/// <summary>
///
/// </summary>
/// <param name="avctx"></param>
/// <returns></returns>
override public int close(AVCodecContext avctx)
{
var c = (BMPContext)avctx.priv_data;
if (!c.picture.data[0].IsNull)
{
avctx.release_buffer(avctx, c.picture);
}
return 0;
}
/// <summary>
///
/// </summary>
/// <param name="avctx"></param>
/// <returns></returns>
public override int close(AVCodecContext avctx)
{
var s = (TargaContext)avctx.priv_data;
if (!s.picture.data[0].IsNull)
{
avctx.release_buffer(avctx, s.picture);
}
return 0;
}
/// <summary>
///
/// </summary>
/// <param name="avctx"></param>
/// <param name="outdata"></param>
/// <param name="outdata_size"></param>
/// <param name="avpkt"></param>
/// <returns></returns>
public override int decode(AVCodecContext avctx, ref object outputData, AVPacket avpkt)
{
Pointer<byte> buf = avpkt.data;
int buf_size = avpkt.size;
BMPContext s = (BMPContext)avctx.priv_data;
AVFrame p = s.picture;
uint fsize, hsize;
int width, height;
int depth;
BiCompression comp;
uint ihsize;
int i, n, linesize;
var rgb = new uint[3];
uint alpha = 0;
Pointer<byte> ptr;
int dsize;
Pointer<byte> buf0 = buf;
if (buf_size < 14)
{
log.av_log(avctx, log.AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
return -1;
}
if (bytestream.get_byte(ref buf) != 'B' || bytestream.get_byte(ref buf) != 'M')
{
log.av_log(avctx, log.AV_LOG_ERROR, "bad magic number\n");
return -1;
}
fsize = bytestream.get_le32(ref buf);
if (buf_size < fsize)
{
log.av_log(avctx, log.AV_LOG_ERROR, "not enough data (%d < %d), trying to decode anyway\n", buf_size, fsize);
fsize = (uint)buf_size;
}
buf += 2; /* reserved1 */
buf += 2; /* reserved2 */
hsize = bytestream.get_le32(ref buf); /* header size */
ihsize = bytestream.get_le32(ref buf); /* more header size */
if (ihsize + 14 > hsize)
{
log.av_log(avctx, log.AV_LOG_ERROR, "invalid header size %d\n", hsize);
return -1;
}
/* sometimes file size is set to some headers size, set a real size in that case */
if (fsize == 14 || fsize == ihsize + 14)
{
fsize = (uint)(buf_size - 2);
}
if (fsize <= hsize)
{
log.av_log(avctx, log.AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n", fsize, hsize);
return -1;
}
switch (ihsize)
{
case 40: // windib
case 56: // windib v3
case 64: // OS/2 v2
case 108: // windib v4
case 124: // windib v5
width = (int)bytestream.get_le32(ref buf);
height = (int)bytestream.get_le32(ref buf);
break;
case 12: // OS/2 v1
width = (int)bytestream.get_le16(ref buf);
height = (int)bytestream.get_le16(ref buf);
break;
default:
log.av_log(avctx, log.AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
return -1;
}
if (bytestream.get_le16(ref buf) != 1) /* planes */
{
log.av_log(avctx, log.AV_LOG_ERROR, "invalid BMP header\n");
return -1;
}
depth = bytestream.get_le16(ref buf);
if (ihsize == 40 || ihsize == 64 || ihsize == 56)
{
comp = (BiCompression)bytestream.get_le32(ref buf);
}
else
{
comp = BiCompression.BMP_RGB;
}
if (comp != BiCompression.BMP_RGB && comp != BiCompression.BMP_BITFIELDS && comp != BiCompression.BMP_RLE4 && comp != BiCompression.BMP_RLE8)
{
log.av_log(avctx, log.AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
return -1;
}
if (comp == BiCompression.BMP_BITFIELDS)
{
buf += 20;
rgb[0] = bytestream.get_le32(ref buf);
rgb[1] = bytestream.get_le32(ref buf);
rgb[2] = bytestream.get_le32(ref buf);
if (ihsize >= 108)
{
alpha = bytestream.get_le32(ref buf);
}
}
avctx.width = width;
avctx.height = height > 0 ? height : -height;
