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ffmpeg.wasm-core
Commit 1f8278ee authored by John Stebbins's avatar John Stebbins Committed by Philip Langdale
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lavc/movtextenc: add font name handling 

Initializes the mov text sample description from the ASS header and
creates an mov font table from the fonts available in the ASS Styles.
Signed-off-by: 's avatarPhilip Langdale <philipl@overt.org>
parent dbdbcbf3
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Showing with 203 additions and 50 deletions
libavcodec/movtextenc.c
View file @ 1f8278ee
......@@ -80,6 +80,8 @@ typedef struct {
StyleBox d;
uint16_t text_pos;
uint16_t byte_count;
char ** fonts;
int font_count;
} MovTextContext;
typedef struct {
......@@ -172,69 +174,198 @@ static const Box box_types[] = {
const static size_t box_count = FF_ARRAY_ELEMS(box_types);
static av_cold int mov_text_encode_init(AVCodecContext *avctx)
static int mov_text_encode_close(AVCodecContext *avctx)
{
/*
* For now, we'll use a fixed default style. When we add styling
* support, this will be generated from the ASS style.
*/
static const uint8_t text_sample_entry[] = {
MovTextContext *s = avctx->priv_data;
int i;
ff_ass_split_free(s->ass_ctx);
if (s->style_attributes) {
for (i = 0; i < s->count; i++) {
av_freep(&s->style_attributes[i]);
}
av_freep(&s->style_attributes);
}
av_freep(&s->fonts);
av_freep(&s->style_attributes_temp);
av_bprint_finalize(&s->buffer, NULL);
return 0;
}
static int encode_sample_description(AVCodecContext *avctx)
{
ASS * ass;
ASSStyle * style;
int i, j;
uint32_t tsmb_size, tsmb_type, back_color, style_color;
uint16_t style_start, style_end, fontID, count;
int font_names_total_len = 0;
MovTextContext *s = avctx->priv_data;
static const uint8_t display_and_justification[] = {
0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags
0x01, // int8_t horizontal-justification
0xFF, // int8_t vertical-justification
0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
// BoxRecord {
};
// 0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
static const uint8_t box_record[] = {
// BoxRecord {
0x00, 0x00, // int16_t top
0x00, 0x00, // int16_t left
0x00, 0x00, // int16_t bottom
0x00, 0x00, // int16_t right
// };
// StyleRecord {
0x00, 0x00, // uint16_t startChar
0x00, 0x00, // uint16_t endChar
0x00, 0x01, // uint16_t font-ID
0x00, // uint8_t face-style-flags
0x12, // uint8_t font-size
0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
// };
// FontTableBox {
0x00, 0x00, 0x00, 0x12, // uint32_t size
'f', 't', 'a', 'b', // uint8_t name[4]
0x00, 0x01, // uint16_t entry-count
// FontRecord {
0x00, 0x01, // uint16_t font-ID
0x05, // uint8_t font-name-length
'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
// };
// };
// };
};
// StyleRecord {
// 0x00, 0x00, // uint16_t startChar
// 0x00, 0x00, // uint16_t endChar
// 0x00, 0x01, // uint16_t font-ID
// 0x00, // uint8_t face-style-flags
// 0x12, // uint8_t font-size
// 0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
// };
// FontTableBox {
// 0x00, 0x00, 0x00, 0x12, // uint32_t size
// 'f', 't', 'a', 'b', // uint8_t name[4]
// 0x00, 0x01, // uint16_t entry-count
// FontRecord {
// 0x00, 0x01, // uint16_t font-ID
// 0x05, // uint8_t font-name-length
// 'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
// };
// };
// Populate sample description from ASS header
ass = (ASS*)s->ass_ctx;
