mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-05 09:00:54 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/ext/theora/theoradec.c

1412 lines
39 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) 2004 Benjamin Otte <in7y118@public.uni-hamburg.de>
* 2006 Michael Smith <msmith@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.
*/
/**
* SECTION:element-theoradecexp
* @see_also: theoradec, theoraenc, oggdemux
*
* This element decodes theora streams into raw video using the theora-exp
* decoder
* <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.
*
* <refsect2>
* <title>Example pipeline</title>
* |[
* gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoraexpdec ! xvimagesink
* ]| This example pipeline will demux an ogg stream and decode the theora video,
* displaying it on screen.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "theoradec.h"
#include <gst/tag/tag.h>
GST_DEBUG_CATEGORY_STATIC (theoradecexp_debug);
#define GST_CAT_DEFAULT theoradecexp_debug
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, YUY2, Y444 }, "
"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 (GstTheoraExpDec, gst_theoradec, GstElement, GST_TYPE_ELEMENT);
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);
static const GstQueryType *theora_get_query_types (GstPad * pad);
static void
gst_theoradec_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_simple (element_class, "Theora video decoder",
"Codec/Decoder/Video",
"decode raw theora streams to raw YUV video using libtheoradec",
"Benjamin Otte <in7y118@public.uni-hamburg.de>, "
"Wim Taymans <wim@fluendo.com>, " "Michael Smith <msmith@fluendo,com>");
}
static void
gst_theoradec_class_init (GstTheoraExpDecClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gstelement_class->change_state = theora_dec_change_state;
GST_DEBUG_CATEGORY_INIT (theoradecexp_debug, "theoradecexp", 0,
"Theora decoder");
}
static void
gst_theoradec_init (GstTheoraExpDec * dec, GstTheoraExpDecClass * 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->queued = NULL;
}
static void
gst_theoradec_reset (GstTheoraExpDec * dec)
{
GList *walk;
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);
for (walk = dec->queued; walk; walk = g_list_next (walk)) {
gst_buffer_unref (GST_BUFFER_CAST (walk->data));
}
g_list_free (dec->queued);
dec->queued = NULL;
}
static gint64
inc_granulepos (GstTheoraExpDec * dec, gint64 granulepos)
{
gint framecount;
if (granulepos == -1)
return -1;
framecount = th_granule_frame (dec->dec, granulepos);
return (framecount + 1) << dec->info.keyframe_granule_shift;
}
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 GstClockTime
gst_theoradec_granule_clocktime (GstTheoraExpDec * dec, ogg_int64_t granulepos)
{
/* Avoid using theora_granule_time, which returns a double (in seconds); not
* what we want
*/
if (granulepos >= 0) {
guint64 framecount = th_granule_frame (dec->dec, granulepos);
return gst_util_uint64_scale_int (framecount * GST_SECOND,
dec->info.fps_denominator, dec->info.fps_numerator);
}
return -1;
}
static gboolean
theora_dec_src_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstTheoraExpDec *dec;
guint64 scale = 1;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
dec = GST_THEORA_DEC_EXP (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, 8,
dec->info.pic_height * dec->info.pic_width * dec->output_bpp);
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 = dec->output_bpp *
(dec->info.pic_width * dec->info.pic_height) / 8;
case GST_FORMAT_DEFAULT:
if (dec->info.fps_numerator && dec->info.fps_denominator)
*dest_value = scale * gst_util_uint64_scale (src_value,
dec->info.fps_numerator,
dec->info.fps_denominator * GST_SECOND);
else
res = FALSE;
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
if (dec->info.fps_numerator && dec->info.fps_denominator)
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * dec->info.fps_denominator,
dec->info.fps_numerator);
else
res = FALSE;
break;
case GST_FORMAT_BYTES:
*dest_value = gst_util_uint64_scale_int (src_value,
dec->output_bpp * dec->info.pic_width * dec->info.pic_height, 8);
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;
GstTheoraExpDec *dec;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
dec = GST_THEORA_DEC_EXP (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 = gst_theoradec_granule_clocktime (dec, src_value);
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
{
guint rest;
if (!dec->info.fps_numerator || !dec->info.fps_denominator) {
res = FALSE;
break;
}
/* 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 / (1 << dec->info.keyframe_granule_shift);
