static gboolean
parse_exif_tag_header (GstByteReader * reader, gint byte_order,
GstExifTagData * _tagdata)
{
g_assert (_tagdata);
/* read the fields */
if (byte_order == G_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint16_le (reader, &_tagdata->tag) ||
!gst_byte_reader_get_uint16_le (reader, &_tagdata->tag_type) ||
!gst_byte_reader_get_uint32_le (reader, &_tagdata->count) ||
!gst_byte_reader_get_data (reader, 4, &_tagdata->offset_as_data)) {
return FALSE;
}
_tagdata->offset = GST_READ_UINT32_LE (_tagdata->offset_as_data);
} else {
if (!gst_byte_reader_get_uint16_be (reader, &_tagdata->tag) ||
!gst_byte_reader_get_uint16_be (reader, &_tagdata->tag_type) ||
!gst_byte_reader_get_uint32_be (reader, &_tagdata->count) ||
!gst_byte_reader_get_data (reader, 4, &_tagdata->offset_as_data)) {
return FALSE;
}
_tagdata->offset = GST_READ_UINT32_BE (_tagdata->offset_as_data);
}
return TRUE;
}
/**
* gst_tag_list_from_exif_buffer_with_tiff_header:
* @buffer: The exif buffer
*
* Parses the exif tags starting with a tiff header structure.
*
* Returns: The taglist
*
* Since: 0.10.30
*/
GstTagList *
gst_tag_list_from_exif_buffer_with_tiff_header (const GstBuffer * buffer)
{
GstByteReader reader;
guint16 fortytwo = 42;
guint16 endianness = 0;
guint32 offset;
GstTagList *taglist = NULL;
GstBuffer *subbuffer;
GST_LOG ("Parsing exif tags with tiff header of size %u",
GST_BUFFER_SIZE (buffer));
gst_byte_reader_init_from_buffer (&reader, buffer);
GST_LOG ("Parsing the tiff header");
if (!gst_byte_reader_get_uint16_be (&reader, &endianness)) {
goto byte_reader_fail;
}
if (endianness == TIFF_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint16_le (&reader, &fortytwo) ||
!gst_byte_reader_get_uint32_le (&reader, &offset))
goto byte_reader_fail;
} else if (endianness == TIFF_BIG_ENDIAN) {
if (!gst_byte_reader_get_uint16_be (&reader, &fortytwo) ||
!gst_byte_reader_get_uint32_be (&reader, &offset))
goto byte_reader_fail;
} else {
GST_WARNING ("Invalid endianness number %u", endianness);
return NULL;
}
if (fortytwo != 42) {
GST_WARNING ("Invalid magic number %u, should be 42", fortytwo);
return NULL;
}
subbuffer = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buffer) -
(TIFF_HEADER_SIZE - 2));
memcpy (GST_BUFFER_DATA (subbuffer),
GST_BUFFER_DATA (buffer) + TIFF_HEADER_SIZE,
GST_BUFFER_SIZE (buffer) - TIFF_HEADER_SIZE);
taglist = gst_tag_list_from_exif_buffer (subbuffer,
endianness == TIFF_LITTLE_ENDIAN ? G_LITTLE_ENDIAN : G_BIG_ENDIAN, 8);
gst_buffer_unref (subbuffer);
return taglist;
byte_reader_fail:
{
GST_WARNING ("Failed to read values from buffer");
return NULL;
}
}
static gboolean
flx_decode_color (GstFlxDec * flxdec, GstByteReader * reader,
GstByteWriter * writer, gint scale)
{
guint8 count, indx;
guint16 packs;
if (!gst_byte_reader_get_uint16_le (reader, &packs))
goto error;
indx = 0;
GST_LOG ("GstFlxDec: cmap packs: %d", (guint) packs);
while (packs--) {
const guint8 *data;
guint16 actual_count;
/* color map index + skip count */
if (!gst_byte_reader_get_uint8 (reader, &indx))
goto error;
/* number of rgb triplets */
if (!gst_byte_reader_get_uint8 (reader, &count))
goto error;
actual_count = count == 0 ? 256 : count;
