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gstreamer/gst/dvdsub/gstdvdsubdec.c
Mark Nauwelaerts 5c5d85f8cc gst/dvdsub/: Add dvd subtitle parser, which just packetizes the input stream. This is needed to mux dvd subtitles int... 
Original commit message from CVS:
Patch by: Mark Nauwelaerts <mnauw at users.sourceforge.net>
* gst/dvdsub/Makefile.am:
* gst/dvdsub/gstdvdsubdec.c:
* gst/dvdsub/gstdvdsubparse.c:
* gst/dvdsub/gstdvdsubparse.h:
Add dvd subtitle parser, which just packetizes the input
stream. This is needed to mux dvd subtitles into matroska
files, since the muxer expects unfragmented and properly
timestamped input (#415754).
2007-10-13 15:13:34 +00:00

1005 lines
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/* GStreamer
* Copyright (C) <2005> Jan Schmidt <jan@fluendo.com>
* Copyright (C) <2002> 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.
*/
/* TODO: liboil-ise code, esp. use _splat() family of functions */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstdvdsubdec.h"
#include "gstdvdsubparse.h"
#include <string.h>
GST_BOILERPLATE (GstDvdSubDec, gst_dvd_sub_dec, GstElement, GST_TYPE_ELEMENT);
static gboolean gst_dvd_sub_dec_src_event (GstPad * srcpad, GstEvent * event);
static GstFlowReturn gst_dvd_sub_dec_chain (GstPad * pad, GstBuffer * buf);
static gboolean gst_dvd_sub_dec_handle_dvd_event (GstDvdSubDec * dec,
GstEvent * event);
static void gst_dvd_sub_dec_finalize (GObject * gobject);
static void gst_setup_palette (GstDvdSubDec * dec);
static void gst_dvd_sub_dec_merge_title (GstDvdSubDec * dec, GstBuffer * buf);
static GstClockTime gst_dvd_sub_dec_get_event_delay (GstDvdSubDec * dec);
static gboolean gst_dvd_sub_dec_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_send_subtitle_frame (GstDvdSubDec * dec,
GstClockTime end_ts);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv, format = (fourcc) AYUV, "
"width = (int) 720, height = (int) 576, framerate = (fraction) 0/1")
);
static GstStaticPadTemplate subtitle_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-dvd-subpicture")
);
GST_DEBUG_CATEGORY_STATIC (gst_dvd_sub_dec_debug);
#define GST_CAT_DEFAULT (gst_dvd_sub_dec_debug)
enum
{
SPU_FORCE_DISPLAY = 0x00,
SPU_SHOW = 0x01,
SPU_HIDE = 0x02,
SPU_SET_PALETTE = 0x03,
SPU_SET_ALPHA = 0x04,
SPU_SET_SIZE = 0x05,
SPU_SET_OFFSETS = 0x06,
SPU_WIPE = 0x07,
SPU_END = 0xff
};
static const guint32 default_clut[16] = {
0xb48080, 0x248080, 0x628080, 0xd78080,
0x808080, 0x808080, 0x808080, 0x808080,
0x808080, 0x808080, 0x808080, 0x808080,
0x808080, 0x808080, 0x808080, 0x808080
};
typedef struct RLE_state
{
gint id;
gint aligned;
gint offset[2];
gint hl_left;
gint hl_right;
guchar *target;
guchar next;
}
RLE_state;
static void
gst_dvd_sub_dec_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&subtitle_template));
gst_element_class_set_details_simple (element_class, "DVD subtitle decoder",
"Codec/Decoder/Video", "Decodes DVD subtitles into AYUV video frames",
