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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: Philip Langdale <philipl@overt.org>
This commit is contained in:
John Stebbins
Philip Langdale
parent
dbdbcbf384
commit
1f8278ee24
@ -80,6 +80,8 @@ typedef struct {
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StyleBox d;
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uint16_t text_pos;
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uint16_t byte_count;
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char ** fonts;
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int font_count;
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} MovTextContext;
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typedef struct {
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@ -172,69 +174,198 @@ static const Box box_types[] = {
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const static size_t box_count = FF_ARRAY_ELEMS(box_types);
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static av_cold int mov_text_encode_init(AVCodecContext *avctx)
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static int mov_text_encode_close(AVCodecContext *avctx)
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{
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/*
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* For now, we'll use a fixed default style. When we add styling
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* support, this will be generated from the ASS style.
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*/
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static const uint8_t text_sample_entry[] = {
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MovTextContext *s = avctx->priv_data;
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int i;
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ff_ass_split_free(s->ass_ctx);
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if (s->style_attributes) {
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for (i = 0; i < s->count; i++) {
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av_freep(&s->style_attributes[i]);
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}
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av_freep(&s->style_attributes);
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}
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av_freep(&s->fonts);
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av_freep(&s->style_attributes_temp);
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av_bprint_finalize(&s->buffer, NULL);
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return 0;
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}
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static int encode_sample_description(AVCodecContext *avctx)
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{
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ASS * ass;
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ASSStyle * style;
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int i, j;
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uint32_t tsmb_size, tsmb_type, back_color, style_color;
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uint16_t style_start, style_end, fontID, count;
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int font_names_total_len = 0;
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MovTextContext *s = avctx->priv_data;
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static const uint8_t display_and_justification[] = {
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0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags
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0x01, // int8_t horizontal-justification
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0xFF, // int8_t vertical-justification
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0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
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// BoxRecord {
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};
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// 0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
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static const uint8_t box_record[] = {
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// BoxRecord {
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0x00, 0x00, // int16_t top
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0x00, 0x00, // int16_t left
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0x00, 0x00, // int16_t bottom
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0x00, 0x00, // int16_t right
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// };
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// StyleRecord {
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0x00, 0x00, // uint16_t startChar
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0x00, 0x00, // uint16_t endChar
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0x00, 0x01, // uint16_t font-ID
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0x00, // uint8_t face-style-flags
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0x12, // uint8_t font-size
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0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
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// };
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// FontTableBox {
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0x00, 0x00, 0x00, 0x12, // uint32_t size
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'f', 't', 'a', 'b', // uint8_t name[4]
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0x00, 0x01, // uint16_t entry-count
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// FontRecord {
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0x00, 0x01, // uint16_t font-ID
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0x05, // uint8_t font-name-length
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'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
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// };
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// };
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// };
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};
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// StyleRecord {
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// 0x00, 0x00, // uint16_t startChar
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// 0x00, 0x00, // uint16_t endChar
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// 0x00, 0x01, // uint16_t font-ID
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// 0x00, // uint8_t face-style-flags
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// 0x12, // uint8_t font-size
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// 0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
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// };
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// FontTableBox {
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// 0x00, 0x00, 0x00, 0x12, // uint32_t size
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// 'f', 't', 'a', 'b', // uint8_t name[4]
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// 0x00, 0x01, // uint16_t entry-count
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// FontRecord {
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// 0x00, 0x01, // uint16_t font-ID
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// 0x05, // uint8_t font-name-length
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// 'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
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// };
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// };
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MovTextContext *s = avctx->priv_data;
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s->avctx = avctx;
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s->style_attributes_temp = av_mallocz(sizeof(*s->style_attributes_temp));
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if (!s->style_attributes_temp) {
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return AVERROR(ENOMEM);
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// Populate sample description from ASS header
