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gstreamer/gst/mpegstream/gstdvddemux.c
Stefan Kost 253afc02c9 dvddemux: small code cleanup 
Don't duplicate the 'if' check. Makes the 2nd condition easier to read also
and avoid empty 'if' when logging is disabled.
2011-03-02 13:12:11 +02:00

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/* GStreamer
* Copyright (C) 2005 Martin Soto <martinsoto@users.sourceforge.net>
*
* 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 "gstdvddemux.h"
/*
* Move PTM discont back by 0.3 seconds to allow for strange audio
* timestamps when audio crosses a VOBU
*/
#define PTM_DISCONT_ADJUST (0.3 * GST_SECOND)
#define INITIAL_END_PTM (-1)
#define MAX_GAP ( 3 * GST_SECOND / 2 )
#define MAX_GAP_TOLERANCE ( GST_SECOND / 20 )
GST_DEBUG_CATEGORY_STATIC (gstdvddemux_debug);
#define GST_CAT_DEFAULT (gstdvddemux_debug)
#define PARSE_CLASS(o) GST_MPEG_PARSE_CLASS (G_OBJECT_GET_CLASS (o))
#define DEMUX_CLASS(o) GST_MPEG_DEMUX_CLASS (G_OBJECT_GET_CLASS (o))
#define CLASS(o) GST_DVD_DEMUX_CLASS (G_OBJECT_GET_CLASS (o))
/* DVDDemux signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
/* FILL ME */
};
/* Define the capabilities separately, to be able to reuse them. */
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) 2, " "systemstream = (boolean) TRUE")
);
#define VIDEO_CAPS \
GST_STATIC_CAPS ("video/mpeg, " \
"mpegversion = (int) { 1, 2 }, " \
"systemstream = (boolean) FALSE" \
)
#define AUDIO_CAPS \
GST_STATIC_CAPS ( \
"audio/mpeg, " \
"mpegversion = (int) 1;" \
"audio/x-lpcm, " \
"width = (int) { 16, 20, 24 }, " \
"rate = (int) { 48000, 96000 }, " \
"channels = (int) [ 1, 8 ], " \
"dynamic_range = (int) [ 0, 255 ], " \
"emphasis = (boolean) { FALSE, TRUE }, " \
"mute = (boolean) { FALSE, TRUE }; " \
"audio/x-ac3;" \
"audio/x-dts" \
)
#define SUBPICTURE_CAPS \
GST_STATIC_CAPS ("video/x-dvd-subpicture")
static GstStaticPadTemplate cur_video_template =
GST_STATIC_PAD_TEMPLATE ("current_video",
GST_PAD_SRC,
GST_PAD_ALWAYS,
VIDEO_CAPS);
static GstStaticPadTemplate audio_template =
GST_STATIC_PAD_TEMPLATE ("dvd_audio_%02d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
AUDIO_CAPS);
static GstStaticPadTemplate cur_audio_template =
GST_STATIC_PAD_TEMPLATE ("current_audio",
GST_PAD_SRC,
GST_PAD_ALWAYS,
AUDIO_CAPS);
static GstStaticPadTemplate subpicture_template =
GST_STATIC_PAD_TEMPLATE ("subpicture_%d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
SUBPICTURE_CAPS);
static GstStaticPadTemplate cur_subpicture_template =
GST_STATIC_PAD_TEMPLATE ("current_subpicture",
GST_PAD_SRC,
GST_PAD_ALWAYS,
SUBPICTURE_CAPS);
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gstdvddemux_debug, "dvddemux", 0, \
"DVD (VOB) demultiplexer element");
GST_BOILERPLATE_FULL (GstDVDDemux, gst_dvd_demux, GstMPEGDemux,
GST_TYPE_MPEG_DEMUX, _do_init);
static gboolean gst_dvd_demux_process_event (GstMPEGParse * mpeg_parse,
GstEvent * event);
static gboolean gst_dvd_demux_parse_packhead (GstMPEGParse * mpeg_parse,
GstBuffer * buffer);
static gboolean gst_dvd_demux_handle_dvd_event
(GstDVDDemux * dvd_demux, GstEvent * event);
static GstMPEGStream *gst_dvd_demux_get_video_stream
(GstMPEGDemux * mpeg_demux,
guint8 stream_nr, gint type, const gpointer info);
static GstMPEGStream *gst_dvd_demux_get_audio_stream
(GstMPEGDemux * dvd_demux,
guint8 stream_nr, gint type, const gpointer info);
static GstMPEGStream *gst_dvd_demux_get_subpicture_stream
(GstMPEGDemux * dvd_demux,
guint8 stream_nr, gint type, const gpointer info);
static GstFlowReturn gst_dvd_demux_process_private
(GstMPEGDemux * mpeg_demux,
GstBuffer * buffer,
guint stream_nr, GstClockTime timestamp, guint headerlen, guint datalen);
static GstFlowReturn gst_dvd_demux_send_subbuffer
(GstMPEGDemux * mpeg_demux,
GstMPEGStream * outstream,
GstBuffer * buffer, GstClockTime timestamp, guint offset, guint size);
static GstFlowReturn gst_dvd_demux_combine_flows (GstMPEGDemux * mpegdemux,
GstMPEGStream * stream, GstFlowReturn flow);
static void gst_dvd_demux_set_cur_audio
(GstDVDDemux * dvd_demux, gint stream_nr);
static void gst_dvd_demux_set_cur_subpicture
(GstDVDDemux * dvd_demux, gint stream_nr);
static void gst_dvd_demux_reset (GstDVDDemux * dvd_demux);
static void gst_dvd_demux_synchronise_pads (GstMPEGDemux * mpeg_demux,
GstClockTime threshold, GstClockTime new_ts);
static void gst_dvd_demux_sync_stream_to_time (GstMPEGDemux * mpeg_demux,
