2
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3
* Copyright (C) <2007> Jan Schmidt <thaytan@mad.scientist.com>
5
* This library is free software; you can redistribute it and/or
6
* modify it under the terms of the GNU Library General Public
7
* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
11
* but WITHOUT ANY WARRANTY; without even the implied warranty of
12
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
26
#include "mpegvideoparse.h"
28
/* FIXME: there are still some things to do in this element.
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* + Handle Sequence Display Extension to output the display size
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* rather than the encoded size.
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* + Do all the other stuff (documentation, tests) to get it into
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* - handle seeking in raw elementary streams
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* - calculate timestamps for all un-timestamped frames, taking into
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* account frame re-ordering. Doing this probably requires introducing
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* an extra end-to-end delay however, so might not be really desirable.
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* - Collect a list of regions and the sequence headers that apply
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* to each region so that we properly handle SEQUENCE_END followed
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* by a new sequence. At the moment, the caps will change if the
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* sequence changes, but if we then seek to a different spot it might
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* be wrong. Fortunately almost every stream only has 1 sequence.
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GST_DEBUG_CATEGORY_STATIC (mpv_parse_debug);
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#define GST_CAT_DEFAULT mpv_parse_debug
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/* elementfactory information */
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static GstElementDetails mpegvideoparse_details =
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GST_ELEMENT_DETAILS ("MPEG video elementary stream parser",
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"Parses and frames MPEG-1 and MPEG-2 elementary video streams",
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"Wim Taymans <wim.taymans@chello.be>\n"
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"Jan Schmidt <thaytan@mad.scientist.com>");
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static GstStaticPadTemplate src_template =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
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GST_STATIC_CAPS ("video/mpeg, "
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"mpegversion = (int) [ 1, 2 ], "
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"parsed = (boolean) true, "
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"systemstream = (boolean) false, "
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"width = (int) [ 16, 4096 ], "
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"height = (int) [ 16, 4096 ], "
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"pixel-aspect-ratio = (fraction) [ 0/1, MAX ], "
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"framerate = (fraction) [ 0/1, MAX ]")
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_STATIC_CAPS ("video/mpeg, "
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"mpegversion = (int) [ 1, 2 ], "
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"parsed = (boolean) false, " "systemstream = (boolean) false")
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/* MpegVideoParse signals and args */
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static void gst_mpegvideoparse_class_init (MpegVideoParseClass * klass);
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static void gst_mpegvideoparse_base_init (MpegVideoParseClass * klass);
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static void gst_mpegvideoparse_init (MpegVideoParse * mpegvideoparse);
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static void gst_mpegvideoparse_dispose (GObject * object);
