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gstreamer/ext/dv/gstdvdemux.c
Wim Taymans e6d71f7bea docs/plugins/: Added dvdec and dvdemux to docs. 
Original commit message from CVS:
* docs/plugins/Makefile.am:
* docs/plugins/gst-plugins-good-plugins-docs.sgml:
* docs/plugins/gst-plugins-good-plugins-sections.txt:
Added dvdec and dvdemux to docs.

* ext/dv/gstdvdec.c: (gst_dvdec_base_init), (gst_dvdec_chain):
Added docs.
Check frame sizes so we don't crash when don't have enough
data.
Send nice error messages on error.

* ext/dv/gstdvdemux.c: (gst_dvdemux_base_init),
(gst_dvdemux_class_init), (gst_dvdemux_init),
(gst_dvdemux_finalize), (gst_dvdemux_reset),
(gst_dvdemux_src_convert), (gst_dvdemux_sink_convert),
(gst_dvdemux_src_query), (gst_dvdemux_sink_query),
(gst_dvdemux_push_event), (gst_dvdemux_handle_sink_event),
(gst_dvdemux_convert_src_pair), (gst_dvdemux_convert_sink_pair),
(gst_dvdemux_convert_src_to_sink), (gst_dvdemux_handle_push_seek),
(gst_dvdemux_do_seek), (gst_dvdemux_handle_pull_seek),
(gst_dvdemux_handle_src_event), (gst_dvdemux_demux_audio),
(gst_dvdemux_demux_video), (gst_dvdemux_demux_frame),
(gst_dvdemux_flush), (gst_dvdemux_chain), (gst_dvdemux_loop),
(gst_dvdemux_sink_activate_push), (gst_dvdemux_sink_activate_pull),
(gst_dvdemux_sink_activate), (gst_dvdemux_change_state):
* ext/dv/gstdvdemux.h:
Added docs.
Implement pull mode.
Fix memleaks.
Reduce memcpy for the video demuxing.
2006-02-28 10:22:11 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* <2005> Wim Taymans <wim@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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/audio/audio.h>
#include "gstdvdemux.h"
/**
* SECTION:element-dvdemux
*
* <refsect2>
* <para>
* dvdemux splits raw DV into its audio and video components. The audio will be
* decoded raw samples and the video will be encoded DV video.
* </para>
* <para>
* This element can operate in both push and pull mode depending on the capabilities
* of the upstream peer.
* </para>
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch filesrc location=test.dv ! dvdemux name=demux ! queue ! audioconvert ! alsasink demux. ! queue ! dvdec ! xvimagesink
* </programlisting>
* This pipeline decodes and renders the raw DV stream to an audio and a videosink.
* </para>
* Last reviewed on 2006-02-27 (0.10.3)
* </refsect2>
*/
/* DV output has two modes, normal and wide. The resolution is the same in both
* cases: 720 pixels wide by 576 pixels tall in PAL format, and 720x480 for
* NTSC.
*
* Each of the modes has its own pixel aspect ratio, which is fixed in practice
* by ITU-R BT.601 (also known as "CCIR-601" or "Rec.601"). Or so claims a
* reference that I culled from the reliable "internet",
* http://www.mir.com/DMG/aspect.html. Normal PAL is 59/54 and normal NTSC is
* 10/11. Because the pixel resolution is the same for both cases, we can get
* the pixel aspect ratio for wide recordings by multiplying by the ratio of
* display aspect ratios, 16/9 (for wide) divided by 4/3 (for normal):
*
* Wide NTSC: 10/11 * (16/9)/(4/3) = 40/33
* Wide PAL: 59/54 * (16/9)/(4/3) = 118/81
*
* However, the pixel resolution coming out of a DV source does not combine with
* the standard pixel aspect ratios to give a proper display aspect ratio. An
* image 480 pixels tall, with a 4:3 display aspect ratio, will be 768 pixels
* wide. But, if we take the normal PAL aspect ratio of 59/54, and multiply it
* with the width of the DV image (720 pixels), we get 786.666..., which is
* nonintegral and too wide. The camera is not outputting a 4:3 image.
*
* If the video sink for this stream has fixed dimensions (such as for
* fullscreen playback, or for a java applet in a web page), you then have two
* choices. Either you show the whole image, but pad the image with black
* borders on the top and bottom (like watching a widescreen video on a 4:3
* device), or you crop the video to the proper ratio. Apparently the latter is
* the standard practice.
*
* For its part, GStreamer is concerned with accuracy and preservation of
* information. This element outputs the 720x576 or 720x480 video that it
* recieves, noting the proper aspect ratio. This should not be a problem for
* windowed applications, which can change size to fit the video. Applications
* with fixed size requirements should decide whether to crop or pad which
* an element such as videobox can do.
