#define UNSET_FLAG(var, val) ( (var) &= ~( 1 << (val)) )
#define CHECK_FLAG(var, val) ( (var) & ( 1 << (val)) )
+static const AVRational ass_tb = {1, 100};
+
/*
* TODO list
* 1) handle font and color completely
enum cc_mode {
CCMODE_POPON,
CCMODE_PAINTON,
- CCMODE_ROLLUP_2,
- CCMODE_ROLLUP_3,
- CCMODE_ROLLUP_4,
+ CCMODE_ROLLUP,
CCMODE_TEXT,
};
/* total 32 entries */
};
-/* 0-255 needs 256 spaces */
-static const uint8_t parity_table[256] = { 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 0, 1, 1, 0, 1, 0, 0, 1,
- 1, 0, 0, 1, 0, 1, 1, 0 };
-
struct Screen {
/* +1 is used to compensate null character of string */
uint8_t characters[SCREEN_ROWS][SCREEN_COLUMNS+1];
typedef struct CCaptionSubContext {
AVClass *class;
+ int real_time;
struct Screen screen[2];
int active_screen;
uint8_t cursor_row;
uint8_t cursor_color;
uint8_t cursor_font;
AVBPrint buffer;
- int screen_changed;
+ int buffer_changed;
int rollup;
- enum cc_mode mode;
+ enum cc_mode mode;
int64_t start_time;
/* visible screen time */
int64_t startv_time;
int64_t end_time;
+ int screen_touched;
+ int64_t last_real_time;
char prev_cmd[2];
/* buffer to store pkt data */
AVBufferRef *pktbuf;
av_bprint_init(&ctx->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
/* taking by default roll up to 2 */
- ctx->mode = CCMODE_ROLLUP_2;
+ ctx->mode = CCMODE_ROLLUP;
ctx->rollup = 2;
- ret = ff_ass_subtitle_header_default(avctx);
+ ret = ff_ass_subtitle_header(avctx, "Monospace",
+ ASS_DEFAULT_FONT_SIZE,
+ ASS_DEFAULT_COLOR,
+ ASS_DEFAULT_BACK_COLOR,
+ ASS_DEFAULT_BOLD,
+ ASS_DEFAULT_ITALIC,
+ ASS_DEFAULT_UNDERLINE,
+ 3,
+ ASS_DEFAULT_ALIGNMENT);
if (ret < 0) {
return ret;
}
return 0;
}
+static void flush_decoder(AVCodecContext *avctx)
+{
+ CCaptionSubContext *ctx = avctx->priv_data;
+ ctx->screen[0].row_used = 0;
+ ctx->screen[1].row_used = 0;
+ ctx->prev_cmd[0] = 0;
+ ctx->prev_cmd[1] = 0;
+ ctx->mode = CCMODE_ROLLUP;
+ ctx->rollup = 2;
+ ctx->cursor_row = 0;
+ ctx->cursor_column = 0;
+ ctx->cursor_font = 0;
+ ctx->cursor_color = 0;
+ ctx->active_screen = 0;
+ ctx->last_real_time = 0;
+ ctx->screen_touched = 0;
+ ctx->buffer_changed = 0;
+ av_bprint_clear(&ctx->buffer);
+}
+
/**
* @param ctx closed caption context just to print log
*/
-static int write_char(CCaptionSubContext *ctx, char *row, uint8_t col, char ch)
+static int write_char(CCaptionSubContext *ctx, struct Screen *screen, char ch)
{
+ uint8_t col = ctx->cursor_column;
+ char *row = screen->characters[ctx->cursor_row];
+ char *font = screen->fonts[ctx->cursor_row];
+
if (col < SCREEN_COLUMNS) {
row[col] = ch;
+ font[col] = ctx->cursor_font;
+ if (ch) ctx->cursor_column++;
return 0;
}
/* We have extra space at end only for null character */
return 0;
}
else {
- av_log(ctx, AV_LOG_WARNING,"Data Ignored since exceeding screen width\n");
+ av_log(ctx, AV_LOG_WARNING, "Data Ignored since exceeding screen width\n");
return AVERROR_INVALIDDATA;
}
}
// if EIA-608 data then verify parity.