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static GstFlowReturn gst_mpegvideoparse_chain (GstPad * pad, GstBuffer * buf);
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static gboolean mpv_parse_sink_event (GstPad * pad, GstEvent * event);
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static void gst_mpegvideoparse_flush (MpegVideoParse * mpegvideoparse);
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static GstStateChangeReturn
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gst_mpegvideoparse_change_state (GstElement * element,
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GstStateChange transition);
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static void mpv_send_pending_segs (MpegVideoParse * mpegvideoparse);
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static void mpv_clear_pending_segs (MpegVideoParse * mpegvideoparse);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_mpegvideoparse_signals[LAST_SIGNAL] = { 0 }; */
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mpegvideoparse_get_type (void)
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static GType mpegvideoparse_type = 0;
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if (!mpegvideoparse_type) {
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static const GTypeInfo mpegvideoparse_info = {
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sizeof (MpegVideoParseClass),
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(GBaseInitFunc) gst_mpegvideoparse_base_init,
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(GClassInitFunc) gst_mpegvideoparse_class_init,
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sizeof (MpegVideoParse),
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(GInstanceInitFunc) gst_mpegvideoparse_init,
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mpegvideoparse_type =
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g_type_register_static (GST_TYPE_ELEMENT, "MpegVideoParse",
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&mpegvideoparse_info, 0);
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return mpegvideoparse_type;
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gst_mpegvideoparse_base_init (MpegVideoParseClass * klass)
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_set_details (element_class, &mpegvideoparse_details);
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gst_mpegvideoparse_class_init (MpegVideoParseClass * klass)
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gstelement_class = (GstElementClass *) klass;
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gobject_class = G_OBJECT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->dispose = (GObjectFinalizeFunc) (gst_mpegvideoparse_dispose);
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gstelement_class->change_state = gst_mpegvideoparse_change_state;
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mpv_parse_reset (MpegVideoParse * mpegvideoparse)
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mpegvideoparse->seq_hdr.mpeg_version = 0;
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mpegvideoparse->seq_hdr.width = mpegvideoparse->seq_hdr.height = -1;
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mpegvideoparse->seq_hdr.fps_n = mpegvideoparse->seq_hdr.par_w = 0;
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mpegvideoparse->seq_hdr.fps_d = mpegvideoparse->seq_hdr.par_h = 1;
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mpv_clear_pending_segs (mpegvideoparse);
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mpv_send_pending_segs (MpegVideoParse * mpegvideoparse)
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while (mpegvideoparse->pending_segs) {
176
GstEvent *ev = mpegvideoparse->pending_segs->data;
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gst_pad_push_event (mpegvideoparse->srcpad, ev);
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mpegvideoparse->pending_segs =
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g_list_delete_link (mpegvideoparse->pending_segs,
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mpegvideoparse->pending_segs);
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mpegvideoparse->pending_segs = NULL;
188
mpv_clear_pending_segs (MpegVideoParse * mpegvideoparse)
190
while (mpegvideoparse->pending_segs) {
191
GstEvent *ev = mpegvideoparse->pending_segs->data;
