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gstreamer/ext/theora/theoradec.c
Wim Taymans 62ef7da73b Small documentation updates/fixes 
Original commit message from CVS:
* ext/theora/theoradec.c:
* ext/vorbis/vorbisdec.c:
* gst-libs/gst/audio/gstringbuffer.c:
(gst_ring_buffer_commit_full):
* gst-libs/gst/audio/gstringbuffer.h:
* gst-libs/gst/rtp/gstrtpbuffer.c:
* gst-libs/gst/tag/gstvorbistag.c:
Small documentation updates/fixes
2007-01-09 11:15:57 +00:00

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/* GStreamer
* Copyright (C) 2004 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* 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.
*/
/**
* SECTION:element-theoradec
* @see_also: theoraenc, oggdemux
*
* <refsect2>
* <para>
* This element decodes theora streams into raw video
* <ulink url="http://www.theora.org/">Theora</ulink> is a royalty-free
* video codec maintained by the <ulink url="http://www.xiph.org/">Xiph.org
* Foundation</ulink>, based on the VP3 codec.
* </para>
* <para>
* </para>
* <title>Example pipeline</title>
* <programlisting>
* gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! xvimagesink
* </programlisting>
* This example pipeline will decode an ogg stream and decodes the theora video. Refer to
* the theoraenc example to create the ogg file.
* </refsect2>
*
* Last reviewed on 2006-03-01 (0.10.4)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gsttheoradec.h"
#include <gst/tag/tag.h>
#define GST_CAT_DEFAULT theoradec_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define THEORA_DEF_CROP TRUE
enum
{
ARG_0,
ARG_CROP
};
static const GstElementDetails theora_dec_details =
GST_ELEMENT_DETAILS ("Theora video decoder",
"Codec/Decoder/Video",
"decode raw theora streams to raw YUV video",
"Benjamin Otte <in7y118@public.uni-hamburg.de>, "
"Wim Taymans <wim@fluendo.com>");
static GstStaticPadTemplate theora_dec_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv, "
"format = (fourcc) I420, "
"framerate = (fraction) [0/1, MAX], "
"width = (int) [ 1, MAX ], " "height = (int) [ 1, MAX ]")
);
static GstStaticPadTemplate theora_dec_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-theora")
);
GST_BOILERPLATE (GstTheoraDec, gst_theora_dec, GstElement, GST_TYPE_ELEMENT);
static void theora_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void theora_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static gboolean theora_dec_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn theora_dec_chain (GstPad * pad, GstBuffer * buffer);
static GstStateChangeReturn theora_dec_change_state (GstElement * element,
GstStateChange transition);
static gboolean theora_dec_src_event (GstPad * pad, GstEvent * event);
static gboolean theora_dec_src_query (GstPad * pad, GstQuery * query);
static gboolean theora_dec_src_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value);
static gboolean theora_dec_sink_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value);
static gboolean theora_dec_sink_query (GstPad * pad, GstQuery * query);
#if 0
static const GstFormat *theora_get_formats (GstPad * pad);
#endif
#if 0
static const GstEventMask *theora_get_event_masks (GstPad * pad);
#endif
static const GstQueryType *theora_get_query_types (GstPad * pad);
static void
gst_theora_dec_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 (&theora_dec_src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&theora_dec_sink_factory));
gst_element_class_set_details (element_class, &theora_dec_details);
}
static void
gst_theora_dec_class_init (GstTheoraDecClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = theora_dec_set_property;
gobject_class->get_property = theora_dec_get_property;
g_object_class_install_property (gobject_class, ARG_CROP,
g_param_spec_boolean ("crop", "Crop",
"Crop the image to the visible region", THEORA_DEF_CROP,
(GParamFlags) G_PARAM_READWRITE));
gstelement_class->change_state = theora_dec_change_state;
GST_DEBUG_CATEGORY_INIT (theoradec_debug, "theoradec", 0, "Theora decoder");
}
static void
gst_theora_dec_init (GstTheoraDec * dec, GstTheoraDecClass * g_class)
{
dec->sinkpad =
gst_pad_new_from_static_template (&theora_dec_sink_factory, "sink");
gst_pad_set_query_function (dec->sinkpad, theora_dec_sink_query);
gst_pad_set_event_function (dec->sinkpad, theora_dec_sink_event);
gst_pad_set_chain_function (dec->sinkpad, theora_dec_chain);
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
dec->srcpad =
gst_pad_new_from_static_template (&theora_dec_src_factory, "src");
gst_pad_set_event_function (dec->srcpad, theora_dec_src_event);
gst_pad_set_query_type_function (dec->srcpad, theora_get_query_types);
