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avcodec/mpeg4_unpack_bframes: make sure the packet is writable when data needs to be changed

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Nothing currently guarantees that the packet passed to the bsf will
be writable.

Based on commit 4f2ff3a53e170d77e1dd231d7246a74e186011c9

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2018-03-28 01:42:33 -03:00
parent a45ba0881c
commit 1b9b469cdb
1 changed files with 9 additions and 1 deletions
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10
libavcodec/mpeg4_unpack_bframes_bsf.c
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@ -152,8 +152,16 @@ static int mpeg4_unpack_bframes_filter(AVBSFContext *ctx, AVPacket *out)
av_packet_move_ref(out, in);
out->size = pos_vop2;
} else if (pos_p >= 0) {
ret = av_new_packet(out, in->size);
if (ret < 0)
return ret;
ret = av_packet_copy_props(out, in);
if (ret < 0) {
av_packet_unref(out);
return ret;
}
memcpy(out->data, in->data, in->size);
av_log(ctx, AV_LOG_DEBUG, "Updating DivX userdata (remove trailing 'p').\n");
av_packet_move_ref(out, in);
/* remove 'p' (packed) from the end of the (DivX) userdata string */
out->data[pos_p] = '\0';
} else {