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gst_event_unref (ev);
194
mpegvideoparse->pending_segs =
195
g_list_delete_link (mpegvideoparse->pending_segs,
196
mpegvideoparse->pending_segs);
201
gst_mpegvideoparse_init (MpegVideoParse * mpegvideoparse)
203
mpegvideoparse->sinkpad =
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gst_pad_new_from_static_template (&sink_template, "sink");
205
gst_pad_set_chain_function (mpegvideoparse->sinkpad,
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gst_mpegvideoparse_chain);
207
gst_pad_set_event_function (mpegvideoparse->sinkpad, mpv_parse_sink_event);
208
gst_element_add_pad (GST_ELEMENT (mpegvideoparse), mpegvideoparse->sinkpad);
210
mpegvideoparse->srcpad =
211
gst_pad_new_from_static_template (&src_template, "src");
212
gst_pad_use_fixed_caps (mpegvideoparse->srcpad);
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gst_element_add_pad (GST_ELEMENT (mpegvideoparse), mpegvideoparse->srcpad);
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mpeg_packetiser_init (&mpegvideoparse->packer);
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mpv_parse_reset (mpegvideoparse);
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gst_mpegvideoparse_dispose (GObject * object)
223
MpegVideoParse *mpegvideoparse = GST_MPEGVIDEOPARSE (object);
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mpeg_packetiser_free (&mpegvideoparse->packer);
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gst_buffer_replace (&mpegvideoparse->seq_hdr_buf, NULL);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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mpegvideoparse_handle_sequence (MpegVideoParse * mpegvideoparse,
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cur = GST_BUFFER_DATA (buf);
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end = GST_BUFFER_DATA (buf) + GST_BUFFER_SIZE (buf);
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memset (&new_hdr, 0, sizeof (MPEGSeqHdr));
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if (G_UNLIKELY (!mpeg_util_parse_sequence_hdr (&new_hdr, cur, end)))
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if (memcmp (&mpegvideoparse->seq_hdr, &new_hdr, sizeof (MPEGSeqHdr)) != 0) {
250
/* Store the entire sequence header + sequence header extension
251
for output as codec_data */
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seq_buf = gst_buffer_copy (buf);
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gst_buffer_replace (&mpegvideoparse->seq_hdr_buf, seq_buf);
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gst_buffer_unref (seq_buf);
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caps = gst_caps_new_simple ("video/mpeg",
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"systemstream", G_TYPE_BOOLEAN, FALSE,
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"parsed", G_TYPE_BOOLEAN, TRUE,
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"mpegversion", G_TYPE_INT, new_hdr.mpeg_version,
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"width", G_TYPE_INT, new_hdr.width,
261
"height", G_TYPE_INT, new_hdr.height,
262
"framerate", GST_TYPE_FRACTION, new_hdr.fps_n, new_hdr.fps_d,
263
"pixel-aspect-ratio", GST_TYPE_FRACTION, new_hdr.par_w, new_hdr.par_h,
264
"codec_data", GST_TYPE_BUFFER, seq_buf, NULL);
266
GST_DEBUG ("New mpegvideoparse caps: %" GST_PTR_FORMAT, caps);
267
if (!gst_pad_set_caps (mpegvideoparse->srcpad, caps)) {
268
gst_caps_unref (caps);
271
gst_caps_unref (caps);
273
/* And update the new_hdr into our stored version */
274
mpegvideoparse->seq_hdr = new_hdr;
281
mpegvideoparse_handle_picture (MpegVideoParse * mpegvideoparse, GstBuffer * buf)
284
guint32 sync_word = 0xffffffff;
286
cur = GST_BUFFER_DATA (buf);
287
end = GST_BUFFER_DATA (buf) + GST_BUFFER_SIZE (buf);
289
cur = mpeg_util_find_start_code (&sync_word, cur, end);
290
while (cur != NULL) {
291
/* Cur points at the last byte of the start code */
292
if (cur[0] == MPEG_PACKET_PICTURE) {
293
guint8 *pic_data = cur - 3;
296
/* pic_data points to the first byte of the sync word now */
297
if (!mpeg_util_parse_picture_hdr (&hdr, pic_data, end))
300
if (hdr.pic_type != MPEG_PICTURE_TYPE_I)
301
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
303
GST_LOG_OBJECT (mpegvideoparse, "Picture type is %u", hdr.pic_type);
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/* FIXME: Can use the picture type and number of fields to track a