gst_pad_set_query_function (dec->srcpad, theora_dec_src_query);
gst_pad_use_fixed_caps (dec->srcpad);
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
dec->crop = THEORA_DEF_CROP;
dec->gather = NULL;
dec->decode = NULL;
dec->queued = NULL;
}
static void
gst_theora_dec_reset (GstTheoraDec * dec)
{
dec->need_keyframe = TRUE;
dec->last_timestamp = -1;
dec->granulepos = -1;
dec->discont = TRUE;
dec->frame_nr = -1;
gst_segment_init (&dec->segment, GST_FORMAT_TIME);
GST_OBJECT_LOCK (dec);
dec->proportion = 1.0;
dec->earliest_time = -1;
GST_OBJECT_UNLOCK (dec);
g_list_foreach (dec->queued, (GFunc) gst_mini_object_unref, NULL);
g_list_free (dec->queued);
dec->queued = NULL;
g_list_foreach (dec->gather, (GFunc) gst_mini_object_unref, NULL);
g_list_free (dec->gather);
dec->gather = NULL;
g_list_foreach (dec->decode, (GFunc) gst_mini_object_unref, NULL);
g_list_free (dec->decode);
dec->decode = NULL;
}
static int
_theora_ilog (unsigned int v)
{
int ret = 0;
while (v) {
ret++;
v >>= 1;
}
return (ret);
}
static gint64
_theora_granule_frame (GstTheoraDec * dec, gint64 granulepos)
{
guint ilog;
gint framecount;
if (granulepos == -1)
return -1;
ilog = dec->granule_shift;
/* granulepos is last ilog bits for counting pframes since last iframe and
* bits in front of that for the framenumber of the last iframe. */
framecount = granulepos >> ilog;
framecount += granulepos - (framecount << ilog);
GST_DEBUG_OBJECT (dec, "framecount=%d, ilog=%u", framecount, ilog);
return framecount;
}
static GstClockTime
_theora_granule_time (GstTheoraDec * dec, gint64 granulepos)
{
gint framecount;
/* invalid granule results in invalid time */
if (granulepos == -1)
return -1;
/* get framecount */
framecount = _theora_granule_frame (dec, granulepos);
return gst_util_uint64_scale_int (framecount * GST_SECOND,
dec->info.fps_denominator, dec->info.fps_numerator);
}
static gint64
_inc_granulepos (GstTheoraDec * dec, gint64 granulepos)
{
gint framecount;
if (granulepos == -1)
return -1;
framecount = _theora_granule_frame (dec, granulepos);
return (framecount + 1) << dec->granule_shift;
}
#if 0
static const GstFormat *
theora_get_formats (GstPad * pad)
{
static GstFormat src_formats[] = {
GST_FORMAT_DEFAULT, /* frames in this case */
GST_FORMAT_TIME,
GST_FORMAT_BYTES,
0
};
static GstFormat sink_formats[] = {
GST_FORMAT_DEFAULT,
GST_FORMAT_TIME,
0
};
return (GST_PAD_IS_SRC (pad) ? src_formats : sink_formats);
}
#endif
#if 0
static const GstEventMask *
theora_get_event_masks (GstPad * pad)
{
static const GstEventMask theora_src_event_masks[] = {
{GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH},
{0,}
};
return theora_src_event_masks;
}
#endif
static const GstQueryType *
theora_get_query_types (GstPad * pad)
{
static const GstQueryType theora_src_query_types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
GST_QUERY_CONVERT,
0
};
return theora_src_query_types;
}
static gboolean
theora_dec_src_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstTheoraDec *dec;
guint64 scale = 1;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
/* we need the info part before we can done something */
if (!dec->have_header)
goto no_header;
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_value = gst_util_uint64_scale_int (src_value, 2,
dec->info.height * dec->info.width * 3);
break;
case GST_FORMAT_TIME:
/* seems like a rather silly conversion, implement me if you like */
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
scale = 3 * (dec->info.width * dec->info.height) / 2;
case GST_FORMAT_DEFAULT:
*dest_value = scale * gst_util_uint64_scale (src_value,
dec->info.fps_numerator, dec->info.fps_denominator * GST_SECOND);
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * dec->info.fps_denominator, dec->info.fps_numerator);
break;
case GST_FORMAT_BYTES:
*dest_value = gst_util_uint64_scale_int (src_value,
3 * dec->info.width * dec->info.height, 2);
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
done:
gst_object_unref (dec);
return res;
/* ERRORS */
no_header:
{
GST_DEBUG_OBJECT (dec, "no header yet, cannot convert");
res = FALSE;
goto done;
}
}
static gboolean
theora_dec_sink_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstTheoraDec *dec;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
/* we need the info part before we can done something */
if (!dec->have_header)
goto no_header;
switch (src_format) {
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = _theora_granule_time (dec, src_value);
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
{
guint rest;
/* framecount */
*dest_value = gst_util_uint64_scale (src_value,
dec->info.fps_numerator, GST_SECOND * dec->info.fps_denominator);
/* funny way of calculating granulepos in theora */