GstMPEGStream * stream, GstClockTime last_ts);
static GstStateChangeReturn gst_dvd_demux_change_state (GstElement * element,
GstStateChange transition);
/*static guint gst_dvd_demux_signals[LAST_SIGNAL] = { 0 };*/
static void
gst_dvd_demux_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstMPEGParseClass *mpeg_parse_class = GST_MPEG_PARSE_CLASS (klass);
GstMPEGDemuxClass *demux_class = GST_MPEG_DEMUX_CLASS (klass);
GstDVDDemuxClass *dvd_demux_class = GST_DVD_DEMUX_CLASS (klass);
mpeg_parse_class->send_buffer = NULL;
mpeg_parse_class->process_event = gst_dvd_demux_process_event;
mpeg_parse_class->parse_packhead = gst_dvd_demux_parse_packhead;
/* sink pad */
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
demux_class->audio_template = gst_static_pad_template_get (&audio_template);
dvd_demux_class->cur_video_template =
gst_static_pad_template_get (&cur_video_template);
dvd_demux_class->cur_audio_template =
gst_static_pad_template_get (&cur_audio_template);
dvd_demux_class->subpicture_template =
gst_static_pad_template_get (&subpicture_template);
dvd_demux_class->cur_subpicture_template =
gst_static_pad_template_get (&cur_subpicture_template);
gst_element_class_add_pad_template (element_class,
demux_class->audio_template);
gst_element_class_add_pad_template (element_class,
dvd_demux_class->cur_video_template);
gst_element_class_add_pad_template (element_class,
dvd_demux_class->cur_audio_template);
gst_element_class_add_pad_template (element_class,
dvd_demux_class->subpicture_template);
gst_element_class_add_pad_template (element_class,
dvd_demux_class->cur_subpicture_template);
gst_element_class_set_details_simple (element_class, "DVD Demuxer",
"Codec/Demuxer",
"Demultiplexes DVD (VOB) MPEG2 streams",
"Martin Soto <martinsoto@users.sourceforge.net>");
}
static void
gst_dvd_demux_class_init (GstDVDDemuxClass * klass)
{
GstElementClass *gstelement_class;
GstMPEGDemuxClass *mpeg_demux_class;
parent_class = g_type_class_peek_parent (klass);
gstelement_class = (GstElementClass *) klass;
mpeg_demux_class = (GstMPEGDemuxClass *) klass;
gstelement_class->change_state = gst_dvd_demux_change_state;
mpeg_demux_class->get_audio_stream = gst_dvd_demux_get_audio_stream;
mpeg_demux_class->get_video_stream = gst_dvd_demux_get_video_stream;
mpeg_demux_class->send_subbuffer = gst_dvd_demux_send_subbuffer;
mpeg_demux_class->combine_flows = gst_dvd_demux_combine_flows;
mpeg_demux_class->process_private = gst_dvd_demux_process_private;
mpeg_demux_class->synchronise_pads = gst_dvd_demux_synchronise_pads;
mpeg_demux_class->sync_stream_to_time = gst_dvd_demux_sync_stream_to_time;
klass->get_subpicture_stream = gst_dvd_demux_get_subpicture_stream;
}
static void
gst_dvd_demux_init (GstDVDDemux * dvd_demux, GstDVDDemuxClass * klass)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (dvd_demux);
gint i;
/* Create the pads for the current streams. */
dvd_demux->cur_video =
DEMUX_CLASS (dvd_demux)->new_output_pad (mpeg_demux, "current_video",
CLASS (dvd_demux)->cur_video_template);
gst_element_add_pad (GST_ELEMENT (mpeg_demux), dvd_demux->cur_video);
dvd_demux->cur_audio =
DEMUX_CLASS (dvd_demux)->new_output_pad (mpeg_demux, "current_audio",
CLASS (dvd_demux)->cur_audio_template);
gst_element_add_pad (GST_ELEMENT (mpeg_demux), dvd_demux->cur_audio);
dvd_demux->cur_subpicture =
DEMUX_CLASS (dvd_demux)->new_output_pad (mpeg_demux, "current_subpicture",
CLASS (dvd_demux)->cur_subpicture_template);
gst_element_add_pad (GST_ELEMENT (mpeg_demux), dvd_demux->cur_subpicture);
dvd_demux->mpeg_version = 0;
dvd_demux->cur_video_nr = 0;
dvd_demux->cur_audio_nr = 0;
dvd_demux->cur_subpicture_nr = 0;
for (i = 0; i < GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS; i++) {
dvd_demux->subpicture_stream[i] = NULL;
}
/* Directly after starting we operate as if we had just flushed. */
dvd_demux->segment_filter = TRUE;
dvd_demux->langcodes = NULL;
}
static gboolean
gst_dvd_demux_process_event (GstMPEGParse * mpeg_parse, GstEvent * event)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_parse);
gboolean ret = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
gst_event_parse_new_segment (event, &update, NULL, NULL,
NULL, NULL, NULL);
if (!update) {
/* This is a discontinuity in the timestamp sequence. which
may mean that we find some audio blocks lying outside the
segment. Filter them. */
dvd_demux->segment_filter = TRUE;
