---
libavformat/mov.c | 40 +++++++++++++++++++++++++++++++---------
1 file changed, 31 insertions(+), 9 deletions(-)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 85aef33b19..422e515fe8 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -10790,22 +10790,44 @@ static int mov_change_extradata(AVStream *st,
AVPacket *pkt)
static int get_eia608_packet(AVIOContext *pb, AVPacket *pkt, int size)
{
- int new_size, ret;
-
+ /* We can't make assumptions about the structure of the payload,
+ because it may include multiple cdat and cdt2 samples. */
+ int ret, out_size = 0;
if (size <= 8)
return AVERROR_INVALIDDATA;
- new_size = ((size - 8) / 2) * 3;
- ret = av_new_packet(pkt, new_size);
+
+ /* Allocate 3 times the required buffer size to give us enough space
+ to store the original c608 packet and (potentially 3/2 times larger)
+ reformatted data, safely. */
+ ret = av_new_packet(pkt, size * 3);
if (ret < 0)
return ret;
- avio_skip(pb, 8);
- for (int j = 0; j < new_size; j += 3) {
- pkt->data[j] = 0xFC;
- pkt->data[j+1] = avio_r8(pb);
- pkt->data[j+2] = avio_r8(pb);
+ /* Load the original c608 payload into the last 3rd of the buffer. */
+ if (avio_read(pb, pkt->data + size * 2, size) != size)
+ return AVERROR_EOF;
+
+ /* parse and re-format the c608 payload in one pass */
+ for (uint8_t *out = pkt->data, *src = out + size * 2, *end = src + size;
src + 8 <= end; ) {
+ uint32_t atom_size = AV_RB32(src);
+ uint8_t cc_field =
+ memcmp(src + 4, "cdat", 4) == 0 ? 1 :
+ memcmp(src + 4, "cdt2", 4) == 0 ? 2 :
+ 0;
+
+ if (cc_field != 0) {
+ for (uint8_t *cc = src + 8, *cc_end = src + atom_size; cc <
cc_end; cc += 2) {
+ out[0] = (0x1F << 3) | (1 << 2) | (cc_field - 1);
+ out[1] = cc[0];
+ out[2] = cc[1];
+ out_size += 3;
+ out += 3;
+ }
+ }
+ src += atom_size;
}
+ pkt->size = out_size;
return 0;
}
--
2.43.0
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