if (cc_type==0 || cc_type==1) {
- if (!parity_table[cc_data_pair[2]]) {
+ if (!av_parity(cc_data_pair[2])) {
return AVERROR_INVALIDDATA;
}
- if (!parity_table[cc_data_pair[1]]) {
+ if (!av_parity(cc_data_pair[1])) {
cc_data_pair[1]=0x7F;
}
}
// use Inactive screen
return ctx->screen + !ctx->active_screen;
case CCMODE_PAINTON:
- case CCMODE_ROLLUP_2:
- case CCMODE_ROLLUP_3:
- case CCMODE_ROLLUP_4:
+ case CCMODE_ROLLUP:
case CCMODE_TEXT:
// use active screen
return ctx->screen + ctx->active_screen;
*/
keep_lines = FFMIN(ctx->cursor_row + 1, ctx->rollup);
- for (i = 0; i < ctx->cursor_row - keep_lines; i++)
+ for (i = 0; i < SCREEN_ROWS; i++) {
+ if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row)
+ continue;
UNSET_FLAG(screen->row_used, i);
-
+ }
for (i = 0; i < keep_lines && screen->row_used; i++) {
const int i_row = ctx->cursor_row - keep_lines + i + 1;
memcpy(screen->fonts[i_row], screen->fonts[i_row+1], SCREEN_COLUMNS);
if (CHECK_FLAG(screen->row_used, i_row + 1))
SET_FLAG(screen->row_used, i_row);
-
}
+
UNSET_FLAG(screen->row_used, ctx->cursor_row);
}
-static int reap_screen(CCaptionSubContext *ctx, int64_t pts)
+static int capture_screen(CCaptionSubContext *ctx)
{
int i;
- int ret = 0;
struct Screen *screen = ctx->screen + ctx->active_screen;
- ctx->start_time = ctx->startv_time;
+ enum cc_font prev_font = CCFONT_REGULAR;
+ av_bprint_clear(&ctx->buffer);
for (i = 0; screen->row_used && i < SCREEN_ROWS; i++)
{
- if (CHECK_FLAG(screen->row_used,i)) {
- char *str = screen->characters[i];
- /* skip space */
- while (*str == ' ')
- str++;
-
- av_bprintf(&ctx->buffer, "%s\\N", str);
- ret = av_bprint_is_complete(&ctx->buffer);
- if (ret == 0) {
- ret = AVERROR(ENOMEM);
- break;
+ if (CHECK_FLAG(screen->row_used, i)) {
+ const char *row = screen->characters[i];
+ const char *font = screen->fonts[i];
+ int j = 0;
+
+ /* skip leading space */
+ while (row[j] == ' ')
+ j++;
+
+ for (; j < SCREEN_COLUMNS; j++) {
+ const char *e_tag = "", *s_tag = "";
+
+ if (row[j] == 0)
+ break;
+
+ if (prev_font != font[j]) {
+ switch (prev_font) {
+ case CCFONT_ITALICS:
+ e_tag = "{\\i0}";
+ break;
+ case CCFONT_UNDERLINED:
+ e_tag = "{\\u0}";
+ break;
+ case CCFONT_UNDERLINED_ITALICS:
+ e_tag = "{\\u0}{\\i0}";
+ break;
+ }
+ switch (font[j]) {
+ case CCFONT_ITALICS:
+ s_tag = "{\\i1}";
+ break;
+ case CCFONT_UNDERLINED:
+ s_tag = "{\\u1}";
+ break;
+ case CCFONT_UNDERLINED_ITALICS:
+ s_tag = "{\\u1}{\\i1}";
+ break;
+ }
+ }
+ prev_font = font[j];
+ av_bprintf(&ctx->buffer, "%s%s%c", e_tag, s_tag, row[j]);
}
+ av_bprintf(&ctx->buffer, "\\N");
}
-
}
+ if (!av_bprint_is_complete(&ctx->buffer))
+ return AVERROR(ENOMEM);
if (screen->row_used && ctx->buffer.len >= 2) {
ctx->buffer.len -= 2;
ctx->buffer.str[ctx->buffer.len] = 0;
}
+ ctx->buffer_changed = 1;
+ return 0;
+}
+
+static int reap_screen(CCaptionSubContext *ctx, int64_t pts)
+{
+ ctx->start_time = ctx->startv_time;
ctx->startv_time = pts;
ctx->end_time = pts;
- return ret;
+ return capture_screen(ctx);
}
static void handle_textattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
{
int i = lo - 0x20;
- int ret;
struct Screen *screen = get_writing_screen(ctx);
- char *row = screen->characters[ctx->cursor_row];
if (i >= 32)
return;
ctx->cursor_color = pac2_attribs[i][0];
ctx->cursor_font = pac2_attribs[i][1];
- SET_FLAG(screen->row_used,ctx->cursor_row);
- ret = write_char(ctx, row, ctx->cursor_column, ' ');
- if (ret == 0)
- ctx->cursor_column++;
+ SET_FLAG(screen->row_used, ctx->cursor_row);
+ write_char(ctx, screen, ' ');
}
static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
};
const int index = ( (hi<<1) & 0x0e) | ( (lo>>5) & 0x01 );
struct Screen *screen = get_writing_screen(ctx);
- char *row;
- int indent, i, ret;
+ int indent, i;
if (row_map[index] <= 0) {
- av_log(ctx, AV_LOG_DEBUG,"Invalid pac index encountered\n");
+ av_log(ctx, AV_LOG_DEBUG, "Invalid pac index encountered\n");
return;
}
ctx->cursor_font = pac2_attribs[lo][1];
ctx->cursor_column = 0;
indent = pac2_attribs[lo][2];
- row = screen->characters[ctx->cursor_row];
for (i = 0; i < indent; i++) {
- ret = write_char(ctx, row, ctx->cursor_column, ' ');
- if (ret == 0)
- ctx->cursor_column++;
+ write_char(ctx, screen, ' ');
}
}
/**
* @param pts it is required to set end time
*/
-static int handle_edm(CCaptionSubContext *ctx, int64_t pts)
+static void handle_edm(CCaptionSubContext *ctx, int64_t pts)
{
- int ret = 0;
struct Screen *screen = ctx->screen + ctx->active_screen;
- reap_screen(ctx, pts);
+ // In buffered mode, keep writing to screen until it is wiped.
