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movtextdec.c: Add support for highlight and hilightcolor box 

Signed-off-by: Niklesh <niklesh.lalwani@iitb.ac.in>
tags/n2.8
Niklesh Philip Langdale 10 years ago
parent
a3b721d10d
commit
774ceee17e
1 changed files with 172 additions and 80 deletions
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  1. +172
    -80
      libavcodec/movtextdec.c

+ 172
- 80
libavcodec/movtextdec.c View File

@@ -31,37 +31,165 @@
#define STYLE_FLAG_ITALIC (1<<1)
#define STYLE_FLAG_UNDERLINE (1<<2)

#define STYL_BOX (1<<0)
#define HLIT_BOX (1<<1)
#define HCLR_BOX (1<<2)

typedef struct {
uint16_t style_start;
uint16_t style_end;
uint8_t style_flag;
} StyleBox;

typedef struct {
uint16_t hlit_start;
uint16_t hlit_end;
} HighlightBox;

typedef struct {
uint8_t hlit_color[4];
} HilightcolorBox;

typedef struct {
StyleBox **s;
StyleBox *s_temp;
HighlightBox h;
HilightcolorBox c;
uint8_t box_flags;
uint16_t style_entries;
uint64_t tracksize;
int size_var;
int count_s;
} MovTextContext;

typedef struct {
uint32_t type;
size_t base_size;
int (*decode)(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt);
} Box;

static void mov_text_cleanup(MovTextContext *m)
{
int i;
if (m->box_flags & STYL_BOX) {
for(i = 0; i < m->count_s; i++) {
av_freep(&m->s[i]);
}
av_freep(&m->s);
}
}

static int decode_hlit(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
{
m->box_flags |= HLIT_BOX;
m->h.hlit_start = AV_RB16(tsmb);
tsmb += 2;
m->h.hlit_end = AV_RB16(tsmb);
tsmb += 2;
return 0;
}

static int decode_hclr(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
{
m->box_flags |= HCLR_BOX;
memcpy(m->c.hlit_color, tsmb, 4);
tsmb += 4;
return 0;
}

static int decode_styl(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
{
int i;
m->style_entries = AV_RB16(tsmb);
tsmb += 2;
// A single style record is of length 12 bytes.
if (m->tracksize + m->size_var + 2 + m->style_entries * 12 > avpkt->size)
return -1;

m->box_flags |= STYL_BOX;
for(i = 0; i < m->style_entries; i++) {
m->s_temp = av_malloc(sizeof(*m->s_temp));
if (!m->s_temp) {
mov_text_cleanup(m);
return AVERROR(ENOMEM);
}
m->s_temp->style_start = AV_RB16(tsmb);
tsmb += 2;
m->s_temp->style_end = AV_RB16(tsmb);
tsmb += 2;
// fontID = AV_RB16(tsmb);
tsmb += 2;
m->s_temp->style_flag = AV_RB8(tsmb);
av_dynarray_add(&m->s, &m->count_s, m->s_temp);
if(!m->s) {
mov_text_cleanup(m);
return AVERROR(ENOMEM);
}
// fontsize = AV_RB8(tsmb);
tsmb += 2;
// text-color-rgba
tsmb += 4;
}
return 0;
}

static const Box box_types[] = {
{ MKBETAG('s','t','y','l'), 2, decode_styl },
{ MKBETAG('h','l','i','t'), 4, decode_hlit },
{ MKBETAG('h','c','l','r'), 4, decode_hclr }
};

const static size_t box_count = FF_ARRAY_ELEMS(box_types);

static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end,
StyleBox **s, int style_entries)
MovTextContext *m)
{
int i = 0;
int text_pos = 0;
while (text < text_end) {
for (i = 0; i < style_entries; i++) {
if (s[i]->style_flag && text_pos == s[i]->style_end) {
if (s[i]->style_flag & STYLE_FLAG_BOLD)
av_bprintf(buf, "{\\b0}");
if (s[i]->style_flag & STYLE_FLAG_ITALIC)
av_bprintf(buf, "{\\i0}");
if (s[i]->style_flag & STYLE_FLAG_UNDERLINE)
av_bprintf(buf, "{\\u0}");
if (m->box_flags & STYL_BOX) {
for (i = 0; i < m->style_entries; i++) {
if (m->s[i]->style_flag && text_pos == m->s[i]->style_end) {
if (m->s[i]->style_flag & STYLE_FLAG_BOLD)
av_bprintf(buf, "{\\b0}");
if (m->s[i]->style_flag & STYLE_FLAG_ITALIC)
av_bprintf(buf, "{\\i0}");
if (m->s[i]->style_flag & STYLE_FLAG_UNDERLINE)
av_bprintf(buf, "{\\u0}");
}
}
for (i = 0; i < m->style_entries; i++) {
if (m->s[i]->style_flag && text_pos == m->s[i]->style_start) {
if (m->s[i]->style_flag & STYLE_FLAG_BOLD)
av_bprintf(buf, "{\\b1}");
if (m->s[i]->style_flag & STYLE_FLAG_ITALIC)
av_bprintf(buf, "{\\i1}");
if (m->s[i]->style_flag & STYLE_FLAG_UNDERLINE)
av_bprintf(buf, "{\\u1}");
}
}
}