*/
#define NTSC_HEIGHT 480
#define NTSC_BUFFER 120000
#define NTSC_FRAMERATE_NUMERATOR 30000
#define NTSC_FRAMERATE_DENOMINATOR 1001
#define PAL_HEIGHT 576
#define PAL_BUFFER 144000
#define PAL_FRAMERATE_NUMERATOR 25
#define PAL_FRAMERATE_DENOMINATOR 1
#define PAL_NORMAL_PAR_X 59
#define PAL_NORMAL_PAR_Y 54
#define PAL_WIDE_PAR_X 118
#define PAL_WIDE_PAR_Y 81
#define NTSC_NORMAL_PAR_X 10
#define NTSC_NORMAL_PAR_Y 11
#define NTSC_WIDE_PAR_X 40
#define NTSC_WIDE_PAR_Y 33
GST_DEBUG_CATEGORY (dvdemux_debug);
#define GST_CAT_DEFAULT dvdemux_debug
static GstElementDetails dvdemux_details =
GST_ELEMENT_DETAILS ("DV system stream demuxer",
"Codec/Demuxer",
"Uses libdv to separate DV audio from DV video (libdv.sourceforge.net)",
"Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
static GstStaticPadTemplate sink_temp = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) true")
);
static GstStaticPadTemplate video_src_temp = GST_STATIC_PAD_TEMPLATE ("video",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) false")
);
static GstStaticPadTemplate audio_src_temp = GST_STATIC_PAD_TEMPLATE ("audio",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("audio/x-raw-int, "
"depth = (int) 16, "
"width = (int) 16, "
"signed = (boolean) TRUE, "
"channels = (int) {2, 4}, "
"endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
"rate = (int) { 32000, 44100, 48000 }")
);
GST_BOILERPLATE (GstDVDemux, gst_dvdemux, GstElement, GST_TYPE_ELEMENT);
static void gst_dvdemux_finalize (GObject * object);
/* query functions */
static const GstQueryType *gst_dvdemux_get_src_query_types (GstPad * pad);
static gboolean gst_dvdemux_src_query (GstPad * pad, GstQuery * query);
static const GstQueryType *gst_dvdemux_get_sink_query_types (GstPad * pad);
static gboolean gst_dvdemux_sink_query (GstPad * pad, GstQuery * query);
/* convert functions */
static gboolean gst_dvdemux_sink_convert (GstDVDemux * demux,
GstFormat src_format, gint64 src_value, GstFormat * dest_format,
gint64 * dest_value);
static gboolean gst_dvdemux_src_convert (GstDVDemux * demux, GstPad * pad,
GstFormat src_format, gint64 src_value, GstFormat * dest_format,
gint64 * dest_value);
/* event functions */
static gboolean gst_dvdemux_handle_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_dvdemux_handle_sink_event (GstPad * pad, GstEvent * event);
/* scheduling functions */
static void gst_dvdemux_loop (GstPad * pad);
static GstFlowReturn gst_dvdemux_flush (GstDVDemux * dvdemux);
static GstFlowReturn gst_dvdemux_chain (GstPad * pad, GstBuffer * buffer);
/* state change functions */
static gboolean gst_dvdemux_sink_activate (GstPad * sinkpad);
static gboolean gst_dvdemux_sink_activate_push (GstPad * sinkpad,
gboolean active);
static gboolean gst_dvdemux_sink_activate_pull (GstPad * sinkpad,
gboolean active);
static GstStateChangeReturn gst_dvdemux_change_state (GstElement * element,
GstStateChange transition);
static void
gst_dvdemux_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 (&sink_temp));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&video_src_temp));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&audio_src_temp));
gst_element_class_set_details (element_class, &dvdemux_details);
GST_DEBUG_CATEGORY_INIT (dvdemux_debug, "dvdemux", 0, "DV demuxer element");
}
static void
gst_dvdemux_class_init (GstDVDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_dvdemux_finalize);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_dvdemux_change_state);
/* table initialization, only do once */
dv_init (0, 0);
}
static void
gst_dvdemux_init (GstDVDemux * dvdemux, GstDVDemuxClass * g_class)
{
gint i;
dvdemux->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get (&sink_temp),
"sink");
/* we can operate in pull and push mode so we install
* a custom activate function */
gst_pad_set_activate_function (dvdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate));
/* the function to activate in push mode */
gst_pad_set_activatepush_function (dvdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate_push));
/* the function to activate in pull mode */
gst_pad_set_activatepull_function (dvdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate_pull));
/* for push mode, this is the chain function */
gst_pad_set_chain_function (dvdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_chain));
/* handling events (in push mode only) */
gst_pad_set_event_function (dvdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_handle_sink_event));
/* query functions */
gst_pad_set_query_function (dvdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_sink_query));
gst_pad_set_query_type_function (dvdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_get_sink_query_types));
/* now add the pad */
gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->sinkpad);
dvdemux->adapter = gst_adapter_new ();
/* we need 4 temp buffers for audio decoding which are of a static
* size and which we can allocate here */
for (i = 0; i < 4; i++) {
dvdemux->audio_buffers[i] =
(gint16 *) g_malloc (DV_AUDIO_MAX_SAMPLES * sizeof (gint16));
}
}
static void
gst_dvdemux_finalize (GObject * object)
{
GstDVDemux *dvdemux;
gint i;
dvdemux = GST_DVDEMUX (object);
g_object_unref (dvdemux->adapter);
/* clean up temp audio buffers */
for (i = 0; i < 4; i++) {
g_free (dvdemux->audio_buffers[i]);
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* reset to default values before starting streaming */
static void
gst_dvdemux_reset (GstDVDemux * dvdemux)
{
dvdemux->frame_offset = 0;
dvdemux->audio_offset = 0;
dvdemux->video_offset = 0;
dvdemux->framecount = 0;
dvdemux->found_header = FALSE;
dvdemux->frame_len = -1;
dvdemux->need_segment = FALSE;
dvdemux->new_media = FALSE;
dvdemux->framerate_numerator = 0;
dvdemux->framerate_denominator = 0;
dvdemux->height = 0;
dvdemux->frequency = 0;
dvdemux->channels = 0;
dvdemux->wide = FALSE;
gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES);
gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME);
}
static void
gst_dvdemux_add_pads (GstDVDemux * dvdemux)
{
dvdemux->videosrcpad =
gst_pad_new_from_template (gst_static_pad_template_get (&video_src_temp),
"video");