"Wim Taymans <wim.taymans@gmail.com>, "
"Jan Schmidt <thaytan@mad.scientist.com>");
}
static void
gst_dvd_sub_dec_class_init (GstDvdSubDecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_dvd_sub_dec_finalize;
}
static void
gst_dvd_sub_dec_init (GstDvdSubDec * dec, GstDvdSubDecClass * klass)
{
GstPadTemplate *tmpl;
dec->sinkpad = gst_pad_new_from_static_template (&subtitle_template, "sink");
gst_pad_set_chain_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvd_sub_dec_chain));
gst_pad_set_event_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_dvd_sub_dec_sink_event));
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
tmpl = gst_static_pad_template_get (&src_template);
dec->srcpad = gst_pad_new_from_template (tmpl, "src");
gst_pad_set_event_function (dec->srcpad,
GST_DEBUG_FUNCPTR (gst_dvd_sub_dec_src_event));
gst_pad_use_fixed_caps (dec->srcpad);
gst_pad_set_caps (dec->srcpad, gst_pad_template_get_caps (tmpl));
gst_object_unref (tmpl);
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
/* FIXME: aren't there more possible sizes? (tpm) */
dec->in_width = 720;
dec->in_height = 576;
dec->partialbuf = NULL;
dec->have_title = FALSE;
dec->parse_pos = NULL;
dec->forced_display = FALSE;
dec->visible = FALSE;
memset (dec->menu_index, 0, sizeof (dec->menu_index));
memset (dec->menu_alpha, 0, sizeof (dec->menu_alpha));
memset (dec->subtitle_index, 0, sizeof (dec->subtitle_index));
memset (dec->subtitle_alpha, 0, sizeof (dec->subtitle_alpha));
memcpy (dec->current_clut, default_clut, sizeof (guint32) * 16);
gst_setup_palette (dec);
dec->next_ts = 0;
dec->next_event_ts = GST_CLOCK_TIME_NONE;
dec->out_buffer = NULL;
dec->buf_dirty = TRUE;
}
static void
gst_dvd_sub_dec_finalize (GObject * gobject)
{
GstDvdSubDec *dec = GST_DVD_SUB_DEC (gobject);
if (dec->partialbuf) {
gst_buffer_unref (dec->partialbuf);
dec->partialbuf = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (gobject);
}
static gboolean
gst_dvd_sub_dec_src_event (GstPad * pad, GstEvent * event)
{
GstDvdSubDec *dec = GST_DVD_SUB_DEC (gst_pad_get_parent (pad));
gboolean res = FALSE;
switch (GST_EVENT_TYPE (event)) {
default:
res = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (dec);
return res;
}
static GstClockTime
gst_dvd_sub_dec_get_event_delay (GstDvdSubDec * dec)
{
guchar *start = GST_BUFFER_DATA (dec->partialbuf);
guchar *buf;
guint16 ticks;
GstClockTime event_delay;
/* If starting a new buffer, follow the first DCSQ ptr */
if (dec->parse_pos == start) {
buf = dec->parse_pos + dec->data_size;
} else {
buf = dec->parse_pos;
}
ticks = GST_READ_UINT16_BE (buf);
event_delay = gst_util_uint64_scale (ticks, 1024 * GST_SECOND, 90000);
GST_DEBUG_OBJECT (dec, "returning delay %" GST_TIME_FORMAT " from offset %u",
GST_TIME_ARGS (event_delay), (guint) (buf - dec->parse_pos));
return event_delay;
}
/*
* Parse the next event time in the current subpicture buffer, stopping
* when time advances to the next state.
