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avcodec/srtdec: use AVBPrint API

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This commit is contained in:
Clément Bœsch 2014-09-28 11:57:46 +02:00
parent 55180b3299
commit 0eb4a42812
1 changed files with 35 additions and 43 deletions
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78
libavcodec/srtdec.c
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@ -47,8 +47,14 @@ typedef struct {
char param[PARAM_NUMBER][128];
} SrtStack;
static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
const char *in, int x1, int y1, int x2, int y2)
static void rstrip_spaces_buf(AVBPrint *buf)
{
while (buf->len > 0 && buf->str[buf->len - 1] == ' ')
buf->str[--buf->len] = 0;
}
static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst,
const char *in, int x1, int y1, int x2, int y2)
{
char *param, buffer[128], tmp[128];
int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
@ -61,14 +67,12 @@ static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
if (x1 >= 0 && y1 >= 0) {
if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1))
snprintf(out, out_end-out,
"{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2);
av_bprintf(dst, "{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2);
else
snprintf(out, out_end-out, "{\\an1}{\\pos(%d,%d)}", x1, y1);
out += strlen(out);
av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", x1, y1);
}
for (; out < out_end && !end && *in; in++) {
for (; !end && *in; in++) {
switch (*in) {
case '\r':
break;
@ -77,15 +81,13 @@ static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
end = 1;
break;
}
while (out[-1] == ' ')
out--;
snprintf(out, out_end-out, "\\N");
if(out<out_end) out += strlen(out);
rstrip_spaces_buf(dst);
av_bprintf(dst, "\\N");
line_start = 1;
break;
case ' ':
if (!line_start)
*out++ = *in;
av_bprint_chars(dst, *in, 1);
break;
case '{': /* skip all {\xxx} substrings except for {\an%d}
and all microdvd like styles such as {Y:xxx} */
@ -95,7 +97,7 @@ static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
(len = 0, sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n", &len) >= 0 && len > 0)) {
in += len - 1;
} else
*out++ = *in;
av_bprint_chars(dst, *in, 1);
break;
case '<':
tag_close = in[1] == '/';
@ -115,9 +117,7 @@ static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
if (stack[sptr-1].param[i][0])
for (j=sptr-2; j>=0; j--)
if (stack[j].param[i][0]) {
snprintf(out, out_end-out,
"%s", stack[j].param[i]);
if(out<out_end) out += strlen(out);
av_bprintf(dst, "%s", stack[j].param[i]);
break;
}
} else {
@ -151,16 +151,11 @@ static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
param++;
}
for (i=0; i<PARAM_NUMBER; i++)
if (stack[sptr].param[i][0]) {
snprintf(out, out_end-out,
"%s", stack[sptr].param[i]);
if(out<out_end) out += strlen(out);
}
if (stack[sptr].param[i][0])
av_bprintf(dst, "%s", stack[sptr].param[i]);
}
} else if (!buffer[1] && strspn(buffer, "bisu") == 1) {
snprintf(out, out_end-out,
"{\\%c%d}", buffer[0], !tag_close);
if(out<out_end) out += strlen(out);
av_bprintf(dst, "{\\%c%d}", buffer[0], !tag_close);
} else {
unknown = 1;
snprintf(tmp, sizeof(tmp), "</%s>", buffer);
@ -169,7 +164,7 @@ static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
sptr--;
} else if (unknown && !strstr(in, tmp)) {
in -= len + tag_close;
*out++ = *in;
av_bprint_chars(dst, *in, 1);
} else
av_strlcpy(stack[sptr++].tag, buffer,
sizeof(stack[0].tag));
@ -177,30 +172,26 @@ static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
}
}
default:
*out++ = *in;
av_bprint_chars(dst, *in, 1);
break;
}
if (*in != ' ' && *in != '\r' && *in != '\n')
line_start = 0;
}
out = FFMIN(out, out_end-3);
while (!strncmp(out-2, "\\N", 2))
out -= 2;
while (out[-1] == ' ')
out--;
snprintf(out, out_end-out, "\r\n");
return in;
while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2))
dst->len -= 2;
dst->str[dst->len] = 0;
rstrip_spaces_buf(dst);
av_bprintf(dst, "\r\n");
}
static int srt_decode_frame(AVCodecContext *avctx,
void *data, int *got_sub_ptr, AVPacket *avpkt)
{
AVSubtitle *sub = data;
AVBPrint buffer;
int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
char buffer[2048];
const char *ptr = avpkt->data;
const char *end = avpkt->data + avpkt->size;
int size, ret;
const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
@ -214,7 +205,8 @@ static int srt_decode_frame(AVCodecContext *avctx,
if (avpkt->size <= 0)
return avpkt->size;
while (ptr < end && *ptr) {
av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
// TODO: reindent
// Do final divide-by-10 outside rescale to force rounding down.
ts_start = av_rescale_q(avpkt->pts,
@ -223,12 +215,12 @@ static int srt_decode_frame(AVCodecContext *avctx,
ts_end = av_rescale_q(avpkt->pts + avpkt->duration,
avctx->time_base,
(AVRational){1,100});
ptr = srt_to_ass(avctx, buffer, buffer+sizeof(buffer), ptr,
x1, y1, x2, y2);
ret = ff_ass_add_rect(sub, buffer, ts_start, ts_end-ts_start, 0);
if (ret < 0)
return ret;
}
srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2);
ret = ff_ass_add_rect_bprint(sub, &buffer, ts_start, ts_end-ts_start, 0);
av_bprint_finalize(&buffer, NULL);
if (ret < 0)
return ret;
*got_sub_ptr = sub->num_rects > 0;
return avpkt->size;