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avformat/matroskaenc: Avoid dynamic buffer when writing Colour

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There is a good upper bound for the maximum length of the Colour master
element; it is therefore unnecessary to use a dynamic buffer for it.
A simple buffer on the stack is enough. This commit implements this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-04-29 20:22:40 +02:00
parent 851283a777
commit 3122dcf2fe
1 changed files with 12 additions and 14 deletions
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26
libavformat/matroskaenc.c
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@ -808,18 +808,19 @@ static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb,
return ret;
}
static int mkv_write_video_color(AVIOContext *pb, const AVCodecParameters *par,
static void mkv_write_video_color(AVIOContext *pb, const AVCodecParameters *par,
const AVStream *st)
{
AVIOContext *dyn_cp;
uint8_t *colorinfo_ptr;
/* 18 Elements with two bytes ID, one byte length field, 8 bytes payload
* a master element with two bytes ID and one byte length field
* plus another byte to stay clear of the end. */
uint8_t colour[(2 + 1 + 8) * 18 + (2 + 1) + 1];
AVIOContext buf, *dyn_cp = &buf;
int side_data_size = 0;
int ret, colorinfo_size;
int colorinfo_size;
const uint8_t *side_data;
ret = avio_open_dyn_buf(&dyn_cp);
if (ret < 0)
return ret;
ffio_init_context(dyn_cp, colour, sizeof(colour), 1, NULL, NULL, NULL, NULL);
if (par->color_trc != AVCOL_TRC_UNSPECIFIED &&
par->color_trc < AVCOL_TRC_NB) {
@ -890,14 +891,12 @@ static int mkv_write_video_color(AVIOContext *pb, const AVCodecParameters *par,
end_ebml_master(dyn_cp, meta_element);
}
colorinfo_size = avio_get_dyn_buf(dyn_cp, &colorinfo_ptr);
colorinfo_size = avio_tell(dyn_cp);
if (colorinfo_size) {
ebml_master colorinfo = start_ebml_master(pb, MATROSKA_ID_VIDEOCOLOR, colorinfo_size);
avio_write(pb, colorinfo_ptr, colorinfo_size);
avio_write(pb, colour, colorinfo_size);
end_ebml_master(pb, colorinfo);
}
ffio_free_dyn_buf(&dyn_cp);
return 0;
}
static int mkv_write_video_projection(AVFormatContext *s, AVIOContext *pb,
@ -1290,9 +1289,8 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
uint32_t color_space = av_le2ne32(par->codec_tag);
put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
}
ret = mkv_write_video_color(pb, par, st);
if (ret < 0)
return ret;
mkv_write_video_color(pb, par, st);
ret = mkv_write_video_projection(s, pb, st);
if (ret < 0)
return ret;