avctx.pix_fmt = PixelFormat.PIX_FMT_NONE;
switch (depth)
{
case 32:
if (comp == BiCompression.BMP_BITFIELDS)
{
if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
{
avctx.pix_fmt = (alpha != 0) ? PixelFormat.PIX_FMT_ABGR : PixelFormat.PIX_FMT_0BGR;
}
else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
{
avctx.pix_fmt = (alpha != 0) ? PixelFormat.PIX_FMT_BGRA : PixelFormat.PIX_FMT_BGR0;
}
else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
{
avctx.pix_fmt = (alpha != 0) ? PixelFormat.PIX_FMT_ARGB : PixelFormat.PIX_FMT_0RGB;
}
else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
{
avctx.pix_fmt = (alpha != 0) ? PixelFormat.PIX_FMT_RGBA : PixelFormat.PIX_FMT_RGB0;
}
else
{
log.av_log(avctx, log.AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
return error.AVERROR(error.EINVAL);
}
}
else
{
avctx.pix_fmt = PixelFormat.PIX_FMT_BGRA;
}
break;
case 24:
avctx.pix_fmt = PixelFormat.PIX_FMT_BGR24;
break;
case 16:
if (comp == BiCompression.BMP_RGB)
{
avctx.pix_fmt = PixelFormat.PIX_FMT_RGB555;
}
else if (comp == BiCompression.BMP_BITFIELDS)
{
if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F) avctx.pix_fmt = PixelFormat.PIX_FMT_RGB565;
else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F) avctx.pix_fmt = PixelFormat.PIX_FMT_RGB555;
else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F) avctx.pix_fmt = PixelFormat.PIX_FMT_RGB444;
else
{
log.av_log(avctx, log.AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
return error.AVERROR(error.EINVAL);
}
}
break;
case 8:
if (hsize - ihsize - 14 > 0)
{
avctx.pix_fmt = PixelFormat.PIX_FMT_PAL8;
}
else
{
avctx.pix_fmt = PixelFormat.PIX_FMT_GRAY8;
}
break;
case 1:
case 4:
if (hsize - ihsize - 14 > 0)
{
avctx.pix_fmt = PixelFormat.PIX_FMT_PAL8;
}
else
{
log.av_log(avctx, log.AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1 << depth);
return -1;
}
break;
default:
log.av_log(avctx, log.AV_LOG_ERROR, "depth %d not supported\n", depth);
return -1;
}
if (avctx.pix_fmt == PixelFormat.PIX_FMT_NONE)
{
log.av_log(avctx, log.AV_LOG_ERROR, "unsupported pixel format\n");
return -1;
}
if (!p.data[0].IsNull) avctx.release_buffer(avctx, p);
p.reference = 0;
if (avctx.get_buffer(avctx, p) < 0)
{
log.av_log(avctx, log.AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
p.pict_type = AVPictureType.AV_PICTURE_TYPE_I;
p.key_frame = 1;
buf = buf0 + hsize;
dsize = (int)(buf_size - hsize);
/* Line size in file multiple of 4 */
n = (int)(((avctx.width * depth + 31) / 8) & ~3);
if (n * avctx.height > dsize && comp != BiCompression.BMP_RLE4 && comp != BiCompression.BMP_RLE8)
{
log.av_log(avctx, log.AV_LOG_ERROR, "not enough data (%d < %d)\n", dsize, n * avctx.height);
return -1;
}
// RLE may skip decoding some picture areas, so blank picture before decoding
if (comp == BiCompression.BMP_RLE4 || comp == BiCompression.BMP_RLE8)
{
CLib.memset(p.data[0], 0, avctx.height * p.linesize[0]);
}
if (depth == 4 || depth == 8)
{
CLib.memset(p.data[1], 0, 1024);
}
if (height > 0)
{
ptr = p.data[0] + (avctx.height - 1) * p.linesize[0];
linesize = -p.linesize[0];
}
else
{
ptr = p.data[0];
linesize = p.linesize[0];
}
if (avctx.pix_fmt == PixelFormat.PIX_FMT_PAL8)
{
int colors = (1 << depth);
if (ihsize >= 36)
{
int t;
buf = buf0 + 46;
t = (int)bytestream.get_le32(ref buf);
if (t < 0 || t > (int)(1 << depth))
{
log.av_log(avctx, log.AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth);
}
else if (t != 0)
{
colors = t;
}
}
buf = buf0 + 14 + ihsize; //palette location