+ // Before wiping the display, capture contents to emit subtitle.
+ if (!ctx->real_time)
+ reap_screen(ctx, pts);
+
screen->row_used = 0;
- ctx->screen_changed = 1;
- return ret;
+
+ // In realtime mode, emit an empty caption so the last one doesn't
+ // stay on the screen.
+ if (ctx->real_time)
+ reap_screen(ctx, pts);
}
-static int handle_eoc(CCaptionSubContext *ctx, int64_t pts)
+static void handle_eoc(CCaptionSubContext *ctx, int64_t pts)
{
- int ret;
- ret = handle_edm(ctx,pts);
+ // In buffered mode, we wait til the *next* EOC and
+ // reap what was already on the screen since the last EOC.
+ if (!ctx->real_time)
+ handle_edm(ctx,pts);
+
ctx->active_screen = !ctx->active_screen;
ctx->cursor_column = 0;
- return ret;
+
+ // In realtime mode, we display the buffered contents (after
+ // flipping the buffer to active above) as soon as EOC arrives.
+ if (ctx->real_time)
+ reap_screen(ctx, pts);
}
static void handle_delete_end_of_row(CCaptionSubContext *ctx, char hi, char lo)
{
struct Screen *screen = get_writing_screen(ctx);
- char *row = screen->characters[ctx->cursor_row];
- write_char(ctx, row, ctx->cursor_column, 0);
+ write_char(ctx, screen, 0);
}
static void handle_char(CCaptionSubContext *ctx, char hi, char lo, int64_t pts)
{
struct Screen *screen = get_writing_screen(ctx);
- char *row = screen->characters[ctx->cursor_row];
- int ret;
- SET_FLAG(screen->row_used,ctx->cursor_row);
+ SET_FLAG(screen->row_used, ctx->cursor_row);
- ret = write_char(ctx, row, ctx->cursor_column, hi);
- if (ret == 0)
- ctx->cursor_column++;
+ write_char(ctx, screen, hi);
if (lo) {
- ret = write_char(ctx, row, ctx->cursor_column, lo);
- if (ret == 0)
- ctx->cursor_column++;
+ write_char(ctx, screen, lo);
}
- write_char(ctx, row, ctx->cursor_column, 0);
+ write_char(ctx, screen, 0);
+
+ if (ctx->mode != CCMODE_POPON)
+ ctx->screen_touched = 1;
/* reset prev command since character can repeat */
ctx->prev_cmd[0] = 0;
ff_dlog(ctx, "(%c)\n", hi);
}
-static int process_cc608(CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint8_t lo)
+static void process_cc608(CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint8_t lo)
{
- int ret = 0;
if (hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) {
/* ignore redundant command */
- } else if ( (hi == 0x10 && (lo >= 0x40 || lo <= 0x5f)) ||
+ } else if ( (hi == 0x10 && (lo >= 0x40 && lo <= 0x5f)) ||
( (hi >= 0x11 && hi <= 0x17) && (lo >= 0x40 && lo <= 0x7f) ) ) {
handle_pac(ctx, hi, lo);
} else if ( ( hi == 0x11 && lo >= 0x20 && lo <= 0x2f ) ||
handle_delete_end_of_row(ctx, hi, lo);
break;
case 0x25:
- ctx->rollup = 2;
- ctx->mode = CCMODE_ROLLUP_2;
- break;
case 0x26:
- ctx->rollup = 3;
- ctx->mode = CCMODE_ROLLUP_3;
- break;
case 0x27:
- ctx->rollup = 4;
- ctx->mode = CCMODE_ROLLUP_4;
+ ctx->rollup = lo - 0x23;
+ ctx->mode = CCMODE_ROLLUP;
break;
case 0x29:
/* resume direct captioning */
break;
case 0x2c:
/* erase display memory */
- ret = handle_edm(ctx, pts);
+ handle_edm(ctx, pts);
break;
case 0x2d:
/* carriage return */
ff_dlog(ctx, "carriage return\n");
- reap_screen(ctx, pts);
+ if (!ctx->real_time)
+ reap_screen(ctx, pts);
roll_up(ctx);
- ctx->screen_changed = 1;
ctx->cursor_column = 0;
break;
+ case 0x2e:
+ /* erase buffered (non displayed) memory */
+ // Only in realtime mode. In buffered mode, we re-use the inactive screen
+ // for our own buffering.