rest = *dest_value / dec->info.keyframe_frequency_force;
*dest_value -= rest;
*dest_value <<= dec->granule_shift;
*dest_value += rest;
break;
}
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
}
done:
gst_object_unref (dec);
return res;
/* ERRORS */
no_header:
{
GST_DEBUG_OBJECT (dec, "no header yet, cannot convert");
res = FALSE;
goto done;
}
}
static gboolean
theora_dec_src_query (GstPad * pad, GstQuery * query)
{
GstTheoraDec *dec;
gboolean res = FALSE;
dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 granulepos, value;
GstFormat my_format, format;
gint64 time;
/* we can convert a granule position to everything */
granulepos = dec->granulepos;
GST_LOG_OBJECT (dec,
"query %p: we have current granule: %lld", query, granulepos);
/* parse format */
gst_query_parse_position (query, &format, NULL);
/* and convert to the final format in two steps with time as the
* intermediate step */
my_format = GST_FORMAT_TIME;
if (!(res =
theora_dec_sink_convert (dec->sinkpad, GST_FORMAT_DEFAULT,
granulepos, &my_format, &time)))
goto error;
time = gst_segment_to_stream_time (&dec->segment, GST_FORMAT_TIME, time);
GST_LOG_OBJECT (dec,
"query %p: our time: %" GST_TIME_FORMAT, query, GST_TIME_ARGS (time));
if (!(res =
theora_dec_src_convert (pad, my_format, time, &format, &value)))
goto error;
gst_query_set_position (query, format, value);
GST_LOG_OBJECT (dec,
"query %p: we return %lld (format %u)", query, value, format);
break;
}
case GST_QUERY_DURATION:
{
GstPad *peer;
if (!(peer = gst_pad_get_peer (dec->sinkpad)))
goto error;
/* forward to peer for total */
res = gst_pad_query (peer, query);
gst_object_unref (peer);
if (!res)
goto error;
break;
}
case GST_QUERY_CONVERT:
{
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
if (!(res =
theora_dec_src_convert (pad, src_fmt, src_val, &dest_fmt,
&dest_val)))
goto error;
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
done:
gst_object_unref (dec);
return res;
/* ERRORS */
error:
{
GST_DEBUG_OBJECT (dec, "query failed");
goto done;
}
}
static gboolean
theora_dec_sink_query (GstPad * pad, GstQuery * query)
{
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONVERT:
{
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
if (!(res =
theora_dec_sink_convert (pad, src_fmt, src_val, &dest_fmt,
&dest_val)))
goto error;
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
error:
return res;
}
static gboolean
theora_dec_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstTheoraDec *dec;
dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
GstFormat format, tformat;
gdouble rate;
GstEvent *real_seek;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 tcur, tstop;
gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur,
&stop_type, &stop);
gst_event_unref (event);
/* we have to ask our peer to seek to time here as we know
* nothing about how to generate a granulepos from the src
* formats or anything.
*
* First bring the requested format to time
*/
tformat = GST_FORMAT_TIME;
if (!(res = theora_dec_src_convert (pad, format, cur, &tformat, &tcur)))
goto convert_error;
if (!(res = theora_dec_src_convert (pad, format, stop, &tformat, &tstop)))
goto convert_error;
/* then seek with time on the peer */
real_seek = gst_event_new_seek (rate, GST_FORMAT_TIME,
flags, cur_type, tcur, stop_type, tstop);
res = gst_pad_push_event (dec->sinkpad, real_seek);
break;
}
case GST_EVENT_QOS:
{
gdouble proportion;
GstClockTimeDiff diff;
GstClockTime timestamp;
gst_event_parse_qos (event, &proportion, &diff, &timestamp);
/* we cannot randomly skip frame decoding since we don't have
* B frames. we can however use the timestamp and diff to not
* push late frames. This would at least save us the time to
* crop/memcpy the data. */
GST_OBJECT_LOCK (dec);
dec->proportion = proportion;
dec->earliest_time = timestamp + diff;
GST_OBJECT_UNLOCK (dec);
GST_DEBUG_OBJECT (dec, "got QoS %" GST_TIME_FORMAT ", %" G_GINT64_FORMAT,
GST_TIME_ARGS (timestamp), diff);
res = gst_pad_push_event (dec->sinkpad, event);
break;
}
default:
res = gst_pad_push_event (dec->sinkpad, event);
break;
}
done:
gst_object_unref (dec);
return res;
/* ERRORS */
convert_error:
{
GST_DEBUG_OBJECT (dec, "could not convert format");
goto done;
}
}
static gboolean
theora_dec_sink_event (GstPad * pad, GstEvent * event)
{
gboolean ret = FALSE;
GstTheoraDec *dec;
dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
GST_LOG_OBJECT (dec, "handling event");
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (dec->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_theora_dec_reset (dec);
ret = gst_pad_push_event (dec->srcpad, event);
break;
case GST_EVENT_EOS:
ret = gst_pad_push_event (dec->srcpad, event);
break;
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
/* we need TIME and a positive rate */
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
/* now configure the values */
gst_segment_set_newsegment_full (&dec->segment, update,
rate, arate, format, start, stop, time);
/* and forward */
ret = gst_pad_push_event (dec->srcpad, event);
break;
}
default:
ret = gst_pad_push_event (dec->srcpad, event);
break;
}
done:
gst_object_unref (dec);
return ret;
/* ERRORS */
newseg_wrong_format:
{
GST_DEBUG_OBJECT (dec, "received non TIME newsegment");
gst_event_unref (event);
goto done;
}
}
static GstFlowReturn
theora_handle_comment_packet (GstTheoraDec * dec, ogg_packet * packet)
{
gchar *encoder = NULL;
GstBuffer *buf;
GstTagList *list;
GST_DEBUG_OBJECT (dec, "parsing comment packet");
buf = gst_buffer_new_and_alloc (packet->bytes);
memcpy (GST_BUFFER_DATA (buf), packet->packet, packet->bytes);
list =
gst_tag_list_from_vorbiscomment_buffer (buf, (guint8 *) "\201theora", 7,
&encoder);
gst_buffer_unref (buf);
if (!list) {
GST_ERROR_OBJECT (dec, "couldn't decode comments");
list = gst_tag_list_new ();
}
if (encoder) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_ENCODER, encoder, NULL);
g_free (encoder);
}
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_ENCODER_VERSION, dec->info.version_major,
GST_TAG_VIDEO_CODEC, "Theora", NULL);
if (dec->info.target_bitrate > 0) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_BITRATE, dec->info.target_bitrate,
GST_TAG_NOMINAL_BITRATE, dec->info.target_bitrate, NULL);
}
gst_element_found_tags_for_pad (GST_ELEMENT_CAST (dec), dec->srcpad, list);
return GST_FLOW_OK;
}
static GstFlowReturn
theora_handle_type_packet (GstTheoraDec * dec, ogg_packet * packet)
{
GstCaps *caps;
gint par_num, par_den;
GST_DEBUG_OBJECT (dec, "fps %d/%d, PAR %d/%d",
dec->info.fps_numerator, dec->info.fps_denominator,
dec->info.aspect_numerator, dec->info.aspect_denominator);
/* calculate par
* the info.aspect_* values reflect PAR;
* 0:0 is allowed and can be interpreted as 1:1, so correct for it */
par_num = dec->info.aspect_numerator;
par_den = dec->info.aspect_denominator;
if (par_num == 0 && par_den == 0) {
par_num = par_den = 1;
}
/* theora has:
*
* width/height : dimension of the encoded frame
* frame_width/frame_height : dimension of the visible part
* offset_x/offset_y : offset in encoded frame where visible part starts
*/
GST_DEBUG_OBJECT (dec, "dimension %dx%d, PAR %d/%d", dec->info.width,
dec->info.height, par_num, par_den);
GST_DEBUG_OBJECT (dec, "frame dimension %dx%d, offset %d:%d",
dec->info.frame_width, dec->info.frame_height,
dec->info.offset_x, dec->info.offset_y);
if (dec->crop) {
/* add black borders to make width/height/offsets even. we need this because
* we cannot express an offset to the peer plugin. */
dec->width =
GST_ROUND_UP_2 (dec->info.frame_width + (dec->info.offset_x & 1));
dec->height =
GST_ROUND_UP_2 (dec->info.frame_height + (dec->info.offset_y & 1));
dec->offset_x = dec->info.offset_x & ~1;
dec->offset_y = dec->info.offset_y & ~1;
} else {
/* no cropping, use the encoded dimensions */
dec->width = dec->info.width;
dec->height = dec->info.height;
dec->offset_x = 0;
dec->offset_y = 0;
}
dec->granule_shift = _theora_ilog (dec->info.keyframe_frequency_force - 1);
GST_DEBUG_OBJECT (dec, "after fixup frame dimension %dx%d, offset %d:%d",
dec->width, dec->height, dec->offset_x, dec->offset_y);
/* done */
theora_decode_init (&dec->state, &dec->info);
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),
"framerate", GST_TYPE_FRACTION,
dec->info.fps_numerator, dec->info.fps_denominator,
"pixel-aspect-ratio", GST_TYPE_FRACTION, par_num, par_den,
"width", G_TYPE_INT, dec->width, "height", G_TYPE_INT, dec->height, NULL);
gst_pad_set_caps (dec->srcpad, caps);
gst_caps_unref (caps);
dec->have_header = TRUE;
return GST_FLOW_OK;
}
static GstFlowReturn
theora_handle_header_packet (GstTheoraDec * dec, ogg_packet * packet)
{
GstFlowReturn res;
GST_DEBUG_OBJECT (dec, "parsing header packet");
if (theora_decode_header (&dec->info, &dec->comment, packet))
goto header_read_error;
switch (packet->packet[0]) {
case 0x81:
res = theora_handle_comment_packet (dec, packet);
break;
case 0x82:
res = theora_handle_type_packet (dec, packet);
break;
default:
/* ignore */
g_warning ("unknown theora header packet found");
case 0x80:
/* nothing special, this is the identification header */
res = GST_FLOW_OK;
break;
}
return res;
/* ERRORS */
header_read_error:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't read header packet"));
return GST_FLOW_ERROR;
}
}
/* returns TRUE if buffer is within segment, else FALSE.
