*/
#include "avcodec.h"
+#include "libavcodec/ass.h"
#include "libavutil/opt.h"
+#include "libavutil/bprint.h"
#include "libavutil/intreadwrite.h"
#include <libzvbi.h>
#define VBI_G(rgba) (((rgba) >> 8) & 0xFF)
#define VBI_B(rgba) (((rgba) >> 16) & 0xFF)
#define VBI_A(rgba) (((rgba) >> 24) & 0xFF)
+#define MAX_BUFFERED_PAGES 25
+
+typedef struct TeletextPage
+{
+ AVSubtitleRect *sub_rect;
+ int pgno;
+ int subno;
+ int64_t pts;
+} TeletextPage;
/* main data structure */
typedef struct TeletextContext
char *pgno;
int x_offset;
int y_offset;
- char *format;
- int format_id; /* 0 = bitmap, 1 = text */
+ int format_id; /* 0 = bitmap, 1 = text/ass */
int chop_top;
int sub_duration; /* in msec */
int transparent_bg;
int chop_spaces;
int lines_processed;
- AVSubtitleRect *sub_rect;
+ TeletextPage *pages;
+ int nb_pages;
+ int64_t pts;
+ int handler_ret;
vbi_decoder * vbi;
vbi_dvb_demux * dx;
return len;
}
+static void
+subtitle_rect_free(AVSubtitleRect **sub_rect)
+{
+ av_freep(&(*sub_rect)->pict.data[0]);
+ av_freep(&(*sub_rect)->pict.data[1]);
+ av_freep(&(*sub_rect)->ass);
+ av_freep(sub_rect);
+}
+
+static int
+create_ass_text(TeletextContext *ctx, const char *text, char **ass)
+{
+ int ret;
+ AVBPrint buf, buf2;
+ const int ts_start = av_rescale_q(ctx->pts, AV_TIME_BASE_Q, (AVRational){1, 100});
+ const int ts_duration = av_rescale_q(ctx->sub_duration, (AVRational){1, 1000}, (AVRational){1, 100});
+
+ /* First we escape the plain text into buf. */
+ av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
+ ff_ass_bprint_text_event(&buf, text, strlen(text), "", 0);
+
+ if (!av_bprint_is_complete(&buf)) {
+ av_bprint_finalize(&buf, NULL);
+ return AVERROR(ENOMEM);
+ }
+
+ /* Then we create the ass dialog line in buf2 from the escaped text in buf. */
+ av_bprint_init(&buf2, 0, AV_BPRINT_SIZE_UNLIMITED);
+ ff_ass_bprint_dialog(&buf2, buf.str, ts_start, ts_duration, 0);
+ av_bprint_finalize(&buf, NULL);
+
+ if (!av_bprint_is_complete(&buf2)) {
+ av_bprint_finalize(&buf2, NULL);
+ return AVERROR(ENOMEM);
+ }
+
+ if ((ret = av_bprint_finalize(&buf2, ass)) < 0)
+ return ret;
+
+ return 0;
+}
+
// draw a page as text
static int
-gen_sub_text(TeletextContext *ctx, vbi_page *page, int chop_top)
+gen_sub_text(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
{
- AVSubtitleRect *sub_rect = ctx->sub_rect;
- char *text;
const char *in;
- char *out;
+ AVBPrint buf;
char *vbi_text = av_malloc(TEXT_MAXSZ);
int sz;
}
vbi_text[sz] = '\0';
in = vbi_text;
- out = text = av_malloc(TEXT_MAXSZ);
- if (!text) {
- av_free(vbi_text);
- return AVERROR(ENOMEM);
- }
+ av_bprint_init(&buf, 0, TEXT_MAXSZ);
+
if (ctx->chop_spaces) {
for (;;) {
int nl, sz;
break;
// skip trailing spaces
sz = chop_spaces_utf8(in, nl);
- memcpy(out, in, sz);
- out += sz;
- *out++ = '\n';
+ av_bprint_append_data(&buf, in, sz);
+ av_bprintf(&buf, "\n");
in += nl;
}
} else {
- strcpy(text, vbi_text);
- out += sz;
- *out++ = '\n';
+ av_bprintf(&buf, "%s\n", vbi_text);
}
av_free(vbi_text);
- *out = '\0';
- if (out > text) {
- sub_rect->type = SUBTITLE_TEXT;
- sub_rect->text = text;
- av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", text);
+
+ if (!av_bprint_is_complete(&buf)) {
+ av_bprint_finalize(&buf, NULL);
+ return AVERROR(ENOMEM);
+ }
+
+ if (buf.len) {
+ int ret;
+ sub_rect->type = SUBTITLE_ASS;
+ if ((ret = create_ass_text(ctx, buf.str, &sub_rect->ass)) < 0) {
+ av_bprint_finalize(&buf, NULL);
+ return ret;
+ }
+ av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
} else {
sub_rect->type = SUBTITLE_NONE;
- av_free(text);
}
+ av_bprint_finalize(&buf, NULL);
return 0;
}
static void
-fix_transparency(TeletextContext *ctx, vbi_page *page, int chop_top, uint8_t transparent_color, int resx, int resy)
+fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top, uint8_t transparent_color, int resx, int resy)
{
- AVSubtitleRect *sub_rect = ctx->sub_rect;
int iy;
// Hack for transparency, inspired by VLC code...