*/
static void
gst_dvd_sub_dec_parse_subpic (GstDvdSubDec * dec)
{
#define PARSE_BYTES_NEEDED(x) if ((buf+(x)) >= end) \
{ GST_WARNING("Subtitle stream broken parsing %c", *buf); \
broken = TRUE; break; }
guchar *start = GST_BUFFER_DATA (dec->partialbuf);
guchar *buf;
guchar *end;
gboolean broken = FALSE;
gboolean last_seq = FALSE;
guchar *next_seq = NULL;
GstClockTime event_time;
/* nothing to do if we finished this buffer already */
if (dec->parse_pos == NULL)
return;
g_return_if_fail (dec->packet_size >= 4);
end = start + dec->packet_size;
if (dec->parse_pos == start) {
buf = dec->parse_pos + dec->data_size;
} else {
buf = dec->parse_pos;
}
g_assert (buf >= start && buf < end);
/* If the next control sequence is at the current offset, this is
* the last one */
next_seq = start + GST_READ_UINT16_BE (buf + 2);
last_seq = (next_seq == buf);
buf += 4;
while ((buf < end) && (!broken)) {
switch (*buf) {
case SPU_FORCE_DISPLAY: /* Forced display menu subtitle */
dec->forced_display = TRUE;
dec->buf_dirty = TRUE;
GST_DEBUG_OBJECT (dec, "SPU FORCE_DISPLAY");
buf++;
break;
case SPU_SHOW: /* Show the subtitle in this packet */
dec->visible = TRUE;
dec->buf_dirty = TRUE;
GST_DEBUG_OBJECT (dec, "SPU SHOW at %" GST_TIME_FORMAT,
GST_TIME_ARGS (dec->next_event_ts));
buf++;
break;
case SPU_HIDE:
/* 02 ff (ff) is the end of the packet, hide the subpicture */
dec->visible = FALSE;
dec->buf_dirty = TRUE;
GST_DEBUG_OBJECT (dec, "SPU HIDE at %" GST_TIME_FORMAT,
GST_TIME_ARGS (dec->next_event_ts));
buf++;
break;
case SPU_SET_PALETTE: /* palette */
PARSE_BYTES_NEEDED (3);
GST_DEBUG_OBJECT (dec, "SPU SET_PALETTE");
dec->subtitle_index[3] = buf[1] >> 4;
dec->subtitle_index[2] = buf[1] & 0xf;
dec->subtitle_index[1] = buf[2] >> 4;
dec->subtitle_index[0] = buf[2] & 0xf;
gst_setup_palette (dec);
dec->buf_dirty = TRUE;
buf += 3;
break;
case SPU_SET_ALPHA: /* transparency palette */
PARSE_BYTES_NEEDED (3);
GST_DEBUG_OBJECT (dec, "SPU SET_ALPHA");
dec->subtitle_alpha[3] = buf[1] >> 4;
dec->subtitle_alpha[2] = buf[1] & 0xf;
dec->subtitle_alpha[1] = buf[2] >> 4;
dec->subtitle_alpha[0] = buf[2] & 0xf;
gst_setup_palette (dec);
dec->buf_dirty = TRUE;
buf += 3;
break;
case SPU_SET_SIZE: /* image coordinates */
PARSE_BYTES_NEEDED (7);
dec->left =
CLAMP ((((guint) buf[1]) << 4) | (buf[2] >> 4), 0,
(dec->in_width - 1));
dec->top =
CLAMP ((((guint) buf[4]) << 4) | (buf[5] >> 4), 0,
(dec->in_height - 1));
dec->right =
CLAMP ((((buf[2] & 0x0f) << 8) | buf[3]), 0, (dec->in_width - 1));
dec->bottom =
CLAMP ((((buf[5] & 0x0f) << 8) | buf[6]), 0, (dec->in_height - 1));
GST_DEBUG_OBJECT (dec, "SPU SET_SIZE left %d, top %d, right %d, "
"bottom %d", dec->left, dec->top, dec->right, dec->bottom);
dec->buf_dirty = TRUE;
buf += 7;
break;
case SPU_SET_OFFSETS: /* image 1 / image 2 offsets */
PARSE_BYTES_NEEDED (5);
dec->offset[0] = (((guint) buf[1]) << 8) | buf[2];
dec->offset[1] = (((guint) buf[3]) << 8) | buf[4];
GST_DEBUG_OBJECT (dec, "Offset1 %d, Offset2 %d",
dec->offset[0], dec->offset[1]);
dec->buf_dirty = TRUE;
buf += 5;
break;
case SPU_WIPE:
{
guint length;