307
cur = mpeg_util_find_start_code (&sync_word, cur, end);
315
gst_mpegvideoparse_time_code (guchar * gop, MPEGSeqHdr * seq_hdr)
317
guint32 data = GST_READ_UINT32_BE (gop);
321
seconds = ((data & 0xfc000000) >> 26) * 3600; /* hours */
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seconds += ((data & 0x03f00000) >> 20) * 60; /* minutes */
323
seconds += (data & 0x0007e000) >> 13; /* seconds */
325
frames = (data & 0x00001f80) >> 7;
327
return seconds * GST_SECOND + gst_util_uint64_scale_int (frames * GST_SECOND,
328
seq_hdr->fps_d, seq_hdr->fps_n);
333
gst_mpegvideoparse_flush (MpegVideoParse * mpegvideoparse)
335
GST_DEBUG_OBJECT (mpegvideoparse, "mpegvideoparse: flushing");
337
mpegvideoparse->next_offset = GST_BUFFER_OFFSET_NONE;
339
g_list_foreach (mpegvideoparse->gather, (GFunc) gst_mini_object_unref, NULL);
340
g_list_free (mpegvideoparse->gather);
341
mpegvideoparse->gather = NULL;
342
g_list_foreach (mpegvideoparse->decode, (GFunc) gst_mini_object_unref, NULL);
343
g_list_free (mpegvideoparse->decode);
344
mpegvideoparse->decode = NULL;
345
mpeg_packetiser_flush (&mpegvideoparse->packer);
347
mpv_clear_pending_segs (mpegvideoparse);
351
mpegvideoparse_drain_avail (MpegVideoParse * mpegvideoparse)
354
GstBuffer *buf = NULL;
355
GstFlowReturn res = GST_FLOW_OK;
357
cur = mpeg_packetiser_get_block (&mpegvideoparse->packer, &buf);
358
while ((cur != NULL) && (res == GST_FLOW_OK)) {
359
/* Handle the block */
360
GST_LOG_OBJECT (mpegvideoparse,
361
"Have block of size %u with pack_type 0x%02x and flags 0x%02x",
362
cur->length, cur->first_pack_type, cur->flags);
364
/* Don't start pushing out buffers until we've seen a sequence header */
365
if (mpegvideoparse->seq_hdr.mpeg_version == 0) {
366
if (cur->flags & MPEG_BLOCK_FLAG_SEQUENCE) {
367
/* Found a sequence header */
368
if (!mpegvideoparse_handle_sequence (mpegvideoparse, buf)) {
369
GST_DEBUG_OBJECT (mpegvideoparse,
370
"Invalid sequence header. Dropping buffer.");
371
gst_buffer_unref (buf);
376
GST_DEBUG_OBJECT (mpegvideoparse,
377
"No sequence header yet. Dropping buffer of %u bytes",
378
GST_BUFFER_SIZE (buf));
379
gst_buffer_unref (buf);
386
/* If outputting a PICTURE packet, we can calculate the duration
387
and possibly the timestamp */
388
if (cur->flags & MPEG_BLOCK_FLAG_PICTURE) {
389
if (!mpegvideoparse_handle_picture (mpegvideoparse, buf)) {
390
/* Corrupted picture. Drop it. */
391
GST_DEBUG_OBJECT (mpegvideoparse,
392
"Corrupted picture header. Dropping buffer of %u bytes",
393
GST_BUFFER_SIZE (buf));
394
mpegvideoparse->need_discont = TRUE;
395
gst_buffer_unref (buf);
402
GST_DEBUG_OBJECT (mpegvideoparse,
403
"mpegvideoparse: pushing buffer of %u bytes with ts %"
404
GST_TIME_FORMAT, GST_BUFFER_SIZE (buf),
405
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
407
gst_buffer_set_caps (buf, GST_PAD_CAPS (mpegvideoparse->srcpad));
409
if (mpegvideoparse->need_discont) {
410
GST_DEBUG_OBJECT (mpegvideoparse,
411
"setting discont flag on outgoing buffer");
412
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
413
mpegvideoparse->need_discont = FALSE;
416
mpv_send_pending_segs (mpegvideoparse);
418
res = gst_pad_push (mpegvideoparse->srcpad, buf);
422
/* Advance to the next data block */
423
mpeg_packetiser_next_block (&mpegvideoparse->packer);
424
cur = mpeg_packetiser_get_block (&mpegvideoparse->packer, &buf);
427
gst_buffer_unref (buf);
433
gst_mpegvideoparse_chain_forward (MpegVideoParse * mpegvideoparse,
434
gboolean discont, GstBuffer * buf)
437
guint64 next_offset = GST_BUFFER_OFFSET_NONE;
439
GST_DEBUG_OBJECT (mpegvideoparse,
440
"mpegvideoparse: received buffer of %u bytes with ts %"
441
GST_TIME_FORMAT " and offset %" G_GINT64_FORMAT, GST_BUFFER_SIZE (buf),
442
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), GST_BUFFER_OFFSET (buf));
444
/* If we have an offset, and the incoming offset doesn't match,
445
or we have a discont, handle it first by flushing out data
446
we have collected. */
447
if (mpegvideoparse->next_offset != GST_BUFFER_OFFSET_NONE) {
448
if (GST_BUFFER_OFFSET_IS_VALID (buf)) {
449
if (mpegvideoparse->next_offset != GST_BUFFER_OFFSET (buf))
451
next_offset = GST_BUFFER_OFFSET (buf) + GST_BUFFER_SIZE (buf);
453
next_offset = mpegvideoparse->next_offset + GST_BUFFER_SIZE (buf);
457
/* Clear out any existing stuff if the new buffer is discontinuous */
459