// draw a page as bitmap
static int
-gen_sub_bitmap(TeletextContext *ctx, vbi_page *page, int chop_top)
+gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
{
- AVSubtitleRect *sub_rect = ctx->sub_rect;
int resx = page->columns * 12;
int resy = (page->rows - chop_top) * 10;
uint8_t ci, cmax = 0;
0, chop_top, page->columns, page->rows - chop_top,
/*reveal*/ 1, /*flash*/ 1);
- fix_transparency(ctx, page, chop_top, cmax, resx, resy);
+ fix_transparency(ctx, sub_rect, page, chop_top, cmax, resx, resy);
sub_rect->x = ctx->x_offset;
sub_rect->y = ctx->y_offset;
sub_rect->w = resx;
handler(vbi_event *ev, void *user_data)
{
TeletextContext *ctx = user_data;
+ TeletextPage *new_pages;
vbi_page page;
int res;
char pgno_str[12];
if (strcmp(ctx->pgno, "*") && !strstr(ctx->pgno, pgno_str))
return;
+ if (ctx->handler_ret < 0)
+ return;
/* Fetch the page. */
res = vbi_fetch_vt_page(ctx->vbi, &page,
av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
page.columns, page.rows, chop_top);
- if (!ctx->sub_rect) {
- ctx->sub_rect = av_mallocz(sizeof(*ctx->sub_rect));
- if (ctx->sub_rect) {
- res = (ctx->format_id == 0) ?
- gen_sub_bitmap(ctx, &page, chop_top) :
- gen_sub_text (ctx, &page, chop_top);
- if (res)
- av_freep(&ctx->sub_rect);
+ if (ctx->nb_pages < MAX_BUFFERED_PAGES) {
+ if ((new_pages = av_realloc_array(ctx->pages, ctx->nb_pages + 1, sizeof(TeletextPage)))) {
+ TeletextPage *cur_page = new_pages + ctx->nb_pages;
+ ctx->pages = new_pages;
+ cur_page->sub_rect = av_mallocz(sizeof(*cur_page->sub_rect));
+ cur_page->pts = ctx->pts;
+ cur_page->pgno = ev->ev.ttx_page.pgno;
+ cur_page->subno = ev->ev.ttx_page.subno;
+ if (cur_page->sub_rect) {
+ res = (ctx->format_id == 0) ?
+ gen_sub_bitmap(ctx, cur_page->sub_rect, &page, chop_top) :
+ gen_sub_text (ctx, cur_page->sub_rect, &page, chop_top);
+ if (res < 0) {
+ av_freep(&cur_page->sub_rect);
+ ctx->handler_ret = res;
+ } else {
+ ctx->pages[ctx->nb_pages++] = *cur_page;
+ }
+ } else {
+ ctx->handler_ret = AVERROR(ENOMEM);
+ }
+ } else {
+ ctx->handler_ret = AVERROR(ENOMEM);
}
} else {
- // FIXME: Multiple teletext pages in a single packet, some kind of buffering should be done instead of dropping the page...
- av_log(ctx, AV_LOG_WARNING, "Missed page %s.%02x.\n", pgno_str, ev->ev.ttx_page.subno & 0xFF);
+ //TODO: If multiple packets contain more than one page, pages may got queued up, and this may happen...
