This time i modified the initial buffer at the time of reading header
instead of changing the IO layer.
Suggest any changes required.
>From 277a4267f8cbb68c5fa57a0bddd215e04ca662bd Mon Sep 17 00:00:00 2001
From: Shivam Goyal <shi...@iitk.ac.in>
Date: Sun, 7 Apr 2019 12:13:21 +0530
Subject: [PATCH] Added XV Support
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/flvdec.c | 87 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 89 insertions(+)
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 99be60d184..262df876e9 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -563,6 +563,7 @@ OBJS-$(CONFIG_XBIN_DEMUXER) += bintext.o sauce.o
OBJS-$(CONFIG_XMV_DEMUXER) += xmv.o
OBJS-$(CONFIG_XVAG_DEMUXER) += xvag.o
OBJS-$(CONFIG_XWMA_DEMUXER) += xwma.o
+OBJS-$(CONFIG_XV_DEMUXER) += flvdec.o
OBJS-$(CONFIG_YOP_DEMUXER) += yop.o
OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER) += yuv4mpegdec.o
OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER) += yuv4mpegenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index d316a0529a..b499186071 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -456,6 +456,7 @@ extern AVOutputFormat ff_wv_muxer;
extern AVInputFormat ff_xa_demuxer;
extern AVInputFormat ff_xbin_demuxer;
extern AVInputFormat ff_xmv_demuxer;
+extern AVInputFormat ff_xv_demuxer;
extern AVInputFormat ff_xvag_demuxer;
extern AVInputFormat ff_xwma_demuxer;
extern AVInputFormat ff_yop_demuxer;
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index b531a39adc..df732ca65e 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -127,6 +127,19 @@ static int kux_probe(const AVProbeData *p)
return 0;
}
+static int xv_probe(const AVProbeData *p)
+{
+ const uint8_t *d = p->buf;
+
+ if (d[0] == 'X' &&
+ d[1] == 'L' &&
+ d[2] == 'V' &&
+ d[3] == 'F') {
+ return AVPROBE_SCORE_MAX;
+ }
+ return 0;
+}
+
static void add_keyframes_index(AVFormatContext *s)
{
FLVContext *flv = s->priv_data;
@@ -459,6 +472,13 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t m
}
}
+ // For XV file the flv data starts from 0x200000 byte
+ if(!strcmp(s->iformat->name , "xv")){
+ for (i=0; i < FFMIN(2,fileposlen); i++){
+ filepositions[i] += 0x200000;
+ }
+ }
+
if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
for (i = 0; i < FFMIN(2,fileposlen); i++) {
flv->validate_index[i].pos = filepositions[i];
@@ -783,6 +803,52 @@ static int flv_read_header(AVFormatContext *s)
return 0;
}
+static int xv_read_header(AVFormatContext *s)
+{
+ int flags;
+ FLVContext *xv = s->priv_data;
+ AVIOContext *ic = s->pb;
+ int offset;
+ int pre_tag_size = 0;
+ int rot;
+
+ //Find the rot value for rotating the bytes
+ avio_seek(ic, 0x200000, SEEK_SET);
+ rot = 0x46 - avio_r8(ic);
+
+ avio_skip(ic, 3);
+
+ flags = (avio_r8(ic) + rot ) & 0xff;
+
+ xv->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);
+
+ s->ctx_flags |= AVFMTCTX_NOHEADER;
+
+ offset = ((((avio_r8(ic) + rot)&0xff)<<24) |
+ (((avio_r8(ic) + rot)&0xff)<<16) |
+ (((avio_r8(ic) + rot)&0xff)<<8) |
+ (((avio_r8(ic) + rot)&0xff)))+ 0x200000;
+
+ avio_seek(ic, offset + 4, SEEK_SET);
+
+
+ // Will modify the current buffer, as only
+ // the bytes from 0x200000 to 0x200400 are needed to decode
+ int size = ic->buf_end - ic->buf_ptr;
+ int64_t pos = ic->pos - size;
+ for(int i=0;i<0x400; i++){
+ if(pos >= 0x200400) break;
+ (*(ic->buf_ptr + i)) = (((*(ic->buf_ptr + i)) + rot) & 0xff );
+ pos+=1;
+ }
+
+ s->start_time = 0;
+ xv->sum_flv_tag_size = 0;
+ xv->last_keyframe_stream_index = -1;
+
+ return 0;
+}
+
static int flv_read_close(AVFormatContext *s)
{
int i;
@@ -1424,3 +1490,24 @@ AVInputFormat ff_kux_demuxer = {
.extensions = "kux",
.priv_class = &kux_class,
};
+
+static const AVClass xv_class = {
+ .class_name = "xvdec",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_xv_demuxer = {
+ .name = "xv",
+ .long_name = NULL_IF_CONFIG_SMALL("Xunlie Video File"),
+ .priv_data_size = sizeof(FLVContext),
+ .read_probe = xv_probe,
+ .read_header = xv_read_header,
+ .read_packet = flv_read_packet,
+ .read_seek = flv_read_seek,
+ .read_close = flv_read_close,
+ .extensions = "xv",
+ .priv_class = &xv_class,
+ .flags = AVFMT_TS_DISCONT
+};
--
2.21.0
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