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avformat/bethsoftvid: Avoid allocations and frees for palettes

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by putting the palette in the demuxer's context. This also allows to
remove this demuxer's read_close-function.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Andreas Rheinhardt 2020-03-21 04:30:27 +01:00 committed by Michael Niedermayer
parent ea46b45e9c
commit 6e14ddd156
1 changed files with 7 additions and 18 deletions
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25
libavformat/bethsoftvid.c
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@ -49,7 +49,8 @@ typedef struct BVID_DemuxContext
int bethsoft_global_delay;
int video_index; /**< video stream index */
int audio_index; /**< audio stream index */
uint8_t *palette;
int has_palette;
uint8_t palette[BVID_PALETTE_SIZE];
int is_finished;
@ -188,7 +189,7 @@ static int read_frame(BVID_DemuxContext *vid, AVIOContext *pb, AVPacket *pkt,
pkt->flags |= AV_PKT_FLAG_KEY;
/* if there is a new palette available, add it to packet side data */
if (vid->palette) {
if (vid->has_palette) {
uint8_t *pdata = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
BVID_PALETTE_SIZE);
if (!pdata) {
@ -197,8 +198,7 @@ static int read_frame(BVID_DemuxContext *vid, AVIOContext *pb, AVPacket *pkt,
goto fail;
}
memcpy(pdata, vid->palette, BVID_PALETTE_SIZE);
av_freep(&vid->palette);
vid->has_palette = 0;
}
vid->nframes--; // used to check if all the frames were read
@ -222,17 +222,14 @@ static int vid_read_packet(AVFormatContext *s,
block_type = avio_r8(pb);
switch(block_type){
case PALETTE_BLOCK:
if (vid->palette) {
if (vid->has_palette) {
av_log(s, AV_LOG_WARNING, "discarding unused palette\n");
av_freep(&vid->palette);
vid->has_palette = 0;
}
vid->palette = av_malloc(BVID_PALETTE_SIZE);
if (!vid->palette)
return AVERROR(ENOMEM);
if (avio_read(pb, vid->palette, BVID_PALETTE_SIZE) != BVID_PALETTE_SIZE) {
av_freep(&vid->palette);
return AVERROR(EIO);
}
vid->has_palette = 1;
return vid_read_packet(s, pkt);
case FIRST_AUDIO_BLOCK:
@ -284,13 +281,6 @@ static int vid_read_packet(AVFormatContext *s,
}
}
static int vid_read_close(AVFormatContext *s)
{
BVID_DemuxContext *vid = s->priv_data;
av_freep(&vid->palette);
return 0;
}
AVInputFormat ff_bethsoftvid_demuxer = {
.name = "bethsoftvid",
.long_name = NULL_IF_CONFIG_SMALL("Bethesda Softworks VID"),
@ -298,5 +288,4 @@ AVInputFormat ff_bethsoftvid_demuxer = {
.read_probe = vid_probe,
.read_header = vid_read_header,
.read_packet = vid_read_packet,
.read_close = vid_read_close,
};