* if Buffer is on segment border, it's timestamp and duration will be clipped */
static gboolean
clip_buffer (GstTheoraDec * dec, GstBuffer * buf)
{
gboolean res = TRUE;
GstClockTime in_ts, in_dur, stop;
gint64 cstart, cstop;
in_ts = GST_BUFFER_TIMESTAMP (buf);
in_dur = GST_BUFFER_DURATION (buf);
GST_LOG_OBJECT (dec,
"timestamp:%" GST_TIME_FORMAT " , duration:%" GST_TIME_FORMAT,
GST_TIME_ARGS (in_ts), GST_TIME_ARGS (in_dur));
/* can't clip without TIME segment */
if (dec->segment.format != GST_FORMAT_TIME)
goto beach;
/* we need a start time */
if (!GST_CLOCK_TIME_IS_VALID (in_ts))
goto beach;
/* generate valid stop, if duration unknown, we have unknown stop */
stop =
GST_CLOCK_TIME_IS_VALID (in_dur) ? (in_ts + in_dur) : GST_CLOCK_TIME_NONE;
/* now clip */
if (!(res = gst_segment_clip (&dec->segment, GST_FORMAT_TIME,
in_ts, stop, &cstart, &cstop)))
goto beach;
/* update timestamp and possibly duration if the clipped stop time is
* valid */
GST_BUFFER_TIMESTAMP (buf) = cstart;
if (GST_CLOCK_TIME_IS_VALID (cstop))
GST_BUFFER_DURATION (buf) = cstop - cstart;
beach:
GST_LOG_OBJECT (dec, "%sdropping", (res ? "not " : ""));
return res;
}
/* FIXME, this needs to be moved to the demuxer */
static GstFlowReturn
theora_dec_push_forward (GstTheoraDec * dec, GstBuffer * buf)
{
GstFlowReturn result = GST_FLOW_OK;
GstClockTime outtime = GST_BUFFER_TIMESTAMP (buf);
if (outtime == GST_CLOCK_TIME_NONE) {
dec->queued = g_list_append (dec->queued, buf);
GST_DEBUG_OBJECT (dec, "queued buffer");
} else {
if (dec->queued) {
gint64 size;
GList *walk;
GST_DEBUG_OBJECT (dec, "first buffer with time %" GST_TIME_FORMAT,
GST_TIME_ARGS (outtime));
size = g_list_length (dec->queued);
for (walk = dec->queued; walk; walk = g_list_next (walk)) {
GstBuffer *buffer = GST_BUFFER (walk->data);
GstClockTime time;
time = outtime - gst_util_uint64_scale_int (size * GST_SECOND,
dec->info.fps_denominator, dec->info.fps_numerator);
GST_DEBUG_OBJECT (dec, "patch buffer %lld %lld", size, time);
GST_BUFFER_TIMESTAMP (buffer) = time;
if (dec->discont) {
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
dec->discont = FALSE;
}
/* ignore the result.. */
if (clip_buffer (dec, buffer))
gst_pad_push (dec->srcpad, buffer);
else
gst_buffer_unref (buffer);
size--;
}
g_list_free (dec->queued);
dec->queued = NULL;
}
if (dec->discont) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
dec->discont = FALSE;
}
if (clip_buffer (dec, buf))
result = gst_pad_push (dec->srcpad, buf);
else
gst_buffer_unref (buf);
}
return result;
}
static GstFlowReturn
theora_dec_push_reverse (GstTheoraDec * dec, GstBuffer * buf)
{
GstFlowReturn result = GST_FLOW_OK;
dec->queued = g_list_prepend (dec->queued, buf);
return result;
}
static GstFlowReturn
