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gstreamer/ext/theora/theoradec.c
Andy Wingo 55d437af1c gst/: Ghost pad API fixes. 
Original commit message from CVS:
2005-06-09  Andy Wingo  <wingo@pobox.com>

* gst-libs/gst/gconf/gconf.c:
* gst/playback/test.c:
* gst/playback/gstplaybin.c (gen_video_element): Ghost pad API
fixes.

* gst/audioconvert/gstaudioconvert.c: RPAD fixes.

* ext/theora/theoraenc.c (theora_enc_chain):
* ext/theora/theoradec.c (theora_handle_data_packet): GCC4 fixes.

* ext/ogg/gstoggdemux.c (GstOggPad): Derive from GstPad, not
RealPad.
2005-06-08 22:18:05 +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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
#include <theora/theora.h>
#include <string.h>
#include <gst/tag/tag.h>
GST_DEBUG_CATEGORY (theoradec_debug);
#define GST_CAT_DEFAULT theoradec_debug
#define GST_TYPE_THEORA_DEC \
(gst_theora_dec_get_type())
#define GST_THEORA_DEC(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_THEORA_DEC,GstTheoraDec))
#define GST_THEORA_DEC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_THEORA_DEC,GstTheoraDec))
#define GST_IS_THEORA_DEC(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_THEORA_DEC))
#define GST_IS_THEORA_DEC_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_THEORA_DEC))
typedef struct _GstTheoraDec GstTheoraDec;
typedef struct _GstTheoraDecClass GstTheoraDecClass;
struct _GstTheoraDec
{
GstElement element;
GstPad *sinkpad;
GstPad *srcpad;
theora_state state;
theora_info info;
theora_comment comment;
guint packetno;
guint64 granulepos;
gboolean initialized;
gboolean need_keyframe;
gint width, height;
gint offset_x, offset_y;
gboolean crop;
GList *queued;
};
struct _GstTheoraDecClass
{
GstElementClass parent_class;
};
#define THEORA_DEF_CROP TRUE
enum
{
ARG_0,
ARG_CROP
};
static GstElementDetails theora_dec_details = {
"TheoraDec",
"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 = (double) [0, 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 GstElementStateReturn theora_dec_change_state (GstElement * element);
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)
{
dec->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&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_template (gst_static_pad_template_get
(&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_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
dec->crop = THEORA_DEF_CROP;
dec->queued = NULL;
}
/* FIXME: copy from libtheora, theora should somehow make this available for seeking */
static int
_theora_ilog (unsigned int v)
{
int ret = 0;
while (v) {
ret++;
v >>= 1;
}
return (ret);
}
static void
_inc_granulepos (GstTheoraDec * dec)
{
guint ilog;
gint framecount;
if (dec->granulepos == -1)
return;
ilog = _theora_ilog (dec->info.keyframe_frequency_force - 1);
framecount = dec->granulepos >> ilog;
framecount += dec->granulepos - (framecount << ilog);
GST_DEBUG_OBJECT (dec, "framecount=%d, ilog=%u", framecount, ilog);
framecount++;
dec->granulepos = (framecount << ilog);
}
#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_TOTAL,
GST_QUERY_POSITION,
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;
dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
/* we need the info part before we can done something */
if (dec->packetno < 1)
return FALSE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_value =
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 * (((guint64) 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 = src_value * (GST_SECOND * dec->info.fps_denominator /
dec->info.fps_numerator);
break;
case GST_FORMAT_BYTES:
*dest_value =
src_value * 3 * (dec->info.width * dec->info.height) / 2;
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
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;
dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