/* reset stream synchronization; parent handles other streams */
gst_mpeg_streams_reset_cur_ts (dvd_demux->subpicture_stream,
GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS, 0);
}
ret = GST_MPEG_PARSE_CLASS (parent_class)->process_event (mpeg_parse,
event);
break;
}
case GST_EVENT_FLUSH_STOP:
dvd_demux->segment_filter = TRUE;
ret = GST_MPEG_PARSE_CLASS (parent_class)->process_event (mpeg_parse,
event);
/* parent class will have reset the other streams */
gst_mpeg_streams_reset_last_flow (dvd_demux->subpicture_stream,
GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS);
break;
case GST_EVENT_CUSTOM_DOWNSTREAM:
case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
if (event->structure != NULL &&
gst_structure_has_name (event->structure, "application/x-gst-dvd")) {
ret = gst_dvd_demux_handle_dvd_event (dvd_demux, event);
} else {
ret = GST_MPEG_PARSE_CLASS (parent_class)->process_event (mpeg_parse,
event);
}
break;
default:
ret = GST_MPEG_PARSE_CLASS (parent_class)->process_event (mpeg_parse,
event);
break;
}
return ret;
}
static gboolean
gst_dvd_demux_handle_dvd_event (GstDVDDemux * dvd_demux, GstEvent * event)
{
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (dvd_demux);
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (dvd_demux);
const GstStructure *structure = gst_event_get_structure (event);
const char *event_type = gst_structure_get_string (structure, "event");
g_return_val_if_fail (event != NULL, FALSE);
GST_LOG_OBJECT (dvd_demux, "dvd event %" GST_PTR_FORMAT, structure);
if (strcmp (event_type, "dvd-audio-stream-change") == 0) {
gint stream_nr;
gst_structure_get_int (structure, "physical", &stream_nr);
if (stream_nr < -1 || stream_nr >= GST_MPEG_DEMUX_NUM_AUDIO_STREAMS) {
GST_ERROR_OBJECT (dvd_demux,
"GstDVDDemux: Invalid audio stream %02d", stream_nr);
return FALSE;
}
gst_dvd_demux_set_cur_audio (dvd_demux, stream_nr);
gst_event_unref (event);
} else if (strcmp (event_type, "dvd-spu-stream-change") == 0) {
gint stream_nr;
gst_structure_get_int (structure, "physical", &stream_nr);
if (stream_nr < -1 || stream_nr >= GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS) {
GST_ERROR_OBJECT (dvd_demux,
"GstDVDDemux: Invalid subpicture stream %02d", stream_nr);
return FALSE;
}
gst_dvd_demux_set_cur_subpicture (dvd_demux, stream_nr);
gst_event_unref (event);
} else if (!strcmp (event_type, "dvd-lang-codes")) {
gint num_substreams = 0, num_audstreams = 0, n;
gchar *t;
/* reset */
if (dvd_demux->langcodes)
gst_event_unref (dvd_demux->langcodes);
/* see what kind of streams we have */
dvd_demux->langcodes = event;
/* now create pads for each; first video */
n = 2;
DEMUX_CLASS (dvd_demux)->get_video_stream (mpeg_demux,
0, GST_MPEG_DEMUX_VIDEO_MPEG, &n);
/* audio */
for (n = 0;; n++) {
gint fmt, ifo = 0;
t = g_strdup_printf ("audio-%d-format", num_audstreams);
if (!gst_structure_get_int (structure, t, &fmt)) {
g_free (t);
break;
}
g_free (t);
switch (fmt) {
case 0x0: /* AC-3 */
fmt = GST_DVD_DEMUX_AUDIO_AC3;
break;
case 0x2:
case 0x3: /* MPEG */
fmt = GST_MPEG_DEMUX_AUDIO_MPEG;
break;
case 0x4:
fmt = GST_DVD_DEMUX_AUDIO_LPCM;
break;
case 0x6:
fmt = GST_DVD_DEMUX_AUDIO_DTS;
break;
default:
fmt = GST_MPEG_DEMUX_AUDIO_UNKNOWN;
break;
}
DEMUX_CLASS (dvd_demux)->get_audio_stream (mpeg_demux,
num_audstreams++, fmt, &ifo);
}
/* subtitle */
for (;;) {
t = g_strdup_printf ("subtitle-%d-language", num_substreams);
if (!gst_structure_get_value (structure, t)) {
g_free (t);
break;
}
g_free (t);
CLASS (dvd_demux)->get_subpicture_stream (mpeg_demux,
num_substreams++, GST_DVD_DEMUX_SUBP_DVD, NULL);
}
GST_DEBUG_OBJECT (dvd_demux,
"Created 1 video stream, %d audio streams and %d subpicture streams "
"based on DVD lang codes event; now signalling no-more-pads",
num_audstreams, num_substreams);
/* we know this will be all */
gst_element_no_more_pads (GST_ELEMENT (dvd_demux));
/* Keep video/audio/subtitle pads within 1/2 sec of the SCR */
mpeg_demux->max_gap = MAX_GAP;
mpeg_demux->max_gap_tolerance = MAX_GAP_TOLERANCE;
} else {
GST_DEBUG_OBJECT (dvd_demux, "dvddemux Forwarding DVD event %s to all pads",
event_type);
PARSE_CLASS (dvd_demux)->send_event (mpeg_parse, event);
}
return TRUE;
}
static GstMPEGStream *
gst_dvd_demux_get_video_stream (GstMPEGDemux * mpeg_demux,
guint8 stream_nr, gint type, const gpointer info)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_demux);