for (i = 0; i < style_entries; i++) {
if (s[i]->style_flag && text_pos == s[i]->style_start) {
if (s[i]->style_flag & STYLE_FLAG_BOLD)
av_bprintf(buf, "{\\b1}");
if (s[i]->style_flag & STYLE_FLAG_ITALIC)
av_bprintf(buf, "{\\i1}");
if (s[i]->style_flag & STYLE_FLAG_UNDERLINE)
av_bprintf(buf, "{\\u1}");
if (m->box_flags & HLIT_BOX) {
if (text_pos == m->h.hlit_start) {
/* If hclr box is present, set the secondary color to the color
* specified. Otherwise, set primary color to white and secondary
* color to black. These colors will come from TextSampleModifier
* boxes in future and inverse video technique for highlight will
* be implemented.
*/
if (m->box_flags & HCLR_BOX) {
av_bprintf(buf, "{\\2c&H%02x%02x%02x&}", m->c.hlit_color[2],
m->c.hlit_color[1], m->c.hlit_color[0]);
} else {
av_bprintf(buf, "{\\1c&H000000&}{\\2c&HFFFFFF}");
}
}
if (text_pos == m->h.hlit_end) {
if (m->box_flags & HCLR_BOX) {
av_bprintf(buf, "{\\2c&H000000}");
} else {
av_bprintf(buf, "{\\1c&HFFFFFF&}{\\2c&H000000}");
}
}
}

@@ -96,17 +224,14 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
void *data, int *got_sub_ptr, AVPacket *avpkt)
{
AVSubtitle *sub = data;
MovTextContext *m = avctx->priv_data;
int ret, ts_start, ts_end;
AVBPrint buf;
char *ptr = avpkt->data;
char *end;
//char *ptr_temp;
int text_length, tsmb_type, style_entries;
uint64_t tsmb_size, tracksize;
StyleBox **s = {0, };
StyleBox *s_temp;
int text_length, tsmb_type, ret_tsmb;
uint64_t tsmb_size;
const uint8_t *tsmb;
int count, i, size_var;

if (!ptr || avpkt->size < 2)
return AVERROR_INVALIDDATA;
@@ -138,73 +263,49 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
(AVRational){1,100});

tsmb_size = 0;
tracksize = 2 + text_length;
m->tracksize = 2 + text_length;
m->style_entries = 0;
m->box_flags = 0;
m->count_s = 0;
// Note that the spec recommends lines be no longer than 2048 characters.
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
if (text_length + 2 != avpkt->size) {
while (tracksize + 8 <= avpkt->size) {
while (m->tracksize + 8 <= avpkt->size) {
// A box is a minimum of 8 bytes.
tsmb = ptr + tracksize - 2;
tsmb = ptr + m->tracksize - 2;
tsmb_size = AV_RB32(tsmb);
tsmb += 4;
tsmb_type = AV_RB32(tsmb);
tsmb += 4;

if (tsmb_size == 1) {
if (tracksize + 16 > avpkt->size)
if (m->tracksize + 16 > avpkt->size)
break;
tsmb_size = AV_RB64(tsmb);
tsmb += 8;
size_var = 18;
m->size_var = 16;
} else
size_var = 10;
//size_var is equal to 10 or 18 depending on the size of box
m->size_var = 8;
//size_var is equal to 8 or 16 depending on the size of box

if (tracksize + tsmb_size > avpkt->size)
if (m->tracksize + tsmb_size > avpkt->size)
break;

if (tsmb_type == MKBETAG('s','t','y','l')) {
if (tracksize + size_var > avpkt->size)
break;
style_entries = AV_RB16(tsmb);
tsmb += 2;

// A single style record is of length 12 bytes.
if (tracksize + size_var + style_entries * 12 > avpkt->size)
break;
count = 0;

for(i = 0; i < style_entries; i++) {
s_temp = av_malloc(sizeof(*s_temp));
if (!s_temp)
goto error;

s_temp->style_start = AV_RB16(tsmb);
tsmb += 2;
s_temp->style_end = AV_RB16(tsmb);
tsmb += 2;
// fontID = AV_RB16(tsmb);
tsmb += 2;
s_temp->style_flag = AV_RB8(tsmb);
av_dynarray_add(&s, &count, s_temp);
if(!s)
goto error;
//fontsize=AV_RB8(tsmb);
tsmb += 2;
// text-color-rgba
tsmb += 4;
}
text_to_ass(&buf, ptr, end, s, style_entries);

for(i = 0; i < count; i++) {
av_freep(&s[i]);
for (size_t i = 0; i < box_count; i++) {
if (tsmb_type == box_types[i].type) {
if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size)
break;
ret_tsmb = box_types[i].decode(tsmb, m, avpkt);
if (ret_tsmb == -1)
break;
}
av_freep(&s);
}
tracksize = tracksize + tsmb_size;
m->tracksize = m->tracksize + tsmb_size;
}
text_to_ass(&buf, ptr, end, m);
mov_text_cleanup(m);
} else
text_to_ass(&buf, ptr, end, NULL, 0);
text_to_ass(&buf, ptr, end, m);

ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_end - ts_start);
av_bprint_finalize(&buf, NULL);
@@ -212,16 +313,6 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
return ret;
*got_sub_ptr = sub->num_rects > 0;
return avpkt->size;

error:
for(i = 0; i < count; i++) {
av_freep(&s[i]);
}
av_freep(&s);
if (s_temp)
av_freep(&s_temp);
av_bprint_finalize(&buf, NULL);
return AVERROR(ENOMEM);
}

AVCodec ff_movtext_decoder = {
@@ -229,6 +320,7 @@ AVCodec ff_movtext_decoder = {
.long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_MOV_TEXT,
.priv_data_size = sizeof(MovTextContext),
.init = mov_text_init,
.decode = mov_text_decode_frame,
};

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