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gstreamer/ext/ogg/gstoggmux.c
Michael Smith 6f1277ab13 ext/ogg/gstoggmux.c: Forward port rewrite of muxing strategy to 0.9 version of oggmux. 
Original commit message from CVS:
* ext/ogg/gstoggmux.c: (gst_ogg_mux_request_new_pad),
(gst_ogg_mux_buffer_from_page), (gst_ogg_mux_push_buffer),
(gst_ogg_mux_dequeue_page), (gst_ogg_mux_pad_queue_page),
(gst_ogg_mux_send_headers), (gst_ogg_mux_collected):
Forward port rewrite of muxing strategy to 0.9 version of oggmux.
This makes us mux things correctly according to the ogg muxing
rules. Still not handling EOS correctly right now, though.
2005-11-08 16:37:32 +00:00

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/* OGG muxer plugin for GStreamer
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* 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/base/gstcollectpads.h>
#include <ogg/ogg.h>
/* memcpy - if someone knows a way to get rid of it, please speak up
* note: the ogg docs even say you need this... */
#include <string.h>
#include <time.h>
GST_DEBUG_CATEGORY_STATIC (gst_ogg_mux_debug);
#define GST_CAT_DEFAULT gst_ogg_mux_debug
#define GST_TYPE_OGG_MUX (gst_ogg_mux_get_type())
#define GST_OGG_MUX(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OGG_MUX, GstOggMux))
#define GST_OGG_MUX_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OGG_MUX, GstOggMux))
#define GST_IS_OGG_MUX(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OGG_MUX))
#define GST_IS_OGG_MUX_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OGG_MUX))
#define GST_GP_FORMAT "[gp %8" G_GINT64_FORMAT "]"
typedef struct _GstOggMux GstOggMux;
typedef struct _GstOggMuxClass GstOggMuxClass;
typedef enum
{
GST_OGG_PAD_STATE_CONTROL = 0,
GST_OGG_PAD_STATE_DATA = 1
}
GstOggPadState;
/* all information needed for one ogg stream */
typedef struct
{
GstCollectData collect; /* we extend the CollectData */
GstBuffer *buffer; /* the queued buffer for this pad */
gint serial;
ogg_stream_state stream;
gint64 packetno; /* number of next packet */
gint64 pageno; /* number of next page */
guint64 duration; /* duration of current page */
gboolean eos;
gint64 offset;
GstClockTime timestamp; /* timestamp for granulepos of last complete
packet on this page */
GstOggPadState state; /* state of the pad */
GList *headers;
GQueue *pagebuffers; /* List of pages in buffers ready for pushing */
gboolean new_page; /* starting a new page */
gboolean first_delta; /* was the first packet in the page a delta */
gboolean prev_delta; /* was the previous buffer a delta frame */
}
GstOggPad;
struct _GstOggMux
{
GstElement element;
/* source pad */
GstPad *srcpad;
/* sinkpads */
GstCollectPads *collect;
/* the pad we are currently using to fill a page */
GstOggPad *pulling;
/* next timestamp for the page */
GstClockTime next_ts;
/* offset in stream */
guint64 offset;
/* need_headers */
gboolean need_headers;
guint64 max_delay;
guint64 max_page_delay;
GstOggPad *delta_pad; /* when a delta frame is detected on a stream, we mark
pages as delta frames up to the page that has the
keyframe */
};
typedef enum
{
GST_OGG_FLAG_BOS = GST_ELEMENT_FLAG_LAST,
GST_OGG_FLAG_EOS
}
GstOggFlag;
struct _GstOggMuxClass
{
GstElementClass parent_class;
};
/* elementfactory information */
static GstElementDetails gst_ogg_mux_details = GST_ELEMENT_DETAILS ("ogg muxer",
"Codec/Muxer",
"mux ogg streams (info about ogg: http://xiph.org)",
"Wim Taymans <wim@fluendo.com>");
/* OggMux signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
/* set to 0.5 seconds by default */
#define DEFAULT_MAX_DELAY G_GINT64_CONSTANT(500000000)
#define DEFAULT_MAX_PAGE_DELAY G_GINT64_CONSTANT(500000000)
enum
{
ARG_0,
ARG_MAX_DELAY,
ARG_MAX_PAGE_DELAY,
};
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/ogg")
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/x-theora; "
"audio/x-vorbis; audio/x-flac; audio/x-speex; "
"application/x-ogm-video; application/x-ogm-audio")
);
static void gst_ogg_mux_base_init (gpointer g_class);
static void gst_ogg_mux_class_init (GstOggMuxClass * klass);
static void gst_ogg_mux_init (GstOggMux * ogg_mux);
static GstFlowReturn
gst_ogg_mux_collected (GstCollectPads * pads, GstOggMux * ogg_mux);
static gboolean gst_ogg_mux_handle_src_event (GstPad * pad, GstEvent * event);
static GstPad *gst_ogg_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name);