GstMPEGStream *str =
parent_class->get_video_stream (mpeg_demux, stream_nr, type, info);
gint mpeg_version = *((gint *) info);
if (dvd_demux->mpeg_version != mpeg_version) {
if (str->caps)
gst_caps_unref (str->caps);
str->caps = gst_caps_new_simple ("video/mpeg",
"mpegversion", G_TYPE_INT, mpeg_version,
"systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
if (!gst_pad_set_caps (dvd_demux->cur_video, str->caps)) {
GST_ELEMENT_ERROR (GST_ELEMENT (mpeg_demux),
CORE, NEGOTIATION, (NULL), ("failed to set caps"));
gst_caps_unref (str->caps);
str->caps = NULL;
return str;
} else {
dvd_demux->mpeg_version = mpeg_version;
}
}
dvd_demux->mpeg_version = mpeg_version;
return str;
}
static GstMPEGStream *
gst_dvd_demux_get_audio_stream (GstMPEGDemux * mpeg_demux,
guint8 stream_nr, gint type, const gpointer info)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_demux);
guint32 sample_info = 0;
GstMPEGStream *str;
GstDVDLPCMStream *lpcm_str = NULL;
gboolean add_pad = FALSE;
const gchar *codec = NULL, *lang_code = NULL;
g_return_val_if_fail (stream_nr < GST_MPEG_DEMUX_NUM_AUDIO_STREAMS, NULL);
g_return_val_if_fail (type > GST_MPEG_DEMUX_AUDIO_UNKNOWN &&
type < GST_DVD_DEMUX_AUDIO_LAST, NULL);
if (type < GST_MPEG_DEMUX_AUDIO_LAST) {
/* FIXME: language codes on MPEG audio streams */
return parent_class->get_audio_stream (mpeg_demux, stream_nr, type, info);
}
if (type == GST_DVD_DEMUX_AUDIO_LPCM) {
sample_info = *((guint32 *) info);
}
str = mpeg_demux->audio_stream[stream_nr];
/* If the stream type is changing, recreate the pad */
if (str && str->type != type) {
gst_element_remove_pad (GST_ELEMENT (mpeg_demux), str->pad);
g_free (str);
str = mpeg_demux->audio_stream[stream_nr] = NULL;
}
if (str == NULL) {
gchar *name;
if (type != GST_DVD_DEMUX_AUDIO_LPCM) {
str = g_new0 (GstMPEGStream, 1);
} else {
lpcm_str = g_new0 (GstDVDLPCMStream, 1);
str = (GstMPEGStream *) lpcm_str;
}
name = g_strdup_printf ("audio_%02d", stream_nr);
DEMUX_CLASS (dvd_demux)->init_stream (mpeg_demux, type, str, stream_nr,
name, DEMUX_CLASS (dvd_demux)->audio_template);
/* update caps */
str->type = GST_MPEG_DEMUX_AUDIO_UNKNOWN;
g_free (name);
add_pad = TRUE;
} else {
/* Stream size may have changed, reset it. */
if (type != GST_DVD_DEMUX_AUDIO_LPCM) {
str = g_renew (GstMPEGStream, str, 1);
} else {
lpcm_str = g_renew (GstDVDLPCMStream, str, 1);
str = (GstMPEGStream *) lpcm_str;
}
}
mpeg_demux->audio_stream[stream_nr] = str;
if (type != str->type ||
(type == GST_DVD_DEMUX_AUDIO_LPCM &&
sample_info != lpcm_str->sample_info)) {
gint width, rate, channels, dynamic_range;
gboolean emphasis, mute;
/* We need to set new caps for this pad. */
switch (type) {
case GST_DVD_DEMUX_AUDIO_LPCM:
/* Dynamic range in the lower byte */
dynamic_range = sample_info & 0xff;
/* Determine the sample width. */
switch (sample_info & 0xC000) {
case 0x8000:
width = 24;
break;
case 0x4000:
width = 20;
break;
default:
width = 16;
break;
}
/* Determine the rate. */
if (sample_info & 0x1000) {
rate = 96000;
} else {
rate = 48000;
}
mute = ((sample_info & 0x400000) != 0);
emphasis = ((sample_info & 0x800000) != 0);
/* Determine the number of channels. */
channels = ((sample_info >> 8) & 0x7) + 1;
if (str->caps)
gst_caps_unref (str->caps);
str->caps = gst_caps_new_simple ("audio/x-lpcm",
"width", G_TYPE_INT, width,
"rate", G_TYPE_INT, rate,
"channels", G_TYPE_INT, channels,
"dynamic_range", G_TYPE_INT, dynamic_range,
"emphasis", G_TYPE_BOOLEAN, emphasis,
"mute", G_TYPE_BOOLEAN, mute, NULL);
lpcm_str->sample_info = sample_info;
lpcm_str->width = width;
lpcm_str->rate = rate;
lpcm_str->channels = channels;
lpcm_str->dynamic_range = dynamic_range;
lpcm_str->mute = mute;
lpcm_str->emphasis = emphasis;
codec = "LPCM audio";
break;
case GST_DVD_DEMUX_AUDIO_AC3:
if (str->caps)
gst_caps_unref (str->caps);
str->caps = gst_caps_new_simple ("audio/x-ac3", NULL);
codec = "AC-3 audio";
break;
case GST_DVD_DEMUX_AUDIO_DTS:
if (str->caps)
gst_caps_unref (str->caps);
str->caps = gst_caps_new_simple ("audio/x-dts", NULL);
codec = "DTS audio";
break;
default:
g_return_val_if_reached (NULL);
break;
}
if (!gst_pad_set_caps (str->pad, str->caps)) {
GST_ELEMENT_ERROR (GST_ELEMENT (mpeg_demux),
CORE, NEGOTIATION, (NULL),
("failed to set caps on pad %s:%s", GST_DEBUG_PAD_NAME (str->pad)));
gst_caps_unref (str->caps);
str->caps = NULL;
return str;
}
if (str->number == dvd_demux->cur_audio_nr) {
