mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-02 22:46:35 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/ext/mpeg2dec/gstmpeg2dec.c
Thomas Vander Stichele 2ce3a35e15 change NULL to (NULL) for GST_ELEMENT_ERROR 
Original commit message from CVS:
change NULL to (NULL) for GST_ELEMENT_ERROR
Make sure errors end with "."
2004-02-02 17:23:32 +00:00

1118 lines
31 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 <string.h>
#include <inttypes.h>
#include "gstmpeg2dec.h"
/* mpeg2dec changed a struct name after 0.3.1, here's a workaround */
/* mpeg2dec also only defined MPEG2_RELEASE after 0.3.1
#if MPEG2_RELEASE < MPEG2_VERSION(0,3,2)
*/
#ifndef MPEG2_RELEASE
#define MPEG2_VERSION(a,b,c) ((((a)&0xff)<<16)|(((b)&0xff)<<8)|((c)&0xff))
#define MPEG2_RELEASE MPEG2_VERSION(0,3,1)
typedef picture_t mpeg2_picture_t;
typedef gint mpeg2_state_t;
#define STATE_BUFFER 0
#endif
GST_DEBUG_CATEGORY_EXTERN (GST_CAT_SEEK);
/* elementfactory information */
static GstElementDetails gst_mpeg2dec_details = {
"mpeg1 and mpeg2 video decoder",
"Codec/Decoder/Video",
"Uses libmpeg2 to decode MPEG video streams",
"Wim Taymans <wim.taymans@chello.be>",
};
/* Mpeg2dec signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static GstStaticPadTemplate src_template_factory =
GST_STATIC_PAD_TEMPLATE (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv, "
"format = (fourcc) { YV12, I420 }, "
"width = (int) [ 16, 4096 ], "
"height = (int) [ 16, 4096 ], "
"pixel_width = (int) [ 1, 255 ], "
"pixel_height = (int) [ 1, 255 ], "
"framerate = (double) { 23.976024, 24.0, "
"25.0, 29.970030, 30.0, 50.0, 59.940060, 60.0 }")
);
static GstStaticPadTemplate user_data_template_factory =
GST_STATIC_PAD_TEMPLATE (
"user_data",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY
);
static GstStaticPadTemplate sink_template_factory =
GST_STATIC_PAD_TEMPLATE (
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) [ 1, 2 ], "
"systemstream = (boolean) false"
)
);
static void gst_mpeg2dec_base_init (gpointer g_class);
static void gst_mpeg2dec_class_init (GstMpeg2decClass *klass);
static void gst_mpeg2dec_init (GstMpeg2dec *mpeg2dec);
static void gst_mpeg2dec_dispose (GObject *object);
static void gst_mpeg2dec_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_mpeg2dec_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static void gst_mpeg2dec_set_index (GstElement *element, GstIndex *index);
static GstIndex* gst_mpeg2dec_get_index (GstElement *element);
static const GstFormat*
gst_mpeg2dec_get_src_formats (GstPad *pad);
static const GstEventMask*
gst_mpeg2dec_get_src_event_masks (GstPad *pad);
static gboolean gst_mpeg2dec_src_event (GstPad *pad, GstEvent *event);
static const GstQueryType*
gst_mpeg2dec_get_src_query_types (GstPad *pad);
static gboolean gst_mpeg2dec_src_query (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value);
static const GstFormat*
gst_mpeg2dec_get_sink_formats (GstPad *pad);
static gboolean gst_mpeg2dec_convert_sink (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value);
static gboolean gst_mpeg2dec_convert_src (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value);
static GstElementStateReturn
gst_mpeg2dec_change_state (GstElement *element);
static void gst_mpeg2dec_chain (GstPad *pad, GstData *_data);
static GstElementClass *parent_class = NULL;
/*static guint gst_mpeg2dec_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_mpeg2dec_get_type (void)
{
static GType mpeg2dec_type = 0;
if (!mpeg2dec_type) {
static const GTypeInfo mpeg2dec_info = {
sizeof(GstMpeg2decClass),
gst_mpeg2dec_base_init,
NULL,
(GClassInitFunc)gst_mpeg2dec_class_init,
NULL,
NULL,
sizeof(GstMpeg2dec),
0,
(GInstanceInitFunc)gst_mpeg2dec_init,
};