style = ff_ass_style_get(s->ass_ctx, "Default");
if (!style && ass->styles_count) {
style = &ass->styles[0];
}
s->d.style_fontID = DEFAULT_STYLE_FONT_ID;
s->d.style_fontsize = DEFAULT_STYLE_FONTSIZE;
s->d.style_color = DEFAULT_STYLE_COLOR;
s->d.style_flag = DEFAULT_STYLE_FLAG;
if (style) {
s->d.style_fontsize = style->font_size;
s->d.style_color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8 |
255 - ((uint32_t)style->primary_color >> 24);
s->d.style_flag = (!!style->bold * STYLE_FLAG_BOLD) |
(!!style->italic * STYLE_FLAG_ITALIC) |
(!!style->underline * STYLE_FLAG_UNDERLINE);
back_color = (BGR_TO_RGB(style->back_color & 0xffffff) << 8) |
(255 - ((uint32_t)style->back_color >> 24));
}
MovTextContext *s = avctx->priv_data;
s->avctx = avctx;
av_bprint_append_any(&s->buffer, display_and_justification,
sizeof(display_and_justification));
back_color = AV_RB32(&back_color);
av_bprint_append_any(&s->buffer, &back_color, 4);
// BoxRecord {
av_bprint_append_any(&s->buffer, box_record, sizeof(box_record));
// };
// StyleRecord {
style_start = AV_RB16(&s->d.style_start);
style_end = AV_RB16(&s->d.style_end);
fontID = AV_RB16(&s->d.style_fontID);
style_color = AV_RB32(&s->d.style_color);
av_bprint_append_any(&s->buffer, &style_start, 2);
av_bprint_append_any(&s->buffer, &style_end, 2);
av_bprint_append_any(&s->buffer, &fontID, 2);
av_bprint_append_any(&s->buffer, &s->d.style_flag, 1);
av_bprint_append_any(&s->buffer, &s->d.style_fontsize, 1);
av_bprint_append_any(&s->buffer, &style_color, 4);
// };
// Build font table
// We can't build a complete font table since that would require
// scanning all dialogs first. But we can at least fill in what
// is avaiable in the ASS header
if (style && ass->styles_count) {
// Find unique font names
av_dynarray_add(&s->fonts, &s->font_count, style->font_name);
font_names_total_len += strlen(style->font_name);
for (i = 0; i < ass->styles_count; i++) {
int found = 0;
for (j = 0; j < s->font_count; j++) {
if (!strcmp(s->fonts[j], ass->styles[i].font_name)) {
found = 1;
break;
}
}
if (!found) {
av_dynarray_add(&s->fonts, &s->font_count,
ass->styles[i].font_name);
font_names_total_len += strlen(ass->styles[i].font_name);
}
}
} else
av_dynarray_add(&s->fonts, &s->font_count, (char*)"Serif");
// FontTableBox {
tsmb_size = SIZE_ADD + 3 * s->font_count + font_names_total_len;
tsmb_size = AV_RB32(&tsmb_size);
tsmb_type = MKTAG('f','t','a','b');
count = AV_RB16(&s->font_count);
av_bprint_append_any(&s->buffer, &tsmb_size, 4);
av_bprint_append_any(&s->buffer, &tsmb_type, 4);
av_bprint_append_any(&s->buffer, &count, 2);
// FontRecord {
for (i = 0; i < s->font_count; i++) {
int len;
fontID = i + 1;
fontID = AV_RB16(&fontID);
av_bprint_append_any(&s->buffer, &fontID, 2);
len = strlen(s->fonts[i]);
av_bprint_append_any(&s->buffer, &len, 1);
av_bprint_append_any(&s->buffer, s->fonts[i], len);
}
// };
// };
s->style_attributes_temp = av_mallocz(sizeof(*s->style_attributes_temp));
if (!s->style_attributes_temp) {
if (!av_bprint_is_complete(&s->buffer)) {
return AVERROR(ENOMEM);
}
avctx->extradata_size = sizeof text_sample_entry;
avctx->extradata_size = s->buffer.len;
avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata)
if (!avctx->extradata) {
return AVERROR(ENOMEM);
}
memcpy(avctx->extradata, s->buffer.str, avctx->extradata_size);
av_bprint_clear(&s->buffer);
return 0;
}
static av_cold int mov_text_encode_init(AVCodecContext *avctx)
{