/* This is the current audio stream. Use the same caps. */
if (!gst_pad_set_caps (dvd_demux->cur_audio, str->caps)) {
GST_ELEMENT_ERROR (GST_ELEMENT (mpeg_demux),
CORE, NEGOTIATION, (NULL), ("failed to set caps on pad %s:%s",
GST_DEBUG_PAD_NAME (dvd_demux->cur_audio)));
}
}
if (add_pad) {
if (dvd_demux->langcodes) {
gchar *t;
t = g_strdup_printf ("audio-%d-language", stream_nr);
lang_code =
gst_structure_get_string (gst_event_get_structure
(dvd_demux->langcodes), t);
g_free (t);
}
GST_DEBUG_OBJECT (mpeg_demux, "adding pad %s with language = %s",
GST_PAD_NAME (str->pad), (lang_code) ? lang_code : "(unknown)");
gst_pad_set_active (str->pad, TRUE);
gst_element_add_pad (GST_ELEMENT (mpeg_demux), str->pad);
if (codec || lang_code) {
GstTagList *list = gst_tag_list_new ();
if (codec) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_AUDIO_CODEC, codec, NULL);
}
if (lang_code) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_LANGUAGE_CODE, lang_code, NULL);
}
str->tags = gst_tag_list_copy (list);
gst_element_found_tags_for_pad (GST_ELEMENT (mpeg_demux),
str->pad, list);
}
}
str->type = type;
}
return str;
}
static GstMPEGStream *
gst_dvd_demux_get_subpicture_stream (GstMPEGDemux * mpeg_demux,
guint8 stream_nr, gint type, const gpointer info)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_demux);
GstMPEGStream *str;
gchar *name;
gboolean add_pad = FALSE;
const gchar *lang_code = NULL;
g_return_val_if_fail (stream_nr < GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS, NULL);
g_return_val_if_fail (type > GST_DVD_DEMUX_SUBP_UNKNOWN &&
type < GST_DVD_DEMUX_SUBP_LAST, NULL);
str = dvd_demux->subpicture_stream[stream_nr];
if (str == NULL) {
str = g_new0 (GstMPEGStream, 1);
name = g_strdup_printf ("subpicture_%02d", stream_nr);
DEMUX_CLASS (dvd_demux)->init_stream (mpeg_demux, type, str, stream_nr,
name, CLASS (dvd_demux)->subpicture_template);
str->type = GST_DVD_DEMUX_SUBP_UNKNOWN;
g_free (name);
add_pad = TRUE;
} else {
/* This stream may have been created by a derived class, reset the
size. */
str = g_renew (GstMPEGStream, str, 1);
}
dvd_demux->subpicture_stream[stream_nr] = str;
if (str->type != GST_DVD_DEMUX_SUBP_DVD) {
/* We need to set new caps for this pad. */
if (str->caps)
gst_caps_unref (str->caps);
str->caps = gst_caps_new_simple ("video/x-dvd-subpicture", NULL);
if (!gst_pad_set_caps (str->pad, str->caps)) {
GST_ELEMENT_ERROR (GST_ELEMENT (mpeg_demux),
CORE, NEGOTIATION, (NULL),
("failed to set caps on pad %s:%s", GST_DEBUG_PAD_NAME (str->pad)));
gst_caps_unref (str->caps);
str->caps = NULL;
return str;
}
if (str->number == dvd_demux->cur_subpicture_nr) {
/* This is the current subpicture stream. Use the same caps. */
if (!gst_pad_set_caps (dvd_demux->cur_subpicture, str->caps)) {
GST_ELEMENT_ERROR (GST_ELEMENT (mpeg_demux),
CORE, NEGOTIATION, (NULL),
("failed to set caps on pad %s:%s", GST_DEBUG_PAD_NAME (str->pad)));
}
}
if (add_pad) {
if (dvd_demux->langcodes) {
gchar *t;
t = g_strdup_printf ("subtitle-%d-language", stream_nr);
lang_code =
gst_structure_get_string (gst_event_get_structure
(dvd_demux->langcodes), t);
g_free (t);
}
GST_DEBUG_OBJECT (mpeg_demux, "adding pad %s with language = %s",
GST_PAD_NAME (str->pad), (lang_code) ? lang_code : "(unknown)");
gst_pad_set_active (str->pad, TRUE);
gst_element_add_pad (GST_ELEMENT (mpeg_demux), str->pad);
if (lang_code) {
GstTagList *list = gst_tag_list_new ();
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_LANGUAGE_CODE, lang_code, NULL);
str->tags = gst_tag_list_copy (list);
gst_element_found_tags_for_pad (GST_ELEMENT (mpeg_demux),
str->pad, list);
}
}
str->type = GST_DVD_DEMUX_SUBP_DVD;
}
return str;
}
static gboolean
gst_dvd_demux_parse_packhead (GstMPEGParse * mpeg_parse, GstBuffer * buffer)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (mpeg_parse);
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_parse);
gboolean pending_tags = mpeg_demux->pending_tags;
GST_MPEG_PARSE_CLASS (parent_class)->parse_packhead (mpeg_parse, buffer);
if (pending_tags) {
GstMPEGStream **streams;
guint i, num;
streams = dvd_demux->subpicture_stream;
num = GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS;
for (i = 0; i < num; ++i) {
if (streams[i] != NULL && streams[i]->tags != NULL)
gst_pad_push_event (streams[i]->pad,
gst_event_new_tag (gst_tag_list_copy (streams[i]->tags)));
}
}
return TRUE;
}
static GstFlowReturn