static void gst_ogg_mux_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_ogg_mux_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_ogg_mux_change_state (GstElement * element,
GstStateChange transition);
static GstElementClass *parent_class = NULL;
/*static guint gst_ogg_mux_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_ogg_mux_get_type (void)
{
static GType ogg_mux_type = 0;
if (!ogg_mux_type) {
static const GTypeInfo ogg_mux_info = {
sizeof (GstOggMuxClass),
gst_ogg_mux_base_init,
NULL,
(GClassInitFunc) gst_ogg_mux_class_init,
NULL,
NULL,
sizeof (GstOggMux),
0,
(GInstanceInitFunc) gst_ogg_mux_init,
};
ogg_mux_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstOggMux", &ogg_mux_info,
0);
}
return ogg_mux_type;
}
static void
gst_ogg_mux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details (element_class, &gst_ogg_mux_details);
}
static void
gst_ogg_mux_class_init (GstOggMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->get_property = gst_ogg_mux_get_property;
gobject_class->set_property = gst_ogg_mux_set_property;
gstelement_class->request_new_pad = gst_ogg_mux_request_new_pad;
g_object_class_install_property (gobject_class, ARG_MAX_DELAY,
g_param_spec_uint64 ("max-delay", "Max delay",
"Maximum delay in multiplexing streams", 0, G_MAXUINT64,
DEFAULT_MAX_DELAY, (GParamFlags) G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MAX_PAGE_DELAY,
g_param_spec_uint64 ("max-page-delay", "Max page delay",
"Maximum delay for sending out a page", 0, G_MAXUINT64,
DEFAULT_MAX_PAGE_DELAY, (GParamFlags) G_PARAM_READWRITE));
gstelement_class->change_state = gst_ogg_mux_change_state;
}
#if 0
static const GstEventMask *
gst_ogg_mux_get_sink_event_masks (GstPad * pad)
{
static const GstEventMask gst_ogg_mux_sink_event_masks[] = {
{GST_EVENT_EOS, 0},
{GST_EVENT_DISCONTINUOUS, 0},
{0,}
};
return gst_ogg_mux_sink_event_masks;
}
#endif
static void
gst_ogg_mux_init (GstOggMux * ogg_mux)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (ogg_mux);
ogg_mux->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_pad_set_event_function (ogg_mux->srcpad, gst_ogg_mux_handle_src_event);
gst_element_add_pad (GST_ELEMENT (ogg_mux), ogg_mux->srcpad);
GST_OBJECT_FLAG_SET (GST_ELEMENT (ogg_mux), GST_OGG_FLAG_BOS);
/* seed random number generator for creation of serial numbers */
srand (time (NULL));
ogg_mux->collect = gst_collectpads_new ();
gst_collectpads_set_function (ogg_mux->collect,
(GstCollectPadsFunction) gst_ogg_mux_collected, ogg_mux);
ogg_mux->pulling = NULL;
ogg_mux->need_headers = TRUE;
ogg_mux->max_delay = DEFAULT_MAX_DELAY;
ogg_mux->max_page_delay = DEFAULT_MAX_PAGE_DELAY;
ogg_mux->delta_pad = NULL;
}
static GstPadLinkReturn
gst_ogg_mux_sinkconnect (GstPad * pad, GstPad * peer)
{
GstOggMux *ogg_mux;
ogg_mux = GST_OGG_MUX (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (ogg_mux, "sinkconnect triggered on %s",
gst_pad_get_name (pad));
return GST_PAD_LINK_OK;
}
static GstPad *
gst_ogg_mux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name)
{
GstOggMux *ogg_mux;
GstPad *newpad;
GstElementClass *klass;
g_return_val_if_fail (templ != NULL, NULL);
if (templ->direction != GST_PAD_SINK)
goto wrong_direction;
g_return_val_if_fail (GST_IS_OGG_MUX (element), NULL);
ogg_mux = GST_OGG_MUX (element);
klass = GST_ELEMENT_GET_CLASS (element);
if (templ != gst_element_class_get_pad_template (klass, "sink_%d"))
goto wrong_template;
{
gint serial;
gchar *name;
if (req_name == NULL || strlen (req_name) < 6) {
/* no name given when requesting the pad, use random serial number */
serial = rand ();
} else {
/* parse serial number from requested padname */
serial = atoi (&req_name[5]);
}
/* create new pad with the name */
name = g_strdup_printf ("sink_%d", serial);
newpad = gst_pad_new_from_template (templ, name);
g_free (name);
/* construct our own wrapper data structure for the pad to
* keep track of its status */
{
GstOggPad *oggpad;
oggpad = (GstOggPad *)
gst_collectpads_add_pad (ogg_mux->collect, newpad,
sizeof (GstOggPad));
oggpad->serial = serial;
ogg_stream_init (&oggpad->stream, serial);
oggpad->packetno = 0;
oggpad->pageno = 0;
oggpad->eos = FALSE;
/* we assume there will be some control data first for this pad */
oggpad->state = GST_OGG_PAD_STATE_CONTROL;
oggpad->new_page = TRUE;
oggpad->first_delta = FALSE;
oggpad->prev_delta = FALSE;
/* TODO: delete this queue (and the things contained within) later,
* possibly when doing gst_collectpads_remove_pad() (which we don't seem
* to do at all?)