*dest_value -= rest;
*dest_value <<= dec->info.keyframe_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)
{
GstTheoraExpDec *dec;
gboolean res = FALSE;
dec = GST_THEORA_DEC_EXP (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:
{
/* forward to peer for total */
GstPad *peer;
if (!(peer = gst_pad_get_peer (dec->sinkpad)))
goto error;
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;
GstTheoraExpDec *dec;
dec = GST_THEORA_DEC_EXP (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);
gst_event_unref (event);
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 let us save the time for copying and
* cropping the frame. */
GST_OBJECT_LOCK (dec);
dec->proportion = proportion;
dec->earliest_time = timestamp + diff;
GST_OBJECT_UNLOCK (dec);
res = gst_pad_event_default (pad, event);
break;
}
default:
res = gst_pad_event_default (pad, 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;
GstTheoraExpDec *dec;
dec = GST_THEORA_DEC_EXP (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:
/* TODO: Call appropriate func with OC_DECCTL_SET_GRANPOS? */
gst_theoradec_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;
if (rate <= 0.0)
goto newseg_wrong_rate;
/* 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;
}
newseg_wrong_rate:
{
GST_DEBUG_OBJECT (dec, "negative rates not supported yet");
gst_event_unref (event);
goto done;
}
}
static GstFlowReturn
theora_handle_comment_packet (GstTheoraExpDec * 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 (GstTheoraExpDec * dec, ogg_packet * packet)
{
GstCaps *caps;
gint par_num, par_den;
guint32 fourcc;
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 for either is undefined; we're told to assume 1:1 */
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:
*
* frame_width/frame_height : dimension of the encoded frame
* pic_width/pic_height : dimension of the visible part
* pic_x/pic_y : offset in encoded frame where visible part starts
*/
GST_DEBUG_OBJECT (dec, "dimension %dx%d, PAR %d/%d", dec->info.frame_width,
dec->info.frame_height, par_num, par_den);
GST_DEBUG_OBJECT (dec, "pic dimension %dx%d, offset %d:%d",
dec->info.pic_width, dec->info.pic_height,
dec->info.pic_x, dec->info.pic_y);
/* 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.pic_width + (dec->info.pic_x & 1));
dec->height = GST_ROUND_UP_2 (dec->info.pic_height + (dec->info.pic_y & 1));
dec->offset_x = dec->info.pic_x & ~1;
dec->offset_y = dec->info.pic_y & ~1;
GST_DEBUG_OBJECT (dec, "after fixup frame dimension %dx%d, offset %d:%d",
dec->width, dec->height, dec->offset_x, dec->offset_y);
if (dec->info.pixel_fmt == TH_PF_420) {
dec->output_bpp = 12; /* Average bits per pixel. */
/* This is bad. I420 is very specific, and has implicit stride. This means
* we can't use the native output of the decoder, we have to memcpy it to
* an I420 buffer. For now, GStreamer gives us no better alternative.
*/
fourcc = GST_MAKE_FOURCC ('I', '4', '2', '0');
} else if (dec->info.pixel_fmt == TH_PF_422) {
dec->output_bpp = 16;
/* Unfortunately, we don't have a planar 'fourcc' value, which means we
* can't represent the output format of the decoder at all in gstreamer.
* So, we convert to a widely-supported packed format.
*/
fourcc = GST_MAKE_FOURCC ('Y', 'U', 'Y', '2');
} else if (dec->info.pixel_fmt == TH_PF_444) {
dec->output_bpp = 24;
/* As for I420, we can't define the stride for this, so we need to memcpy,
* though at least this is a planar format...
*/
fourcc = GST_MAKE_FOURCC ('Y', '4', '4', '4');
} else {
GST_ERROR_OBJECT (dec, "Invalid pixel format %d", dec->info.pixel_fmt);
return GST_FLOW_ERROR;
}
dec->dec = th_decode_alloc (&dec->info, dec->setup);
th_setup_free (dec->setup);
dec->setup = NULL;
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, fourcc,
"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 (GstTheoraExpDec * dec, ogg_packet * packet)
{
GstFlowReturn res;
int ret;
GST_DEBUG_OBJECT (dec, "parsing header packet");
ret = th_decode_headerin (&dec->info, &dec->comment, &dec->setup, packet);
if (ret < 0)
goto header_read_error;
/* We can never get here unless we have at least a one-byte packet */
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_WARNING_OBJECT (dec, "Header parsing failed: %d", ret);
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, its timestamp and duration will be clipped */
static gboolean
clip_buffer (GstTheoraExpDec * 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 (GstTheoraExpDec * 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");
result = GST_FLOW_OK;
} 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;
}
/* Create a packed 'YUY2' image, push it.
