUG_FUNCPTR (gst_ogg_demux_get_formats));
gst_pad_set_convert_function (pad->pad,
GST_DEBUG_FUNCPTR (gst_ogg_demux_src_convert));
gst_pad_use_explicit_caps (pad->pad);
gst_pad_set_explicit_caps (pad->pad, caps);
gst_pad_set_active (pad->pad, TRUE);
gst_element_add_pad (GST_ELEMENT (ogg), pad->pad);
}
/* check for discont */
if (packet.packetno != pad->packetno++) {
pad->flags |= GST_OGG_PAD_NEEDS_DISCONT;
pad->packetno = packet.packetno + 1;
}
/* send discont if needed */
if ((pad->flags & GST_OGG_PAD_NEEDS_DISCONT)
&& GST_PAD_IS_USABLE (pad->pad)) {
GstEvent *event = gst_event_new_discontinuous (FALSE,
GST_FORMAT_DEFAULT, pad->known_offset, GST_FORMAT_UNDEFINED); /* FIXME: this might be wrong because we can only use the last known offset */
gst_pad_push (pad->pad, GST_DATA (event));
pad->flags &= (~GST_OGG_PAD_NEEDS_DISCONT);
};
/* optimization: use a bufferpool containing the ogg packet? */
buf =
gst_pad_alloc_buffer (pad->pad, GST_BUFFER_OFFSET_NONE,
packet.bytes);
memcpy (buf->data, packet.packet, packet.bytes);
if (pad->offset != -1)
GST_BUFFER_OFFSET (buf) = pad->offset;
if (packet.granulepos != -1)
GST_BUFFER_OFFSET_END (buf) = packet.granulepos;
pad->offset = packet.granulepos;
if (GST_PAD_IS_USABLE (pad->pad))
gst_pad_push (pad->pad, GST_DATA (buf));
break;
}
default:
GST_ERROR_OBJECT (ogg,
"invalid return value %d for ogg_stream_packetout, resetting stream",
ret);
gst_ogg_pad_reset (ogg, pad);
break;
}
}
}
static void
gst_ogg_pad_reset (GstOggDemux * ogg, GstOggPad * pad)
{
ogg_stream_reset (&pad->stream);
pad->offset = GST_BUFFER_OFFSET_NONE;
/* FIXME: need a discont here */
}
static void
gst_ogg_chains_clear (GstOggDemux * ogg)
{
gint i;
GSList *walk;
for (i = ogg->chains->len - 1; i >= 0; i--) {
GstOggChain *cur = &g_array_index (ogg->chains, GstOggChain, i);
for (walk = cur->pads; walk; walk = g_slist_next (walk)) {
gst_ogg_pad_remove (ogg, (GstOggPad *) walk->data);
}
g_slist_free (cur->pads);
g_array_remove_index (ogg->chains, i);
}
ogg->current_chain = -1;
}
static GstElementStateReturn
gst_ogg_demux_change_state (GstElement * element)
{
GstOggDemux *ogg;
ogg = GST_OGG_DEMUX (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
ogg_sync_init (&ogg->sync);
break;
case GST_STATE_READY_TO_PAUSED:
ogg_sync_reset (&ogg->sync);
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
gst_ogg_chains_clear (ogg);
GST_OGG_SET_STATE (ogg, GST_OGG_STATE_START);
ogg->seek_pad = NULL;
ogg->seek_to = 0;
break;
case GST_STATE_READY_TO_NULL:
ogg_sync_clear (&ogg->sync);
break;
default:
break;
}
return parent_class->change_state (element);
}
/*** typefinding **************************************************************/
/* ogg supports its own typefinding because the ogg spec defines that the first
* packet of an ogg stream must identify the stream. Therefore ogg can use a
* simplified approach at typefinding.
*/
typedef struct
{
ogg_packet *packet;
guint best_probability;
GstCaps *caps;
}
OggTypeFind;
static guint8 *
ogg_find_peek (gpointer data, gint64 offset, guint size)
{
OggTypeFind *find = (OggTypeFind *) data;
if (offset + size <= find->packet->bytes) {
return ((guint8 *) find->packet->packet) + offset;
} else {
return NULL;
}
}
static void
ogg_find_suggest (gpointer data, guint probability, const GstCaps * caps)
{
OggTypeFind *find = (OggTypeFind *) data;
if (probability > find->best_probability) {
gst_caps_replace (&find->caps, gst_caps_copy (caps));
find->best_probability = probability;
}
}
static GstCaps *
gst_ogg_type_find (ogg_packet * packet)
{
GstTypeFind gst_find;
OggTypeFind find;
GList *walk, *type_list = NULL;
walk = type_list = gst_type_find_factory_get_list ();
find.packet = packet;
find.best_probability = 0;
find.caps = NULL;
gst_find.data = &find;
gst_find.peek = ogg_find_peek;
gst_find.suggest = ogg_find_suggest;
while (walk) {
GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
gst_type_find_factory_call_function (factory, &gst_find);
if (find.best_probability >= GST_TYPE_FIND_MAXIMUM)
break;
walk = g_list_next (walk);
}
if (find.best_probability > 0)
return find.caps;
return NULL;
}
gboolean
gst_ogg_demux_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_ogg_demux_debug, "oggdemux", 0, "ogg demuxer");
GST_DEBUG_CATEGORY_INIT (gst_ogg_demux_setup_debug, "oggdemux_setup", 0,
"ogg demuxer setup stage when parsing pipeline");
return gst_element_register (plugin, "oggdemux", GST_RANK_PRIMARY,
GST_TYPE_OGG_DEMUX);
}
/* prints all info about the element */
#undef GST_CAT_DEFAULT
#define GST_CAT_DEFAULT gst_ogg_demux_setup_debug
#if 0
/* use a define here so the function name in debugging output stays the same */
static void
gst_ogg_print_pad (GstOggDemux * ogg, GstOggPad * pad)
#endif
#define gst_ogg_print_pad(ogg, _pad) \
G_STMT_START{\
GstOggPad *pad = (_pad); \
GST_INFO_OBJECT (ogg, " stream %d:", pad->serial); \
GST_INFO_OBJECT (ogg, " length %" G_GUINT64_FORMAT, pad->length); \
GST_INFO_OBJECT (ogg, " pages %ld", pad->pages); \
GST_INFO_OBJECT (ogg, " offset: %"G_GINT64_FORMAT"%s - %"G_GINT64_FORMAT"%s", \
pad->start_offset, pad->start_found ? "" : " (?)", \
pad->end_offset, pad->end_found ? "" : " (?)"); \
}G_STMT_END
static void gst_ogg_print (GstOggDemux * ogg)
{
guint i;
GSList *walk;
for (i = 0; i < ogg->chains->len; i++) {
GstOggChain *chain = &g_array_index (ogg->chains, GstOggChain, i);
GST_INFO_OBJECT (ogg, "chain %d (%u streams):", i,
g_slist_length (chain->pads));
for (walk = chain->pads; walk; walk = g_slist_next (walk)) {
gst_ogg_print_pad (ogg, walk->data);
}
}
if (ogg->unordered) {
GST_INFO_OBJECT (ogg, "unordered (%u streams):", i,
g_slist_length (ogg->unordered));
for (walk = ogg->unordered; walk; walk = g_slist_next (walk)) {
gst_ogg_print_pad (ogg, walk->data);
}
}
}
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