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gstreamer/gst/dvdsub/gstdvdsubdec.c
Sebastian Dröge 101e8a024f dvdsubdec: Rearrange buffer allocation and pushing code a bit 
This makes the code easier to read, doesn't store every buffer
in the instance until the next buffer is to be drawn and
fixes an unitialized variable compiler warning.
2011-03-15 11:02:42 +01:00

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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 gboolean gst_dvd_sub_dec_sink_setcaps (GstPad * pad, GstCaps * caps);
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; "
"video/x-raw-rgb, "
"width = (int) 720, height = (int) 576, framerate = (fraction) 0/1, "
"bpp = (int) 32, endianness = (int) 4321, red_mask = (int) 16711680, "
"green_mask = (int) 65280, blue_mask = (int) 255, "
" alpha_mask = (int) -16777216, depth = (int) 32")
);
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;
gobject_class = (GObjectClass *) 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);
gst_pad_set_setcaps_function (dec->sinkpad, gst_dvd_sub_dec_sink_setcaps);
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_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;
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->buf_dirty = TRUE;
dec->use_ARGB = FALSE;
}
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->top = ((buf[4] & 0x3f) << 4) | ((buf[5] & 0xe0) >> 4);
dec->left = ((buf[1] & 0x3f) << 4) | ((buf[2] & 0xf0) >> 4);
dec->right = ((buf[2] & 0x03) << 8) | buf[3];
dec->bottom = ((buf[5] & 0x03) << 8) | buf[6];
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 %u, delay %g secs (%d ticks)",
(guint) (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;
Color_val *target_yuv = dec->palette_cache_yuv;
Color_val *target2_yuv = dec->hl_palette_cache_yuv;
Color_val *target_rgb = dec->palette_cache_rgb;
Color_val *target2_rgb = dec->hl_palette_cache_rgb;
for (i = 0; i < 4; i++, target2_yuv++, target_yuv++) {
col = dec->current_clut[dec->subtitle_index[i]];
target_yuv->Y_R = (col >> 16) & 0xff;
target_yuv->V_B = (col >> 8) & 0xff;
target_yuv->U_G = col & 0xff;
target_yuv->A = dec->subtitle_alpha[i] * 0xff / 0xf;
col = dec->current_clut[dec->menu_index[i]];
target2_yuv->Y_R = (col >> 16) & 0xff;
target2_yuv->V_B = (col >> 8) & 0xff;
target2_yuv->U_G = col & 0xff;
target2_yuv->A = dec->menu_alpha[i] * 0xff / 0xf;
/* If ARGB flag set, then convert YUV palette to RGB */
/* Using integer aritmetic */
if (dec->use_ARGB) {
guchar C = target_yuv->Y_R - 16;
guchar D = target_yuv->U_G - 128;
guchar E = target_yuv->V_B - 128;
target_rgb->Y_R = CLAMP (((298 * C + 409 * E + 128) >> 8), 0, 255);
target_rgb->U_G =
CLAMP (((298 * C - 100 * D - 128 * E + 128) >> 8), 0, 255);
target_rgb->V_B = CLAMP (((298 * C + 516 * D + 128) >> 8), 0, 255);
target_rgb->A = target_yuv->A;
C = target2_yuv->Y_R - 16;
D = target2_yuv->U_G - 128;
E = target2_yuv->V_B - 128;
target2_rgb->Y_R = CLAMP (((298 * C + 409 * E + 128) >> 8), 0, 255);
target2_rgb->U_G =
CLAMP (((298 * C - 100 * D - 128 * E + 128) >> 8), 0, 255);
target2_rgb->V_B = CLAMP (((298 * C + 516 * D + 128) >> 8), 0, 255);
target2_rgb->A = target2_yuv->A;
}
target_rgb++;
target2_rgb++;
}
}
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 { \
gint i = 0; \
if ((c)->A) { \
for (i = 0; i < (len); i++) { \
*(target)++ = (c)->A; \
*(target)++ = (c)->Y_R; \
*(target)++ = (c)->U_G; \
*(target)++ = (c)->V_B; \
} \
} else { \
(target) += 4 * (len); \
} \
} G_STMT_END
/*
* This function steps over each run-length segment, drawing
* into the YUVA/ARGB 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 Color_val *colour_entry;
code = gst_get_rle_code (buffer, state);
length = code >> 2;
colourid = code & 3;
if (dec->use_ARGB)
colour_entry = dec->palette_cache_rgb + colourid;
else
colour_entry = dec->palette_cache_yuv + 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 Color_val *hl_colour;
if (dec->use_ARGB)
hl_colour = dec->hl_palette_cache_rgb + colourid;
else
hl_colour = dec->hl_palette_cache_yuv + 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];