theora_handle_data_packet (GstTheoraDec * dec, ogg_packet * packet,
GstClockTime outtime)
{
/* normal data packet */
yuv_buffer yuv;
GstBuffer *out;
guint i;
gboolean keyframe;
gint out_size;
gint stride_y, stride_uv;
gint width, height;
gint cwidth, cheight;
GstFlowReturn result;
if (G_UNLIKELY (!dec->have_header))
goto not_initialized;
/* the second most significant bit of the first data byte is cleared
* for keyframes */
keyframe = (packet->packet[0] & 0x40) == 0;
if (G_UNLIKELY (keyframe)) {
GST_DEBUG_OBJECT (dec, "we have a keyframe");
dec->need_keyframe = FALSE;
} else if (G_UNLIKELY (dec->need_keyframe)) {
goto dropping;
}
GST_DEBUG_OBJECT (dec, "parsing data packet");
/* this does the decoding */
if (G_UNLIKELY (theora_decode_packetin (&dec->state, packet)))
goto decode_error;
if (outtime != -1) {
gboolean need_skip;
GstClockTime qostime;
/* qos needs to be done on running time */
qostime = gst_segment_to_running_time (&dec->segment, GST_FORMAT_TIME,
outtime);
GST_OBJECT_LOCK (dec);
/* check for QoS, don't perform the last steps of getting and
* pushing the buffers that are known to be late. */
/* FIXME, we can also entirely skip decoding if the next valid buffer is
* known to be after a keyframe (using the granule_shift) */
need_skip = dec->earliest_time != -1 && qostime <= dec->earliest_time;
GST_OBJECT_UNLOCK (dec);
if (need_skip)
goto dropping_qos;
}
/* this does postprocessing and set up the decoded frame
* pointers in our yuv variable */
if (G_UNLIKELY (theora_decode_YUVout (&dec->state, &yuv) < 0))
goto no_yuv;
if (G_UNLIKELY ((yuv.y_width != dec->info.width)
|| (yuv.y_height != dec->info.height)))
goto wrong_dimensions;
width = dec->width;
height = dec->height;
cwidth = width / 2;
cheight = height / 2;
/* should get the stride from the caps, for now we round up to the nearest
* multiple of 4 because some element needs it. chroma needs special
* treatment, see videotestsrc. */
stride_y = GST_ROUND_UP_4 (width);
stride_uv = GST_ROUND_UP_8 (width) / 2;
out_size = stride_y * height + stride_uv * cheight * 2;
/* now copy over the area contained in offset_x,offset_y,
* frame_width, frame_height */
result =
gst_pad_alloc_buffer_and_set_caps (dec->srcpad, GST_BUFFER_OFFSET_NONE,
out_size, GST_PAD_CAPS (dec->srcpad), &out);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto no_buffer;
/* copy the visible region to the destination. This is actually pretty
* complicated and gstreamer doesn't support all the needed caps to do this
* correctly. For example, when we have an odd offset, we should only combine
* 1 row/column of luma samples with one chroma sample in colorspace conversion.
* We compensate for this by adding a black border around the image when the
* offset or size is odd (see above).