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ass = (ASS*)s->ass_ctx;
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style = ff_ass_style_get(s->ass_ctx, "Default");
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if (!style && ass->styles_count) {
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style = &ass->styles[0];
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}
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avctx->extradata_size = sizeof text_sample_entry;
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avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!avctx->extradata)
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return AVERROR(ENOMEM);
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av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
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memcpy(avctx->extradata, text_sample_entry, avctx->extradata_size);
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s->ass_ctx = ff_ass_split(avctx->subtitle_header);
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// TODO: Initialize from ASS style record
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s->d.style_fontID = DEFAULT_STYLE_FONT_ID;
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s->d.style_fontsize = DEFAULT_STYLE_FONTSIZE;
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s->d.style_color = DEFAULT_STYLE_COLOR;
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s->d.style_flag = DEFAULT_STYLE_FLAG;
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if (style) {
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s->d.style_fontsize = style->font_size;
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s->d.style_color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8 |
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255 - ((uint32_t)style->primary_color >> 24);
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s->d.style_flag = (!!style->bold * STYLE_FLAG_BOLD) |
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(!!style->italic * STYLE_FLAG_ITALIC) |
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(!!style->underline * STYLE_FLAG_UNDERLINE);
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back_color = (BGR_TO_RGB(style->back_color & 0xffffff) << 8) |
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(255 - ((uint32_t)style->back_color >> 24));
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}
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return s->ass_ctx ? 0 : AVERROR_INVALIDDATA;
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av_bprint_append_any(&s->buffer, display_and_justification,
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sizeof(display_and_justification));
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back_color = AV_RB32(&back_color);
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av_bprint_append_any(&s->buffer, &back_color, 4);
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// BoxRecord {
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av_bprint_append_any(&s->buffer, box_record, sizeof(box_record));
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// };
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// StyleRecord {
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style_start = AV_RB16(&s->d.style_start);
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style_end = AV_RB16(&s->d.style_end);
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fontID = AV_RB16(&s->d.style_fontID);
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style_color = AV_RB32(&s->d.style_color);
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av_bprint_append_any(&s->buffer, &style_start, 2);
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av_bprint_append_any(&s->buffer, &style_end, 2);
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av_bprint_append_any(&s->buffer, &fontID, 2);
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av_bprint_append_any(&s->buffer, &s->d.style_flag, 1);
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av_bprint_append_any(&s->buffer, &s->d.style_fontsize, 1);
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av_bprint_append_any(&s->buffer, &style_color, 4);
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// };
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// Build font table
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// We can't build a complete font table since that would require
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// scanning all dialogs first. But we can at least fill in what
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// is avaiable in the ASS header
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if (style && ass->styles_count) {
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// Find unique font names
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av_dynarray_add(&s->fonts, &s->font_count, style->font_name);
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font_names_total_len += strlen(style->font_name);
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for (i = 0; i < ass->styles_count; i++) {
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int found = 0;
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for (j = 0; j < s->font_count; j++) {
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if (!strcmp(s->fonts[j], ass->styles[i].font_name)) {
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found = 1;
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break;
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}
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}
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if (!found) {
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av_dynarray_add(&s->fonts, &s->font_count,
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ass->styles[i].font_name);
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font_names_total_len += strlen(ass->styles[i].font_name);
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}
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}
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} else
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av_dynarray_add(&s->fonts, &s->font_count, (char*)"Serif");
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// FontTableBox {
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tsmb_size = SIZE_ADD + 3 * s->font_count + font_names_total_len;
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tsmb_size = AV_RB32(&tsmb_size);
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tsmb_type = MKTAG('f','t','a','b');
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count = AV_RB16(&s->font_count);
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av_bprint_append_any(&s->buffer, &tsmb_size, 4);
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av_bprint_append_any(&s->buffer, &tsmb_type, 4);
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av_bprint_append_any(&s->buffer, &count, 2);
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// FontRecord {
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for (i = 0; i < s->font_count; i++) {
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int len;
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fontID = i + 1;
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fontID = AV_RB16(&fontID);
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av_bprint_append_any(&s->buffer, &fontID, 2);
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len = strlen(s->fonts[i]);
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av_bprint_append_any(&s->buffer, &len, 1);
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av_bprint_append_any(&s->buffer, s->fonts[i], len);
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}
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// };
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// };
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if (!av_bprint_is_complete(&s->buffer)) {
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return AVERROR(ENOMEM);
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}
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avctx->extradata_size = s->buffer.len;