PARSE_BYTES_NEEDED (3);
GST_WARNING_OBJECT (dec, "SPU_WIPE not yet implemented");
length = (buf[1] << 8) | (buf[2]);
buf += 1 + length;
dec->buf_dirty = TRUE;
break;
}
case SPU_END:
buf = (last_seq) ? end : next_seq;
/* Start a new control sequence */
if (buf + 4 < end) {
guint16 ticks = GST_READ_UINT16_BE (buf);
event_time = gst_util_uint64_scale (ticks, 1024 * GST_SECOND, 90000);
GST_DEBUG_OBJECT (dec,
"Next DCSQ at offset %d, delay %g secs (%d ticks)", buf - start,
gst_util_guint64_to_gdouble (event_time / GST_SECOND), ticks);
dec->parse_pos = buf;
if (event_time > 0) {
dec->next_event_ts += event_time;
GST_LOG_OBJECT (dec, "Exiting parse loop with time %g",
gst_guint64_to_gdouble (dec->next_event_ts) /
gst_guint64_to_gdouble (GST_SECOND));
return;
}
} else {
dec->parse_pos = NULL;
dec->next_event_ts = GST_CLOCK_TIME_NONE;
GST_LOG_OBJECT (dec, "Finished all cmds. Exiting parse loop");
return;
}
default:
GST_ERROR
("Invalid sequence in subtitle packet header (%.2x). Skipping",
*buf);
broken = TRUE;
dec->parse_pos = NULL;
break;
}
}
}
static inline int
gst_get_nibble (guchar * buffer, RLE_state * state)
{
if (state->aligned) {
state->next = buffer[state->offset[state->id]++];
state->aligned = 0;
return state->next >> 4;
} else {
state->aligned = 1;
return state->next & 0xf;
}
}
/* Premultiply the current lookup table into the "target" cache */
static void
gst_setup_palette (GstDvdSubDec * dec)
{
gint i;
guint32 col;
YUVA_val *target = dec->palette_cache;
YUVA_val *target2 = dec->hl_palette_cache;
for (i = 0; i < 4; i++, target2++, target++) {
col = dec->current_clut[dec->subtitle_index[i]];
target->Y = (col >> 16) & 0xff;
target->V = (col >> 8) & 0xff;
target->U = col & 0xff;
target->A = dec->subtitle_alpha[i] * 0xff / 0xf;
col = dec->current_clut[dec->menu_index[i]];
target2->Y = (col >> 16) & 0xff;
target2->V = (col >> 8) & 0xff;
target2->U = col & 0xff;
target2->A = dec->menu_alpha[i] * 0xff / 0xf;
}
}
static inline guint
gst_get_rle_code (guchar * buffer, RLE_state * state)
{
gint code;
code = gst_get_nibble (buffer, state);
if (code < 0x4) { /* 4 .. f */
code = (code << 4) | gst_get_nibble (buffer, state);
if (code < 0x10) { /* 1x .. 3x */
code = (code << 4) | gst_get_nibble (buffer, state);
if (code < 0x40) { /* 04x .. 0fx */
code = (code << 4) | gst_get_nibble (buffer, state);
}
}
}
return code;
}
#define DRAW_RUN(target,len,c) \
G_STMT_START { \
if ((c)->A) { \
gint i; \
for (i = 0; i < (len); i++) { \
*(target)++ = (c)->A; \
*(target)++ = (c)->Y; \
*(target)++ = (c)->U; \
*(target)++ = (c)->V; \
} \
} else { \
(target) += 4 * (len); \
} \
} G_STMT_END
/*
* This function steps over each run-length segment, drawing
* into the YUVA buffers as it goes. UV are composited and then output
* at half width/height
*/
static void
gst_draw_rle_line (GstDvdSubDec * dec, guchar * buffer, RLE_state * state)
{
gint length, colourid;
guint code;
gint x, right;
guchar *target;
target = state->target;
x = dec->left;
right = dec->right + 1;
while (x < right) {
gboolean in_hl;
const YUVA_val *colour_entry;