gst_pad_set_query_function (dvdemux->videosrcpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_src_query));
gst_pad_set_query_type_function (dvdemux->videosrcpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_get_src_query_types));
gst_pad_set_event_function (dvdemux->videosrcpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_handle_src_event));
gst_pad_use_fixed_caps (dvdemux->videosrcpad);
gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->videosrcpad);
dvdemux->audiosrcpad =
gst_pad_new_from_template (gst_static_pad_template_get (&audio_src_temp),
"audio");
gst_pad_set_query_function (dvdemux->audiosrcpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_src_query));
gst_pad_set_query_type_function (dvdemux->audiosrcpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_get_src_query_types));
gst_pad_set_event_function (dvdemux->audiosrcpad,
GST_DEBUG_FUNCPTR (gst_dvdemux_handle_src_event));
gst_pad_use_fixed_caps (dvdemux->audiosrcpad);
gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->audiosrcpad);
gst_element_no_more_pads (GST_ELEMENT (dvdemux));
}
static gboolean
gst_dvdemux_src_convert (GstDVDemux * dvdemux, GstPad * pad,
GstFormat src_format, gint64 src_value, GstFormat * dest_format,
gint64 * dest_value)
{
gboolean res = TRUE;
if (*dest_format == src_format || src_value == -1) {
*dest_value = src_value;
goto done;
}
if (dvdemux->frame_len == -1)
goto error;
if (dvdemux->decoder == NULL)
goto error;
GST_INFO_OBJECT (pad, "src_value:%lld, src_format:%d, dest_format:%d",
src_value, src_format, *dest_format);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
if (pad == dvdemux->videosrcpad)
*dest_value = src_value / dvdemux->frame_len;
else if (pad == dvdemux->audiosrcpad)
*dest_value = src_value / (2 * dvdemux->channels);
break;
case GST_FORMAT_TIME:
*dest_format = GST_FORMAT_TIME;
if (pad == dvdemux->videosrcpad)
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * dvdemux->framerate_denominator,
dvdemux->frame_len * dvdemux->framerate_numerator);
else if (pad == dvdemux->audiosrcpad)
*dest_value = gst_util_uint64_scale_int (src_value, GST_SECOND,
2 * dvdemux->frequency * dvdemux->channels);
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
if (pad == dvdemux->videosrcpad)
*dest_value = gst_util_uint64_scale (src_value,
dvdemux->frame_len * dvdemux->framerate_numerator,
dvdemux->framerate_denominator * GST_SECOND);
else if (pad == dvdemux->audiosrcpad)
*dest_value = gst_util_uint64_scale_int (src_value,
2 * dvdemux->frequency * dvdemux->channels, GST_SECOND);
break;
case GST_FORMAT_DEFAULT:
if (pad == dvdemux->videosrcpad) {
if (src_value)
*dest_value = gst_util_uint64_scale (src_value,
dvdemux->framerate_numerator,
dvdemux->framerate_denominator * GST_SECOND);
else
*dest_value = 0;
} else if (pad == dvdemux->audiosrcpad) {
*dest_value = gst_util_uint64_scale (src_value,
dvdemux->frequency, GST_SECOND);
}
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
if (pad == dvdemux->videosrcpad) {
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * dvdemux->framerate_denominator,
dvdemux->framerate_numerator);
} else if (pad == dvdemux->audiosrcpad) {
if (src_value)
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND, dvdemux->frequency);
else
*dest_value = 0;
}
break;
case GST_FORMAT_BYTES:
if (pad == dvdemux->videosrcpad) {
*dest_value = src_value * dvdemux->frame_len;
} else if (pad == dvdemux->audiosrcpad) {
*dest_value = src_value * 2 * dvdemux->channels;
}
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
done:
GST_INFO_OBJECT (pad, "Result : dest_format:%d, dest_value:%lld, res:%d",
*dest_format, *dest_value, res);
return res;
/* ERRORS */
error:
{
GST_INFO ("source conversion failed");
return FALSE;
}
}
static gboolean
gst_dvdemux_sink_convert (GstDVDemux * dvdemux, GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GST_DEBUG_OBJECT (dvdemux, "%d -> %d", src_format, *dest_format);
GST_INFO_OBJECT (dvdemux, "src_value:%lld, src_format:%d, dest_format:%d",
src_value, src_format, *dest_format);
if (*dest_format == GST_FORMAT_DEFAULT)
*dest_format = GST_FORMAT_TIME;
if (*dest_format == src_format || src_value == -1) {
*dest_value = src_value;
goto done;
}
if (dvdemux->frame_len <= 0)
goto error;
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
{
guint64 frame;
/* get frame number, rounds down so don't combine this
* line and the next line. */
frame = src_value / dvdemux->frame_len;
*dest_value = gst_util_uint64_scale (frame,
GST_SECOND * dvdemux->framerate_denominator,
dvdemux->framerate_numerator);
break;
}
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
{
guint64 frame;
/* calculate the frame */
frame =
gst_util_uint64_scale (src_value, dvdemux->framerate_numerator,
dvdemux->framerate_denominator * GST_SECOND);
/* calculate the offset from the rounded frame */
*dest_value = frame * dvdemux->frame_len;
break;
}
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
GST_INFO_OBJECT (dvdemux, "Result : dest_format:%d, dest_value:%lld, res:%d",
*dest_format, *dest_value, res);
done:
return res;
error:
{
GST_INFO_OBJECT (dvdemux, "sink conversion failed");
return FALSE;
}
}
static const GstQueryType *
gst_dvdemux_get_src_query_types (GstPad * pad)
{
static const GstQueryType src_query_types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
GST_QUERY_CONVERT,
0
};
return src_query_types;
}
static gboolean
gst_dvdemux_src_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstDVDemux *dvdemux;
dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gint64 cur;
/* get target format */
gst_query_parse_position (query, &format, NULL);
/* bring the position to the requested format. */
if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
GST_FORMAT_TIME, dvdemux->time_segment.last_stop,
&format, &cur)))
goto error;
gst_query_set_position (query, format, cur);
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
GstFormat format2;
gint64 end;
GstPad *peer;
/* get target format */
gst_query_parse_duration (query, &format, NULL);
/* change query to bytes to perform on peer */
gst_query_set_duration (query, GST_FORMAT_BYTES, -1);
if ((peer = gst_pad_get_peer (dvdemux->sinkpad))) {