*/
oggpad->pagebuffers = g_queue_new ();
}
}
/* setup some pad functions */
gst_pad_set_link_function (newpad, gst_ogg_mux_sinkconnect);
/* dd the pad to the element */
gst_element_add_pad (element, newpad);
return newpad;
/* ERRORS */
wrong_direction:
{
g_warning ("ogg_mux: request pad that is not a SINK pad\n");
return NULL;
}
wrong_template:
{
g_warning ("ogg_mux: this is not our template!\n");
return NULL;
}
}
/* handle events */
static gboolean
gst_ogg_mux_handle_src_event (GstPad * pad, GstEvent * event)
{
GstOggMux *ogg_mux;
GstEventType type;
ogg_mux = GST_OGG_MUX (gst_pad_get_parent (pad));
type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
switch (type) {
case GST_EVENT_SEEK:
/* disable seeking for now */
return FALSE;
default:
break;
}
return gst_pad_event_default (pad, event);
}
#if 0
static GstBuffer *
gst_ogg_mux_next_buffer (GstOggPad * pad, gboolean * interrupt)
{
GstData *data = NULL;
GstBuffer *buffer = NULL;
while (buffer == NULL) {
//gst_pad_pull (pad->pad, &buffer);
GST_DEBUG ("muxer: pulled %s:%s %p", GST_DEBUG_PAD_NAME (pad->pad), data);
/* if it's an event, handle it */
if (GST_IS_EVENT (data)) {
GstEventType type;
GstOggMux *ogg_mux;
GstEvent *event = GST_EVENT (data);
ogg_mux = GST_OGG_MUX (gst_pad_get_parent (pad->pad));
type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
switch (type) {
case GST_EVENT_EOS:
pad->eos = TRUE;
gst_event_unref (event);
return NULL;
case GST_EVENT_DISCONTINUOUS:
{
guint64 start_value, end_value;
if (gst_event_discont_get_value (event, GST_FORMAT_TIME,
&start_value, &end_value)) {
GST_DEBUG_OBJECT (ogg_mux,
"got discont of %" G_GUINT64_FORMAT " and %" G_GUINT64_FORMAT
" on pad %s:%s", start_value, end_value,
GST_DEBUG_PAD_NAME (pad->pad));
}
pad->offset = start_value;
gst_event_unref (event);
}
break;
default:
gst_pad_event_default (pad->pad, event);
break;
}
data = NULL;
} else {
GstBuffer *buf = GST_BUFFER (data);
gboolean incaps;
incaps = GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_IN_CAPS);
/* if we need headers */
if (pad->state == GST_OGG_PAD_STATE_CONTROL) {
/* and we have one */
if (incaps) {
GST_DEBUG ("muxer: got incaps buffer in control state, ignoring");
/* just ignore */
gst_buffer_unref (buf);
/* pull next one in next iteration */
data = NULL;
} else {
GST_DEBUG
("muxer: got data buffer in control state, switching to data mode");
/* this is a data buffer so switch to data state */
pad->state = GST_OGG_PAD_STATE_DATA;
}
}
}
}
return GST_BUFFER (data);
}
#endif
static GstBuffer *
gst_ogg_mux_buffer_from_page (GstOggMux * mux, ogg_page * page, gboolean delta)
{
GstBuffer *buffer;
/* allocate space for header and body */
buffer = gst_buffer_new_and_alloc (page->header_len + page->body_len);
memcpy (GST_BUFFER_DATA (buffer), page->header, page->header_len);
memcpy (GST_BUFFER_DATA (buffer) + page->header_len,
page->body, page->body_len);
/* next_ts was the timestamp of the first buffer put in this page */
GST_BUFFER_TIMESTAMP (buffer) = mux->next_ts;
GST_BUFFER_OFFSET (buffer) = mux->offset;
mux->offset += GST_BUFFER_SIZE (buffer);
/* Here we set granulepos as our OFFSET_END to give easy direct access to
* this value later. Before we push it, we reset this to OFFSET + SIZE
* (see gst_ogg_mux_push_buffer). */
GST_BUFFER_OFFSET_END (buffer) = ogg_page_granulepos (page);
if (delta)
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
return buffer;
}
static GstFlowReturn
gst_ogg_mux_push_buffer (GstOggMux * mux, GstBuffer * buffer)
{
GST_BUFFER_OFFSET_END (buffer) = GST_BUFFER_OFFSET (buffer) +
GST_BUFFER_SIZE (buffer);
return gst_pad_push (mux->srcpad, buffer);
}
/* if all queues have at least one page, dequeue the page with the lowest
* timestamp */
static gboolean
gst_ogg_mux_dequeue_page (GstOggMux * mux, GstFlowReturn * flowret)
{
GSList *walk;
GstOggPad *opad = NULL; /* "oldest" pad */
GstClockTime oldest = GST_CLOCK_TIME_NONE;
GstBuffer *buf = NULL;
gboolean ret = FALSE;
*flowret = GST_FLOW_OK;
walk = mux->collect->data;
while (walk) {
GstOggPad *pad = (GstOggPad *) walk->data;
/* We need each queue to either be at EOS, or have one or more pages
* available with a set granulepos (i.e. not -1), otherwise we don't have
* enough data yet to determine which stream needs to go next for correct
* time ordering. */
if (pad->pagebuffers->length == 0) {
if (pad->eos) {
GST_LOG_OBJECT (pad, "pad is EOS, skipping for dequeue decision");
} else {
GST_LOG_OBJECT (pad, "no pages in this queue, can't dequeue");
return FALSE;
}
} else {
/* We then need to check for a non-negative granulepos */
int i;
gboolean valid = FALSE;
for (i = 0; i < pad->pagebuffers->length; i++) {
buf = g_queue_peek_nth (pad->pagebuffers, i);
/* Here we check the OFFSET_END, which is actually temporarily the
* granulepos value for this buffer */
if (GST_BUFFER_OFFSET_END (buf) != -1) {
valid = TRUE;
break;
}
}
if (!valid) {
GST_LOG_OBJECT (pad, "No page timestamps in queue, can't dequeue");
return FALSE;
}
}
walk = g_slist_next (walk);
}
walk = mux->collect->data;
while (walk) {
GstOggPad *pad = (GstOggPad *) walk->data;
/* any page with a granulepos of -1 can be pushed immediately.