mpeg2dec_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMpeg2dec", &mpeg2dec_info, 0);
}
return mpeg2dec_type;
}
static void
gst_mpeg2dec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_template_factory));
gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_template_factory));
gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&user_data_template_factory));
gst_element_class_set_details (element_class, &gst_mpeg2dec_details);
}
static void
gst_mpeg2dec_class_init(GstMpeg2decClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
gobject_class->set_property = gst_mpeg2dec_set_property;
gobject_class->get_property = gst_mpeg2dec_get_property;
gobject_class->dispose = gst_mpeg2dec_dispose;
gstelement_class->change_state = gst_mpeg2dec_change_state;
gstelement_class->set_index = gst_mpeg2dec_set_index;
gstelement_class->get_index = gst_mpeg2dec_get_index;
}
static void
gst_mpeg2dec_init (GstMpeg2dec *mpeg2dec)
{
/* create the sink and src pads */
mpeg2dec->sinkpad = gst_pad_new_from_template (
gst_static_pad_template_get (&sink_template_factory), "sink");
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->sinkpad);
gst_pad_set_chain_function (mpeg2dec->sinkpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_chain));
gst_pad_set_formats_function (mpeg2dec->sinkpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_sink_formats));
gst_pad_set_convert_function (mpeg2dec->sinkpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_convert_sink));
mpeg2dec->srcpad = gst_pad_new_from_template (
gst_static_pad_template_get (&src_template_factory), "src");
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->srcpad);
gst_pad_use_explicit_caps (mpeg2dec->srcpad);
gst_pad_set_formats_function (mpeg2dec->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_src_formats));
gst_pad_set_event_mask_function (mpeg2dec->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_src_event_masks));
gst_pad_set_event_function (mpeg2dec->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_src_event));
gst_pad_set_query_type_function (mpeg2dec->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_src_query_types));
gst_pad_set_query_function (mpeg2dec->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_src_query));
gst_pad_set_convert_function (mpeg2dec->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg2dec_convert_src));
mpeg2dec->userdatapad = gst_pad_new_from_template (
gst_static_pad_template_get (&user_data_template_factory), "user_data");
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->userdatapad);
/* initialize the mpeg2dec acceleration */
mpeg2_accel (MPEG2_ACCEL_DETECT);
mpeg2dec->closed = TRUE;
mpeg2dec->have_fbuf = FALSE;
GST_FLAG_SET (GST_ELEMENT (mpeg2dec), GST_ELEMENT_EVENT_AWARE);
}
static void
gst_mpeg2dec_close_decoder (GstMpeg2dec *mpeg2dec)
{
if (!mpeg2dec->closed) {
mpeg2_close (mpeg2dec->decoder);
mpeg2dec->closed = TRUE;
mpeg2dec->decoder = NULL;
}
}
static void
gst_mpeg2dec_open_decoder (GstMpeg2dec *mpeg2dec)
{
gst_mpeg2dec_close_decoder (mpeg2dec);
mpeg2dec->decoder = mpeg2_init ();
mpeg2dec->closed = FALSE;
mpeg2dec->have_fbuf = FALSE;
}
static void
gst_mpeg2dec_dispose (GObject *object)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (object);
gst_mpeg2dec_close_decoder (mpeg2dec);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_mpeg2dec_set_index (GstElement *element, GstIndex *index)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
mpeg2dec->index = index;
gst_index_get_writer_id (index, GST_OBJECT (element), &mpeg2dec->index_id);
}
static GstIndex*
gst_mpeg2dec_get_index (GstElement *element)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
return mpeg2dec->index;
}
static GstBuffer*
gst_mpeg2dec_alloc_buffer (GstMpeg2dec *mpeg2dec, const mpeg2_info_t *info, gint64 offset)