/* ask peer for total length */
if (!(res = gst_pad_query (peer, query))) {
gst_object_unref (peer);
goto error;
}
/* get peer total length */
gst_query_parse_duration (query, NULL, &end);
gst_object_unref (peer);
/* convert end to requested format */
if (end != -1) {
format2 = format;
if (!(res = gst_dvdemux_sink_convert (dvdemux,
GST_FORMAT_BYTES, end, &format2, &end))) {
goto error;
}
}
} else {
end = -1;
}
gst_query_set_duration (query, format, end);
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 =
gst_dvdemux_src_convert (dvdemux, 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;
}
gst_object_unref (dvdemux);
return res;
/* ERRORS */
error:
{
gst_object_unref (dvdemux);
GST_DEBUG ("error source query");
return FALSE;
}
}
static const GstQueryType *
gst_dvdemux_get_sink_query_types (GstPad * pad)
{
static const GstQueryType sink_query_types[] = {
GST_QUERY_CONVERT,
0
};
return sink_query_types;
}
static gboolean
gst_dvdemux_sink_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstDVDemux *dvdemux;
dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
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 =
gst_dvdemux_sink_convert (dvdemux, 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;
}
gst_object_unref (dvdemux);
return res;
/* ERRORS */
error:
{
gst_object_unref (dvdemux);
GST_DEBUG ("error handling sink query");
return FALSE;
}
}
/* takes ownership of the event */
static gboolean
gst_dvdemux_push_event (GstDVDemux * dvdemux, GstEvent * event)
{
gboolean res = FALSE;
if (dvdemux->videosrcpad) {
gst_event_ref (event);
res |= gst_pad_push_event (dvdemux->videosrcpad, event);
}
if (dvdemux->audiosrcpad)
res |= gst_pad_push_event (dvdemux->audiosrcpad, event);
else
gst_event_unref (event);
return res;
}
static gboolean
gst_dvdemux_handle_sink_event (GstPad * pad, GstEvent * event)
{
GstDVDemux *dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
gboolean res = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* we are not blocking on anything exect the push() calls
* to the peer which will be unblocked by forwarding the
* event.*/
res = gst_dvdemux_push_event (dvdemux, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (dvdemux->adapter);
GST_DEBUG ("cleared adapter");
gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES);
gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME);
res = gst_dvdemux_push_event (dvdemux, event);
break;
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
gdouble rate;
GstFormat format;
gint64 start, stop, time;
/* parse byte start and stop positions */
gst_event_parse_new_segment (event, &update, &rate, &format,
&start, &stop, &time);
switch (format) {
case GST_FORMAT_BYTES:
gst_segment_set_newsegment (&dvdemux->byte_segment, update,
rate, format, start, stop, time);
/* and queue a SEGMENT before sending the next set of buffers, we
* cannot convert to time yet as we might not know the size of the
* frames, etc.. */
dvdemux->need_segment = TRUE;
gst_event_unref (event);
break;
case GST_FORMAT_TIME:
gst_segment_set_newsegment (&dvdemux->time_segment, update,
rate, format, start, stop, time);
/* and we can just forward this time event */
res = gst_dvdemux_push_event (dvdemux, event);
break;
default:
gst_event_unref (event);
/* cannot accept this format */
res = FALSE;
break;
}
break;
}
case GST_EVENT_EOS:
/* flush any pending data, should be nothing left. */
gst_dvdemux_flush (dvdemux);
/* forward event */
res = gst_dvdemux_push_event (dvdemux, event);
/* and clear the adapter */
gst_adapter_clear (dvdemux->adapter);
break;
default:
res = gst_dvdemux_push_event (dvdemux, event);
break;
}
gst_object_unref (dvdemux);
return res;
}
/* convert a pair of values on the given srcpad */
static gboolean
gst_dvdemux_convert_src_pair (GstDVDemux * dvdemux, GstPad * pad,
GstFormat src_format, gint64 src_start, gint64 src_stop,
GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
{
gboolean res;
GST_INFO ("starting conversion of start");
/* bring the format to time on srcpad. */
if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
src_format, src_start, &dst_format, dst_start))) {
goto done;
}
GST_INFO ("Finished conversion of start: %lld", *dst_start);
GST_INFO ("starting conversion of stop");
/* bring the format to time on srcpad. */
if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
src_format, src_stop, &dst_format, dst_stop))) {
/* could not convert seek format to time offset */
goto done;
}
GST_INFO ("Finished conversion of stop: %lld", *dst_stop);
done:
return res;
}
/* convert a pair of values on the sinkpad */
static gboolean
gst_dvdemux_convert_sink_pair (GstDVDemux * dvdemux,
GstFormat src_format, gint64 src_start, gint64 src_stop,
GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
{
gboolean res;
GST_INFO ("starting conversion of start");
/* bring the format to time on srcpad. */
if (!(res = gst_dvdemux_sink_convert (dvdemux,
src_format, src_start, &dst_format, dst_start))) {
goto done;
}
GST_INFO ("Finished conversion of start: %lld", *dst_start);
GST_INFO ("starting conversion of stop");
/* bring the format to time on srcpad. */
if (!(res = gst_dvdemux_sink_convert (dvdemux,
src_format, src_stop, &dst_format, dst_stop))) {
/* could not convert seek format to time offset */
goto done;
}
GST_INFO ("Finished conversion of stop: %lld", *dst_stop);
done:
return res;
}
/* convert a pair of values on the srcpad to a pair of
* values on the sinkpad
*/
static gboolean
gst_dvdemux_convert_src_to_sink (GstDVDemux * dvdemux, GstPad * pad,
GstFormat src_format, gint64 src_start, gint64 src_stop,
GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
{
GstFormat conv;
gboolean res;
conv = GST_FORMAT_TIME;
/* convert to TIME intermediate format */
if (!(res = gst_dvdemux_convert_src_pair (dvdemux, pad,
src_format, src_start, src_stop, conv, dst_start, dst_stop))) {
/* could not convert format to time offset */
goto done;
}
/* convert to dst format on sinkpad */
if (!(res = gst_dvdemux_convert_sink_pair (dvdemux,
conv, *dst_start, *dst_stop, dst_format, dst_start, dst_stop))) {
/* could not convert format to time offset */
goto done;
}
done:
return res;
}
/* handle seek in push base mode.