code = gst_get_rle_code (buffer, state);
length = code >> 2;
colourid = code & 3;
colour_entry = dec->palette_cache + colourid;
/* Length = 0 implies fill to the end of the line */
/* Restrict the colour run to the end of the line */
if (length == 0 || x + length > right)
length = right - x;
/* Check if this run of colour touches the highlight region */
in_hl = ((x <= state->hl_right) && (x + length) >= state->hl_left);
if (in_hl) {
gint run;
/* Draw to the left of the highlight */
if (x <= state->hl_left) {
run = MIN (length, state->hl_left - x + 1);
DRAW_RUN (target, run, colour_entry);
length -= run;
x += run;
}
/* Draw across the highlight region */
if (x <= state->hl_right) {
const YUVA_val *hl_colour = dec->hl_palette_cache + colourid;
run = MIN (length, state->hl_right - x + 1);
DRAW_RUN (target, run, hl_colour);
length -= run;
x += run;
}
}
/* Draw the rest of the run */
if (length > 0) {
DRAW_RUN (target, length, colour_entry);
x += length;
}
}
}
/*
* Decode the RLE subtitle image and blend with the current
* frame buffer.
*/
static void
gst_dvd_sub_dec_merge_title (GstDvdSubDec * dec, GstBuffer * buf)
{
gint y;
gint Y_stride = 4 * dec->in_width;
guchar *buffer = GST_BUFFER_DATA (dec->partialbuf);
gint hl_top, hl_bottom;
gint last_y;
RLE_state state;
GST_DEBUG_OBJECT (dec, "Merging subtitle on frame at time %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
state.id = 0;
state.aligned = 1;
state.next = 0;
state.offset[0] = dec->offset[0];
state.offset[1] = dec->offset[1];
if (dec->current_button) {
hl_top = dec->hl_top;
hl_bottom = dec->hl_bottom;
} else {
hl_top = -1;
hl_bottom = -1;
}
last_y = MIN (dec->bottom, dec->in_height);
y = dec->top;
state.target = GST_BUFFER_DATA (buf) + 4 * dec->left + (y * Y_stride);
/* Now draw scanlines until we hit last_y or end of RLE data */
for (; ((state.offset[1] < dec->data_size + 2) && (y <= last_y)); y++) {
/* Set up to draw the highlight if we're in the right scanlines */
if (y > hl_bottom || y < hl_top) {
state.hl_left = -1;
state.hl_right = -1;
} else {
state.hl_left = dec->hl_left;
state.hl_right = dec->hl_right;
}
gst_draw_rle_line (dec, buffer, &state);
state.target += Y_stride;
/* Realign the RLE state for the next line */
if (!state.aligned)
gst_get_nibble (buffer, &state);
state.id = !state.id;
}
}
static void
gst_send_empty_fill (GstDvdSubDec * dec, GstClockTime ts)
{
if (dec->next_ts < ts) {
GST_LOG_OBJECT (dec, "Sending newsegment update to advance time to %"
GST_TIME_FORMAT, GST_TIME_ARGS (ts));
gst_pad_push_event (dec->srcpad,
gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, ts, -1, ts));
}
dec->next_ts = ts;
}
static GstFlowReturn
gst_send_subtitle_frame (GstDvdSubDec * dec, GstClockTime end_ts)
{
GstFlowReturn flow;
GstBuffer *out_buf;
gint x, y;
g_assert (dec->have_title);
g_assert (dec->next_ts <= end_ts);
/* Check if we need to redraw the output buffer */
if (dec->buf_dirty) {
if (dec->out_buffer) {
gst_buffer_unref (dec->out_buffer);
dec->out_buffer = NULL;
}
flow = gst_pad_alloc_buffer_and_set_caps (dec->srcpad, 0,