if (!gst_byte_reader_get_data (reader, count * 3, &data))
goto error;
GST_LOG_OBJECT (flxdec, "cmap count: %d (indx: %d)", actual_count, indx);
flx_set_palette_vector (flxdec->converter, indx, actual_count,
(guchar *) data, scale);
}
return TRUE;
error:
GST_ERROR_OBJECT (flxdec, "Error decoding color palette");
return FALSE;
}
static gboolean
parse_exif_ifd (GstExifReader * exif_reader, gint buf_offset,
const GstExifTagMatch * tag_map)
{
GstByteReader reader;
guint16 entries = 0;
guint16 i;
g_return_val_if_fail (exif_reader->byte_order == G_LITTLE_ENDIAN
|| exif_reader->byte_order == G_BIG_ENDIAN, FALSE);
gst_byte_reader_init_from_buffer (&reader, exif_reader->buffer);
if (!gst_byte_reader_set_pos (&reader, buf_offset)) {
GST_WARNING ("Buffer offset invalid when parsing exif ifd");
return FALSE;
}
/* read the IFD entries number */
if (exif_reader->byte_order == G_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint16_le (&reader, &entries))
goto read_error;
} else {
if (!gst_byte_reader_get_uint16_be (&reader, &entries))
goto read_error;
}
GST_DEBUG ("Read number of entries: %u", entries);
/* iterate over the buffer and find the tags and stuff */
for (i = 0; i < entries; i++) {
GstExifTagData tagdata;
gint map_index;
GST_LOG ("Reading entry: %u", i);
if (!parse_exif_tag_header (&reader, exif_reader->byte_order, &tagdata))
goto read_error;
GST_DEBUG ("Parsed tag: id 0x%x, type %u, count %u, offset %u (0x%x)",
tagdata.tag, tagdata.tag_type, tagdata.count, tagdata.offset,
tagdata.offset);
map_index = exif_tag_map_find_reverse (tagdata.tag, tag_map, TRUE);
if (map_index == -1) {
GST_WARNING ("Unmapped exif tag: 0x%x", tagdata.tag);
continue;
}
/* inner ifd tags handling */
if (tagdata.tag == EXIF_GPS_IFD_TAG) {
i += parse_exif_ifd (exif_reader,
tagdata.offset - exif_reader->base_offset, tag_map_gps);
continue;
}
/* tags that need specialized deserialization */
if (tag_map[map_index].deserialize) {
i += tag_map[map_index].deserialize (exif_reader, &reader,
&tag_map[map_index], &tagdata);
continue;
}
switch (tagdata.tag_type) {
case EXIF_TYPE_ASCII:
parse_exif_ascii_tag (exif_reader, tag_map[map_index].gst_tag,
tagdata.count, tagdata.offset, tagdata.offset_as_data);
break;
case EXIF_TYPE_RATIONAL:
parse_exif_rational_tag (exif_reader, tag_map[map_index].gst_tag,
tagdata.count, tagdata.offset, 1);
break;
default:
GST_WARNING ("Unhandled tag type: %u", tagdata.tag_type);
break;
}
}
return TRUE;
read_error:
{
GST_WARNING ("Failed to parse the exif ifd");
return FALSE;
}
}
static void
gst_exif_tag_rewrite_offsets (GstExifWriter * writer, guint32 base_offset)
{
guint32 offset;
GST_LOG ("Rewriting tag entries offsets");
offset = gst_byte_writer_get_size (&writer->tagwriter);
while (gst_byte_writer_get_pos (&writer->tagwriter) <
gst_byte_writer_get_size (&writer->tagwriter)) {
guint16 type = 0;
guint32 cur_offset = 0;
GstByteReader *reader;
gint byte_size = 0;
guint32 count = 0;
guint16 tag_id = 0;
reader = (GstByteReader *) & writer->tagwriter;
/* read the type */
if (writer->byte_order == G_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint16_le (reader, &tag_id))
break;
if (!gst_byte_reader_get_uint16_le (reader, &type))
break;