*
* Convert the time seek to a bytes seek and send it
* upstream
*
* FIXME, upstream might be able to perform time based
* seek too.
*/
static gboolean
gst_dvdemux_handle_push_seek (GstDVDemux * dvdemux, GstPad * pad,
GstEvent * event)
{
gboolean res;
gdouble rate;
GstSeekFlags flags;
GstFormat format;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 start_position, end_position;
GstEvent *newevent;
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
/* we convert the start/stop on the srcpad to the byte format
* on the sinkpad and forward the event */
res = gst_dvdemux_convert_src_to_sink (dvdemux, pad,
format, cur, stop, GST_FORMAT_BYTES, &start_position, &end_position);
if (!res)
goto done;
/* now this is the updated seek event on bytes */
newevent = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
cur_type, start_position, stop_type, end_position);
res = gst_pad_push_event (dvdemux->sinkpad, newevent);
done:
return res;
}
/* position ourselves to the configured segment, used in pull mode.
* The input segment is in TIME format. We convert the time values
* to bytes values into our byte_segment which we use to pull data from
* the sinkpad peer.
*/
static gboolean
gst_dvdemux_do_seek (GstDVDemux * demux, GstSegment * segment)
{
gboolean res;
GstFormat format;
/* position to value configured is last_stop, this will round down
* to the byte position where the frame containing the given
* timestamp can be found. */
format = GST_FORMAT_BYTES;
res = gst_dvdemux_sink_convert (demux,
segment->format, segment->last_stop,
&format, &demux->byte_segment.last_stop);
if (!res)
goto done;
/* update byte segment start */
gst_dvdemux_sink_convert (demux,
segment->format, segment->start, &format, &demux->byte_segment.start);
/* update byte segment stop */
gst_dvdemux_sink_convert (demux,
segment->format, segment->stop, &format, &demux->byte_segment.stop);
/* update byte segment time */
gst_dvdemux_sink_convert (demux,
segment->format, segment->time, &format, &demux->byte_segment.time);
/* calculate current frame number */
format = GST_FORMAT_DEFAULT;
gst_dvdemux_src_convert (demux, demux->videosrcpad,
segment->format, segment->start, &format, &demux->video_offset);
/* calculate current audio number */
format = GST_FORMAT_DEFAULT;
gst_dvdemux_src_convert (demux, demux->audiosrcpad,
segment->format, segment->start, &format, &demux->audio_offset);
/* every DV frame corresponts with one video frame */
demux->frame_offset = demux->video_offset;
done:
return res;
}
/* handle seek in pull base mode.
*/
static gboolean
gst_dvdemux_handle_pull_seek (GstDVDemux * demux, GstPad * pad,
GstEvent * event)
{
gboolean res;
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gboolean flush;
gboolean update;
GstSegment seeksegment;
GST_DEBUG_OBJECT (demux, "doing seek");
/* first bring the event format to TIME, our native format
* to perform the seek on */
if (event) {
GstFormat conv;
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
/* can't seek backwards yet */
if (rate <= 0.0)
goto wrong_rate;
/* convert input format to TIME */
conv = GST_FORMAT_TIME;
if (!(res = gst_dvdemux_convert_src_pair (demux, pad,
format, cur, stop, conv, &cur, &stop)))
goto no_format;
format = GST_FORMAT_TIME;
} else {
flags = 0;
}
flush = flags & GST_SEEK_FLAG_FLUSH;
/* send flush start */
if (flush)
gst_dvdemux_push_event (demux, gst_event_new_flush_start ());
else
gst_pad_pause_task (demux->sinkpad);
/* grab streaming lock, this should eventually be possible, either
* because the task is paused or our streaming thread stopped
* because our peer is flushing. */
GST_PAD_STREAM_LOCK (demux->sinkpad);
/* make copy into temp structure, we can only update the main one
* when the subclass actually could to the seek. */
memcpy (&seeksegment, &demux->time_segment, sizeof (GstSegment));
/* now configure the seek segment */
if (event) {
gst_segment_set_seek (&seeksegment, rate, format, flags,
cur_type, cur, stop_type, stop, &update);
}
GST_DEBUG_OBJECT (demux, "segment configured from %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
seeksegment.start, seeksegment.stop, seeksegment.last_stop);
/* do the seek, segment.last_stop contains new position. */
res = gst_dvdemux_do_seek (demux, &seeksegment);
/* and prepare to continue streaming */
if (flush) {
/* send flush stop, peer will accept data and events again. We
* are not yet providing data as we still have the STREAM_LOCK. */
gst_dvdemux_push_event (demux, gst_event_new_flush_stop ());
} else if (res && demux->running) {
/* we are running the current segment and doing a non-flushing seek,
* close the segment first based on the last_stop. */
GST_DEBUG_OBJECT (demux, "closing running segment %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT, demux->time_segment.start,
demux->time_segment.last_stop);
gst_dvdemux_push_event (demux,
gst_event_new_new_segment (TRUE,
demux->time_segment.rate, demux->time_segment.format,
demux->time_segment.start, demux->time_segment.last_stop,
demux->time_segment.time));
}
/* if successfull seek, we update our real segment and push
* out the new segment. */
if (res) {
memcpy (&demux->time_segment, &seeksegment, sizeof (GstSegment));
if (demux->time_segment.flags & GST_SEEK_FLAG_SEGMENT) {