* TODO: it CAN be, but it seems silly to do so? */
buf = g_queue_peek_head (pad->pagebuffers);
while (buf && GST_BUFFER_OFFSET_END (buf) == -1) {
GST_LOG_OBJECT (pad, GST_GP_FORMAT " pushing page", -1);
g_queue_pop_head (pad->pagebuffers);
*flowret = gst_ogg_mux_push_buffer (mux, buf);
buf = g_queue_peek_head (pad->pagebuffers);
ret = TRUE;
}
if (buf) {
/* if no oldest buffer yet, take this one */
if (oldest == GST_CLOCK_TIME_NONE) {
oldest = GST_BUFFER_TIMESTAMP (buf);
opad = pad;
} else {
/* if we have an oldest, compare with this one */
if (GST_BUFFER_TIMESTAMP (buf) < oldest) {
oldest = GST_BUFFER_TIMESTAMP (buf);
opad = pad;
}
}
}
walk = g_slist_next (walk);
}
if (oldest != GST_CLOCK_TIME_NONE) {
g_assert (opad);
buf = g_queue_pop_head (opad->pagebuffers);
GST_LOG_OBJECT (opad,
GST_GP_FORMAT " pushing oldest page (time %" GST_TIME_FORMAT ")",
GST_BUFFER_OFFSET_END (buf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
*flowret = gst_ogg_mux_push_buffer (mux, buf);
ret = TRUE;
}
return ret;
}
/* put the given page on a per-pad queue, timestamping it correctly.
* after that, dequeue and push as many pages as possible
* before calling me, make sure that the the pad's timestamp matches
* the page's granulepos */
static GstFlowReturn
gst_ogg_mux_pad_queue_page (GstOggMux * mux, GstOggPad * pad, ogg_page * page,
gboolean delta)
{
GstBuffer *buffer = gst_ogg_mux_buffer_from_page (mux, page, delta);
GstFlowReturn ret;
/* take the timestamp of the last completed packet on this page */
GST_BUFFER_TIMESTAMP (buffer) = pad->timestamp;
g_queue_push_tail (pad->pagebuffers, buffer);
GST_LOG_OBJECT (pad, GST_GP_FORMAT " queued buffer page (time %" GST_TIME_FORMAT "), %d page buffers queued", ogg_page_granulepos (page), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)), pad->pagebuffers->length); /* no g_queue_get_length in 2.2 */
while (gst_ogg_mux_dequeue_page (mux, &ret)) {
if (ret != GST_FLOW_OK)
break;
}
return ret;
}
/*
* Given two pads, compare the buffers queued on it and return 0 if they have
* an equal priority, 1 if the new pad is better, -1 if the old pad is better
*/
static gint
gst_ogg_mux_compare_pads (GstOggMux * ogg_mux, GstOggPad * old, GstOggPad * new)
{
guint64 oldtime, newtime;
/* if the old pad doesn't contain anything or is even NULL, return
* the new pad as best candidate and vice versa */
if (old == NULL || old->buffer == NULL)
return 1;
if (new == NULL || new->buffer == NULL)
return -1;
/* no timestamp on old buffer, it must go first */
oldtime = GST_BUFFER_TIMESTAMP (old->buffer);
if (oldtime == GST_CLOCK_TIME_NONE)
return -1;
/* no timestamp on new buffer, it must go first */
newtime = GST_BUFFER_TIMESTAMP (new->buffer);
if (newtime == GST_CLOCK_TIME_NONE)
return 1;
/* old buffer has higher timestamp, new one should go first */
if (newtime < oldtime)
return 1;
/* new buffer has higher timestamp, old one should go first */
else if (newtime > oldtime)
return -1;
else {
/* buffers with equal timestamps, prefer the pad that has the
* least number of pages muxed */
if (new->pageno < old->pageno)
return 1;
else if (new->pageno > old->pageno)
return -1;
}
/* same priority if all of the above failed */
return 0;
}
/* make sure a buffer is queued on all pads, returns a pointer to an oggpad
* that holds the best buffer or NULL when no pad was usable.