gst_dvd_demux_process_private (GstMPEGDemux * mpeg_demux,
GstBuffer * buffer,
guint stream_nr, GstClockTime timestamp, guint headerlen, guint datalen)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_demux);
GstFlowReturn ret = GST_FLOW_OK;
guint8 *basebuf;
guint8 ps_id_code;
GstMPEGStream *outstream = NULL;
guint first_access = 0;
gint align = 1, len, off;
basebuf = GST_BUFFER_DATA (buffer);
/* Determine the substream number. */
ps_id_code = basebuf[headerlen + 4];
/* In the following, the "first access" refers to the location in a
buffer the time stamp is associated to. DVDs include this
information explicitely. */
switch (stream_nr) {
case 0:
/* Private stream 1. */
if (ps_id_code >= 0x80 && ps_id_code <= 0x87) {
GST_LOG_OBJECT (dvd_demux,
"we have an audio (AC3) packet, track %d", ps_id_code - 0x80);
outstream = DEMUX_CLASS (dvd_demux)->get_audio_stream (mpeg_demux,
ps_id_code - 0x80, GST_DVD_DEMUX_AUDIO_AC3, NULL);
/* Determine the position of the "first access". This
should always be the beginning of an AC3 frame. */
first_access = (basebuf[headerlen + 6] << 8) | basebuf[headerlen + 7];
headerlen += 4;
datalen -= 4;
} else if (ps_id_code >= 0x88 && ps_id_code <= 0x8f) {
GST_LOG_OBJECT (dvd_demux,
"we have an audio (DTS) packet, track %d", ps_id_code - 0x88);
outstream = DEMUX_CLASS (dvd_demux)->get_audio_stream (mpeg_demux,
ps_id_code - 0x88, GST_DVD_DEMUX_AUDIO_DTS, NULL);
/* Determine the position of the "first access". This
should always be the beginning of a DTS frame. */
first_access = (basebuf[headerlen + 6] << 8) | basebuf[headerlen + 7];
headerlen += 4;
datalen -= 4;
} else if (ps_id_code >= 0xA0 && ps_id_code <= 0xA7) {
GstDVDLPCMStream *lpcm_str;
guint32 lpcm_sample_info;
GST_LOG_OBJECT (dvd_demux,
"we have an audio (LPCM) packet, track %d", ps_id_code - 0xA0);
/* Compose the sample info from the LPCM header, masking out the frame_num */
lpcm_sample_info =
basebuf[headerlen + 10] | (basebuf[headerlen +
9] << 8) | ((basebuf[headerlen + 8] & 0xc0) << 16);
outstream = DEMUX_CLASS (dvd_demux)->get_audio_stream (mpeg_demux,
ps_id_code - 0xA0, GST_DVD_DEMUX_AUDIO_LPCM, &lpcm_sample_info);
lpcm_str = (GstDVDLPCMStream *) outstream;
/* Determine the position of the "first access". */
first_access = (basebuf[headerlen + 6] << 8) | basebuf[headerlen + 7];
/* Get rid of the LPCM header. */
headerlen += 7;
datalen -= 7;
/* align by frame round up to nearest byte */
align = (lpcm_str->width * lpcm_str->channels + 7) / 8;
} else if (ps_id_code >= 0x20 && ps_id_code <= 0x3F) {
GST_LOG_OBJECT (dvd_demux,
"we have a subpicture packet, track %d", ps_id_code - 0x20);
outstream = CLASS (dvd_demux)->get_subpicture_stream (mpeg_demux,
ps_id_code - 0x20, GST_DVD_DEMUX_SUBP_DVD, NULL);
headerlen += 1;
datalen -= 1;
} else {
GST_WARNING_OBJECT (dvd_demux,
"unknown DVD (private 1) id 0x%02x", ps_id_code);
}
break;
case 1:
/* Private stream 2 */
switch (ps_id_code) {
case 0:
GST_LOG_OBJECT (dvd_demux, "we have a PCI nav packet");
outstream = DEMUX_CLASS (mpeg_demux)->get_private_stream (mpeg_demux,
1, GST_MPEG_DEMUX_PRIVATE_UNKNOWN, NULL);
break;
case 1:
GST_LOG_OBJECT (dvd_demux, "we have a DSI nav packet");
outstream = DEMUX_CLASS (mpeg_demux)->get_private_stream (mpeg_demux,
1, GST_MPEG_DEMUX_PRIVATE_UNKNOWN, NULL);
break;
default:
GST_WARNING_OBJECT (dvd_demux,
"unknown DVD (private 2) id 0x%02x", ps_id_code);
break;
}
break;
default:
g_return_val_if_reached (GST_FLOW_UNEXPECTED);
break;
}
if (outstream == NULL) {
return GST_FLOW_OK;
}
if (timestamp != GST_CLOCK_TIME_NONE && first_access > 1) {
/* We have a first access location. Since GStreamer doesn't have
a means to associate a timestamp to the middle of a buffer, we
send two separate buffers and put the timestamp in the second
one. */
off = headerlen + 4;
len = first_access - 1;
len -= len % align;
if (len > 0) {
ret = DEMUX_CLASS (dvd_demux)->send_subbuffer (mpeg_demux, outstream,
buffer, GST_CLOCK_TIME_NONE, off, len);
}
off += len;
len = datalen - len;
len -= len % align;
if (len > 0) {
ret = DEMUX_CLASS (dvd_demux)->send_subbuffer (mpeg_demux, outstream,
buffer, timestamp, off, len);
}
} else {
off = headerlen + 4;
len = datalen;
len -= len % align;
if (len > 0) {
ret = DEMUX_CLASS (dvd_demux)->send_subbuffer (mpeg_demux, outstream,
buffer, timestamp, off, len);
}
}
return ret;
}
/* random magic value */
#define MIN_BUFS_FOR_NO_MORE_PADS 100
static GstFlowReturn