GST_DEBUG_OBJECT (mpegvideoparse, "Have discont packet, draining data");
460
mpegvideoparse->need_discont = TRUE;
462
mpeg_packetiser_handle_eos (&mpegvideoparse->packer);
463
res = mpegvideoparse_drain_avail (mpegvideoparse);
464
mpeg_packetiser_flush (&mpegvideoparse->packer);
465
if (res != GST_FLOW_OK) {
466
gst_buffer_unref (buf);
471
/* Takes ownership of the data */
472
mpeg_packetiser_add_buf (&mpegvideoparse->packer, buf);
474
/* And push out what we can */
475
res = mpegvideoparse_drain_avail (mpegvideoparse);
478
/* Update our offset */
479
mpegvideoparse->next_offset = next_offset;
484
/* scan the decode queue for a picture header with an I frame and return the
485
* index in the first buffer. We only scan the first buffer and possibly a
486
* couple of bytes of the next buffers to find the I frame. Scanning is done
487
* backwards because the first buffer could contain many picture start codes
490
scan_keyframe (MpegVideoParse * mpegvideoparse)
499
/* we use an 8 byte buffer, this is enough to hold the picture start code and
500
* the picture header bits we are interested in. We init to 0xff so that when
501
* we have a valid picture start without the header bits, we will be able to
502
* detect this because it will generate an invalid picture type. */
503
scanword = ~G_GUINT64_CONSTANT (0);
505
GST_LOG_OBJECT (mpegvideoparse, "scan keyframe");
507
/* move to the second buffer if we can, we should have at least one buffer */
508
walk = mpegvideoparse->decode;
509
g_return_val_if_fail (walk != NULL, -1);
511
head = GST_BUFFER_CAST (walk->data);
514
walk = g_list_next (walk);
516
GstBuffer *buf = GST_BUFFER_CAST (walk->data);
518
data = GST_BUFFER_DATA (buf);
519
size = GST_BUFFER_SIZE (buf);
521
GST_LOG_OBJECT (mpegvideoparse, "collect remaining %d bytes from %p",
524
while (size > 0 && count < 6) {
525
scanword = (scanword << 8) | *data++;
532
walk = g_list_next (walk);
534
/* move bits to the beginning of the word now */
536
scanword = (scanword << (8 * (8 - count)));
538
GST_LOG_OBJECT (mpegvideoparse, "scanword 0x%016llx", scanword);
540
data = GST_BUFFER_DATA (head);
541
size = GST_BUFFER_SIZE (head);
544
scanword = (((guint64) data[size - 1]) << 56) | (scanword >> 8);
546
GST_LOG_OBJECT (mpegvideoparse, "scanword at %d 0x%016llx", size - 1,
549
/* check picture start and picture type */
550
if ((scanword & G_GUINT64_CONSTANT (0xffffffff00380000)) ==
551
G_GUINT64_CONSTANT (0x0000010000080000))
559
/* For reverse playback we use a technique that can be used for
560
* any keyframe based video codec.
563
* Buffer decoding order: 7 8 9 4 5 6 1 2 3 EOS
565
* Discont flag: D D D
567
* - Each Discont marks a discont in the decoding order.
568
* - The keyframes mark where we can start decoding. For mpeg they are either
569
* set by the demuxer or we have to scan the buffers for a syncword and
570
* picture header with an I frame.
572
* First we prepend incomming buffers to the gather queue, whenever we receive
573
* a discont, we flush out the gather queue.
575
* The above data will be accumulated in the gather queue like this:
577
* gather queue: 9 8 7
580
* Whe buffer 4 is received (with a DISCONT), we flush the gather queue like
584
* take head of queue and prepend to decode queue.
585
* if we copied a keyframe, decode the decode queue.
587
* After we flushed the gather queue, we add 4 to the (now empty) gather queue.
588
* We get the following situation:
591
* decode queue: 7 8 9
593
* After we received 5 (Keyframe) and 6:
595
* gather queue: 6 5 4
596
* decode queue: 7 8 9
598
* When we receive 1 (DISCONT) which triggers a flush of the gather queue:
600
* Copy head of the gather queue (6) to decode queue:
603
* decode queue: 6 7 8 9
605
* Copy head of the gather queue (5) to decode queue. This is a keyframe so we
606
* can start decoding.
609
* decode queue: 5 6 7 8 9
611
* Decode frames in decode queue, we don't actually do the decoding but we
612
* will send the decode queue to the downstream element. This will empty the
613
* decoding queue again.
615
* Copy head of the gather queue (4) to decode queue, we flushed the gather
616
* queue and can now store input buffer in the gather queue:
621
* When we receive EOS, the queue looks like:
623
* gather queue: 3 2 1
626
* Fill decode queue, first keyframe we copy is 2:
629
* decode queue: 2 3 4
631
* After pushing the decode queue:
636
* Leftover buffer 1 cannot be decoded and must be discarded.