4 * dec->in_width * dec->in_height, GST_PAD_CAPS (dec->srcpad),
&out_buf);
if (flow != GST_FLOW_OK) {
GST_DEBUG_OBJECT (dec, "alloc buffer failed: flow = %s",
gst_flow_get_name (flow));
goto out;
}
/* Clear the buffer */
/* FIXME - move this into the buffer rendering code */
for (y = 0; y < dec->in_height; y++) {
guchar *line = GST_BUFFER_DATA (out_buf) + 4 * dec->in_width * y;
for (x = 0; x < dec->in_width; x++) {
line[0] = 0; /* A */
line[1] = 16; /* Y */
line[2] = 128; /* U */
line[3] = 128; /* V */
line += 4;
}
}
/* FIXME: do we really want to honour the forced_display flag
* for subtitles streans? */
if (dec->visible || dec->forced_display) {
gst_dvd_sub_dec_merge_title (dec, out_buf);
}
dec->out_buffer = out_buf;
dec->buf_dirty = FALSE;
}
out_buf = gst_buffer_create_sub (dec->out_buffer, 0,
GST_BUFFER_SIZE (dec->out_buffer));
GST_BUFFER_TIMESTAMP (out_buf) = dec->next_ts;
GST_BUFFER_DURATION (out_buf) = GST_CLOCK_DIFF (dec->next_ts, end_ts);
GST_DEBUG_OBJECT (dec, "Sending subtitle buffer with ts %"
GST_TIME_FORMAT ", dur %" G_GINT64_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (out_buf)),
GST_BUFFER_DURATION (out_buf));
gst_buffer_set_caps (out_buf, GST_PAD_CAPS (dec->srcpad));
flow = gst_pad_push (dec->srcpad, out_buf);
out:
dec->next_ts = end_ts;
return flow;
}
/* Walk time forward, processing any subtitle events as needed. */
static GstFlowReturn
gst_dvd_sub_dec_advance_time (GstDvdSubDec * dec, GstClockTime new_ts)
{
GstFlowReturn ret = GST_FLOW_OK;
GST_LOG_OBJECT (dec, "Advancing time to %" GST_TIME_FORMAT,
GST_TIME_ARGS (new_ts));
if (!dec->have_title) {
gst_send_empty_fill (dec, new_ts);
return ret;
}
while (dec->next_ts < new_ts) {
GstClockTime next_ts = new_ts;
if (GST_CLOCK_TIME_IS_VALID (dec->next_event_ts) &&
dec->next_event_ts < next_ts) {
/* We might need to process the subtitle cmd queue */
next_ts = dec->next_event_ts;
}
/*
* Now, either output a filler or a frame spanning
* dec->next_ts to next_ts
*/
if (dec->visible || dec->forced_display) {
ret = gst_send_subtitle_frame (dec, next_ts);
} else {
gst_send_empty_fill (dec, next_ts);
}
/*
* and then process some subtitle cmds if we need
*/
if (next_ts == dec->next_event_ts)
gst_dvd_sub_dec_parse_subpic (dec);
}
return ret;
}
static GstFlowReturn
gst_dvd_sub_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstDvdSubDec *dec;
guint8 *data;
glong size = 0;
dec = GST_DVD_SUB_DEC (GST_PAD_PARENT (pad));
GST_DEBUG_OBJECT (dec, "Have buffer of size %d, ts %"
GST_TIME_FORMAT ", dur %" G_GINT64_FORMAT, GST_BUFFER_SIZE (buf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), GST_BUFFER_DURATION (buf));
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
if (!GST_CLOCK_TIME_IS_VALID (dec->next_ts)) {
dec->next_ts = GST_BUFFER_TIMESTAMP (buf);
}
/* Move time forward to the start of the new buffer */
ret = gst_dvd_sub_dec_advance_time (dec, GST_BUFFER_TIMESTAMP (buf));
}
if (dec->have_title) {
gst_buffer_unref (dec->partialbuf);
dec->partialbuf = NULL;
dec->have_title = FALSE;
}
GST_DEBUG_OBJECT (dec, "Got subtitle buffer, pts %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