/* we need the info part before we can done something */
if (dec->packetno < 1)
return FALSE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
switch (src_format) {
case GST_FORMAT_DEFAULT:
{
guint64 framecount;
guint ilog;
ilog = _theora_ilog (dec->info.keyframe_frequency_force - 1);
/* 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 = src_value >> ilog;
framecount += src_value - (framecount << ilog);
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = framecount * (GST_SECOND * dec->info.fps_denominator /
dec->info.fps_numerator);
break;
default:
res = FALSE;
}
break;
}
case GST_FORMAT_TIME:
{
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
{
guint ilog = _theora_ilog (dec->info.keyframe_frequency_force - 1);
guint rest;
/* framecount */
*dest_value = 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 <<= ilog;
*dest_value += rest;
break;
}
default:
res = FALSE;
break;
}
break;
}
default:
res = FALSE;
}
return res;
}
static gboolean
theora_dec_src_query (GstPad * pad, GstQuery * query)
{
GstTheoraDec *dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 granulepos, total, value;
GstFormat my_format, format;
gint64 time;
/* forward to peer for total */
if (!(res = gst_pad_query (GST_PAD_PEER (dec->sinkpad), query)))
goto error;
/* 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 total time from peer and format */
gst_query_parse_position (query, &format, NULL, &total);
GST_LOG_OBJECT (dec,
"query %p: peer returned total: %lld (format %u)",
query, total, format);
/* 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;
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, total);
GST_LOG_OBJECT (dec,
"query %p: we return %lld and %lld (format %u)",
query, value, total, format);
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 = FALSE;
break;
}
return res;
error:
GST_DEBUG ("query failed");
return res;
}
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 = FALSE;
break;
}
error:
return res;
}
static gboolean
theora_dec_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstTheoraDec *dec;
GstFormat format;
dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:{
gint64 value;
GstEvent *real_seek;
/* 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
*/
format = GST_FORMAT_TIME;
if (!(res = theora_dec_src_convert (pad, GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event), &format, &value)))
goto error;
/* then seek with time on the peer */
real_seek = gst_event_new_seek (
(GST_EVENT_SEEK_TYPE (event) & ~GST_SEEK_FORMAT_MASK) |
format, value);
res = gst_pad_send_event (GST_PAD_PEER (dec->sinkpad), real_seek);
gst_event_unref (event);
break;
}
default:
res = gst_pad_event_default (pad, event);
break;
}
return res;
error:
gst_event_unref (event);
return res;
}
static gboolean
theora_dec_sink_event (GstPad * pad, GstEvent * event)
{
gint64 start_value, end_value, time, bytes;
gboolean ret = TRUE;
GstTheoraDec *dec;
dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
GST_LOG_OBJECT (dec, "handling event");
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
GST_STREAM_LOCK (pad);
if (gst_event_discont_get_value (event, GST_FORMAT_DEFAULT,
&start_value, &end_value)) {
dec->granulepos = start_value;
GST_DEBUG_OBJECT (dec,
"setting granuleposition to %" G_GUINT64_FORMAT " after discont",
start_value);
} else {
GST_WARNING_OBJECT (dec,
"discont event didn't include offset, we might set it wrong now");
dec->granulepos = -1;
}
if (dec->packetno < 3) {
if (dec->granulepos != 0)
GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
("can't handle discont before parsing first 3 packets"));
dec->packetno = 0;
gst_pad_push_event (dec->srcpad, gst_event_new_discontinuous (FALSE,
GST_FORMAT_TIME, (guint64) 0, GST_FORMAT_DEFAULT,
(guint64) 0, GST_FORMAT_BYTES, (guint64) 0, 0));
} else {
