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dfa: support decoding version=1.0

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-04-15 12:07:12 +02:00
parent 1cb02d4fbc
commit 1557f34b10
2 changed files with 20 additions and 3 deletions
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13
libavcodec/dfa.c
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@ -340,6 +340,7 @@ static int dfa_decode_frame(AVCodecContext *avctx,
uint8_t *dst;
int ret;
int i, pal_elems;
int version = avctx->extradata_size==2 ? AV_RL16(avctx->extradata) : 0;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
@ -374,9 +375,17 @@ static int dfa_decode_frame(AVCodecContext *avctx,
buf = s->frame_buf;
dst = frame->data[0];
for (i = 0; i < avctx->height; i++) {
memcpy(dst, buf, avctx->width);
if(version == 0x100) {
int j;
for(j = 0; j < avctx->width; j++) {
dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) +
((j&3)*(avctx->height/4) + (i/4))*avctx->width];
}
} else {
memcpy(dst, buf, avctx->width);
buf += avctx->width;
}
dst += frame->linesize[0];
buf += avctx->width;
}
memcpy(frame->data[1], s->pal, sizeof(s->pal));

10
libavformat/dfa.c
View File

@ -36,13 +36,15 @@ static int dfa_read_header(AVFormatContext *s)
AVIOContext *pb = s->pb;
AVStream *st;
int frames;
int version;
uint32_t mspf;
if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
return AVERROR_INVALIDDATA;
}
avio_skip(pb, 2); // unused
version = avio_rl16(pb);
frames = avio_rl16(pb);
st = avformat_new_stream(s, NULL);
@ -62,6 +64,12 @@ static int dfa_read_header(AVFormatContext *s)
avio_skip(pb, 128 - 16); // padding
st->duration = frames;
st->codec->extradata = av_malloc(2);
st->codec->extradata_size = 2;
AV_WL16(st->codec->extradata, version);
if (version == 0x100)
st->sample_aspect_ratio = (AVRational){2, 1};
return 0;
}