* "best" means the buffer marked with the lowest timestamp */
static GstOggPad *
gst_ogg_mux_queue_pads (GstOggMux * ogg_mux)
{
GstOggPad *bestpad = NULL, *still_hungry = NULL;
GSList *walk;
/* try to make sure we have a buffer from each usable pad first */
walk = ogg_mux->collect->data;
while (walk) {
GstOggPad *pad;
GstCollectData *data;
data = (GstCollectData *) walk->data;
pad = (GstOggPad *) data;
walk = g_slist_next (walk);
/* try to get a new buffer for this pad if needed and possible */
if (pad->buffer == NULL) {
GstBuffer *buf;
gboolean incaps;
buf = gst_collectpads_pop (ogg_mux->collect, data);
/* On EOS we get a NULL buffer */
if (buf != NULL) {
incaps = GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_IN_CAPS);
/* if we need headers */
if (pad->state == GST_OGG_PAD_STATE_CONTROL) {
/* and we have one */
if (incaps) {
GST_DEBUG ("muxer: got incaps buffer in control state, ignoring");
/* just ignore */
gst_buffer_unref (buf);
buf = NULL;
} else {
GST_DEBUG ("muxer: got data buffer in control state, switching "
"to data mode");
/* this is a data buffer so switch to data state */
pad->state = GST_OGG_PAD_STATE_DATA;
}
}
}
pad->buffer = buf;
}
/* we should have a buffer now, see if it is the best pad to
* pull on */
if (pad->buffer) {
if (gst_ogg_mux_compare_pads (ogg_mux, bestpad, pad) > 0)
bestpad = pad;
} else {
still_hungry = pad;
}
}
if (still_hungry)
/* drop back into collectpads... */
return still_hungry;
else
return bestpad;
}
static GList *
gst_ogg_mux_get_headers (GstOggPad * pad)
{
GList *res = NULL;
GstOggMux *ogg_mux;
GstStructure *structure;
const GstCaps *caps;
GstPad *thepad;
thepad = pad->collect.pad;
ogg_mux = GST_OGG_MUX (GST_PAD_PARENT (thepad));
GST_LOG ("getting headers from pad %s:%s", GST_DEBUG_PAD_NAME (thepad));
caps = gst_pad_get_negotiated_caps (thepad);
if (caps != NULL) {
const GValue *streamheader;
structure = gst_caps_get_structure (caps, 0);
streamheader = gst_structure_get_value (structure, "streamheader");
if (streamheader != NULL) {
GST_LOG ("got header");
if (G_VALUE_TYPE (streamheader) == GST_TYPE_ARRAY) {
GArray *bufarr = g_value_peek_pointer (streamheader);
gint i;
GST_LOG ("got fixed list");
for (i = 0; i < bufarr->len; i++) {
GValue *bufval = &g_array_index (bufarr, GValue, i);
GST_LOG ("item %d", i);
if (G_VALUE_TYPE (bufval) == GST_TYPE_BUFFER) {
GstBuffer *buf = g_value_peek_pointer (bufval);
GST_LOG ("adding item %d to header list", i);
gst_buffer_ref (buf);
res = g_list_append (res, buf);
}
}
} else {
GST_LOG ("streamheader is not fixed list");
}
} else {
GST_LOG ("caps done have streamheader");
}
} else {
GST_LOG ("got empty caps as negotiated format");
}
return res;
}
static GstCaps *
gst_ogg_mux_set_header_on_caps (GstCaps * caps, GList * buffers)
{
GstStructure *structure;
GValue list = { 0 };
GList *walk = buffers;
caps = gst_caps_make_writable (caps);
structure = gst_caps_get_structure (caps, 0);
/* put buffers in a fixed list */
g_value_init (&list, GST_TYPE_ARRAY);
while (walk) {
GstBuffer *buf = GST_BUFFER (walk->data);
GValue value = { 0 };
walk = walk->next;
/* mark buffer */
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_IN_CAPS);
g_value_init (&value, GST_TYPE_BUFFER);
gst_value_set_buffer (&value, buf);
gst_value_list_append_value (&list, &value);
g_value_unset (&value);
}
gst_structure_set_value (structure, "streamheader", &list);
g_value_unset (&list);
return caps;
}
/*
* For each pad we need to write out one (small) header in one
* page that allows decoders to identify the type of the stream.
* After that we need to write out all extra info for the decoders.
* In the case of a codec that also needs data as configuration, we can
* find that info in the streamcaps.
* After writing the headers we must start a new page for the data.