639
gst_mpegvideoparse_flush_decode (MpegVideoParse * mpegvideoparse, guint idx)
641
GstFlowReturn res = GST_FLOW_OK;
642
GstBuffer *head = NULL;
644
while (mpegvideoparse->decode) {
647
buf = GST_BUFFER_CAST (mpegvideoparse->decode->data);
653
/* first buffer, split at the point where the picture start was
654
* detected and store as the new head of the decoding list. */
655
head = gst_buffer_create_sub (buf, 0, idx);
656
/* push the remainder after the picture sync point downstream, this is the
657
* first DISCONT buffer we push. */
658
temp = gst_buffer_create_sub (buf, idx, GST_BUFFER_SIZE (buf) - idx);
659
/* don't need old buffer anymore and swap new buffer */
660
gst_buffer_unref (buf);
663
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
666
/* next buffers are not discont */
667
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
670
GST_DEBUG_OBJECT (mpegvideoparse, "pushing buffer %p, ts %" GST_TIME_FORMAT,
671
buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
673
res = gst_pad_push (mpegvideoparse->srcpad, buf);
675
mpegvideoparse->decode =
676
g_list_delete_link (mpegvideoparse->decode, mpegvideoparse->decode);
679
/* store remainder of the buffer */
680
mpegvideoparse->decode = g_list_prepend (mpegvideoparse->decode, head);
686
gst_mpegvideoparse_chain_reverse (MpegVideoParse * mpegvideoparse,
687
gboolean discont, GstBuffer * buf)
689
GstFlowReturn res = GST_FLOW_OK;
691
/* if we have a discont, move buffers to the decode list */
692
if (G_UNLIKELY (discont)) {
693
GST_DEBUG_OBJECT (mpegvideoparse, "received discont,gathering buffers");
695
while (mpegvideoparse->gather) {
699
gbuf = GST_BUFFER_CAST (mpegvideoparse->gather->data);
700
/* remove from the gather list */
701
mpegvideoparse->gather =
702
g_list_delete_link (mpegvideoparse->gather, mpegvideoparse->gather);
703
/* copy to decode queue */
704
mpegvideoparse->decode = g_list_prepend (mpegvideoparse->decode, gbuf);
706
GST_DEBUG_OBJECT (mpegvideoparse, "copied decoding buffer %p, len %d",
707
gbuf, g_list_length (mpegvideoparse->decode));
709
/* check if we copied a keyframe, we scan the buffers on the decode queue.
710
* We only need to scan the first buffer and at most 3 bytes of the second
711
* buffer. We return the index of the keyframe (or -1 when nothing was
713
while ((keyframeidx = scan_keyframe (mpegvideoparse)) != -1) {
714
GST_DEBUG_OBJECT (mpegvideoparse, "copied keyframe at %u", keyframeidx);
715
res = gst_mpegvideoparse_flush_decode (mpegvideoparse, keyframeidx);
721
/* add buffer to gather queue */
722
GST_DEBUG_OBJECT (mpegvideoparse, "gathering buffer %p, size %u", buf,
723
GST_BUFFER_SIZE (buf));
724
mpegvideoparse->gather = g_list_prepend (mpegvideoparse->gather, buf);
731
gst_mpegvideoparse_chain (GstPad * pad, GstBuffer * buf)
733
MpegVideoParse *mpegvideoparse;
738
GST_MPEGVIDEOPARSE (gst_object_get_parent (GST_OBJECT (pad)));
740
discont = GST_BUFFER_IS_DISCONT (buf);
742
if (mpegvideoparse->segment.rate > 0.0)
743
res = gst_mpegvideoparse_chain_forward (mpegvideoparse, discont, buf);
745
res = gst_mpegvideoparse_chain_reverse (mpegvideoparse, discont, buf);
747
gst_object_unref (mpegvideoparse);
753
mpv_parse_sink_event (GstPad * pad, GstEvent * event)
756
MpegVideoParse *mpegvideoparse =
757
GST_MPEGVIDEOPARSE (gst_pad_get_parent (pad));
759
switch (GST_EVENT_TYPE (event)) {
760
case GST_EVENT_NEWSEGMENT:
762
gdouble rate, applied_rate;
764
gint64 start, stop, pos;
767
gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
768
&format, &start, &stop, &pos);
770
if (format == GST_FORMAT_BYTES) {
771
/* FIXME: Later, we might use a seek table to seek on elementary stream
772
files, and that would allow byte-to-time conversions. It's not a high
773
priority - most mpeg video is muxed and then the demuxer handles