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avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!avctx->extradata) {
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return AVERROR(ENOMEM);
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}
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memcpy(avctx->extradata, s->buffer.str, avctx->extradata_size);
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av_bprint_clear(&s->buffer);
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return 0;
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}
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static av_cold int mov_text_encode_init(AVCodecContext *avctx)
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{
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int ret;
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MovTextContext *s = avctx->priv_data;
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s->avctx = avctx;
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av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
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s->style_attributes_temp = av_mallocz(sizeof(*s->style_attributes_temp));
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if (!s->style_attributes_temp) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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s->ass_ctx = ff_ass_split(avctx->subtitle_header);
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if (!s->ass_ctx) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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ret = encode_sample_description(avctx);
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if (ret < 0)
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goto fail;
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return 0;
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fail:
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mov_text_encode_close(avctx);
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return ret;
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}
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// Start a new style box if needed
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@ -244,8 +375,9 @@ static int mov_text_style_start(MovTextContext *s)
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if (s->style_attributes_temp->style_start == s->text_pos)
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// Still at same text pos, use same entry
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return 1;
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if (s->style_attributes_temp->style_flag != s->d.style_flag ||
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s->style_attributes_temp->style_color != s->d.style_color ||
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if (s->style_attributes_temp->style_flag != s->d.style_flag ||
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s->style_attributes_temp->style_color != s->d.style_color ||
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s->style_attributes_temp->style_fontID != s->d.style_fontID ||
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s->style_attributes_temp->style_fontsize != s->d.style_fontsize) {
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// last style != defaults, end the style entry and start a new one
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s->box_flags |= STYL_BOX;
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@ -370,6 +502,33 @@ static void mov_text_alpha_cb(void *priv, int alpha, int alpha_id)
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mov_text_alpha_set(s, 255 - alpha);
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}
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static uint16_t find_font_id(MovTextContext * s, const char * name)
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{
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int i;
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for (i = 0; i < s->font_count; i++) {
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if (!strcmp(name, s->fonts[i]))
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return i + 1;
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}
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return 1;
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}
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static void mov_text_font_name_set(MovTextContext *s, const char *name)
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{
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int fontID = find_font_id(s, name);
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if (!s->style_attributes_temp ||
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s->style_attributes_temp->style_fontID == fontID) {
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// color hasn't changed
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return;
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}
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if (mov_text_style_start(s))
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s->style_attributes_temp->style_fontID = fontID;
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}
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static void mov_text_font_name_cb(void *priv, const char *name)
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{
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mov_text_font_name_set((MovTextContext*)priv, name);
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}
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static void mov_text_font_size_set(MovTextContext *s, int size)
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{
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if (!s->style_attributes_temp ||
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@ -407,6 +566,7 @@ static void mov_text_ass_style_set(MovTextContext *s, ASSStyle *style)
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alpha = 255 - ((uint32_t)style->primary_color >> 24);
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mov_text_alpha_set(s, alpha);
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mov_text_font_size_set(s, style->font_size);
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mov_text_font_name_set(s, style->font_name);
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} else {
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// End current style record, go back to defaults
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mov_text_style_start(s);
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@ -478,6 +638,7 @@ static const ASSCodesCallbacks mov_text_callbacks = {
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.style = mov_text_style_cb,
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.color = mov_text_color_cb,
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.alpha = mov_text_alpha_cb,
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.font_name = mov_text_font_name_cb,
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.font_size = mov_text_font_size_cb,
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.cancel_overrides = mov_text_cancel_overrides_cb,
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.end = mov_text_end_cb,
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@ -555,14 +716,6 @@ exit:
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return length;
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}
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static int mov_text_encode_close(AVCodecContext *avctx)
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{
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MovTextContext *s = avctx->priv_data;
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ff_ass_split_free(s->ass_ctx);
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av_bprint_finalize(&s->buffer, NULL);
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return 0;
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}
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AVCodec ff_movtext_encoder = {
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.name = "mov_text",
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.long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
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