if (!gst_byte_reader_get_uint32_le (reader, &count))
break;
} else {
if (!gst_byte_reader_get_uint16_be (reader, &tag_id))
break;
if (!gst_byte_reader_get_uint16_be (reader, &type))
break;
if (!gst_byte_reader_get_uint32_be (reader, &count))
break;
}
switch (type) {
case EXIF_TYPE_BYTE:
case EXIF_TYPE_ASCII:
case EXIF_TYPE_UNDEFINED:
byte_size = count;
break;
case EXIF_TYPE_SHORT:
byte_size = count * 2; /* 2 bytes */
break;
case EXIF_TYPE_LONG:
case EXIF_TYPE_SLONG:
byte_size = count * 4; /* 4 bytes */
break;
case EXIF_TYPE_RATIONAL:
case EXIF_TYPE_SRATIONAL:
byte_size = count * 8; /* 8 bytes */
break;
default:
g_assert_not_reached ();
break;
}
/* adjust the offset if needed */
if (byte_size > 4 || tag_id == EXIF_GPS_IFD_TAG) {
if (writer->byte_order == G_LITTLE_ENDIAN) {
if (gst_byte_reader_peek_uint32_le (reader, &cur_offset)) {
gst_byte_writer_put_uint32_le (&writer->tagwriter,
cur_offset + offset + base_offset);
}
} else {
if (gst_byte_reader_peek_uint32_be (reader, &cur_offset)) {
gst_byte_writer_put_uint32_be (&writer->tagwriter,
cur_offset + offset + base_offset);
}
}
GST_DEBUG ("Rewriting tag offset from %u to (%u + %u + %u) %u",
cur_offset, cur_offset, offset, base_offset,
cur_offset + offset + base_offset);
} else {
gst_byte_reader_skip (reader, 4);
GST_DEBUG ("No need to rewrite tag offset");
}
}
}
static GstFlowReturn
gst_flxdec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstByteReader reader;
GstBuffer *input;
GstMapInfo map_info;
GstCaps *caps;
guint available;
GstFlowReturn res = GST_FLOW_OK;
GstFlxDec *flxdec;
FlxHeader *flxh;
g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR);
flxdec = (GstFlxDec *) parent;
g_return_val_if_fail (flxdec != NULL, GST_FLOW_ERROR);
gst_adapter_push (flxdec->adapter, buf);
available = gst_adapter_available (flxdec->adapter);
input = gst_adapter_get_buffer (flxdec->adapter, available);
if (!gst_buffer_map (input, &map_info, GST_MAP_READ)) {
GST_ELEMENT_ERROR (flxdec, STREAM, DECODE,
("%s", "Failed to map buffer"), (NULL));
goto error;
}
gst_byte_reader_init (&reader, map_info.data, map_info.size);
if (flxdec->state == GST_FLXDEC_READ_HEADER) {
if (available >= FlxHeaderSize) {
GstByteReader header;
GstCaps *templ;
if (!gst_byte_reader_get_sub_reader (&reader, &header, FlxHeaderSize)) {
GST_ELEMENT_ERROR (flxdec, STREAM, DECODE,
("%s", "Could not read header"), (NULL));
goto unmap_input_error;
}
gst_adapter_flush (flxdec->adapter, FlxHeaderSize);
available -= FlxHeaderSize;
if (!_read_flx_header (flxdec, &header, &flxdec->hdr)) {
GST_ELEMENT_ERROR (flxdec, STREAM, DECODE,
("%s", "Failed to parse header"), (NULL));
goto unmap_input_error;
}
flxh = &flxdec->hdr;
/* check header */
if (flxh->type != FLX_MAGICHDR_FLI &&
flxh->type != FLX_MAGICHDR_FLC && flxh->type != FLX_MAGICHDR_FLX) {
GST_ELEMENT_ERROR (flxdec, STREAM, WRONG_TYPE, (NULL),
("not a flx file (type %x)", flxh->type));
goto unmap_input_error;
}
GST_INFO_OBJECT (flxdec, "size : %d", flxh->size);
GST_INFO_OBJECT (flxdec, "frames : %d", flxh->frames);
GST_INFO_OBJECT (flxdec, "width : %d", flxh->width);
GST_INFO_OBJECT (flxdec, "height : %d", flxh->height);
GST_INFO_OBJECT (flxdec, "depth : %d", flxh->depth);