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_segment_start (GST_OBJECT_CAST (demux),
demux->time_segment.format, demux->time_segment.last_stop));
}
if ((stop = demux->time_segment.stop) == -1)
stop = demux->time_segment.duration;
/* now send the newsegment */
GST_DEBUG_OBJECT (demux, "Sending newsegment from %" GST_TIME_FORMAT
" to %" GST_TIME_FORMAT, GST_TIME_ARGS (demux->time_segment.start),
GST_TIME_ARGS (stop));
gst_dvdemux_push_event (demux,
gst_event_new_new_segment (FALSE,
demux->time_segment.rate, demux->time_segment.format,
demux->time_segment.last_stop, stop, demux->time_segment.time));
}
demux->running = TRUE;
/* and restart the task in case it got paused explicitely or by
* the FLUSH_START event we pushed out. */
gst_pad_start_task (demux->sinkpad, (GstTaskFunction) gst_dvdemux_loop,
demux->sinkpad);
/* and release the lock again so we can continue streaming */
GST_PAD_STREAM_UNLOCK (demux->sinkpad);
return TRUE;
/* ERRORS */
wrong_rate:
{
GST_DEBUG_OBJECT (demux, "negative playback rate %lf not supported.", rate);
return FALSE;
}
no_format:
{
GST_DEBUG_OBJECT (demux, "cannot convert to TIME format, seek aborted.");
return FALSE;
}
}
/* handle an event on the source pad, it's most likely a seek */
static gboolean
gst_dvdemux_handle_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstDVDemux *dvdemux;
dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
/* seek handler is installed based on scheduling mode */
if (dvdemux->seek_handler)
res = dvdemux->seek_handler (dvdemux, pad, event);
else
res = FALSE;
break;
case GST_EVENT_QOS:
/* we can't really (yet) do QoS */
case GST_EVENT_NAVIGATION:
/* no navigation either... */
default:
res = FALSE;
break;
}
gst_event_unref (event);
gst_object_unref (dvdemux);
return res;
}
/* does not take ownership of buffer */
static GstFlowReturn
gst_dvdemux_demux_audio (GstDVDemux * dvdemux, GstBuffer * buffer,
guint64 duration)
{
gint num_samples;
gint frequency, channels;
GstFlowReturn ret;
const guint8 *data;
frequency = dv_get_frequency (dvdemux->decoder);
channels = dv_get_num_channels (dvdemux->decoder);
data = GST_BUFFER_DATA (buffer);
/* check if format changed */
if ((frequency != dvdemux->frequency) || (channels != dvdemux->channels)) {
GstCaps *caps;
dvdemux->frequency = frequency;
dvdemux->channels = channels;
/* and set new caps */
caps = gst_caps_new_simple ("audio/x-raw-int",
"rate", G_TYPE_INT, frequency,
"depth", G_TYPE_INT, 16,
"width", G_TYPE_INT, 16,
"signed", G_TYPE_BOOLEAN, TRUE,
"channels", G_TYPE_INT, channels,
"endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
gst_pad_set_caps (dvdemux->audiosrcpad, caps);
gst_caps_unref (caps);
}
dv_decode_full_audio (dvdemux->decoder, data, dvdemux->audio_buffers);
if ((num_samples = dv_get_num_samples (dvdemux->decoder)) > 0) {
gint16 *a_ptr;
gint i, j;
GstBuffer *outbuf;
outbuf = gst_buffer_new_and_alloc (num_samples *
sizeof (gint16) * dvdemux->channels);
a_ptr = (gint16 *) GST_BUFFER_DATA (outbuf);
for (i = 0; i < num_samples; i++) {
for (j = 0; j < dvdemux->channels; j++) {
*(a_ptr++) = dvdemux->audio_buffers[j][i];
}
}
GST_DEBUG ("pushing audio %" GST_TIME_FORMAT,
GST_TIME_ARGS (dvdemux->time_segment.last_stop));
GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.last_stop;
GST_BUFFER_DURATION (outbuf) = duration;
GST_BUFFER_OFFSET (outbuf) = dvdemux->audio_offset;
dvdemux->audio_offset += num_samples;
GST_BUFFER_OFFSET_END (outbuf) = dvdemux->audio_offset;
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dvdemux->audiosrcpad));
ret = gst_pad_push (dvdemux->audiosrcpad, outbuf);
} else {
/* no samples */
ret = GST_FLOW_OK;
}
return ret;
}
/* takes ownership of buffer */
static GstFlowReturn
gst_dvdemux_demux_video (GstDVDemux * dvdemux, GstBuffer * buffer,
guint64 duration)
{
GstBuffer *outbuf;
gint height;
gboolean wide;
GstFlowReturn ret = GST_FLOW_OK;
/* get params */
/* framerate is already up-to-date */
height = (dvdemux->PAL ? PAL_HEIGHT : NTSC_HEIGHT);
wide = dv_format_wide (dvdemux->decoder);
/* see if anything changed */
if (G_UNLIKELY ((dvdemux->height != height) || dvdemux->wide != wide)) {
GstCaps *caps;
gint par_x, par_y;
dvdemux->height = height;
dvdemux->wide = wide;
if (dvdemux->PAL) {
if (wide) {
par_x = PAL_WIDE_PAR_X;
par_y = PAL_WIDE_PAR_Y;
} else {
par_x = PAL_NORMAL_PAR_X;
par_y = PAL_NORMAL_PAR_Y;
}
} else {
if (wide) {
par_x = NTSC_WIDE_PAR_X;
par_y = NTSC_WIDE_PAR_Y;
} else {
par_x = NTSC_NORMAL_PAR_X;
par_y = NTSC_NORMAL_PAR_Y;
}
}
caps = gst_caps_new_simple ("video/x-dv",
"systemstream", G_TYPE_BOOLEAN, FALSE,
"width", G_TYPE_INT, 720,
"height", G_TYPE_INT, height,
"framerate", GST_TYPE_FRACTION, dvdemux->framerate_numerator,
dvdemux->framerate_denominator,
"pixel-aspect-ratio", GST_TYPE_FRACTION, par_x, par_y, NULL);
gst_pad_set_caps (dvdemux->videosrcpad, caps);
gst_caps_unref (caps);
}
/* takes ownership of buffer here, we just need to modify
* the metadata. */
outbuf = gst_buffer_make_metadata_writable (buffer);
GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.last_stop;
GST_BUFFER_OFFSET (outbuf) = dvdemux->video_offset;
GST_BUFFER_OFFSET_END (outbuf) = dvdemux->video_offset + 1;
GST_BUFFER_DURATION (outbuf) = duration;
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (dvdemux->videosrcpad));