{
GstBuffer *outbuf = NULL;
gint size = mpeg2dec->width * mpeg2dec->height;
guint8 *buf[3], *out;
const mpeg2_picture_t *picture;
outbuf = gst_buffer_new_and_alloc ((size * 3) / 2);
out = GST_BUFFER_DATA (outbuf);
buf[0] = out;
if (mpeg2dec->format == MPEG2DEC_FORMAT_I420) {
buf[1] = buf[0] + size;
buf[2] = buf[1] + size/4;
}
else {
buf[2] = buf[0] + size;
buf[1] = buf[2] + size/4;
}
gst_buffer_ref (outbuf);
mpeg2_set_buf (mpeg2dec->decoder, buf, outbuf);
picture = info->current_picture;
if (picture && (picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_I) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_KEY_UNIT);
}
else {
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_KEY_UNIT);
}
/* we store the original byteoffset of this picture in the stream here
* because we need it for indexing */
GST_BUFFER_OFFSET (outbuf) = offset;
return outbuf;
}
static gboolean
gst_mpeg2dec_negotiate_format (GstMpeg2dec *mpeg2dec)
{
GstCaps *caps;
guint32 fourcc;
gboolean ret;
if (!GST_PAD_IS_LINKED (mpeg2dec->srcpad)) {
mpeg2dec->format = MPEG2DEC_FORMAT_I420;
return TRUE;
}
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_STR_FOURCC ("I420"),
"width", G_TYPE_INT, mpeg2dec->width,
"height", G_TYPE_INT, mpeg2dec->height,
"pixel_width", G_TYPE_INT, mpeg2dec->pixel_width,
"pixel_height", G_TYPE_INT, mpeg2dec->pixel_height,
"framerate", G_TYPE_DOUBLE, 1. * GST_SECOND / mpeg2dec->frame_period,
NULL);
ret = gst_pad_set_explicit_caps (mpeg2dec->srcpad, caps);
if (!ret) return FALSE;
/* it worked, try to find what it was again */
gst_structure_get_fourcc (gst_caps_get_structure (caps,0),
"format", &fourcc);
if (fourcc == GST_STR_FOURCC ("I420")) {
mpeg2dec->format = MPEG2DEC_FORMAT_I420;
} else {
mpeg2dec->format = MPEG2DEC_FORMAT_YV12;
}
return TRUE;
}
#if 0
static void
update_streaminfo (GstMpeg2dec *mpeg2dec)
{
GstCaps *caps;
GstProps *props;
GstPropsEntry *entry;
const mpeg2_info_t *info;
info = mpeg2_info (mpeg2dec->decoder);
props = gst_props_empty_new ();
entry = gst_props_entry_new ("framerate", G_TYPE_DOUBLE (GST_SECOND/(float)mpeg2dec->frame_period));
gst_props_add_entry (props, entry);
entry = gst_props_entry_new ("bitrate", G_TYPE_INT (info->sequence->byte_rate * 8));
gst_props_add_entry (props, entry);
caps = gst_caps_new ("mpeg2dec_streaminfo",
"application/x-gst-streaminfo",
props);
gst_caps_replace_sink (&mpeg2dec->streaminfo, caps);
g_object_notify (G_OBJECT (mpeg2dec), "streaminfo");
}
#endif
static void
gst_mpeg2dec_flush_decoder (GstMpeg2dec *mpeg2dec)
{
mpeg2_state_t state;
if (mpeg2dec->decoder) {
const mpeg2_info_t *info = mpeg2_info (mpeg2dec->decoder);
do {
state = mpeg2_parse (mpeg2dec->decoder);
if (state == STATE_END) {
if (info->discard_fbuf && info->discard_fbuf->id) {
gst_buffer_unref ((GstBuffer *)info->discard_fbuf->id);
}
}
}
while (state != STATE_BUFFER && state != -1);
}
}
static void
gst_mpeg2dec_chain (GstPad *pad, GstData *_data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
guint32 size;
guint8 *data, *end;
gint64 pts;
const mpeg2_info_t *info;
mpeg2_state_t state;
gboolean done = FALSE;
if (GST_IS_EVENT (buf)) {
GstEvent *event = GST_EVENT (buf);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
{
GST_DEBUG ("discont");
mpeg2dec->next_time = 0;
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
gst_mpeg2dec_flush_decoder (mpeg2dec);
gst_pad_event_default (pad, event);
return;
}
case GST_EVENT_EOS:
if (mpeg2dec->index && mpeg2dec->closed) {
gst_index_commit (mpeg2dec->index, mpeg2dec->index_id);
}
default:
gst_pad_event_default (pad, event);
return;
}
}
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
pts = GST_BUFFER_TIMESTAMP (buf);
info = mpeg2_info (mpeg2dec->decoder);
end = data + size;
if (pts != -1) {