+ if (ctx->real_time) {
+ struct Screen *screen = ctx->screen + !ctx->active_screen;
+ screen->row_used = 0;
+ }
+ break;
case 0x2f:
/* end of caption */
ff_dlog(ctx, "handle_eoc\n");
- ret = handle_eoc(ctx, pts);
+ handle_eoc(ctx, pts);
break;
default:
ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
break;
}
- } else if (hi>=0x20) {
+ } else if (hi >= 0x20) {
/* Standard characters (always in pairs) */
handle_char(ctx, hi, lo, pts);
} else {
/* set prev command */
ctx->prev_cmd[0] = hi;
ctx->prev_cmd[1] = lo;
-
- return ret;
}
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
if (ctx->pktbuf->size < len) {
ret = av_buffer_realloc(&ctx->pktbuf, len);
if (ret < 0) {
- av_log(ctx, AV_LOG_WARNING, "Insufficient Memory of %d truncated to %d\n",len, ctx->pktbuf->size);
+ av_log(ctx, AV_LOG_WARNING, "Insufficient Memory of %d truncated to %d\n", len, ctx->pktbuf->size);
len = ctx->pktbuf->size;
ret = 0;
}
continue;
else
process_cc608(ctx, avpkt->pts, *(bptr + i + 1) & 0x7f, *(bptr + i + 2) & 0x7f);
- if (ctx->screen_changed && *ctx->buffer.str)
+
+ if (!ctx->buffer_changed)
+ continue;
+ ctx->buffer_changed = 0;
+
+ if (*ctx->buffer.str || ctx->real_time)
{
- int start_time = av_rescale_q(ctx->start_time, avctx->time_base, (AVRational){ 1, 100 });
- int end_time = av_rescale_q(ctx->end_time, avctx->time_base, (AVRational){ 1, 100 });
+ int64_t sub_pts = ctx->real_time ? avpkt->pts : ctx->start_time;
+ int start_time = av_rescale_q(sub_pts, avctx->time_base, ass_tb);
+ int duration = -1;
+ if (!ctx->real_time) {
+ int end_time = av_rescale_q(ctx->end_time, avctx->time_base, ass_tb);
+ duration = end_time - start_time;
+ }
ff_dlog(ctx, "cdp writing data (%s)\n",ctx->buffer.str);
- ret = ff_ass_add_rect_bprint(sub, &ctx->buffer, start_time, end_time - start_time);
+ ret = ff_ass_add_rect_bprint(sub, &ctx->buffer, start_time, duration);
if (ret < 0)
return ret;
- sub->pts = av_rescale_q(ctx->start_time, avctx->time_base, AV_TIME_BASE_Q);
- ctx->screen_changed = 0;
- av_bprint_clear(&ctx->buffer);
+ sub->pts = av_rescale_q(sub_pts, avctx->time_base, AV_TIME_BASE_Q);
+ ctx->buffer_changed = 0;
+ ctx->last_real_time = avpkt->pts;
+ ctx->screen_touched = 0;
}
}
+ if (ctx->real_time && ctx->screen_touched &&
+ avpkt->pts > ctx->last_real_time + av_rescale_q(20, ass_tb, avctx->time_base)) {
+ int start_time;
+ ctx->last_real_time = avpkt->pts;
+ ctx->screen_touched = 0;
+
+ capture_screen(ctx);
+ ctx->buffer_changed = 0;
+
+ start_time = av_rescale_q(avpkt->pts, avctx->time_base, ass_tb);
+ ret = ff_ass_add_rect_bprint(sub, &ctx->buffer, start_time, -1);
+ if (ret < 0)
+ return ret;
+ sub->pts = av_rescale_q(avpkt->pts, avctx->time_base, AV_TIME_BASE_Q);
+ }
+
*got_sub = sub->num_rects > 0;
return ret;
}
+#define OFFSET(x) offsetof(CCaptionSubContext, x)
+#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
+ { "real_time", "emit subtitle events as they are decoded for real-time display", OFFSET(real_time), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, SD },
{NULL}
};
.priv_data_size = sizeof(CCaptionSubContext),
.init = init_decoder,
.close = close_decoder,
+ .flush = flush_decoder,
.decode = decode,
.priv_class = &ccaption_dec_class,
};
projects / ffmpeg / blobdiff