*/
static GstFlowReturn
gst_ogg_mux_send_headers (GstOggMux * mux)
{
GSList *walk;
GList *hbufs, *hwalk;
GstCaps *caps;
GstFlowReturn ret;
hbufs = NULL;
ret = GST_FLOW_OK;
GST_LOG ("collecting headers");
walk = mux->collect->data;
while (walk) {
GstOggPad *pad;
GstPad *thepad;
pad = (GstOggPad *) walk->data;
thepad = pad->collect.pad;
walk = g_slist_next (walk);
GST_LOG ("looking at pad %s:%s", GST_DEBUG_PAD_NAME (thepad));
/* if the pad has no buffer, we don't care */
if (pad->buffer == NULL)
continue;
/* now figure out the headers */
pad->headers = gst_ogg_mux_get_headers (pad);
}
GST_LOG ("creating first headers");
walk = mux->collect->data;
while (walk) {
GstOggPad *pad;
GstBuffer *buf;
ogg_packet packet;
ogg_page page;
GstPad *thepad;
pad = (GstOggPad *) walk->data;
thepad = pad->collect.pad;
walk = walk->next;
pad->packetno = 0;
GST_LOG ("looping over headers for pad %s:%s", GST_DEBUG_PAD_NAME (thepad));
if (pad->headers) {
buf = GST_BUFFER (pad->headers->data);
pad->headers = g_list_remove (pad->headers, buf);
} else if (pad->buffer) {
buf = pad->buffer;
gst_buffer_ref (buf);
} else {
/* fixme -- should be caught in the previous list traversal. */
GST_LOCK (pad);
g_critical ("No headers or buffers on pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
GST_UNLOCK (pad);
continue;
}
/* create a packet from the buffer */
packet.packet = GST_BUFFER_DATA (buf);
packet.bytes = GST_BUFFER_SIZE (buf);
packet.granulepos = GST_BUFFER_OFFSET_END (buf);
if (packet.granulepos == -1)
packet.granulepos = 0;
/* mark BOS and packet number */
packet.b_o_s = (pad->packetno == 0);
packet.packetno = pad->packetno++;
/* mark EOS */
packet.e_o_s = 0;
/* swap the packet in */
ogg_stream_packetin (&pad->stream, &packet);
gst_buffer_unref (buf);
GST_LOG ("flushing page with first packet");
while (ogg_stream_flush (&pad->stream, &page)) {
GstBuffer *hbuf = gst_ogg_mux_buffer_from_page (mux, &page, FALSE);
GST_LOG ("swapped out page");
hbufs = g_list_append (hbufs, hbuf);
}
}
GST_LOG ("creating next headers");
walk = mux->collect->data;
while (walk) {
GstOggPad *pad;
GstPad *thepad;
pad = (GstOggPad *) walk->data;
thepad = pad->collect.pad;
walk = walk->next;
GST_LOG ("looping over headers for pad %s:%s", GST_DEBUG_PAD_NAME (thepad));
hwalk = pad->headers;
while (hwalk) {
GstBuffer *buf = GST_BUFFER (hwalk->data);
ogg_packet packet;
ogg_page page;
hwalk = hwalk->next;
/* create a packet from the buffer */
packet.packet = GST_BUFFER_DATA (buf);
packet.bytes = GST_BUFFER_SIZE (buf);
packet.granulepos = GST_BUFFER_OFFSET_END (buf);
if (packet.granulepos == -1)
packet.granulepos = 0;
/* mark BOS and packet number */
packet.b_o_s = (pad->packetno == 0);
packet.packetno = pad->packetno++;
/* mark EOS */
packet.e_o_s = 0;
/* swap the packet in */
ogg_stream_packetin (&pad->stream, &packet);
gst_buffer_unref (buf);
/* if last header, flush page */
if (hwalk == NULL) {
GST_LOG ("flushing page as packet %d is first or last packet",
pad->packetno);
while (ogg_stream_flush (&pad->stream, &page)) {
GstBuffer *hbuf = gst_ogg_mux_buffer_from_page (mux, &page, FALSE);
GST_LOG ("swapped out page");
hbufs = g_list_append (hbufs, hbuf);
}
} else {
GST_LOG ("try to swap out page");
/* just try to swap out a page then */
while (ogg_stream_pageout (&pad->stream, &page) > 0) {
GstBuffer *hbuf = gst_ogg_mux_buffer_from_page (mux, &page, FALSE);
GST_LOG ("swapped out page");
hbufs = g_list_append (hbufs, hbuf);
}
}
}
g_list_free (pad->headers);
pad->headers = NULL;
}
/* hbufs holds all buffers for the headers now */
/* create caps with the buffers */
caps = gst_pad_get_caps (mux->srcpad);
if (caps) {
caps = gst_ogg_mux_set_header_on_caps (caps, hbufs);
gst_pad_set_caps (mux->srcpad, caps);
}
/* and send the buffers */
hwalk = hbufs;
while (hwalk) {
GstBuffer *buf = GST_BUFFER (hwalk->data);
hwalk = hwalk->next;
if ((ret = gst_ogg_mux_push_buffer (mux, buf)) != GST_FLOW_OK)
break;
}
g_list_free (hbufs);
return ret;
}
/* this function is called when there is data on all pads.
*
* basic idea:
*
* 1) find a pad to pull on, this is done by looking at the buffers
* to decide which one to use, we use the 'oldest' one first.
