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Code Issues Releases Activity

avcodec/cdgraphics: fix decoded output when seeking to start of file

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Also in cdg demuxer do not skip packets data, and remove
private context which is not really needed.
This commit is contained in:
Paul B Mahol
2020-09-10 00:39:47 +02:00
parent 55af1807f7
commit e1da139a33
2 changed files with 14 additions and 19 deletions
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23
libavformat/cdg.c
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@@ -26,10 +26,6 @@
#define CDG_COMMAND 0x09
#define CDG_MASK 0x3F
typedef struct CDGContext {
int got_first_packet;
} CDGContext;
static int read_header(AVFormatContext *s)
{
AVStream *vst;
@@ -56,26 +52,16 @@ static int read_header(AVFormatContext *s)
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
CDGContext *priv = s->priv_data;
int ret;
while (1) {
ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
if (ret < 1 || (pkt->data[0] & CDG_MASK) == CDG_COMMAND)
break;
av_packet_unref(pkt);
}
if (!priv->got_first_packet) {
pkt->flags |= AV_PKT_FLAG_KEY;
priv->got_first_packet = 1;
}
ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
pkt->stream_index = 0;
pkt->dts=
pkt->pts= pkt->pos / CDG_PACKET_SIZE;
if(ret>5 && (pkt->data[0]&0x3F) == 9 && (pkt->data[1]&0x3F)==1 && !(pkt->data[2+2+1] & 0x0F)){
if (!pkt->pos || (ret > 5 &&
(pkt->data[0] & CDG_MASK) == CDG_COMMAND &&
(pkt->data[1] & CDG_MASK) == 1 && !(pkt->data[2+2+1] & 0x0F))) {
pkt->flags = AV_PKT_FLAG_KEY;
}
return ret;
@@ -84,7 +70,6 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
AVInputFormat ff_cdg_demuxer = {
.name = "cdg",
.long_name = NULL_IF_CONFIG_SMALL("CD Graphics"),
.priv_data_size = sizeof(CDGContext),
.read_header = read_header,
.read_packet = read_packet,
.flags = AVFMT_GENERIC_INDEX,