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First version of xsub decoder, not yet tested

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Originally committed as revision 9933 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2007-08-05 12:11:09 +00:00
parent 6b05eb3117
commit 7e2643ae8d
5 changed files with 90 additions and 0 deletions
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1
libavcodec/Makefile
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@ -210,6 +210,7 @@ OBJS-$(CONFIG_XAN_DPCM_DECODER) += dpcm.o
OBJS-$(CONFIG_XAN_WC3_DECODER) += xan.o
OBJS-$(CONFIG_XAN_WC4_DECODER) += xan.o
OBJS-$(CONFIG_XL_DECODER) += xl.o
OBJS-$(CONFIG_XSUB_DECODER) += xsubdec.o
OBJS-$(CONFIG_ZLIB_DECODER) += lcldec.o
OBJS-$(CONFIG_ZLIB_ENCODER) += lclenc.o
OBJS-$(CONFIG_ZMBV_DECODER) += zmbv.o

1
libavcodec/allcodecs.c
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@ -160,6 +160,7 @@ void avcodec_register_all(void)
REGISTER_DECODER(WNV1, wnv1);
REGISTER_DECODER(XAN_WC3, xan_wc3);
REGISTER_DECODER(XL, xl);
REGISTER_DECODER(XSUB, xsub);
REGISTER_ENCDEC (ZLIB, zlib);
REGISTER_ENCDEC (ZMBV, zmbv);

1
libavcodec/allcodecs.h
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@ -204,6 +204,7 @@ extern AVCodec ws_snd1_decoder;
extern AVCodec xan_dpcm_decoder;
extern AVCodec xan_wc3_decoder;
extern AVCodec xl_decoder;
extern AVCodec xsub_decoder;
extern AVCodec zmbv_decoder;
/* PCM codecs */

1
libavcodec/avcodec.h
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@ -265,6 +265,7 @@ enum CodecID {
CODEC_ID_DVD_SUBTITLE= 0x17000,
CODEC_ID_DVB_SUBTITLE,
CODEC_ID_TEXT, /* raw UTF-8 text */
CODEC_ID_XSUB,
CODEC_ID_MPEG2TS= 0x20000, /* _FAKE_ codec to indicate a raw MPEG-2 TS
* stream (only used by libavformat) */

86
libavcodec/xsubdec.c Normal file
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@ -0,0 +1,86 @@
#include "avcodec.h"
#include "bitstream.h"
#include "bytestream.h"
static int decode_init(AVCodecContext *avctx) {
avctx->pix_fmt = PIX_FMT_PAL8;
return 0;
}
static const uint8_t runbits[8] = { 2, 2, 6, 6, 10, 10, 14, 14 };
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
uint8_t *buf, int buf_size) {
AVSubtitle *sub = data;
uint8_t *buf_end = buf + buf_size;
uint8_t *bitmap;
int w, h, x, y, rlelen, i;
GetBitContext gb;
// check that at least header fits
if (buf_size < 27 + 7 * 2 + 4 * 3) {
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
return -1;
}
// read header
w = bytestream_get_le16(&buf);
h = bytestream_get_le16(&buf);
if (avcodec_check_dimensions(avctx, w, h) < 0)
return -1;
x = bytestream_get_le16(&buf);
y = bytestream_get_le16(&buf);
// skip bottom right position, it gives no new information
bytestream_get_le16(&buf);
bytestream_get_le16(&buf);
rlelen = bytestream_get_le16(&buf);
// allocate sub and set values
if (!sub->rects) {
sub->rects = av_mallocz(sizeof(AVSubtitleRect));
sub->num_rects = 1;
}
av_freep(sub->rects[0].bitmap);
sub->rects[0].x = x; sub->rects[0].y = y;
sub->rects[0].w = w; sub->rects[0].h = h;
sub->rects[0].linesize = w;
sub->rects[0].bitmap = av_malloc(w * h);
sub->rects[0].nb_colors = 4;
sub->rects[0].rgba_palette = av_malloc(sub->rects[0].nb_colors * 4);
// read palette
for (i = 0; i < sub->rects[0].nb_colors; i++)
sub->rects[0].rgba_palette[i] = bytestream_get_be24(&buf);
// process RLE-compressed data
rlelen = FFMIN(rlelen, buf_end - buf);
init_get_bits(&gb, buf, rlelen * 8);
bitmap = sub->rects[0].bitmap;
for (y = 0; y < h; y++) {
for (x = 0; x < w; ) {
int log2 = ff_log2_tab[show_bits(&gb, 8)];
int run = get_bits(&gb, runbits[log2]);
int colour = get_bits(&gb, 2);
run = FFMIN(run, w - x);
// run length 0 means till end of row
if (!run) run = w - x;
memset(bitmap, colour, run);
bitmap += run;
x += run;
}
align_get_bits(&gb);
}
*data_size = 1;
return buf_size;
}
AVCodec xsub_decoder = {
"xsub",
CODEC_TYPE_SUBTITLE,
CODEC_ID_XSUB,
0,
decode_init,
NULL,
NULL,
decode_frame,
};