GST_DEBUG ("pushing video %" GST_TIME_FORMAT,
GST_TIME_ARGS (dvdemux->time_segment.last_stop));
ret = gst_pad_push (dvdemux->videosrcpad, outbuf);
dvdemux->video_offset++;
return ret;
}
/* takes ownership of buffer */
static GstFlowReturn
gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
{
GstClockTime next_ts;
GstFlowReturn aret, vret, ret;
guint8 *data;
guint64 duration;
if (G_UNLIKELY (dvdemux->need_segment)) {
GstEvent *event;
GstFormat format;
gboolean res;
/* convert to time and store as start/end_timestamp */
format = GST_FORMAT_TIME;
if (!(res = gst_dvdemux_convert_sink_pair (dvdemux,
GST_FORMAT_BYTES, dvdemux->byte_segment.start,
dvdemux->byte_segment.stop, format,
&dvdemux->time_segment.start, &dvdemux->time_segment.stop)))
goto segment_error;
/* calculate current frame number */
format = GST_FORMAT_DEFAULT;
if (!(res = gst_dvdemux_src_convert (dvdemux, dvdemux->videosrcpad,
GST_FORMAT_TIME, dvdemux->time_segment.start,
&format, &dvdemux->frame_offset)))
goto segment_error;
GST_DEBUG_OBJECT (dvdemux, "sending segment start: %" GST_TIME_FORMAT
", stop: %" GST_TIME_FORMAT ", time: %" GST_TIME_FORMAT,
GST_TIME_ARGS (dvdemux->time_segment.start),
GST_TIME_ARGS (dvdemux->time_segment.stop),
GST_TIME_ARGS (dvdemux->time_segment.start));
event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
dvdemux->time_segment.start, dvdemux->time_segment.stop,
dvdemux->time_segment.start);
gst_dvdemux_push_event (dvdemux, event);
dvdemux->need_segment = FALSE;
}
next_ts = gst_util_uint64_scale_int (
(dvdemux->frame_offset + 1) * GST_SECOND,
dvdemux->framerate_denominator, dvdemux->framerate_numerator);
duration = next_ts - dvdemux->time_segment.last_stop;
data = GST_BUFFER_DATA (buffer);
dv_parse_packs (dvdemux->decoder, data);
if (G_UNLIKELY (dv_is_new_recording (dvdemux->decoder, data)))
dvdemux->new_media = TRUE;
/* does not take ownership of buffer */
aret = ret = gst_dvdemux_demux_audio (dvdemux, buffer, duration);
if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)) {
gst_buffer_unref (buffer);
goto done;
}
/* takes ownership of buffer */
vret = ret = gst_dvdemux_demux_video (dvdemux, buffer, duration);
if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED))
goto done;
/* if both are not linked, we stop */
if (G_UNLIKELY (aret == GST_FLOW_NOT_LINKED && vret == GST_FLOW_NOT_LINKED)) {
ret = GST_FLOW_NOT_LINKED;
goto done;
}
ret = GST_FLOW_OK;
dvdemux->time_segment.last_stop = next_ts;
dvdemux->frame_offset++;
done:
return ret;
/* ERRORS */
segment_error:
{
GST_DEBUG ("error generating new_segment event");
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
}
}
/* flush any remaining data in the adapter */
static GstFlowReturn
gst_dvdemux_flush (GstDVDemux * dvdemux)
{
GstFlowReturn ret = GST_FLOW_OK;
while (gst_adapter_available (dvdemux->adapter) >= dvdemux->frame_len) {
const guint8 *data;
gint length;
/* get the accumulated bytes */
data = gst_adapter_peek (dvdemux->adapter, dvdemux->frame_len);
/* parse header to know the length and other params */
if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, data) < 0))
goto parse_header_error;
dvdemux->found_header = TRUE;
/* after parsing the header we know the length of the data */
dvdemux->PAL = dv_system_50_fields (dvdemux->decoder);
length = dvdemux->frame_len = (dvdemux->PAL ? PAL_BUFFER : NTSC_BUFFER);
if (dvdemux->PAL) {
dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR;
dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR;
} else {
dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR;
dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR;
}
/* let demux_video set the height, it needs to detect when things change so
* it can reset caps */
/* if we still have enough for a frame, start decoding */
if (G_LIKELY (gst_adapter_available (dvdemux->adapter) >= length)) {
GstBuffer *buffer;
data = gst_adapter_take (dvdemux->adapter, length);
/* create buffer for the remainder of the code */
buffer = gst_buffer_new ();
GST_BUFFER_DATA (buffer) = (guint8 *) data;
GST_BUFFER_SIZE (buffer) = length;
GST_BUFFER_MALLOCDATA (buffer) = (guint8 *) data;
/* and decode the buffer, takes ownership */
ret = gst_dvdemux_demux_frame (dvdemux, buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto done;
}
}
done:
return ret;
/* ERRORS */
parse_header_error:
{
GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
(NULL), ("Error parsing DV header"));
return GST_FLOW_ERROR;
}
}
/* streaming operation:
*
* accumulate data until we have a frame, then decode.
*/
static GstFlowReturn
gst_dvdemux_chain (GstPad * pad, GstBuffer * buffer)
{
GstDVDemux *dvdemux;
GstFlowReturn ret;
dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
/* a discontinuity in the stream, we need to get rid of
* accumulated data in the adapter and assume a new frame
* starts after the discontinuity */
if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)))
gst_adapter_clear (dvdemux->adapter);
/* temporary hack? Can't do this from the state change */
if (G_UNLIKELY (!dvdemux->videosrcpad))
gst_dvdemux_add_pads (dvdemux);
gst_adapter_push (dvdemux->adapter, buffer);
/* Apparently dv_parse_header can read from the body of the frame
* too, so it needs more than header_size bytes. Wacky!