GST_INFO_OBJECT (flxdec, "speed : %d", flxh->speed);
flxdec->next_time = 0;
if (flxh->type == FLX_MAGICHDR_FLI) {
flxdec->frame_time = JIFFIE * flxh->speed;
} else if (flxh->speed == 0) {
flxdec->frame_time = GST_SECOND / 70;
} else {
flxdec->frame_time = flxh->speed * GST_MSECOND;
}
flxdec->duration = flxh->frames * flxdec->frame_time;
GST_LOG ("duration : %" GST_TIME_FORMAT,
GST_TIME_ARGS (flxdec->duration));
templ = gst_pad_get_pad_template_caps (flxdec->srcpad);
caps = gst_caps_copy (templ);
gst_caps_unref (templ);
gst_caps_set_simple (caps,
"width", G_TYPE_INT, flxh->width,
"height", G_TYPE_INT, flxh->height,
"framerate", GST_TYPE_FRACTION, (gint) GST_MSECOND,
(gint) flxdec->frame_time / 1000, NULL);
gst_pad_set_caps (flxdec->srcpad, caps);
gst_caps_unref (caps);
if (flxdec->need_segment) {
gst_pad_push_event (flxdec->srcpad,
gst_event_new_segment (&flxdec->segment));
flxdec->need_segment = FALSE;
}
/* zero means 8 */
if (flxh->depth == 0)
flxh->depth = 8;
if (flxh->depth != 8) {
GST_ELEMENT_ERROR (flxdec, STREAM, WRONG_TYPE,
("%s", "Don't know how to decode non 8 bit depth streams"), (NULL));
goto unmap_input_error;
}
flxdec->converter =
flx_colorspace_converter_new (flxh->width, flxh->height);
if (flxh->type == FLX_MAGICHDR_FLC || flxh->type == FLX_MAGICHDR_FLX) {
GST_INFO_OBJECT (flxdec, "(FLC) aspect_dx : %d", flxh->aspect_dx);
GST_INFO_OBJECT (flxdec, "(FLC) aspect_dy : %d", flxh->aspect_dy);
GST_INFO_OBJECT (flxdec, "(FLC) oframe1 : 0x%08x", flxh->oframe1);
GST_INFO_OBJECT (flxdec, "(FLC) oframe2 : 0x%08x", flxh->oframe2);
}
flxdec->size = ((guint) flxh->width * (guint) flxh->height);
if (flxdec->size >= G_MAXSIZE / 4) {
GST_ELEMENT_ERROR (flxdec, STREAM, DECODE,
("%s", "Cannot allocate required memory"), (NULL));
goto unmap_input_error;
}
/* create delta and output frame */
flxdec->frame_data = g_malloc0 (flxdec->size);
flxdec->delta_data = g_malloc0 (flxdec->size);
flxdec->state = GST_FLXDEC_PLAYING;
}
} else if (flxdec->state == GST_FLXDEC_PLAYING) {
GstBuffer *out;
/* while we have enough data in the adapter */
while (available >= FlxFrameChunkSize && res == GST_FLOW_OK) {
guint32 size;
guint16 type;
if (!gst_byte_reader_get_uint32_le (&reader, &size))
goto parse_error;
if (available < size)
goto need_more_data;
available -= size;
gst_adapter_flush (flxdec->adapter, size);
if (!gst_byte_reader_get_uint16_le (&reader, &type))
goto parse_error;
switch (type) {
case FLX_FRAME_TYPE:{
GstByteReader chunks;
GstByteWriter writer;
guint16 n_chunks;
GstMapInfo map;
GST_LOG_OBJECT (flxdec, "Have frame type 0x%02x of size %d", type,
size);
if (!gst_byte_reader_get_sub_reader (&reader, &chunks,
size - FlxFrameChunkSize))
goto parse_error;
if (!gst_byte_reader_get_uint16_le (&chunks, &n_chunks))
goto parse_error;
GST_LOG_OBJECT (flxdec, "Have %d chunks", n_chunks);
if (n_chunks == 0)
break;
if (!gst_byte_reader_skip (&chunks, 8)) /* reserved */
goto parse_error;
gst_byte_writer_init_with_data (&writer, flxdec->frame_data,
flxdec->size, TRUE);
/* decode chunks */
if (!flx_decode_chunks (flxdec, n_chunks, &chunks, &writer)) {
GST_ELEMENT_ERROR (flxdec, STREAM, DECODE,
("%s", "Could not decode chunk"), NULL);
goto unmap_input_error;
}