774
seeking. In the meantime, here's some commented out logic copied
777
GstClockTime seg_start, seg_stop, seg_pos;
779
/* stop time is allowed to be open-ended, but not start & pos */
780
if (!mp3parse_bytepos_to_time (mp3parse, stop, &seg_stop))
781
seg_stop = GST_CLOCK_TIME_NONE;
782
if (mp3parse_bytepos_to_time (mp3parse, start, &seg_start) &&
783
mp3parse_bytepos_to_time (mp3parse, pos, &seg_pos)) {
784
gst_event_unref (event);
785
event = gst_event_new_new_segment_full (update, rate, applied_rate,
786
GST_FORMAT_TIME, seg_start, seg_stop, seg_pos);
787
format = GST_FORMAT_TIME;
788
GST_DEBUG_OBJECT (mp3parse, "Converted incoming segment to TIME. "
789
"start = %" G_GINT64_FORMAT ", stop = %" G_GINT64_FORMAT
790
"pos = %" G_GINT64_FORMAT, seg_start, seg_stop, seg_pos);
795
if (format != GST_FORMAT_TIME) {
796
/* Unknown incoming segment format. Output a default open-ended
798
gst_event_unref (event);
801
format = GST_FORMAT_TIME;
803
stop = GST_CLOCK_TIME_NONE;
805
/* create a new segment with these values */
806
event = gst_event_new_new_segment_full (update, rate, applied_rate,
807
format, start, stop, pos);
810
/* now configure the values */
811
gst_segment_set_newsegment_full (&mpegvideoparse->segment, update,
812
rate, applied_rate, format, start, stop, pos);
814
GST_DEBUG_OBJECT (mpegvideoparse,
815
"Pushing newseg rate %g, applied rate %g, format %d, start %"
816
G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT ", pos %" G_GINT64_FORMAT,
817
rate, applied_rate, format, start, stop, pos);
819
/* Forward the event if we've seen a sequence header
820
* and therefore set output caps, otherwise queue it for later */
821
if (mpegvideoparse->seq_hdr.mpeg_version != 0)
822
res = gst_pad_push_event (mpegvideoparse->srcpad, event);
825
mpegvideoparse->pending_segs =
826
g_list_append (mpegvideoparse->pending_segs, event);
830
case GST_EVENT_FLUSH_STOP:
831
GST_DEBUG_OBJECT (mpegvideoparse, "flush stop");
832
gst_mpegvideoparse_flush (mpegvideoparse);
833
res = gst_pad_push_event (mpegvideoparse->srcpad, event);
836
/* Push any remaining buffers out, then flush. */
837
GST_DEBUG_OBJECT (mpegvideoparse, "received EOS");
838
if (mpegvideoparse->segment.rate >= 0.0) {
839
mpeg_packetiser_handle_eos (&mpegvideoparse->packer);
840
mpegvideoparse_drain_avail (mpegvideoparse);
841
gst_mpegvideoparse_flush (mpegvideoparse);
843
gst_mpegvideoparse_chain_reverse (mpegvideoparse, TRUE, NULL);
844
gst_mpegvideoparse_flush_decode (mpegvideoparse, 0);
846
res = gst_pad_push_event (mpegvideoparse->srcpad, event);
849
res = gst_pad_push_event (mpegvideoparse->srcpad, event);
853
gst_object_unref (mpegvideoparse);
857
static GstStateChangeReturn
858
gst_mpegvideoparse_change_state (GstElement * element,
859
GstStateChange transition)
861
MpegVideoParse *mpegvideoparse;
862
GstStateChangeReturn ret;
864
g_return_val_if_fail (GST_IS_MPEGVIDEOPARSE (element),
865
GST_STATE_CHANGE_FAILURE);
867
mpegvideoparse = GST_MPEGVIDEOPARSE (element);
869
switch (transition) {
870
case GST_STATE_CHANGE_READY_TO_PAUSED:
871
gst_segment_init (&mpegvideoparse->segment, GST_FORMAT_UNDEFINED);
877
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
879
switch (transition) {
880
case GST_STATE_CHANGE_PAUSED_TO_READY:
881
mpv_parse_reset (mpegvideoparse);
882
gst_mpegvideoparse_flush (mpegvideoparse);
892
plugin_init (GstPlugin * plugin)
894
GST_DEBUG_CATEGORY_INIT (mpv_parse_debug, "mpegvideoparse", 0,
895
"MPEG Video Parser");
897
return gst_element_register (plugin, "mpegvideoparse",
898
GST_RANK_SECONDARY - 1, GST_TYPE_MPEGVIDEOPARSE);
901
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
904
"MPEG-1 and MPEG-2 video parser",
905
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
added
removed
gst/mpegvideoparse/mpegvideoparse.c