*/
if (G_UNLIKELY (dvdemux->frame_len == -1)) {
/* if we don't know the length of a frame, we assume it is
* the NTSC_BUFFER length, as this is enough to figure out
* if this is PAL or NTSC */
dvdemux->frame_len = NTSC_BUFFER;
}
/* and try to flush pending frames */
ret = gst_dvdemux_flush (dvdemux);
gst_object_unref (dvdemux);
return ret;
}
/* pull based operation.
*
* Read header first to figure out the frame size. Then read
* and decode full frames.
*/
static void
gst_dvdemux_loop (GstPad * pad)
{
GstFlowReturn ret;
GstDVDemux *dvdemux;
GstBuffer *buffer = NULL;
const guint8 *data;
dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
if (G_UNLIKELY (!dvdemux->found_header)) {
/* add pads.. why is this again? */
if (!dvdemux->videosrcpad)
gst_dvdemux_add_pads (dvdemux);
GST_DEBUG_OBJECT (dvdemux, "pulling first buffer");
/* pull in NTSC sized buffer to figure out the frame
* length */
ret = gst_pad_pull_range (dvdemux->sinkpad,
dvdemux->byte_segment.last_stop, NTSC_BUFFER, &buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pause;
/* check buffer size, don't want to read small buffers */
if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < NTSC_BUFFER))
goto pause;
data = GST_BUFFER_DATA (buffer);
/* parse header to know the length and other params */
if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, data) < 0))
goto parse_header_error;
/* got header now */
dvdemux->found_header = TRUE;
/* after parsing the header we know the length of the data */
dvdemux->PAL = dv_system_50_fields (dvdemux->decoder);
dvdemux->frame_len = (dvdemux->PAL ? PAL_BUFFER : NTSC_BUFFER);
if (dvdemux->PAL) {
dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR;
dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR;
} else {
dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR;
dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR;
}
dvdemux->need_segment = TRUE;
/* see if we need to read a larger part */
if (dvdemux->frame_len != NTSC_BUFFER) {
gst_buffer_unref (buffer);
buffer = NULL;
}
}
if (G_LIKELY (buffer == NULL)) {
GST_DEBUG_OBJECT (dvdemux, "pulling buffer at offset %" G_GINT64_FORMAT,
dvdemux->byte_segment.last_stop);
ret = gst_pad_pull_range (dvdemux->sinkpad,
dvdemux->byte_segment.last_stop, dvdemux->frame_len, &buffer);
if (ret == GST_FLOW_UNEXPECTED)
goto eos;
if (ret != GST_FLOW_OK)
goto pause;
/* check buffer size, don't want to read small buffers */
if (GST_BUFFER_SIZE (buffer) < dvdemux->frame_len)
goto pause;
}
/* and decode the buffer */
ret = gst_dvdemux_demux_frame (dvdemux, buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pause;
/* and position ourselves for the next buffer */
dvdemux->byte_segment.last_stop += dvdemux->frame_len;
gst_object_unref (dvdemux);
return;
/* ERRORS */
parse_header_error:
{
GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
(NULL), ("Error parsing DV header"));
gst_buffer_unref (buffer);
ret = GST_FLOW_ERROR;
/* will stop the task */
goto pause;
}
eos:
{
GST_LOG_OBJECT (dvdemux, "got eos");
gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
/* pause with non-fatal error */
ret = GST_FLOW_WRONG_STATE;
goto pause;
}
pause:
{
GST_LOG_OBJECT (dvdemux, "pausing task %d", ret);
dvdemux->running = FALSE;
gst_pad_pause_task (dvdemux->sinkpad);
if (GST_FLOW_IS_FATAL (ret)) {
/* for fatal errors we post an error message */
GST_ELEMENT_ERROR (dvdemux, STREAM, FAILED,
(NULL), ("streaming stopped, reason %s", gst_flow_get_name (ret)));
gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
}
gst_object_unref (dvdemux);
}
}
static gboolean
gst_dvdemux_sink_activate_push (GstPad * sinkpad, gboolean active)
{
GstDVDemux *demux = GST_DVDEMUX (gst_pad_get_parent (sinkpad));
if (active) {
demux->seek_handler = gst_dvdemux_handle_push_seek;
} else {
demux->seek_handler = NULL;
}
gst_object_unref (demux);
return TRUE;
}
static gboolean
gst_dvdemux_sink_activate_pull (GstPad * sinkpad, gboolean active)
{
GstDVDemux *demux = GST_DVDEMUX (gst_pad_get_parent (sinkpad));
if (active) {
demux->running = TRUE;
demux->seek_handler = gst_dvdemux_handle_pull_seek;
gst_pad_start_task (sinkpad, (GstTaskFunction) gst_dvdemux_loop, sinkpad);
} else {
demux->seek_handler = NULL;
demux->running = FALSE;
gst_pad_stop_task (sinkpad);
}
gst_object_unref (demux);
return TRUE;
};
/* decide on push or pull based scheduling */
static gboolean
gst_dvdemux_sink_activate (GstPad * sinkpad)
{
gboolean ret;
if (gst_pad_check_pull_range (sinkpad))
ret = gst_pad_activate_pull (sinkpad, TRUE);
else
ret = gst_pad_activate_push (sinkpad, TRUE);
return ret;
};
static GstStateChangeReturn
gst_dvdemux_change_state (GstElement * element, GstStateChange transition)
{
GstDVDemux *dvdemux = GST_DVDEMUX (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
dvdemux->decoder = dv_decoder_new (0, FALSE, FALSE);
dv_set_error_log (dvdemux->decoder, NULL);
gst_dvdemux_reset (dvdemux);
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:
gst_adapter_clear (dvdemux->adapter);
dv_decoder_free (dvdemux->decoder);
dvdemux->decoder = NULL;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
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