* 2) store the selected pad and keep on pulling until we fill a
* complete ogg page or the ogg page is filled above the max-delay
* threshold. This is needed because the ogg spec says that
* you should fill a complete page with data from the same logical
* stream. When the page is filled, go back to 1).
* 3) before filling a page, read ahead one more buffer to see if this
* packet is the last of the stream. We need to do this because the ogg
* spec mandates that the last packet should have the EOS flag set before
* sending it to ogg. FIXME: Apparently we're allowed to send empty 'nil'
* pages with the EOS flag set for EOS, so we could do this.
* 4) pages get queued on a per-pad queue. Every time a page is queued, a
* dequeue is called, which will dequeue the oldest page on any pad, provided
* that ALL pads have at least one marked page in the queue (TODO: or that
* pad is at EOS?)
*/
static GstFlowReturn
gst_ogg_mux_collected (GstCollectPads * pads, GstOggMux * ogg_mux)
{
GstOggPad *best;
gboolean delta_unit;
GstFlowReturn ret;
gint64 granulepos = 0;
GstClockTime timestamp;
GST_DEBUG ("collected");
/* queue buffers on all pads; find a buffer with the lowest timestamp */
best = gst_ogg_mux_queue_pads (ogg_mux);
if (best && !best->buffer)
return GST_FLOW_OK;
GST_DEBUG ("best pad %p", best);
if (!best) { /* EOS : FIXME !! We need to handle EOS correctly */
gst_pad_push_event (ogg_mux->srcpad, gst_event_new_eos ());
return GST_FLOW_WRONG_STATE;
}
/* if we were already pulling from one pad, but the new "best" buffer is
* from another pad, we need to check if we have reason to flush a page
* for the pad we were pulling from before */
if (ogg_mux->pulling && best &&
ogg_mux->pulling != best && ogg_mux->pulling->buffer) {
GstOggPad *pad = ogg_mux->pulling;
GstClockTime last_ts =
GST_BUFFER_TIMESTAMP (pad->buffer) + GST_BUFFER_DURATION (pad->buffer);
/* if the next packet in the current page is going to make the page
* too long, we need to flush */
if (last_ts > ogg_mux->next_ts + ogg_mux->max_delay) {
ogg_page page;
while (ogg_stream_flush (&pad->stream, &page)) {
/* Place page into the per-pad queue */
ret = gst_ogg_mux_pad_queue_page (ogg_mux, pad, &page,
pad->first_delta);
/* increment the page number counter */
pad->pageno++;
/* mark other pages as delta */
pad->first_delta = TRUE;
}
pad->new_page = TRUE;
ogg_mux->pulling = NULL;
}
}
/* if we don't know which pad to pull on, use the best one */
if (ogg_mux->pulling == NULL) {
ogg_mux->pulling = best;
/* remember timestamp of first buffer for this new pad */
if (ogg_mux->pulling != NULL) {
ogg_mux->next_ts = GST_BUFFER_TIMESTAMP (ogg_mux->pulling->buffer);
} else {
/* no pad to pull on, send EOS */
gst_pad_push_event (ogg_mux->srcpad, gst_event_new_eos ());
return GST_FLOW_WRONG_STATE;
}
}
if (ogg_mux->need_headers) {
ret = gst_ogg_mux_send_headers (ogg_mux);
ogg_mux->need_headers = FALSE;
}
/* we are pulling from a pad, continue to do so until a page
* has been filled and queued */
if (ogg_mux->pulling != NULL) {
ogg_packet packet;
ogg_page page;
GstBuffer *buf, *tmpbuf;
GstOggPad *pad = ogg_mux->pulling;
gint64 duration;
gboolean force_flush;
/* now see if we have a buffer */
buf = pad->buffer;
delta_unit = GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
duration = GST_BUFFER_DURATION (buf);
/* create a packet from the buffer */
packet.packet = GST_BUFFER_DATA (buf);
packet.bytes = GST_BUFFER_SIZE (buf);
packet.granulepos = GST_BUFFER_OFFSET_END (buf);
if (packet.granulepos == -1)
packet.granulepos = 0;
/* mark BOS and packet number */
packet.b_o_s = (pad->packetno == 0);
packet.packetno = pad->packetno++;
#if 0
/* read ahead one more buffer to find EOS */
tmpbuf = gst_ogg_mux_next_buffer (pad, &interrupt);
if (interrupt)
return;
/* data exhausted on this pad */
if (tmpbuf == NULL) {
/* stop pulling from the pad */
ogg_mux->pulling = NULL;
}
/* mark EOS */
packet.e_o_s = (tmpbuf == NULL ? 1 : 0);
#else
packet.e_o_s = 0;
tmpbuf = NULL;
#endif
/* we flush when we see a new keyframe */
force_flush = (pad->prev_delta && !delta_unit);
if (duration != -1) {
pad->duration += duration;
/* if page duration exceeds max, flush page */
if (pad->duration > ogg_mux->max_page_delay) {
force_flush = TRUE;
pad->duration = 0;
}
}
/* flush the currently built page if neccesary */
if (force_flush) {
while (ogg_stream_flush (&pad->stream, &page)) {
ret = gst_ogg_mux_pad_queue_page (ogg_mux, pad, &page,
pad->first_delta);
/* increment the page number counter */
pad->pageno++;
/* mark other pages as delta */