gst_byte_writer_reset (&writer);
/* save copy of the current frame for possible delta. */
memcpy (flxdec->delta_data, flxdec->frame_data, flxdec->size);
out = gst_buffer_new_and_alloc (flxdec->size * 4);
if (!gst_buffer_map (out, &map, GST_MAP_WRITE)) {
GST_ELEMENT_ERROR (flxdec, STREAM, DECODE,
("%s", "Could not map output buffer"), NULL);
gst_buffer_unref (out);
goto unmap_input_error;
}
/* convert current frame. */
flx_colorspace_convert (flxdec->converter, flxdec->frame_data,
map.data);
gst_buffer_unmap (out, &map);
GST_BUFFER_TIMESTAMP (out) = flxdec->next_time;
flxdec->next_time += flxdec->frame_time;
res = gst_pad_push (flxdec->srcpad, out);
break;
}
default:
GST_DEBUG_OBJECT (flxdec, "Unknown frame type 0x%02x, skipping %d",
type, size);
if (!gst_byte_reader_skip (&reader, size - FlxFrameChunkSize))
goto parse_error;
break;
}
}
}
need_more_data:
gst_buffer_unmap (input, &map_info);
gst_buffer_unref (input);
return res;
/* ERRORS */
parse_error:
GST_ELEMENT_ERROR (flxdec, STREAM, DECODE,
("%s", "Failed to parse stream"), (NULL));
unmap_input_error:
gst_buffer_unmap (input, &map_info);
error:
gst_buffer_unref (input);
return GST_FLOW_ERROR;
}
static gboolean
_read_flx_header (GstFlxDec * flxdec, GstByteReader * reader, FlxHeader * flxh)
{
memset (flxh, 0, sizeof (*flxh));
if (!gst_byte_reader_get_uint32_le (reader, &flxh->size))
goto error;
if (flxh->size < FlxHeaderSize) {
GST_ERROR_OBJECT (flxdec, "Invalid file size in the header");
return FALSE;
}
if (!gst_byte_reader_get_uint16_le (reader, &flxh->type))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->frames))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->width))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->height))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->depth))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->flags))
goto error;
if (!gst_byte_reader_get_uint32_le (reader, &flxh->speed))
goto error;
if (!gst_byte_reader_skip (reader, 2)) /* reserved */
goto error;
/* FLC */
if (!gst_byte_reader_get_uint32_le (reader, &flxh->created))
goto error;
if (!gst_byte_reader_get_uint32_le (reader, &flxh->creator))
goto error;
if (!gst_byte_reader_get_uint32_le (reader, &flxh->updated))
goto error;
if (!gst_byte_reader_get_uint32_le (reader, &flxh->updater))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->aspect_dx))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->aspect_dy))
goto error;
/* EGI */
if (!gst_byte_reader_get_uint16_le (reader, &flxh->ext_flags))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->keyframes))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->totalframes))
goto error;
if (!gst_byte_reader_get_uint32_le (reader, &flxh->req_memory))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->max_regions))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &flxh->transp_num))
goto error;
if (!gst_byte_reader_skip (reader, 24)) /* reserved */
goto error;
/* FLC */
if (!gst_byte_reader_get_uint32_le (reader, &flxh->oframe1))
goto error;
if (!gst_byte_reader_get_uint32_le (reader, &flxh->oframe2))
goto error;
if (!gst_byte_reader_skip (reader, 40)) /* reserved */
goto error;
return TRUE;
error:
