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gstreamer/ext/theora/theoradec.c
Wim Taymans 01c78dfc80 ext/theora/theoradec.c: Don't try to decode frames before we received a keyframe 
Original commit message from CVS:
* ext/theora/theoradec.c: (theora_dec_chain),
(theora_dec_change_state):
Don't try to decode frames before we received a keyframe
2004-06-11 17:34:32 +00:00

484 lines
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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>
#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 need_keyframe;
};
struct _GstTheoraDecClass
{
GstElementClass parent_class;
};
static GstElementDetails theora_dec_details = {
"TheoraDec",
"Codec/Decoder/Video",
"decode raw theora streams to raw YUV video",
"Benjamin Otte <in7y118@public.uni-hamburg.de>",
};
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_chain (GstPad * pad, GstData * data);
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,
GstQueryType query, GstFormat * format, gint64 * value);
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)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gstelement_class->change_state = theora_dec_change_state;
}
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_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_use_explicit_caps (dec->srcpad);
gst_pad_set_event_function (dec->srcpad, theora_dec_src_event);
gst_pad_set_query_function (dec->srcpad, theora_dec_src_query);
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
GST_FLAG_SET (dec, GST_ELEMENT_EVENT_AWARE);
}
/* 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 gboolean
theora_dec_from_granulepos (GstTheoraDec * dec, GstFormat format, guint64 from,
guint64 * to)
{
guint64 framecount;
guint ilog = _theora_ilog (dec->info.keyframe_frequency_force);
if (dec->packetno < 1)
return FALSE;
/* 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 = from >> ilog;
framecount += from - (framecount << ilog);
switch (format) {
case GST_FORMAT_TIME:
*to = framecount =
from * GST_SECOND * dec->info.fps_denominator /
dec->info.fps_numerator;
break;
case GST_FORMAT_DEFAULT:
*to = framecount;
break;
case GST_FORMAT_BYTES:
*to = framecount * dec->info.height * dec->info.width * 12 / 8;
break;
default:
return FALSE;
}
return TRUE;
}
/* FIXME: we can only seek to keyframes... */
static gboolean
theora_dec_to_granulepos (GstTheoraDec * dec, GstFormat format, guint64 from,
guint64 * to)
{
guint64 framecount;
if (dec->packetno < 1)
return FALSE;
switch (format) {
case GST_FORMAT_TIME:
framecount =
from * dec->info.fps_numerator / (GST_SECOND *
dec->info.fps_denominator);
break;
case GST_FORMAT_DEFAULT:
framecount = from;
break;
case GST_FORMAT_BYTES:
framecount = from * 8 / (dec->info.height * dec->info.width * 12);
break;
default:
return FALSE;
}
*to = framecount << _theora_ilog (dec->info.keyframe_frequency_force - 1);
return TRUE;
}
static gboolean
theora_dec_src_query (GstPad * pad, GstQueryType query, GstFormat * format,
gint64 * value)
{
gint64 granulepos;
GstTheoraDec *dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
GstFormat my_format = GST_FORMAT_DEFAULT;
if (!gst_pad_query (GST_PAD_PEER (dec->sinkpad), query, &my_format,
&granulepos))
return FALSE;
if (!theora_dec_from_granulepos (dec, *format, granulepos, value))
return FALSE;
GST_LOG_OBJECT (dec,
"query %u: peer returned granulepos: %llu - we return %llu (format %u)\n",
query, granulepos, *value, *format);
return TRUE;
}
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:{
guint64 value;
res = theora_dec_to_granulepos (dec, GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event), &value);
if (res) {
GstEvent *real_seek = gst_event_new_seek (
(GST_EVENT_SEEK_TYPE (event) & ~GST_SEEK_FORMAT_MASK) |
GST_FORMAT_DEFAULT,
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;
}
static void
theora_dec_event (GstTheoraDec * dec, GstEvent * event)
{
guint64 value, time, bytes;
GST_LOG_OBJECT (dec, "handling event");
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
if (gst_event_discont_get_value (event, GST_FORMAT_DEFAULT, &value)) {
dec->granulepos = value;
GST_DEBUG_OBJECT (dec,
"setting granuleposition to %" G_GUINT64_FORMAT " after discont\n",