/* deal with partial frame from previous buffer */
if (dec->partialbuf) {
GstBuffer *merge;
merge = gst_buffer_join (dec->partialbuf, buf);
dec->partialbuf = merge;
} else {
dec->partialbuf = buf;
}
data = GST_BUFFER_DATA (dec->partialbuf);
size = GST_BUFFER_SIZE (dec->partialbuf);
if (size > 4) {
dec->packet_size = GST_READ_UINT16_BE (data);
if (dec->packet_size == size) {
GST_LOG_OBJECT (dec, "Subtitle packet size %d, current size %ld",
dec->packet_size, size);
dec->data_size = GST_READ_UINT16_BE (data + 2);
/* Reset parameters for a new subtitle buffer */
dec->parse_pos = data;
dec->forced_display = FALSE;
dec->visible = FALSE;
dec->have_title = TRUE;
dec->next_event_ts = GST_BUFFER_TIMESTAMP (dec->partialbuf);
if (!GST_CLOCK_TIME_IS_VALID (dec->next_event_ts))
dec->next_event_ts = dec->next_ts;
dec->next_event_ts += gst_dvd_sub_dec_get_event_delay (dec);
}
}
return ret;
}
static gboolean
gst_dvd_sub_dec_sink_event (GstPad * pad, GstEvent * event)
{
GstDvdSubDec *dec = GST_DVD_SUB_DEC (gst_pad_get_parent (pad));
gboolean ret = FALSE;
GST_LOG_OBJECT (dec, "%s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_DOWNSTREAM:{
GstClockTime ts = GST_EVENT_TIMESTAMP (event);
if (event->structure != NULL &&
gst_structure_has_name (event->structure, "application/x-gst-dvd")) {
if (GST_CLOCK_TIME_IS_VALID (ts))
gst_dvd_sub_dec_advance_time (dec, ts);
if (gst_dvd_sub_dec_handle_dvd_event (dec, event)) {
/* gst_dvd_sub_dec_advance_time (dec, dec->next_ts + GST_SECOND / 30.0); */
gst_event_unref (event);
ret = TRUE;
break;
}
}
ret = gst_pad_event_default (pad, event);
break;
}
case GST_EVENT_NEWSEGMENT:{
gboolean update;
GstFormat format;
gint64 start, stop, pos;
gst_event_parse_new_segment (event, &update, NULL, &format, &start,
&stop, &pos);
if (update) {
/* update ... advance time */
if (GST_CLOCK_TIME_IS_VALID (pos)) {
GST_DEBUG_OBJECT (dec, "Got segment update, advancing time from %"
GST_TIME_FORMAT " to %" GST_TIME_FORMAT,
GST_TIME_ARGS (dec->next_ts), GST_TIME_ARGS (pos));
gst_dvd_sub_dec_advance_time (dec, pos);
} else {
GST_WARNING_OBJECT (dec, "Got segment update with invalid position");
}
gst_event_unref (event);
ret = TRUE;
} else {
/* not just an update ... */
/* Turn off forced highlight display */
// dec->forced_display = 0;
// dec->current_button = 0;
if (dec->partialbuf) {
gst_buffer_unref (dec->partialbuf);
dec->partialbuf = NULL;
dec->have_title = FALSE;
}
if (GST_CLOCK_TIME_IS_VALID (pos))
dec->next_ts = pos;
else
dec->next_ts = GST_CLOCK_TIME_NONE;
GST_DEBUG_OBJECT (dec, "Got newsegment, new time = %"
GST_TIME_FORMAT, GST_TIME_ARGS (dec->next_ts));
ret = gst_pad_event_default (pad, event);
}
break;
}
case GST_EVENT_FLUSH_STOP:{
/* Turn off forced highlight display */
dec->forced_display = 0;
dec->current_button = 0;
if (dec->partialbuf) {
gst_buffer_unref (dec->partialbuf);
dec->partialbuf = NULL;
dec->have_title = FALSE;
}
ret = gst_pad_event_default (pad, event);
break;
}
default:{
ret = gst_pad_event_default (pad, event);
break;
}
}
gst_object_unref (dec);
return ret;
}