*/
static GstFlowReturn
theora_handle_422_image (GstTheoraExpDec * dec, th_ycbcr_buffer yuv,
GstClockTime outtime)
{
int i, j;
gint width, height;
gint out_size;
gint stride;
GstBuffer *out;
GstFlowReturn result;
width = dec->width;
height = dec->height;
stride = GST_ROUND_UP_2 (width) * 2;
out_size = stride * height;
/* 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 (result != GST_FLOW_OK)
goto no_buffer;
/* The output pixels look like:
* YUYVYUYV....
*
* Do the interleaving... Note that this is kinda messed up if our width is
* odd. In that case, we can't represent it properly in YUY2, so we just
* pad out to even in that case (this is why we have GST_ROUND_UP_2() above).
*/
{
guchar *src_y;
guchar *src_cb;
guchar *src_cr;
guchar *dest;
guchar *curdest;
guchar *src;
dest = GST_BUFFER_DATA (out);
src_y = yuv[0].data + dec->offset_x + dec->offset_y * yuv[0].ystride;
src_cb = yuv[1].data + dec->offset_x / 2 + dec->offset_y * yuv[1].ystride;
src_cr = yuv[2].data + dec->offset_x / 2 + dec->offset_y * yuv[2].ystride;
for (i = 0; i < height; i++) {
/* Y first */
curdest = dest;
src = src_y;
for (j = 0; j < width; j++) {
*curdest = *src++;
curdest += 2;
}
src_y += yuv[0].ystride;
curdest = dest + 1;
src = src_cb;
for (j = 0; j < width; j++) {
*curdest = *src++;
curdest += 4;
}
src_cb += yuv[1].ystride;
curdest = dest + 3;
src = src_cr;
for (j = 0; j < width; j++) {
*curdest = *src++;
curdest += 4;
}
src_cr += yuv[2].ystride;
dest += 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;
return theora_dec_push (dec, out);
no_buffer:
{
GST_DEBUG_OBJECT (dec, "could not get buffer, reason: %s",
gst_flow_get_name (result));
return result;
}
}
/* Get buffer, populate with original data (we must memcpy to get things to
* have the expected strides, etc...), and push.
*/
static GstFlowReturn
theora_handle_444_image (GstTheoraExpDec * dec, th_ycbcr_buffer yuv,
GstClockTime outtime)
{
int i, plane;
gint width, height;
gint out_size;
gint stride;
GstBuffer *out;
GstFlowReturn result;
width = dec->width;
height = dec->height;
/* TODO: Check if we have any special alignment requirements for the planes,
* or for each line within a plane. */
stride = width;
out_size = stride * height * 3;
/* 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 (result != GST_FLOW_OK)
goto no_buffer;
{
guchar *dest, *src;
for (plane = 0; plane < 3; plane++) {
/* TODO: do we have to use something different here? */
dest = GST_BUFFER_DATA (out) + plane * stride * height;
src = yuv[plane].data + dec->offset_x +
dec->offset_y * yuv[plane].ystride;
for (i = 0; i < height; i++) {
memcpy (dest, src, width);
dest += stride;
src += yuv[plane].ystride;
}
}
}
/* FIXME, frame_nr not correct */
GST_BUFFER_OFFSET (out) = dec->frame_nr;
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;
return theora_dec_push (dec, out);
no_buffer:
{
GST_DEBUG_OBJECT (dec, "could not get buffer, reason: %s",
gst_flow_get_name (result));
return result;
}
}
/* Create a (planar, but with special alignment and stride requirements) 'I420'
* buffer, populate, push.
