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j2k: restructure bitstream decoding

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This is based on jpeg2000 but differs because of
problems with the design from jpeg2000 with currently
supported files

More files can be decoded after this commit, though they
show heavy artifacts

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-31 00:46:45 +02:00
parent cdb86136f7
commit f471b5fa30
1 changed files with 26 additions and 19 deletions
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45
libavcodec/j2kdec.c
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@ -43,9 +43,8 @@
#define HAD_QCC 0x02
typedef struct Jpeg2000TilePart {
uint16_t tp_idx; // Tile-part index
uint8_t tile_index; // Tile index who refers the tile-part
uint32_t tp_len; // Length of tile-part
const uint8_t *tp_end;
GetByteContext tpg; // bit stream in tile-part
} Jpeg2000TilePart;
@ -57,6 +56,7 @@ typedef struct Jpeg2000Tile {
Jpeg2000CodingStyle codsty[4];
Jpeg2000QuantStyle qntsty[4];
Jpeg2000TilePart tile_part[3];
uint16_t tp_idx; // Tile-part index
} Jpeg2000Tile;
typedef struct Jpeg2000DecoderContext {
@ -464,10 +464,10 @@ static int get_sot(Jpeg2000DecoderContext *s, int n)
return AVERROR_PATCHWELCOME;
}
s->tile[s->curtileno].tp_idx = TPsot;
tp = s->tile[s->curtileno].tile_part + TPsot;
tp->tile_index = Isot;
tp->tp_len = Psot;
tp->tp_idx = TPsot;
tp->tp_end = s->g.buffer + Psot - n - 2;
if (!TPsot) {
Jpeg2000Tile *tile = s->tile + s->curtileno;
@ -531,6 +531,7 @@ static int init_tile(Jpeg2000DecoderContext *s, int tileno)
if (!tile->comp)
return AVERROR(ENOMEM);
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000Component *comp = tile->comp + compno;
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
@ -1106,7 +1107,7 @@ static void jpeg2000_dec_cleanup(Jpeg2000DecoderContext *s)
av_freep(&s->tile);
}
static int jpeg2000_decode_codestream(Jpeg2000DecoderContext *s)
static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
{
Jpeg2000CodingStyle *codsty = s->codsty;
Jpeg2000QuantStyle *qntsty = s->qntsty;
@ -1127,14 +1128,11 @@ static int jpeg2000_decode_codestream(Jpeg2000DecoderContext *s)
if (marker == JPEG2000_SOD) {
Jpeg2000Tile *tile = s->tile + s->curtileno;
if (ret = init_tile(s, s->curtileno)) {
av_log(s->avctx, AV_LOG_ERROR, "tile initialization failed\n");
return ret;
}
if (ret = jpeg2000_decode_packets(s, tile)) {
av_log(s->avctx, AV_LOG_ERROR, "packets decoding failed\n");
return ret;
}
Jpeg2000TilePart *tp = tile->tile_part + tile->tp_idx;
bytestream2_init(&tp->tpg, s->g.buffer, tp->tp_end - s->g.buffer);
bytestream2_skip(&s->g, tp->tp_end - s->g.buffer);
continue;
}
if (marker == JPEG2000_EOC)
@ -1196,12 +1194,18 @@ static int jpeg2000_decode_codestream(Jpeg2000DecoderContext *s)
static int jpeg2000_read_bitstream_packets(Jpeg2000DecoderContext *s)
{
int ret = 0;
Jpeg2000Tile *tile = s->tile + s->curtileno;
int tileno;
if (ret = init_tile(s, s->curtileno))
return ret;
if (ret = jpeg2000_decode_packets(s, tile))
return ret;
for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) {
Jpeg2000Tile *tile = s->tile + tileno;
if (ret = init_tile(s, tileno))
return ret;
s->g = tile->tile_part[0].tpg;
if (ret = jpeg2000_decode_packets(s, tile))
return ret;
}
return 0;
}
@ -1269,7 +1273,10 @@ static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
ret = -1;
goto err_out;
}
if (ret = jpeg2000_decode_codestream(s))
if (ret = jpeg2000_read_main_headers(s))
goto err_out;
if (ret = jpeg2000_read_bitstream_packets(s))
goto err_out;
for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)