+ av_log(ctx, AV_LOG_ERROR, "Buffered too many pages, dropping page %s.\n", pgno_str);
+ ctx->handler_ret = AVERROR(ENOSYS);
}
vbi_unref_page(&page);
TeletextContext *ctx = avctx->priv_data;
AVSubtitle *sub = data;
const uint8_t *buf = pkt->data;
- unsigned int left = pkt->size;
+ int left = pkt->size;
uint8_t pesheader[45] = {0x00, 0x00, 0x01, 0xbd, 0x00, 0x00, 0x85, 0x80, 0x24, 0x21, 0x00, 0x01, 0x00, 0x01};
int pesheader_size = sizeof(pesheader);
const uint8_t *pesheader_buf = pesheader;
+ int ret = 0;
if (!ctx->vbi) {
if (!(ctx->vbi = vbi_decoder_new()))
if (!ctx->dx && (!(ctx->dx = vbi_dvb_pes_demux_new (/* callback */ NULL, NULL))))
return AVERROR(ENOMEM);
- // We allow unreasonably big packets, even if the standard only allows a max size of 1472
- if ((pesheader_size + left) < 184 || (pesheader_size + left) > 65504 || (pesheader_size + left) % 184 != 0)
- return AVERROR_INVALIDDATA;
+ if (avctx->pkt_timebase.den && pkt->pts != AV_NOPTS_VALUE)
+ ctx->pts = av_rescale_q(pkt->pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
+
+ if (left) {
+ // We allow unreasonably big packets, even if the standard only allows a max size of 1472
+ if ((pesheader_size + left) < 184 || (pesheader_size + left) > 65504 || (pesheader_size + left) % 184 != 0)
+ return AVERROR_INVALIDDATA;
- memset(pesheader + 14, 0xff, pesheader_size - 14);
- AV_WB16(pesheader + 4, left + pesheader_size - 6);
+ memset(pesheader + 14, 0xff, pesheader_size - 14);
+ AV_WB16(pesheader + 4, left + pesheader_size - 6);
- /* PTS is deliberately left as 0 in the PES header, otherwise libzvbi uses
- * it to detect dropped frames. Unforunatey the guessed packet PTS values
- * (see mpegts demuxer) are not accurate enough to pass that test. */
- vbi_dvb_demux_cor(ctx->dx, ctx->sliced, 64, NULL, &pesheader_buf, &pesheader_size);
+ /* PTS is deliberately left as 0 in the PES header, otherwise libzvbi uses
+ * it to detect dropped frames. Unforunatey the guessed packet PTS values
+ * (see mpegts demuxer) are not accurate enough to pass that test. */
+ vbi_dvb_demux_cor(ctx->dx, ctx->sliced, 64, NULL, &pesheader_buf, &pesheader_size);
- while (left > 0) {
- int64_t pts = 0;
- unsigned int lines = vbi_dvb_demux_cor(ctx->dx, ctx->sliced, 64, &pts, &buf, &left);
+ ctx->handler_ret = pkt->size;
+
+ while (left > 0) {
+ int64_t pts = 0;
+ unsigned int lines = vbi_dvb_demux_cor(ctx->dx, ctx->sliced, 64, &pts, &buf, &left);
#ifdef DEBUG
- av_log(avctx, AV_LOG_DEBUG,
- "ctx=%p buf_size=%d left=%u lines=%u pts=%f pkt_pts=%f\n",
- ctx, pkt->size, left, lines, (double)pts/90000.0, (double)pkt->pts/90000.0);
+ av_log(avctx, AV_LOG_DEBUG,
+ "ctx=%p buf_size=%d left=%u lines=%u pts=%f pkt_pts=%f\n",
+ ctx, pkt->size, left, lines, (double)pts/90000.0, (double)pkt->pts/90000.0);
#endif
- if (lines > 0) {
+ if (lines > 0) {
#ifdef DEBUGx
- int i;
- for(i=0; i<lines; ++i)
- av_log(avctx, AV_LOG_DEBUG,
- "lines=%d id=%x\n", i, ctx->sliced[i].id);
+ int i;
+ for(i=0; i<lines; ++i)
+ av_log(avctx, AV_LOG_DEBUG,
+ "lines=%d id=%x\n", i, ctx->sliced[i].id);
#endif
- vbi_decode(ctx->vbi, ctx->sliced, lines, (double)pts/90000.0);
- ctx->lines_processed += lines;
+ vbi_decode(ctx->vbi, ctx->sliced, lines, (double)pts/90000.0);
+ ctx->lines_processed += lines;
+ }
}
+ ctx->pts = AV_NOPTS_VALUE;
+ ret = ctx->handler_ret;
}
+ if (ret < 0)
+ return ret;
+
// is there a subtitle to pass?