gst_dvd_demux_combine_flows (GstMPEGDemux * mpegdemux, GstMPEGStream * stream,
GstFlowReturn flow)
{
GstDVDDemux *demux = (GstDVDDemux *) mpegdemux;
gint i;
/* store the value */
stream->last_flow = flow;
/* if it's success we can return the value right away */
if (flow == GST_FLOW_OK)
goto done;
/* any other error that is not-linked can be returned right
* away */
if (flow != GST_FLOW_NOT_LINKED) {
GST_DEBUG_OBJECT (demux, "flow %s on pad %" GST_PTR_FORMAT,
gst_flow_get_name (flow), stream->pad);
goto done;
}
/* let parent class check for anything non-not-linked for its streams */
flow =
GST_MPEG_DEMUX_CLASS (parent_class)->combine_flows (mpegdemux, stream,
flow);
if (flow != GST_FLOW_NOT_LINKED)
goto done;
/* only return NOT_LINKED if all other pads returned NOT_LINKED */
for (i = 0; i < GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS; i++) {
if (demux->subpicture_stream[i] != NULL) {
flow = demux->subpicture_stream[i]->last_flow;
/* some other return value (must be SUCCESS but we can return
* other values as well) */
if (flow != GST_FLOW_NOT_LINKED)
goto done;
if (demux->subpicture_stream[i]->buffers_sent < MIN_BUFS_FOR_NO_MORE_PADS) {
flow = GST_FLOW_OK;
goto done;
}
}
}
/* if we get here, all other pads were unlinked and we return
* NOT_LINKED then */
GST_DEBUG_OBJECT (demux, "all pads combined have not-linked flow");
done:
return flow;
}
static GstFlowReturn
gst_dvd_demux_send_subbuffer (GstMPEGDemux * mpeg_demux,
GstMPEGStream * outstream, GstBuffer * buffer,
GstClockTime timestamp, guint offset, guint size)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_demux);
GstFlowReturn ret;
GstPad *outpad;
gint cur_nr;
if (dvd_demux->segment_filter &&
GST_MPEG_DEMUX_STREAM_KIND (outstream->type) ==
GST_MPEG_DEMUX_STREAM_AUDIO) {
/* We are in segment_filter mode and have an audio buffer. */
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* This is the first valid audio buffer after the flush. */
dvd_demux->segment_filter = FALSE;
} else {
/* Discard the buffer. */
return GST_FLOW_OK;
}
}
/* You never know what happens to a buffer when you send it. Just
in case, we keep a reference to the buffer during the execution
of this function. */
gst_buffer_ref (buffer);
/* Send the buffer to the standard output pad. */
ret = parent_class->send_subbuffer (mpeg_demux, outstream, buffer,
timestamp, offset, size);
/* Determine the current output pad and stream number for the given
type of stream. */
switch (GST_MPEG_DEMUX_STREAM_KIND (outstream->type)) {
case GST_MPEG_DEMUX_STREAM_VIDEO:
outpad = dvd_demux->cur_video;
cur_nr = dvd_demux->cur_video_nr;
break;
case GST_MPEG_DEMUX_STREAM_AUDIO:
outpad = dvd_demux->cur_audio;
cur_nr = dvd_demux->cur_audio_nr;
break;
case GST_MPEG_DEMUX_STREAM_PRIVATE:
outpad = NULL;
cur_nr = 0;
break;
case GST_DVD_DEMUX_STREAM_SUBPICTURE:
outpad = dvd_demux->cur_subpicture;
cur_nr = dvd_demux->cur_subpicture_nr;
break;
default:
g_return_val_if_reached (GST_FLOW_UNEXPECTED);
break;
}
if (outpad != NULL && cur_nr == outstream->number && size > 0) {
GstBuffer *outbuf;
/* We have a packet of the current stream. Send it to the
corresponding pad as well. */
outbuf = gst_buffer_create_sub (buffer, offset, size);
g_return_val_if_fail (outbuf != NULL, GST_FLOW_UNEXPECTED);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + offset;
gst_buffer_set_caps (outbuf, outstream->caps);
ret = gst_pad_push (outpad, outbuf);
/* this was one of the current_foo pads, which is shadowing one of the
* foo_%02d pads, so since we keep track of the last flow value in the
* stream structure we need to combine the OK/NOT_LINKED flows here
* (because both pads share the same stream structure) */
if ((ret == GST_FLOW_NOT_LINKED && outstream->last_flow == GST_FLOW_OK) ||
(ret == GST_FLOW_OK && outstream->last_flow == GST_FLOW_NOT_LINKED)) {
outstream->last_flow = GST_FLOW_OK;
ret = GST_FLOW_OK;
}
}
gst_buffer_unref (buffer);
ret = DEMUX_CLASS (dvd_demux)->combine_flows (mpeg_demux, outstream, ret);
return ret;
}
static void
gst_dvd_demux_set_cur_audio (GstDVDDemux * dvd_demux, gint stream_nr)
{
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (dvd_demux);
GstMPEGStream *str;
GstCaps *caps;
g_return_if_fail (stream_nr >= -1 &&
stream_nr < GST_MPEG_DEMUX_NUM_AUDIO_STREAMS);
GST_DEBUG_OBJECT (dvd_demux, "changing current audio to %02d", stream_nr);
dvd_demux->cur_audio_nr = stream_nr;