GstFormat time_format, default_format, bytes_format;
time_format = GST_FORMAT_TIME;
default_format = GST_FORMAT_DEFAULT;
bytes_format = GST_FORMAT_BYTES;
/* if one of them works, all of them work */
if (theora_dec_sink_convert (dec->sinkpad, GST_FORMAT_DEFAULT,
dec->granulepos, &time_format, &time)
&& theora_dec_src_convert (dec->srcpad, GST_FORMAT_TIME, time,
&default_format, &start_value)
&& theora_dec_src_convert (dec->srcpad, GST_FORMAT_TIME, time,
&bytes_format, &bytes)) {
gst_pad_push_event (dec->srcpad,
gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
time, GST_FORMAT_DEFAULT, start_value, GST_FORMAT_BYTES,
bytes, 0));
/* store new framenumber */
dec->packetno = start_value + 3;
} else {
GST_ERROR_OBJECT (dec,
"failed to parse data for DISCONT event, not sending any");
}
/* sync to keyframe */
dec->need_keyframe = TRUE;
}
GST_STREAM_UNLOCK (pad);
gst_event_unref (event);
break;
default:
ret = gst_pad_event_default (dec->sinkpad, event);
break;
}
return ret;
}
#define ROUND_UP_2(x) (((x) + 1) & ~1)
#define ROUND_UP_4(x) (((x) + 3) & ~3)
#define ROUND_UP_8(x) (((x) + 7) & ~7)
static GstFlowReturn
theora_handle_comment_packet (GstTheoraDec * dec, ogg_packet * packet)
{
gchar *encoder = NULL;
GstBuffer *buf;
GstTagList *list;
GST_DEBUG ("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_NOMINAL_BITRATE, dec->info.target_bitrate,
GST_TAG_VIDEO_CODEC, "Theora", NULL);
//gst_element_found_tags_for_pad (GST_ELEMENT (dec), dec->srcpad, 0, list);
gst_tag_list_free (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 = ROUND_UP_2 (dec->info.frame_width + (dec->info.offset_x & 1));
dec->height =
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;
}
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", G_TYPE_DOUBLE,
((gdouble) 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->initialized = TRUE;
return GST_FLOW_OK;
}
static GstFlowReturn
theora_handle_header_packet (GstTheoraDec * dec, ogg_packet * packet)
{
GstFlowReturn res;
GST_DEBUG ("parsing header packet");
if (theora_decode_header (&dec->info, &dec->comment, packet))
goto header_read_error;
switch (packet->packetno) {
case 1:
res = theora_handle_comment_packet (dec, packet);
break;
case 2:
res = theora_handle_type_packet (dec, packet);
break;
default:
/* ignore */
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;
}
}
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 (!dec->initialized)
goto not_initialized;
/* the second most significant bit of the first data byte is cleared
* for keyframes */
keyframe = (packet->packet[0] & 0x40) == 0;
if (keyframe) {
dec->need_keyframe = FALSE;
} else if (dec->need_keyframe) {
goto dropping;
}
if (theora_decode_packetin (&dec->state, packet))
goto could_not_read;
if (theora_decode_YUVout (&dec->state, &yuv) < 0)
goto decode_error;
if ((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 = ROUND_UP_4 (width);
stride_uv = 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 (dec->srcpad, GST_BUFFER_OFFSET_NONE, out_size,
GST_PAD_CAPS (dec->srcpad), &out);
if (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;
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;
}
src_u = yuv.u + dec->offset_x / 2 + dec->offset_y / 2 * yuv.uv_stride;
src_v = yuv.v + dec->offset_x / 2 + dec->offset_y / 2 * yuv.uv_stride;
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->packetno - 4;
GST_BUFFER_OFFSET_END (out) = dec->packetno - 3;
GST_BUFFER_DURATION (out) =
GST_SECOND * ((gdouble) dec->info.fps_denominator) /
dec->info.fps_numerator;
GST_BUFFER_TIMESTAMP (out) = outtime;
result = gst_pad_push (dec->srcpad, out);
return result;
/* ERRORS */
not_initialized:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("no header sent yet (packet no is %d)", packet->packetno));
return GST_FLOW_ERROR;
}
dropping:
{
GST_WARNING_OBJECT (dec, "dropping frame because we need a keyframe");