*/
{
guchar *dest_y, *src_y;
guchar *dest_u, *src_u;
guchar *dest_v, *src_v;
gint offset;
dest_y = GST_BUFFER_DATA (out);
dest_u = dest_y + stride_y * height;
dest_v = dest_u + stride_uv * cheight;
src_y = yuv.y + dec->offset_x + dec->offset_y * yuv.y_stride;
for (i = 0; i < height; i++) {
memcpy (dest_y, src_y, width);
dest_y += stride_y;
src_y += yuv.y_stride;
}
offset = dec->offset_x / 2 + dec->offset_y / 2 * yuv.uv_stride;
src_u = yuv.u + offset;
src_v = yuv.v + offset;
for (i = 0; i < cheight; i++) {
memcpy (dest_u, src_u, cwidth);
memcpy (dest_v, src_v, cwidth);
dest_u += stride_uv;
src_u += yuv.uv_stride;
dest_v += stride_uv;
src_v += yuv.uv_stride;
}
}
GST_BUFFER_OFFSET (out) = dec->frame_nr;
if (dec->frame_nr != -1)
dec->frame_nr++;
GST_BUFFER_OFFSET_END (out) = dec->frame_nr;
GST_BUFFER_DURATION (out) =
gst_util_uint64_scale_int (GST_SECOND, dec->info.fps_denominator,
dec->info.fps_numerator);
GST_BUFFER_TIMESTAMP (out) = outtime;
if (dec->segment.rate >= 0.0)
result = theora_dec_push_forward (dec, out);
else
result = theora_dec_push_reverse (dec, out);
return result;
/* ERRORS */
not_initialized:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("no header sent yet"));
return GST_FLOW_ERROR;
}
dropping:
{
GST_WARNING_OBJECT (dec, "dropping frame because we need a keyframe");
dec->discont = TRUE;
return GST_FLOW_OK;
}
dropping_qos:
{
if (dec->frame_nr != -1)
dec->frame_nr++;
dec->discont = TRUE;
GST_WARNING_OBJECT (dec, "dropping frame because of QoS");
return GST_FLOW_OK;
}
decode_error:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("theora decoder did not decode data packet"));
return GST_FLOW_ERROR;
}
no_yuv:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't read out YUV image"));
return GST_FLOW_ERROR;
}
wrong_dimensions:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, FORMAT,
(NULL), ("dimensions of image do not match header"));
return GST_FLOW_ERROR;
}
no_buffer:
{
GST_DEBUG_OBJECT (dec, "could not get buffer, reason: %s",
gst_flow_get_name (result));
return result;
}
}
static GstFlowReturn
theora_dec_decode_buffer (GstTheoraDec * dec, GstBuffer * buf)
{
ogg_packet packet;
GstFlowReturn result = GST_FLOW_OK;
/* make ogg_packet out of the buffer */
packet.packet = GST_BUFFER_DATA (buf);
packet.bytes = GST_BUFFER_SIZE (buf);
packet.granulepos = GST_BUFFER_OFFSET_END (buf);
packet.packetno = 0; /* we don't really care */
packet.b_o_s = dec->have_header ? 0 : 1;
/* EOS does not matter for the decoder */
packet.e_o_s = 0;
if (dec->have_header) {
if (packet.granulepos != -1) {
dec->granulepos = packet.granulepos;
dec->last_timestamp = _theora_granule_time (dec, packet.granulepos);
} else if (dec->last_timestamp != -1) {
dec->last_timestamp = _theora_granule_time (dec, dec->granulepos);
}
if (dec->last_timestamp == -1 && GST_BUFFER_TIMESTAMP_IS_VALID (buf))
dec->last_timestamp = GST_BUFFER_TIMESTAMP (buf);
} else {
dec->last_timestamp = -1;
}
GST_DEBUG_OBJECT (dec, "header=%02x packetno=%lld, outtime=%" GST_TIME_FORMAT,
packet.bytes ? packet.packet[0] : -1, packet.packetno,
GST_TIME_ARGS (dec->last_timestamp));
/* switch depending on packet type. A zero byte packet is always a data
* packet; we don't dereference it in that case. */
if (packet.bytes && packet.packet[0] & 0x80) {
if (dec->have_header) {
GST_WARNING_OBJECT (GST_OBJECT (dec), "Ignoring header");
goto done;
}
result = theora_handle_header_packet (dec, &packet);
} else {
result = theora_handle_data_packet (dec, &packet, dec->last_timestamp);
}
done:
/* interpolate granule pos */
dec->granulepos = _inc_granulepos (dec, dec->granulepos);
return result;
}
/* For reverse playback we use a technique that can be used for
* any keyframe based video codec.
*
* Input:
* Buffer decoding order: 7 8 9 4 5 6 1 2 3 EOS
* Keyframe flag: K K
* Discont flag: D D D
*
* - Each Discont marks a discont in the decoding order.
* - The keyframes mark where we can start decoding.
*
* First we prepend incomming buffers to the gather queue, whenever we receive
* a discont, we flush out the gather queue.
*
* The above data will be accumulated in the gather queue like this:
*
* gather queue: 9 8 7
* D
*
* Whe buffer 4 is received (with a DISCONT), we flush the gather queue like
* this:
*
* while (gather)
* take head of queue and prepend to decode queue.
* if we copied a keyframe, decode the decode queue.
*
* After we flushed the gather queue, we add 4 to the (now empty) gather queue.
* We get the following situation:
*
* gather queue: 4
* decode queue: 7 8 9
*
* After we received 5 (Keyframe) and 6:
*
* gather queue: 6 5 4
* decode queue: 7 8 9
*
* When we receive 1 (DISCONT) which triggers a flush of the gather queue:
*
* Copy head of the gather queue (6) to decode queue:
*
* gather queue: 5 4
* decode queue: 6 7 8 9
*
* Copy head of the gather queue (5) to decode queue. This is a keyframe so we
* can start decoding.