if ((hsize - ihsize - 14) < (colors << 2)) // OS/2 bitmap, 3 bytes per palette entry
{
for (i = 0; i < colors; i++)
{
var a = p.data[1].CastPointer<uint>();
a[i] = (uint)((0xff << 24) | bytestream.get_le24(ref buf));
}
}
else
{
for (i = 0; i < colors; i++)
{
var a = p.data[1].CastPointer<uint>();
a[i] = (uint)((0xFFU << 24) | bytestream.get_le32(ref buf));
}
}
buf = buf0 + hsize;
}
if (comp == BiCompression.BMP_RLE4 || comp == BiCompression.BMP_RLE8)
{
if (height < 0)
{
p.data[0] += p.linesize[0] * (avctx.height - 1);
p.linesize[0] = -p.linesize[0];
}
//ff_msrle_decode(avctx, (AVPicture)p, depth, buf, dsize);
Unimplemented.Mark();
if (height < 0)
{
p.data[0] += p.linesize[0] * (avctx.height - 1);
p.linesize[0] = -p.linesize[0];
}
}
else
{
switch (depth)
{
case 1:
for (i = 0; i < avctx.height; i++)
{
for (int j = 0; j < n; j++)
{
ptr[j * 8 + 0] = (byte)((buf[j] >> 7) );
ptr[j * 8 + 1] = (byte)((buf[j] >> 6) & 1);
ptr[j * 8 + 2] = (byte)((buf[j] >> 5) & 1);
ptr[j * 8 + 3] = (byte)((buf[j] >> 4) & 1);
ptr[j * 8 + 4] = (byte)((buf[j] >> 3) & 1);
ptr[j * 8 + 5] = (byte)((buf[j] >> 2) & 1);
ptr[j * 8 + 6] = (byte)((buf[j] >> 1) & 1);
ptr[j * 8 + 7] = (byte)((buf[j] >> 0) & 1);
}
buf += n;
ptr += linesize;
}
break;
case 8:
case 24:
case 32:
for (i = 0; i < avctx.height; i++)
{
//Console.WriteLine("i={0}, BytesPerRow={1}, linesize={2}", i, n, linesize);
CLib.memcpy(ptr, buf, n);
buf += n;
ptr += linesize;
}
break;
case 4:
for(i = 0; i < avctx.height; i++){
for(int j = 0; j < n; j++)
{
ptr[j * 2 + 0] = (byte)((buf[j] >> 4) & 0xF);
ptr[j * 2 + 1] = (byte)(buf[j] & 0xF);
}
buf += n;
ptr += linesize;
}
break;
case 16:
for (i = 0; i < avctx.height; i++)
{
Pointer<ushort> src = buf.CastPointer<ushort>();
Pointer<ushort> dst = ptr.CastPointer<ushort>();
for (int j = 0; j < avctx.width; j++)
{
dst[0] = av_bswap.av_le2ne16(src[0]);
src++;
dst++;
}
buf += n;
ptr += linesize;
}
break;
default:
log.av_log(avctx, log.AV_LOG_ERROR, "BMP decoder is broken\n");
return -1;
}
}
outputData = s.picture;
return buf_size;
} // decode
public override int decode(AVCodecContext avctx, ref object outdata, AVPacket avpkt)
{
outdata = null;
TargaContext s = (TargaContext)avctx.priv_data;
//AVFrame *picture = data;
AVFrame p = s.picture;
Pointer<byte> dst;
int stride;
TargaCompr compr;
int idlen, pal, y, w, h, bpp, flags;
int first_clr, colors, csize;
bytestream2.init(ref s.gb, avpkt.data, avpkt.size);
/* parse image header */
idlen = bytestream2.get_byte(ref s.gb);
pal = bytestream2.get_byte(ref s.gb);
compr = (TargaCompr)bytestream2.get_byte(ref s.gb);
first_clr = bytestream2.get_le16(ref s.gb);
colors = bytestream2.get_le16(ref s.gb);
csize = bytestream2.get_byte(ref s.gb);
bytestream2.skip(ref s.gb, 4); /* 2: x, 2: y */
w = bytestream2.get_le16(ref s.gb);
h = bytestream2.get_le16(ref s.gb);
bpp = bytestream2.get_byte(ref s.gb);
if (bytestream2.get_bytes_left(ref s.gb) <= idlen) {
log.av_log(avctx, log.AV_LOG_ERROR, "Not enough data to read header\n");
return error.AVERROR_INVALIDDATA;
}
flags = bytestream2.get_byte(ref s.gb);
if ((pal == 0) && ((first_clr != 0) || (colors != 0) || (csize != 0)))
{
log.av_log(avctx, log.AV_LOG_WARNING, "File without colormap has colormap information set.\n");
// specification says we should ignore those value in this case
first_clr = colors = csize = 0;
}
// skip identifier if any
bytestream2.skip(ref s.gb, idlen);
switch(bpp){
case 8:
avctx.pix_fmt = ((TargaCompr)((int)compr & (~(int)TargaCompr.TGA_RLE)) == TargaCompr.TGA_BW) ? PixelFormat.PIX_FMT_GRAY8 : PixelFormat.PIX_FMT_PAL8;