gint64 mpeg_pts = GSTTIME_TO_MPEGTIME (pts);
GST_DEBUG ("have pts: %" G_GINT64_FORMAT " (%" G_GINT64_FORMAT ")",
mpeg_pts, MPEGTIME_TO_GSTTIME (mpeg_pts));
#if MPEG2_RELEASE >= MPEG2_VERSION(0,4,0)
mpeg2_tag_picture (mpeg2dec->decoder, mpeg_pts&0xffffffff, mpeg_pts>>32);
#else
mpeg2_pts (mpeg2dec->decoder, mpeg_pts);
#endif
}
else {
GST_DEBUG ("no pts");
}
GST_DEBUG ("calling _buffer");
mpeg2_buffer (mpeg2dec->decoder, data, end);
GST_DEBUG ("calling _buffer done");
while (!done) {
gboolean slice = FALSE;
GST_DEBUG ("calling parse");
state = mpeg2_parse (mpeg2dec->decoder);
GST_DEBUG ("parse state %d", state);
switch (state) {
case STATE_SEQUENCE:
{
mpeg2dec->width = info->sequence->width;
mpeg2dec->height = info->sequence->height;
mpeg2dec->pixel_width = info->sequence->pixel_width;
mpeg2dec->pixel_height = info->sequence->pixel_height;
mpeg2dec->total_frames = 0;
mpeg2dec->frame_period = info->sequence->frame_period * GST_USECOND / 27;
GST_DEBUG ("sequence flags: %d, frame period: %d",
info->sequence->flags, info->sequence->frame_period);
GST_DEBUG ("profile: %02x, colour_primaries: %d",
info->sequence->profile_level_id, info->sequence->colour_primaries);
GST_DEBUG ("transfer chars: %d, matrix coef: %d",
info->sequence->transfer_characteristics, info->sequence->matrix_coefficients);
if (!gst_mpeg2dec_negotiate_format (mpeg2dec)) {
GST_ELEMENT_ERROR (mpeg2dec, CORE, NEGOTIATION, (NULL), (NULL));
goto exit;
}
if (!mpeg2dec->have_fbuf) {
/* alloc 3 buffers */
gst_mpeg2dec_alloc_buffer (mpeg2dec, info, GST_BUFFER_OFFSET (buf));
gst_mpeg2dec_alloc_buffer (mpeg2dec, info, GST_BUFFER_OFFSET (buf));
gst_mpeg2dec_alloc_buffer (mpeg2dec, info, GST_BUFFER_OFFSET (buf));
mpeg2dec->have_fbuf = TRUE;
}
mpeg2dec->need_sequence = FALSE;
if (mpeg2dec->pending_event) {
done = GST_EVENT_SEEK_FLAGS (mpeg2dec->pending_event) & GST_SEEK_FLAG_FLUSH;
gst_mpeg2dec_src_event (mpeg2dec->srcpad, mpeg2dec->pending_event);
mpeg2dec->pending_event = NULL;
}
break;
}
case STATE_SEQUENCE_REPEATED:
GST_DEBUG ("sequence repeated");
case STATE_GOP:
break;
case STATE_PICTURE:
{
gboolean key_frame = FALSE;
GstBuffer *outbuf;
if (info->current_picture) {
key_frame = (info->current_picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_I;
}
outbuf = gst_mpeg2dec_alloc_buffer (mpeg2dec, info, GST_BUFFER_OFFSET (buf));
GST_DEBUG ("picture %d, %p, %" G_GINT64_FORMAT ", %" G_GINT64_FORMAT,
key_frame, outbuf, GST_BUFFER_OFFSET (outbuf), pts);
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_PICTURE && key_frame)
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_KEYFRAME;
if (!GST_PAD_IS_USABLE (mpeg2dec->srcpad))
mpeg2_skip (mpeg2dec->decoder, 1);
else
mpeg2_skip (mpeg2dec->decoder, 0);
break;
}
case STATE_SLICE_1ST:
GST_DEBUG ("slice 1st");
break;
case STATE_PICTURE_2ND:
GST_DEBUG ("picture second");
break;
case STATE_SLICE:
slice = TRUE;
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 4, 0)
case STATE_INVALID_END:
#endif
case STATE_END:
{
GstBuffer *outbuf = NULL;
gboolean skip = FALSE;
if (!slice) {
mpeg2dec->need_sequence = TRUE;
}
GST_DEBUG ("picture end %p %p %p %p", info->display_fbuf, info->display_picture, info->current_picture,
(info->display_fbuf ? info->display_fbuf->id : NULL));
if (info->display_fbuf && info->display_fbuf->id) {
const mpeg2_picture_t *picture;
gboolean key_frame = FALSE;
outbuf = (GstBuffer *) info->display_fbuf->id;
picture = info->display_picture;
key_frame = (picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_I;
GST_DEBUG ("picture keyfame %d", key_frame);
if (key_frame) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_KEY_UNIT);
}
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_KEYFRAME && key_frame)
mpeg2dec->discont_state = MPEG2DEC_DISC_NONE;