GST_ERROR_OBJECT (flxdec, "Error reading file header");
return FALSE;
}
static gboolean
flx_decode_delta_flc (GstFlxDec * flxdec, GstByteReader * reader,
GstByteWriter * writer)
{
guint16 lines, start_l;
g_return_val_if_fail (flxdec != NULL, FALSE);
g_return_val_if_fail (flxdec->delta_data != NULL, FALSE);
/* use last frame for delta */
if (!gst_byte_writer_put_data (writer, flxdec->delta_data, flxdec->size))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &lines))
goto error;
if (lines > flxdec->hdr.height) {
GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. too many lines.");
return FALSE;
}
start_l = lines;
while (lines) {
guint16 opcode;
if (!gst_byte_writer_set_pos (writer,
flxdec->hdr.width * (start_l - lines)))
goto error;
/* process opcode(s) */
while (TRUE) {
if (!gst_byte_reader_get_uint16_le (reader, &opcode))
goto error;
if ((opcode & 0xc000) == 0)
break;
if ((opcode & 0xc000) == 0xc000) {
/* line skip count */
gulong skip = (0x10000 - opcode);
if (skip > flxdec->hdr.height) {
GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. "
"skip line count too big.");
return FALSE;
}
start_l += skip;
if (!gst_byte_writer_set_pos (writer,
gst_byte_writer_get_pos (writer) + flxdec->hdr.width * skip))
goto error;
} else {
/* last pixel */
if (!gst_byte_writer_set_pos (writer,
gst_byte_writer_get_pos (writer) + flxdec->hdr.width))
goto error;
if (!gst_byte_writer_put_uint8 (writer, opcode & 0xff))
goto error;
}
}
/* last opcode is the packet count */
GST_LOG_OBJECT (flxdec, "have %d packets", opcode);
while (opcode--) {
/* skip count */
guint8 skip;
gint8 count;
if (!gst_byte_reader_get_uint8 (reader, &skip))
goto error;
if (!gst_byte_writer_set_pos (writer,
gst_byte_writer_get_pos (writer) + skip))
goto error;
/* RLE count */
if (!gst_byte_reader_get_int8 (reader, &count))
goto error;
if (count < 0) {
guint16 x;
/* replicate word run */
count = ABS (count);
GST_LOG_OBJECT (flxdec, "have replicate run of size %d at offset %d",
count, skip);
if (skip + count > flxdec->hdr.width) {
GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. "
"line too long.");
return FALSE;
}
if (!gst_byte_reader_get_uint16_le (reader, &x))
goto error;
while (count--) {
if (!gst_byte_writer_put_uint16_le (writer, x)) {
goto error;
}
}
} else {
GST_LOG_OBJECT (flxdec, "have literal run of size %d at offset %d",
count, skip);
if (skip + count > flxdec->hdr.width) {
GST_ERROR_OBJECT (flxdec, "Invalid FLC packet detected. "
"line too long.");
return FALSE;
}
while (count--) {
guint16 x;
if (!gst_byte_reader_get_uint16_le (reader, &x))
goto error;
if (!gst_byte_writer_put_uint16_le (writer, x))
goto error;
}
}
}
lines--;
}
return TRUE;
error:
GST_ERROR_OBJECT (flxdec, "Failed to decode FLI packet");
return FALSE;
}
static gboolean
flx_decode_delta_fli (GstFlxDec * flxdec, GstByteReader * reader,
GstByteWriter * writer)
{
guint16 start_line, lines;
guint line_start_i;
g_return_val_if_fail (flxdec != NULL, FALSE);
g_return_val_if_fail (flxdec->delta_data != NULL, FALSE);
/* use last frame for delta */
if (!gst_byte_writer_put_data (writer, flxdec->delta_data, flxdec->size))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &start_line))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &lines))
