[FFmpeg-devel] [PATCH 1/2] movtextdec.c: Improve upon dynarrays and text_to_ass
Philip Langdale
philipl at overt.org
Sat Jun 20 19:52:16 CEST 2015
On Thu, 18 Jun 2015 22:26:52 +0530
Niklesh Lalwani <niklesh.lalwani at iitb.ac.in> wrote:
> Updated patch attached.
>
> On 18-Jun-2015 2:52 PM, "Clément Bœsch" <u at pkh.me> wrote:
> av_dynarray_add(&style_flags, &index, flag);
> > > + s_temp->style_flag = AV_RB8(tsmb);
> > > + count = i;
> >
> > > + av_dynarray_add(&s, &count, s_temp);
> >
> > missing check
> >
> > (make sure not to leak anything if you return in the middle)
> >
>
> Is this the right way to implement it?
> From c3eb7447e0b120a459d68c5bc570dec2b945c4c1 Mon Sep 17 00:00:00 2001
> From: Niklesh <niklesh.lalwani at iitb.ac.in>
> Date: Thu, 18 Jun 2015 22:04:33 +0530
> Subject: [PATCH 1/2] movtextdec.c: Improve upon dynarrays and
> text_to_ass
>
> Signed-off-by: Niklesh <niklesh.lalwani at iitb.ac.in>
> ---
> libavcodec/movtextdec.c | 100
> ++++++++++++++++++++++++++---------------------- 1 file changed, 55
> insertions(+), 45 deletions(-)
>
> diff --git a/libavcodec/movtextdec.c b/libavcodec/movtextdec.c
> index 8dda5ce..23c7a7e 100644
> --- a/libavcodec/movtextdec.c
> +++ b/libavcodec/movtextdec.c
> @@ -27,23 +27,40 @@
> #include "libavutil/intreadwrite.h"
> #include "libavutil/mem.h"
>
> -#define STYLE_FLAG_BOLD 1
> -#define STYLE_FLAG_ITALIC 2
> -#define STYLE_FLAG_UNDERLINE 4
> +#define STYLE_FLAG_BOLD (1<<0)
> +#define STYLE_FLAG_ITALIC (1<<1)
> +#define STYLE_FLAG_UNDERLINE (1<<2)
> +
> +typedef struct {
> + uint16_t style_start;
> + uint16_t style_end;
> + uint8_t style_flag;
> +} StyleBox;
>
> static int text_to_ass(AVBPrint *buf, const char *text, const char
> *text_end,
> - char **style_start, char **style_end,
> - uint8_t **style_flags, int style_entries)
> + StyleBox **s, int style_entries)
> {
> int i = 0;
> + int text_pos = 0;
> while (text < text_end) {
> for (i = 0; i < style_entries; i++) {
> - if (*style_flags[i] && text == style_start[i]) {
> - if (*style_flags[i] & STYLE_FLAG_BOLD)
> + 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}");
> + }
> + }
> +
> + 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 (*style_flags[i] & STYLE_FLAG_ITALIC)
> + if (s[i]->style_flag & STYLE_FLAG_ITALIC)
> av_bprintf(buf, "{\\i1}");
> - if (*style_flags[i] & STYLE_FLAG_UNDERLINE)
> + if (s[i]->style_flag & STYLE_FLAG_UNDERLINE)
> av_bprintf(buf, "{\\u1}");
> }
> }
> @@ -58,18 +75,8 @@ static int text_to_ass(AVBPrint *buf, const char
> *text, const char *text_end, av_bprint_chars(buf, *text, 1);
> break;
> }
> -
> - for (i = 0; i < style_entries; i++) {
> - if (*style_flags[i] && text == style_end[i]) {
> - if (*style_flags[i] & STYLE_FLAG_BOLD)
> - av_bprintf(buf, "{\\b0}");
> - if (*style_flags[i] & STYLE_FLAG_ITALIC)
> - av_bprintf(buf, "{\\i0}");
> - if (*style_flags[i] & STYLE_FLAG_UNDERLINE)
> - av_bprintf(buf, "{\\u0}");
> - }
> - }
> text++;
> + text_pos++;
> }
>
> return 0;
> @@ -96,13 +103,10 @@ static int mov_text_decode_frame(AVCodecContext
> *avctx, //char *ptr_temp;
> int text_length, tsmb_type, style_entries;
> uint64_t tsmb_size, tracksize;
> - char **style_start = { 0, };
> - char **style_end = { 0, };
> - uint8_t **style_flags = { 0, };
> + StyleBox **s = {0, };
> + StyleBox *s_temp;
> const uint8_t *tsmb;
> - int index, i, size_var;
> - uint8_t *flag;
> - char *style_pos;
> + int count, i, size_var;
>
> if (!ptr || avpkt->size < 2)
> return AVERROR_INVALIDDATA;
> @@ -170,40 +174,37 @@ static int mov_text_decode_frame(AVCodecContext
> *avctx, break;
>
> for(i = 0; i < style_entries; i++) {
> - style_pos = ptr + AV_RB16(tsmb);
> - index = i;
> - av_dynarray_add(&style_start, &index, style_pos);
> + s_temp = av_malloc(sizeof(*s_temp));
> + if (!s_temp)
> + goto error;
> +
> + s_temp->style_start = AV_RB16(tsmb);
> tsmb += 2;
> - style_pos = ptr + AV_RB16(tsmb);
> - index = i;
> - av_dynarray_add(&style_end, &index, style_pos);
> + s_temp->style_end = AV_RB16(tsmb);
> tsmb += 2;
> // fontID = AV_RB16(tsmb);
> tsmb += 2;
> - flag = av_malloc(1);
> - if (!flag)
> - return AVERROR(ENOMEM);
> - *flag = AV_RB8(tsmb);
> - index = i;
> - av_dynarray_add(&style_flags, &index, flag);
> + s_temp->style_flag = AV_RB8(tsmb);
> + count = i;
> + av_dynarray_add(&s, &count, s_temp);
av_dynarray_add increments the count, so you don't need to set it to
'i'. You just need to intialize it to zero.
> + if(!s)
> + goto error;
> //fontsize=AV_RB8(tsmb);
> tsmb += 2;
> // text-color-rgba
> tsmb += 4;
> }
> - text_to_ass(&buf, ptr, end, style_start, style_end,
> style_flags, style_entries);
> + text_to_ass(&buf, ptr, end, s, style_entries);
>
> - for(i = 0; i < style_entries; i++) {
> - av_freep(&style_flags[i]);
> + for(i = 0; i < count; i++) {
> + av_freep(&s[i]);
> }
> - av_freep(&style_start);
> - av_freep(&style_end);
> - av_freep(&style_flags);
> + av_freep(&s);
> }
> tracksize = tracksize + tsmb_size;
> }
> } else
> - text_to_ass(&buf, ptr, end, NULL, NULL, 0, 0);
> + text_to_ass(&buf, ptr, end, NULL, 0);
>
> ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_end -
> ts_start); av_bprint_finalize(&buf, NULL);
> @@ -211,6 +212,15 @@ 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);
> + return AVERROR(ENOMEM);
> }
You also need to call av_bprint_finalize in this block.
> AVCodec ff_movtext_decoder = {
> --
> 1.9.1
>
--phil
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