#if MPEG2_RELEASE < MPEG2_VERSION(0,4,0)
if (picture->flags & PIC_FLAG_PTS) {
GstClockTime time = MPEGTIME_TO_GSTTIME (picture->pts);
#else
if (picture->flags & PIC_FLAG_TAGS) {
GstClockTime time = MPEGTIME_TO_GSTTIME ((guint64) picture->tag2 << 32 | picture->tag);
#endif
GST_DEBUG ("picture had pts %" G_GINT64_FORMAT, time);
GST_BUFFER_TIMESTAMP (outbuf) = mpeg2dec->next_time = time;
}
else {
GST_DEBUG ("picture didn't have pts using %" G_GINT64_FORMAT, mpeg2dec->next_time);
GST_BUFFER_TIMESTAMP (outbuf) = mpeg2dec->next_time;
}
mpeg2dec->next_time += (mpeg2dec->frame_period * picture->nb_fields) >> 1;
GST_DEBUG ("picture: %s %s fields:%d off:%" G_GINT64_FORMAT " ts:%" G_GINT64_FORMAT,
(picture->flags & PIC_FLAG_TOP_FIELD_FIRST ? "tff " : " "),
(picture->flags & PIC_FLAG_PROGRESSIVE_FRAME ? "prog" : " "),
picture->nb_fields,
GST_BUFFER_OFFSET (outbuf),
GST_BUFFER_TIMESTAMP (outbuf));
if (mpeg2dec->index) {
gst_index_add_association (mpeg2dec->index, mpeg2dec->index_id,
(key_frame ? GST_ASSOCIATION_FLAG_KEY_UNIT : 0),
GST_FORMAT_BYTES, GST_BUFFER_OFFSET (outbuf),
GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (outbuf), 0);
}
if (picture->flags & PIC_FLAG_SKIP ||
!GST_PAD_IS_USABLE (mpeg2dec->srcpad) ||
mpeg2dec->discont_state != MPEG2DEC_DISC_NONE ||
mpeg2dec->next_time < mpeg2dec->segment_start ||
skip)
{
gst_buffer_unref (outbuf);
}
else {
/* TODO set correct offset here based on frame number */
GST_BUFFER_DURATION (outbuf) = mpeg2dec->frame_period;
gst_pad_push (mpeg2dec->srcpad, GST_DATA (outbuf));
}
}
if (info->discard_fbuf && info->discard_fbuf->id) {
gst_buffer_unref ((GstBuffer *)info->discard_fbuf->id);
}
break;
}
/* need more data */
case STATE_BUFFER:
case -1:
done = TRUE;
break;
/* error */
case STATE_INVALID:
g_warning ("mpeg2dec: decoding error");
/* it looks like setting a new frame in libmpeg2 avoids a crash */
/* FIXME figure out how this screws up sync and buffer leakage */
gst_mpeg2dec_alloc_buffer (mpeg2dec, info, GST_BUFFER_OFFSET (buf));
break;
default:
g_warning ("%s: unhandled state %d, FIXME",
gst_element_get_name (GST_ELEMENT (mpeg2dec)),
state);
break;
}
/*
* FIXME: should pass more information such as state the user data is from
*/
if (info->user_data_len > 0) {
if (GST_PAD_IS_USABLE (mpeg2dec->userdatapad)) {
GstBuffer *udbuf = gst_buffer_new_and_alloc (info->user_data_len);
memcpy (GST_BUFFER_DATA (udbuf), info->user_data, info->user_data_len);
gst_pad_push (mpeg2dec->userdatapad, GST_DATA (udbuf));
}
}
}
exit:
gst_buffer_unref(buf);
}
static const GstFormat*
gst_mpeg2dec_get_sink_formats (GstPad *pad)
{
static const GstFormat formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
return formats;
}
static gboolean
gst_mpeg2dec_convert_sink (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
const mpeg2_info_t *info;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
if (mpeg2dec->decoder == NULL)
return FALSE;
info = mpeg2_info (mpeg2dec->decoder);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
if (info->sequence && info->sequence->byte_rate) {
*dest_value = GST_SECOND * src_value / info->sequence->byte_rate;
break;
}
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
if (info->sequence && info->sequence->byte_rate) {
*dest_value = src_value * info->sequence->byte_rate / GST_SECOND;
break;
}
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static const GstFormat*
gst_mpeg2dec_get_src_formats (GstPad *pad)
{
static const GstFormat formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
GST_FORMAT_DEFAULT,
0
};
return formats;
}
static gboolean
gst_mpeg2dec_convert_src (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
const mpeg2_info_t *info;
guint64 scale = 1;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