if (stream_nr == -1) {
return;
}
str = mpeg_demux->audio_stream[stream_nr];
if (str != NULL) {
/* (Re)set the caps in the "current" pad. */
caps = GST_PAD_CAPS (str->pad);
if (caps != NULL) {
gst_pad_set_caps (dvd_demux->cur_audio, caps);
}
}
}
static void
gst_dvd_demux_set_cur_subpicture (GstDVDDemux * dvd_demux, gint stream_nr)
{
GstMPEGStream *str;
g_return_if_fail (stream_nr >= -1 &&
stream_nr < GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS);
GST_DEBUG_OBJECT (dvd_demux, "changing current subpicture to %02d",
stream_nr);
dvd_demux->cur_subpicture_nr = stream_nr;
if (stream_nr == -1) {
return;
}
str = dvd_demux->subpicture_stream[stream_nr];
if (str != NULL) {
GstCaps *caps = NULL;
/* (Re)set the caps in the "current" pad. */
caps = GST_PAD_CAPS (str->pad);
gst_pad_set_caps (dvd_demux->cur_subpicture, caps);
}
}
static void
gst_dvd_demux_reset (GstDVDDemux * dvd_demux)
{
int i;
GstMPEGDemux *mpeg_demux = GST_MPEG_DEMUX (dvd_demux);
GST_INFO ("Resetting the dvd demuxer");
for (i = 0; i < GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS; i++) {
if (dvd_demux->subpicture_stream[i]) {
gst_pad_push_event (dvd_demux->subpicture_stream[i]->pad,
gst_event_new_eos ());
gst_element_remove_pad (GST_ELEMENT (dvd_demux),
dvd_demux->subpicture_stream[i]->pad);
if (dvd_demux->subpicture_stream[i]->caps)
gst_caps_unref (dvd_demux->subpicture_stream[i]->caps);
if (dvd_demux->subpicture_stream[i]->tags)
gst_tag_list_free (dvd_demux->subpicture_stream[i]->tags);
g_free (dvd_demux->subpicture_stream[i]);
dvd_demux->subpicture_stream[i] = NULL;
}
}
gst_pad_set_caps (dvd_demux->cur_video, NULL);
gst_pad_set_caps (dvd_demux->cur_audio, NULL);
gst_pad_set_caps (dvd_demux->cur_subpicture, NULL);
dvd_demux->cur_video_nr = 0;
dvd_demux->cur_audio_nr = 0;
dvd_demux->cur_subpicture_nr = 0;
dvd_demux->mpeg_version = 0;
/* Reset max_gap handling */
mpeg_demux->max_gap = MAX_GAP;
mpeg_demux->max_gap_tolerance = MAX_GAP_TOLERANCE;
}
static void
gst_dvd_demux_synchronise_pads (GstMPEGDemux * mpeg_demux,
GstClockTime threshold, GstClockTime new_ts)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_demux);
int i;
parent_class->synchronise_pads (mpeg_demux, threshold, new_ts);
for (i = 0; i < GST_DVD_DEMUX_NUM_SUBPICTURE_STREAMS; i++) {
if (dvd_demux->subpicture_stream[i]) {
GST_LOG_OBJECT (mpeg_demux, "stream: %d, current: %" GST_TIME_FORMAT
", threshold %" GST_TIME_FORMAT, i,
GST_TIME_ARGS (dvd_demux->subpicture_stream[i]->cur_ts),
GST_TIME_ARGS (threshold));
if (dvd_demux->subpicture_stream[i]->cur_ts < threshold) {
DEMUX_CLASS (mpeg_demux)->sync_stream_to_time (mpeg_demux,
dvd_demux->subpicture_stream[i], new_ts);
dvd_demux->subpicture_stream[i]->cur_ts = new_ts;
}
}
}
}
static void
gst_dvd_demux_sync_stream_to_time (GstMPEGDemux * mpeg_demux,
GstMPEGStream * stream, GstClockTime last_ts)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (mpeg_demux);
GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (mpeg_demux);
GstPad *outpad;
gint cur_nr;
parent_class->sync_stream_to_time (mpeg_demux, stream, last_ts);
switch (GST_MPEG_DEMUX_STREAM_KIND (stream->type)) {
case GST_MPEG_DEMUX_STREAM_VIDEO:
outpad = dvd_demux->cur_video;
cur_nr = dvd_demux->cur_video_nr;
break;
case GST_MPEG_DEMUX_STREAM_AUDIO:
outpad = dvd_demux->cur_audio;
cur_nr = dvd_demux->cur_audio_nr;
break;
case GST_DVD_DEMUX_STREAM_SUBPICTURE:
outpad = dvd_demux->cur_subpicture;
cur_nr = dvd_demux->cur_subpicture_nr;
break;
default:
return;
}
if (outpad && (cur_nr == stream->number)) {
guint64 update_time;
update_time =
MIN ((guint64) last_ts, (guint64) mpeg_parse->current_segment.stop);
gst_pad_push_event (outpad, gst_event_new_new_segment (TRUE,
mpeg_parse->current_segment.rate, GST_FORMAT_TIME,
update_time, mpeg_parse->current_segment.stop, update_time));
}
}
static GstStateChangeReturn
gst_dvd_demux_change_state (GstElement * element, GstStateChange transition)
{
GstDVDDemux *dvd_demux = GST_DVD_DEMUX (element);
GstStateChangeReturn ret;
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_dvd_demux_reset (dvd_demux);
if (dvd_demux->langcodes) {
gst_event_unref (dvd_demux->langcodes);
dvd_demux->langcodes = NULL;
}
break;
default:
break;
}
return ret;
}
gboolean
gst_dvd_demux_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "dvddemux",
GST_RANK_SECONDARY + 1, GST_TYPE_DVD_DEMUX);
}
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