goto error;
GST_LOG_OBJECT (flxdec, "height %d start line %d line count %d",
flxdec->hdr.height, start_line, lines);
if (start_line + lines > flxdec->hdr.height) {
GST_ERROR_OBJECT (flxdec, "Invalid FLI packet detected. too many lines.");
return FALSE;
}
line_start_i = flxdec->hdr.width * start_line;
if (!gst_byte_writer_set_pos (writer, line_start_i))
goto error;
while (lines--) {
guint8 packets;
/* packet count */
if (!gst_byte_reader_get_uint8 (reader, &packets))
goto error;
GST_LOG_OBJECT (flxdec, "have %d packets", packets);
while (packets--) {
/* skip count */
guint8 skip;
gint8 count;
if (!gst_byte_reader_get_uint8 (reader, &skip))
goto error;
/* skip bytes */
if (!gst_byte_writer_set_pos (writer,
gst_byte_writer_get_pos (writer) + skip))
goto error;
/* RLE count */
if (!gst_byte_reader_get_int8 (reader, &count))
goto error;
if (count < 0) {
guint8 x;
/* literal run */
count = ABS (count);
GST_LOG_OBJECT (flxdec, "have literal run of size %d at offset %d",
count, skip);
if (skip + count > flxdec->hdr.width) {
GST_ERROR_OBJECT (flxdec, "Invalid FLI packet detected. "
"line too long.");
return FALSE;
}
if (!gst_byte_reader_get_uint8 (reader, &x))
goto error;
if (!gst_byte_writer_fill (writer, x, count))
goto error;
} else {
const guint8 *data;
GST_LOG_OBJECT (flxdec, "have replicate run of size %d at offset %d",
count, skip);
if (skip + count > flxdec->hdr.width) {
GST_ERROR_OBJECT (flxdec, "Invalid FLI packet detected. "
"line too long.");
return FALSE;
}
/* replicate run */
if (!gst_byte_reader_get_data (reader, count, &data))
goto error;
if (!gst_byte_writer_put_data (writer, data, count))
goto error;
}
}
line_start_i += flxdec->hdr.width;
if (!gst_byte_writer_set_pos (writer, line_start_i))
goto error;
}
return TRUE;
error:
GST_ERROR_OBJECT (flxdec, "Failed to decode FLI packet");
return FALSE;
}
static gboolean
flx_decode_chunks (GstFlxDec * flxdec, gulong n_chunks, GstByteReader * reader,
GstByteWriter * writer)
{
gboolean ret = TRUE;
while (n_chunks--) {
GstByteReader chunk;
guint32 size;
guint16 type;
if (!gst_byte_reader_get_uint32_le (reader, &size))
goto parse_error;
if (!gst_byte_reader_get_uint16_le (reader, &type))
goto parse_error;
GST_LOG_OBJECT (flxdec, "chunk has type 0x%02x size %d", type, size);
if (!gst_byte_reader_get_sub_reader (reader, &chunk,
size - FlxFrameChunkSize)) {
GST_ERROR_OBJECT (flxdec, "Incorrect size in the chunk header");
goto error;
}
switch (type) {
case FLX_COLOR64:
ret = flx_decode_color (flxdec, &chunk, writer, 2);
break;
case FLX_COLOR256:
ret = flx_decode_color (flxdec, &chunk, writer, 0);
break;
case FLX_BRUN:
ret = flx_decode_brun (flxdec, &chunk, writer);
break;
case FLX_LC:
ret = flx_decode_delta_fli (flxdec, &chunk, writer);
break;
case FLX_SS2:
ret = flx_decode_delta_flc (flxdec, &chunk, writer);
break;
case FLX_BLACK:
ret = gst_byte_writer_fill (writer, 0, flxdec->size);
break;
case FLX_MINI:
break;
default:
GST_WARNING ("Unimplemented chunk type: 0x%02x size: %d - skipping",
type, size);
break;
}
if (!ret)
break;
}
return ret;
parse_error:
GST_ERROR_OBJECT (flxdec, "Failed to decode chunk");
error:
return FALSE;
}