int ret;
MovTextContext *s = avctx->priv_data;
s->avctx = avctx;
av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
memcpy(avctx->extradata, text_sample_entry, avctx->extradata_size);
s->style_attributes_temp = av_mallocz(sizeof(*s->style_attributes_temp));
if (!s->style_attributes_temp) {
ret = AVERROR(ENOMEM);
goto fail;
}
s->ass_ctx = ff_ass_split(avctx->subtitle_header);
if (!s->ass_ctx) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
ret = encode_sample_description(avctx);
if (ret < 0)
goto fail;
// TODO: Initialize from ASS style record
s->d.style_fontID = DEFAULT_STYLE_FONT_ID;
s->d.style_fontsize = DEFAULT_STYLE_FONTSIZE;
s->d.style_color = DEFAULT_STYLE_COLOR;
s->d.style_flag = DEFAULT_STYLE_FLAG;
return 0;
return s->ass_ctx ? 0 : AVERROR_INVALIDDATA;
fail:
mov_text_encode_close(avctx);
return ret;
}
// Start a new style box if needed
......@@ -244,8 +375,9 @@ static int mov_text_style_start(MovTextContext *s)
if (s->style_attributes_temp->style_start == s->text_pos)
// Still at same text pos, use same entry
return 1;
if (s->style_attributes_temp->style_flag != s->d.style_flag ||
s->style_attributes_temp->style_color != s->d.style_color ||
if (s->style_attributes_temp->style_flag != s->d.style_flag ||
s->style_attributes_temp->style_color != s->d.style_color ||
s->style_attributes_temp->style_fontID != s->d.style_fontID ||
s->style_attributes_temp->style_fontsize != s->d.style_fontsize) {
// last style != defaults, end the style entry and start a new one
s->box_flags |= STYL_BOX;
......@@ -370,6 +502,33 @@ static void mov_text_alpha_cb(void *priv, int alpha, int alpha_id)
mov_text_alpha_set(s, 255 - alpha);
}
static uint16_t find_font_id(MovTextContext * s, const char * name)
{
int i;
for (i = 0; i < s->font_count; i++) {
if (!strcmp(name, s->fonts[i]))
return i + 1;
}
return 1;
}
static void mov_text_font_name_set(MovTextContext *s, const char *name)
{
int fontID = find_font_id(s, name);
if (!s->style_attributes_temp ||
s->style_attributes_temp->style_fontID == fontID) {
// color hasn't changed
return;
}
if (mov_text_style_start(s))
s->style_attributes_temp->style_fontID = fontID;
}
static void mov_text_font_name_cb(void *priv, const char *name)
{
mov_text_font_name_set((MovTextContext*)priv, name);
}
static void mov_text_font_size_set(MovTextContext *s, int size)
{
if (!s->style_attributes_temp ||
......@@ -407,6 +566,7 @@ static void mov_text_ass_style_set(MovTextContext *s, ASSStyle *style)
alpha = 255 - ((uint32_t)style->primary_color >> 24);
mov_text_alpha_set(s, alpha);
mov_text_font_size_set(s, style->font_size);
mov_text_font_name_set(s, style->font_name);
} else {
// End current style record, go back to defaults
mov_text_style_start(s);
......@@ -478,6 +638,7 @@ static const ASSCodesCallbacks mov_text_callbacks = {
.style = mov_text_style_cb,
.color = mov_text_color_cb,
.alpha = mov_text_alpha_cb,
.font_name = mov_text_font_name_cb,
.font_size = mov_text_font_size_cb,
.cancel_overrides = mov_text_cancel_overrides_cb,
.end = mov_text_end_cb,
......@@ -555,14 +716,6 @@ exit:
return length;
}
static int mov_text_encode_close(AVCodecContext *avctx)
{
MovTextContext *s = avctx->priv_data;
ff_ass_split_free(s->ass_ctx);
av_bprint_finalize(&s->buffer, NULL);
return 0;
}
AVCodec ff_movtext_encoder = {
.name = "mov_text",
.long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
......
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