break;
case 15:
case 16:
avctx.pix_fmt = PixelFormat.PIX_FMT_RGB555LE;
break;
case 24:
avctx.pix_fmt = PixelFormat.PIX_FMT_BGR24;
break;
case 32:
avctx.pix_fmt = PixelFormat.PIX_FMT_BGRA;
break;
default:
log.av_log(avctx, log.AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
return -1;
}
if (!s.picture.data[0].IsNull) avctx.release_buffer(avctx, s.picture);
if (imgutils.av_image_check_size((uint)w, (uint)h, 0, avctx) != 0) return -1;
if (w != avctx.width || h != avctx.height) Functions.avcodec_set_dimensions(avctx, w, h);
if (avctx.get_buffer(avctx, p) < 0)
{
log.av_log(avctx, log.AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
if ((flags & 0x20) != 0)
{
dst = p.data[0];
stride = p.linesize[0];
}
else
{
//image is upside-down
dst = p.data[0] + p.linesize[0] * (h - 1);
stride = -p.linesize[0];
}
if (colors != 0)
{
int pal_size, pal_sample_size;
if((colors + first_clr) > 256){
log.av_log(avctx, log.AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
return -1;
}
switch (csize) {
case 24: pal_sample_size = 3; break;
case 16:
case 15: pal_sample_size = 2; break;
default:
log.av_log(avctx, log.AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
return -1;
}
pal_size = colors * pal_sample_size;
if (avctx.pix_fmt != PixelFormat.PIX_FMT_PAL8)
{
//should not occur but skip palette anyway
bytestream2.skip(ref s.gb, pal_size);
}
else
{
int t;
var ppal = p.data[1].CastPointer<uint>() + first_clr;
if (bytestream2.get_bytes_left(ref s.gb) < pal_size)
{
log.av_log(avctx, log.AV_LOG_ERROR, "Not enough data to read palette\n");
return error.AVERROR_INVALIDDATA;
}
switch (pal_sample_size)
{
case 3:
/* RGB24 */
for (t = 0; t < colors; t++)
{
ppal[0] = (0xffU << 24) | bytestream2.get_le24u(ref s.gb);
ppal++;
}
break;
case 2:
/* RGB555 */
for (t = 0; t < colors; t++)
{
var v = (uint)bytestream2.get_le16u(ref s.gb);
v = ((v & 0x7C00) << 9) |
((v & 0x03E0) << 6) |
((v & 0x001F) << 3);
/* left bit replication */
v |= (v & 0xE0E0E0U) >> 5;
ppal[0] = (0xffU << 24) | v;
ppal++;
}
break;
}
p.palette_has_changed = 1;
}
}
if ((compr & (~TargaCompr.TGA_RLE)) == TargaCompr.TGA_NODATA)
{
CLib.memset(p.data[0], 0, p.linesize[0] * h);
}
else {
if ((compr & TargaCompr.TGA_RLE) != 0)
{
//int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp);
//if (res < 0) return res;
throw (new NotImplementedException());
}
else
{
var img_size = w * ((bpp + 1) >> 3);
if (bytestream2.get_bytes_left(ref s.gb) < img_size * h) {
log.av_log(avctx, log.AV_LOG_ERROR, "Not enough data available for image\n");
return error.AVERROR_INVALIDDATA;
}
for (y = 0; y < h; y++)
{
bytestream2.get_bufferu(ref s.gb, dst, img_size);
dst += stride;
}
}
}
if ((flags & 0x10) != 0) // right-to-left, needs horizontal flip
{
int x;
for(y = 0; y < h; y++){
var line = p.data[0].GetOffsetPointer(y * p.linesize[0]);
for (x = 0; x < w >> 1; x++)
{
switch (bpp)
{
case 32:
line.CastPointer<uint>().SwapValuesAtOffsets((x), (w - x - 1));
break;
case 24:
line.CastPointer<byte>().SwapValuesAtOffsets((3 * x + 0), (3 * w - 3 * x - 3));
line.CastPointer<byte>().SwapValuesAtOffsets((3 * x + 1), (3 * w - 3 * x - 2));
line.CastPointer<byte>().SwapValuesAtOffsets((3 * x + 2), (3 * w - 3 * x - 1));
break;
case 16:
line.CastPointer<ushort>().SwapValuesAtOffsets((x), (w -x - 1));
break;
case 8:
line.CastPointer<byte>().SwapValuesAtOffsets((x), (w -x - 1));
break;
}
}
}
}
outdata = s.picture;
return avpkt.size;
}