pad->first_delta = TRUE;
}
pad->new_page = TRUE;
}
/* if this is the first packet of a new page figure out the delta flag */
if (pad->new_page) {
if (delta_unit) {
/* This page is a delta frame */
if (ogg_mux->delta_pad == NULL) {
/* we got a delta unit on this pad */
ogg_mux->delta_pad = pad;
}
/* mark the page as delta */
pad->first_delta = TRUE;
} else {
/* got a keyframe */
if (ogg_mux->delta_pad == pad) {
/* if we get it on the pad with deltaunits,
* we mark the page as non delta */
pad->first_delta = FALSE;
} else if (ogg_mux->delta_pad != NULL) {
/* if there are pads with delta frames, we
* must mark this one as delta */
pad->first_delta = TRUE;
} else {
pad->first_delta = FALSE;
}
}
pad->new_page = FALSE;
}
/* save key unit to track delta->key unit transitions */
pad->prev_delta = delta_unit;
/* swap the packet in */
if (packet.e_o_s == 1)
GST_DEBUG_OBJECT (pad, "swapping in EOS packet");
if (packet.b_o_s == 1)
GST_DEBUG_OBJECT (pad, "swapping in BOS packet");
ogg_stream_packetin (&pad->stream, &packet);
granulepos = GST_BUFFER_OFFSET_END (pad->buffer);
timestamp = GST_BUFFER_TIMESTAMP (pad->buffer);
/* don't need the old buffer anymore */
gst_buffer_unref (pad->buffer);
/* store new readahead buffer */
pad->buffer = tmpbuf;
/* let ogg write out the pages now. The packet we got could end
* up in more than one page so we need to write them all */
if (ogg_stream_pageout (&pad->stream, &page) > 0) {
if (ogg_page_granulepos (&page) == granulepos) {
/* the packet we streamed in finishes on the page,
* because the page's granulepos is the granulepos of the last
* packet completed on that page,
* so update the timestamp that we will give to the page */
pad->timestamp = timestamp;
GST_DEBUG_OBJECT (pad, "Timestamp of pad is %" GST_TIME_FORMAT
", granulepos is %lld", GST_TIME_ARGS (timestamp), granulepos);
}
/* push the page */
ret = gst_ogg_mux_pad_queue_page (ogg_mux, pad, &page, pad->first_delta);
pad->pageno++;
/* mark next pages as delta */
pad->first_delta = TRUE;
/* use an inner loop here to flush the remaining pages and
* mark them as delta frames as well */
while (ogg_stream_pageout (&pad->stream, &page) > 0) {
if (ogg_page_granulepos (&page) == granulepos) {
/* the page has taken up the new packet completely, which means
* the packet ends the page and we can update the timestamp
* before pushing out */
pad->timestamp = timestamp;
}
/* we have a complete page now, we can push the page
* and make sure to pull on a new pad the next time around */
ret = gst_ogg_mux_pad_queue_page (ogg_mux, pad, &page,
pad->first_delta);
/* increment the page number counter */
pad->pageno++;
}
/* need a new page as well */
pad->new_page = TRUE;
pad->duration = 0;
/* we're done pulling on this pad, make sure to choose a new
* pad for pulling in the next iteration */
ogg_mux->pulling = NULL;
}
/* Update the timestamp, if neccesary, since and future page will have at
* least this timestamp.
*/
if (pad->timestamp < timestamp) {
pad->timestamp = timestamp;
GST_DEBUG_OBJECT (pad, "Updated timestamp of pad to %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
}
}
return GST_FLOW_OK;
}
static void
gst_ogg_mux_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstOggMux *ogg_mux;
ogg_mux = GST_OGG_MUX (object);
switch (prop_id) {
case ARG_MAX_DELAY:
g_value_set_uint64 (value, ogg_mux->max_delay);
break;
case ARG_MAX_PAGE_DELAY:
g_value_set_uint64 (value, ogg_mux->max_page_delay);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ogg_mux_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstOggMux *ogg_mux;
ogg_mux = GST_OGG_MUX (object);
switch (prop_id) {
case ARG_MAX_DELAY:
ogg_mux->max_delay = g_value_get_uint64 (value);
break;
case ARG_MAX_PAGE_DELAY:
ogg_mux->max_page_delay = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_ogg_mux_change_state (GstElement * element, GstStateChange transition)
{
GstOggMux *ogg_mux;
GstStateChangeReturn ret;
ogg_mux = GST_OGG_MUX (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
case GST_STATE_CHANGE_READY_TO_PAUSED:
ogg_mux->next_ts = 0;
ogg_mux->offset = 0;
ogg_mux->pulling = NULL;
gst_collectpads_start (ogg_mux->collect);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_collectpads_stop (ogg_mux->collect);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return ret;
}
gboolean
gst_ogg_mux_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_ogg_mux_debug, "oggmux", 0, "ogg muxer");
return gst_element_register (plugin, "oggmux", GST_RANK_NONE,
GST_TYPE_OGG_MUX);
}
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