*
* gather queue: 4
* decode queue: 5 6 7 8 9
*
* Decode frames in decode queue, store raw decoded data in output queue, we
* can take the head of the decode queue and prepend the decoded result in the
* output queue:
*
* gather queue: 4
* decode queue:
* output queue: 9 8 7 6 5
*
* Now output all the frames in the output queue, picking a frame from the
* head of the queue.
*
* Copy head of the gather queue (4) to decode queue, we flushed the gather
* queue and can now store input buffer in the gather queue:
*
* gather queue: 1
* decode queue: 4
*
* When we receive EOS, the queue looks like:
*
* gather queue: 3 2 1
* decode queue: 4
*
* Fill decode queue, first keyframe we copy is 2:
*
* gather queue: 1
* decode queue: 2 3 4
*
* Decoded output:
*
* gather queue: 1
* decode queue:
* output queue: 4 3 2
*
* Leftover buffer 1 cannot be decoded and must be discarded.
*/
static GstFlowReturn
theora_dec_flush_decode (GstTheoraDec * dec)
{
GstFlowReturn res = GST_FLOW_OK;
while (dec->decode) {
GstBuffer *buf = GST_BUFFER_CAST (dec->decode->data);
GST_DEBUG_OBJECT (dec, "decoding buffer %p, ts %" GST_TIME_FORMAT,
buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
/* decode buffer, prepend to output queue */
res = theora_dec_decode_buffer (dec, buf);
/* don't need it anymore now */
gst_buffer_unref (buf);
dec->decode = g_list_delete_link (dec->decode, dec->decode);
}
while (dec->queued) {
GstBuffer *buf = GST_BUFFER_CAST (dec->queued->data);
/* iterate ouput queue an push downstream */
res = gst_pad_push (dec->srcpad, buf);
dec->queued = g_list_delete_link (dec->queued, dec->queued);
}
return res;
}
static GstFlowReturn
theora_dec_chain_reverse (GstTheoraDec * dec, gboolean discont, GstBuffer * buf)
{
GstFlowReturn res = GST_FLOW_OK;
/* if we have a discont, move buffers to the decode list */
if (G_UNLIKELY (discont)) {
GST_DEBUG_OBJECT (dec, "received discont,gathering buffers");
while (dec->gather) {
GstBuffer *gbuf;
guint8 *data;
gbuf = GST_BUFFER_CAST (dec->gather->data);
/* remove from the gather list */
dec->gather = g_list_delete_link (dec->gather, dec->gather);
/* copy to decode queue */
dec->decode = g_list_prepend (dec->decode, gbuf);
/* if we copied a keyframe, flush and decode the decode queue */
data = GST_BUFFER_DATA (gbuf);
if ((data[0] & 0x40) == 0) {
GST_DEBUG_OBJECT (dec, "copied keyframe");
res = theora_dec_flush_decode (dec);
}
}
}
/* add buffer to gather queue */
GST_DEBUG_OBJECT (dec, "gathering buffer %p, size %u", buf,
GST_BUFFER_SIZE (buf));
dec->gather = g_list_prepend (dec->gather, buf);
return res;
}
static GstFlowReturn
theora_dec_chain_forward (GstTheoraDec * dec, gboolean discont,
GstBuffer * buffer)
{
GstFlowReturn result;
result = theora_dec_decode_buffer (dec, buffer);
gst_buffer_unref (buffer);
return result;
}
static GstFlowReturn
theora_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstTheoraDec *dec;
GstFlowReturn res;
gboolean discont;
dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
/* peel of DISCONT flag */
discont = GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT);
/* resync on DISCONT */
if (G_UNLIKELY (discont)) {
GST_DEBUG_OBJECT (dec, "received DISCONT buffer");
dec->need_keyframe = TRUE;
dec->last_timestamp = -1;
dec->granulepos = -1;
dec->discont = TRUE;
}
if (dec->segment.rate > 0.0)
res = theora_dec_chain_forward (dec, discont, buf);
else
res = theora_dec_chain_reverse (dec, discont, buf);
gst_object_unref (dec);
return res;
}
static GstStateChangeReturn
theora_dec_change_state (GstElement * element, GstStateChange transition)
{
GstTheoraDec *dec = GST_THEORA_DEC (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
theora_info_init (&dec->info);
theora_comment_init (&dec->comment);
dec->have_header = FALSE;
gst_theora_dec_reset (dec);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
theora_clear (&dec->state);
theora_comment_clear (&dec->comment);
theora_info_clear (&dec->info);
gst_theora_dec_reset (dec);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static void
theora_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTheoraDec *dec = GST_THEORA_DEC (object);
switch (prop_id) {
case ARG_CROP:
dec->crop = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
theora_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTheoraDec *dec = GST_THEORA_DEC (object);
switch (prop_id) {
case ARG_CROP:
g_value_set_boolean (value, dec->crop);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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