value);
} else {
GST_WARNING_OBJECT (dec,
"discont event didn't include offset, we might set it wrong now");
}
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 (dec->srcpad, GST_DATA (gst_event_new_discontinuous (FALSE,
GST_FORMAT_TIME, (guint64) 0, GST_FORMAT_DEFAULT,
(guint64) 0, GST_FORMAT_BYTES, (guint64) 0, 0)));
} else {
dec->packetno = 3;
/* if one of them works, all of them work */
if (theora_dec_from_granulepos (dec, GST_FORMAT_TIME, dec->granulepos,
&time)
&& theora_dec_from_granulepos (dec, GST_FORMAT_DEFAULT,
dec->granulepos, &value)
&& theora_dec_from_granulepos (dec, GST_FORMAT_BYTES,
dec->granulepos, &bytes)) {
gst_pad_push (dec->srcpad,
GST_DATA (gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
time, GST_FORMAT_DEFAULT, value, GST_FORMAT_BYTES, bytes,
0)));
} else {
GST_ERROR_OBJECT (dec,
"failed to parse data for DISCONT event, not sending any");
}
}
break;
default:
break;
}
gst_pad_event_default (dec->sinkpad, event);
}
static void
theora_dec_chain (GstPad * pad, GstData * data)
{
GstBuffer *buf;
GstTheoraDec *dec;
ogg_packet packet;
dec = GST_THEORA_DEC (gst_pad_get_parent (pad));
if (GST_IS_EVENT (data)) {
theora_dec_event (dec, GST_EVENT (data));
return;
}
buf = GST_BUFFER (data);
/* 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 = dec->packetno++;
packet.b_o_s = (packet.packetno == 0) ? 1 : 0;
packet.e_o_s = 0;
/* switch depending on packet type */
if (packet.packet[0] & 0x80) {
/* header packet */
if (theora_decode_header (&dec->info, &dec->comment, &packet)) {
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't read header packet"));
gst_data_unref (data);
return;
}
if (packet.packetno == 1) {
gchar *encoder = NULL;
GstTagList *list =
gst_tag_list_from_vorbiscomment_buffer (buf, "\201theora", 7,
&encoder);
if (!list) {
GST_ERROR_OBJECT (dec, "failed to parse tags");
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, NULL);
gst_element_found_tags_for_pad (GST_ELEMENT (dec), dec->srcpad, 0, list);
} else if (packet.packetno == 2) {
GstCaps *caps;
/* 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,
"width", G_TYPE_INT, dec->info.width, "height", G_TYPE_INT,
dec->info.height, NULL);
gst_pad_set_explicit_caps (dec->srcpad, caps);
gst_caps_free (caps);
}
} else {
/* normal data packet */
yuv_buffer yuv;
GstBuffer *out;
guint8 *y, *v, *u;
guint i;
gboolean keyframe;
/* 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) {
/* drop frames if we're looking for a keyframe */
gst_data_unref (data);
return;
}
#if 0
{
GTimeVal tv;
guint64 time;
g_get_current_time (&tv);
time = GST_TIMEVAL_TO_TIME (tv);
#endif
if (theora_decode_packetin (&dec->state, &packet)) {
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("theora decoder did not read data packet"));
gst_data_unref (data);
return;
}
if (theora_decode_YUVout (&dec->state, &yuv) < 0) {
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't read out YUV image"));
gst_data_unref (data);
return;
}
g_return_if_fail (yuv.y_width == dec->info.width);
g_return_if_fail (yuv.y_height == dec->info.height);
out = gst_pad_alloc_buffer (dec->srcpad, GST_BUFFER_OFFSET_NONE,
yuv.y_width * yuv.y_height * 12 / 8);
y = GST_BUFFER_DATA (out);
u = y + yuv.y_width * yuv.y_height;
v = u + yuv.y_width * yuv.y_height / 4;
for (i = 0; i < yuv.y_height; i++) {
memcpy (y + i * yuv.y_width, yuv.y + i * yuv.y_stride, yuv.y_width);
}
for (i = 0; i < yuv.y_height / 2; i++) {
memcpy (u + i * yuv.uv_width, yuv.u + i * yuv.uv_stride, yuv.uv_width);
memcpy (v + i * yuv.uv_width, yuv.v + i * yuv.uv_stride, yuv.uv_width);
}
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) =
GST_BUFFER_OFFSET (out) * GST_BUFFER_DURATION (out);
#if 0
g_get_current_time (&tv);
time = GST_TIMEVAL_TO_TIME (tv) - time;
if (time > 10000000)
g_print ("w00t, you're sl0000w!! - %llu\n", time);
}
#endif
gst_pad_push (dec->srcpad, GST_DATA (out));
}
gst_data_unref (data);
}
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;
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 = 0;
break;
case GST_STATE_READY_TO_NULL:
break;
default:
g_assert_not_reached ();
break;
}
return parent_class->change_state (element);
}
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