- if (ctx->sub_rect) {
- sub->format = (ctx->sub_rect->type == SUBTITLE_TEXT ? 1: 0);
+ if (ctx->nb_pages) {
+ int i;
+ sub->format = ctx->format_id;
sub->start_display_time = 0;
sub->end_display_time = ctx->sub_duration;
sub->num_rects = 0;
+ sub->pts = ctx->pages->pts;
- if (ctx->sub_rect->type != SUBTITLE_NONE) {
+ if (ctx->pages->sub_rect->type != SUBTITLE_NONE) {
sub->rects = av_malloc(sizeof(*sub->rects) * 1);
if (sub->rects) {
sub->num_rects = 1;
- sub->rects[0] = ctx->sub_rect;
+ sub->rects[0] = ctx->pages->sub_rect;
+ } else {
+ ret = AVERROR(ENOMEM);
}
} else {
av_log(avctx, AV_LOG_DEBUG, "sending empty sub\n");
sub->rects = NULL;
}
if (!sub->rects) // no rect was passed
- av_free(ctx->sub_rect);
- ctx->sub_rect = NULL;
+ subtitle_rect_free(&ctx->pages->sub_rect);
+
+ for (i = 0; i < ctx->nb_pages - 1; i++)
+ ctx->pages[i] = ctx->pages[i + 1];
+ ctx->nb_pages--;
- *data_size = 1;
+ if (ret >= 0)
+ *data_size = 1;
} else
*data_size = 0;
- return pkt->size;
+ return ret;
}
static int teletext_init_decoder(AVCodecContext *avctx)
ctx->dx = NULL;
ctx->vbi = NULL;
- ctx->sub_rect = NULL;
- if (!strcmp(ctx->format, "bitmap")) {
- ctx->format_id = 0;
- } else if (!strcmp(ctx->format, "text")) {
- ctx->format_id = 1;
- } else {
- av_log(avctx, AV_LOG_ERROR, "unkown format %s\n", ctx->format);
- return AVERROR_OPTION_NOT_FOUND;
- }
+ ctx->pts = AV_NOPTS_VALUE;
#ifdef DEBUG
{
}
#endif
av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
- return 0;
+ return (ctx->format_id == 1) ? ff_ass_subtitle_header_default(avctx) : 0;
}
static int teletext_close_decoder(AVCodecContext *avctx)
#ifdef DEBUG
av_log(avctx, AV_LOG_DEBUG, "lines_total=%u\n", ctx->lines_processed);
#endif
+ while (ctx->nb_pages)
+ subtitle_rect_free(&ctx->pages[--ctx->nb_pages].sub_rect);
+ av_freep(&ctx->pages);
vbi_dvb_demux_delete(ctx->dx);
vbi_decoder_delete(ctx->vbi);
ctx->dx = NULL;
ctx->vbi = NULL;
+ ctx->pts = AV_NOPTS_VALUE;
return 0;
}
static const AVOption options[] = {
{"txt_page", "list of teletext page numbers to decode, * is all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, SD},
{"txt_chop_top", "discards the top teletext line", OFFSET(chop_top), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
- {"txt_format", "format of the subtitles (bitmap or text)", OFFSET(format), AV_OPT_TYPE_STRING, {.str = "bitmap"}, 0, 0, SD},
+ {"txt_format", "format of the subtitles (bitmap or text)", OFFSET(format_id), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD, "txt_format"},
+ {"bitmap", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, SD, "txt_format"},
+ {"text", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, SD, "txt_format"},
{"txt_left", "x offset of generated bitmaps", OFFSET(x_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
{"txt_top", "y offset of generated bitmaps", OFFSET(y_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
{"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
.init = teletext_init_decoder,
.close = teletext_close_decoder,
.decode = teletext_decode_frame,
+ .capabilities = CODEC_CAP_DELAY,
.flush = teletext_flush,
.priv_class= &teletext_class,
};
projects / ffmpeg / blobdiff