static gboolean
gst_dvd_sub_dec_handle_dvd_event (GstDvdSubDec * dec, GstEvent * event)
{
GstStructure *structure;
const gchar *event_name;
structure = (GstStructure *) gst_event_get_structure (event);
if (structure == NULL)
goto not_handled;
event_name = gst_structure_get_string (structure, "event");
GST_LOG_OBJECT (dec, "DVD event %s with timestamp %lld on sub pad",
GST_STR_NULL (event_name), GST_EVENT_TIMESTAMP (event));
if (event_name == NULL)
goto not_handled;
if (strcmp (event_name, "dvd-spu-highlight") == 0) {
gint button;
gint palette, sx, sy, ex, ey;
gint i;
/* Details for the highlight region to display */
if (!gst_structure_get_int (structure, "button", &button) ||
!gst_structure_get_int (structure, "palette", &palette) ||
!gst_structure_get_int (structure, "sx", &sx) ||
!gst_structure_get_int (structure, "sy", &sy) ||
!gst_structure_get_int (structure, "ex", &ex) ||
!gst_structure_get_int (structure, "ey", &ey)) {
GST_ERROR_OBJECT (dec, "Invalid dvd-spu-highlight event received");
return TRUE;
}
dec->current_button = button;
dec->hl_left = sx;
dec->hl_top = sy;
dec->hl_right = ex;
dec->hl_bottom = ey;
for (i = 0; i < 4; i++) {
dec->menu_alpha[i] = ((guint32) (palette) >> (i * 4)) & 0x0f;
dec->menu_index[i] = ((guint32) (palette) >> (16 + (i * 4))) & 0x0f;
}
GST_DEBUG_OBJECT (dec, "New button activated highlight=(%d,%d) to (%d,%d) "
"palette 0x%x", sx, sy, ex, ey, palette);
gst_setup_palette (dec);
dec->buf_dirty = TRUE;
} else if (strcmp (event_name, "dvd-spu-clut-change") == 0) {
/* Take a copy of the colour table */
gchar name[16];
int i;
gint value;
GST_LOG_OBJECT (dec, "New colour table received");
for (i = 0; i < 16; i++) {
g_snprintf (name, sizeof (name), "clut%02d", i);
if (!gst_structure_get_int (structure, name, &value)) {
GST_ERROR_OBJECT (dec, "dvd-spu-clut-change event did not "
"contain %s field", name);
break;
}
dec->current_clut[i] = (guint32) (value);
}
gst_setup_palette (dec);
dec->buf_dirty = TRUE;
} else if (strcmp (event_name, "dvd-spu-stream-change") == 0
|| strcmp (event_name, "dvd-spu-reset-highlight") == 0) {
/* Turn off forced highlight display */
dec->current_button = 0;
GST_LOG_OBJECT (dec, "Clearing button state");
dec->buf_dirty = TRUE;
} else if (strcmp (event_name, "dvd-spu-still-frame") == 0) {
/* Handle a still frame */
GST_LOG_OBJECT (dec, "Received still frame notification");
} else {
goto not_handled;
}
return TRUE;
not_handled:
{
/* Ignore all other unknown events */
GST_LOG_OBJECT (dec, "Ignoring other custom event %" GST_PTR_FORMAT,
structure);
return FALSE;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "dvdsubdec", GST_RANK_NONE,
GST_TYPE_DVD_SUB_DEC) ||
!gst_element_register (plugin, "dvdsubparse", GST_RANK_NONE,
GST_TYPE_DVD_SUB_PARSE)) {
return FALSE;
}
GST_DEBUG_CATEGORY_INIT (gst_dvd_sub_dec_debug, "dvdsubdec", 0,
"DVD subtitle decoder");
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"dvdsub",
"DVD subtitle parser and decoder", plugin_init,
VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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