*/
static GstFlowReturn
theora_handle_420_image (GstTheoraExpDec * dec, th_ycbcr_buffer yuv,
GstClockTime outtime)
{
int i;
gint width, height, cwidth, cheight;
gint out_size;
gint stride_y, stride_uv;
GstBuffer *out;
GstFlowReturn result;
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 (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_u, offset_v;
dest_y = GST_BUFFER_DATA (out);
dest_u = dest_y + stride_y * height;
dest_v = dest_u + stride_uv * cheight;
src_y = yuv[0].data + dec->offset_x + dec->offset_y * yuv[0].ystride;
for (i = 0; i < height; i++) {
memcpy (dest_y, src_y, width);
dest_y += stride_y;
src_y += yuv[0].ystride;
}
offset_u = dec->offset_x / 2 + dec->offset_y / 2 * yuv[1].ystride;
offset_v = dec->offset_x / 2 + dec->offset_y / 2 * yuv[2].ystride;
src_u = yuv[1].data + offset_u;
src_v = yuv[2].data + offset_v;
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[1].ystride;
dest_v += stride_uv;
src_v += yuv[2].ystride;
}
}
/* FIXME, frame_nr not correct */
GST_BUFFER_OFFSET (out) = dec->frame_nr;
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;
return theora_dec_push (dec, out);
no_buffer:
{
GST_DEBUG_OBJECT (dec, "could not get buffer, reason: %s",
gst_flow_get_name (result));
return result;
}
}
static GstFlowReturn
theora_handle_data_packet (GstTheoraExpDec * dec, ogg_packet * packet,
GstClockTime outtime)
{
/* normal data packet */
th_ycbcr_buffer yuv;
GstFlowReturn result;
ogg_int64_t gp;
if (G_UNLIKELY (!dec->have_header))
goto not_initialized;
if (th_packet_iskeyframe (packet)) {
dec->need_keyframe = FALSE;
} else if (G_UNLIKELY (dec->need_keyframe)) {
goto dropping;
}
/* this does the decoding */
if (G_UNLIKELY (th_decode_packetin (dec->dec, packet, &gp)))
goto decode_error;
if (outtime != -1) {
gboolean need_skip;
GstClockTime qostime;
/* QoS is 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 (th_decode_ycbcr_out (dec->dec, yuv) < 0))
goto no_yuv;
if (G_UNLIKELY ((yuv[0].width != dec->info.frame_width) ||
(yuv[0].height != dec->info.frame_height)))
goto wrong_dimensions;
if (dec->info.pixel_fmt == TH_PF_420) {
result = theora_handle_420_image (dec, yuv, outtime);
} else if (dec->info.pixel_fmt == TH_PF_422) {
result = theora_handle_422_image (dec, yuv, outtime);
} else if (dec->info.pixel_fmt == TH_PF_444) {
result = theora_handle_444_image (dec, yuv, outtime);
} else {
g_assert_not_reached ();
}
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;
}
}
static GstFlowReturn
theora_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstTheoraExpDec *dec;
ogg_packet packet;
GstFlowReturn result = GST_FLOW_OK;
gboolean isheader;
dec = GST_THEORA_DEC_EXP (gst_pad_get_parent (pad));
/* resync on DISCONT */
if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT))) {
GST_DEBUG_OBJECT (dec, "Received DISCONT buffer");
dec->need_keyframe = TRUE;
dec->last_timestamp = -1;
dec->granulepos = -1;
dec->discont = TRUE;
}
GST_DEBUG ("Offset end is %d, k-g-s %d", (int) (GST_BUFFER_OFFSET_END (buf)),
dec->info.keyframe_granule_shift);
/* 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) {
GST_DEBUG_OBJECT (dec, "Granulepos from packet: %lld", packet.granulepos);
dec->granulepos = packet.granulepos;
dec->last_timestamp =
gst_theoradec_granule_clocktime (dec, packet.granulepos);
} else if (dec->last_timestamp != -1) {
GST_DEBUG_OBJECT (dec, "Granulepos inferred?: %lld", dec->granulepos);
dec->last_timestamp =
gst_theoradec_granule_clocktime (dec, dec->granulepos);
} else {
GST_DEBUG_OBJECT (dec, "Granulepos unknown");
dec->last_timestamp = GST_CLOCK_TIME_NONE;
}
if (dec->last_timestamp == GST_CLOCK_TIME_NONE &&
GST_BUFFER_TIMESTAMP_IS_VALID (buf))
dec->last_timestamp = GST_BUFFER_TIMESTAMP (buf);
} else {
GST_DEBUG_OBJECT (dec, "Granulepos not usable: no headers seen");
dec->last_timestamp = -1;
}
/* A zero-byte packet is a valid data packet, meaning 'duplicate frame' */
if (packet.bytes > 0 && packet.packet[0] & 0x80)
isheader = TRUE;
else
isheader = FALSE;
GST_DEBUG_OBJECT (dec, "header=%d 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 */
if (isheader) {
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);
gst_object_unref (dec);
gst_buffer_unref (buf);
return result;
}
static GstStateChangeReturn
theora_dec_change_state (GstElement * element, GstStateChange transition)
{
GstTheoraExpDec *dec = GST_THEORA_DEC_EXP (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
th_info_init (&dec->info);
th_comment_init (&dec->comment);
dec->have_header = FALSE;
gst_theoradec_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:
th_decode_free (dec->dec);
dec->dec = NULL;
th_comment_clear (&dec->comment);
th_info_clear (&dec->info);
gst_theoradec_reset (dec);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "theoradecexp", GST_RANK_PRIMARY,
gst_theoradec_get_type ()))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"theoradec",
"Theora dec (exp) plugin library",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
Reference in a new issue View git blame Copy permalink