if (mpeg2dec->decoder == NULL)
return FALSE;
info = mpeg2_info (mpeg2dec->decoder);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
scale = 6 * (mpeg2dec->width * mpeg2dec->height >> 2);
case GST_FORMAT_DEFAULT:
if (info->sequence && mpeg2dec->frame_period) {
*dest_value = src_value * scale / mpeg2dec->frame_period;
break;
}
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * mpeg2dec->frame_period;
break;
case GST_FORMAT_BYTES:
*dest_value = src_value * 6 * ((mpeg2dec->width * mpeg2dec->height) >> 2);
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static const GstQueryType*
gst_mpeg2dec_get_src_query_types (GstPad *pad)
{
static const GstQueryType types[] = {
GST_QUERY_TOTAL,
GST_QUERY_POSITION,
0
};
return types;
}
static gboolean
gst_mpeg2dec_src_query (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
static const GstFormat *formats;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
switch (type) {
case GST_QUERY_TOTAL:
{
switch (*format) {
case GST_FORMAT_TIME:
case GST_FORMAT_BYTES:
case GST_FORMAT_DEFAULT:
{
res = FALSE;
/* get our peer formats */
formats = gst_pad_get_formats (GST_PAD_PEER (mpeg2dec->sinkpad));
/* while we did not exhaust our seek formats without result */
while (formats && *formats) {
GstFormat peer_format;
gint64 peer_value;
peer_format = *formats;
/* do the probe */
if (gst_pad_query (GST_PAD_PEER (mpeg2dec->sinkpad), GST_QUERY_TOTAL,
&peer_format, &peer_value))
{
GstFormat conv_format;
/* convert to TIME */
conv_format = GST_FORMAT_TIME;
res = gst_pad_convert (mpeg2dec->sinkpad,
peer_format, peer_value,
&conv_format, value);
/* and to final format */
res &= gst_pad_convert (pad,
GST_FORMAT_TIME, *value,
format, value);
}
formats++;
}
break;
}
default:
res = FALSE;
break;
}
break;
}
case GST_QUERY_POSITION:
{
switch (*format) {
default:
res = gst_pad_convert (pad,
GST_FORMAT_TIME, mpeg2dec->next_time,
format, value);
break;
}
break;
}
default:
res = FALSE;
break;
}
return res;
}
static const GstEventMask*
gst_mpeg2dec_get_src_event_masks (GstPad *pad)
{
static const GstEventMask masks[] = {
{ GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH },
{ GST_EVENT_NAVIGATION, GST_EVENT_FLAG_NONE },
{ 0, }
};
return masks;
}
static gboolean
index_seek (GstPad *pad, GstEvent *event)
{
GstIndexEntry *entry;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
entry = gst_index_get_assoc_entry (mpeg2dec->index, mpeg2dec->index_id,
GST_INDEX_LOOKUP_BEFORE, GST_ASSOCIATION_FLAG_KEY_UNIT,
GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event));
if (entry) {
const GstFormat *peer_formats, *try_formats;
/* since we know the exaxt byteoffset of the frame, make sure to seek on bytes first */
const GstFormat try_all_formats[] =
{
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
try_formats = try_all_formats;
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mpeg2dec->sinkpad));
while (gst_formats_contains (peer_formats, *try_formats)) {
gint64 value;
if (gst_index_entry_assoc_map (entry, *try_formats, &value)) {
GstEvent *seek_event;
GST_CAT_DEBUG (GST_CAT_SEEK, "index %s %" G_GINT64_FORMAT
" -> %s %" G_GINT64_FORMAT,
gst_format_get_details (GST_EVENT_SEEK_FORMAT (event))->nick,
GST_EVENT_SEEK_OFFSET (event),
gst_format_get_details (*try_formats)->nick,
value);
/* lookup succeeded, create the seek */
seek_event = gst_event_new_seek (*try_formats | GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH, value);
/* do the seekk */
if (gst_pad_send_event (GST_PAD_PEER (mpeg2dec->sinkpad), seek_event)) {
/* seek worked, we're done, loop will exit */
gst_mpeg2dec_flush_decoder (mpeg2dec);
mpeg2dec->segment_start = GST_EVENT_SEEK_OFFSET (event);
return TRUE;
}
}
try_formats++;
}
}
return FALSE;
}
static gboolean
normal_seek (GstPad *pad, GstEvent *event)