/* center the image when display rectangle exceeds the video width */
if (dec->in_width <= dec->right) {
gint left, disp_width;
disp_width = dec->right - dec->left + 1;
left = (dec->in_width - disp_width) / 2;
dec->left = left;
dec->right = left + disp_width - 1;
/* if it clips to the right, shift it left, but only till zero */
if (dec->right >= dec->in_width) {
gint shift = dec->right - dec->in_width - 1;
if (shift > dec->left)
shift = dec->left;
dec->left -= shift;
dec->right -= shift;
}
GST_DEBUG_OBJECT (dec, "clipping width to %d,%d",
dec->left, dec->in_width - 1);
}
/* for the height, bring it up till it fits as well as it can. We
* assume the picture is in the lower part. We should better check where it
* is and do something more clever. */
if (dec->in_height <= dec->bottom) {
/* shift it up, but only till zero */
gint shift = dec->bottom - dec->in_height - 1;
if (shift > dec->top)
shift = dec->top;
dec->top -= shift;
dec->bottom -= shift;
/* start on even line */
if (dec->top & 1) {
dec->top--;
dec->bottom--;
}
GST_DEBUG_OBJECT (dec, "clipping height to %d,%d",
dec->top, dec->in_height - 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) {
flow = GST_FLOW_OK;
goto out;
}
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 */
if (!dec->use_ARGB) {
line[1] = 16; /* Y */
line[2] = 128; /* U */
line[3] = 128; /* V */
} else {
line[1] = 0; /* R */
line[2] = 0; /* G */
line[3] = 0; /* B */
}
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->buf_dirty = FALSE;
GST_BUFFER_TIMESTAMP (out_buf) = dec->next_ts;
if (GST_CLOCK_TIME_IS_VALID (dec->next_event_ts)) {
GST_BUFFER_DURATION (out_buf) = GST_CLOCK_DIFF (dec->next_ts,
dec->next_event_ts);
} else {
GST_BUFFER_DURATION (out_buf) = GST_CLOCK_TIME_NONE;
}
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_setcaps (GstPad * pad, GstCaps * caps)
{
GstDvdSubDec *dec = GST_DVD_SUB_DEC (gst_pad_get_parent (pad));
gboolean ret = FALSE;
guint32 fourcc = GST_MAKE_FOURCC ('A', 'Y', 'U', 'V');
GstCaps *out_caps = NULL, *peer_caps = NULL;
GST_DEBUG_OBJECT (dec, "setcaps called with %" GST_PTR_FORMAT, caps);
dec->out_fourcc = fourcc;
out_caps = gst_caps_new_simple ("video/x-raw-yuv",
"width", G_TYPE_INT, dec->in_width,
"height", G_TYPE_INT, dec->in_height,
"format", GST_TYPE_FOURCC, dec->out_fourcc,
"framerate", GST_TYPE_FRACTION, 0, 1, NULL);
peer_caps = gst_pad_get_allowed_caps (dec->srcpad);
if (G_LIKELY (peer_caps)) {
guint i = 0, n = 0;
n = gst_caps_get_size (peer_caps);
GST_DEBUG_OBJECT (dec, "peer allowed caps (%u structure(s)) are %"
GST_PTR_FORMAT, n, peer_caps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (peer_caps, i);
/* Check if the peer pad support ARGB format, if yes change caps */
if (gst_structure_has_name (s, "video/x-raw-rgb") &&
gst_structure_has_field (s, "alpha_mask")) {
gst_caps_unref (out_caps);
GST_DEBUG_OBJECT (dec, "trying with fourcc %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fourcc));
out_caps = gst_caps_new_simple ("video/x-raw-rgb",
"width", G_TYPE_INT, dec->in_width,
"height", G_TYPE_INT, dec->in_height,
"framerate", GST_TYPE_FRACTION, 0, 1,
"bpp", G_TYPE_INT, 32,
"depth", G_TYPE_INT, 32,
"red_mask", G_TYPE_INT, 16711680,
"green_mask", G_TYPE_INT, 65280,
"blue_mask", G_TYPE_INT, 255,
"alpha_mask", G_TYPE_INT, -16777216,
"endianness", G_TYPE_INT, G_BIG_ENDIAN, NULL);
if (gst_pad_peer_accept_caps (dec->srcpad, out_caps)) {
GST_DEBUG_OBJECT (dec, "peer accepted format %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fourcc));
/* If ARGB format then set the flag */
dec->use_ARGB = TRUE;
break;
}
}
}
gst_caps_unref (peer_caps);
}
GST_DEBUG_OBJECT (dec, "setting caps downstream to %" GST_PTR_FORMAT,
out_caps);
if (gst_pad_set_caps (dec->srcpad, out_caps)) {
dec->out_fourcc = fourcc;
} else {
GST_WARNING_OBJECT (dec, "failed setting downstream caps");
gst_caps_unref (out_caps);
goto beach;
}
gst_caps_unref (out_caps);
ret = TRUE;
beach:
gst_object_unref (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 %" G_GINT64_FORMAT " 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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