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avformat/flvenc: refine the flvenc shift_data code

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refine the flvenc shift_data move data option

Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
This commit is contained in:
Steven Liu
2017-01-24 12:31:36 +08:00
parent 2f7cc21b61
commit 1bb192ef6c
1 changed files with 7 additions and 5 deletions
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12
libavformat/flvenc.c
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@@ -626,13 +626,15 @@ static int shift_data(AVFormatContext *s)
avio_seek(read_pb, flv->keyframes_info_offset, SEEK_SET);
pos = avio_tell(read_pb);
/* shift data by chunk of at most keyframe *filepositions* and *times* size */
#define READ_BLOCK do { \
read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
read_buf_id ^= 1;
do {
read_buf_id ^= 1; \
} while (0)
read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
read_buf_id ^= 1;
/* shift data by chunk of at most keyframe *filepositions* and *times* size */
READ_BLOCK;
do {
READ_BLOCK;
n = read_size[read_buf_id];
if (n < 0)
break;