{
gint64 src_offset;
gboolean flush;
GstFormat format;
const GstFormat *peer_formats;
gboolean res = FALSE;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
format = GST_FORMAT_TIME;
/* first bring the src_format to TIME */
if (!gst_pad_convert (pad,
GST_EVENT_SEEK_FORMAT (event), GST_EVENT_SEEK_OFFSET (event),
&format, &src_offset))
{
/* didn't work, probably unsupported seek format then */
return res;
}
/* shave off the flush flag, we'll need it later */
flush = GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH;
/* get our peer formats */
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mpeg2dec->sinkpad));
/* while we did not exhaust our seek formats without result */
while (peer_formats && *peer_formats) {
gint64 desired_offset;
format = *peer_formats;
/* try to convert requested format to one we can seek with on the sinkpad */
if (gst_pad_convert (mpeg2dec->sinkpad, GST_FORMAT_TIME, src_offset, &format, &desired_offset))
{
GstEvent *seek_event;
/* conversion succeeded, create the seek */
seek_event = gst_event_new_seek (format | GST_SEEK_METHOD_SET | flush, desired_offset);
/* do the seekk */
if (gst_pad_send_event (GST_PAD_PEER (mpeg2dec->sinkpad), seek_event)) {
/* seek worked, we're done, loop will exit */
mpeg2dec->segment_start = GST_EVENT_SEEK_OFFSET (event);
res = TRUE;
break;
}
}
peer_formats++;
}
/* at this point, either the seek worked and res = TRUE or res == FALSE and the seek
* failed */
if (res && flush) {
/* if we need to flush, iterate until the buffer is empty */
gst_mpeg2dec_flush_decoder (mpeg2dec);
}
return res;
}
static gboolean
gst_mpeg2dec_src_event (GstPad *pad, GstEvent *event)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
if (mpeg2dec->decoder == NULL)
return FALSE;
switch (GST_EVENT_TYPE (event)) {
/* the all-formats seek logic */
case GST_EVENT_SEEK:
if (mpeg2dec->need_sequence) {
mpeg2dec->pending_event = event;
return TRUE;
}
else {
if (mpeg2dec->index)
res = index_seek (pad, event);
else
res = normal_seek (pad, event);
if (res)
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
}
break;
case GST_EVENT_NAVIGATION:
/* Forward a navigation event unchanged */
return gst_pad_send_event (GST_PAD_PEER (mpeg2dec->sinkpad), event);
default:
res = FALSE;
break;
}
gst_event_unref (event);
return res;
}
static GstElementStateReturn
gst_mpeg2dec_change_state (GstElement *element)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
{
mpeg2dec->next_time = 0;
/* reset the initial video state */
mpeg2dec->format = MPEG2DEC_FORMAT_NONE;
mpeg2dec->width = -1;
mpeg2dec->height = -1;
mpeg2dec->segment_start = 0;
mpeg2dec->segment_end = -1;
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
mpeg2dec->frame_period = 0;
gst_mpeg2dec_open_decoder (mpeg2dec);
mpeg2dec->need_sequence = TRUE;
break;
}
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
gst_mpeg2dec_close_decoder (mpeg2dec);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
}
static void
gst_mpeg2dec_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstMpeg2dec *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MPEG2DEC (object));
src = GST_MPEG2DEC (object);
switch (prop_id) {
default:
break;
}
}
static void
gst_mpeg2dec_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstMpeg2dec *mpeg2dec;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MPEG2DEC (object));
mpeg2dec = GST_MPEG2DEC (object);
switch (prop_id) {
default:
break;
}
}
static gboolean
plugin_init (GstPlugin *plugin)
{
if (!gst_element_register (plugin, "mpeg2dec", GST_RANK_PRIMARY, GST_TYPE_MPEG2DEC))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mpeg2dec",
"LibMpeg2 decoder",
plugin_init,
VERSION,
"GPL",
GST_PACKAGE,
GST_ORIGIN)
Reference in a new issue View git blame Copy permalink