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libavcodec/j2kenc: Allow Encoder to use SOP and EPH markers

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This patch allows the encoder to use SOP and EPH
markers. This would be useful as these markers
provide better error detection mechanisms.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Gautam Ramakrishnan 2020-08-04 18:28:02 +05:30 committed by Michael Niedermayer
parent 1fbfa42432
commit 5508e7bf8a
1 changed files with 22 additions and 6 deletions
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28
libavcodec/j2kenc.c
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@ -129,6 +129,8 @@ typedef struct {
int format;
int pred;
int sop;
int eph;
} Jpeg2000EncoderContext;
@ -308,13 +310,18 @@ static int put_siz(Jpeg2000EncoderContext *s)
static int put_cod(Jpeg2000EncoderContext *s)
{
Jpeg2000CodingStyle *codsty = &s->codsty;
uint8_t scod = 0;
if (s->buf_end - s->buf < 14)
return -1;
bytestream_put_be16(&s->buf, JPEG2000_COD);
bytestream_put_be16(&s->buf, 12); // Lcod
bytestream_put_byte(&s->buf, 0); // Scod
if (s->sop)
scod |= JPEG2000_CSTY_SOP;
if (s->eph)
scod |= JPEG2000_CSTY_EPH;
bytestream_put_byte(&s->buf, scod); // Scod
// SGcod
bytestream_put_byte(&s->buf, 0); // progression level
bytestream_put_be16(&s->buf, 1); // num of layers
@ -719,14 +726,18 @@ static void putnumpasses(Jpeg2000EncoderContext *s, int n)
static int encode_packet(Jpeg2000EncoderContext *s, Jpeg2000ResLevel *rlevel, int precno,
uint8_t *expn, int numgbits)
uint8_t *expn, int numgbits, int packetno)
{
int bandno, empty = 1;
// init bitstream
*s->buf = 0;
s->bit_index = 0;
if (s->sop) {
bytestream_put_be16(&s->buf, JPEG2000_SOP);
bytestream_put_be16(&s->buf, 4);
bytestream_put_be16(&s->buf, packetno);
}
// header
// is the packet empty?
@ -794,6 +805,10 @@ static int encode_packet(Jpeg2000EncoderContext *s, Jpeg2000ResLevel *rlevel, in
}
}
j2k_flush(s);
if (s->eph) {
bytestream_put_be16(&s->buf, JPEG2000_EPH);
}
for (bandno = 0; bandno < rlevel->nbands; bandno++){
Jpeg2000Band *band = rlevel->band + bandno;
Jpeg2000Prec *prec = band->prec + precno;
@ -821,7 +836,7 @@ static int encode_packets(Jpeg2000EncoderContext *s, Jpeg2000Tile *tile, int til
int compno, reslevelno, ret;
Jpeg2000CodingStyle *codsty = &s->codsty;
Jpeg2000QuantStyle *qntsty = &s->qntsty;
int packetno = 0;
av_log(s->avctx, AV_LOG_DEBUG, "tier2\n");
// lay-rlevel-comp-pos progression
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
@ -830,7 +845,7 @@ static int encode_packets(Jpeg2000EncoderContext *s, Jpeg2000Tile *tile, int til
Jpeg2000ResLevel *reslevel = s->tile[tileno].comp[compno].reslevel + reslevelno;
for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
if ((ret = encode_packet(s, reslevel, precno, qntsty->expn + (reslevelno ? 3*reslevelno-2 : 0),
qntsty->nguardbits)) < 0)
qntsty->nguardbits, packetno++)) < 0)
return ret;
}
}
@ -1244,7 +1259,8 @@ static const AVOption options[] = {
{ "pred", "DWT Type", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE, "pred" },
{ "dwt97int", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
{ "dwt53", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
{ "sop", "SOP marker", OFFSET(sop), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE, },
{ "eph", "EPH marker", OFFSET(eph), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE, },
{ NULL }
};