return GST_FLOW_OK;
}
could_not_read:
{
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("theora decoder did not read data packet"));
return GST_FLOW_ERROR;
}
decode_error:
{
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, DECODE,
(NULL), ("dimensions of image do not match header"));
return GST_FLOW_ERROR;
}
no_buffer:
{
return GST_FLOW_OK;
}
}
static GstFlowReturn
theora_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstTheoraDec *dec;
ogg_packet packet;
guint64 offset_end;
GstClockTime outtime;
GstFlowReturn result = GST_FLOW_OK;
dec = GST_THEORA_DEC (GST_PAD_PARENT (pad));
if (dec->packetno >= 3) {
/* try timestamp first */
outtime = GST_BUFFER_TIMESTAMP (buf);
if (outtime == -1) {
gboolean need_flush = FALSE;
/* the offset end field in theora is actually the time of
* this frame, not the end time */
offset_end = GST_BUFFER_OFFSET_END (buf);
GST_DEBUG_OBJECT (dec, "got buffer with granule %lld", offset_end);
if (offset_end != -1) {
if (dec->granulepos == -1) {
GST_DEBUG_OBJECT (dec, "first buffer with granule");
need_flush = TRUE;
}
dec->granulepos = offset_end;
}
if (dec->granulepos == -1) {
/* we need to wait for a buffer with at least a timestamp or an
* offset before we can generate valid timestamps */
dec->queued = g_list_append (dec->queued, buf);
GST_DEBUG_OBJECT (dec, "queued buffer");
return GST_FLOW_OK;
} else {
/* granulepos to time */
outtime =
GST_SECOND * theora_granule_time (&dec->state, dec->granulepos);
GST_DEBUG_OBJECT (dec, "granulepos=%lld outtime=%" GST_TIME_FORMAT,
dec->granulepos, GST_TIME_ARGS (outtime));
if (need_flush) {
GList *walk;
GstClockTime patch;
gint64 len;
gint64 old_granule = dec->granulepos;
dec->granulepos = -1;
len = g_list_length (dec->queued);
GST_DEBUG_OBJECT (dec, "first buffer with granule, flushing");
/* now resubmit all queued buffers with corrected timestamps */
for (walk = dec->queued; walk; walk = g_list_next (walk)) {
GstBuffer *qbuffer = GST_BUFFER (walk->data);
patch = outtime - (GST_SECOND * len * dec->info.fps_denominator) /
dec->info.fps_numerator,
GST_DEBUG_OBJECT (dec, "patch buffer %lld %lld", len, patch);
GST_BUFFER_TIMESTAMP (qbuffer) = patch;
/* buffers are unreffed in chain function */
theora_dec_chain (pad, qbuffer);
len--;
}
g_list_free (dec->queued);
dec->queued = NULL;
dec->granulepos = old_granule;
}
}
} else {
GST_DEBUG_OBJECT (dec, "got buffer with timestamp %lld", outtime);
}
} else {
/* we don't know yet */
outtime = -1;
}
/* make ogg_packet out of the buffer */
packet.packet = GST_BUFFER_DATA (buf);
packet.bytes = GST_BUFFER_SIZE (buf);
packet.granulepos = dec->granulepos;
packet.packetno = dec->packetno;
packet.b_o_s = (packet.packetno == 0) ? 1 : 0;
packet.e_o_s = 0;
GST_DEBUG_OBJECT (dec, "header=%d packetno=%lld, outtime=%" GST_TIME_FORMAT,
packet.packet[0], packet.packetno, GST_TIME_ARGS (outtime));
/* switch depending on packet type */
if (packet.packet[0] & 0x80) {
if (packet.packetno > 3) {
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, outtime);
}
done:
dec->packetno++;
_inc_granulepos (dec);
gst_buffer_unref (buf);
return result;
}
static GstElementStateReturn
theora_dec_change_state (GstElement * element)
{
GstTheoraDec *dec = GST_THEORA_DEC (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
theora_info_init (&dec->info);
theora_comment_init (&dec->comment);
dec->need_keyframe = TRUE;
dec->initialized = FALSE;
dec->granulepos = -1;
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
theora_clear (&dec->state);
theora_comment_clear (&dec->comment);
theora_info_clear (&dec->info);
dec->packetno = 0;
dec->granulepos = -1;
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
return parent_class->change_state (element);
}
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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